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Add ability for dialects to override prefix, infix, and statement par…
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,138 @@ | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| //! Test the ability for dialects to override parsing | ||
|
|
||
| use sqlparser::{ | ||
| ast::{BinaryOperator, Expr, Statement, Value}, | ||
| dialect::Dialect, | ||
| keywords::Keyword, | ||
| parser::{Parser, ParserError}, | ||
| tokenizer::Token, | ||
| }; | ||
|
|
||
| #[test] | ||
| fn custom_prefix_parser() -> Result<(), ParserError> { | ||
| #[derive(Debug)] | ||
| struct MyDialect {} | ||
|
|
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| impl Dialect for MyDialect { | ||
| fn is_identifier_start(&self, ch: char) -> bool { | ||
| is_identifier_start(ch) | ||
| } | ||
|
|
||
| fn is_identifier_part(&self, ch: char) -> bool { | ||
| is_identifier_part(ch) | ||
| } | ||
|
|
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| fn parse_prefix(&self, parser: &mut Parser) -> Option<Result<Expr, ParserError>> { | ||
| if parser.consume_token(&Token::Number("1".to_string(), false)) { | ||
| Some(Ok(Expr::Value(Value::Null))) | ||
| } else { | ||
| None | ||
| } | ||
| } | ||
| } | ||
|
|
||
| let dialect = MyDialect {}; | ||
| let sql = "SELECT 1 + 2"; | ||
| let ast = Parser::parse_sql(&dialect, sql)?; | ||
| let query = &ast[0]; | ||
| assert_eq!("SELECT NULL + 2", &format!("{}", query)); | ||
| Ok(()) | ||
| } | ||
|
|
||
| #[test] | ||
| fn custom_infix_parser() -> Result<(), ParserError> { | ||
| #[derive(Debug)] | ||
| struct MyDialect {} | ||
|
|
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| impl Dialect for MyDialect { | ||
| fn is_identifier_start(&self, ch: char) -> bool { | ||
| is_identifier_start(ch) | ||
| } | ||
|
|
||
| fn is_identifier_part(&self, ch: char) -> bool { | ||
| is_identifier_part(ch) | ||
| } | ||
|
|
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| fn parse_infix( | ||
| &self, | ||
| parser: &mut Parser, | ||
| expr: &Expr, | ||
| _precendence: u8, | ||
| ) -> Option<Result<Expr, ParserError>> { | ||
| if parser.consume_token(&Token::Plus) { | ||
| Some(Ok(Expr::BinaryOp { | ||
| left: Box::new(expr.clone()), | ||
| op: BinaryOperator::Multiply, // translate Plus to Multiply | ||
| right: Box::new(parser.parse_expr().unwrap()), | ||
| })) | ||
| } else { | ||
| None | ||
| } | ||
| } | ||
| } | ||
|
|
||
| let dialect = MyDialect {}; | ||
| let sql = "SELECT 1 + 2"; | ||
| let ast = Parser::parse_sql(&dialect, sql)?; | ||
| let query = &ast[0]; | ||
| assert_eq!("SELECT 1 * 2", &format!("{}", query)); | ||
| Ok(()) | ||
| } | ||
|
|
||
| #[test] | ||
| fn custom_statement_parser() -> Result<(), ParserError> { | ||
| #[derive(Debug)] | ||
| struct MyDialect {} | ||
|
|
||
| impl Dialect for MyDialect { | ||
| fn is_identifier_start(&self, ch: char) -> bool { | ||
| is_identifier_start(ch) | ||
| } | ||
|
|
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| fn is_identifier_part(&self, ch: char) -> bool { | ||
| is_identifier_part(ch) | ||
| } | ||
|
|
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| fn parse_statement(&self, parser: &mut Parser) -> Option<Result<Statement, ParserError>> { | ||
| if parser.parse_keyword(Keyword::SELECT) { | ||
| for _ in 0..3 { | ||
| let _ = parser.next_token(); | ||
| } | ||
| Some(Ok(Statement::Commit { chain: false })) | ||
| } else { | ||
| None | ||
| } | ||
| } | ||
| } | ||
|
|
||
| let dialect = MyDialect {}; | ||
| let sql = "SELECT 1 + 2"; | ||
| let ast = Parser::parse_sql(&dialect, sql)?; | ||
| let query = &ast[0]; | ||
| assert_eq!("COMMIT", &format!("{}", query)); | ||
| Ok(()) | ||
| } | ||
|
|
||
| fn is_identifier_start(ch: char) -> bool { | ||
| ('a'..='z').contains(&ch) || ('A'..='Z').contains(&ch) || ch == '_' | ||
| } | ||
|
|
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| fn is_identifier_part(ch: char) -> bool { | ||
| ('a'..='z').contains(&ch) | ||
| || ('A'..='Z').contains(&ch) | ||
| || ('0'..='9').contains(&ch) | ||
| || ch == '$' | ||
| || ch == '_' | ||
| } |