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Refactoring

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This commit is contained in:
Andy Grove 2018-09-02 19:15:07 -06:00
parent 2e20b15c2e
commit 037ebb0f73
4 changed files with 22 additions and 17 deletions
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4
src/parser.rs
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@ -1,7 +1,5 @@
use std::cmp::PartialEq;
use std::fmt::Debug;
use std::rc::Rc;
use std::sync::{Arc, Mutex};
use super::tokenizer::*;
@ -110,7 +108,7 @@ pub trait SQLParser<TokenType, ExprType>
where TokenType: Debug + PartialEq, ExprType: Debug {
/// parse the prefix and stop once an infix operator is reached
fn parse_prefix(&mut self, chars: &mut CharSeq) -> Result<Box<SQLExpr<ExprType>>, ParserError<TokenType>> ;
fn parse_prefix(&mut self, chars: &mut CharSeq) -> Result<Option<Box<SQLExpr<ExprType>>>, ParserError<TokenType>> ;
/// parse the next infix expression, returning None if the precedence has changed
fn parse_infix(&mut self, chars: &mut CharSeq, left: &SQLExpr<ExprType>, precedence: usize) -> Result<Option<Box<SQLExpr<ExprType>>>, ParserError<TokenType>>;
}