1// Copyright (C) 2021 The Qt Company Ltd.
2// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
3
4#ifndef QSSG_GLSLLEXER_H
5#define QSSG_GLSLLEXER_H
6
7//
8// W A R N I N G
9// -------------
10//
11// This file is not part of the Qt API. It exists purely as an
12// implementation detail. This header file may change from version to
13// version without notice, or even be removed.
14//
15// We mean it.
16//
17
18#include <QtQuick3DGlslParser/private/glsl_p.h>
19#include <QtCore/qstring.h>
20#include <qstringlist.h>
21
22QT_BEGIN_NAMESPACE
23
24namespace GLSL {
25
26class Q_QUICK3DGLSLPARSER_EXPORT Token
27{
28public:
29 int kind;
30 int position;
31 int length;
32 int line; // ### remove
33
34 union {
35 int matchingBrace;
36 int i; // integer value
37 const QString *string; // string value
38 void *ptr;
39 };
40
41 Token()
42 : kind(0), position(0), length(0), line(0), ptr(nullptr) {}
43
44 bool is(int k) const { return k == kind; }
45 bool isNot(int k) const { return k != kind; }
46
47 int begin() const { return position; }
48 int end() const { return position + length; }
49};
50
51class Q_QUICK3DGLSLPARSER_EXPORT Lexer
52{
53public:
54 Lexer(Engine *engine, const char *source, unsigned size);
55 ~Lexer();
56
57 enum Variant {
58 // Extra flag bits added to tokens by Lexer::classify() that
59 // indicate which variant of GLSL the keyword belongs to.
60 Variant_GLSL_120 = 0x00010000, // 1.20 and higher
61 Variant_GLSL_150 = 0x00020000, // 1.50 and higher
62 Variant_GLSL_400 = 0x00040000, // 4.00 and higher
63 Variant_GLSL_ES_100 = 0x00080000, // ES 1.00 and higher
64 Variant_VertexShader = 0x00200000,
65 Variant_FragmentShader = 0x00400000,
66 Variant_Reserved = 0x80000000,
67 Variant_Mask = 0xFFFF0000,
68 Variant_All = 0xFFFF0000
69 };
70
71 union Value {
72 int i;
73 const QString *string;
74 void *ptr;
75 };
76
77 Engine *engine() const { return _engine; }
78
79 int state() const { return _state; }
80 void setState(int state) { _state = state; }
81
82 int variant() const { return _variant; }
83 void setVariant(int flags) { _variant = flags; }
84
85 bool scanKeywords() const { return _scanKeywords; }
86 void setScanKeywords(bool scanKeywords) { _scanKeywords = scanKeywords; }
87
88 bool scanComments() const { return _scanComments; }
89 void setScanComments(bool scanComments) { _scanComments = scanComments; }
90
91 int yylex(Token *tk);
92 int findKeyword(const char *word, int length) const;
93
94 void *yyval() const { return _yyval.ptr; }
95
96 static QStringList keywords(int variant);
97
98private:
99 static int classify(const char *s, int len);
100
101 void yyinp();
102 int yylex_helper(const char **position, int *line);
103
104 void warning(int line, const QString &message);
105 void error(int line, const QString &message);
106
107private:
108 Engine *_engine;
109 const char *_source;
110 const char *_it;
111 QT_WARNING_PUSH QT_WARNING_DISABLE_GCC("-Wattributes")
112 [[maybe_unused]] int _size;
113 QT_WARNING_POP
114 int _yychar;
115 int _lineno;
116 int _state;
117 int _variant;
118 unsigned _scanKeywords: 1;
119 unsigned _scanComments: 1;
120 Value _yyval;
121};
122
123} // namespace GLSL
124
125QT_END_NAMESPACE
126
127#endif // QSSG_GLSLLEXER_H
128

source code of qtquick3d/src/glslparser/glsllexer_p.h