Struct cdx::column::ColumnSet [−][src]
pub struct ColumnSet { /* fields omitted */ }Expand description
A column set is a collection of column specifictions, which when interpreted in the context of a set of named columns, produces a list of column numbers It contains a bunch of “yes” specs and “no” specs. If there are no “yes” specs, all columns are marked “yes” The resulting list of column numbers is all of the “yes” columns in order, minus any “no” columns. Thus if a column appears in both, it will be excluded.
Examples
use cdx::column::ColumnSet;
let header: [&str; 5] = ["zero", "one", "two", "three", "four"];
let mut s = ColumnSet::new();
s.lookup(&header);
assert_eq!(s.get_cols_num(), &[0,1,2,3,4]);
let mut s = ColumnSet::new();
s.add_yes("-");
s.lookup(&header);
assert_eq!(s.get_cols_num(), &[0,1,2,3,4]);
let mut s = ColumnSet::new();
s.add_yes("one-three");
s.lookup(&header);
assert_eq!(s.get_cols_num(), &[1,2,3]);
let mut s = ColumnSet::new();
s.add_no("three,one");
s.lookup(&header);
assert_eq!(s.get_cols_num(), &[0,2,4]);
let mut s = ColumnSet::new();
s.add_no("+4-+2");
s.lookup(&header);
assert_eq!(s.get_cols_num(), &[0,4]);
let mut s = ColumnSet::new();
s.add_yes(">s<=two");
s.lookup(&header);
assert_eq!(s.get_cols_num(), &[2,3]);Implementations
Create an empty column set, which selects all columns.
Examples found in repository
src/column.rs (line 457)
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pub fn ranges(fieldnames: &[&str], rng: &str) -> Result<Vec<OutCol>> {
let mut c = ColumnSet::new();
c.add_yes(rng);
c.lookup(fieldnames)?;
Ok(c.get_cols_full())
}
/// turn range into list of column numbers
fn range(fieldnames: &[&str], rng: &str) -> Result<Vec<OutCol>> {
if rng.is_empty() {
return err!("Empty Range {}", rng);
}
let (name, range) = match rng.split_once(':') {
None => ("", rng),
Some(x) => x,
};
let ch = range.chars().next().unwrap();
if ch == '<' || ch == '>' || ch == '=' {
return Ok(Self::to_outcols(
&Self::text_range(fieldnames, range)?,
name,
));
}
if range.contains('*') || rng.contains('?') {
return Ok(Self::to_outcols(
&Self::glob_range(fieldnames, range)?,
name,
));
}
let mut parts: Vec<&str> = range.split('-').collect();
if parts.len() > 2 {
return err!("Malformed Range {}", rng);
}
if parts[0].is_empty() {
parts[0] = "1";
}
let start: usize;
let end: usize;
if parts.len() == 1 {
start = Self::single(fieldnames, parts[0])?;
end = start;
} else {
if parts[1].is_empty() {
parts[1] = "+1";
}
start = Self::single(fieldnames, parts[0])?;
end = Self::single(fieldnames, parts[1])?;
}
if start > end {
// throw new CdxException("start > end, i.e. {" + parts.get(0) + " > " + parts.get(1));
return err!("Start greater than end : {}", rng);
}
let mut res = Vec::new();
for i in start..=end {
res.push(OutCol::new(i, name));
}
Ok(res)
}
/// resolve `ColumnSet` in context of the column names from an input file
/// # Examples
///
/// ```
/// use cdx::column::ColumnSet;
/// let header: [&str; 5] = ["zero", "one", "two", "three", "four"];
/// let mut s = ColumnSet::new();
/// s.add_no("two");
/// s.lookup(&header);
/// assert_eq!(s.get_cols_num(), &[0,1,3,4]);
/// ```
pub fn lookup(&mut self, fieldnames: &[&str]) -> Result<()> {
self.did_lookup = true;
self.columns = Vec::new();
let mut no_cols: HashSet<usize> = HashSet::new();
for s in &self.neg {
for x in Self::range(fieldnames, s)? {
no_cols.insert(x.num);
}
}
if self.pos.is_empty() {
for x in 0..fieldnames.len() {
if !no_cols.contains(&x) {
self.columns.push(OutCol::from_num(x));
}
}
} else {
for s in &self.pos {
for x in Self::range(fieldnames, s)? {
if !no_cols.contains(&x.num) {
self.columns.push(x);
}
}
}
}
Ok(())
}
/// Select columns from input line based on `ColumnSet`. Fail if input is too short. """
/// # Examples
///
/// ```
/// use cdx::column::ColumnSet;
/// let header: [&str; 5] = ["zero", "one", "two", "three", "four"];
/// let mut s = ColumnSet::new();
/// s.add_no("two");
/// s.lookup(&header);
/// let v = ["Zeroth", "First", "Second", "Third", "Fourth", "Fifth"];
/// let mut res = Vec::new();
/// s.select(&v, &mut res);
/// assert_eq!(res, vec!["Zeroth", "First", "Third", "Fourth"]);
/// ```
pub fn select<T: AsRef<str> + Clone>(&self, cols: &[T], result: &mut Vec<T>) -> Result<()> {
if !self.did_lookup {
return Err(Error::NeedLookup);
}
result.clear();
for x in &self.columns {
if x.num < cols.len() {
result.push(cols[x.num].clone());
} else {
return err!(
"Line has only {} columns, but column {} was requested.",
cols.len(),
x.num + 1
);
}
}
Ok(())
}
/// write the appropriate selection from the given columns
/// trying to write a non-existant column is an error
pub fn write(&self, w: &mut dyn Write, cols: &[&str], delim: &str) -> Result<()> {
if !self.did_lookup {
return Err(Error::NeedLookup);
}
let mut iter = self.columns.iter();
match iter.next() {
None => {}
Some(first) => {
w.write_all(cols[first.num].as_bytes())?;
for x in iter {
w.write_all(delim.as_bytes())?;
if x.num < cols.len() {
w.write_all(cols[x.num].as_bytes())?;
} else {
return err!(
"Line has only {} columns, but column {} was requested.",
cols.len(),
x.num + 1
);
}
}
}
};
w.write_all(&[b'\n'])?;
Ok(())
}
/// write the appropriate selection from the given columns
pub fn write2(&self, w: &mut dyn Write, cols: &TextLine, delim: u8) -> Result<()> {
if !self.did_lookup {
return Err(Error::NeedLookup);
}
let mut iter = self.columns.iter();
match iter.next() {
None => {}
Some(first) => {
w.write_all(&cols[first.num])?;
for x in iter {
w.write_all(&[delim])?;
w.write_all(cols.get(x.num))?;
}
}
};
w.write_all(&[b'\n'])?;
Ok(())
}
/// write the appropriate selection from the given columns, but no trailing newline
pub fn write3(&self, w: &mut dyn Write, cols: &TextLine, delim: u8) -> Result<()> {
if !self.did_lookup {
return Err(Error::NeedLookup);
}
let mut iter = self.columns.iter();
match iter.next() {
None => {}
Some(first) => {
w.write_all(cols.get(first.num))?;
for x in iter {
w.write_all(&[delim])?;
w.write_all(cols.get(x.num))?;
}
}
};
Ok(())
}
/// write the appropriate selection from the given columns, but no trailing newline
pub fn write3s(&self, w: &mut dyn Write, cols: &StringLine, delim: u8) -> Result<()> {
if !self.did_lookup {
return Err(Error::NeedLookup);
}
let mut iter = self.columns.iter();
match iter.next() {
None => {}
Some(first) => {
w.write_all(cols.get(first.num).as_bytes())?;
for x in iter {
w.write_all(&[delim])?;
w.write_all(cols.get(x.num).as_bytes())?;
}
}
};
Ok(())
}
/// write the appropriate selection from the given columns, but no trailing newline
/// trying to write a non-existant column writes the provided default value
pub fn write_sloppy(&self, cols: &[&str], rest: &str, w: &mut dyn Write) -> Result<()> {
if !self.did_lookup {
return Err(Error::NeedLookup);
}
for x in &self.columns {
if x.num < cols.len() {
w.write_all(cols[x.num].as_bytes())?;
} else {
w.write_all(rest.as_bytes())?;
}
}
Ok(())
}
/// Select columns from input line based on `ColumnSet`, fill in default if line is too short """
/// # Examples
///
/// ```
/// use cdx::column::ColumnSet;
/// let header: [&str; 5] = ["zero", "one", "two", "three", "four"];
/// let mut s = ColumnSet::new();
/// s.add_no("two");
/// s.lookup(&header);
/// let v = ["Zeroth", "First", "Second", "Third"];
/// let mut res = Vec::new();
/// s.select_sloppy(&v, &"extra", &mut res);
/// assert_eq!(res, vec!["Zeroth", "First", "Third", "extra"]);
/// ```
pub fn select_sloppy<T: AsRef<str> + Clone>(
&self,
cols: &[T],
restval: &T,
result: &mut Vec<T>,
) -> Result<()> {
if !self.did_lookup {
return Err(Error::NeedLookup);
}
result.clear();
for x in &self.columns {
if x.num < cols.len() {
result.push(cols[x.num].clone());
} else {
result.push(restval.clone());
}
}
Ok(())
}
/// return owned columns by const reference
pub fn get_cols(&self) -> &Vec<OutCol> {
&self.columns
}
/// steal owned columns by value
pub fn get_cols_full(self) -> Vec<OutCol> {
self.columns
}
/// get owned column numbers
pub fn get_cols_num(&self) -> Vec<usize> {
let mut v = Vec::with_capacity(self.columns.len());
for x in &self.columns {
v.push(x.num);
}
v
}
/// Shorthand to look up some columns
/// # Examples
///
/// ```
/// use cdx::column::ColumnSet;
/// let header: [&str; 5] = ["zero", "one", "two", "three", "four"];
/// assert_eq!(ColumnSet::lookup_cols("~2-3", &header).unwrap(), &[0,3,4]);
/// ```
pub fn lookup_cols(spec: &str, names: &[&str]) -> Result<Vec<usize>> {
let mut s = ColumnSet::new();
s.add_yes(spec);
s.lookup(names)?;
Ok(s.get_cols_num())
}
/// Shorthand to look up some columns, with names
pub fn lookup_cols_full(spec: &str, names: &[&str]) -> Result<Vec<OutCol>> {
let mut s = ColumnSet::new();
s.add_yes(spec);
s.lookup(names)?;
Ok(s.get_cols_full())
}
/// Shorthand to look up a single column
/// To look up a single named column, `lookup_col` is also available
/// # Examples
///
/// ```
/// use cdx::column::ColumnSet;
/// let header: [&str; 5] = ["zero", "one", "two", "three", "four"];
/// assert_eq!(ColumnSet::lookup1("three", &header).unwrap(), 3);
/// ```
pub fn lookup1(spec: &str, names: &[&str]) -> Result<usize> {
let mut s = ColumnSet::new();
s.add_yes(spec);
s.lookup(names)?;
if s.get_cols().len() != 1 {
return err!(
"Spec {} resolves to {} columns, rather than a single column",
spec,
s.get_cols().len()
);
}
Ok(s.get_cols_num()[0])
}
}
/// Write the columns with a custom delimiter
pub struct ColumnClump<'a> {
cols: Box<dyn ColumnFun + 'a>,
name: String,
delim: u8,
}
impl fmt::Debug for ColumnClump<'_> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "ColumnClump")
}
}
impl<'a> ColumnClump<'a> {
/// new ColumnClump from parts
pub fn new(cols: Box<dyn ColumnFun + 'a>, name: &str, delim: u8) -> Self {
Self {
cols,
name: name.to_string(),
delim,
}
}
/// new ColumnClump from spec : DelimOutcol:Columns
/// e.g. ,group:1-3
pub fn from_spec(orig_spec: &str) -> Result<Self> {
let mut spec = orig_spec;
if spec.is_empty() {
return err!("Can't construct a group from an empty string");
}
let delim = spec.take_first();
if delim.len_utf8() != 1 {
return err!("Delimiter must be a plain ascii character : {}", orig_spec);
}
let parts = spec.split_once(':');
if parts.is_none() {
return err!(
"No colon found. Group format is DelimOutname:Columns : {}",
orig_spec
);
}
let parts = parts.unwrap();
let mut g = ColumnSet::new();
g.add_yes(parts.1);
let cols = Box::new(ReaderColumns::new(g));
Ok(Self {
cols,
name: parts.0.to_string(),
delim: delim as u8,
})
}More examples
src/bin/cdx/join_main.rs (line 25)
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pub fn main(argv: &[String]) -> Result<()> {
let prog = args::ProgSpec::new("Join files on a matching column.", args::FileCount::Many);
const A: [ArgSpec; 4] = [
arg! {"also", "a", "FileNum,FileName", "Write non-matching lines from this file to this file."},
arg! {"file", "f", "OutputFile", "Output File Name, default '-' for stdout"},
arg! {"key", "k", "Spec", "How to compare lines"},
arg! {"output", "o", "Spec", "Output columns : file.ColumnSet,file.ColumnSet"},
];
let (args, files) = args::parse(&prog, &A, argv);
let mut config = JoinConfig::new();
config.infiles = files;
for x in args {
if x.name == "key" {
config.keys.push(x.value);
} else if x.name == "output" {
let mut file: Option<usize> = None;
let mut set = ColumnSet::new();
for y in x.value.split(',') {
let z = y.split_once('.');
if let Some((num, spec)) = z {
if !set.is_empty() {
config.out_cols.push(OutColSpec::new(file.unwrap(), set));
set = ColumnSet::new();
}
let fnum = num.parse::<usize>()?;
if fnum == 0 {
return err!("file number must be greater than zero {}", y);
}
file = Some(fnum - 1);
set.add_yes(spec);
} else {
if file.is_none() {
return err!(
"First part of output spec must start with 'file.' {}",
x.value
);
}
set.add_yes(y);
}
}
if !set.is_empty() {
config.out_cols.push(OutColSpec::new(file.unwrap(), set));
}
} else if x.name == "file" {
config.match_out = x.value;
} else if x.name == "also" {
let parts = x.value.split_once(',');
if let Some((a, b)) = parts {
config
.unmatch_out
.push(NoMatch::new(a.parse::<usize>()?, b));
} else {
return err!("--also format is FileNum,FileName {}", x.value);
}
} else {
unreachable!();
}
}
config.join()
}is empty?
Examples found in repository
src/bin/cdx/join_main.rs (line 29)
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pub fn main(argv: &[String]) -> Result<()> {
let prog = args::ProgSpec::new("Join files on a matching column.", args::FileCount::Many);
const A: [ArgSpec; 4] = [
arg! {"also", "a", "FileNum,FileName", "Write non-matching lines from this file to this file."},
arg! {"file", "f", "OutputFile", "Output File Name, default '-' for stdout"},
arg! {"key", "k", "Spec", "How to compare lines"},
arg! {"output", "o", "Spec", "Output columns : file.ColumnSet,file.ColumnSet"},
];
let (args, files) = args::parse(&prog, &A, argv);
let mut config = JoinConfig::new();
config.infiles = files;
for x in args {
if x.name == "key" {
config.keys.push(x.value);
} else if x.name == "output" {
let mut file: Option<usize> = None;
let mut set = ColumnSet::new();
for y in x.value.split(',') {
let z = y.split_once('.');
if let Some((num, spec)) = z {
if !set.is_empty() {
config.out_cols.push(OutColSpec::new(file.unwrap(), set));
set = ColumnSet::new();
}
let fnum = num.parse::<usize>()?;
if fnum == 0 {
return err!("file number must be greater than zero {}", y);
}
file = Some(fnum - 1);
set.add_yes(spec);
} else {
if file.is_none() {
return err!(
"First part of output spec must start with 'file.' {}",
x.value
);
}
set.add_yes(y);
}
}
if !set.is_empty() {
config.out_cols.push(OutColSpec::new(file.unwrap(), set));
}
} else if x.name == "file" {
config.match_out = x.value;
} else if x.name == "also" {
let parts = x.value.split_once(',');
if let Some((a, b)) = parts {
config
.unmatch_out
.push(NoMatch::new(a.parse::<usize>()?, b));
} else {
return err!("--also format is FileNum,FileName {}", x.value);
}
} else {
unreachable!();
}
}
config.join()
}Create an column set from a spec, e.g. “1-3”
Examples found in repository
src/bin/cdx/cut_main.rs (line 23)
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pub fn main(argv: &[String]) -> Result<()> {
let prog = args::ProgSpec::new("Select columns", args::FileCount::Many);
const A: [ArgSpec; 4] = [
arg! {"fields", "f", "Columns", "the columns to select."},
arg! {"group", "g", "Columns", "the columns in a bunch, e.g. '.group:1-3'"},
arg! {"composite", "c", "Spec", "new value made from parts. e.g. 'stuff:abc^{two}def'"},
arg_enum! {"header", "h", "Mode", "header requirements", &HEADER_MODE},
];
let (args, files) = args::parse(&prog, &A, argv);
let mut checker = HeaderChecker::new();
let mut v = Writer::new(b'\t');
for x in args {
if x.name == "header" {
checker.mode = HeaderMode::from_str(&x.value)?;
} else if x.name == "fields" {
v.push(Box::new(ReaderColumns::new(ColumnSet::from_spec(&x.value))));
} else if x.name == "group" {
v.push(Box::new(ColumnClump::from_spec(&x.value)?));
} else if x.name == "composite" {
v.push(Box::new(CompositeColumn::new(&x.value)?));
} else {
unreachable!();
}
}
if v.is_empty() {
return Err(Error::Error(
"cut requires at lease one --columns or --groups".to_string(),
));
}
let mut w = get_writer("-")?;
let mut not_header: Vec<u8> = Vec::new();
for x in &files {
let mut f = Reader::new();
f.open(x)?;
if f.is_empty() {
continue;
}
v.lookup(&f.names())?;
not_header.clear();
v.write_names(&mut not_header, f.header())?;
if checker.check(¬_header, x)? && f.cont.has_header {
w.write_all(¬_header)?;
}
if f.is_done() {
continue;
}
loop {
v.write(&mut w, f.curr())?;
if f.getline()? {
break;
}
}
}
Ok(())
}Add some columns to be selected
Examples found in repository
src/column.rs (line 132)
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pub fn new(spec: &str, del: char) -> Self {
let mut s = ScopedValue::default();
if spec.is_empty() {
return s;
}
let mut spec = spec;
let ch = spec.first();
if ch == del {
spec.skip_first();
if spec.is_empty() {
s.value.push(del);
return s;
}
let ch = spec.first();
if ch == del {
s.value.push(del);
}
}
while !spec.is_empty() {
let ch = spec.take_first();
if ch == del {
s.cols.add_yes(spec);
return s;
}
s.value.push(ch);
}
s
}
/// two strings
pub fn new2(value: &str, cols: &str) -> Self {
let mut s = ScopedValue::default();
s.cols.add_yes(cols);
s.value = value.to_string();
s
}
/// resolve named columns
pub fn lookup(&mut self, fieldnames: &[&str]) -> Result<()> {
self.cols.lookup(fieldnames)
}
}
/// A per-column value
#[derive(Debug, Clone, Default)]
pub struct ScopedValues {
default: String,
data: Vec<ScopedValue>,
has_value: Vec<bool>,
strings: Vec<String>,
ints: Vec<i64>,
floats: Vec<f64>,
}
impl ScopedValues {
/// new
pub fn new() -> Self {
ScopedValues::default()
}
/// value for column not otherwise assigned a value
pub fn set_default(&mut self, d: &str) {
self.default = d.to_string();
}
/// resolve named columns
pub fn lookup(&mut self, fieldnames: &[&str]) -> Result<()> {
self.has_value.clear();
self.has_value.resize(fieldnames.len(), false);
self.strings.clear();
self.strings.resize(fieldnames.len(), self.default.clone());
for x in &mut self.data {
x.lookup(fieldnames)?;
for i in 0..x.cols.columns.len() {
self.strings[i] = x.value.clone();
self.has_value[i] = true;
}
}
Ok(())
}
/// do the work so that get_int() will work properly
pub fn make_ints(&mut self) -> Result<()> {
self.ints.clear();
for i in 0..self.strings.len() {
self.ints[i] = self.get(i).parse::<i64>()?;
}
Ok(())
}
/// do the work so that get_int() will work properly
pub fn make_floats(&mut self) -> Result<()> {
self.floats.clear();
for i in 0..self.strings.len() {
self.floats[i] = self.get(i).parse::<f64>()?;
}
Ok(())
}
/// add one ScopedValue
pub fn add(&mut self, spec: &str, del: char) {
self.data.push(ScopedValue::new(spec, del));
}
/// add one ScopedValue
pub fn add2(&mut self, value: &str, cols: &str) {
self.data.push(ScopedValue::new2(value, cols));
}
/// get appropriate value for the column
pub fn get(&self, col: usize) -> &str {
if col < self.strings.len() {
&self.strings[col]
} else {
self.strings.last().unwrap()
}
}
/// get appropriate int value for the column
pub fn get_int(&self, col: usize) -> i64 {
if col < self.ints.len() {
self.ints[col]
} else {
*self.ints.last().unwrap()
}
}
/// get appropriate int value for the column
pub fn get_float(&self, col: usize) -> f64 {
if col < self.floats.len() {
self.floats[col]
} else {
*self.floats.last().unwrap()
}
}
/// has this column been assigned a value?
pub fn has_value(&self, col: usize) -> bool {
if col < self.has_value.len() {
self.has_value[col]
} else {
false
}
}
/// Have any column been assigned values?
pub fn is_empty(&self) -> bool {
self.data.is_empty()
}
}
/// Write some output
pub trait ColumnFun {
/// write the column names (called once)
fn write_names(&self, w: &mut dyn Write, head: &StringLine, delim: u8) -> Result<()>;
/// write the column values (called many times)
fn write(&self, w: &mut dyn Write, line: &TextLine, delim: u8) -> Result<()>;
/// resolve any named columns
fn lookup(&mut self, fieldnames: &[&str]) -> Result<()>;
}
impl fmt::Debug for dyn ColumnFun {
fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
write!(f, "ColumnFun")
}
}
impl ColumnSet {
/// Create an empty column set, which selects all columns.
pub fn new() -> Self {
ColumnSet::default()
}
/// is empty?
pub fn is_empty(&self) -> bool {
self.pos.is_empty() && self.neg.is_empty()
}
/// Create an column set from a spec, e.g. "1-3"
pub fn from_spec(spec: &str) -> Self {
let mut s = ColumnSet::default();
s.add_yes(spec);
s
}
/// Add some columns to be selected
pub fn add_yes(&mut self, spec: &str) {
self.add(spec, false);
}
/// Add some columns to be rejected.
pub fn add_no(&mut self, spec: &str) {
self.add(spec, true);
}
/// Add a spec, "yes" or "no" based on a flag.
pub fn add(&mut self, spec: &str, negate: bool) {
for s in spec.split(',') {
if let Some(stripped) = s.strip_prefix('~') {
let st = stripped.to_string();
if negate {
self.pos.push(st);
} else {
self.neg.push(st);
}
} else {
let st = s.to_string();
if negate {
self.neg.push(st);
} else {
self.pos.push(st);
}
}
}
}
/// Turn column name into column number
/// To also handle numbers and ranges, use `lookup1`
/// # Examples
///
/// ```
/// use cdx::column::ColumnSet;
/// assert_eq!(ColumnSet::lookup_col(&["zero", "one", "two"], "one").unwrap(), 1);
/// ```
pub fn lookup_col(fieldnames: &[&str], colname: &str) -> Result<usize> {
for f in fieldnames.iter().enumerate() {
if f.1 == &colname {
return Ok(f.0);
}
}
err!("{} not found", colname)
}
/*
/// turn a u8 column name into a column number
pub fn lookup_col2(fieldnames: &[&str], colname: &[u8]) -> Result<usize> {
let name = str::from_utf8_lossy(colname);
for f in fieldnames.iter().enumerate() {
if *f.1 == name {
return Ok(f.0);
}
}
err!("{:?} not found", &colname)
}
*/
/// resolve a single name or number into a column number
/// # Examples
///
/// ```
/// use cdx::column::ColumnSet;
/// assert_eq!(ColumnSet::single(&["zero", "one", "two"], "+1").unwrap(), 2);
/// ```
pub fn single(fieldnames: &[&str], colname: &str) -> Result<usize> {
if let Some(stripped) = colname.strip_prefix('+') {
let n = str_to_u_whole(stripped.as_bytes())? as usize;
let len = fieldnames.len();
if n > len {
err!("Column {} out of bounds", colname)
} else {
Ok(len - n)
}
} else {
let ch = colname.chars().next().unwrap();
if ch.is_ascii_digit() {
let n = str_to_u_whole(colname.as_bytes())? as usize;
if n < 1 {
err!("Column {} out of bounds", colname)
} else {
Ok(n - 1)
}
} else {
Self::lookup_col(fieldnames, colname)
}
}
}
/// determine if two strings match, given an operator
fn do_compare(left: &str, right: &str, operator: &str) -> Result<bool> {
let val = left.cmp(right);
if operator == "<" {
return Ok(val == Ordering::Less);
}
if operator == "<=" {
return Ok(val != Ordering::Greater);
}
if operator == ">" {
return Ok(val == Ordering::Greater);
}
if operator == ">=" {
return Ok(val != Ordering::Less);
}
err!(operator.to_string())
}
/// determine if a name is within a range
fn do_compare2(name: &str, key1: &str, op1: &str, key2: &str, op2: &str) -> Result<bool> {
Ok(Self::do_compare(name, key1, op1)? && Self::do_compare(name, key2, op2)?)
}
/// Return all the fields that match the glob
fn glob_range(fieldnames: &[&str], rng: &str) -> Result<Vec<usize>> {
let mut ret = Vec::new();
for f in fieldnames.iter().enumerate() {
if f.1.glob(rng, Case::Sens) {
// allow case insensitive?
ret.push(f.0);
}
}
Ok(ret)
}
/// Return all the field numbers that match a textual spec like <foo or <foo>bar """
fn text_range(fieldnames: &[&str], rng: &str) -> Result<Vec<usize>> {
let mut ret = Vec::new();
lazy_static! {
static ref RE1: Regex = Regex::new("^([<>]=?)([^<>]+)$").unwrap();
static ref RE2: Regex = Regex::new("^([<>]=?)([^<>]+)([<>]=?)([^<>]+)$").unwrap();
}
if let Some(caps) = RE1.captures(rng) {
for f in fieldnames.iter().enumerate() {
if Self::do_compare(
f.1,
caps.get(2).unwrap().as_str(),
caps.get(1).unwrap().as_str(),
)? {
ret.push(f.0);
}
}
return Ok(ret);
}
if let Some(caps) = RE2.captures(rng) {
for f in fieldnames.iter().enumerate() {
if Self::do_compare2(
f.1,
caps.get(2).unwrap().as_str(),
caps.get(1).unwrap().as_str(),
caps.get(4).unwrap().as_str(),
caps.get(3).unwrap().as_str(),
)? {
ret.push(f.0);
}
}
return Ok(ret);
}
err!("Malformed Range {}", rng)
}
fn to_outcols(data: &[usize], name: &str) -> Vec<OutCol> {
let mut ret = Vec::with_capacity(data.len());
for x in data {
ret.push(OutCol::new(*x, name));
}
ret
}
/// turn comma delimited list of ranges into list of possibly named column numbers
pub fn ranges(fieldnames: &[&str], rng: &str) -> Result<Vec<OutCol>> {
let mut c = ColumnSet::new();
c.add_yes(rng);
c.lookup(fieldnames)?;
Ok(c.get_cols_full())
}
/// turn range into list of column numbers
fn range(fieldnames: &[&str], rng: &str) -> Result<Vec<OutCol>> {
if rng.is_empty() {
return err!("Empty Range {}", rng);
}
let (name, range) = match rng.split_once(':') {
None => ("", rng),
Some(x) => x,
};
let ch = range.chars().next().unwrap();
if ch == '<' || ch == '>' || ch == '=' {
return Ok(Self::to_outcols(
&Self::text_range(fieldnames, range)?,
name,
));
}
if range.contains('*') || rng.contains('?') {
return Ok(Self::to_outcols(
&Self::glob_range(fieldnames, range)?,
name,
));
}
let mut parts: Vec<&str> = range.split('-').collect();
if parts.len() > 2 {
return err!("Malformed Range {}", rng);
}
if parts[0].is_empty() {
parts[0] = "1";
}
let start: usize;
let end: usize;
if parts.len() == 1 {
start = Self::single(fieldnames, parts[0])?;
end = start;
} else {
if parts[1].is_empty() {
parts[1] = "+1";
}
start = Self::single(fieldnames, parts[0])?;
end = Self::single(fieldnames, parts[1])?;
}
if start > end {
// throw new CdxException("start > end, i.e. {" + parts.get(0) + " > " + parts.get(1));
return err!("Start greater than end : {}", rng);
}
let mut res = Vec::new();
for i in start..=end {
res.push(OutCol::new(i, name));
}
Ok(res)
}
/// resolve `ColumnSet` in context of the column names from an input file
/// # Examples
///
/// ```
/// use cdx::column::ColumnSet;
/// let header: [&str; 5] = ["zero", "one", "two", "three", "four"];
/// let mut s = ColumnSet::new();
/// s.add_no("two");
/// s.lookup(&header);
/// assert_eq!(s.get_cols_num(), &[0,1,3,4]);
/// ```
pub fn lookup(&mut self, fieldnames: &[&str]) -> Result<()> {
self.did_lookup = true;
self.columns = Vec::new();
let mut no_cols: HashSet<usize> = HashSet::new();
for s in &self.neg {
for x in Self::range(fieldnames, s)? {
no_cols.insert(x.num);
}
}
if self.pos.is_empty() {
for x in 0..fieldnames.len() {
if !no_cols.contains(&x) {
self.columns.push(OutCol::from_num(x));
}
}
} else {
for s in &self.pos {
for x in Self::range(fieldnames, s)? {
if !no_cols.contains(&x.num) {
self.columns.push(x);
}
}
}
}
Ok(())
}
/// Select columns from input line based on `ColumnSet`. Fail if input is too short. """
/// # Examples
///
/// ```
/// use cdx::column::ColumnSet;
/// let header: [&str; 5] = ["zero", "one", "two", "three", "four"];
/// let mut s = ColumnSet::new();
/// s.add_no("two");
/// s.lookup(&header);
/// let v = ["Zeroth", "First", "Second", "Third", "Fourth", "Fifth"];
/// let mut res = Vec::new();
/// s.select(&v, &mut res);
/// assert_eq!(res, vec!["Zeroth", "First", "Third", "Fourth"]);
/// ```
pub fn select<T: AsRef<str> + Clone>(&self, cols: &[T], result: &mut Vec<T>) -> Result<()> {
if !self.did_lookup {
return Err(Error::NeedLookup);
}
result.clear();
for x in &self.columns {
if x.num < cols.len() {
result.push(cols[x.num].clone());
} else {
return err!(
"Line has only {} columns, but column {} was requested.",
cols.len(),
x.num + 1
);
}
}
Ok(())
}
/// write the appropriate selection from the given columns
/// trying to write a non-existant column is an error
pub fn write(&self, w: &mut dyn Write, cols: &[&str], delim: &str) -> Result<()> {
if !self.did_lookup {
return Err(Error::NeedLookup);
}
let mut iter = self.columns.iter();
match iter.next() {
None => {}
Some(first) => {
w.write_all(cols[first.num].as_bytes())?;
for x in iter {
w.write_all(delim.as_bytes())?;
if x.num < cols.len() {
w.write_all(cols[x.num].as_bytes())?;
} else {
return err!(
"Line has only {} columns, but column {} was requested.",
cols.len(),
x.num + 1
);
}
}
}
};
w.write_all(&[b'\n'])?;
Ok(())
}
/// write the appropriate selection from the given columns
pub fn write2(&self, w: &mut dyn Write, cols: &TextLine, delim: u8) -> Result<()> {
if !self.did_lookup {
return Err(Error::NeedLookup);
}
let mut iter = self.columns.iter();
match iter.next() {
None => {}
Some(first) => {
w.write_all(&cols[first.num])?;
for x in iter {
w.write_all(&[delim])?;
w.write_all(cols.get(x.num))?;
}
}
};
w.write_all(&[b'\n'])?;
Ok(())
}
/// write the appropriate selection from the given columns, but no trailing newline
pub fn write3(&self, w: &mut dyn Write, cols: &TextLine, delim: u8) -> Result<()> {
if !self.did_lookup {
return Err(Error::NeedLookup);
}
let mut iter = self.columns.iter();
match iter.next() {
None => {}
Some(first) => {
w.write_all(cols.get(first.num))?;
for x in iter {
w.write_all(&[delim])?;
w.write_all(cols.get(x.num))?;
}
}
};
Ok(())
}
/// write the appropriate selection from the given columns, but no trailing newline
pub fn write3s(&self, w: &mut dyn Write, cols: &StringLine, delim: u8) -> Result<()> {
if !self.did_lookup {
return Err(Error::NeedLookup);
}
let mut iter = self.columns.iter();
match iter.next() {
None => {}
Some(first) => {
w.write_all(cols.get(first.num).as_bytes())?;
for x in iter {
w.write_all(&[delim])?;
w.write_all(cols.get(x.num).as_bytes())?;
}
}
};
Ok(())
}
/// write the appropriate selection from the given columns, but no trailing newline
/// trying to write a non-existant column writes the provided default value
pub fn write_sloppy(&self, cols: &[&str], rest: &str, w: &mut dyn Write) -> Result<()> {
if !self.did_lookup {
return Err(Error::NeedLookup);
}
for x in &self.columns {
if x.num < cols.len() {
w.write_all(cols[x.num].as_bytes())?;
} else {
w.write_all(rest.as_bytes())?;
}
}
Ok(())
}
/// Select columns from input line based on `ColumnSet`, fill in default if line is too short """
/// # Examples
///
/// ```
/// use cdx::column::ColumnSet;
/// let header: [&str; 5] = ["zero", "one", "two", "three", "four"];
/// let mut s = ColumnSet::new();
/// s.add_no("two");
/// s.lookup(&header);
/// let v = ["Zeroth", "First", "Second", "Third"];
/// let mut res = Vec::new();
/// s.select_sloppy(&v, &"extra", &mut res);
/// assert_eq!(res, vec!["Zeroth", "First", "Third", "extra"]);
/// ```
pub fn select_sloppy<T: AsRef<str> + Clone>(
&self,
cols: &[T],
restval: &T,
result: &mut Vec<T>,
) -> Result<()> {
if !self.did_lookup {
return Err(Error::NeedLookup);
}
result.clear();
for x in &self.columns {
if x.num < cols.len() {
result.push(cols[x.num].clone());
} else {
result.push(restval.clone());
}
}
Ok(())
}
/// return owned columns by const reference
pub fn get_cols(&self) -> &Vec<OutCol> {
&self.columns
}
/// steal owned columns by value
pub fn get_cols_full(self) -> Vec<OutCol> {
self.columns
}
/// get owned column numbers
pub fn get_cols_num(&self) -> Vec<usize> {
let mut v = Vec::with_capacity(self.columns.len());
for x in &self.columns {
v.push(x.num);
}
v
}
/// Shorthand to look up some columns
/// # Examples
///
/// ```
/// use cdx::column::ColumnSet;
/// let header: [&str; 5] = ["zero", "one", "two", "three", "four"];
/// assert_eq!(ColumnSet::lookup_cols("~2-3", &header).unwrap(), &[0,3,4]);
/// ```
pub fn lookup_cols(spec: &str, names: &[&str]) -> Result<Vec<usize>> {
let mut s = ColumnSet::new();
s.add_yes(spec);
s.lookup(names)?;
Ok(s.get_cols_num())
}
/// Shorthand to look up some columns, with names
pub fn lookup_cols_full(spec: &str, names: &[&str]) -> Result<Vec<OutCol>> {
let mut s = ColumnSet::new();
s.add_yes(spec);
s.lookup(names)?;
Ok(s.get_cols_full())
}
/// Shorthand to look up a single column
/// To look up a single named column, `lookup_col` is also available
/// # Examples
///
/// ```
/// use cdx::column::ColumnSet;
/// let header: [&str; 5] = ["zero", "one", "two", "three", "four"];
/// assert_eq!(ColumnSet::lookup1("three", &header).unwrap(), 3);
/// ```
pub fn lookup1(spec: &str, names: &[&str]) -> Result<usize> {
let mut s = ColumnSet::new();
s.add_yes(spec);
s.lookup(names)?;
if s.get_cols().len() != 1 {
return err!(
"Spec {} resolves to {} columns, rather than a single column",
spec,
s.get_cols().len()
);
}
Ok(s.get_cols_num()[0])
}
}
/// Write the columns with a custom delimiter
pub struct ColumnClump<'a> {
cols: Box<dyn ColumnFun + 'a>,
name: String,
delim: u8,
}
impl fmt::Debug for ColumnClump<'_> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "ColumnClump")
}
}
impl<'a> ColumnClump<'a> {
/// new ColumnClump from parts
pub fn new(cols: Box<dyn ColumnFun + 'a>, name: &str, delim: u8) -> Self {
Self {
cols,
name: name.to_string(),
delim,
}
}
/// new ColumnClump from spec : DelimOutcol:Columns
/// e.g. ,group:1-3
pub fn from_spec(orig_spec: &str) -> Result<Self> {
let mut spec = orig_spec;
if spec.is_empty() {
return err!("Can't construct a group from an empty string");
}
let delim = spec.take_first();
if delim.len_utf8() != 1 {
return err!("Delimiter must be a plain ascii character : {}", orig_spec);
}
let parts = spec.split_once(':');
if parts.is_none() {
return err!(
"No colon found. Group format is DelimOutname:Columns : {}",
orig_spec
);
}
let parts = parts.unwrap();
let mut g = ColumnSet::new();
g.add_yes(parts.1);
let cols = Box::new(ReaderColumns::new(g));
Ok(Self {
cols,
name: parts.0.to_string(),
delim: delim as u8,
})
}More examples
src/bin/cdx/join_main.rs (line 38)
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pub fn main(argv: &[String]) -> Result<()> {
let prog = args::ProgSpec::new("Join files on a matching column.", args::FileCount::Many);
const A: [ArgSpec; 4] = [
arg! {"also", "a", "FileNum,FileName", "Write non-matching lines from this file to this file."},
arg! {"file", "f", "OutputFile", "Output File Name, default '-' for stdout"},
arg! {"key", "k", "Spec", "How to compare lines"},
arg! {"output", "o", "Spec", "Output columns : file.ColumnSet,file.ColumnSet"},
];
let (args, files) = args::parse(&prog, &A, argv);
let mut config = JoinConfig::new();
config.infiles = files;
for x in args {
if x.name == "key" {
config.keys.push(x.value);
} else if x.name == "output" {
let mut file: Option<usize> = None;
let mut set = ColumnSet::new();
for y in x.value.split(',') {
let z = y.split_once('.');
if let Some((num, spec)) = z {
if !set.is_empty() {
config.out_cols.push(OutColSpec::new(file.unwrap(), set));
set = ColumnSet::new();
}
let fnum = num.parse::<usize>()?;
if fnum == 0 {
return err!("file number must be greater than zero {}", y);
}
file = Some(fnum - 1);
set.add_yes(spec);
} else {
if file.is_none() {
return err!(
"First part of output spec must start with 'file.' {}",
x.value
);
}
set.add_yes(y);
}
}
if !set.is_empty() {
config.out_cols.push(OutColSpec::new(file.unwrap(), set));
}
} else if x.name == "file" {
config.match_out = x.value;
} else if x.name == "also" {
let parts = x.value.split_once(',');
if let Some((a, b)) = parts {
config
.unmatch_out
.push(NoMatch::new(a.parse::<usize>()?, b));
} else {
return err!("--also format is FileNum,FileName {}", x.value);
}
} else {
unreachable!();
}
}
config.join()
}Add a spec, “yes” or “no” based on a flag.
Turn column name into column number
To also handle numbers and ranges, use lookup1
Examples
use cdx::column::ColumnSet;
assert_eq!(ColumnSet::lookup_col(&["zero", "one", "two"], "one").unwrap(), 1);Examples found in repository
src/column.rs (line 369)
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pub fn single(fieldnames: &[&str], colname: &str) -> Result<usize> {
if let Some(stripped) = colname.strip_prefix('+') {
let n = str_to_u_whole(stripped.as_bytes())? as usize;
let len = fieldnames.len();
if n > len {
err!("Column {} out of bounds", colname)
} else {
Ok(len - n)
}
} else {
let ch = colname.chars().next().unwrap();
if ch.is_ascii_digit() {
let n = str_to_u_whole(colname.as_bytes())? as usize;
if n < 1 {
err!("Column {} out of bounds", colname)
} else {
Ok(n - 1)
}
} else {
Self::lookup_col(fieldnames, colname)
}
}
}
/// determine if two strings match, given an operator
fn do_compare(left: &str, right: &str, operator: &str) -> Result<bool> {
let val = left.cmp(right);
if operator == "<" {
return Ok(val == Ordering::Less);
}
if operator == "<=" {
return Ok(val != Ordering::Greater);
}
if operator == ">" {
return Ok(val == Ordering::Greater);
}
if operator == ">=" {
return Ok(val != Ordering::Less);
}
err!(operator.to_string())
}
/// determine if a name is within a range
fn do_compare2(name: &str, key1: &str, op1: &str, key2: &str, op2: &str) -> Result<bool> {
Ok(Self::do_compare(name, key1, op1)? && Self::do_compare(name, key2, op2)?)
}
/// Return all the fields that match the glob
fn glob_range(fieldnames: &[&str], rng: &str) -> Result<Vec<usize>> {
let mut ret = Vec::new();
for f in fieldnames.iter().enumerate() {
if f.1.glob(rng, Case::Sens) {
// allow case insensitive?
ret.push(f.0);
}
}
Ok(ret)
}
/// Return all the field numbers that match a textual spec like <foo or <foo>bar """
fn text_range(fieldnames: &[&str], rng: &str) -> Result<Vec<usize>> {
let mut ret = Vec::new();
lazy_static! {
static ref RE1: Regex = Regex::new("^([<>]=?)([^<>]+)$").unwrap();
static ref RE2: Regex = Regex::new("^([<>]=?)([^<>]+)([<>]=?)([^<>]+)$").unwrap();
}
if let Some(caps) = RE1.captures(rng) {
for f in fieldnames.iter().enumerate() {
if Self::do_compare(
f.1,
caps.get(2).unwrap().as_str(),
caps.get(1).unwrap().as_str(),
)? {
ret.push(f.0);
}
}
return Ok(ret);
}
if let Some(caps) = RE2.captures(rng) {
for f in fieldnames.iter().enumerate() {
if Self::do_compare2(
f.1,
caps.get(2).unwrap().as_str(),
caps.get(1).unwrap().as_str(),
caps.get(4).unwrap().as_str(),
caps.get(3).unwrap().as_str(),
)? {
ret.push(f.0);
}
}
return Ok(ret);
}
err!("Malformed Range {}", rng)
}
fn to_outcols(data: &[usize], name: &str) -> Vec<OutCol> {
let mut ret = Vec::with_capacity(data.len());
for x in data {
ret.push(OutCol::new(*x, name));
}
ret
}
/// turn comma delimited list of ranges into list of possibly named column numbers
pub fn ranges(fieldnames: &[&str], rng: &str) -> Result<Vec<OutCol>> {
let mut c = ColumnSet::new();
c.add_yes(rng);
c.lookup(fieldnames)?;
Ok(c.get_cols_full())
}
/// turn range into list of column numbers
fn range(fieldnames: &[&str], rng: &str) -> Result<Vec<OutCol>> {
if rng.is_empty() {
return err!("Empty Range {}", rng);
}
let (name, range) = match rng.split_once(':') {
None => ("", rng),
Some(x) => x,
};
let ch = range.chars().next().unwrap();
if ch == '<' || ch == '>' || ch == '=' {
return Ok(Self::to_outcols(
&Self::text_range(fieldnames, range)?,
name,
));
}
if range.contains('*') || rng.contains('?') {
return Ok(Self::to_outcols(
&Self::glob_range(fieldnames, range)?,
name,
));
}
let mut parts: Vec<&str> = range.split('-').collect();
if parts.len() > 2 {
return err!("Malformed Range {}", rng);
}
if parts[0].is_empty() {
parts[0] = "1";
}
let start: usize;
let end: usize;
if parts.len() == 1 {
start = Self::single(fieldnames, parts[0])?;
end = start;
} else {
if parts[1].is_empty() {
parts[1] = "+1";
}
start = Self::single(fieldnames, parts[0])?;
end = Self::single(fieldnames, parts[1])?;
}
if start > end {
// throw new CdxException("start > end, i.e. {" + parts.get(0) + " > " + parts.get(1));
return err!("Start greater than end : {}", rng);
}
let mut res = Vec::new();
for i in start..=end {
res.push(OutCol::new(i, name));
}
Ok(res)
}
/// resolve `ColumnSet` in context of the column names from an input file
/// # Examples
///
/// ```
/// use cdx::column::ColumnSet;
/// let header: [&str; 5] = ["zero", "one", "two", "three", "four"];
/// let mut s = ColumnSet::new();
/// s.add_no("two");
/// s.lookup(&header);
/// assert_eq!(s.get_cols_num(), &[0,1,3,4]);
/// ```
pub fn lookup(&mut self, fieldnames: &[&str]) -> Result<()> {
self.did_lookup = true;
self.columns = Vec::new();
let mut no_cols: HashSet<usize> = HashSet::new();
for s in &self.neg {
for x in Self::range(fieldnames, s)? {
no_cols.insert(x.num);
}
}
if self.pos.is_empty() {
for x in 0..fieldnames.len() {
if !no_cols.contains(&x) {
self.columns.push(OutCol::from_num(x));
}
}
} else {
for s in &self.pos {
for x in Self::range(fieldnames, s)? {
if !no_cols.contains(&x.num) {
self.columns.push(x);
}
}
}
}
Ok(())
}
/// Select columns from input line based on `ColumnSet`. Fail if input is too short. """
/// # Examples
///
/// ```
/// use cdx::column::ColumnSet;
/// let header: [&str; 5] = ["zero", "one", "two", "three", "four"];
/// let mut s = ColumnSet::new();
/// s.add_no("two");
/// s.lookup(&header);
/// let v = ["Zeroth", "First", "Second", "Third", "Fourth", "Fifth"];
/// let mut res = Vec::new();
/// s.select(&v, &mut res);
/// assert_eq!(res, vec!["Zeroth", "First", "Third", "Fourth"]);
/// ```
pub fn select<T: AsRef<str> + Clone>(&self, cols: &[T], result: &mut Vec<T>) -> Result<()> {
if !self.did_lookup {
return Err(Error::NeedLookup);
}
result.clear();
for x in &self.columns {
if x.num < cols.len() {
result.push(cols[x.num].clone());
} else {
return err!(
"Line has only {} columns, but column {} was requested.",
cols.len(),
x.num + 1
);
}
}
Ok(())
}
/// write the appropriate selection from the given columns
/// trying to write a non-existant column is an error
pub fn write(&self, w: &mut dyn Write, cols: &[&str], delim: &str) -> Result<()> {
if !self.did_lookup {
return Err(Error::NeedLookup);
}
let mut iter = self.columns.iter();
match iter.next() {
None => {}
Some(first) => {
w.write_all(cols[first.num].as_bytes())?;
for x in iter {
w.write_all(delim.as_bytes())?;
if x.num < cols.len() {
w.write_all(cols[x.num].as_bytes())?;
} else {
return err!(
"Line has only {} columns, but column {} was requested.",
cols.len(),
x.num + 1
);
}
}
}
};
w.write_all(&[b'\n'])?;
Ok(())
}
/// write the appropriate selection from the given columns
pub fn write2(&self, w: &mut dyn Write, cols: &TextLine, delim: u8) -> Result<()> {
if !self.did_lookup {
return Err(Error::NeedLookup);
}
let mut iter = self.columns.iter();
match iter.next() {
None => {}
Some(first) => {
w.write_all(&cols[first.num])?;
for x in iter {
w.write_all(&[delim])?;
w.write_all(cols.get(x.num))?;
}
}
};
w.write_all(&[b'\n'])?;
Ok(())
}
/// write the appropriate selection from the given columns, but no trailing newline
pub fn write3(&self, w: &mut dyn Write, cols: &TextLine, delim: u8) -> Result<()> {
if !self.did_lookup {
return Err(Error::NeedLookup);
}
let mut iter = self.columns.iter();
match iter.next() {
None => {}
Some(first) => {
w.write_all(cols.get(first.num))?;
for x in iter {
w.write_all(&[delim])?;
w.write_all(cols.get(x.num))?;
}
}
};
Ok(())
}
/// write the appropriate selection from the given columns, but no trailing newline
pub fn write3s(&self, w: &mut dyn Write, cols: &StringLine, delim: u8) -> Result<()> {
if !self.did_lookup {
return Err(Error::NeedLookup);
}
let mut iter = self.columns.iter();
match iter.next() {
None => {}
Some(first) => {
w.write_all(cols.get(first.num).as_bytes())?;
for x in iter {
w.write_all(&[delim])?;
w.write_all(cols.get(x.num).as_bytes())?;
}
}
};
Ok(())
}
/// write the appropriate selection from the given columns, but no trailing newline
/// trying to write a non-existant column writes the provided default value
pub fn write_sloppy(&self, cols: &[&str], rest: &str, w: &mut dyn Write) -> Result<()> {
if !self.did_lookup {
return Err(Error::NeedLookup);
}
for x in &self.columns {
if x.num < cols.len() {
w.write_all(cols[x.num].as_bytes())?;
} else {
w.write_all(rest.as_bytes())?;
}
}
Ok(())
}
/// Select columns from input line based on `ColumnSet`, fill in default if line is too short """
/// # Examples
///
/// ```
/// use cdx::column::ColumnSet;
/// let header: [&str; 5] = ["zero", "one", "two", "three", "four"];
/// let mut s = ColumnSet::new();
/// s.add_no("two");
/// s.lookup(&header);
/// let v = ["Zeroth", "First", "Second", "Third"];
/// let mut res = Vec::new();
/// s.select_sloppy(&v, &"extra", &mut res);
/// assert_eq!(res, vec!["Zeroth", "First", "Third", "extra"]);
/// ```
pub fn select_sloppy<T: AsRef<str> + Clone>(
&self,
cols: &[T],
restval: &T,
result: &mut Vec<T>,
) -> Result<()> {
if !self.did_lookup {
return Err(Error::NeedLookup);
}
result.clear();
for x in &self.columns {
if x.num < cols.len() {
result.push(cols[x.num].clone());
} else {
result.push(restval.clone());
}
}
Ok(())
}
/// return owned columns by const reference
pub fn get_cols(&self) -> &Vec<OutCol> {
&self.columns
}
/// steal owned columns by value
pub fn get_cols_full(self) -> Vec<OutCol> {
self.columns
}
/// get owned column numbers
pub fn get_cols_num(&self) -> Vec<usize> {
let mut v = Vec::with_capacity(self.columns.len());
for x in &self.columns {
v.push(x.num);
}
v
}
/// Shorthand to look up some columns
/// # Examples
///
/// ```
/// use cdx::column::ColumnSet;
/// let header: [&str; 5] = ["zero", "one", "two", "three", "four"];
/// assert_eq!(ColumnSet::lookup_cols("~2-3", &header).unwrap(), &[0,3,4]);
/// ```
pub fn lookup_cols(spec: &str, names: &[&str]) -> Result<Vec<usize>> {
let mut s = ColumnSet::new();
s.add_yes(spec);
s.lookup(names)?;
Ok(s.get_cols_num())
}
/// Shorthand to look up some columns, with names
pub fn lookup_cols_full(spec: &str, names: &[&str]) -> Result<Vec<OutCol>> {
let mut s = ColumnSet::new();
s.add_yes(spec);
s.lookup(names)?;
Ok(s.get_cols_full())
}
/// Shorthand to look up a single column
/// To look up a single named column, `lookup_col` is also available
/// # Examples
///
/// ```
/// use cdx::column::ColumnSet;
/// let header: [&str; 5] = ["zero", "one", "two", "three", "four"];
/// assert_eq!(ColumnSet::lookup1("three", &header).unwrap(), 3);
/// ```
pub fn lookup1(spec: &str, names: &[&str]) -> Result<usize> {
let mut s = ColumnSet::new();
s.add_yes(spec);
s.lookup(names)?;
if s.get_cols().len() != 1 {
return err!(
"Spec {} resolves to {} columns, rather than a single column",
spec,
s.get_cols().len()
);
}
Ok(s.get_cols_num()[0])
}
}
/// Write the columns with a custom delimiter
pub struct ColumnClump<'a> {
cols: Box<dyn ColumnFun + 'a>,
name: String,
delim: u8,
}
impl fmt::Debug for ColumnClump<'_> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "ColumnClump")
}
}
impl<'a> ColumnClump<'a> {
/// new ColumnClump from parts
pub fn new(cols: Box<dyn ColumnFun + 'a>, name: &str, delim: u8) -> Self {
Self {
cols,
name: name.to_string(),
delim,
}
}
/// new ColumnClump from spec : DelimOutcol:Columns
/// e.g. ,group:1-3
pub fn from_spec(orig_spec: &str) -> Result<Self> {
let mut spec = orig_spec;
if spec.is_empty() {
return err!("Can't construct a group from an empty string");
}
let delim = spec.take_first();
if delim.len_utf8() != 1 {
return err!("Delimiter must be a plain ascii character : {}", orig_spec);
}
let parts = spec.split_once(':');
if parts.is_none() {
return err!(
"No colon found. Group format is DelimOutname:Columns : {}",
orig_spec
);
}
let parts = parts.unwrap();
let mut g = ColumnSet::new();
g.add_yes(parts.1);
let cols = Box::new(ReaderColumns::new(g));
Ok(Self {
cols,
name: parts.0.to_string(),
delim: delim as u8,
})
}
}
impl<'a> ColumnFun for ColumnClump<'a> {
fn write(&self, w: &mut dyn Write, line: &TextLine, _delim: u8) -> Result<()> {
self.cols.write(w, line, self.delim)?;
Ok(())
}
fn write_names(&self, w: &mut dyn Write, _head: &StringLine, _delim: u8) -> Result<()> {
w.write_all(self.name.as_bytes())?;
Ok(())
}
fn lookup(&mut self, fieldnames: &[&str]) -> Result<()> {
self.cols.lookup(fieldnames)
}
}
/// Selection of columns from a Reader
#[derive(Debug)]
pub struct ReaderColumns {
columns: ColumnSet,
}
impl ReaderColumns {
/// new ReaderColumns
pub fn new(columns: ColumnSet) -> Self {
Self { columns }
}
}
/// Write column name : col.name if non empty, else head[col.num]
pub fn write_colname(w: &mut dyn Write, col: &OutCol, head: &StringLine) -> Result<()> {
if col.name.is_empty() {
w.write_all(head.get(col.num).as_bytes())?;
} else {
w.write_all(col.name.as_bytes())?;
}
Ok(())
}
impl ColumnFun for ReaderColumns {
fn write(&self, w: &mut dyn Write, line: &TextLine, delim: u8) -> Result<()> {
self.columns.write3(w, line, delim)?;
Ok(())
}
fn write_names(&self, w: &mut dyn Write, head: &StringLine, delim: u8) -> Result<()> {
let mut iter = self.columns.get_cols().iter();
match iter.next() {
None => {}
Some(first) => {
write_colname(w, first, head)?;
for x in iter {
w.write_all(&[delim])?;
write_colname(w, x, head)?;
}
}
}
// self.columns.write3s(w, head, delim)?;
Ok(())
}
fn lookup(&mut self, fieldnames: &[&str]) -> Result<()> {
self.columns.lookup(fieldnames)
}
}
/// A collection of ColumnFun writers
pub struct Writer<'a> {
v: Vec<Box<dyn ColumnFun + 'a>>,
delim: u8,
}
impl fmt::Debug for Writer<'_> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "Writer")
}
}
impl<'a> Writer<'a> {
/// new Writer
pub fn new(delim: u8) -> Self {
Self {
v: Vec::new(),
delim,
}
}
/// is it empty
pub fn is_empty(&self) -> bool {
self.v.is_empty()
}
/// resolve column names
pub fn lookup(&mut self, fieldnames: &[&str]) -> Result<()> {
for x in self.v.iter_mut() {
x.lookup(fieldnames)?
}
Ok(())
}
/// Add a new writer
pub fn push(&mut self, x: Box<dyn ColumnFun + 'a>) {
self.v.push(x);
}
/// Write the column names
pub fn write_names(&self, w: &mut dyn Write, head: &StringLine) -> Result<()> {
w.write_all(b" CDX")?;
for x in self.v.iter() {
w.write_all(&[self.delim])?;
x.write_names(w, head, self.delim)?;
}
w.write_all(&[b'\n'])?;
Ok(())
}
/// Write the column values
pub fn write(&self, w: &mut dyn Write, line: &TextLine) -> Result<()> {
let mut iter = self.v.iter();
match iter.next() {
None => {}
Some(first) => {
first.write(w, line, self.delim)?;
for x in iter {
w.write_all(&[self.delim])?;
x.write(w, line, self.delim)?;
}
}
};
w.write_all(&[b'\n'])?;
Ok(())
}
}
impl<'a> Default for Writer<'a> {
fn default() -> Self {
Self::new(b'\t')
}
}
/// a column, by name or number
#[derive(Debug, Clone)]
pub struct NamedCol {
/// the column name. Empty if using column by number
pub name: String,
/// the columnn number, either as originally set or after lookup
pub num: usize,
/// if non-zero, input was "+2" so num should be calculated as (num_cols - from_end)
pub from_end: usize,
}
impl NamedCol {
/// new named column
pub fn new() -> Self {
Self {
name: String::new(),
num: 0,
from_end: 0,
}
}
/// Resolve the column name
pub fn lookup(&mut self, fieldnames: &[&str]) -> Result<()> {
if !self.name.is_empty() {
self.num = ColumnSet::lookup_col(fieldnames, &self.name)?
} else if self.from_end > 0 {
if self.from_end > fieldnames.len() {
return err!(
"Requested column +{}, but there are only {} columns",
self.from_end,
fieldnames.len()
);
}
self.num = fieldnames.len() - self.from_end
}
Ok(())
}resolve a single name or number into a column number
Examples
use cdx::column::ColumnSet;
assert_eq!(ColumnSet::single(&["zero", "one", "two"], "+1").unwrap(), 2);Examples found in repository
src/column.rs (line 497)
≺ ≻
463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516
fn range(fieldnames: &[&str], rng: &str) -> Result<Vec<OutCol>> {
if rng.is_empty() {
return err!("Empty Range {}", rng);
}
let (name, range) = match rng.split_once(':') {
None => ("", rng),
Some(x) => x,
};
let ch = range.chars().next().unwrap();
if ch == '<' || ch == '>' || ch == '=' {
return Ok(Self::to_outcols(
&Self::text_range(fieldnames, range)?,
name,
));
}
if range.contains('*') || rng.contains('?') {
return Ok(Self::to_outcols(
&Self::glob_range(fieldnames, range)?,
name,
));
}
let mut parts: Vec<&str> = range.split('-').collect();
if parts.len() > 2 {
return err!("Malformed Range {}", rng);
}
if parts[0].is_empty() {
parts[0] = "1";
}
let start: usize;
let end: usize;
if parts.len() == 1 {
start = Self::single(fieldnames, parts[0])?;
end = start;
} else {
if parts[1].is_empty() {
parts[1] = "+1";
}
start = Self::single(fieldnames, parts[0])?;
end = Self::single(fieldnames, parts[1])?;
}
if start > end {
// throw new CdxException("start > end, i.e. {" + parts.get(0) + " > " + parts.get(1));
return err!("Start greater than end : {}", rng);
}
let mut res = Vec::new();
for i in start..=end {
res.push(OutCol::new(i, name));
}
Ok(res)
}turn comma delimited list of ranges into list of possibly named column numbers
resolve ColumnSet in context of the column names from an input file
Examples
use cdx::column::ColumnSet;
let header: [&str; 5] = ["zero", "one", "two", "three", "four"];
let mut s = ColumnSet::new();
s.add_no("two");
s.lookup(&header);
assert_eq!(s.get_cols_num(), &[0,1,3,4]);Examples found in repository
src/column.rs (line 148)
≺ ≻
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pub fn lookup(&mut self, fieldnames: &[&str]) -> Result<()> {
self.cols.lookup(fieldnames)
}
}
/// A per-column value
#[derive(Debug, Clone, Default)]
pub struct ScopedValues {
default: String,
data: Vec<ScopedValue>,
has_value: Vec<bool>,
strings: Vec<String>,
ints: Vec<i64>,
floats: Vec<f64>,
}
impl ScopedValues {
/// new
pub fn new() -> Self {
ScopedValues::default()
}
/// value for column not otherwise assigned a value
pub fn set_default(&mut self, d: &str) {
self.default = d.to_string();
}
/// resolve named columns
pub fn lookup(&mut self, fieldnames: &[&str]) -> Result<()> {
self.has_value.clear();
self.has_value.resize(fieldnames.len(), false);
self.strings.clear();
self.strings.resize(fieldnames.len(), self.default.clone());
for x in &mut self.data {
x.lookup(fieldnames)?;
for i in 0..x.cols.columns.len() {
self.strings[i] = x.value.clone();
self.has_value[i] = true;
}
}
Ok(())
}
/// do the work so that get_int() will work properly
pub fn make_ints(&mut self) -> Result<()> {
self.ints.clear();
for i in 0..self.strings.len() {
self.ints[i] = self.get(i).parse::<i64>()?;
}
Ok(())
}
/// do the work so that get_int() will work properly
pub fn make_floats(&mut self) -> Result<()> {
self.floats.clear();
for i in 0..self.strings.len() {
self.floats[i] = self.get(i).parse::<f64>()?;
}
Ok(())
}
/// add one ScopedValue
pub fn add(&mut self, spec: &str, del: char) {
self.data.push(ScopedValue::new(spec, del));
}
/// add one ScopedValue
pub fn add2(&mut self, value: &str, cols: &str) {
self.data.push(ScopedValue::new2(value, cols));
}
/// get appropriate value for the column
pub fn get(&self, col: usize) -> &str {
if col < self.strings.len() {
&self.strings[col]
} else {
self.strings.last().unwrap()
}
}
/// get appropriate int value for the column
pub fn get_int(&self, col: usize) -> i64 {
if col < self.ints.len() {
self.ints[col]
} else {
*self.ints.last().unwrap()
}
}
/// get appropriate int value for the column
pub fn get_float(&self, col: usize) -> f64 {
if col < self.floats.len() {
self.floats[col]
} else {
*self.floats.last().unwrap()
}
}
/// has this column been assigned a value?
pub fn has_value(&self, col: usize) -> bool {
if col < self.has_value.len() {
self.has_value[col]
} else {
false
}
}
/// Have any column been assigned values?
pub fn is_empty(&self) -> bool {
self.data.is_empty()
}
}
/// Write some output
pub trait ColumnFun {
/// write the column names (called once)
fn write_names(&self, w: &mut dyn Write, head: &StringLine, delim: u8) -> Result<()>;
/// write the column values (called many times)
fn write(&self, w: &mut dyn Write, line: &TextLine, delim: u8) -> Result<()>;
/// resolve any named columns
fn lookup(&mut self, fieldnames: &[&str]) -> Result<()>;
}
impl fmt::Debug for dyn ColumnFun {
fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
write!(f, "ColumnFun")
}
}
impl ColumnSet {
/// Create an empty column set, which selects all columns.
pub fn new() -> Self {
ColumnSet::default()
}
/// is empty?
pub fn is_empty(&self) -> bool {
self.pos.is_empty() && self.neg.is_empty()
}
/// Create an column set from a spec, e.g. "1-3"
pub fn from_spec(spec: &str) -> Self {
let mut s = ColumnSet::default();
s.add_yes(spec);
s
}
/// Add some columns to be selected
pub fn add_yes(&mut self, spec: &str) {
self.add(spec, false);
}
/// Add some columns to be rejected.
pub fn add_no(&mut self, spec: &str) {
self.add(spec, true);
}
/// Add a spec, "yes" or "no" based on a flag.
pub fn add(&mut self, spec: &str, negate: bool) {
for s in spec.split(',') {
if let Some(stripped) = s.strip_prefix('~') {
let st = stripped.to_string();
if negate {
self.pos.push(st);
} else {
self.neg.push(st);
}
} else {
let st = s.to_string();
if negate {
self.neg.push(st);
} else {
self.pos.push(st);
}
}
}
}
/// Turn column name into column number
/// To also handle numbers and ranges, use `lookup1`
/// # Examples
///
/// ```
/// use cdx::column::ColumnSet;
/// assert_eq!(ColumnSet::lookup_col(&["zero", "one", "two"], "one").unwrap(), 1);
/// ```
pub fn lookup_col(fieldnames: &[&str], colname: &str) -> Result<usize> {
for f in fieldnames.iter().enumerate() {
if f.1 == &colname {
return Ok(f.0);
}
}
err!("{} not found", colname)
}
/*
/// turn a u8 column name into a column number
pub fn lookup_col2(fieldnames: &[&str], colname: &[u8]) -> Result<usize> {
let name = str::from_utf8_lossy(colname);
for f in fieldnames.iter().enumerate() {
if *f.1 == name {
return Ok(f.0);
}
}
err!("{:?} not found", &colname)
}
*/
/// resolve a single name or number into a column number
/// # Examples
///
/// ```
/// use cdx::column::ColumnSet;
/// assert_eq!(ColumnSet::single(&["zero", "one", "two"], "+1").unwrap(), 2);
/// ```
pub fn single(fieldnames: &[&str], colname: &str) -> Result<usize> {
if let Some(stripped) = colname.strip_prefix('+') {
let n = str_to_u_whole(stripped.as_bytes())? as usize;
let len = fieldnames.len();
if n > len {
err!("Column {} out of bounds", colname)
} else {
Ok(len - n)
}
} else {
let ch = colname.chars().next().unwrap();
if ch.is_ascii_digit() {
let n = str_to_u_whole(colname.as_bytes())? as usize;
if n < 1 {
err!("Column {} out of bounds", colname)
} else {
Ok(n - 1)
}
} else {
Self::lookup_col(fieldnames, colname)
}
}
}
/// determine if two strings match, given an operator
fn do_compare(left: &str, right: &str, operator: &str) -> Result<bool> {
let val = left.cmp(right);
if operator == "<" {
return Ok(val == Ordering::Less);
}
if operator == "<=" {
return Ok(val != Ordering::Greater);
}
if operator == ">" {
return Ok(val == Ordering::Greater);
}
if operator == ">=" {
return Ok(val != Ordering::Less);
}
err!(operator.to_string())
}
/// determine if a name is within a range
fn do_compare2(name: &str, key1: &str, op1: &str, key2: &str, op2: &str) -> Result<bool> {
Ok(Self::do_compare(name, key1, op1)? && Self::do_compare(name, key2, op2)?)
}
/// Return all the fields that match the glob
fn glob_range(fieldnames: &[&str], rng: &str) -> Result<Vec<usize>> {
let mut ret = Vec::new();
for f in fieldnames.iter().enumerate() {
if f.1.glob(rng, Case::Sens) {
// allow case insensitive?
ret.push(f.0);
}
}
Ok(ret)
}
/// Return all the field numbers that match a textual spec like <foo or <foo>bar """
fn text_range(fieldnames: &[&str], rng: &str) -> Result<Vec<usize>> {
let mut ret = Vec::new();
lazy_static! {
static ref RE1: Regex = Regex::new("^([<>]=?)([^<>]+)$").unwrap();
static ref RE2: Regex = Regex::new("^([<>]=?)([^<>]+)([<>]=?)([^<>]+)$").unwrap();
}
if let Some(caps) = RE1.captures(rng) {
for f in fieldnames.iter().enumerate() {
if Self::do_compare(
f.1,
caps.get(2).unwrap().as_str(),
caps.get(1).unwrap().as_str(),
)? {
ret.push(f.0);
}
}
return Ok(ret);
}
if let Some(caps) = RE2.captures(rng) {
for f in fieldnames.iter().enumerate() {
if Self::do_compare2(
f.1,
caps.get(2).unwrap().as_str(),
caps.get(1).unwrap().as_str(),
caps.get(4).unwrap().as_str(),
caps.get(3).unwrap().as_str(),
)? {
ret.push(f.0);
}
}
return Ok(ret);
}
err!("Malformed Range {}", rng)
}
fn to_outcols(data: &[usize], name: &str) -> Vec<OutCol> {
let mut ret = Vec::with_capacity(data.len());
for x in data {
ret.push(OutCol::new(*x, name));
}
ret
}
/// turn comma delimited list of ranges into list of possibly named column numbers
pub fn ranges(fieldnames: &[&str], rng: &str) -> Result<Vec<OutCol>> {
let mut c = ColumnSet::new();
c.add_yes(rng);
c.lookup(fieldnames)?;
Ok(c.get_cols_full())
}
/// turn range into list of column numbers
fn range(fieldnames: &[&str], rng: &str) -> Result<Vec<OutCol>> {
if rng.is_empty() {
return err!("Empty Range {}", rng);
}
let (name, range) = match rng.split_once(':') {
None => ("", rng),
Some(x) => x,
};
let ch = range.chars().next().unwrap();
if ch == '<' || ch == '>' || ch == '=' {
return Ok(Self::to_outcols(
&Self::text_range(fieldnames, range)?,
name,
));
}
if range.contains('*') || rng.contains('?') {
return Ok(Self::to_outcols(
&Self::glob_range(fieldnames, range)?,
name,
));
}
let mut parts: Vec<&str> = range.split('-').collect();
if parts.len() > 2 {
return err!("Malformed Range {}", rng);
}
if parts[0].is_empty() {
parts[0] = "1";
}
let start: usize;
let end: usize;
if parts.len() == 1 {
start = Self::single(fieldnames, parts[0])?;
end = start;
} else {
if parts[1].is_empty() {
parts[1] = "+1";
}
start = Self::single(fieldnames, parts[0])?;
end = Self::single(fieldnames, parts[1])?;
}
if start > end {
// throw new CdxException("start > end, i.e. {" + parts.get(0) + " > " + parts.get(1));
return err!("Start greater than end : {}", rng);
}
let mut res = Vec::new();
for i in start..=end {
res.push(OutCol::new(i, name));
}
Ok(res)
}
/// resolve `ColumnSet` in context of the column names from an input file
/// # Examples
///
/// ```
/// use cdx::column::ColumnSet;
/// let header: [&str; 5] = ["zero", "one", "two", "three", "four"];
/// let mut s = ColumnSet::new();
/// s.add_no("two");
/// s.lookup(&header);
/// assert_eq!(s.get_cols_num(), &[0,1,3,4]);
/// ```
pub fn lookup(&mut self, fieldnames: &[&str]) -> Result<()> {
self.did_lookup = true;
self.columns = Vec::new();
let mut no_cols: HashSet<usize> = HashSet::new();
for s in &self.neg {
for x in Self::range(fieldnames, s)? {
no_cols.insert(x.num);
}
}
if self.pos.is_empty() {
for x in 0..fieldnames.len() {
if !no_cols.contains(&x) {
self.columns.push(OutCol::from_num(x));
}
}
} else {
for s in &self.pos {
for x in Self::range(fieldnames, s)? {
if !no_cols.contains(&x.num) {
self.columns.push(x);
}
}
}
}
Ok(())
}
/// Select columns from input line based on `ColumnSet`. Fail if input is too short. """
/// # Examples
///
/// ```
/// use cdx::column::ColumnSet;
/// let header: [&str; 5] = ["zero", "one", "two", "three", "four"];
/// let mut s = ColumnSet::new();
/// s.add_no("two");
/// s.lookup(&header);
/// let v = ["Zeroth", "First", "Second", "Third", "Fourth", "Fifth"];
/// let mut res = Vec::new();
/// s.select(&v, &mut res);
/// assert_eq!(res, vec!["Zeroth", "First", "Third", "Fourth"]);
/// ```
pub fn select<T: AsRef<str> + Clone>(&self, cols: &[T], result: &mut Vec<T>) -> Result<()> {
if !self.did_lookup {
return Err(Error::NeedLookup);
}
result.clear();
for x in &self.columns {
if x.num < cols.len() {
result.push(cols[x.num].clone());
} else {
return err!(
"Line has only {} columns, but column {} was requested.",
cols.len(),
x.num + 1
);
}
}
Ok(())
}
/// write the appropriate selection from the given columns
/// trying to write a non-existant column is an error
pub fn write(&self, w: &mut dyn Write, cols: &[&str], delim: &str) -> Result<()> {
if !self.did_lookup {
return Err(Error::NeedLookup);
}
let mut iter = self.columns.iter();
match iter.next() {
None => {}
Some(first) => {
w.write_all(cols[first.num].as_bytes())?;
for x in iter {
w.write_all(delim.as_bytes())?;
if x.num < cols.len() {
w.write_all(cols[x.num].as_bytes())?;
} else {
return err!(
"Line has only {} columns, but column {} was requested.",
cols.len(),
x.num + 1
);
}
}
}
};
w.write_all(&[b'\n'])?;
Ok(())
}
/// write the appropriate selection from the given columns
pub fn write2(&self, w: &mut dyn Write, cols: &TextLine, delim: u8) -> Result<()> {
if !self.did_lookup {
return Err(Error::NeedLookup);
}
let mut iter = self.columns.iter();
match iter.next() {
None => {}
Some(first) => {
w.write_all(&cols[first.num])?;
for x in iter {
w.write_all(&[delim])?;
w.write_all(cols.get(x.num))?;
}
}
};
w.write_all(&[b'\n'])?;
Ok(())
}
/// write the appropriate selection from the given columns, but no trailing newline
pub fn write3(&self, w: &mut dyn Write, cols: &TextLine, delim: u8) -> Result<()> {
if !self.did_lookup {
return Err(Error::NeedLookup);
}
let mut iter = self.columns.iter();
match iter.next() {
None => {}
Some(first) => {
w.write_all(cols.get(first.num))?;
for x in iter {
w.write_all(&[delim])?;
w.write_all(cols.get(x.num))?;
}
}
};
Ok(())
}
/// write the appropriate selection from the given columns, but no trailing newline
pub fn write3s(&self, w: &mut dyn Write, cols: &StringLine, delim: u8) -> Result<()> {
if !self.did_lookup {
return Err(Error::NeedLookup);
}
let mut iter = self.columns.iter();
match iter.next() {
None => {}
Some(first) => {
w.write_all(cols.get(first.num).as_bytes())?;
for x in iter {
w.write_all(&[delim])?;
w.write_all(cols.get(x.num).as_bytes())?;
}
}
};
Ok(())
}
/// write the appropriate selection from the given columns, but no trailing newline
/// trying to write a non-existant column writes the provided default value
pub fn write_sloppy(&self, cols: &[&str], rest: &str, w: &mut dyn Write) -> Result<()> {
if !self.did_lookup {
return Err(Error::NeedLookup);
}
for x in &self.columns {
if x.num < cols.len() {
w.write_all(cols[x.num].as_bytes())?;
} else {
w.write_all(rest.as_bytes())?;
}
}
Ok(())
}
/// Select columns from input line based on `ColumnSet`, fill in default if line is too short """
/// # Examples
///
/// ```
/// use cdx::column::ColumnSet;
/// let header: [&str; 5] = ["zero", "one", "two", "three", "four"];
/// let mut s = ColumnSet::new();
/// s.add_no("two");
/// s.lookup(&header);
/// let v = ["Zeroth", "First", "Second", "Third"];
/// let mut res = Vec::new();
/// s.select_sloppy(&v, &"extra", &mut res);
/// assert_eq!(res, vec!["Zeroth", "First", "Third", "extra"]);
/// ```
pub fn select_sloppy<T: AsRef<str> + Clone>(
&self,
cols: &[T],
restval: &T,
result: &mut Vec<T>,
) -> Result<()> {
if !self.did_lookup {
return Err(Error::NeedLookup);
}
result.clear();
for x in &self.columns {
if x.num < cols.len() {
result.push(cols[x.num].clone());
} else {
result.push(restval.clone());
}
}
Ok(())
}
/// return owned columns by const reference
pub fn get_cols(&self) -> &Vec<OutCol> {
&self.columns
}
/// steal owned columns by value
pub fn get_cols_full(self) -> Vec<OutCol> {
self.columns
}
/// get owned column numbers
pub fn get_cols_num(&self) -> Vec<usize> {
let mut v = Vec::with_capacity(self.columns.len());
for x in &self.columns {
v.push(x.num);
}
v
}
/// Shorthand to look up some columns
/// # Examples
///
/// ```
/// use cdx::column::ColumnSet;
/// let header: [&str; 5] = ["zero", "one", "two", "three", "four"];
/// assert_eq!(ColumnSet::lookup_cols("~2-3", &header).unwrap(), &[0,3,4]);
/// ```
pub fn lookup_cols(spec: &str, names: &[&str]) -> Result<Vec<usize>> {
let mut s = ColumnSet::new();
s.add_yes(spec);
s.lookup(names)?;
Ok(s.get_cols_num())
}
/// Shorthand to look up some columns, with names
pub fn lookup_cols_full(spec: &str, names: &[&str]) -> Result<Vec<OutCol>> {
let mut s = ColumnSet::new();
s.add_yes(spec);
s.lookup(names)?;
Ok(s.get_cols_full())
}
/// Shorthand to look up a single column
/// To look up a single named column, `lookup_col` is also available
/// # Examples
///
/// ```
/// use cdx::column::ColumnSet;
/// let header: [&str; 5] = ["zero", "one", "two", "three", "four"];
/// assert_eq!(ColumnSet::lookup1("three", &header).unwrap(), 3);
/// ```
pub fn lookup1(spec: &str, names: &[&str]) -> Result<usize> {
let mut s = ColumnSet::new();
s.add_yes(spec);
s.lookup(names)?;
if s.get_cols().len() != 1 {
return err!(
"Spec {} resolves to {} columns, rather than a single column",
spec,
s.get_cols().len()
);
}
Ok(s.get_cols_num()[0])
}
}
/// Write the columns with a custom delimiter
pub struct ColumnClump<'a> {
cols: Box<dyn ColumnFun + 'a>,
name: String,
delim: u8,
}
impl fmt::Debug for ColumnClump<'_> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "ColumnClump")
}
}
impl<'a> ColumnClump<'a> {
/// new ColumnClump from parts
pub fn new(cols: Box<dyn ColumnFun + 'a>, name: &str, delim: u8) -> Self {
Self {
cols,
name: name.to_string(),
delim,
}
}
/// new ColumnClump from spec : DelimOutcol:Columns
/// e.g. ,group:1-3
pub fn from_spec(orig_spec: &str) -> Result<Self> {
let mut spec = orig_spec;
if spec.is_empty() {
return err!("Can't construct a group from an empty string");
}
let delim = spec.take_first();
if delim.len_utf8() != 1 {
return err!("Delimiter must be a plain ascii character : {}", orig_spec);
}
let parts = spec.split_once(':');
if parts.is_none() {
return err!(
"No colon found. Group format is DelimOutname:Columns : {}",
orig_spec
);
}
let parts = parts.unwrap();
let mut g = ColumnSet::new();
g.add_yes(parts.1);
let cols = Box::new(ReaderColumns::new(g));
Ok(Self {
cols,
name: parts.0.to_string(),
delim: delim as u8,
})
}
}
impl<'a> ColumnFun for ColumnClump<'a> {
fn write(&self, w: &mut dyn Write, line: &TextLine, _delim: u8) -> Result<()> {
self.cols.write(w, line, self.delim)?;
Ok(())
}
fn write_names(&self, w: &mut dyn Write, _head: &StringLine, _delim: u8) -> Result<()> {
w.write_all(self.name.as_bytes())?;
Ok(())
}
fn lookup(&mut self, fieldnames: &[&str]) -> Result<()> {
self.cols.lookup(fieldnames)
}
}
/// Selection of columns from a Reader
#[derive(Debug)]
pub struct ReaderColumns {
columns: ColumnSet,
}
impl ReaderColumns {
/// new ReaderColumns
pub fn new(columns: ColumnSet) -> Self {
Self { columns }
}
}
/// Write column name : col.name if non empty, else head[col.num]
pub fn write_colname(w: &mut dyn Write, col: &OutCol, head: &StringLine) -> Result<()> {
if col.name.is_empty() {
w.write_all(head.get(col.num).as_bytes())?;
} else {
w.write_all(col.name.as_bytes())?;
}
Ok(())
}
impl ColumnFun for ReaderColumns {
fn write(&self, w: &mut dyn Write, line: &TextLine, delim: u8) -> Result<()> {
self.columns.write3(w, line, delim)?;
Ok(())
}
fn write_names(&self, w: &mut dyn Write, head: &StringLine, delim: u8) -> Result<()> {
let mut iter = self.columns.get_cols().iter();
match iter.next() {
None => {}
Some(first) => {
write_colname(w, first, head)?;
for x in iter {
w.write_all(&[delim])?;
write_colname(w, x, head)?;
}
}
}
// self.columns.write3s(w, head, delim)?;
Ok(())
}
fn lookup(&mut self, fieldnames: &[&str]) -> Result<()> {
self.columns.lookup(fieldnames)
}More examples
src/join.rs (line 256)
≺ ≻
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pub fn quick_join(&mut self) -> Result<()> {
if self.infiles.len() != 2 {
return err!(
"{} files specified, exactly two required",
self.infiles.len()
);
}
let mut f1 = Reader::new();
let mut f2 = Reader::new();
f1.open(&self.infiles[0])?;
f2.open(&self.infiles[1])?;
if f1.is_empty() && f2.is_empty() {
return Ok(());
}
let mut comp = if self.keys.is_empty() {
make_comp("1")?
} else if self.keys.len() == 1 {
make_comp(&self.keys[0])?
} else {
make_comp(&self.keys[1])?
/*
let mut cc = CompareList::new();
for x in &self.keys {
cc.push(Box::new(make_comp(x)?));
}
cc
*/
};
let mut nomatch: Vec<Option<Outfile>> = vec![None, None];
for x in &self.unmatch_out {
if x.file_num == 1 {
if nomatch[0].is_none() {
let mut w = get_writer(&x.file_name)?;
f1.write_header(&mut w)?;
nomatch[0] = Some(w);
} else {
return err!("Multiple uses of --also for file 1");
}
} else if x.file_num == 2 {
if nomatch[1].is_none() {
let mut w = get_writer(&x.file_name)?;
f2.write_header(&mut w)?;
nomatch[1] = Some(w);
} else {
return err!("Multiple uses of --also for file 2");
}
} else {
return err!(
"Join had 2 input files, but requested non matching lines from file {}",
x.file_num
);
}
}
let mut w = get_writer(&self.match_out)?;
comp.lookup_left(&f1.names())?;
comp.lookup_right(&f2.names())?;
let mut out_cols: Vec<OneOutCol> = Vec::new();
if self.out_cols.is_empty() {
for x in 0..f1.names().len() {
out_cols.push(OneOutCol::new_plain(0, x));
}
for x in 0..f2.names().len() {
if x != comp.mode.right_col.num {
out_cols.push(OneOutCol::new_plain(1, x));
}
}
} else {
for x in &mut self.out_cols {
if x.file == 0 {
x.cols.lookup(&f1.names())?;
} else if x.file == 1 {
x.cols.lookup(&f2.names())?;
} else {
return err!(
"Two input files, but file {} referred to as an output column",
x.file
);
}
for y in x.cols.get_cols() {
out_cols.push(OneOutCol::new(x.file, y));
}
}
}
if out_cols.is_empty() {
return err!("No output columns specified");
}
if f1.cont.has_header {
w.write_all(b" CDX")?;
for x in &out_cols {
w.write_all(&[self.out_delim])?;
x.write_head(&mut w, &f1, &f2)?;
}
w.write_all(&[b'\n'])?;
}
loop {
if f1.is_done() || f2.is_done() {
break;
}
match comp.comp_cols(f1.curr(), f2.curr()) {
Ordering::Equal => {
out_cols[0].write(&mut w, &f1, &f2)?;
for x in &out_cols[1..] {
w.write_all(&[self.out_delim])?;
x.write(&mut w, &f1, &f2)?;
}
w.write_all(&[b'\n'])?;
f1.getline()?;
f2.getline()?;
}
Ordering::Less => {
if let Some(x) = &mut nomatch[0] {
f1.write(x)?;
}
f1.getline()?;
}
Ordering::Greater => {
if let Some(x) = &mut nomatch[1] {
f2.write(x)?;
}
f2.getline()?;
}
}
}
while !f1.is_done() {
if let Some(x) = &mut nomatch[0] {
f1.write(x)?;
}
f1.getline()?;
}
while !f2.is_done() {
if let Some(x) = &mut nomatch[1] {
f2.write(x)?;
}
f2.getline()?;
}
// drain f1 or f2 as needed
Ok(())
}Select columns from input line based on ColumnSet. Fail if input is too short. “”“
Examples
use cdx::column::ColumnSet;
let header: [&str; 5] = ["zero", "one", "two", "three", "four"];
let mut s = ColumnSet::new();
s.add_no("two");
s.lookup(&header);
let v = ["Zeroth", "First", "Second", "Third", "Fourth", "Fifth"];
let mut res = Vec::new();
s.select(&v, &mut res);
assert_eq!(res, vec!["Zeroth", "First", "Third", "Fourth"]);write the appropriate selection from the given columns trying to write a non-existant column is an error
write the appropriate selection from the given columns
write the appropriate selection from the given columns, but no trailing newline
write the appropriate selection from the given columns, but no trailing newline
write the appropriate selection from the given columns, but no trailing newline trying to write a non-existant column writes the provided default value
Select columns from input line based on ColumnSet, fill in default if line is too short “”“
Examples
use cdx::column::ColumnSet;
let header: [&str; 5] = ["zero", "one", "two", "three", "four"];
let mut s = ColumnSet::new();
s.add_no("two");
s.lookup(&header);
let v = ["Zeroth", "First", "Second", "Third"];
let mut res = Vec::new();
s.select_sloppy(&v, &"extra", &mut res);
assert_eq!(res, vec!["Zeroth", "First", "Third", "extra"]);return owned columns by const reference
Examples found in repository
src/column.rs (line 784)
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pub fn lookup1(spec: &str, names: &[&str]) -> Result<usize> {
let mut s = ColumnSet::new();
s.add_yes(spec);
s.lookup(names)?;
if s.get_cols().len() != 1 {
return err!(
"Spec {} resolves to {} columns, rather than a single column",
spec,
s.get_cols().len()
);
}
Ok(s.get_cols_num()[0])
}
}
/// Write the columns with a custom delimiter
pub struct ColumnClump<'a> {
cols: Box<dyn ColumnFun + 'a>,
name: String,
delim: u8,
}
impl fmt::Debug for ColumnClump<'_> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "ColumnClump")
}
}
impl<'a> ColumnClump<'a> {
/// new ColumnClump from parts
pub fn new(cols: Box<dyn ColumnFun + 'a>, name: &str, delim: u8) -> Self {
Self {
cols,
name: name.to_string(),
delim,
}
}
/// new ColumnClump from spec : DelimOutcol:Columns
/// e.g. ,group:1-3
pub fn from_spec(orig_spec: &str) -> Result<Self> {
let mut spec = orig_spec;
if spec.is_empty() {
return err!("Can't construct a group from an empty string");
}
let delim = spec.take_first();
if delim.len_utf8() != 1 {
return err!("Delimiter must be a plain ascii character : {}", orig_spec);
}
let parts = spec.split_once(':');
if parts.is_none() {
return err!(
"No colon found. Group format is DelimOutname:Columns : {}",
orig_spec
);
}
let parts = parts.unwrap();
let mut g = ColumnSet::new();
g.add_yes(parts.1);
let cols = Box::new(ReaderColumns::new(g));
Ok(Self {
cols,
name: parts.0.to_string(),
delim: delim as u8,
})
}
}
impl<'a> ColumnFun for ColumnClump<'a> {
fn write(&self, w: &mut dyn Write, line: &TextLine, _delim: u8) -> Result<()> {
self.cols.write(w, line, self.delim)?;
Ok(())
}
fn write_names(&self, w: &mut dyn Write, _head: &StringLine, _delim: u8) -> Result<()> {
w.write_all(self.name.as_bytes())?;
Ok(())
}
fn lookup(&mut self, fieldnames: &[&str]) -> Result<()> {
self.cols.lookup(fieldnames)
}
}
/// Selection of columns from a Reader
#[derive(Debug)]
pub struct ReaderColumns {
columns: ColumnSet,
}
impl ReaderColumns {
/// new ReaderColumns
pub fn new(columns: ColumnSet) -> Self {
Self { columns }
}
}
/// Write column name : col.name if non empty, else head[col.num]
pub fn write_colname(w: &mut dyn Write, col: &OutCol, head: &StringLine) -> Result<()> {
if col.name.is_empty() {
w.write_all(head.get(col.num).as_bytes())?;
} else {
w.write_all(col.name.as_bytes())?;
}
Ok(())
}
impl ColumnFun for ReaderColumns {
fn write(&self, w: &mut dyn Write, line: &TextLine, delim: u8) -> Result<()> {
self.columns.write3(w, line, delim)?;
Ok(())
}
fn write_names(&self, w: &mut dyn Write, head: &StringLine, delim: u8) -> Result<()> {
let mut iter = self.columns.get_cols().iter();
match iter.next() {
None => {}
Some(first) => {
write_colname(w, first, head)?;
for x in iter {
w.write_all(&[delim])?;
write_colname(w, x, head)?;
}
}
}
// self.columns.write3s(w, head, delim)?;
Ok(())
}More examples
src/join.rs (line 265)
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pub fn quick_join(&mut self) -> Result<()> {
if self.infiles.len() != 2 {
return err!(
"{} files specified, exactly two required",
self.infiles.len()
);
}
let mut f1 = Reader::new();
let mut f2 = Reader::new();
f1.open(&self.infiles[0])?;
f2.open(&self.infiles[1])?;
if f1.is_empty() && f2.is_empty() {
return Ok(());
}
let mut comp = if self.keys.is_empty() {
make_comp("1")?
} else if self.keys.len() == 1 {
make_comp(&self.keys[0])?
} else {
make_comp(&self.keys[1])?
/*
let mut cc = CompareList::new();
for x in &self.keys {
cc.push(Box::new(make_comp(x)?));
}
cc
*/
};
let mut nomatch: Vec<Option<Outfile>> = vec![None, None];
for x in &self.unmatch_out {
if x.file_num == 1 {
if nomatch[0].is_none() {
let mut w = get_writer(&x.file_name)?;
f1.write_header(&mut w)?;
nomatch[0] = Some(w);
} else {
return err!("Multiple uses of --also for file 1");
}
} else if x.file_num == 2 {
if nomatch[1].is_none() {
let mut w = get_writer(&x.file_name)?;
f2.write_header(&mut w)?;
nomatch[1] = Some(w);
} else {
return err!("Multiple uses of --also for file 2");
}
} else {
return err!(
"Join had 2 input files, but requested non matching lines from file {}",
x.file_num
);
}
}
let mut w = get_writer(&self.match_out)?;
comp.lookup_left(&f1.names())?;
comp.lookup_right(&f2.names())?;
let mut out_cols: Vec<OneOutCol> = Vec::new();
if self.out_cols.is_empty() {
for x in 0..f1.names().len() {
out_cols.push(OneOutCol::new_plain(0, x));
}
for x in 0..f2.names().len() {
if x != comp.mode.right_col.num {
out_cols.push(OneOutCol::new_plain(1, x));
}
}
} else {
for x in &mut self.out_cols {
if x.file == 0 {
x.cols.lookup(&f1.names())?;
} else if x.file == 1 {
x.cols.lookup(&f2.names())?;
} else {
return err!(
"Two input files, but file {} referred to as an output column",
x.file
);
}
for y in x.cols.get_cols() {
out_cols.push(OneOutCol::new(x.file, y));
}
}
}
if out_cols.is_empty() {
return err!("No output columns specified");
}
if f1.cont.has_header {
w.write_all(b" CDX")?;
for x in &out_cols {
w.write_all(&[self.out_delim])?;
x.write_head(&mut w, &f1, &f2)?;
}
w.write_all(&[b'\n'])?;
}
loop {
if f1.is_done() || f2.is_done() {
break;
}
match comp.comp_cols(f1.curr(), f2.curr()) {
Ordering::Equal => {
out_cols[0].write(&mut w, &f1, &f2)?;
for x in &out_cols[1..] {
w.write_all(&[self.out_delim])?;
x.write(&mut w, &f1, &f2)?;
}
w.write_all(&[b'\n'])?;
f1.getline()?;
f2.getline()?;
}
Ordering::Less => {
if let Some(x) = &mut nomatch[0] {
f1.write(x)?;
}
f1.getline()?;
}
Ordering::Greater => {
if let Some(x) = &mut nomatch[1] {
f2.write(x)?;
}
f2.getline()?;
}
}
}
while !f1.is_done() {
if let Some(x) = &mut nomatch[0] {
f1.write(x)?;
}
f1.getline()?;
}
while !f2.is_done() {
if let Some(x) = &mut nomatch[1] {
f2.write(x)?;
}
f2.getline()?;
}
// drain f1 or f2 as needed
Ok(())
}steal owned columns by value
Examples found in repository
src/column.rs (line 460)
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pub fn ranges(fieldnames: &[&str], rng: &str) -> Result<Vec<OutCol>> {
let mut c = ColumnSet::new();
c.add_yes(rng);
c.lookup(fieldnames)?;
Ok(c.get_cols_full())
}
/// turn range into list of column numbers
fn range(fieldnames: &[&str], rng: &str) -> Result<Vec<OutCol>> {
if rng.is_empty() {
return err!("Empty Range {}", rng);
}
let (name, range) = match rng.split_once(':') {
None => ("", rng),
Some(x) => x,
};
let ch = range.chars().next().unwrap();
if ch == '<' || ch == '>' || ch == '=' {
return Ok(Self::to_outcols(
&Self::text_range(fieldnames, range)?,
name,
));
}
if range.contains('*') || rng.contains('?') {
return Ok(Self::to_outcols(
&Self::glob_range(fieldnames, range)?,
name,
));
}
let mut parts: Vec<&str> = range.split('-').collect();
if parts.len() > 2 {
return err!("Malformed Range {}", rng);
}
if parts[0].is_empty() {
parts[0] = "1";
}
let start: usize;
let end: usize;
if parts.len() == 1 {
start = Self::single(fieldnames, parts[0])?;
end = start;
} else {
if parts[1].is_empty() {
parts[1] = "+1";
}
start = Self::single(fieldnames, parts[0])?;
end = Self::single(fieldnames, parts[1])?;
}
if start > end {
// throw new CdxException("start > end, i.e. {" + parts.get(0) + " > " + parts.get(1));
return err!("Start greater than end : {}", rng);
}
let mut res = Vec::new();
for i in start..=end {
res.push(OutCol::new(i, name));
}
Ok(res)
}
/// resolve `ColumnSet` in context of the column names from an input file
/// # Examples
///
/// ```
/// use cdx::column::ColumnSet;
/// let header: [&str; 5] = ["zero", "one", "two", "three", "four"];
/// let mut s = ColumnSet::new();
/// s.add_no("two");
/// s.lookup(&header);
/// assert_eq!(s.get_cols_num(), &[0,1,3,4]);
/// ```
pub fn lookup(&mut self, fieldnames: &[&str]) -> Result<()> {
self.did_lookup = true;
self.columns = Vec::new();
let mut no_cols: HashSet<usize> = HashSet::new();
for s in &self.neg {
for x in Self::range(fieldnames, s)? {
no_cols.insert(x.num);
}
}
if self.pos.is_empty() {
for x in 0..fieldnames.len() {
if !no_cols.contains(&x) {
self.columns.push(OutCol::from_num(x));
}
}
} else {
for s in &self.pos {
for x in Self::range(fieldnames, s)? {
if !no_cols.contains(&x.num) {
self.columns.push(x);
}
}
}
}
Ok(())
}
/// Select columns from input line based on `ColumnSet`. Fail if input is too short. """
/// # Examples
///
/// ```
/// use cdx::column::ColumnSet;
/// let header: [&str; 5] = ["zero", "one", "two", "three", "four"];
/// let mut s = ColumnSet::new();
/// s.add_no("two");
/// s.lookup(&header);
/// let v = ["Zeroth", "First", "Second", "Third", "Fourth", "Fifth"];
/// let mut res = Vec::new();
/// s.select(&v, &mut res);
/// assert_eq!(res, vec!["Zeroth", "First", "Third", "Fourth"]);
/// ```
pub fn select<T: AsRef<str> + Clone>(&self, cols: &[T], result: &mut Vec<T>) -> Result<()> {
if !self.did_lookup {
return Err(Error::NeedLookup);
}
result.clear();
for x in &self.columns {
if x.num < cols.len() {
result.push(cols[x.num].clone());
} else {
return err!(
"Line has only {} columns, but column {} was requested.",
cols.len(),
x.num + 1
);
}
}
Ok(())
}
/// write the appropriate selection from the given columns
/// trying to write a non-existant column is an error
pub fn write(&self, w: &mut dyn Write, cols: &[&str], delim: &str) -> Result<()> {
if !self.did_lookup {
return Err(Error::NeedLookup);
}
let mut iter = self.columns.iter();
match iter.next() {
None => {}
Some(first) => {
w.write_all(cols[first.num].as_bytes())?;
for x in iter {
w.write_all(delim.as_bytes())?;
if x.num < cols.len() {
w.write_all(cols[x.num].as_bytes())?;
} else {
return err!(
"Line has only {} columns, but column {} was requested.",
cols.len(),
x.num + 1
);
}
}
}
};
w.write_all(&[b'\n'])?;
Ok(())
}
/// write the appropriate selection from the given columns
pub fn write2(&self, w: &mut dyn Write, cols: &TextLine, delim: u8) -> Result<()> {
if !self.did_lookup {
return Err(Error::NeedLookup);
}
let mut iter = self.columns.iter();
match iter.next() {
None => {}
Some(first) => {
w.write_all(&cols[first.num])?;
for x in iter {
w.write_all(&[delim])?;
w.write_all(cols.get(x.num))?;
}
}
};
w.write_all(&[b'\n'])?;
Ok(())
}
/// write the appropriate selection from the given columns, but no trailing newline
pub fn write3(&self, w: &mut dyn Write, cols: &TextLine, delim: u8) -> Result<()> {
if !self.did_lookup {
return Err(Error::NeedLookup);
}
let mut iter = self.columns.iter();
match iter.next() {
None => {}
Some(first) => {
w.write_all(cols.get(first.num))?;
for x in iter {
w.write_all(&[delim])?;
w.write_all(cols.get(x.num))?;
}
}
};
Ok(())
}
/// write the appropriate selection from the given columns, but no trailing newline
pub fn write3s(&self, w: &mut dyn Write, cols: &StringLine, delim: u8) -> Result<()> {
if !self.did_lookup {
return Err(Error::NeedLookup);
}
let mut iter = self.columns.iter();
match iter.next() {
None => {}
Some(first) => {
w.write_all(cols.get(first.num).as_bytes())?;
for x in iter {
w.write_all(&[delim])?;
w.write_all(cols.get(x.num).as_bytes())?;
}
}
};
Ok(())
}
/// write the appropriate selection from the given columns, but no trailing newline
/// trying to write a non-existant column writes the provided default value
pub fn write_sloppy(&self, cols: &[&str], rest: &str, w: &mut dyn Write) -> Result<()> {
if !self.did_lookup {
return Err(Error::NeedLookup);
}
for x in &self.columns {
if x.num < cols.len() {
w.write_all(cols[x.num].as_bytes())?;
} else {
w.write_all(rest.as_bytes())?;
}
}
Ok(())
}
/// Select columns from input line based on `ColumnSet`, fill in default if line is too short """
/// # Examples
///
/// ```
/// use cdx::column::ColumnSet;
/// let header: [&str; 5] = ["zero", "one", "two", "three", "four"];
/// let mut s = ColumnSet::new();
/// s.add_no("two");
/// s.lookup(&header);
/// let v = ["Zeroth", "First", "Second", "Third"];
/// let mut res = Vec::new();
/// s.select_sloppy(&v, &"extra", &mut res);
/// assert_eq!(res, vec!["Zeroth", "First", "Third", "extra"]);
/// ```
pub fn select_sloppy<T: AsRef<str> + Clone>(
&self,
cols: &[T],
restval: &T,
result: &mut Vec<T>,
) -> Result<()> {
if !self.did_lookup {
return Err(Error::NeedLookup);
}
result.clear();
for x in &self.columns {
if x.num < cols.len() {
result.push(cols[x.num].clone());
} else {
result.push(restval.clone());
}
}
Ok(())
}
/// return owned columns by const reference
pub fn get_cols(&self) -> &Vec<OutCol> {
&self.columns
}
/// steal owned columns by value
pub fn get_cols_full(self) -> Vec<OutCol> {
self.columns
}
/// get owned column numbers
pub fn get_cols_num(&self) -> Vec<usize> {
let mut v = Vec::with_capacity(self.columns.len());
for x in &self.columns {
v.push(x.num);
}
v
}
/// Shorthand to look up some columns
/// # Examples
///
/// ```
/// use cdx::column::ColumnSet;
/// let header: [&str; 5] = ["zero", "one", "two", "three", "four"];
/// assert_eq!(ColumnSet::lookup_cols("~2-3", &header).unwrap(), &[0,3,4]);
/// ```
pub fn lookup_cols(spec: &str, names: &[&str]) -> Result<Vec<usize>> {
let mut s = ColumnSet::new();
s.add_yes(spec);
s.lookup(names)?;
Ok(s.get_cols_num())
}
/// Shorthand to look up some columns, with names
pub fn lookup_cols_full(spec: &str, names: &[&str]) -> Result<Vec<OutCol>> {
let mut s = ColumnSet::new();
s.add_yes(spec);
s.lookup(names)?;
Ok(s.get_cols_full())
}get owned column numbers
Examples found in repository
src/column.rs (line 760)
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pub fn lookup_cols(spec: &str, names: &[&str]) -> Result<Vec<usize>> {
let mut s = ColumnSet::new();
s.add_yes(spec);
s.lookup(names)?;
Ok(s.get_cols_num())
}
/// Shorthand to look up some columns, with names
pub fn lookup_cols_full(spec: &str, names: &[&str]) -> Result<Vec<OutCol>> {
let mut s = ColumnSet::new();
s.add_yes(spec);
s.lookup(names)?;
Ok(s.get_cols_full())
}
/// Shorthand to look up a single column
/// To look up a single named column, `lookup_col` is also available
/// # Examples
///
/// ```
/// use cdx::column::ColumnSet;
/// let header: [&str; 5] = ["zero", "one", "two", "three", "four"];
/// assert_eq!(ColumnSet::lookup1("three", &header).unwrap(), 3);
/// ```
pub fn lookup1(spec: &str, names: &[&str]) -> Result<usize> {
let mut s = ColumnSet::new();
s.add_yes(spec);
s.lookup(names)?;
if s.get_cols().len() != 1 {
return err!(
"Spec {} resolves to {} columns, rather than a single column",
spec,
s.get_cols().len()
);
}
Ok(s.get_cols_num()[0])
}Shorthand to look up some columns
Examples
use cdx::column::ColumnSet;
let header: [&str; 5] = ["zero", "one", "two", "three", "four"];
assert_eq!(ColumnSet::lookup_cols("~2-3", &header).unwrap(), &[0,3,4]);Shorthand to look up some columns, with names
Shorthand to look up a single column
To look up a single named column, lookup_col is also available
Examples
use cdx::column::ColumnSet;
let header: [&str; 5] = ["zero", "one", "two", "three", "four"];
assert_eq!(ColumnSet::lookup1("three", &header).unwrap(), 3);Trait Implementations
Auto Trait Implementations
impl RefUnwindSafe for ColumnSet
impl UnwindSafe for ColumnSet
Blanket Implementations
Mutably borrows from an owned value. Read more