powr_parser/
lib.rs

1use pest_derive::Parser;
2
3#[derive(Parser)]
4#[grammar = "grammar.pest"]
5struct JavaScriptParser;
6
7#[cfg(test)]
8mod tests {
9    use crate::*;
10    use pest::Parser;
11
12    fn parse(input: &str) {
13        JavaScriptParser::parse(Rule::program, input).unwrap();
14    }
15
16    fn parse_rule(input: &str, rule: Rule) {
17        JavaScriptParser::parse(rule, input).unwrap();
18    }
19
20    #[test]
21    fn it_works() {
22        parse("1 + 1;")
23    }
24
25    #[test]
26    fn booleans() {
27        parse("true;");
28        parse("false;");
29    }
30
31    #[test]
32    fn boolean_checking() {
33        parse("true == true;");
34        parse("true == false;");
35        parse("false == true;");
36        parse("false == false;");
37    }
38
39    #[test]
40    fn scientific_notation() {
41        parse("1e1;");
42        parse("1e-1;");
43        parse("1e+1;");
44        parse("1e0;");
45        parse("1e-0;");
46        parse("1e+0;");
47    }
48
49    #[test]
50    fn arrays() {
51        parse("[];");
52        parse("[1];");
53        parse("[1, 2];");
54        parse("[1, 2, 3];");
55    }
56
57    #[test]
58    fn objects() {
59        parse("{};");
60        parse("{a: 1};");
61        parse("{a: 1, b: 2};");
62        parse("{a: 1, b: 2, c: 3};");
63        parse("({a: 1, b: 2, c: 3});");
64    }
65
66    #[test]
67    fn functions() {
68        parse("function() {}");
69        parse("function() { return 1; }");
70        parse("function sum(a, b) { return a + b; }");
71    }
72
73    #[test]
74    fn assignments() {
75        parse("const a;");
76        parse("const a = b;");
77        parse("let c = d;");
78        parse("var e = f;");
79        parse("foo = bar");
80        parse("foo += bar");
81        parse("foo -= bar");
82        parse("foo *= bar");
83        parse("foo /= bar");
84        parse("foo %= bar");
85        parse("foo **= bar");
86        parse("foo <<= bar");
87        parse("foo >>= bar");
88        parse("foo >>>= bar");
89        parse("foo &= bar");
90        parse("foo ^= bar");
91        parse("foo |= bar");
92    }
93
94    #[test]
95    fn operators() {
96        parse_rule("1 + 1", Rule::expression);
97        parse_rule("1 - 1", Rule::expression);
98        parse_rule("1 * 1", Rule::expression);
99        parse_rule("1 / 1;", Rule::expression);
100        parse_rule("1 % 1;", Rule::expression);
101        parse_rule("1 ** 1;", Rule::expression);
102        parse_rule("1 << 1;", Rule::expression);
103        parse_rule("1 >> 1;", Rule::expression);
104        parse_rule("1 >>> 1;", Rule::expression);
105        parse_rule("1 & 1;", Rule::expression);
106        parse_rule("1 | 1;", Rule::expression);
107        parse_rule("1 ^ 1;", Rule::expression);
108        parse_rule("1 && 1;", Rule::expression);
109        parse_rule("1 || 1;", Rule::expression);
110        parse_rule("1 ?? 1;", Rule::expression);
111        parse_rule("1 == 1;", Rule::expression);
112        parse_rule("1 === 1;", Rule::expression);
113        parse_rule("1 != 1;", Rule::expression);
114        parse_rule("1 !== 1;", Rule::expression);
115        parse_rule("1 < 1;", Rule::expression);
116        parse_rule("1 <= 1;", Rule::expression);
117        parse_rule("1 > 1;", Rule::expression);
118        parse_rule("1 >= 1;", Rule::expression);
119    }
120
121    #[test]
122    fn new_lines() {
123        parse("function append(a, b) {\nreturn a + b;\n}");
124    }
125
126    #[test]
127    fn arrow_function() {
128        parse("const sum = (a, b) => a + b;");
129        parse("const sum = (a, b) => {\nreturn a + b;\n}");
130    }
131
132    #[test]
133    fn if_statements() {
134        parse("if (true) { return 1; }");
135        parse("if (false) { return 1; }");
136        parse("if (true) { return 1; } else { return 2; }");
137        parse("if (true) { return 1; } else if (true) { return 3; } else { return 2; }");
138    }
139
140    #[test]
141    fn do_statement() {
142        parse("while (true) { return 1; }");
143    }
144}
powr_parser/lib.rs

powr_parser/
lib.rs
