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ladybird/Userland/Libraries/LibJS/Runtime/RegExpConstructor.cpp

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LibJS: Lex and parse regex literals, add RegExp objects This adds regex parsing/lexing, as well as a relatively empty RegExpObject. The purpose of this patch is to allow the engine to not get hung up on parsing regexes. This will aid in finding new syntax errors (say, from google or twitter) without having to replace all of their regexes first!
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/*
Userland: Use mattco@serenityos.org for my copyright headers
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* Copyright (c) 2020, Matthew Olsson <mattco@serenityos.org>
LibJS: Lex and parse regex literals, add RegExp objects This adds regex parsing/lexing, as well as a relatively empty RegExpObject. The purpose of this patch is to allow the engine to not get hung up on parsing regexes. This will aid in finding new syntax errors (say, from google or twitter) without having to replace all of their regexes first!
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*
Everything: Move to SPDX license identifiers in all files. SPDX License Identifiers are a more compact / standardized way of representing file license information. See: https://spdx.dev/resources/use/#identifiers This was done with the `ambr` search and replace tool. ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *
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* SPDX-License-Identifier: BSD-2-Clause
LibJS: Lex and parse regex literals, add RegExp objects This adds regex parsing/lexing, as well as a relatively empty RegExpObject. The purpose of this patch is to allow the engine to not get hung up on parsing regexes. This will aid in finding new syntax errors (say, from google or twitter) without having to replace all of their regexes first!
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*/
#include <LibJS/Runtime/Error.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/Runtime/RegExpConstructor.h>
#include <LibJS/Runtime/RegExpObject.h>
namespace JS {
LibJS: Move native objects towards two-pass construction To make sure that everything is set up correctly in objects before we start adding properties to them, we split cell allocation into 3 steps: 1. Allocate a cell of appropriate size from the Heap 2. Call the C++ constructor on the cell 3. Call initialize() on the constructed object The job of initialize() is to define all the initial properties. Doing it in a second pass guarantees that the Object has a valid Shape and can find its own GlobalObject.
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RegExpConstructor::RegExpConstructor(GlobalObject& global_object)
LibJS: Accept FlyStrings in the NativeFunction constructors This makes the implicit run-time assertion in PropertyName::to_string() into an explicit compile-time requirement, removes a wasteful FlyString -> PropertyName -> FlyString construction from NativeFunction::create() and allows setting the function name to a null string for anonymous native functions.
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: NativeFunction(vm().names.RegExp.as_string(), *global_object.function_prototype())
LibJS: Lex and parse regex literals, add RegExp objects This adds regex parsing/lexing, as well as a relatively empty RegExpObject. The purpose of this patch is to allow the engine to not get hung up on parsing regexes. This will aid in finding new syntax errors (say, from google or twitter) without having to replace all of their regexes first!
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{
LibJS: Move native objects towards two-pass construction To make sure that everything is set up correctly in objects before we start adding properties to them, we split cell allocation into 3 steps: 1. Allocate a cell of appropriate size from the Heap 2. Call the C++ constructor on the cell 3. Call initialize() on the constructed object The job of initialize() is to define all the initial properties. Doing it in a second pass guarantees that the Object has a valid Shape and can find its own GlobalObject.
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}
LibJS: Simplify Cell::initialize() Remove the Interpreter& argument and pass only GlobalObject&. We can find everything we need via the global object anyway.
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void RegExpConstructor::initialize(GlobalObject& global_object)
LibJS: Move native objects towards two-pass construction To make sure that everything is set up correctly in objects before we start adding properties to them, we split cell allocation into 3 steps: 1. Allocate a cell of appropriate size from the Heap 2. Call the C++ constructor on the cell 3. Call initialize() on the constructed object The job of initialize() is to define all the initial properties. Doing it in a second pass guarantees that the Object has a valid Shape and can find its own GlobalObject.
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{
LibJS: Cache commonly used FlyStrings in the VM Roughly 7% of test-js runtime was spent creating FlyStrings from string literals. This patch frontloads that work and caches all the commonly used names in LibJS on a CommonPropertyNames struct that hangs off VM.
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auto& vm = this->vm();
LibJS: Simplify Cell::initialize() Remove the Interpreter& argument and pass only GlobalObject&. We can find everything we need via the global object anyway.
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NativeFunction::initialize(global_object);
LibJS: Add a bunch more missing ECMA-262 section/title/URL comments
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// 22.2.4.1 RegExp.prototype, https://tc39.es/ecma262/#sec-regexp.prototype
LibJS: Add define_direct_property and remove the define_property helper This removes all usages of the non-standard define_property helper method and replaces all it's usages with the specification required alternative or with define_direct_property where appropriate.
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define_direct_property(vm.names.prototype, global_object.regexp_prototype(), 0);
LibJS: Add a bunch more missing ECMA-262 section/title/URL comments
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LibJS: Change PropertyName(Symbol*) => PropertyName(Symbol&) Requires a bunch of find-and-replace updates across LibJS, but constructing a PropertyName from a nullptr Symbol* should not be possible - let's enforce this at the compiler level instead of using VERIFY() (and already dereference Symbol pointers at the call site).
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define_native_accessor(*vm.well_known_symbol_species(), symbol_species_getter, {}, Attribute::Configurable);
LibJS: Reorder and add missing name & length properties to Built-ins The specification dicatates that each built-in will have a length and name property. (defined in that order)
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define_direct_property(vm.names.length, Value(2), Attribute::Configurable);
LibJS: Lex and parse regex literals, add RegExp objects This adds regex parsing/lexing, as well as a relatively empty RegExpObject. The purpose of this patch is to allow the engine to not get hung up on parsing regexes. This will aid in finding new syntax errors (say, from google or twitter) without having to replace all of their regexes first!
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}
RegExpConstructor::~RegExpConstructor()
{
}
LibJS: Add a bunch more missing ECMA-262 section/title/URL comments
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// 22.2.3.1 RegExp ( pattern, flags ), https://tc39.es/ecma262/#sec-regexp-pattern-flags
LibJS: Make Function::call() not require an Interpreter& This makes a difference inside ScriptFunction::call(), which will now instantiate a temporary Interpreter if one is not attached to the VM.
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Value RegExpConstructor::call()
LibJS: Lex and parse regex literals, add RegExp objects This adds regex parsing/lexing, as well as a relatively empty RegExpObject. The purpose of this patch is to allow the engine to not get hung up on parsing regexes. This will aid in finding new syntax errors (say, from google or twitter) without having to replace all of their regexes first!
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{
LibJS: Remove Interpreter& argument to Function::construct() This is no longer needed, we can get everything we need from the VM.
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return construct(*this);
LibJS: Lex and parse regex literals, add RegExp objects This adds regex parsing/lexing, as well as a relatively empty RegExpObject. The purpose of this patch is to allow the engine to not get hung up on parsing regexes. This will aid in finding new syntax errors (say, from google or twitter) without having to replace all of their regexes first!
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}
LibJS: Add a bunch more missing ECMA-262 section/title/URL comments
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// 22.2.3.1 RegExp ( pattern, flags ), https://tc39.es/ecma262/#sec-regexp-pattern-flags
LibJS: Rename Function => FunctionObject
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Value RegExpConstructor::construct(FunctionObject&)
LibJS: Lex and parse regex literals, add RegExp objects This adds regex parsing/lexing, as well as a relatively empty RegExpObject. The purpose of this patch is to allow the engine to not get hung up on parsing regexes. This will aid in finding new syntax errors (say, from google or twitter) without having to replace all of their regexes first!
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{
LibJS: Make native function/property callbacks take VM, not Interpreter More work on decoupling the general runtime from Interpreter. The goal is becoming clearer. Interpreter should be one possible way to execute code inside a VM. In the future we might have other ways :^)
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auto& vm = this->vm();
LibJS: Stop using a native property for RegExp's lastIndex property This is not a functional change, the exposed (incorrect) behaviour is the same as it was before, this simply removes the last user of NativeProperties, allowing us to remove them completely from LibJS.
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// FIXME: This is non-conforming
return regexp_create(global_object(), vm.argument(0), vm.argument(1));
LibJS: Lex and parse regex literals, add RegExp objects This adds regex parsing/lexing, as well as a relatively empty RegExpObject. The purpose of this patch is to allow the engine to not get hung up on parsing regexes. This will aid in finding new syntax errors (say, from google or twitter) without having to replace all of their regexes first!
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}
LibJS: Add a bunch more missing ECMA-262 section/title/URL comments
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// 22.2.4.2 get RegExp [ @@species ], https://tc39.es/ecma262/#sec-get-regexp-@@species
LibJS: Add the Symbol.species getter to the appropriate built-ins
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JS_DEFINE_NATIVE_GETTER(RegExpConstructor::symbol_species_getter)
{
return vm.this_value(global_object);
}
LibJS: Lex and parse regex literals, add RegExp objects This adds regex parsing/lexing, as well as a relatively empty RegExpObject. The purpose of this patch is to allow the engine to not get hung up on parsing regexes. This will aid in finding new syntax errors (say, from google or twitter) without having to replace all of their regexes first!
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}
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