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LibHTML: Implement enough of the CSS parser to parse the default stylesheet.

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This commit is contained in:
Andreas Kling 2019-06-22 21:48:21 +02:00
parent 7e1cb86da7
commit 4573eb226e
3 changed files with 71 additions and 5 deletions
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41
LibHTML/Parser/CSSParser.cpp
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@ -16,7 +16,7 @@ NonnullRefPtr<StyleSheet> parse_css(const String& css)
struct CurrentRule {
Vector<Selector> selectors;
Vector<StyleDeclaration> declarations;
Vector<NonnullRefPtr<StyleDeclaration>> declarations;
};
CurrentRule current_rule;
@ -25,8 +25,8 @@ NonnullRefPtr<StyleSheet> parse_css(const String& css)
int index = 0;
auto peek = [&]() -> char {
if (index + 1 < css.length())
return css[index + 1];
if (index < css.length())
return css[index];
return 0;
};
@ -62,8 +62,12 @@ NonnullRefPtr<StyleSheet> parse_css(const String& css)
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, String::copy(buffer) });
components.append({ type, component_string });
buffer.clear();
current_rule.selectors.append(Selector(move(components)));
};
@ -71,20 +75,46 @@ NonnullRefPtr<StyleSheet> parse_css(const String& css)
auto parse_selector_list = [&] {
for (;;) {
parse_selector();
if (peek() == ',')
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, StyleValue::parse(property_value)));
};
auto parse_declarations = [&] {
for (;;) {
parse_declaration();
consume_whitespace();
if (peek() == '}')
break;
}
@ -95,6 +125,7 @@ NonnullRefPtr<StyleSheet> parse_css(const String& css)
consume_specific('{');
parse_declarations();
consume_specific('}');
rules.append(StyleRule::create(move(current_rule.selectors), move(current_rule.declarations)));
};
while (index < css.length()) {