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ladybird/Userland/Libraries/LibWeb/CSS/Parser/CSSParser.cpp
Andreas Kling 5d180d1f99 Everywhere: Rename ASSERT => VERIFY 
(...and ASSERT_NOT_REACHED => VERIFY_NOT_REACHED)

Since all of these checks are done in release builds as well,
let's rename them to VERIFY to prevent confusion, as everyone is
used to assertions being compiled out in release.

We can introduce a new ASSERT macro that is specifically for debug
checks, but I'm doing this wholesale conversion first since we've
accumulated thousands of these already, and it's not immediately
obvious which ones are suitable for ASSERT.
2021-02-23 20:56:54 +01:00

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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <AK/HashMap.h>
#include <LibWeb/CSS/Parser/CSSParser.h>
#include <LibWeb/CSS/PropertyID.h>
#include <LibWeb/CSS/StyleSheet.h>
#include <LibWeb/DOM/Document.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#define PARSE_VERIFY(x) \
if (!(x)) { \
dbgln("CSS PARSER ASSERTION FAILED: {}", #x); \
dbgln("At character# {} in CSS: _{}_", index, css); \
VERIFY_NOT_REACHED(); \
}
#define PARSE_ERROR() \
do { \
dbgln("CSS parse error"); \
} while (0)
namespace Web {
namespace CSS {
ParsingContext::ParsingContext()
{
}
ParsingContext::ParsingContext(const DOM::Document& document)
: m_document(&document)
{
}
ParsingContext::ParsingContext(const DOM::ParentNode& parent_node)
: m_document(&parent_node.document())
{
}
bool ParsingContext::in_quirks_mode() const
{
return m_document ? m_document->in_quirks_mode() : false;
}
}
static Optional<Color> parse_css_color(const CSS::ParsingContext&, const StringView& view)
{
if (view.equals_ignoring_case("transparent"))
return Color::from_rgba(0x00000000);
auto color = Color::from_string(view.to_string().to_lowercase());
if (color.has_value())
return color;
return {};
}
static Optional<float> try_parse_float(const StringView& string)
{
const char* str = string.characters_without_null_termination();
size_t len = string.length();
size_t weight = 1;
int exp_val = 0;
float value = 0.0f;
float fraction = 0.0f;
bool has_sign = false;
bool is_negative = false;
bool is_fractional = false;
bool is_scientific = false;
if (str[0] == '-') {
is_negative = true;
has_sign = true;
}
if (str[0] == '+') {
has_sign = true;
}
for (size_t i = has_sign; i < len; i++) {
// Looks like we're about to start working on the fractional part
if (str[i] == '.') {
is_fractional = true;
continue;
}
if (str[i] == 'e' || str[i] == 'E') {
if (str[i + 1] == '-' || str[i + 1] == '+')
exp_val = atoi(str + i + 2);
else
exp_val = atoi(str + i + 1);
is_scientific = true;
continue;
}
if (str[i] < '0' || str[i] > '9' || exp_val != 0) {
return {};
continue;
}
if (is_fractional) {
fraction *= 10;
fraction += str[i] - '0';
weight *= 10;
} else {
value = value * 10;
value += str[i] - '0';
}
}
fraction /= weight;
value += fraction;
if (is_scientific) {
bool divide = exp_val < 0;
if (divide)
exp_val *= -1;
for (int i = 0; i < exp_val; i++) {
if (divide)
value /= 10;
else
value *= 10;
}
}
return is_negative ? -value : value;
}
static CSS::Length parse_length(const CSS::ParsingContext& context, const StringView& view, bool& is_bad_length)
{
CSS::Length::Type type = CSS::Length::Type::Undefined;
Optional<float> value;
if (view.ends_with('%')) {
type = CSS::Length::Type::Percentage;
value = try_parse_float(view.substring_view(0, view.length() - 1));
} else if (view.ends_with("px", CaseSensitivity::CaseInsensitive)) {
type = CSS::Length::Type::Px;
value = try_parse_float(view.substring_view(0, view.length() - 2));
} else if (view.ends_with("pt", CaseSensitivity::CaseInsensitive)) {
type = CSS::Length::Type::Pt;
value = try_parse_float(view.substring_view(0, view.length() - 2));
} else if (view.ends_with("pc", CaseSensitivity::CaseInsensitive)) {
type = CSS::Length::Type::Pc;
value = try_parse_float(view.substring_view(0, view.length() - 2));
} else if (view.ends_with("mm", CaseSensitivity::CaseInsensitive)) {
type = CSS::Length::Type::Mm;
value = try_parse_float(view.substring_view(0, view.length() - 2));
} else if (view.ends_with("rem", CaseSensitivity::CaseInsensitive)) {
type = CSS::Length::Type::Rem;
value = try_parse_float(view.substring_view(0, view.length() - 3));
} else if (view.ends_with("em", CaseSensitivity::CaseInsensitive)) {
type = CSS::Length::Type::Em;
value = try_parse_float(view.substring_view(0, view.length() - 2));
} else if (view.ends_with("ex", CaseSensitivity::CaseInsensitive)) {
type = CSS::Length::Type::Ex;
value = try_parse_float(view.substring_view(0, view.length() - 2));
} else if (view.ends_with("vw", CaseSensitivity::CaseInsensitive)) {
type = CSS::Length::Type::Vw;
value = try_parse_float(view.substring_view(0, view.length() - 2));
} else if (view.ends_with("vh", CaseSensitivity::CaseInsensitive)) {
type = CSS::Length::Type::Vh;
value = try_parse_float(view.substring_view(0, view.length() - 2));
} else if (view.ends_with("vmax", CaseSensitivity::CaseInsensitive)) {
type = CSS::Length::Type::Vmax;
value = try_parse_float(view.substring_view(0, view.length() - 4));
} else if (view.ends_with("vmin", CaseSensitivity::CaseInsensitive)) {
type = CSS::Length::Type::Vmin;
value = try_parse_float(view.substring_view(0, view.length() - 4));
} else if (view.ends_with("cm", CaseSensitivity::CaseInsensitive)) {
type = CSS::Length::Type::Cm;
value = try_parse_float(view.substring_view(0, view.length() - 2));
} else if (view.ends_with("in", CaseSensitivity::CaseInsensitive)) {
type = CSS::Length::Type::In;
value = try_parse_float(view.substring_view(0, view.length() - 2));
} else if (view.ends_with("Q", CaseSensitivity::CaseInsensitive)) {
type = CSS::Length::Type::Q;
value = try_parse_float(view.substring_view(0, view.length() - 1));
} else if (view == "0") {
type = CSS::Length::Type::Px;
value = 0;
} else if (context.in_quirks_mode()) {
type = CSS::Length::Type::Px;
value = try_parse_float(view);
} else {
value = try_parse_float(view);
if (value.has_value())
is_bad_length = true;
}
if (!value.has_value())
return {};
return CSS::Length(value.value(), type);
}
static bool takes_integer_value(CSS::PropertyID property_id)
{
return property_id == CSS::PropertyID::ZIndex || property_id == CSS::PropertyID::FontWeight;
}
RefPtr<CSS::StyleValue> parse_css_value(const CSS::ParsingContext& context, const StringView& string, CSS::PropertyID property_id)
{
bool is_bad_length = false;
if (takes_integer_value(property_id)) {
auto integer = string.to_int();
if (integer.has_value())
return CSS::LengthStyleValue::create(CSS::Length::make_px(integer.value()));
}
auto length = parse_length(context, string, is_bad_length);
if (is_bad_length)
return nullptr;
if (!length.is_undefined())
return CSS::LengthStyleValue::create(length);
if (string.equals_ignoring_case("inherit"))
return CSS::InheritStyleValue::create();
if (string.equals_ignoring_case("initial"))
return CSS::InitialStyleValue::create();
if (string.equals_ignoring_case("auto"))
return CSS::LengthStyleValue::create(CSS::Length::make_auto());
auto value_id = CSS::value_id_from_string(string);
if (value_id != CSS::ValueID::Invalid)
return CSS::IdentifierStyleValue::create(value_id);
auto color = parse_css_color(context, string);
if (color.has_value())
return CSS::ColorStyleValue::create(color.value());
return CSS::StringStyleValue::create(string);
}
RefPtr<CSS::LengthStyleValue> parse_line_width(const CSS::ParsingContext& context, const StringView& part)
{
auto value = parse_css_value(context, part);
if (value && value->is_length())
return static_ptr_cast<CSS::LengthStyleValue>(value);
return nullptr;
}
RefPtr<CSS::ColorStyleValue> parse_color(const CSS::ParsingContext& context, const StringView& part)
{
auto value = parse_css_value(context, part);
if (value && value->is_color())
return static_ptr_cast<CSS::ColorStyleValue>(value);
return nullptr;
}
RefPtr<CSS::StringStyleValue> parse_line_style(const CSS::ParsingContext& context, const StringView& part)
{
auto parsed_value = parse_css_value(context, part);
if (!parsed_value || !parsed_value->is_string())
return nullptr;
auto value = static_ptr_cast<CSS::StringStyleValue>(parsed_value);
if (value->to_string() == "dotted")
return value;
if (value->to_string() == "dashed")
return value;
if (value->to_string() == "solid")
return value;
if (value->to_string() == "double")
return value;
if (value->to_string() == "groove")
return value;
if (value->to_string() == "ridge")
return value;
return nullptr;
}
class CSSParser {
public:
CSSParser(const CSS::ParsingContext& context, const StringView& input)
: m_context(context)
, css(input)
{
}
bool next_is(const char* str) const
{
size_t len = strlen(str);
for (size_t i = 0; i < len; ++i) {
if (peek(i) != str[i])
return false;
}
return true;
}
char peek(size_t offset = 0) const
{
if ((index + offset) < css.length())
return css[index + offset];
return 0;
}
bool consume_specific(char ch)
{
if (peek() != ch) {
dbgln("CSSParser: Peeked '{:c}' wanted specific '{:c}'", peek(), ch);
}
if (!peek()) {
PARSE_ERROR();
return false;
}
if (peek() != ch) {
PARSE_ERROR();
++index;
return false;
}
++index;
return true;
}
char consume_one()
{
PARSE_VERIFY(index < css.length());
return css[index++];
};
bool consume_whitespace_or_comments()
{
size_t original_index = index;
bool in_comment = false;
for (; index < css.length(); ++index) {
char ch = peek();
if (isspace(ch))
continue;
if (!in_comment && ch == '/' && peek(1) == '*') {
in_comment = true;
++index;
continue;
}
if (in_comment && ch == '*' && peek(1) == '/') {
in_comment = false;
++index;
continue;
}
if (in_comment)
continue;
break;
}
return original_index != index;
}
bool is_valid_selector_char(char ch) const
{
return isalnum(ch) || ch == '-' || ch == '_' || ch == '(' || ch == ')' || ch == '@';
}
bool is_combinator(char ch) const
{
return ch == '~' || ch == '>' || ch == '+';
}
Optional<CSS::Selector::SimpleSelector> parse_simple_selector()
{
auto index_at_start = index;
if (consume_whitespace_or_comments())
return {};
if (!peek() || peek() == '{' || peek() == ',' || is_combinator(peek()))
return {};
CSS::Selector::SimpleSelector::Type type;
if (peek() == '*') {
type = CSS::Selector::SimpleSelector::Type::Universal;
consume_one();
return CSS::Selector::SimpleSelector {
type,
CSS::Selector::SimpleSelector::PseudoClass::None,
CSS::Selector::SimpleSelector::PseudoElement::None,
String(),
CSS::Selector::SimpleSelector::AttributeMatchType::None,
String(),
String()
};
}
if (peek() == '.') {
type = CSS::Selector::SimpleSelector::Type::Class;
consume_one();
} else if (peek() == '#') {
type = CSS::Selector::SimpleSelector::Type::Id;
consume_one();
} else if (isalpha(peek())) {
type = CSS::Selector::SimpleSelector::Type::TagName;
} else {
type = CSS::Selector::SimpleSelector::Type::Universal;
}
if (type != CSS::Selector::SimpleSelector::Type::Universal) {
while (is_valid_selector_char(peek()))
buffer.append(consume_one());
PARSE_VERIFY(!buffer.is_null());
}
auto value = String::copy(buffer);
if (type == CSS::Selector::SimpleSelector::Type::TagName) {
// Some stylesheets use uppercase tag names, so here's a hack to just lowercase them internally.
value = value.to_lowercase();
}
CSS::Selector::SimpleSelector simple_selector {
type,
CSS::Selector::SimpleSelector::PseudoClass::None,
CSS::Selector::SimpleSelector::PseudoElement::None,
value,
CSS::Selector::SimpleSelector::AttributeMatchType::None,
String(),
String()
};
buffer.clear();
if (peek() == '[') {
CSS::Selector::SimpleSelector::AttributeMatchType attribute_match_type = CSS::Selector::SimpleSelector::AttributeMatchType::HasAttribute;
String attribute_name;
String attribute_value;
bool in_value = false;
consume_specific('[');
char expected_end_of_attribute_selector = ']';
while (peek() != expected_end_of_attribute_selector) {
char ch = consume_one();
if (ch == '=' || (ch == '~' && peek() == '=')) {
if (ch == '=') {
attribute_match_type = CSS::Selector::SimpleSelector::AttributeMatchType::ExactValueMatch;
} else if (ch == '~') {
consume_one();
attribute_match_type = CSS::Selector::SimpleSelector::AttributeMatchType::Contains;
}
attribute_name = String::copy(buffer);
buffer.clear();
in_value = true;
consume_whitespace_or_comments();
if (peek() == '\'') {
expected_end_of_attribute_selector = '\'';
consume_one();
} else if (peek() == '"') {
expected_end_of_attribute_selector = '"';
consume_one();
}
continue;
}
// FIXME: This is a hack that will go away when we replace this with a big boy CSS parser.
if (ch == '\\')
ch = consume_one();
buffer.append(ch);
}
if (in_value)
attribute_value = String::copy(buffer);
else
attribute_name = String::copy(buffer);
buffer.clear();
simple_selector.attribute_match_type = attribute_match_type;
simple_selector.attribute_name = attribute_name;
simple_selector.attribute_value = attribute_value;
if (expected_end_of_attribute_selector != ']') {
if (!consume_specific(expected_end_of_attribute_selector))
return {};
}
consume_whitespace_or_comments();
if (!consume_specific(']'))
return {};
}
if (peek() == ':') {
// FIXME: Implement pseudo elements.
[[maybe_unused]] bool is_pseudo_element = false;
consume_one();
if (peek() == ':') {
is_pseudo_element = true;
consume_one();
}
if (next_is("not")) {
buffer.append(consume_one());
buffer.append(consume_one());
buffer.append(consume_one());
if (!consume_specific('('))
return {};
buffer.append('(');
while (peek() != ')')
buffer.append(consume_one());
if (!consume_specific(')'))
return {};
buffer.append(')');
} else {
while (is_valid_selector_char(peek()))
buffer.append(consume_one());
}
auto pseudo_name = String::copy(buffer);
buffer.clear();
// Ignore for now, otherwise we produce a "false positive" selector
// and apply styles to the element itself, not its pseudo element
if (is_pseudo_element)
return {};
if (pseudo_name.equals_ignoring_case("link"))
simple_selector.pseudo_class = CSS::Selector::SimpleSelector::PseudoClass::Link;
else if (pseudo_name.equals_ignoring_case("visited"))
simple_selector.pseudo_class = CSS::Selector::SimpleSelector::PseudoClass::Visited;
else if (pseudo_name.equals_ignoring_case("hover"))
simple_selector.pseudo_class = CSS::Selector::SimpleSelector::PseudoClass::Hover;
else if (pseudo_name.equals_ignoring_case("focus"))
simple_selector.pseudo_class = CSS::Selector::SimpleSelector::PseudoClass::Focus;
else if (pseudo_name.equals_ignoring_case("first-child"))
simple_selector.pseudo_class = CSS::Selector::SimpleSelector::PseudoClass::FirstChild;
else if (pseudo_name.equals_ignoring_case("last-child"))
simple_selector.pseudo_class = CSS::Selector::SimpleSelector::PseudoClass::LastChild;
else if (pseudo_name.equals_ignoring_case("only-child"))
simple_selector.pseudo_class = CSS::Selector::SimpleSelector::PseudoClass::OnlyChild;
else if (pseudo_name.equals_ignoring_case("empty"))
simple_selector.pseudo_class = CSS::Selector::SimpleSelector::PseudoClass::Empty;
else if (pseudo_name.equals_ignoring_case("root"))
simple_selector.pseudo_class = CSS::Selector::SimpleSelector::PseudoClass::Root;
else if (pseudo_name.equals_ignoring_case("before"))
simple_selector.pseudo_element = CSS::Selector::SimpleSelector::PseudoElement::Before;
else if (pseudo_name.equals_ignoring_case("after"))
simple_selector.pseudo_element = CSS::Selector::SimpleSelector::PseudoElement::After;
}
if (index == index_at_start) {
// We consumed nothing.
return {};
}
return simple_selector;
}
Optional<CSS::Selector::ComplexSelector> parse_complex_selector()
{
auto relation = CSS::Selector::ComplexSelector::Relation::Descendant;
if (peek() == '{' || peek() == ',')
return {};
if (is_combinator(peek())) {
switch (peek()) {
case '>':
relation = CSS::Selector::ComplexSelector::Relation::ImmediateChild;
break;
case '+':
relation = CSS::Selector::ComplexSelector::Relation::AdjacentSibling;
break;
case '~':
relation = CSS::Selector::ComplexSelector::Relation::GeneralSibling;
break;
}
consume_one();
consume_whitespace_or_comments();
}
consume_whitespace_or_comments();
Vector<CSS::Selector::SimpleSelector> simple_selectors;
for (;;) {
auto component = parse_simple_selector();
if (!component.has_value())
break;
simple_selectors.append(component.value());
// If this assert triggers, we're most likely up to no good.
PARSE_VERIFY(simple_selectors.size() < 100);
}
if (simple_selectors.is_empty())
return {};
return CSS::Selector::ComplexSelector { relation, move(simple_selectors) };
}
void parse_selector()
{
Vector<CSS::Selector::ComplexSelector> complex_selectors;
for (;;) {
auto index_before = index;
auto complex_selector = parse_complex_selector();
if (complex_selector.has_value())
complex_selectors.append(complex_selector.value());
consume_whitespace_or_comments();
if (!peek() || peek() == ',' || peek() == '{')
break;
// HACK: If we didn't move forward, just let go.
if (index == index_before)
break;
}
if (complex_selectors.is_empty())
return;
complex_selectors.first().relation = CSS::Selector::ComplexSelector::Relation::None;
current_rule.selectors.append(CSS::Selector(move(complex_selectors)));
}
Optional<CSS::Selector> parse_individual_selector()
{
parse_selector();
if (current_rule.selectors.is_empty())
return {};
return current_rule.selectors.last();
}
void parse_selector_list()
{
for (;;) {
auto index_before = index;
parse_selector();
consume_whitespace_or_comments();
if (peek() == ',') {
consume_one();
continue;
}
if (peek() == '{')
break;
// HACK: If we didn't move forward, just let go.
if (index_before == index)
break;
}
}
bool is_valid_property_name_char(char ch) const
{
return ch && !isspace(ch) && ch != ':';
}
bool is_valid_property_value_char(char ch) const
{
return ch && ch != '!' && ch != ';' && ch != '}';
}
struct ValueAndImportant {
String value;
bool important { false };
};
ValueAndImportant consume_css_value()
{
buffer.clear();
int paren_nesting_level = 0;
bool important = false;
for (;;) {
char ch = peek();
if (ch == '(') {
++paren_nesting_level;
buffer.append(consume_one());
continue;
}
if (ch == ')') {
PARSE_VERIFY(paren_nesting_level > 0);
--paren_nesting_level;
buffer.append(consume_one());
continue;
}
if (paren_nesting_level > 0) {
buffer.append(consume_one());
continue;
}
if (next_is("!important")) {
consume_specific('!');
consume_specific('i');
consume_specific('m');
consume_specific('p');
consume_specific('o');
consume_specific('r');
consume_specific('t');
consume_specific('a');
consume_specific('n');
consume_specific('t');
important = true;
continue;
}
if (next_is("/*")) {
consume_whitespace_or_comments();
continue;
}
if (!ch)
break;
if (ch == '\\') {
consume_one();
buffer.append(consume_one());
continue;
}
if (ch == '}')
break;
if (ch == ';')
break;
buffer.append(consume_one());
}
// Remove trailing whitespace.
while (!buffer.is_empty() && isspace(buffer.last()))
buffer.take_last();
auto string = String::copy(buffer);
buffer.clear();
return { string, important };
}
Optional<CSS::StyleProperty> parse_property()
{
consume_whitespace_or_comments();
if (peek() == ';') {
consume_one();
return {};
}
if (peek() == '}')
return {};
buffer.clear();
while (is_valid_property_name_char(peek()))
buffer.append(consume_one());
auto property_name = String::copy(buffer);
buffer.clear();
consume_whitespace_or_comments();
if (!consume_specific(':'))
return {};
consume_whitespace_or_comments();
auto [property_value, important] = consume_css_value();
consume_whitespace_or_comments();
if (peek() && peek() != '}') {
if (!consume_specific(';'))
return {};
}
auto property_id = CSS::property_id_from_string(property_name);
if (property_id == CSS::PropertyID::Invalid) {
dbgln("CSSParser: Unrecognized property '{}'", property_name);
}
auto value = parse_css_value(m_context, property_value, property_id);
if (!value)
return {};
return CSS::StyleProperty { property_id, value.release_nonnull(), important };
}
void parse_declaration()
{
for (;;) {
auto property = parse_property();
if (property.has_value())
current_rule.properties.append(property.value());
consume_whitespace_or_comments();
if (!peek() || peek() == '}')
break;
}
}
void parse_rule()
{
consume_whitespace_or_comments();
if (!peek())
return;
// FIXME: We ignore @-rules for now.
if (peek() == '@') {
while (peek() != '{')
consume_one();
int level = 0;
for (;;) {
auto ch = consume_one();
if (ch == '{') {
++level;
} else if (ch == '}') {
--level;
if (level == 0)
break;
}
}
consume_whitespace_or_comments();
return;
}
parse_selector_list();
if (!consume_specific('{')) {
PARSE_ERROR();
return;
}
parse_declaration();
if (!consume_specific('}')) {
PARSE_ERROR();
return;
}
rules.append(CSS::StyleRule::create(move(current_rule.selectors), CSS::StyleDeclaration::create(move(current_rule.properties))));
consume_whitespace_or_comments();
}
RefPtr<CSS::StyleSheet> parse_sheet()
{
if (peek(0) == (char)0xef && peek(1) == (char)0xbb && peek(2) == (char)0xbf) {
// HACK: Skip UTF-8 BOM.
index += 3;
}
while (peek()) {
parse_rule();
}
return CSS::StyleSheet::create(move(rules));
}
RefPtr<CSS::StyleDeclaration> parse_standalone_declaration()
{
consume_whitespace_or_comments();
for (;;) {
auto property = parse_property();
if (property.has_value())
current_rule.properties.append(property.value());
consume_whitespace_or_comments();
if (!peek())
break;
}
return CSS::StyleDeclaration::create(move(current_rule.properties));
}
private:
CSS::ParsingContext m_context;
NonnullRefPtrVector<CSS::StyleRule> rules;
struct CurrentRule {
Vector<CSS::Selector> selectors;
Vector<CSS::StyleProperty> properties;
};
CurrentRule current_rule;
Vector<char> buffer;
size_t index = 0;
StringView css;
};
Optional<CSS::Selector> parse_selector(const CSS::ParsingContext& context, const StringView& selector_text)
{
CSSParser parser(context, selector_text);
return parser.parse_individual_selector();
}
RefPtr<CSS::StyleSheet> parse_css(const CSS::ParsingContext& context, const StringView& css)
{
if (css.is_empty())
return CSS::StyleSheet::create({});
CSSParser parser(context, css);
return parser.parse_sheet();
}
RefPtr<CSS::StyleDeclaration> parse_css_declaration(const CSS::ParsingContext& context, const StringView& css)
{
if (css.is_empty())
return CSS::StyleDeclaration::create({});
CSSParser parser(context, css);
return parser.parse_standalone_declaration();
}
RefPtr<CSS::StyleValue> parse_html_length(const DOM::Document& document, const StringView& string)
{
auto integer = string.to_int();
if (integer.has_value())
return CSS::LengthStyleValue::create(CSS::Length::make_px(integer.value()));
return parse_css_value(CSS::ParsingContext(document), string);
}
}
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