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Refactoring

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This commit is contained in:
Andy Grove 2018-09-03 07:45:48 -06:00
parent 037ebb0f73
commit fa2ef528b7
2 changed files with 36 additions and 22 deletions
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52
examples/acme_parser.rs
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@ -36,27 +36,33 @@ impl SQLTokenizer<AcmeToken> for AcmeTokenizer {
}
fn next_token(&mut self, chars: &mut CharSeq) -> Result<Option<SQLToken<AcmeToken>>, TokenizerError> {
// let mut arc = self.ansi_tokenizer.lock().unwrap();
// match arc.peek_char() {
// Some(&ch) => match ch {
// '!' => {
// arc.next_char(); // consume the first `!`
// match arc.peek_char() {
// Some(&ch) => match ch {
// '!' => {
// arc.next_char(); // consume the second `!`
// Ok(Some(SQLToken::Custom(AcmeToken::Factorial)))
// },
// _ => Err(TokenizerError::UnexpectedChar(ch,Position::new(0,0)))
// },
// None => Ok(Some(SQLToken::Not))
// }
// }
// _ => arc.next_token()
// }
// _ => arc.next_token()
// }
unimplemented!()
let mut ansi = self.ansi_tokenizer.lock().unwrap();
match chars.peek() {
Some(&ch) => match ch {
'!' => {
chars.mark();
chars.next(); // consume the first `!`
match chars.peek() {
Some(&ch) => match ch {
'!' => {
chars.next(); // consume the second `!`
Ok(Some(SQLToken::Custom(AcmeToken::Factorial)))
},
_ => {
chars.reset();
ansi.next_token(chars)
}
},
None => {
chars.reset();
ansi.next_token(chars)
}
}
}
_ => ansi.next_token(chars)
}
_ => ansi.next_token(chars)
}
}
}
@ -99,7 +105,9 @@ fn main() {
let ansi_parser = Arc::new(Mutex::new(ANSISQLParser::new(acme_tokenizer.clone())));
let acme_parser = Arc::new(Mutex::new(AcmeParser::new(acme_tokenizer.clone())));
//let parser_list: Vec<Arc<Mutex<SQLParser<>>>> = vec![acme_parser, ansi_parser];
// ansi_parser.lock().unwrap().next_token();
//let parser_list = vec![acme_parser, ansi_parser];
// Custom ACME parser
// let acme_parser: Arc<Mutex<SQLParser<AcmeToken, AcmeExpr>>> = Arc::new(Mutex::new(AcmeParser {

6
src/parser.rs
View file

@ -113,6 +113,12 @@ pub trait SQLParser<TokenType, ExprType>
fn parse_infix(&mut self, chars: &mut CharSeq, left: &SQLExpr<ExprType>, precedence: usize) -> Result<Option<Box<SQLExpr<ExprType>>>, ParserError<TokenType>>;
}
//struct PrattParser<ExprType, TokenType> {
//
// ansi_parser:
//
//}
//
//pub fn parse_expr<'a, TokenType, ExprType>(parser: Arc<Mutex<SQLParser<TokenType, ExprType>>>)
// -> Result<Box<SQLExpr<ExprType>>, ParserError<TokenType>> where TokenType: Debug + PartialEq, ExprType: Debug {