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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/GenericLexer.h>
#include <AK/Variant.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;
};
struct Transform {
struct Translate {
float x;
float y;
};
struct Scale {
float x;
float y;
};
struct Rotate {
float a;
float x;
float y;
};
struct SkewX {
float a;
};
struct SkewY {
float a;
};
struct Matrix {
float a;
float b;
float c;
float d;
float e;
float f;
};
using Operation = Variant<Translate, Scale, Rotate, SkewX, SkewY, Matrix>;
Operation operation;
};
struct PreserveAspectRatio {
enum class Align {
None,
xMinYMin,
xMidYMin,
xMaxYMin,
xMinYMid,
xMidYMid,
xMaxYMid,
xMinYMax,
xMidYMax,
xMaxYMax
};
enum class MeetOrSlice {
Meet,
Slice
};
Align align { Align::xMidYMid };
MeetOrSlice meet_or_slice { MeetOrSlice::Meet };
};
enum class GradientUnits {
ObjectBoundingBox,
UserSpaceOnUse
};
class NumberPercentage {
public:
NumberPercentage(float value, bool is_percentage)
: m_value(is_percentage ? value / 100 : value)
, m_is_percentage(is_percentage)
{
}
static NumberPercentage create_percentage(float value)
{
return NumberPercentage(value, true);
}
static NumberPercentage create_number(float value)
{
return NumberPercentage(value, false);
}
float resolve_relative_to(float length);
float value() { return m_value; }
private:
float m_value;
bool m_is_percentage { false };
};
class AttributeParser final {
public:
~AttributeParser() = default;
static Optional<float> parse_coordinate(StringView input);
static Optional<float> parse_length(StringView input);
static Optional<NumberPercentage> parse_number_percentage(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);
static Optional<Vector<Transform>> parse_transform(StringView input);
static Optional<PreserveAspectRatio> parse_preserve_aspect_ratio(StringView input);
static Optional<GradientUnits> parse_gradient_units(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();
Optional<Vector<Transform>> parse_transform();
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_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_number() const;
bool match(char c) const { return !done() && ch() == c; }
bool done() const { return m_lexer.is_eof(); }
char ch() const { return m_lexer.peek(); }
char consume() { return m_lexer.consume(); }
GenericLexer m_lexer;
Vector<PathInstruction> m_instructions;
};
}
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