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pub use self::lines::Lines;
pub use self::node::Node;
pub use self::number::Number;
pub use self::optional::Optional;
pub use self::repeat::Repeat;
pub use self::rule::Rule;
pub use self::select::Select;
pub use self::separate_by::SeparateBy;
pub use self::sequence::Sequence;
pub use self::text::Text;
pub use self::token::Token;
pub use self::until_any::UntilAny;
pub use self::until_any_or_whitespace::UntilAnyOrWhitespace;
pub use self::whitespace::Whitespace;
use std::rc::Rc;
use range::Range;
use {
MetaData,
ParseError,
};
use tokenizer::TokenizerState;
mod lines;
mod node;
mod number;
mod optional;
mod repeat;
mod rule;
mod select;
mod separate_by;
mod sequence;
mod text;
mod token;
mod until_any;
mod until_any_or_whitespace;
mod whitespace;
pub fn parse(
rules: &[(Rc<String>, Rule)],
text: &str
) -> Result<Vec<(Range, MetaData)>, (Range, ParseError)> {
let chars: Vec<char> = text.chars().collect();
let mut tokens = vec![];
let s = TokenizerState::new();
let n = match rules.len() {
0 => { return Err((Range::empty(0), ParseError::NoRules)); }
x => x
};
let res = rules[n - 1].1.parse(&mut tokens, &s, &chars, 0, rules);
match res {
Ok((range, s, opt_error)) => {
if range.next_offset() < text.chars().count() {
Err(ret_err(
(Range::empty(range.next_offset()),
ParseError::ExpectedEnd),
opt_error
))
} else {
tokens.truncate(s.0);
Ok(tokens)
}
}
Err((err_range, err)) => {
Err((err_range, err))
}
}
}
pub fn update_refs(rules: &[(Rc<String>, Rule)]) {
for r in rules {
r.1.update_refs(rules);
}
}
pub type ParseResult<S> = Result<(Range, S, Option<(Range, ParseError)>),
(Range, ParseError)>;
#[inline(always)]
fn update<'a>(
range: Range,
err: Option<(Range, ParseError)>,
chars: &mut &'a [char],
offset: &mut usize,
opt_error: &mut Option<(Range, ParseError)>
) {
let next_offset = range.next_offset();
*chars = &chars[next_offset - *offset..];
*offset = next_offset;
err_update(err, opt_error);
}
#[inline(always)]
fn err_update(
err: Option<(Range, ParseError)>,
opt_error: &mut Option<(Range, ParseError)>
) {
if let &mut Some(ref mut opt_error) = opt_error {
if let Some(err) = err {
if opt_error.0.next_offset() <= err.0.next_offset() {
*opt_error = err;
}
}
} else {
*opt_error = err;
};
}
#[inline(always)]
fn ret_err(a: (Range, ParseError), b: Option<(Range, ParseError)>) ->
(Range, ParseError) {
if let Some(b) = b {
if b.0.next_offset() > a.0.next_offset() {
b
} else {
a
}
} else {
a
}
}
#[cfg(test)]
mod tests{
use range::Range;
use all::*;
#[test]
fn no_rules() {
assert_eq!(parse(&[], ""),
Err((Range::empty(0), ParseError::NoRules)));
}
}