1/*
2 * Copyright (C) 2011 Google Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 *
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 * * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#pragma once
32
33#include "Length.h"
34#include <memory>
35#include <wtf/Ref.h>
36#include <wtf/RefCounted.h>
37#include <wtf/Vector.h>
38
39namespace WTF {
40class TextStream;
41}
42
43namespace WebCore {
44
45// Don't change these values; parsing uses them.
46enum class CalcOperator : uint8_t {
47 Add = '+',
48 Subtract = '-',
49 Multiply = '*',
50 Divide = '/',
51 Min = 0,
52 Max = 1,
53};
54
55enum class CalcExpressionNodeType : uint8_t {
56 Undefined,
57 Number,
58 Length,
59 Operation,
60 BlendLength,
61};
62
63class CalcExpressionNode {
64 WTF_MAKE_FAST_ALLOCATED;
65public:
66 explicit CalcExpressionNode(CalcExpressionNodeType = CalcExpressionNodeType::Undefined);
67 virtual ~CalcExpressionNode() = default;
68
69 CalcExpressionNodeType type() const { return m_type; }
70
71 virtual float evaluate(float maxValue) const = 0;
72 virtual bool operator==(const CalcExpressionNode&) const = 0;
73 virtual void dump(WTF::TextStream&) const = 0;
74
75private:
76 CalcExpressionNodeType m_type;
77};
78
79class CalcExpressionNumber final : public CalcExpressionNode {
80public:
81 explicit CalcExpressionNumber(float);
82
83 float value() const { return m_value; }
84
85private:
86 float evaluate(float) const override;
87 bool operator==(const CalcExpressionNode&) const override;
88 void dump(WTF::TextStream&) const override;
89
90 float m_value;
91};
92
93class CalcExpressionLength final : public CalcExpressionNode {
94public:
95 explicit CalcExpressionLength(Length);
96
97 const Length& length() const { return m_length; }
98
99private:
100 float evaluate(float maxValue) const override;
101 bool operator==(const CalcExpressionNode&) const override;
102 void dump(WTF::TextStream&) const override;
103
104 Length m_length;
105};
106
107class CalcExpressionOperation final : public CalcExpressionNode {
108public:
109 CalcExpressionOperation(Vector<std::unique_ptr<CalcExpressionNode>>&& children, CalcOperator);
110
111 CalcOperator getOperator() const { return m_operator; }
112
113 const Vector<std::unique_ptr<CalcExpressionNode>>& children() const { return m_children; }
114
115private:
116 float evaluate(float maxValue) const override;
117 bool operator==(const CalcExpressionNode&) const override;
118 void dump(WTF::TextStream&) const override;
119
120 Vector<std::unique_ptr<CalcExpressionNode>> m_children;
121 CalcOperator m_operator;
122};
123
124class CalcExpressionBlendLength final : public CalcExpressionNode {
125public:
126 CalcExpressionBlendLength(Length from, Length to, float progress);
127
128 const Length& from() const { return m_from; }
129 const Length& to() const { return m_to; }
130 float progress() const { return m_progress; }
131
132private:
133 float evaluate(float maxValue) const override;
134 bool operator==(const CalcExpressionNode&) const override;
135 void dump(WTF::TextStream&) const override;
136
137 Length m_from;
138 Length m_to;
139 float m_progress;
140};
141
142class CalculationValue : public RefCounted<CalculationValue> {
143public:
144 WEBCORE_EXPORT static Ref<CalculationValue> create(std::unique_ptr<CalcExpressionNode>, ValueRange);
145 float evaluate(float maxValue) const;
146
147 bool shouldClampToNonNegative() const { return m_shouldClampToNonNegative; }
148 const CalcExpressionNode& expression() const { return *m_expression; }
149
150private:
151 CalculationValue(std::unique_ptr<CalcExpressionNode>, ValueRange);
152
153 std::unique_ptr<CalcExpressionNode> m_expression;
154 bool m_shouldClampToNonNegative;
155};
156
157inline CalcExpressionNode::CalcExpressionNode(CalcExpressionNodeType type)
158 : m_type(type)
159{
160}
161
162inline CalculationValue::CalculationValue(std::unique_ptr<CalcExpressionNode> expression, ValueRange range)
163 : m_expression(WTFMove(expression))
164 , m_shouldClampToNonNegative(range == ValueRangeNonNegative)
165{
166}
167
168inline bool operator==(const CalculationValue& a, const CalculationValue& b)
169{
170 return a.expression() == b.expression();
171}
172
173inline CalcExpressionNumber::CalcExpressionNumber(float value)
174 : CalcExpressionNode(CalcExpressionNodeType::Number)
175 , m_value(value)
176{
177}
178
179inline bool operator==(const CalcExpressionNumber& a, const CalcExpressionNumber& b)
180{
181 return a.value() == b.value();
182}
183
184inline const CalcExpressionNumber& toCalcExpressionNumber(const CalcExpressionNode& value)
185{
186 ASSERT_WITH_SECURITY_IMPLICATION(value.type() == CalcExpressionNodeType::Number);
187 return static_cast<const CalcExpressionNumber&>(value);
188}
189
190inline CalcExpressionLength::CalcExpressionLength(Length length)
191 : CalcExpressionNode(CalcExpressionNodeType::Length)
192 , m_length(length)
193{
194}
195
196inline bool operator==(const CalcExpressionLength& a, const CalcExpressionLength& b)
197{
198 return a.length() == b.length();
199}
200
201inline const CalcExpressionLength& toCalcExpressionLength(const CalcExpressionNode& value)
202{
203 ASSERT_WITH_SECURITY_IMPLICATION(value.type() == CalcExpressionNodeType::Length);
204 return static_cast<const CalcExpressionLength&>(value);
205}
206
207inline CalcExpressionOperation::CalcExpressionOperation(Vector<std::unique_ptr<CalcExpressionNode>>&& children, CalcOperator op)
208 : CalcExpressionNode(CalcExpressionNodeType::Operation)
209 , m_children(WTFMove(children))
210 , m_operator(op)
211{
212}
213
214bool operator==(const CalcExpressionOperation&, const CalcExpressionOperation&);
215
216inline const CalcExpressionOperation& toCalcExpressionOperation(const CalcExpressionNode& value)
217{
218 ASSERT_WITH_SECURITY_IMPLICATION(value.type() == CalcExpressionNodeType::Operation);
219 return static_cast<const CalcExpressionOperation&>(value);
220}
221
222inline bool operator==(const CalcExpressionBlendLength& a, const CalcExpressionBlendLength& b)
223{
224 return a.progress() == b.progress() && a.from() == b.from() && a.to() == b.to();
225}
226
227inline const CalcExpressionBlendLength& toCalcExpressionBlendLength(const CalcExpressionNode& value)
228{
229 ASSERT_WITH_SECURITY_IMPLICATION(value.type() == CalcExpressionNodeType::BlendLength);
230 return static_cast<const CalcExpressionBlendLength&>(value);
231}
232
233WTF::TextStream& operator<<(WTF::TextStream&, const CalculationValue&);
234WTF::TextStream& operator<<(WTF::TextStream&, const CalcExpressionNode&);
235WTF::TextStream& operator<<(WTF::TextStream&, CalcOperator);
236
237} // namespace WebCore
238