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!

Libraries/LibJS/Runtime/GlobalObject.cpp

@@ -26,8 +26,6 @@
  */
 
 #include <AK/LogStream.h>
-#include <AK/String.h>
-#include <LibJS/Heap/Heap.h>
 #include <LibJS/Interpreter.h>
 #include <LibJS/Runtime/ArrayConstructor.h>
 #include <LibJS/Runtime/ArrayPrototype.h>
@@ -36,13 +34,11 @@
 #include <LibJS/Runtime/ConsoleObject.h>
 #include <LibJS/Runtime/DateConstructor.h>
 #include <LibJS/Runtime/DatePrototype.h>
-#include <LibJS/Runtime/Error.h>
 #include <LibJS/Runtime/ErrorConstructor.h>
 #include <LibJS/Runtime/ErrorPrototype.h>
 #include <LibJS/Runtime/FunctionConstructor.h>
 #include <LibJS/Runtime/FunctionPrototype.h>
 #include <LibJS/Runtime/GlobalObject.h>
-#include <LibJS/Runtime/LexicalEnvironment.h>
 #include <LibJS/Runtime/MathObject.h>
 #include <LibJS/Runtime/NativeFunction.h>
 #include <LibJS/Runtime/NumberConstructor.h>
@@ -53,6 +49,8 @@
 #include <LibJS/Runtime/ProxyConstructor.h>
 #include <LibJS/Runtime/ProxyPrototype.h>
 #include <LibJS/Runtime/ReflectObject.h>
+#include <LibJS/Runtime/RegExpConstructor.h>
+#include <LibJS/Runtime/RegExpPrototype.h>
 #include <LibJS/Runtime/Shape.h>
 #include <LibJS/Runtime/StringConstructor.h>
 #include <LibJS/Runtime/StringPrototype.h>
@@ -106,6 +104,7 @@ void GlobalObject::initialize()
     add_constructor("Number", m_number_constructor, *m_number_prototype);
     add_constructor("Object", m_object_constructor, *m_object_prototype);
     add_constructor("Proxy", m_proxy_constructor, *m_proxy_prototype);
+    add_constructor("RegExp", m_regexp_constructor, *m_regexp_prototype);
     add_constructor("String", m_string_constructor, *m_string_prototype);
     add_constructor("Symbol", m_symbol_constructor, *m_symbol_prototype);
 

Libraries/LibJS/Runtime/Object.h

@@ -102,6 +102,7 @@ public:
     virtual bool is_bound_function() const { return false; }
     virtual bool is_native_property() const { return false; }
     virtual bool is_proxy_object() const { return false; }
+    virtual bool is_regexp_object() const { return false; }
     virtual bool is_string_object() const { return false; }
     virtual bool is_symbol_object() const { return false; }
 

Libraries/LibJS/Runtime/RegExpConstructor.cpp

@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2020, Matthew Olsson <matthewcolsson@gmail.com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <LibJS/Interpreter.h>
+#include <LibJS/Runtime/Error.h>
+#include <LibJS/Runtime/GlobalObject.h>
+#include <LibJS/Runtime/RegExpConstructor.h>
+#include <LibJS/Runtime/RegExpObject.h>
+
+namespace JS {
+
+RegExpConstructor::RegExpConstructor()
+    : NativeFunction("RegExp", *interpreter().global_object().function_prototype())
+{
+    define_property("prototype", interpreter().global_object().regexp_prototype(), 0);
+    define_property("length", Value(2), Attribute::Configurable);
+}
+
+RegExpConstructor::~RegExpConstructor()
+{
+}
+
+Value RegExpConstructor::call(Interpreter& interpreter)
+{
+    return construct(interpreter);
+}
+
+Value RegExpConstructor::construct(Interpreter& interpreter)
+{
+    if (!interpreter.argument_count())
+        return RegExpObject::create(interpreter.global_object(), "(?:)", "");
+    auto contents = interpreter.argument(0).to_string(interpreter);
+    if (interpreter.exception())
+        return {};
+    auto flags = interpreter.argument_count() > 1 ? interpreter.argument(1).to_string(interpreter) : "";
+    if (interpreter.exception())
+        return {};
+    return RegExpObject::create(interpreter.global_object(), contents, flags);
+}
+
+}

Libraries/LibJS/Runtime/RegExpConstructor.h

@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2020, Matthew Olsson <matthewcolsson@gmail.com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <LibJS/Runtime/NativeFunction.h>
+
+namespace JS {
+
+class RegExpConstructor final : public NativeFunction {
+public:
+    RegExpConstructor();
+    virtual ~RegExpConstructor() override;
+
+    virtual Value call(Interpreter&) override;
+    virtual Value construct(Interpreter&) override;
+
+private:
+    virtual bool has_constructor() const override { return true; }
+    virtual const char* class_name() const override { return "RegExpConstructor"; }
+};
+
+}

Libraries/LibJS/Runtime/RegExpObject.cpp

@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) 2020, Matthew Olsson <matthewcolsson@gmail.com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <AK/StringBuilder.h>
+#include <LibJS/Heap/Heap.h>
+#include <LibJS/Interpreter.h>
+#include <LibJS/Runtime/GlobalObject.h>
+#include <LibJS/Runtime/PrimitiveString.h>
+#include <LibJS/Runtime/RegExpObject.h>
+#include <LibJS/Runtime/Value.h>
+
+
+namespace JS {
+
+RegExpObject* RegExpObject::create(GlobalObject& global_object, String content, String flags)
+{
+    return global_object.heap().allocate<RegExpObject>(content, flags, *global_object.regexp_prototype());
+}
+
+RegExpObject::RegExpObject(String content, String flags, Object& prototype)
+    : Object(&prototype)
+    , m_content(content)
+    , m_flags(flags)
+{
+}
+
+RegExpObject::~RegExpObject()
+{
+}
+
+Value RegExpObject::to_string() const
+{
+    return js_string(interpreter(), String::format("/%s/%s", content().characters(), flags().characters()));
+}
+
+}

Libraries/LibJS/Runtime/RegExpObject.h

@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 2020, Matthew Olsson <matthewcolsson@gmail.com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <LibJS/AST.h>
+#include <LibJS/Runtime/Object.h>
+
+namespace JS {
+
+class RegExpObject : public Object {
+public:
+    static RegExpObject* create(GlobalObject&, String content, String flags);
+
+    RegExpObject(String content, String flags, Object& prototype);
+    virtual ~RegExpObject() override;
+
+    const String& content() const { return m_content; }
+    const String& flags() const { return m_flags; }
+
+    Value to_string() const override;
+
+private:
+    virtual const char* class_name() const override { return "RegExpObject"; }
+    virtual bool is_regexp_object() const override { return true; }
+
+    String m_content;
+    String m_flags;
+};
+
+}

Libraries/LibJS/Runtime/RegExpPrototype.cpp

@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2020, Matthew Olsson <matthewcolsson@gmail.com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <AK/Function.h>
+#include <AK/StringBuilder.h>
+#include <LibJS/Heap/Heap.h>
+#include <LibJS/Interpreter.h>
+#include <LibJS/Runtime/GlobalObject.h>
+#include <LibJS/Runtime/PrimitiveString.h>
+#include <LibJS/Runtime/RegExpObject.h>
+#include <LibJS/Runtime/RegExpPrototype.h>
+
+namespace JS {
+
+RegExpPrototype::RegExpPrototype()
+    : RegExpObject({}, {}, *interpreter().global_object().object_prototype())
+{
+}
+
+RegExpPrototype::~RegExpPrototype()
+{
+}
+
+}

Libraries/LibJS/Runtime/RegExpPrototype.h

@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2020, Matthew Olsson <matthewcolsson@gmail.com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <LibJS/Runtime/RegExpObject.h>
+
+namespace JS {
+
+class RegExpPrototype final : public RegExpObject {
+public:
+    RegExpPrototype();
+    virtual ~RegExpPrototype() override;
+
+private:
+    virtual const char* class_name() const override { return "RegExpPrototype"; }
+};
+
+}