1 /* 2 * Copyright 2016 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #ifndef SKSL_TOKEN 9 #define SKSL_TOKEN 10 11 #include "SkSLPosition.h" 12 #include "SkSLUtil.h" 13 14 namespace SkSL { 15 16 #undef IN 17 #undef OUT 18 #undef CONST 19 20 /** 21 * Represents a lexical analysis token. Token is generally only used during the parse process, but 22 * Token::Kind is also used to represent operator kinds. 23 */ 24 struct Token { 25 enum Kind { 26 END_OF_FILE, 27 IDENTIFIER, 28 INT_LITERAL, 29 FLOAT_LITERAL, 30 TRUE_LITERAL, 31 FALSE_LITERAL, 32 LPAREN, 33 RPAREN, 34 LBRACE, 35 RBRACE, 36 LBRACKET, 37 RBRACKET, 38 DOT, 39 COMMA, 40 PLUSPLUS, 41 MINUSMINUS, 42 PLUS, 43 MINUS, 44 STAR, 45 SLASH, 46 PERCENT, 47 SHL, 48 SHR, 49 BITWISEOR, 50 BITWISEXOR, 51 BITWISEAND, 52 BITWISENOT, 53 LOGICALOR, 54 LOGICALXOR, 55 LOGICALAND, 56 LOGICALNOT, 57 QUESTION, 58 COLON, 59 EQ, 60 EQEQ, 61 NEQ, 62 GT, 63 LT, 64 GTEQ, 65 LTEQ, 66 PLUSEQ, 67 MINUSEQ, 68 STAREQ, 69 SLASHEQ, 70 PERCENTEQ, 71 SHLEQ, 72 SHREQ, 73 BITWISEOREQ, 74 BITWISEXOREQ, 75 BITWISEANDEQ, 76 LOGICALOREQ, 77 LOGICALXOREQ, 78 LOGICALANDEQ, 79 SEMICOLON, 80 IF, 81 ELSE, 82 FOR, 83 WHILE, 84 DO, 85 SWITCH, 86 CASE, 87 DEFAULT, 88 RETURN, 89 BREAK, 90 CONTINUE, 91 DISCARD, 92 IN, 93 OUT, 94 INOUT, 95 CONST, 96 LOWP, 97 MEDIUMP, 98 HIGHP, 99 UNIFORM, 100 FLAT, 101 NOPERSPECTIVE, 102 READONLY, 103 WRITEONLY, 104 COHERENT, 105 VOLATILE, 106 RESTRICT, 107 STRUCT, 108 LAYOUT, 109 DIRECTIVE, 110 PRECISION, 111 LOCATION, 112 OFFSET, 113 BINDING, 114 INDEX, 115 SET, 116 BUILTIN, 117 INPUT_ATTACHMENT_INDEX, 118 ORIGIN_UPPER_LEFT, 119 OVERRIDE_COVERAGE, 120 BLEND_SUPPORT_ALL_EQUATIONS, 121 PUSH_CONSTANT, 122 POINTS, 123 LINES, 124 LINE_STRIP, 125 LINES_ADJACENCY, 126 TRIANGLES, 127 TRIANGLE_STRIP, 128 TRIANGLES_ADJACENCY, 129 MAX_VERTICES, 130 INVOCATIONS, 131 INVALID_TOKEN 132 }; 133 134 static SkString OperatorName(Kind kind) { 135 switch (kind) { 136 case Token::PLUS: return SkString("+"); 137 case Token::MINUS: return SkString("-"); 138 case Token::STAR: return SkString("*"); 139 case Token::SLASH: return SkString("/"); 140 case Token::PERCENT: return SkString("%"); 141 case Token::SHL: return SkString("<<"); 142 case Token::SHR: return SkString(">>"); 143 case Token::LOGICALNOT: return SkString("!"); 144 case Token::LOGICALAND: return SkString("&&"); 145 case Token::LOGICALOR: return SkString("||"); 146 case Token::LOGICALXOR: return SkString("^^"); 147 case Token::BITWISENOT: return SkString("~"); 148 case Token::BITWISEAND: return SkString("&"); 149 case Token::BITWISEOR: return SkString("|"); 150 case Token::BITWISEXOR: return SkString("^"); 151 case Token::EQ: return SkString("="); 152 case Token::EQEQ: return SkString("=="); 153 case Token::NEQ: return SkString("!="); 154 case Token::LT: return SkString("<"); 155 case Token::GT: return SkString(">"); 156 case Token::LTEQ: return SkString("<="); 157 case Token::GTEQ: return SkString(">="); 158 case Token::PLUSEQ: return SkString("+="); 159 case Token::MINUSEQ: return SkString("-="); 160 case Token::STAREQ: return SkString("*="); 161 case Token::SLASHEQ: return SkString("/="); 162 case Token::PERCENTEQ: return SkString("%="); 163 case Token::SHLEQ: return SkString("<<="); 164 case Token::SHREQ: return SkString(">>="); 165 case Token::LOGICALANDEQ: return SkString("&&="); 166 case Token::LOGICALOREQ: return SkString("||="); 167 case Token::LOGICALXOREQ: return SkString("^^="); 168 case Token::BITWISEANDEQ: return SkString("&="); 169 case Token::BITWISEOREQ: return SkString("|="); 170 case Token::BITWISEXOREQ: return SkString("^="); 171 case Token::PLUSPLUS: return SkString("++"); 172 case Token::MINUSMINUS: return SkString("--"); 173 default: 174 ABORT("unsupported operator: %d\n", kind); 175 } 176 } 177 178 Token() { 179 } 180 181 Token(Position position, Kind kind, SkString text) 182 : fPosition(position) 183 , fKind(kind) 184 , fText(std::move(text)) {} 185 186 static bool IsAssignment(Token::Kind op) { 187 switch (op) { 188 case Token::EQ: // fall through 189 case Token::PLUSEQ: // fall through 190 case Token::MINUSEQ: // fall through 191 case Token::STAREQ: // fall through 192 case Token::SLASHEQ: // fall through 193 case Token::PERCENTEQ: // fall through 194 case Token::SHLEQ: // fall through 195 case Token::SHREQ: // fall through 196 case Token::BITWISEOREQ: // fall through 197 case Token::BITWISEXOREQ: // fall through 198 case Token::BITWISEANDEQ: // fall through 199 case Token::LOGICALOREQ: // fall through 200 case Token::LOGICALXOREQ: // fall through 201 case Token::LOGICALANDEQ: 202 return true; 203 default: 204 return false; 205 } 206 } 207 208 Position fPosition; 209 Kind fKind; 210 // will be the empty string unless the token has variable text content (identifiers, numeric 211 // literals, and directives) 212 SkString fText; 213 }; 214 215 } // namespace 216 #endif 217
