jexl_parser/
lib.rs

1/* This Source Code Form is subject to the terms of the Mozilla Public
2 * License, v. 2.0. If a copy of the MPL was not distributed with this
3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
4
5pub mod ast;
6pub mod lexer;
7#[rustfmt::skip]
8mod parser;
9
10pub use crate::lexer::{LexError, Token};
11pub use lalrpop_util::ParseError;
12
13pub struct Parser {}
14
15impl Parser {
16    pub fn parse(input: &str) -> Result<ast::Expression, ParseError<usize, Token, LexError>> {
17        let lexer = lexer::Lexer::new(input);
18        Ok(*parser::ExpressionParser::new().parse(lexer)?)
19    }
20}
21
22#[cfg(test)]
23mod tests {
24    use super::*;
25    use crate::ast::{Expression, OpCode};
26
27    #[test]
28    fn literal() {
29        assert_eq!(Parser::parse("1"), Ok(Expression::Number(1.0)));
30    }
31
32    #[test]
33    fn binary_expression() {
34        assert_eq!(
35            Parser::parse("1+2"),
36            Ok(Expression::BinaryOperation {
37                operation: OpCode::Add,
38                left: Box::new(Expression::Number(1.0)),
39                right: Box::new(Expression::Number(2.0)),
40            }),
41        );
42    }
43
44    #[test]
45    fn binary_expression_whitespace() {
46        assert_eq!(Parser::parse("1  +     2 "), Parser::parse("1+2"),);
47    }
48
49    #[test]
50    fn transform_simple_no_args() {
51        let exp = "'T_T'|lower";
52        let parsed = Parser::parse(exp).unwrap();
53        assert_eq!(
54            parsed,
55            Expression::Transform {
56                name: "lower".to_string(),
57                subject: Box::new(Expression::String("T_T".to_string())),
58                args: None
59            }
60        );
61    }
62
63    #[test]
64    fn transform_multiple_args() {
65        let exp = "'John Doe'|split(' ')";
66        let parsed = Parser::parse(exp).unwrap();
67        assert_eq!(
68            parsed,
69            Expression::Transform {
70                name: "split".to_string(),
71                subject: Box::new(Expression::String("John Doe".to_string())),
72                args: Some(vec![Box::new(Expression::String(" ".to_string()))])
73            }
74        );
75    }
76
77    #[test]
78    fn trasform_way_too_many_args() {
79        let exp = "123456|math(12, 35, 100, 31, 90)";
80        let parsed = Parser::parse(exp).unwrap();
81        assert_eq!(
82            parsed,
83            Expression::Transform {
84                name: "math".to_string(),
85                subject: Box::new(Expression::Number(123_456f64)),
86                args: Some(vec![
87                    Box::new(Expression::Number(12f64)),
88                    Box::new(Expression::Number(35f64)),
89                    Box::new(Expression::Number(100f64)),
90                    Box::new(Expression::Number(31f64)),
91                    Box::new(Expression::Number(90f64)),
92                ])
93            }
94        );
95    }
96
97    #[test]
98    fn test_index_op_ident() {
99        let exp = "foo[0]";
100        let parsed = Parser::parse(exp).unwrap();
101        assert_eq!(
102            parsed,
103            Expression::IndexOperation {
104                subject: Box::new(Expression::Identifier("foo".to_string())),
105                index: Box::new(Expression::Number(0f64))
106            }
107        );
108    }
109
110    #[test]
111    fn test_index_op_array_literal() {
112        let exp = "[1, 2, 3][0]";
113        let parsed = Parser::parse(exp).unwrap();
114        assert_eq!(
115            parsed,
116            Expression::IndexOperation {
117                subject: Box::new(Expression::Array(vec![
118                    Box::new(Expression::Number(1f64)),
119                    Box::new(Expression::Number(2f64)),
120                    Box::new(Expression::Number(3f64)),
121                ])),
122                index: Box::new(Expression::Number(0f64))
123            }
124        );
125    }
126
127    #[test]
128    fn test_dot_op_ident() {
129        let exp = "foo.bar";
130        let parsed = Parser::parse(exp).unwrap();
131        assert_eq!(
132            parsed,
133            Expression::DotOperation {
134                subject: Box::new(Expression::Identifier("foo".to_string())),
135                ident: "bar".to_string()
136            }
137        );
138    }
139
140    #[test]
141    fn test_dot_op_equality_with_null() {
142        let exp = "foo.bar == null";
143        let parsed = Parser::parse(exp).unwrap();
144        assert_eq!(
145            parsed,
146            Expression::BinaryOperation {
147                operation: OpCode::Equal,
148                left: Box::new(Expression::DotOperation {
149                    subject: Box::new(Expression::Identifier("foo".to_string())),
150                    ident: "bar".to_string()
151                }),
152                right: Box::new(Expression::Null),
153            }
154        );
155    }
156
157    #[test]
158    fn test_dot_op_object_literal() {
159        let exp = "{'foo': 1}.foo";
160        let parsed = Parser::parse(exp).unwrap();
161        assert_eq!(
162            parsed,
163            Expression::DotOperation {
164                subject: Box::new(Expression::Object(vec![(
165                    "foo".to_string(),
166                    Box::new(Expression::Number(1f64))
167                )])),
168                ident: "foo".to_string()
169            }
170        );
171    }
172
173    #[test]
174    fn test_parsing_null() {
175        assert_eq!(Parser::parse("null"), Ok(Expression::Null));
176    }
177
178    #[test]
179    fn test_empty_object_literal() {
180        let exp = "{}";
181        let parsed = Parser::parse(exp).unwrap();
182        assert_eq!(parsed, Expression::Object(vec![]));
183    }
184}
jexl_parser/lib.rs

jexl_parser/
lib.rs
