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/*
* Copyright (c) 2020, Matthew Olsson <mattco@serenityos.org>
* Copyright (c) 2022, Sam Atkins <atkinssj@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/String.h>
#include <AK/Vector.h>
#include <LibGfx/Point.h>
namespace Web::SVG {
enum class PathInstructionType {
Move,
ClosePath,
Line,
HorizontalLine,
VerticalLine,
Curve,
SmoothCurve,
QuadraticBezierCurve,
SmoothQuadraticBezierCurve,
EllipticalArc,
Invalid,
};
struct PathInstruction {
PathInstructionType type;
bool absolute;
Vector<float> data;
};
class AttributeParser final {
public:
~AttributeParser() = default;
static Optional<float> parse_coordinate(StringView input);
static Optional<float> parse_length(StringView input);
static Optional<float> parse_positive_length(StringView input);
static Vector<Gfx::FloatPoint> parse_points(StringView input);
static Vector<PathInstruction> parse_path_data(StringView input);
private:
AttributeParser(StringView source);
void parse_drawto();
void parse_moveto();
void parse_closepath();
void parse_lineto();
void parse_horizontal_lineto();
void parse_vertical_lineto();
void parse_curveto();
void parse_smooth_curveto();
void parse_quadratic_bezier_curveto();
void parse_smooth_quadratic_bezier_curveto();
void parse_elliptical_arc();
float parse_length();
float parse_coordinate();
Vector<float> parse_coordinate_pair();
Vector<float> parse_coordinate_sequence();
Vector<Vector<float>> parse_coordinate_pair_sequence();
Vector<float> parse_coordinate_pair_double();
Vector<float> parse_coordinate_pair_triplet();
Vector<float> parse_elliptical_arg_argument();
void parse_whitespace(bool must_match_once = false);
void parse_comma_whitespace();
float parse_fractional_constant();
float parse_number();
float parse_nonnegative_number();
float parse_flag();
// -1 if negative, +1 otherwise
int parse_sign();
bool match_whitespace() const;
bool match_comma_whitespace() const;
bool match_coordinate() const;
bool match_length() const;
bool match(char c) const { return !done() && ch() == c; }
bool done() const { return m_cursor >= m_source.length(); }
char ch() const { return m_source[m_cursor]; }
char consume() { return m_source[m_cursor++]; }
StringView m_source;
size_t m_cursor { 0 };
Vector<PathInstruction> m_instructions;
};
}
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