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use anyhow::Context;
use anyhow::Result;
use std::fs::File;
use std::io::BufReader;
use xml::reader::{EventReader, XmlEvent};
#[allow(dead_code)]
#[derive(Debug, Clone)]
pub struct Format {
pub ctype: String,
pub pattern: String,
}
#[allow(dead_code)]
#[derive(Debug, Clone)]
pub struct LineCondition {
pub matchpattern: String,
}
#[allow(dead_code)]
#[derive(Debug, Clone)]
pub struct Cell {
pub name: String,
pub length: usize,
pub start: usize,
pub end: usize,
pub format: Option<Format>,
pub linecondition_type: Option<String>,
pub linecondition_pattern: Option<String>,
pub alignment: String,
pub padcharacter: String,
}
#[derive(Debug, Clone)]
pub struct Line {
pub linetype: String,
pub maxlength: usize,
pub occurs: String,
pub cell: Vec<Cell>,
pub minlength: usize,
pub padcharacter: String,
}
#[derive(Clone, Debug)]
pub struct FixedWidthSchema {
pub lineseparator: String,
pub lines: Vec<Line>,
}
#[allow(dead_code)]
#[derive(Clone, Debug)]
pub struct CsvSchema {
pub lines: Vec<Line>, // TODO: implement CSV schema
}
#[allow(dead_code)]
#[derive(Clone, Debug)]
pub struct Schema {
pub fixedwidthschema: Option<FixedWidthSchema>,
pub csvschema: Option<CsvSchema>, // TODO: implement CSV schema
}
impl Schema {
pub fn load(path: &str) -> Result<Schema> {
let file = File::open(path)?;
let file = BufReader::new(file);
let parser = EventReader::new(file);
let mut schema = Schema {
fixedwidthschema: Some(FixedWidthSchema {
lineseparator: "\n".to_string(),
lines: vec![],
}),
csvschema: None,
};
let mut temp_line = Line {
linetype: String::new(),
maxlength: 0,
occurs: String::new(),
cell: vec![],
minlength: 0,
padcharacter: String::new(),
};
let mut in_line = false;
let mut in_cell = false;
let mut temp_format: Option<Format> = None;
let mut end_cell = 0;
for e in parser {
match e {
Ok(XmlEvent::StartElement {
name, attributes, ..
}) => match name.local_name.as_str() {
"fixedwidthschema" => {
for attr in attributes {
if attr.name.local_name == "lineseparator" {
if let Some(fixed_width_schema) = &mut schema.fixedwidthschema {
fixed_width_schema.lineseparator = attr.value.clone();
}
}
}
}
"line" => {
in_line = true;
temp_line = Line {
linetype: String::new(),
maxlength: 0,
occurs: String::new(),
cell: vec![],
minlength: 0,
padcharacter: String::new(),
};
for attr in attributes {
match attr.name.local_name.as_str() {
"linetype" => temp_line.linetype = attr.value.clone(), // TODO: check unique name
"occurs" => temp_line.occurs = attr.value.clone(), // TODO: not used by the parser yet.
"maxlength" => {
temp_line.maxlength = attr.value.parse().unwrap_or(0)
}
"minlength" => {
// TODO: not used by the parser yet.
temp_line.minlength = attr.value.parse().unwrap_or(0)
}
"padcharacter" => {
// TODO: not used by the parser yet.
temp_line.padcharacter = attr.value.clone()
}
_ => (),
}
}
}
"cell" if in_line => {
in_cell = true;
let mut cell_name = String::new();
let mut cell_length = 0;
let mut cell_alignment = String::new();
let mut cell_padcharacter = String::new();
for attr in attributes {
match attr.name.local_name.as_str() {
"name" => cell_name = attr.value.clone(), // TODO: check unique name
"length" => cell_length = attr.value.parse().unwrap_or(0),
"alignment" => cell_alignment = attr.value.clone(), // TODO: not used by the parser yet.
"padcharacter" => cell_padcharacter = attr.value.clone(), // TODO: not used by the parser yet.
_ => (),
}
}
end_cell += cell_length;
temp_line.cell.push(Cell {
name: cell_name,
length: cell_length,
start: end_cell - cell_length,
end: end_cell,
format: None,
linecondition_type: None,
linecondition_pattern: None,
alignment: cell_alignment,
padcharacter: cell_padcharacter,
});
}
"format" if in_cell => {
let mut ctype = String::new();
let mut pattern = String::new();
for attr in attributes {
match attr.name.local_name.as_str() {
"type" => ctype = attr.value.clone().to_lowercase(),
"pattern" => pattern = attr.value.clone(),
_ => (),
}
}
temp_format = Some(Format { ctype, pattern });
}
"match" if in_cell => {
let mut matchtype = String::new();
let mut matchpattern = String::new();
for attr in attributes {
if attr.name.local_name == "type" {
matchtype = attr.value.clone().to_lowercase();
}
if attr.name.local_name == "pattern" {
matchpattern = attr.value.clone();
}
}
if let Some(cell) = temp_line.cell.last_mut() {
cell.linecondition_type = Some(matchtype);
cell.linecondition_pattern = Some(matchpattern);
}
}
_ => (),
},
Ok(XmlEvent::EndElement { name, .. }) => match name.local_name.as_str() {
"cell" => {
if in_cell {
if let Some(cell) = temp_line.cell.last_mut() {
cell.format = temp_format.take();
}
in_cell = false;
}
}
"line" => {
if in_line {
if let Some(fixed_width_schema) = &mut schema.fixedwidthschema {
fixed_width_schema.lines.push(temp_line.clone());
}
in_line = false;
end_cell = 0;
}
}
_ => (),
},
Err(e) => return Err(e).context("Error parsing XML"),
_ => (),
}
}
Ok(schema)
}
pub fn get_line_conditions(&self) -> Vec<(String, std::vec::Vec<Cell>)> {
let binding = self.get_binding();
binding
.lines
.iter()
.filter_map(|line| {
let cells_with_condition: Vec<_> = line
.cell
.iter()
.filter(|cell| cell.linecondition_pattern.is_some())
.cloned()
.collect();
if cells_with_condition.is_empty() {
None
} else {
Some((line.linetype.clone(), cells_with_condition))
}
})
.collect()
}
pub fn get_first_line_without_condition(&self) -> Option<Line> {
let binding = self.get_binding();
let lines_without_condition: Vec<_> = binding
.lines
.iter()
.filter(|line| {
line.cell
.iter()
.all(|cell| cell.linecondition_pattern.is_none())
})
.cloned()
.collect();
if lines_without_condition.len() > 1 {
// If there is more than one line without conditions, in that case it should return None.
return None;
}
lines_without_condition.first().cloned()
}
pub fn get_schema_type(&self) -> &str {
if self.fixedwidthschema.is_some() {
"fixedwidthschema"
} else {
// TODO: implement more schemes
"csvschema"
// delimitedschema, jsonschema, ...
}
}
pub fn get_line_by_linetype(&self, linetype: &str) -> Option<Line> {
let binding = self.get_binding();
let line = binding
.lines
.iter()
.find(|line| line.linetype == linetype)
.cloned();
line
}
fn get_binding(&self) -> FixedWidthSchema {
// For now it is only implemented for fixed width scheme.
// TODO: implement for CSV schema (should be equal to fixed width)
let fixedwidthschema: &Option<FixedWidthSchema> = &self.fixedwidthschema; // hardcoded to fixed width
let binding: FixedWidthSchema = match fixedwidthschema.clone() {
Some(fixedwidthschema) => fixedwidthschema,
None => todo!("invalid schema"),
};
binding
}
}