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use crate::{VojaqField, VojaqLine, VojaqSet};
use std::iter::Peekable;
use std::str::Chars;
#[derive(PartialEq, Eq, Debug)]
enum VariantParsingState {
StartNewLine(String),
StartNewField(String),
NewVariant(String),
Done(String)
}
#[derive(PartialEq, Eq, Debug)]
enum FieldParsingState {
StartNewLine(VojaqField),
NewField(VojaqField),
Done(VojaqField)
}
#[derive(PartialEq, Eq, Debug)]
enum LineParsingState {
NewLine(VojaqLine),
Done(VojaqLine)
}
struct VojaqParser<'a> {
it : Peekable<Chars<'a>>
}
pub fn parse_vojaq(text: &str) -> VojaqSet {
VojaqParser::new(text).parse_text()
}
impl<'a> VojaqParser<'a> {
pub fn new(text: &'a str) -> VojaqParser<'a> {
VojaqParser {
it : text.chars().peekable()
}
}
pub fn parse_text(&mut self) -> VojaqSet {
let mut set = VojaqSet::new();
loop {
match self.parse_line() {
LineParsingState::NewLine(line) => {
set.push(line);
},
LineParsingState::Done(line) => {
set.push(line);
return set;
}
}
}
}
fn parse_line(&mut self) -> LineParsingState {
let mut line = VojaqLine::new();
loop {
match self.parse_field() {
FieldParsingState::NewField(field) => {
line.push(field);
},
FieldParsingState::StartNewLine(field) => {
line.push(field);
return LineParsingState::NewLine(line);
},
FieldParsingState::Done(field) => {
line.push(field);
return LineParsingState::Done(line);
}
}
}
}
fn parse_field(&mut self) -> FieldParsingState {
let mut field = VojaqField::new();
loop {
match self.parse_variant() {
VariantParsingState::NewVariant(variant) => {
field.push(variant);
},
VariantParsingState::StartNewField(variant) => {
field.push(variant);
return FieldParsingState::NewField(field);
},
VariantParsingState::StartNewLine(variant) => {
field.push(variant);
return FieldParsingState::StartNewLine(field);
},
VariantParsingState::Done(variant) => {
field.push(variant);
return FieldParsingState::Done(field);
}
}
}
}
fn parse_variant(&mut self) -> VariantParsingState {
let mut variant = String::new();
while let Some(c) = self.it.next() {
match c {
'|' => return VariantParsingState::NewVariant(variant),
'{' | '}' => return VariantParsingState::StartNewField(variant),
'\n' => return VariantParsingState::StartNewLine(variant),
c => variant.push(c)
}
}
VariantParsingState::Done(variant)
}
}