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#include <LibHTML/CSS/StyleSheet.h>
#include <LibHTML/Parser/CSSParser.h>
#include <ctype.h>
#include <stdio.h>
static Optional<Color> parse_css_color(const StringView& view)
{
auto color = Color::from_string(view);
if (color.has_value())
return color;
// FIXME: Parse all valid color strings :^)
return {};
}
NonnullRefPtr<StyleValue> parse_css_value(const StringView& view)
{
String string(view);
bool ok;
int as_int = string.to_int(ok);
if (ok)
return LengthStyleValue::create(Length(as_int, Length::Type::Absolute));
unsigned as_uint = string.to_uint(ok);
if (ok)
return LengthStyleValue::create(Length(as_uint, Length::Type::Absolute));
if (string == "inherit")
return InheritStyleValue::create();
if (string == "initial")
return InitialStyleValue::create();
if (string == "auto")
return LengthStyleValue::create(Length());
auto color = parse_css_color(view);
if (color.has_value())
return ColorStyleValue::create(color.value());
return StringStyleValue::create(string);
}
NonnullRefPtr<StyleSheet> parse_css(const String& css)
{
NonnullRefPtrVector<StyleRule> rules;
enum class State {
Free,
InSelectorComponent,
InPropertyName,
InPropertyValue,
};
struct CurrentRule {
Vector<Selector> selectors;
NonnullRefPtrVector<StyleDeclaration> declarations;
};
CurrentRule current_rule;
Vector<char> buffer;
int index = 0;
auto peek = [&]() -> char {
if (index < css.length())
return css[index];
return 0;
};
auto consume_specific = [&](char ch) {
ASSERT(peek() == ch);
++index;
return ch;
};
auto consume_one = [&]() -> char {
return css[index++];
};
auto consume_whitespace = [&] {
while (isspace(peek()))
++index;
};
auto is_valid_selector_char = [](char ch) {
return isalnum(ch) || ch == '-' || ch == '_';
};
auto parse_selector = [&] {
consume_whitespace();
Selector::Component::Type type;
if (peek() == '.')
type = Selector::Component::Type::Class;
else if (peek() == '#')
type = Selector::Component::Type::Id;
else
type = Selector::Component::Type::TagName;
while (is_valid_selector_char(peek()))
buffer.append(consume_one());
ASSERT(!buffer.is_null());
auto component_string = String::copy(buffer);
Vector<Selector::Component> components;
components.append({ type, component_string });
buffer.clear();
current_rule.selectors.append(Selector(move(components)));
};
auto parse_selector_list = [&] {
for (;;) {
parse_selector();
consume_whitespace();
if (peek() == ',') {
consume_one();
continue;
}
if (peek() == '{')
break;
}
};
auto is_valid_property_name_char = [](char ch) {
return !isspace(ch) && ch != ':';
};
auto is_valid_property_value_char = [](char ch) {
return !isspace(ch) && ch != ';';
};
auto parse_declaration = [&] {
consume_whitespace();
buffer.clear();
while (is_valid_property_name_char(peek()))
buffer.append(consume_one());
auto property_name = String::copy(buffer);
buffer.clear();
consume_whitespace();
consume_specific(':');
consume_whitespace();
while (is_valid_property_value_char(peek()))
buffer.append(consume_one());
auto property_value = String::copy(buffer);
buffer.clear();
consume_specific(';');
current_rule.declarations.append(StyleDeclaration::create(property_name, parse_css_value(property_value)));
};
auto parse_declarations = [&] {
for (;;) {
parse_declaration();
consume_whitespace();
if (peek() == '}')
break;
}
};
auto parse_rule = [&] {
parse_selector_list();
consume_specific('{');
parse_declarations();
consume_specific('}');
rules.append(StyleRule::create(move(current_rule.selectors), move(current_rule.declarations)));
};
while (index < css.length()) {
parse_rule();
}
return StyleSheet::create(move(rules));
}
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