tsrun 0.1.23

A TypeScript interpreter designed for embedding in applications
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250

//! RegExp built-in methods

use crate::error::JsError;
use crate::gc::Gc;
use crate::interpreter::Interpreter;
use crate::platform::CompiledRegex;
use crate::prelude::{Rc, String, ToString, Vec};
use crate::value::{ExoticObject, Guarded, JsObject, JsString, JsValue, PropertyKey};

/// Initialize RegExp.prototype with test and exec methods
pub fn init_regexp_prototype(interp: &mut Interpreter) {
    let proto = interp.regexp_prototype.clone();

    interp.register_method(&proto, "test", regexp_test, 1);
    interp.register_method(&proto, "exec", regexp_exec, 1);
}

/// Create RegExp constructor
pub fn create_regexp_constructor(interp: &mut Interpreter) -> Gc<JsObject> {
    let constructor = interp.create_native_function("RegExp", regexp_constructor, 2);

    // Set constructor.prototype = RegExp.prototype
    let proto_key = PropertyKey::String(interp.intern("prototype"));
    constructor
        .borrow_mut()
        .set_property(proto_key, JsValue::Object(interp.regexp_prototype.clone()));

    // Set RegExp.prototype.constructor = RegExp
    let constructor_key = PropertyKey::String(interp.intern("constructor"));
    interp
        .regexp_prototype
        .borrow_mut()
        .set_property(constructor_key, JsValue::Object(constructor.clone()));

    // Add Symbol.species getter
    interp.register_species_getter(&constructor);

    constructor
}

pub fn regexp_constructor(
    interp: &mut Interpreter,
    _this: JsValue,
    args: &[JsValue],
) -> Result<Guarded, JsError> {
    let empty = interp.intern("");
    let pattern_arg = args
        .first()
        .cloned()
        .unwrap_or(JsValue::String(empty.clone()));
    let pattern = interp.to_js_string(&pattern_arg).to_string();
    let flags_arg = args.get(1).cloned().unwrap_or(JsValue::String(empty));
    let flags = interp.to_js_string(&flags_arg).to_string();

    // Compile the regex to validate it (also caches for later use)
    let compiled = interp.compile_regexp(&pattern, &flags)?;

    // Pre-intern all property keys
    let source_key = PropertyKey::String(interp.intern("source"));
    let flags_key = PropertyKey::String(interp.intern("flags"));
    let global_key = PropertyKey::String(interp.intern("global"));
    let ignore_case_key = PropertyKey::String(interp.intern("ignoreCase"));
    let multiline_key = PropertyKey::String(interp.intern("multiline"));
    let dot_all_key = PropertyKey::String(interp.intern("dotAll"));
    let unicode_key = PropertyKey::String(interp.intern("unicode"));
    let sticky_key = PropertyKey::String(interp.intern("sticky"));
    let last_index_key = PropertyKey::String(interp.intern("lastIndex"));

    let guard = interp.heap.create_guard();
    let regexp_obj = interp.create_object(&guard);
    {
        let mut obj = regexp_obj.borrow_mut();
        obj.exotic = ExoticObject::RegExp {
            pattern: pattern.clone(),
            flags: flags.clone(),
            compiled: Some(compiled),
        };
        obj.prototype = Some(interp.regexp_prototype.clone());
        obj.set_property(source_key, JsValue::String(JsString::from(pattern)));
        obj.set_property(flags_key, JsValue::String(JsString::from(flags.clone())));
        obj.set_property(global_key, JsValue::Boolean(flags.contains('g')));
        obj.set_property(ignore_case_key, JsValue::Boolean(flags.contains('i')));
        obj.set_property(multiline_key, JsValue::Boolean(flags.contains('m')));
        obj.set_property(dot_all_key, JsValue::Boolean(flags.contains('s')));
        obj.set_property(unicode_key, JsValue::Boolean(flags.contains('u')));
        obj.set_property(sticky_key, JsValue::Boolean(flags.contains('y')));
        // Initialize lastIndex to 0
        obj.set_property(last_index_key, JsValue::Number(0.0));
    }
    Ok(Guarded::with_guard(JsValue::Object(regexp_obj), guard))
}

/// Get pattern and flags from a RegExp object
pub fn get_regexp_data(this: &JsValue) -> Result<(String, String), JsError> {
    let JsValue::Object(obj) = this else {
        return Err(JsError::type_error("this is not a RegExp"));
    };
    let obj_ref = obj.borrow();
    if let ExoticObject::RegExp {
        ref pattern,
        ref flags,
        ..
    } = obj_ref.exotic
    {
        Ok((pattern.clone(), flags.clone()))
    } else {
        Err(JsError::type_error("this is not a RegExp"))
    }
}

/// Get the compiled regex from a RegExp object, compiling if needed
pub fn get_compiled_regexp(
    interp: &Interpreter,
    obj: &Gc<JsObject>,
) -> Result<Rc<dyn CompiledRegex>, JsError> {
    let obj_ref = obj.borrow();
    if let ExoticObject::RegExp {
        ref pattern,
        ref flags,
        ref compiled,
        ..
    } = obj_ref.exotic
    {
        if let Some(compiled) = compiled {
            return Ok(compiled.clone());
        }
        // Not cached - compile now
        let pattern = pattern.clone();
        let flags = flags.clone();
        drop(obj_ref);
        interp.compile_regexp(&pattern, &flags)
    } else {
        Err(JsError::type_error("this is not a RegExp"))
    }
}

pub fn regexp_test(
    interp: &mut Interpreter,
    this: JsValue,
    args: &[JsValue],
) -> Result<Guarded, JsError> {
    let JsValue::Object(ref obj) = this else {
        return Err(JsError::type_error("this is not a RegExp"));
    };

    let re = get_compiled_regexp(interp, obj)?;

    // Use ToString abstract operation (calls object's toString if needed)
    let input_arg = args.first().cloned().unwrap_or(JsValue::Undefined);
    let input = interp.coerce_to_string(&input_arg)?.to_string();

    let is_match = re
        .is_match(&input)
        .map_err(|e| JsError::syntax_error(e, 0, 0))?;
    Ok(Guarded::unguarded(JsValue::Boolean(is_match)))
}

pub fn regexp_exec(
    interp: &mut Interpreter,
    this: JsValue,
    args: &[JsValue],
) -> Result<Guarded, JsError> {
    let JsValue::Object(ref obj) = this else {
        return Err(JsError::type_error("this is not a RegExp"));
    };

    let (_, flags) = get_regexp_data(&this)?;
    let re = get_compiled_regexp(interp, obj)?;

    // Use ToString abstract operation (calls object's toString if needed)
    let input_arg = args.first().cloned().unwrap_or(JsValue::Undefined);
    let input = interp.coerce_to_string(&input_arg)?.to_string();

    let is_global = flags.contains('g');
    let is_sticky = flags.contains('y');

    // Pre-intern property keys
    let last_index_key = PropertyKey::String(interp.intern("lastIndex"));
    let index_key = PropertyKey::String(interp.intern("index"));
    let input_key = PropertyKey::String(interp.intern("input"));

    // Get lastIndex for global/sticky regexes
    let last_index = if is_global || is_sticky {
        let li = obj
            .borrow()
            .get_property(&last_index_key)
            .unwrap_or(JsValue::Number(0.0));
        match li {
            JsValue::Number(n) => n as usize,
            _ => 0,
        }
    } else {
        0
    };

    // Check if lastIndex is past end of string
    if last_index > input.len() {
        if is_global || is_sticky {
            obj.borrow_mut()
                .set_property(last_index_key, JsValue::Number(0.0));
        }
        return Ok(Guarded::unguarded(JsValue::Null));
    }

    // Use the provider's find method which handles start position
    let match_result = re
        .find(&input, last_index)
        .map_err(|e| JsError::syntax_error(e, 0, 0))?;

    match match_result {
        Some(regex_match) => {
            // Build result array from captures
            let mut result = Vec::new();
            for capture in &regex_match.captures {
                match capture {
                    Some((start, end)) => {
                        let s = input.get(*start..*end).unwrap_or("");
                        result.push(JsValue::String(JsString::from(s)));
                    }
                    None => result.push(JsValue::Undefined),
                }
            }

            let guard = interp.heap.create_guard();
            let arr = interp.create_array_from(&guard, result);

            // Set index property (match start position)
            arr.borrow_mut()
                .set_property(index_key, JsValue::Number(regex_match.start as f64));
            arr.borrow_mut()
                .set_property(input_key, JsValue::String(JsString::from(input.clone())));

            // Update lastIndex for global/sticky regexes
            if is_global || is_sticky {
                obj.borrow_mut()
                    .set_property(last_index_key, JsValue::Number(regex_match.end as f64));
            }

            Ok(Guarded::with_guard(JsValue::Object(arr), guard))
        }
        None => {
            // Reset lastIndex to 0 on no match for global/sticky
            if is_global || is_sticky {
                obj.borrow_mut()
                    .set_property(last_index_key, JsValue::Number(0.0));
            }
            Ok(Guarded::unguarded(JsValue::Null))
        }
    }
}