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/*
* Copyright (c) 2020, Matthew Olsson <mattco@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Function.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/Runtime/PrimitiveString.h>
#include <LibJS/Runtime/RegExpObject.h>
#include <LibJS/Runtime/StringPrototype.h>
#include <LibJS/Runtime/Value.h>
#include <LibJS/Token.h>
namespace JS {
Result<regex::RegexOptions<ECMAScriptFlags>, String> regex_flags_from_string(StringView flags)
{
bool d = false, g = false, i = false, m = false, s = false, u = false, y = false;
auto options = RegExpObject::default_flags;
for (auto ch : flags) {
switch (ch) {
case 'd':
if (d)
return String::formatted(ErrorType::RegExpObjectRepeatedFlag.message(), ch);
d = true;
break;
case 'g':
if (g)
return String::formatted(ErrorType::RegExpObjectRepeatedFlag.message(), ch);
g = true;
options |= regex::ECMAScriptFlags::Global;
break;
case 'i':
if (i)
return String::formatted(ErrorType::RegExpObjectRepeatedFlag.message(), ch);
i = true;
options |= regex::ECMAScriptFlags::Insensitive;
break;
case 'm':
if (m)
return String::formatted(ErrorType::RegExpObjectRepeatedFlag.message(), ch);
m = true;
options |= regex::ECMAScriptFlags::Multiline;
break;
case 's':
if (s)
return String::formatted(ErrorType::RegExpObjectRepeatedFlag.message(), ch);
s = true;
options |= regex::ECMAScriptFlags::SingleLine;
break;
case 'u':
if (u)
return String::formatted(ErrorType::RegExpObjectRepeatedFlag.message(), ch);
u = true;
options |= regex::ECMAScriptFlags::Unicode;
break;
case 'y':
if (y)
return String::formatted(ErrorType::RegExpObjectRepeatedFlag.message(), ch);
y = true;
// Now for the more interesting flag, 'sticky' actually unsets 'global', part of which is the default.
options.reset_flag(regex::ECMAScriptFlags::Global);
// "What's the difference between sticky and global, then", that's simple.
// all the other flags imply 'global', and the "global" flag implies 'stateful';
// however, the "sticky" flag does *not* imply 'global', only 'stateful'.
options |= (regex::ECMAScriptFlags)regex::AllFlags::Internal_Stateful;
options |= regex::ECMAScriptFlags::Sticky;
break;
default:
return String::formatted(ErrorType::RegExpObjectBadFlag.message(), ch);
}
}
return options;
}
String parse_regex_pattern(StringView pattern, bool unicode)
{
auto utf16_pattern = AK::utf8_to_utf16(pattern);
Utf16View utf16_pattern_view { utf16_pattern };
StringBuilder builder;
// If the Unicode flag is set, append each code point to the pattern. Otherwise, append each
// code unit. But unlike the spec, multi-byte code units must be escaped for LibRegex to parse.
for (size_t i = 0; i < utf16_pattern_view.length_in_code_units();) {
if (unicode) {
auto code_point = code_point_at(utf16_pattern_view, i);
builder.append_code_point(code_point.code_point);
i += code_point.code_unit_count;
continue;
}
u16 code_unit = utf16_pattern_view.code_unit_at(i);
++i;
if (code_unit > 0x7f)
builder.appendff("\\u{:04x}", code_unit);
else
builder.append_code_point(code_unit);
}
return builder.build();
}
RegExpObject* RegExpObject::create(GlobalObject& global_object)
{
return global_object.heap().allocate<RegExpObject>(global_object, *global_object.regexp_prototype());
}
RegExpObject* RegExpObject::create(GlobalObject& global_object, Regex<ECMA262> regex, String pattern, String flags)
{
return global_object.heap().allocate<RegExpObject>(global_object, move(regex), move(pattern), move(flags), *global_object.regexp_prototype());
}
RegExpObject::RegExpObject(Object& prototype)
: Object(prototype)
{
}
RegExpObject::RegExpObject(Regex<ECMA262> regex, String pattern, String flags, Object& prototype)
: Object(prototype)
, m_pattern(move(pattern))
, m_flags(move(flags))
, m_regex(move(regex))
{
VERIFY(m_regex->parser_result.error == regex::Error::NoError);
}
RegExpObject::~RegExpObject()
{
}
void RegExpObject::initialize(GlobalObject& global_object)
{
auto& vm = this->vm();
Object::initialize(global_object);
define_direct_property(vm.names.lastIndex, Value(0), Attribute::Writable);
}
// 22.2.3.2.2 RegExpInitialize ( obj, pattern, flags ), https://tc39.es/ecma262/#sec-regexpinitialize
ThrowCompletionOr<RegExpObject*> RegExpObject::regexp_initialize(GlobalObject& global_object, Value pattern, Value flags)
{
auto& vm = global_object.vm();
String f;
if (flags.is_undefined()) {
f = String::empty();
} else {
f = TRY(flags.to_string(global_object));
}
String original_pattern;
String parsed_pattern;
if (pattern.is_undefined()) {
original_pattern = String::empty();
parsed_pattern = String::empty();
} else {
original_pattern = TRY(pattern.to_string(global_object));
bool unicode = f.find('u').has_value();
parsed_pattern = parse_regex_pattern(original_pattern, unicode);
}
auto parsed_flags_or_error = regex_flags_from_string(f);
if (parsed_flags_or_error.is_error())
return vm.throw_completion<SyntaxError>(global_object, parsed_flags_or_error.release_error());
Regex<ECMA262> regex(move(parsed_pattern), parsed_flags_or_error.release_value());
if (regex.parser_result.error != regex::Error::NoError)
return vm.throw_completion<SyntaxError>(global_object, ErrorType::RegExpCompileError, regex.error_string());
m_pattern = move(original_pattern);
m_flags = move(f);
m_regex = move(regex);
TRY(set(vm.names.lastIndex, Value(0), Object::ShouldThrowExceptions::Yes));
return this;
}
// 22.2.3.2.5 EscapeRegExpPattern ( P, F ), https://tc39.es/ecma262/#sec-escaperegexppattern
String RegExpObject::escape_regexp_pattern() const
{
if (m_pattern.is_empty())
return "(?:)";
// FIXME: Check u flag and escape accordingly
return m_pattern.replace("\n", "\\n", true).replace("\r", "\\r", true).replace(LINE_SEPARATOR_STRING, "\\u2028", true).replace(PARAGRAPH_SEPARATOR_STRING, "\\u2029", true).replace("/", "\\/", true);
}
// 22.2.3.2.4 RegExpCreate ( P, F ), https://tc39.es/ecma262/#sec-regexpcreate
ThrowCompletionOr<RegExpObject*> regexp_create(GlobalObject& global_object, Value pattern, Value flags)
{
auto* regexp_object = RegExpObject::create(global_object);
return TRY(regexp_object->regexp_initialize(global_object, pattern, flags));
}
}
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