lalrpop 0.12.2

convenient LR(1) parser generator
Documentation 
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use grammar::parse_tree::*;
use grammar::pattern::*;
use lalrpop_util;
use tok;

#[allow(dead_code)]
mod lrgrammar;

pub type ParseError<'input> = lalrpop_util::ParseError<usize, tok::Tok<'input>, tok::Error>;

pub fn parse_grammar<'input>(input: &'input str)
                             -> Result<Grammar, ParseError<'input>>
{
    let tokenizer = tok::Tokenizer::new(input, 0);
    let mut grammar = try!(lrgrammar::parse_Grammar(input, tokenizer));

    // find a unique prefix that does not appear anywhere in the input
    while input.contains(&grammar.prefix) {
        grammar.prefix.push('_');
    }

    Ok(grammar)
}

fn parse_pattern<'input>(input: &'input str, offset: usize)
                         -> Result<Pattern<TypeRef>, ParseError<'input>>
{
    let tokenizer = tok::Tokenizer::new(input, offset);
    lrgrammar::parse_Pattern(input, tokenizer)
}

#[cfg(test)]
pub fn parse_type_ref<'input>(input: &'input str)
                              -> Result<TypeRef, ParseError<'input>>
{
    let tokenizer = tok::Tokenizer::new(input, 0);
    lrgrammar::parse_TypeRef(input, tokenizer)
}