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use range::Range;
use std::rc::Rc;
use {
ret_err,
err_update,
update,
DebugId,
ParseError,
ParseResult,
Rule,
Tokenizer,
TokenizerState,
};
#[derive(Clone)]
pub struct Lines {
pub rule: Rule,
pub debug_id: DebugId,
}
impl Lines {
pub fn parse(
&self,
tokenizer: &mut Tokenizer,
state: &TokenizerState,
mut chars: &[char],
start_offset: usize,
refs: &[(Rc<String>, Rule)]
) -> ParseResult<TokenizerState> {
let mut offset = start_offset;
let mut state = state.clone();
let mut opt_error = None;
let mut new_lines = true;
loop {
let len = chars.iter()
.take_while(|&c| *c != '\n' && c.is_whitespace())
.count();
if len == chars.len() {
offset += len;
break;
} else if chars[len] == '\n' {
chars = &chars[len + 1..];
offset += len + 1;
new_lines |= true;
} else {
if new_lines {
state = match self.rule.parse(
tokenizer, &state, chars, offset, refs) {
Err(err) => {
err_update(Some(err), &mut opt_error);
break;
}
Ok((range, state, err)) => {
let end = range.next_offset() - offset;
let last_new_line = chars[..end].iter()
.rev()
.take_while(|&c| *c != '\n' && c.is_whitespace())
.count();
new_lines =
if end < last_new_line + 1
|| chars[end - last_new_line - 1] != '\n' { false }
else { true };
update(range, err, &mut chars, &mut offset, &mut opt_error);
state
}
};
} else {
let err = (Range::new(offset, 0),
ParseError::ExpectedNewLine(self.debug_id));
return Err(ret_err(err, opt_error));
}
}
}
Ok((Range::new(start_offset, offset - start_offset), state, opt_error))
}
}
#[cfg(test)]
mod tests {
use super::super::*;
use range::Range;
use std::rc::Rc;
#[test]
fn fail() {
let text = "
1
2
3
\"error\"
4
";
let chars: Vec<char> = text.chars().collect();
let mut tokenizer = Tokenizer::new();
let s = TokenizerState::new();
let lines = Lines {
debug_id: 0,
rule: Rule::Number(Number {
debug_id: 1,
property: None,
allow_underscore: false,
}),
};
let res = lines.parse(&mut tokenizer, &s, &chars, 0, &[]);
assert_eq!(res, Ok((Range::new(0, 10), s,
Some((Range::new(10, 0), ParseError::ExpectedNumber(1))))));
}
#[test]
fn fails_same_line() {
let text = "
1
2
3 4
5
";
let chars: Vec<char> = text.chars().collect();
let mut tokenizer = Tokenizer::new();
let s = TokenizerState::new();
let val: Rc<String> = Rc::new("val".into());
let lines = Lines {
debug_id: 0,
rule: Rule::Sequence(Sequence {
debug_id: 1,
args: vec![
Rule::Number(Number {
debug_id: 1,
property: Some(val.clone()),
allow_underscore: false,
}),
Rule::Whitespace(Whitespace {
debug_id: 2,
optional: true,
})
]
}),
};
let res = lines.parse(&mut tokenizer, &s, &chars, 0, &[]);
assert_eq!(res, Err((Range::new(8, 0), ParseError::ExpectedNewLine(0))));
}
#[test]
fn success() {
let text = "
1
2
3
4
";
let chars: Vec<char> = text.chars().collect();
let mut tokenizer = Tokenizer::new();
let s = TokenizerState::new();
let val: Rc<String> = Rc::new("val".into());
let lines = Lines {
debug_id: 0,
rule: Rule::Number(Number {
debug_id: 1,
property: Some(val.clone()),
allow_underscore: false,
}),
};
let res = lines.parse(&mut tokenizer, &s, &chars, 0, &[]);
assert_eq!(res, Ok((Range::new(0, 13), TokenizerState(4), None)));
}
#[test]
fn sequence() {
let text = "
1
2
3
\"one\"
\"two\"
\"three\"
";
let num: Rc<String> = Rc::new("num".into());
let tex: Rc<String> = Rc::new("tex".into());
let rules = Rule::Sequence(Sequence {
debug_id: 0,
args: vec![
Rule::Lines(Box::new(Lines {
debug_id: 1,
rule: Rule::Number(Number {
debug_id: 2,
allow_underscore: true,
property: Some(num.clone()),
})
})),
Rule::Lines(Box::new(Lines {
debug_id: 3,
rule: Rule::Text(Text {
debug_id: 4,
allow_empty: false,
property: Some(tex.clone()),
})
}))
]
});
let res = parse(&rules, &[], text);
assert_eq!(res, Ok(vec![
(Range::new(1, 1), MetaData::F64(num.clone(), 1.0)),
(Range::new(3, 1), MetaData::F64(num.clone(), 2.0)),
(Range::new(5, 1), MetaData::F64(num.clone(), 3.0)),
(Range::new(7, 5), MetaData::String(tex.clone(), "one".into())),
(Range::new(13, 5), MetaData::String(tex.clone(), "two".into())),
(Range::new(19, 7), MetaData::String(tex.clone(), "three".into()))
]));
}
}