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ES 5(.1) described parsing of the function body string as: https://www.ecma-international.org/ecma-262/5.1/#sec-15.3.2.1 7. If P is not parsable as a FormalParameterList[opt] then throw a SyntaxError exception. 8. If body is not parsable as FunctionBody then throw a SyntaxError exception. We implemented it as building the source string of a complete function and feeding that to the parser, with the same outcome. ES 2015+ does exactly that, but with newlines at certain positions: https://tc39.es/ecma262/#sec-createdynamicfunction 16. Let bodyString be the string-concatenation of 0x000A (LINE FEED), ? ToString(bodyArg), and 0x000A (LINE FEED). 17. Let prefix be the prefix associated with kind in Table 49. 18. Let sourceString be the string-concatenation of prefix, " anonymous(", P, 0x000A (LINE FEED), ") {", bodyString, and "}". This patch updates the generated source string to match these requirements. This will make certain edge cases work, e.g. 'new Function("-->")', where the user supplied input must be placed on its own line to be valid syntax.
105 lines
3.8 KiB
C++
105 lines
3.8 KiB
C++
/*
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* Copyright (c) 2020, Linus Groh <mail@linusgroh.de>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/StringBuilder.h>
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#include <LibJS/AST.h>
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#include <LibJS/Interpreter.h>
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#include <LibJS/Parser.h>
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#include <LibJS/Runtime/Error.h>
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#include <LibJS/Runtime/FunctionConstructor.h>
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#include <LibJS/Runtime/GlobalObject.h>
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#include <LibJS/Runtime/ScriptFunction.h>
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namespace JS {
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FunctionConstructor::FunctionConstructor(GlobalObject& global_object)
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: NativeFunction(vm().names.Function, *global_object.function_prototype())
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{
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}
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void FunctionConstructor::initialize(GlobalObject& global_object)
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{
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auto& vm = this->vm();
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NativeFunction::initialize(global_object);
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define_property(vm.names.prototype, global_object.function_prototype(), 0);
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define_property(vm.names.length, Value(1), Attribute::Configurable);
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}
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FunctionConstructor::~FunctionConstructor()
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{
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}
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Value FunctionConstructor::call()
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{
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return construct(*this);
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}
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Value FunctionConstructor::construct(Function&)
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{
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auto& vm = this->vm();
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String parameters_source = "";
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String body_source = "";
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if (vm.argument_count() == 1) {
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body_source = vm.argument(0).to_string(global_object());
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if (vm.exception())
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return {};
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}
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if (vm.argument_count() > 1) {
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Vector<String> parameters;
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for (size_t i = 0; i < vm.argument_count() - 1; ++i) {
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parameters.append(vm.argument(i).to_string(global_object()));
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if (vm.exception())
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return {};
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}
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StringBuilder parameters_builder;
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parameters_builder.join(',', parameters);
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parameters_source = parameters_builder.build();
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body_source = vm.argument(vm.argument_count() - 1).to_string(global_object());
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if (vm.exception())
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return {};
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}
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auto source = String::formatted("function anonymous({}\n) {{\n{}\n}}", parameters_source, body_source);
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auto parser = Parser(Lexer(source));
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auto function_expression = parser.parse_function_node<FunctionExpression>();
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if (parser.has_errors()) {
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auto error = parser.errors()[0];
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vm.throw_exception<SyntaxError>(global_object(), error.to_string());
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return {};
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}
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OwnPtr<Interpreter> local_interpreter;
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Interpreter* interpreter = vm.interpreter_if_exists();
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if (!interpreter) {
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local_interpreter = Interpreter::create_with_existing_global_object(global_object());
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interpreter = local_interpreter.ptr();
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}
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VM::InterpreterExecutionScope scope(*interpreter);
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return function_expression->execute(*interpreter, global_object());
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}
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}
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