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LibJS: Add spec comments to RegExp.prototype.[flags, source, exec, test]

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Timothy Flynn 2021-12-17 15:22:22 -05:00 • committed by Linus Groh
parent 4a915fc9fa
commit 179ca9d058
1 changed files with 53 additions and 1 deletions
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54
Userland/Libraries/LibJS/Runtime/RegExpPrototype.cpp
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@ -283,14 +283,20 @@ ThrowCompletionOr<Value> regexp_exec(GlobalObject& global_object, Object& regexp
#define __JS_ENUMERATE(flagName, flag_name, flag_char) \
JS_DEFINE_NATIVE_FUNCTION(RegExpPrototype::flag_name) \
{ \
/* 1. If Type(R) is not Object, throw a TypeError exception. */ \
auto* regexp_object = TRY(this_object(global_object)); \
/* 2. If R does not have an [[OriginalFlags]] internal slot, then */ \
if (!is<RegExpObject>(regexp_object)) { \
/* a. If SameValue(R, %RegExp.prototype%) is true, return undefined. */ \
if (same_value(regexp_object, global_object.regexp_prototype())) \
return js_undefined(); \
/* b. Otherwise, throw a TypeError exception. */ \
return vm.throw_completion<TypeError>(global_object, ErrorType::NotAnObjectOfType, "RegExp"); \
} \
\
/* 3. Let flags be R.[[OriginalFlags]]. */ \
auto const& flags = static_cast<RegExpObject*>(regexp_object)->flags(); \
/* 4. If flags contains codeUnit, return true. */ \
/* 5. Return false. */ \
return Value(flags.contains(#flag_char##sv)); \
}
JS_ENUMERATE_REGEXP_FLAGS
@ -299,9 +305,26 @@ JS_ENUMERATE_REGEXP_FLAGS
// 22.2.5.4 get RegExp.prototype.flags, https://tc39.es/ecma262/#sec-get-regexp.prototype.flags
JS_DEFINE_NATIVE_FUNCTION(RegExpPrototype::flags)
{
// 1. Let R be the this value.
// 2. If Type(R) is not Object, throw a TypeError exception.
auto* regexp_object = TRY(this_object(global_object));
// 3. Let result be the empty String.
StringBuilder builder(8);
// 4. Let global be ! ToBoolean(? Get(R, "global")).
// 5. If global is true, append the code unit 0x0067 (LATIN SMALL LETTER G) as the last code unit of result.
// 6. Let ignoreCase be ! ToBoolean(? Get(R, "ignoreCase")).
// 7. If ignoreCase is true, append the code unit 0x0069 (LATIN SMALL LETTER I) as the last code unit of result.
// 8. Let multiline be ! ToBoolean(? Get(R, "multiline")).
// 9. If multiline is true, append the code unit 0x006D (LATIN SMALL LETTER M) as the last code unit of result.
// 10. Let dotAll be ! ToBoolean(? Get(R, "dotAll")).
// 11. If dotAll is true, append the code unit 0x0073 (LATIN SMALL LETTER S) as the last code unit of result.
// 12. Let unicode be ! ToBoolean(? Get(R, "unicode")).
// 13. If unicode is true, append the code unit 0x0075 (LATIN SMALL LETTER U) as the last code unit of result.
// 14. Let sticky be ! ToBoolean(? Get(R, "sticky")).
// 15. If sticky is true, append the code unit 0x0079 (LATIN SMALL LETTER Y) as the last code unit of result.
#define __JS_ENUMERATE(flagName, flag_name, flag_char) \
auto flag_##flag_name = TRY(regexp_object->get(vm.names.flagName)); \
if (flag_##flag_name.to_boolean()) \
@ -309,53 +332,82 @@ JS_DEFINE_NATIVE_FUNCTION(RegExpPrototype::flags)
JS_ENUMERATE_REGEXP_FLAGS
#undef __JS_ENUMERATE
// 16. Return result.
return js_string(vm, builder.to_string());
}
// 22.2.5.12 get RegExp.prototype.source, https://tc39.es/ecma262/#sec-get-regexp.prototype.source
JS_DEFINE_NATIVE_FUNCTION(RegExpPrototype::source)
{
// 1. Let R be the this value.
// 2. If Type(R) is not Object, throw a TypeError exception.
auto* regexp_object = TRY(this_object(global_object));
// 3. If R does not have an [[OriginalSource]] internal slot, then
if (!is<RegExpObject>(regexp_object)) {
// a. If SameValue(R, %RegExp.prototype%) is true, return "(?:)".
if (same_value(regexp_object, global_object.regexp_prototype()))
return js_string(vm, "(?:)");
// b. Otherwise, throw a TypeError exception.
return vm.throw_completion<TypeError>(global_object, ErrorType::NotAnObjectOfType, "RegExp");
}
// 4. Assert: R has an [[OriginalFlags]] internal slot.
// 5. Let src be R.[[OriginalSource]].
// 6. Let flags be R.[[OriginalFlags]].
// 7. Return EscapeRegExpPattern(src, flags).
return js_string(vm, static_cast<RegExpObject&>(*regexp_object).escape_regexp_pattern());
}
// 22.2.5.2 RegExp.prototype.exec ( string ), https://tc39.es/ecma262/#sec-regexp.prototype.exec
JS_DEFINE_NATIVE_FUNCTION(RegExpPrototype::exec)
{
// 1. Let R be the this value.
// 2. Perform ? RequireInternalSlot(R, [[RegExpMatcher]]).
auto* regexp_object = TRY(typed_this_object(global_object));
// 3. Let S be ? ToString(string).
auto string = TRY(vm.argument(0).to_utf16_string(global_object));
// 4. Return ? RegExpBuiltinExec(R, S).
return TRY(regexp_builtin_exec(global_object, *regexp_object, move(string)));
}
// 22.2.5.15 RegExp.prototype.test ( S ), https://tc39.es/ecma262/#sec-regexp.prototype.test
JS_DEFINE_NATIVE_FUNCTION(RegExpPrototype::test)
{
// 1. Let R be the this value.
// 2. If Type(R) is not Object, throw a TypeError exception.
auto* regexp_object = TRY(this_object(global_object));
// 3. Let string be ? ToString(S).
auto string = TRY(vm.argument(0).to_utf16_string(global_object));
// 4. Let match be ? RegExpExec(R, string).
auto match = TRY(regexp_exec(global_object, *regexp_object, move(string)));
// 5. If match is not null, return true; else return false.
return Value(!match.is_null());
}
// 22.2.5.16 RegExp.prototype.toString ( ), https://tc39.es/ecma262/#sec-regexp.prototype.tostring
JS_DEFINE_NATIVE_FUNCTION(RegExpPrototype::to_string)
{
// 1. Let R be the this value.
// 2. If Type(R) is not Object, throw a TypeError exception.
auto* regexp_object = TRY(this_object(global_object));
// 3. Let pattern be ? ToString(? Get(R, "source")).
auto source_attr = TRY(regexp_object->get(vm.names.source));
auto pattern = TRY(source_attr.to_string(global_object));
// 4. Let flags be ? ToString(? Get(R, "flags")).
auto flags_attr = TRY(regexp_object->get(vm.names.flags));
auto flags = TRY(flags_attr.to_string(global_object));
// 5. Let result be the string-concatenation of "/", pattern, "/", and flags.
// 6. Return result.
return js_string(vm, String::formatted("/{}/{}", pattern, flags));
}