use std::fmt;
use super::atom::Atom;
use super::parser;
use super::token::{Token, Tokenizer};
use std::collections::BTreeMap;
use std::io;
#[derive(Debug, PartialEq, Clone)]
pub enum Sexp {
Atom(Atom),
Tuple(Vec<Sexp>),
Array(Vec<Sexp>),
Map(Vec<(Sexp, Sexp)>),
}
impl Sexp {
pub fn is_atom(&self) -> bool {
match self {
&Sexp::Atom(..) => true,
_ => false,
}
}
pub fn is_flat(&self) -> bool {
match self {
&Sexp::Atom(..) => true,
&Sexp::Tuple(ref vec) => vec.iter().all(Sexp::is_atom),
&Sexp::Array(ref vec) => vec.iter().all(Sexp::is_atom),
&Sexp::Map(ref vec) => vec.iter().all(|e| e.0.is_atom() && e.1.is_atom()),
}
}
pub fn into_map(self) -> Result<BTreeMap<String, Sexp>, &'static str> {
match self {
Sexp::Map(pairs) => {
let mut map = BTreeMap::new();
for (key, val) in pairs {
match key {
Sexp::Atom(Atom::Str(s)) => {
if map.insert(s, val).is_some() {
return Err("duplicate key");
}
}
_ => return Err("key has to be a string"),
}
}
return Ok(map);
}
_ => Err("expr is not a Sexp::Map"),
}
}
pub fn get_uint(&self) -> Option<u64> {
match self {
&Sexp::Atom(Atom::UInt(u)) => Some(u),
_ => None,
}
}
pub fn get_int(&self) -> Option<i64> {
match self {
&Sexp::Atom(Atom::SInt(s)) => Some(s),
_ => None,
}
}
pub fn get_float(&self) -> Option<f64> {
match self {
&Sexp::Atom(Atom::Float(f)) => Some(f),
_ => None,
}
}
pub fn get_str(&self) -> Option<&str> {
match self {
&Sexp::Atom(Atom::Str(ref s)) => Some(s),
_ => None,
}
}
pub fn get_vec<'a, F, R>(&'a self, f: F) -> Option<Vec<R>>
where F: Fn(&'a Sexp) -> Option<R>
{
match self {
&Sexp::Array(ref ary) => {
let mut a = Vec::new();
for elm in ary.iter() {
if let Some(u) = f(elm) {
a.push(u);
} else {
return None;
}
}
Some(a)
}
_ => None,
}
}
pub fn get_uint_vec(&self) -> Option<Vec<u64>> {
self.get_vec(|elm| elm.get_uint())
}
pub fn parse_iter<'a, I>(mut iter: I) -> Result<Sexp, ()>
where I: Iterator<Item = Token<'a>>
{
if let Ok(expr) = parser::parse_sexp(&mut iter) {
if parser::at_end(&mut iter) {
return Ok(expr);
}
}
Err(())
}
pub fn parse(s: &str) -> Result<Sexp, ()> {
Sexp::parse_iter(Tokenizer::new(s, true))
}
pub fn parse_toplevel(s: &str) -> Result<Sexp, ()> {
Sexp::parse_iter(Tokenizer::new(s, true).with_curly_around())
}
}
impl<T> From<T> for Sexp where T: Into<Atom>
{
fn from(t: T) -> Sexp {
Sexp::Atom(t.into())
}
}
impl From<()> for Sexp {
fn from(_e: ()) -> Sexp {
Sexp::Tuple(vec![])
}
}
impl<A> From<(A,)> for Sexp where A: Into<Sexp>
{
fn from(e: (A,)) -> Sexp {
Sexp::Tuple(vec![e.0.into()])
}
}
impl<A, B> From<(A, B)> for Sexp
where A: Into<Sexp>,
B: Into<Sexp>
{
fn from(e: (A, B)) -> Sexp {
Sexp::Tuple(vec![e.0.into(), e.1.into()])
}
}
impl<A, B, C> From<(A, B, C)> for Sexp
where A: Into<Sexp>,
B: Into<Sexp>,
C: Into<Sexp>
{
fn from(e: (A, B, C)) -> Sexp {
Sexp::Tuple(vec![e.0.into(), e.1.into(), e.2.into()])
}
}
impl<A, B, C, D> From<(A, B, C, D)> for Sexp
where A: Into<Sexp>,
B: Into<Sexp>,
C: Into<Sexp>,
D: Into<Sexp>
{
fn from(e: (A, B, C, D)) -> Sexp {
Sexp::Tuple(vec![e.0.into(), e.1.into(), e.2.into(), e.3.into()])
}
}
impl<A> From<Vec<A>> for Sexp where A: Into<Sexp>
{
fn from(arr: Vec<A>) -> Sexp {
Sexp::Array(arr.into_iter().map(|e| e.into()).collect())
}
}
pub fn pp(sexp: &Sexp) -> String {
let mut buf = Vec::new();
let _ = prettyprint(sexp, &mut buf, 0, false).unwrap();
String::from_utf8(buf).unwrap()
}
pub fn prettyprint<W: io::Write>(sexp: &Sexp,
f: &mut W,
indent: usize,
newline: bool)
-> Result<(), io::Error> {
use std::cmp;
if newline {
try!(write!(f, "\n"));
for _ in 0..cmp::min(8, indent) {
try!(write!(f, "{:>4}", ""));
}
}
match *sexp {
Sexp::Atom(ref a) => write!(f, "{}", a),
Sexp::Tuple(ref t) => {
try!(write!(f, "("));
for (i, expr) in t.iter().enumerate() {
if i > 0 {
try!(write!(f, " "));
}
try!(prettyprint(expr, f, indent, false));
}
write!(f, ")")
}
Sexp::Array(ref t) => {
if sexp.is_flat() && t.len() < 5 {
write!(f, "{}", sexp)
} else {
try!(write!(f, "["));
for (_, expr) in t.iter().enumerate() {
try!(prettyprint(expr, f, indent + 1, true));
}
write!(f, "]")
}
}
Sexp::Map(ref t) => {
try!(write!(f, "{}", "{"));
for (_, expr) in t.iter().enumerate() {
try!(prettyprint(&expr.0, f, indent + 1, true));
try!(write!(f, " "));
try!(prettyprint(&expr.1, f, indent + 1, false));
}
try!(write!(f, "\n"));
for _ in 0..cmp::min(8, indent) {
try!(write!(f, "{:>4}", ""));
}
write!(f, "{}", "}")
}
}
}
impl fmt::Display for Sexp {
fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
match *self {
Sexp::Atom(ref a) => write!(f, "{}", a),
Sexp::Tuple(ref t) => {
try!(write!(f, "("));
for (i, expr) in t.iter().enumerate() {
let space = if i > 0 {
" "
} else {
""
};
try!(write!(f, "{}{}", space, expr));
}
write!(f, ")")
}
Sexp::Array(ref t) => {
try!(write!(f, "["));
for (i, expr) in t.iter().enumerate() {
let space = if i > 0 {
" "
} else {
""
};
try!(write!(f, "{}{}", space, expr));
}
write!(f, "]")
}
Sexp::Map(ref t) => {
try!(write!(f, "{}", "{"));
for (i, expr) in t.iter().enumerate() {
let space = if i > 0 {
" "
} else {
""
};
try!(write!(f, "{}{} {}", space, expr.0, expr.1));
}
write!(f, "{}", "}")
}
}
}
}
#[test]
fn test_display() {
assert_eq!("12345", &format!("{}", Sexp::Atom(Atom::UInt(12345))));
assert_eq!("1.0", &format!("{}", Sexp::Atom(Atom::Float(1.0))));
assert_eq!("(12345)",
&format!("{}", Sexp::Tuple(vec![Sexp::Atom(Atom::UInt(12345))])));
assert_eq!("(12345 abc)",
&format!("{}",
Sexp::Tuple(vec![Sexp::Atom(Atom::UInt(12345)),
Sexp::Atom(Atom::Str("abc".to_string()))])));
assert_eq!("(12345 (abc))",
&format!("{}",
Sexp::Tuple(vec![Sexp::Atom(Atom::UInt(12345)),
Sexp::Tuple(vec![
Sexp::Atom(Atom::Str("abc".to_string()))
])])));
}
#[test]
fn test_from() {
assert_eq!(Sexp::Atom(Atom::UInt(123)), Sexp::from(123u64));
assert_eq!(Sexp::Atom(Atom::SInt(123)), Sexp::from(123i64));
assert_eq!(Sexp::Atom(Atom::Str("test".to_string())),
Sexp::from("test"));
assert_eq!(Sexp::Atom(Atom::Float(123.45)), Sexp::from(123.45));
assert_eq!(Sexp::Tuple(vec![Sexp::Atom(Atom::Float(123.45))]),
Sexp::from((123.45,)));
assert_eq!(Sexp::Array(vec![Sexp::Atom(Atom::Float(123.45))]),
Sexp::from(vec![123.45]));
}
#[test]
fn test_parse() {
assert_eq!(Ok(Sexp::from(("abc", 123u64, ("-", 123.43, 11.0)))),
Sexp::parse("(abc 123 (- 123.43 11.0))"));
}
#[test]
fn test_parse_toplevel() {
assert_eq!(Sexp::parse("{a 1 b 2}"), Sexp::parse_toplevel("a 1 b 2"));
}
#[test]
fn test_map() {
let map = Sexp::parse("{a 1 b 2}").unwrap().into_map().unwrap();
assert_eq!(true, map.contains_key("a"));
assert_eq!(true, map.contains_key("b"));
assert_eq!(false, map.contains_key("c"));
assert_eq!(Err("duplicate key"),
Sexp::parse("{a 1 b 2 a 1}").unwrap().into_map());
assert_eq!(Err("key has to be a string"),
Sexp::parse("{1 1 b 2 a 1}").unwrap().into_map());
}