49 lines
2.2 KiB
Rust
49 lines
2.2 KiB
Rust
|
use crate::parser::{NyashParser, ParseError};
|
||
|
|
use crate::parser::common::ParserUtils;
|
||
|
|
use crate::tokenizer::TokenType;
|
||
|
|
use crate::ast::{ASTNode, BinaryOperator, Span};
|
||
|
|
|
||
|
|
impl NyashParser {
|
||
|
|
pub(crate) fn expr_parse_equality(&mut self) -> Result<ASTNode, ParseError> {
|
||
|
|
let mut expr = self.expr_parse_comparison()?;
|
||
|
|
while self.match_token(&TokenType::EQUALS) || self.match_token(&TokenType::NotEquals) {
|
||
|
|
let operator = match &self.current_token().token_type {
|
||
|
|
TokenType::EQUALS => BinaryOperator::Equal,
|
||
|
|
TokenType::NotEquals => BinaryOperator::NotEqual,
|
||
|
|
_ => unreachable!(),
|
||
|
|
};
|
||
|
|
self.advance();
|
||
|
|
let right = self.expr_parse_comparison()?;
|
||
|
|
if std::env::var("NYASH_GRAMMAR_DIFF").ok().as_deref() == Some("1") {
|
||
|
|
let name = match operator { BinaryOperator::Equal=>"eq", BinaryOperator::NotEqual=>"ne", _=>"cmp" };
|
||
|
|
let ok = crate::grammar::engine::get().syntax_is_allowed_binop(name);
|
||
|
|
if !ok { eprintln!("[GRAMMAR-DIFF][Parser] binop '{}' not allowed by syntax rules", name); }
|
||
|
|
}
|
||
|
|
expr = ASTNode::BinaryOp { operator, left: Box::new(expr), right: Box::new(right), span: Span::unknown() };
|
||
|
|
}
|
||
|
|
Ok(expr)
|
||
|
|
}
|
||
|
|
|
||
|
|
pub(crate) fn expr_parse_comparison(&mut self) -> Result<ASTNode, ParseError> {
|
||
|
|
let mut expr = self.expr_parse_range()?;
|
||
|
|
while self.match_token(&TokenType::LESS)
|
||
|
|
|| self.match_token(&TokenType::LessEquals)
|
||
|
|
|| self.match_token(&TokenType::GREATER)
|
||
|
|
|| self.match_token(&TokenType::GreaterEquals)
|
||
|
|
{
|
||
|
|
let operator = match &self.current_token().token_type {
|
||
|
|
TokenType::LESS => BinaryOperator::Less,
|
||
|
|
TokenType::LessEquals => BinaryOperator::LessEqual,
|
||
|
|
TokenType::GREATER => BinaryOperator::Greater,
|
||
|
|
TokenType::GreaterEquals => BinaryOperator::GreaterEqual,
|
||
|
|
_ => unreachable!(),
|
||
|
|
};
|
||
|
|
self.advance();
|
||
|
|
let right = self.expr_parse_range()?;
|
||
|
|
expr = ASTNode::BinaryOp { operator, left: Box::new(expr), right: Box::new(right), span: Span::unknown() };
|
||
|
|
}
|
||
|
|
Ok(expr)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|