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https://github.com/RGBCube/serenity
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822dc56ef3
This patch replaces the UI-from-JSON mechanism with a more
human-friendly DSL.
The current implementation simply converts the GML into a JSON object
that can be consumed by GUI::Widget::load_from_json(). The parser is
not very helpful if you make a mistake.
The language offers a very simple way to instantiate any registered
Core::Object class by simply saying @ClassName
@GUI::Label {
text: "Hello friends!"
tooltip: ":^)"
}
Layouts are Core::Objects and can be assigned to the "layout" property:
@GUI::Widget {
layout: @GUI::VerticalBoxLayout {
spacing: 2
margins: [8, 8, 8, 8]
}
}
And finally, child objects are simply nested within their parent:
@GUI::Widget {
layout: @GUI::HorizontalBoxLayout {
}
@GUI::Button {
text: "OK"
}
@GUI::Button {
text: "Cancel"
}
}
This feels a *lot* more pleasant to write than the JSON we had. The fact
that no new code was being written with the JSON mechanism was pretty
telling, so let's approach this with developer convenience in mind. :^)
126 lines
3.8 KiB
C++
126 lines
3.8 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 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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ASSERT_NOT_REACHED();
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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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ASSERT_NOT_REACHED();
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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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ASSERT(value.is_object());
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children.append(move(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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ASSERT(!property_name.is_empty());
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if (!scanner.consume_specific(':'))
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ASSERT_NOT_REACHED();
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swallow_whitespace(scanner);
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JsonValue value;
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if (scanner.peek() == '@') {
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value = parse_core_object(scanner);
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ASSERT(value.is_object());
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} else {
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auto value_string = scanner.consume_line();
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value = JsonValue::from_string(value_string).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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ASSERT_NOT_REACHED();
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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.is_null())
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return JsonValue();
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return root;
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}
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}
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