mirror of
https://github.com/RGBCube/serenity
synced 2025-05-31 18:28:12 +00:00
LibWeb: Move SVG::PathDataParser into its own file and rename it
I've chosen the name `AttributeParser` since it parses data from attributes. Rather than duplicate the parsing of numbers and other basic types, let's make use of this existing parsing code for parsing the data for `<line>`, `<polyline>`, etc.
This commit is contained in:
Sam Atkins
Andreas Kling
parent
784c3183f7
commit
82308fb71a
5 changed files with 455 additions and 426 deletions
367
Userland/Libraries/LibWeb/SVG/AttributeParser.cpp
Normal file
367
Userland/Libraries/LibWeb/SVG/AttributeParser.cpp
Normal file
|
|
@ -0,0 +1,367 @@
|
|||
/*
|
||||
* Copyright (c) 2020, Matthew Olsson <mattco@serenityos.org>
|
||||
* Copyright (c) 2022, Sam Atkins <atkinssj@serenityos.org>
|
||||
*
|
||||
* SPDX-License-Identifier: BSD-2-Clause
|
||||
*/
|
||||
|
||||
#include "AttributeParser.h"
|
||||
#include <AK/StringBuilder.h>
|
||||
#include <ctype.h>
|
||||
|
||||
namespace Web::SVG {
|
||||
|
||||
AttributeParser::AttributeParser(String source)
|
||||
: m_source(move(source))
|
||||
{
|
||||
}
|
||||
|
||||
Vector<PathInstruction> AttributeParser::parse_path_data()
|
||||
{
|
||||
parse_whitespace();
|
||||
while (!done())
|
||||
parse_drawto();
|
||||
if (!m_instructions.is_empty() && m_instructions[0].type != PathInstructionType::Move)
|
||||
VERIFY_NOT_REACHED();
|
||||
return m_instructions;
|
||||
}
|
||||
|
||||
void AttributeParser::parse_drawto()
|
||||
{
|
||||
if (match('M') || match('m')) {
|
||||
parse_moveto();
|
||||
} else if (match('Z') || match('z')) {
|
||||
parse_closepath();
|
||||
} else if (match('L') || match('l')) {
|
||||
parse_lineto();
|
||||
} else if (match('H') || match('h')) {
|
||||
parse_horizontal_lineto();
|
||||
} else if (match('V') || match('v')) {
|
||||
parse_vertical_lineto();
|
||||
} else if (match('C') || match('c')) {
|
||||
parse_curveto();
|
||||
} else if (match('S') || match('s')) {
|
||||
parse_smooth_curveto();
|
||||
} else if (match('Q') || match('q')) {
|
||||
parse_quadratic_bezier_curveto();
|
||||
} else if (match('T') || match('t')) {
|
||||
parse_smooth_quadratic_bezier_curveto();
|
||||
} else if (match('A') || match('a')) {
|
||||
parse_elliptical_arc();
|
||||
} else {
|
||||
dbgln("AttributeParser::parse_drawto failed to match: '{}'", ch());
|
||||
TODO();
|
||||
}
|
||||
}
|
||||
|
||||
void AttributeParser::parse_moveto()
|
||||
{
|
||||
bool absolute = consume() == 'M';
|
||||
parse_whitespace();
|
||||
for (auto& pair : parse_coordinate_pair_sequence())
|
||||
m_instructions.append({ PathInstructionType::Move, absolute, pair });
|
||||
}
|
||||
|
||||
void AttributeParser::parse_closepath()
|
||||
{
|
||||
bool absolute = consume() == 'Z';
|
||||
parse_whitespace();
|
||||
m_instructions.append({ PathInstructionType::ClosePath, absolute, {} });
|
||||
}
|
||||
|
||||
void AttributeParser::parse_lineto()
|
||||
{
|
||||
bool absolute = consume() == 'L';
|
||||
parse_whitespace();
|
||||
for (auto& pair : parse_coordinate_pair_sequence())
|
||||
m_instructions.append({ PathInstructionType::Line, absolute, pair });
|
||||
}
|
||||
|
||||
void AttributeParser::parse_horizontal_lineto()
|
||||
{
|
||||
bool absolute = consume() == 'H';
|
||||
parse_whitespace();
|
||||
m_instructions.append({ PathInstructionType::HorizontalLine, absolute, parse_coordinate_sequence() });
|
||||
}
|
||||
|
||||
void AttributeParser::parse_vertical_lineto()
|
||||
{
|
||||
bool absolute = consume() == 'V';
|
||||
parse_whitespace();
|
||||
m_instructions.append({ PathInstructionType::VerticalLine, absolute, parse_coordinate_sequence() });
|
||||
}
|
||||
|
||||
void AttributeParser::parse_curveto()
|
||||
{
|
||||
bool absolute = consume() == 'C';
|
||||
parse_whitespace();
|
||||
|
||||
while (true) {
|
||||
m_instructions.append({ PathInstructionType::Curve, absolute, parse_coordinate_pair_triplet() });
|
||||
if (match_comma_whitespace())
|
||||
parse_comma_whitespace();
|
||||
if (!match_coordinate())
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
void AttributeParser::parse_smooth_curveto()
|
||||
{
|
||||
bool absolute = consume() == 'S';
|
||||
parse_whitespace();
|
||||
|
||||
while (true) {
|
||||
m_instructions.append({ PathInstructionType::SmoothCurve, absolute, parse_coordinate_pair_double() });
|
||||
if (match_comma_whitespace())
|
||||
parse_comma_whitespace();
|
||||
if (!match_coordinate())
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
void AttributeParser::parse_quadratic_bezier_curveto()
|
||||
{
|
||||
bool absolute = consume() == 'Q';
|
||||
parse_whitespace();
|
||||
|
||||
while (true) {
|
||||
m_instructions.append({ PathInstructionType::QuadraticBezierCurve, absolute, parse_coordinate_pair_double() });
|
||||
if (match_comma_whitespace())
|
||||
parse_comma_whitespace();
|
||||
if (!match_coordinate())
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
void AttributeParser::parse_smooth_quadratic_bezier_curveto()
|
||||
{
|
||||
bool absolute = consume() == 'T';
|
||||
parse_whitespace();
|
||||
|
||||
while (true) {
|
||||
m_instructions.append({ PathInstructionType::SmoothQuadraticBezierCurve, absolute, parse_coordinate_pair() });
|
||||
if (match_comma_whitespace())
|
||||
parse_comma_whitespace();
|
||||
if (!match_coordinate())
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
void AttributeParser::parse_elliptical_arc()
|
||||
{
|
||||
bool absolute = consume() == 'A';
|
||||
parse_whitespace();
|
||||
|
||||
while (true) {
|
||||
m_instructions.append({ PathInstructionType::EllipticalArc, absolute, parse_elliptical_arg_argument() });
|
||||
if (match_comma_whitespace())
|
||||
parse_comma_whitespace();
|
||||
if (!match_coordinate())
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
float AttributeParser::parse_coordinate()
|
||||
{
|
||||
return parse_sign() * parse_number();
|
||||
}
|
||||
|
||||
Vector<float> AttributeParser::parse_coordinate_pair()
|
||||
{
|
||||
Vector<float> coordinates;
|
||||
coordinates.append(parse_coordinate());
|
||||
if (match_comma_whitespace())
|
||||
parse_comma_whitespace();
|
||||
coordinates.append(parse_coordinate());
|
||||
return coordinates;
|
||||
}
|
||||
|
||||
Vector<float> AttributeParser::parse_coordinate_sequence()
|
||||
{
|
||||
Vector<float> sequence;
|
||||
while (true) {
|
||||
sequence.append(parse_coordinate());
|
||||
if (match_comma_whitespace())
|
||||
parse_comma_whitespace();
|
||||
if (!match_comma_whitespace() && !match_coordinate())
|
||||
break;
|
||||
}
|
||||
return sequence;
|
||||
}
|
||||
|
||||
Vector<Vector<float>> AttributeParser::parse_coordinate_pair_sequence()
|
||||
{
|
||||
Vector<Vector<float>> sequence;
|
||||
while (true) {
|
||||
sequence.append(parse_coordinate_pair());
|
||||
if (match_comma_whitespace())
|
||||
parse_comma_whitespace();
|
||||
if (!match_comma_whitespace() && !match_coordinate())
|
||||
break;
|
||||
}
|
||||
return sequence;
|
||||
}
|
||||
|
||||
Vector<float> AttributeParser::parse_coordinate_pair_double()
|
||||
{
|
||||
Vector<float> coordinates;
|
||||
coordinates.extend(parse_coordinate_pair());
|
||||
if (match_comma_whitespace())
|
||||
parse_comma_whitespace();
|
||||
coordinates.extend(parse_coordinate_pair());
|
||||
return coordinates;
|
||||
}
|
||||
|
||||
Vector<float> AttributeParser::parse_coordinate_pair_triplet()
|
||||
{
|
||||
Vector<float> coordinates;
|
||||
coordinates.extend(parse_coordinate_pair());
|
||||
if (match_comma_whitespace())
|
||||
parse_comma_whitespace();
|
||||
coordinates.extend(parse_coordinate_pair());
|
||||
if (match_comma_whitespace())
|
||||
parse_comma_whitespace();
|
||||
coordinates.extend(parse_coordinate_pair());
|
||||
return coordinates;
|
||||
}
|
||||
|
||||
Vector<float> AttributeParser::parse_elliptical_arg_argument()
|
||||
{
|
||||
Vector<float> numbers;
|
||||
numbers.append(parse_number());
|
||||
if (match_comma_whitespace())
|
||||
parse_comma_whitespace();
|
||||
numbers.append(parse_number());
|
||||
if (match_comma_whitespace())
|
||||
parse_comma_whitespace();
|
||||
numbers.append(parse_number());
|
||||
parse_comma_whitespace();
|
||||
numbers.append(parse_flag());
|
||||
if (match_comma_whitespace())
|
||||
parse_comma_whitespace();
|
||||
numbers.append(parse_flag());
|
||||
if (match_comma_whitespace())
|
||||
parse_comma_whitespace();
|
||||
numbers.extend(parse_coordinate_pair());
|
||||
|
||||
return numbers;
|
||||
}
|
||||
|
||||
void AttributeParser::parse_whitespace(bool must_match_once)
|
||||
{
|
||||
bool matched = false;
|
||||
while (!done() && match_whitespace()) {
|
||||
consume();
|
||||
matched = true;
|
||||
}
|
||||
|
||||
VERIFY(!must_match_once || matched);
|
||||
}
|
||||
|
||||
void AttributeParser::parse_comma_whitespace()
|
||||
{
|
||||
if (match(',')) {
|
||||
consume();
|
||||
parse_whitespace();
|
||||
} else {
|
||||
parse_whitespace(1);
|
||||
if (match(','))
|
||||
consume();
|
||||
parse_whitespace();
|
||||
}
|
||||
}
|
||||
|
||||
float AttributeParser::parse_fractional_constant()
|
||||
{
|
||||
StringBuilder builder;
|
||||
bool floating_point = false;
|
||||
|
||||
while (!done() && isdigit(ch()))
|
||||
builder.append(consume());
|
||||
|
||||
if (match('.')) {
|
||||
floating_point = true;
|
||||
builder.append('.');
|
||||
consume();
|
||||
while (!done() && isdigit(ch()))
|
||||
builder.append(consume());
|
||||
} else {
|
||||
VERIFY(builder.length() > 0);
|
||||
}
|
||||
|
||||
if (floating_point)
|
||||
return strtof(builder.to_string().characters(), nullptr);
|
||||
return builder.to_string().to_int().value();
|
||||
}
|
||||
|
||||
float AttributeParser::parse_number()
|
||||
{
|
||||
auto number = parse_fractional_constant();
|
||||
|
||||
if (!match('e') && !match('E'))
|
||||
return number;
|
||||
consume();
|
||||
|
||||
auto exponent_sign = parse_sign();
|
||||
|
||||
StringBuilder exponent_builder;
|
||||
while (!done() && isdigit(ch()))
|
||||
exponent_builder.append(consume());
|
||||
VERIFY(exponent_builder.length() > 0);
|
||||
|
||||
auto exponent = exponent_builder.to_string().to_int().value();
|
||||
|
||||
// Fast path: If the number is 0, there's no point in computing the exponentiation.
|
||||
if (number == 0)
|
||||
return number;
|
||||
|
||||
if (exponent_sign < 0) {
|
||||
for (int i = 0; i < exponent; ++i) {
|
||||
number /= 10;
|
||||
}
|
||||
} else if (exponent_sign > 0) {
|
||||
for (int i = 0; i < exponent; ++i) {
|
||||
number *= 10;
|
||||
}
|
||||
}
|
||||
|
||||
return number;
|
||||
}
|
||||
|
||||
float AttributeParser::parse_flag()
|
||||
{
|
||||
if (!match('0') && !match('1'))
|
||||
VERIFY_NOT_REACHED();
|
||||
return consume() - '0';
|
||||
}
|
||||
|
||||
int AttributeParser::parse_sign()
|
||||
{
|
||||
if (match('-')) {
|
||||
consume();
|
||||
return -1;
|
||||
}
|
||||
if (match('+'))
|
||||
consume();
|
||||
return 1;
|
||||
}
|
||||
|
||||
bool AttributeParser::match_whitespace() const
|
||||
{
|
||||
if (done())
|
||||
return false;
|
||||
char c = ch();
|
||||
return c == 0x9 || c == 0x20 || c == 0xa || c == 0xc || c == 0xd;
|
||||
}
|
||||
|
||||
bool AttributeParser::match_comma_whitespace() const
|
||||
{
|
||||
return match_whitespace() || match(',');
|
||||
}
|
||||
|
||||
bool AttributeParser::match_coordinate() const
|
||||
{
|
||||
return !done() && (isdigit(ch()) || ch() == '-' || ch() == '+' || ch() == '.');
|
||||
}
|
||||
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue