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simple example of custom tokenizer

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This commit is contained in:
Andy Grove 2018-02-09 06:53:49 -07:00
parent fcf6b1150e
commit f56846098e
6 changed files with 145 additions and 29 deletions
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25
src/parser.rs
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@ -1,3 +1,6 @@
use std::cmp::PartialEq;
use std::fmt::Debug;
use super::tokenizer::*;
#[derive(Debug)]
@ -35,23 +38,29 @@ pub enum SQLExpr<T> {
}
#[derive(Debug)]
pub enum ParserError<T> {
WrongToken { expected: Vec<SQLToken<T>>, actual: SQLToken<T>, line: usize, col: usize },
Custom(T)
pub enum ParserError<S, PE>
where S: Debug + PartialEq {
WrongToken { expected: Vec<SQLToken<S>>, actual: SQLToken<S>, line: usize, col: usize },
Custom(PE)
}
impl<T> From<TokenizerError<T>> for ParserError<T> {
fn from(_: TokenizerError<T>) -> Self {
impl<S, TE> From<TokenizerError<TE>> for ParserError<S, TE>
where S: Debug + PartialEq {
fn from(_: TokenizerError<TE>) -> Self {
unimplemented!()
}
}
trait Parser<S, PE> {
trait Parser<S, PE>
where S: Debug + PartialEq {
/// parse the prefix and stop once an infix operator is reached
fn parse_prefix(&mut self) -> Result<Box<SQLExpr<S>>, ParserError<PE>> ;
fn parse_prefix(&mut self) -> Result<Box<SQLExpr<S>>, ParserError<S, PE>> ;
/// parse the next infix expression, returning None if the precedence has changed
fn parse_infix(&mut self, left: SQLExpr<S>) -> Result<Option<Box<SQLExpr<S>>>, ParserError<PE>>;
fn parse_infix(&mut self, left: SQLExpr<S>) -> Result<Option<Box<SQLExpr<S>>>, ParserError<S, PE>>;
}
//