153 lines
4.7 KiB
C++
153 lines
4.7 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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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/GenericLexer.h>
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#include <AK/JsonObject.h>
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#include <AK/JsonValue.h>
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#include <LibGUI/GMLParser.h>
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#include <ctype.h>
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namespace GUI {
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static bool is_valid_class_name_character(char ch)
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{
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return isalpha(ch) || ch == ':';
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}
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static bool is_valid_property_name_character(char ch)
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{
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return isalpha(ch) || ch == '_';
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}
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static void swallow_whitespace(GenericLexer& scanner)
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{
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scanner.consume_while([](auto ch) { return isspace(ch); });
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}
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static Optional<JsonValue> parse_core_object(GenericLexer& scanner)
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{
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JsonObject object;
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JsonArray children;
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// '@Foo' means new Core::Object of class Foo
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if (!scanner.consume_specific('@')) {
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dbgln("Expected '@'");
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return {};
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}
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auto class_name = scanner.consume_while([](auto ch) { return is_valid_class_name_character(ch); });
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object.set("class", JsonValue(class_name));
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swallow_whitespace(scanner);
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if (!scanner.consume_specific('{')) {
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dbgln("Expected '{{'");
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return {};
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}
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swallow_whitespace(scanner);
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for (;;) {
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swallow_whitespace(scanner);
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if (scanner.peek() == '}') {
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// End of object
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break;
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}
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if (scanner.peek() == '@') {
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// It's a child object.
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auto value = parse_core_object(scanner);
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if (!value.has_value())
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return {};
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if (!value.value().is_object()) {
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dbgln("Expected child to be Core::Object");
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return {};
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}
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children.append(value.release_value());
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} else {
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// It's a property.
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auto property_name = scanner.consume_while([](auto ch) { return is_valid_property_name_character(ch); });
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swallow_whitespace(scanner);
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if (property_name.is_empty()) {
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dbgln("Expected non-empty property name");
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return {};
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}
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if (!scanner.consume_specific(':')) {
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dbgln("Expected ':'");
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return {};
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}
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swallow_whitespace(scanner);
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JsonValue value;
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if (scanner.peek() == '@') {
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auto parsed_value = parse_core_object(scanner);
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if (!parsed_value.has_value())
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return {};
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if (!parsed_value.value().is_object()) {
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dbgln("Expected property to be Core::Object");
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return {};
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}
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value = parsed_value.release_value();
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} else {
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auto value_string = scanner.consume_line();
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auto parsed_value = JsonValue::from_string(value_string);
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if (!parsed_value.has_value()) {
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dbgln("Expected property to be JSON value");
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return {};
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}
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value = parsed_value.release_value();
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}
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object.set(property_name, move(value));
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}
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}
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if (!scanner.consume_specific('}')) {
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dbgln("Expected '}'");
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return {};
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}
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if (!children.is_empty())
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object.set("children", move(children));
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return object;
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}
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JsonValue parse_gml(const StringView& string)
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{
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GenericLexer scanner(string);
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auto root = parse_core_object(scanner);
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if (!root.has_value())
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return JsonValue();
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return root.release_value();
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}
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}
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