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Switch to pratt parser

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This commit is contained in:
Joscha 2022-11-01 14:55:08 +01:00
parent f01c3818c0
commit 11d9a2f1c7
1 changed files with 13 additions and 14 deletions
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27
src/files/parse.rs
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@ -4,7 +4,7 @@ use std::result;
use chrono::NaiveDate;
use pest::error::ErrorVariant;
use pest::iterators::Pair;
use pest::prec_climber::{Assoc, Operator, PrecClimber};
use pest::pratt_parser::{Assoc, Op, PrattParser};
use pest::{Parser, Span};
use super::commands::{
@ -429,21 +429,20 @@ fn parse_op(l: Spanned<Expr>, p: Pair<'_, Rule>, r: Spanned<Expr>) -> Spanned<Ex
fn parse_expr(p: Pair<'_, Rule>) -> Spanned<Expr> {
assert_eq!(p.as_rule(), Rule::expr);
fn op(rule: Rule) -> Operator<Rule> {
Operator::new(rule, Assoc::Left)
fn infl(rule: Rule) -> Op<Rule> {
Op::infix(rule, Assoc::Left)
}
let climber = PrecClimber::new(vec![
// Precedence from low to high
op(Rule::op_or) | op(Rule::op_xor),
op(Rule::op_and),
op(Rule::op_eq) | op(Rule::op_neq),
op(Rule::op_lt) | op(Rule::op_lte) | op(Rule::op_gt) | op(Rule::op_gte),
op(Rule::op_mul) | op(Rule::op_div) | op(Rule::op_mod),
op(Rule::op_add) | op(Rule::op_sub),
]);
climber.climb(p.into_inner(), parse_term, parse_op)
PrattParser::new()
.op(infl(Rule::op_or) | infl(Rule::op_xor))
.op(infl(Rule::op_and))
.op(infl(Rule::op_eq) | infl(Rule::op_neq))
.op(infl(Rule::op_lt) | infl(Rule::op_lte) | infl(Rule::op_gt) | infl(Rule::op_gte))
.op(infl(Rule::op_mul) | infl(Rule::op_div) | infl(Rule::op_mod))
.op(infl(Rule::op_add) | infl(Rule::op_sub))
.map_primary(parse_term)
.map_infix(parse_op)
.parse(p.into_inner())
}
fn parse_date_expr_start(p: Pair<'_, Rule>, spec: &mut FormulaSpec) -> Result<()> {