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use pest::Parser;
use crate::lexicon::Lexicon;
use crate::matching::MPMatching;
use crate::segment::MPSegment;
use crate::transform_str::TSParser;
use crate::transform_num::TNParser;
#[derive(Parser)]
#[grammar = "transform.pest"]
pub struct TParser<'a> {
lexicon: &'a Lexicon,
num_parser: TNParser<'a>,
str_parser: TSParser<'a>,
}
impl<'a> TParser<'a> {
pub fn new(lexicon: &'a Lexicon) -> TParser<'a> {
let num_parser = TNParser::new(lexicon);
let str_parser = TSParser::new(lexicon);
TParser {
lexicon, num_parser, str_parser
}
}
pub fn process_transforms(&'a self, source: &'a str, mut matching: MPMatching<'a>) -> MPMatching<'a> {
let mut var: &MPSegment;
let mut val: &MPSegment;
let parse_result = TParser::parse(Rule::transforms, source);
if parse_result.is_err() {
panic!("These do not seem like transforms: \"{}\"\n\nerr: {}\n\nmatching: {:?}", source, parse_result.err().unwrap(), matching);
}
let mut pairs = parse_result.ok().unwrap();
for pair in pairs.next().unwrap().into_inner() {
val = match pair.as_rule() {
Rule::num_transform => {
let mut asspair = pair.into_inner();
let varpair = asspair.next().expect("a variable");
var = self.lexicon.intern("var", varpair.as_str(), true);
let exprpair = asspair.next().expect("an expression");
self.num_parser.compile(exprpair.as_str(), &matching)
},
Rule::str_transform => {
let mut asspair = pair.into_inner();
let varpair = asspair.next().expect("a variable");
var = self.lexicon.intern("var", varpair.as_str(), true);
let exprpair = asspair.next().expect("an expression");
self.str_parser.compile(exprpair.as_str(), &matching)
},
unknown_expr => panic!("Unexpected expression: {:?}", unknown_expr),
};
matching.insert(var, val);
}
matching
}
}