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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::tag::Tag;
pub use self::until_any::UntilAny;
pub use self::until_any_or_whitespace::UntilAnyOrWhitespace;
pub use self::whitespace::Whitespace;
use range::Range;
use read_token::ReadToken;
use {
MetaData,
ParseError,
Syntax,
};
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 tag;
mod until_any;
mod until_any_or_whitespace;
mod whitespace;
pub fn parse(
rules: &Syntax,
text: &str,
tokens: &mut Vec<Range<MetaData>>
) -> Result<(), Range<ParseError>> {
let s = TokenizerState(tokens.len());
let n = match rules.rules.len() {
0 => { return Err(Range::empty(0).wrap(ParseError::NoRules)); }
x => x
};
let read_token = ReadToken::new(&text, 0);
let res = rules.rules[n - 1].parse(tokens, &s, &read_token, &rules.rules);
match res {
Ok((range, s, opt_error)) => {
if range.next_offset() < text.chars().count() {
Err(ret_err(
Range::empty(range.next_offset()).wrap(
ParseError::ExpectedEnd),
opt_error
))
} else {
tokens.truncate(s.0);
Ok(())
}
}
Err(range_err) => Err(range_err)
}
}
pub fn parse_errstr(
rules: &Syntax,
text: &str,
tokens: &mut Vec<Range<MetaData>>
) -> Result<(), String> {
use ParseErrorHandler;
match parse(rules, text, tokens) {
Ok(()) => Ok(()),
Err(range_err) => {
let mut w: Vec<u8> = vec![];
ParseErrorHandler::new(&text).write(&mut w, range_err).unwrap();
Err(String::from_utf8(w).unwrap())
}
}
}
pub fn update_refs(&mut Syntax { ref mut rules, ref names }: &mut Syntax) {
for r in rules {
r.update_refs(names);
}
}
pub type ParseResult<S> = Result<(Range, S, Option<Range<ParseError>>),
Range<ParseError>>;
#[inline(always)]
fn update<'a>(
range: Range,
err: Option<Range<ParseError>>,
read_token: &mut ReadToken<'a>,
opt_error: &mut Option<Range<ParseError>>
) {
*read_token = read_token.consume(range.length);
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.next_offset() <= err.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.next_offset() > a.next_offset() {
b
} else {
a
}
} else {
a
}
}
#[cfg(test)]
mod tests{
use range::Range;
use all::*;
#[test]
fn no_rules() {
assert_eq!(parse(&Syntax::new(), "", &mut vec![]),
Err(Range::empty(0).wrap(ParseError::NoRules)));
}
}