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Add trace to binexp parser

This commit is contained in:
greg 2017-09-17 05:06:58 -07:00
parent 9775bfc342
commit 077ab8ddb8
1 changed files with 19 additions and 3 deletions
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22
src/schala_lang/parsing.rs
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@ -376,7 +376,10 @@ impl ParseError {
pub type ParseResult<T> = Result<T, ParseError>;
#[derive(Debug)]
pub struct ParseRecord(String);
pub struct ParseRecord {
production_name: String,
next_token: String,
}
struct Parser {
tokens: TokenIter,
@ -487,7 +490,10 @@ macro_rules! parse_method {
($name:ident(&mut $self:ident) -> $type:ty $body:block) => {
fn $name(&mut $self) -> $type {
let next_token = $self.peek();
let record = ParseRecord(format!("production {}, Token: {:?}", stringify!($name), next_token));
let record = ParseRecord {
production_name: stringify!($name).to_string(),
next_token: format!("{:?}", next_token),
};
$self.parse_record.push(record);
$body
}
@ -566,6 +572,13 @@ impl Parser {
fn precedence_expr(&mut self, precedence: i32) -> ParseResult<Expression> {
use self::Expression::*;
let next_token = self.peek();
let record = ParseRecord {
production_name: "precedence_expr".to_string(),
next_token: format!("{:?}", next_token),
};
self.parse_record.push(record);
//TODO clean this up
let mut lhs = self.primary()?;
loop {
@ -752,7 +765,10 @@ fn parse_binary(digits: String) -> ParseResult<u64> {
pub fn parse(input: Vec<Token>) -> (Result<AST, ParseError>, Vec<String>) {
let mut parser = Parser::new(input);
let ast = parser.program();
let trace = parser.parse_record.into_iter().map(|r| r.0).collect();
let trace = parser.parse_record.into_iter().map(|r| {
format!("Production `{}`, token: {:?}", r.production_name, r.next_token)
}).collect();
(ast, trace)
}