Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2021 Google LLC. |
| 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 | #include "src/sksl/SkSLDSLParser.h" |
| 9 | |
| 10 | #include "include/private/SkSLString.h" |
| 11 | #include "src/sksl/SkSLCompiler.h" |
| 12 | |
| 13 | #include <memory> |
| 14 | |
| 15 | #if SKSL_DSL_PARSER |
| 16 | |
| 17 | using namespace SkSL::dsl; |
| 18 | |
| 19 | namespace SkSL { |
| 20 | |
| 21 | static constexpr int kMaxParseDepth = 50; |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 22 | |
| 23 | static int parse_modifier_token(Token::Kind token) { |
| 24 | switch (token) { |
| 25 | case Token::Kind::TK_UNIFORM: return Modifiers::kUniform_Flag; |
| 26 | case Token::Kind::TK_CONST: return Modifiers::kConst_Flag; |
| 27 | case Token::Kind::TK_IN: return Modifiers::kIn_Flag; |
| 28 | case Token::Kind::TK_OUT: return Modifiers::kOut_Flag; |
| 29 | case Token::Kind::TK_INOUT: return Modifiers::kIn_Flag | Modifiers::kOut_Flag; |
| 30 | case Token::Kind::TK_FLAT: return Modifiers::kFlat_Flag; |
| 31 | case Token::Kind::TK_NOPERSPECTIVE: return Modifiers::kNoPerspective_Flag; |
| 32 | case Token::Kind::TK_HASSIDEEFFECTS: return Modifiers::kHasSideEffects_Flag; |
| 33 | case Token::Kind::TK_INLINE: return Modifiers::kInline_Flag; |
| 34 | case Token::Kind::TK_NOINLINE: return Modifiers::kNoInline_Flag; |
John Stiles | 0201431 | 2021-08-04 16:03:12 -0400 | [diff] [blame] | 35 | case Token::Kind::TK_HIGHP: return Modifiers::kHighp_Flag; |
| 36 | case Token::Kind::TK_MEDIUMP: return Modifiers::kMediump_Flag; |
| 37 | case Token::Kind::TK_LOWP: return Modifiers::kLowp_Flag; |
John Stiles | efde90d | 2021-08-12 23:06:24 -0400 | [diff] [blame] | 38 | case Token::Kind::TK_ES3: return Modifiers::kES3_Flag; |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 39 | default: return 0; |
| 40 | } |
| 41 | } |
| 42 | |
| 43 | class AutoDSLDepth { |
| 44 | public: |
| 45 | AutoDSLDepth(DSLParser* p) |
| 46 | : fParser(p) |
| 47 | , fDepth(0) {} |
| 48 | |
| 49 | ~AutoDSLDepth() { |
| 50 | fParser->fDepth -= fDepth; |
| 51 | } |
| 52 | |
| 53 | bool increase() { |
| 54 | ++fDepth; |
| 55 | ++fParser->fDepth; |
| 56 | if (fParser->fDepth > kMaxParseDepth) { |
| 57 | fParser->error(fParser->peek(), String("exceeded max parse depth")); |
| 58 | return false; |
| 59 | } |
| 60 | return true; |
| 61 | } |
| 62 | |
| 63 | private: |
| 64 | DSLParser* fParser; |
| 65 | int fDepth; |
| 66 | }; |
| 67 | |
| 68 | class AutoDSLSymbolTable { |
| 69 | public: |
| 70 | AutoDSLSymbolTable() { |
| 71 | dsl::PushSymbolTable(); |
| 72 | } |
| 73 | |
| 74 | ~AutoDSLSymbolTable() { |
| 75 | dsl::PopSymbolTable(); |
| 76 | } |
| 77 | }; |
| 78 | |
| 79 | std::unordered_map<skstd::string_view, DSLParser::LayoutToken>* DSLParser::layoutTokens; |
| 80 | |
| 81 | void DSLParser::InitLayoutMap() { |
| 82 | layoutTokens = new std::unordered_map<skstd::string_view, LayoutToken>; |
| 83 | #define TOKEN(name, text) (*layoutTokens)[text] = LayoutToken::name |
| 84 | TOKEN(LOCATION, "location"); |
| 85 | TOKEN(OFFSET, "offset"); |
| 86 | TOKEN(BINDING, "binding"); |
| 87 | TOKEN(INDEX, "index"); |
| 88 | TOKEN(SET, "set"); |
| 89 | TOKEN(BUILTIN, "builtin"); |
| 90 | TOKEN(INPUT_ATTACHMENT_INDEX, "input_attachment_index"); |
| 91 | TOKEN(ORIGIN_UPPER_LEFT, "origin_upper_left"); |
| 92 | TOKEN(BLEND_SUPPORT_ALL_EQUATIONS, "blend_support_all_equations"); |
| 93 | TOKEN(PUSH_CONSTANT, "push_constant"); |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 94 | TOKEN(SRGB_UNPREMUL, "srgb_unpremul"); |
| 95 | #undef TOKEN |
| 96 | } |
| 97 | |
| 98 | DSLParser::DSLParser(Compiler* compiler, const ProgramSettings& settings, ProgramKind kind, |
| 99 | String text) |
| 100 | : fCompiler(*compiler) |
| 101 | , fSettings(settings) |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 102 | , fKind(kind) |
Ethan Nicholas | 6f20b8d | 2021-08-31 07:40:24 -0400 | [diff] [blame] | 103 | , fText(std::make_unique<String>(std::move(text))) |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 104 | , fPushback(Token::Kind::TK_NONE, -1, -1) { |
| 105 | // We don't want to have to worry about manually releasing all of the objects in the event that |
| 106 | // an error occurs |
| 107 | fSettings.fAssertDSLObjectsReleased = false; |
Ethan Nicholas | 6f20b8d | 2021-08-31 07:40:24 -0400 | [diff] [blame] | 108 | fLexer.start(*fText); |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 109 | static const bool layoutMapInitialized = []{ InitLayoutMap(); return true; }(); |
| 110 | (void) layoutMapInitialized; |
| 111 | } |
| 112 | |
| 113 | Token DSLParser::nextRawToken() { |
| 114 | if (fPushback.fKind != Token::Kind::TK_NONE) { |
| 115 | Token result = fPushback; |
| 116 | fPushback.fKind = Token::Kind::TK_NONE; |
| 117 | return result; |
| 118 | } |
| 119 | return fLexer.next(); |
| 120 | } |
| 121 | |
| 122 | Token DSLParser::nextToken() { |
| 123 | Token token = this->nextRawToken(); |
| 124 | while (token.fKind == Token::Kind::TK_WHITESPACE || |
| 125 | token.fKind == Token::Kind::TK_LINE_COMMENT || |
| 126 | token.fKind == Token::Kind::TK_BLOCK_COMMENT) { |
| 127 | token = this->nextRawToken(); |
| 128 | } |
| 129 | return token; |
| 130 | } |
| 131 | |
| 132 | void DSLParser::pushback(Token t) { |
| 133 | SkASSERT(fPushback.fKind == Token::Kind::TK_NONE); |
| 134 | fPushback = std::move(t); |
| 135 | } |
| 136 | |
| 137 | Token DSLParser::peek() { |
| 138 | if (fPushback.fKind == Token::Kind::TK_NONE) { |
| 139 | fPushback = this->nextToken(); |
| 140 | } |
| 141 | return fPushback; |
| 142 | } |
| 143 | |
| 144 | bool DSLParser::checkNext(Token::Kind kind, Token* result) { |
| 145 | if (fPushback.fKind != Token::Kind::TK_NONE && fPushback.fKind != kind) { |
| 146 | return false; |
| 147 | } |
| 148 | Token next = this->nextToken(); |
| 149 | if (next.fKind == kind) { |
| 150 | if (result) { |
| 151 | *result = next; |
| 152 | } |
| 153 | return true; |
| 154 | } |
| 155 | this->pushback(std::move(next)); |
| 156 | return false; |
| 157 | } |
| 158 | |
| 159 | bool DSLParser::expect(Token::Kind kind, const char* expected, Token* result) { |
| 160 | Token next = this->nextToken(); |
| 161 | if (next.fKind == kind) { |
| 162 | if (result) { |
| 163 | *result = std::move(next); |
| 164 | } |
| 165 | return true; |
| 166 | } else { |
| 167 | this->error(next, "expected " + String(expected) + ", but found '" + |
| 168 | this->text(next) + "'"); |
Ethan Nicholas | 5d97a96 | 2021-08-30 15:58:52 -0400 | [diff] [blame] | 169 | this->fEncounteredFatalError = true; |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 170 | return false; |
| 171 | } |
| 172 | } |
| 173 | |
| 174 | bool DSLParser::expectIdentifier(Token* result) { |
| 175 | if (!this->expect(Token::Kind::TK_IDENTIFIER, "an identifier", result)) { |
| 176 | return false; |
| 177 | } |
| 178 | if (IsType(this->text(*result))) { |
| 179 | this->error(*result, "expected an identifier, but found type '" + |
| 180 | this->text(*result) + "'"); |
Ethan Nicholas | 5d97a96 | 2021-08-30 15:58:52 -0400 | [diff] [blame] | 181 | this->fEncounteredFatalError = true; |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 182 | return false; |
| 183 | } |
| 184 | return true; |
| 185 | } |
| 186 | |
| 187 | skstd::string_view DSLParser::text(Token token) { |
Ethan Nicholas | 6f20b8d | 2021-08-31 07:40:24 -0400 | [diff] [blame] | 188 | return skstd::string_view(fText->data() + token.fOffset, token.fLength); |
| 189 | } |
| 190 | |
| 191 | PositionInfo DSLParser::position(Token t) { |
| 192 | return this->position(t.fOffset); |
| 193 | } |
| 194 | |
| 195 | PositionInfo DSLParser::position(int offset) { |
| 196 | return PositionInfo::Offset("<unknown>", fText->c_str(), offset); |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 197 | } |
| 198 | |
| 199 | void DSLParser::error(Token token, String msg) { |
| 200 | this->error(token.fOffset, msg); |
| 201 | } |
| 202 | |
| 203 | void DSLParser::error(int offset, String msg) { |
Ethan Nicholas | 6f20b8d | 2021-08-31 07:40:24 -0400 | [diff] [blame] | 204 | GetErrorReporter().error(msg.c_str(), this->position(offset)); |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 205 | } |
| 206 | |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 207 | /* declaration* END_OF_FILE */ |
| 208 | std::unique_ptr<Program> DSLParser::program() { |
Ethan Nicholas | 5c4463e | 2021-08-29 14:31:19 -0400 | [diff] [blame] | 209 | ErrorReporter* errorReporter = &fCompiler.errorReporter(); |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 210 | Start(&fCompiler, fKind, fSettings); |
Ethan Nicholas | 5c4463e | 2021-08-29 14:31:19 -0400 | [diff] [blame] | 211 | SetErrorReporter(errorReporter); |
Ethan Nicholas | 6f20b8d | 2021-08-31 07:40:24 -0400 | [diff] [blame] | 212 | errorReporter->setSource(fText->c_str()); |
Ethan Nicholas | 5d97a96 | 2021-08-30 15:58:52 -0400 | [diff] [blame] | 213 | fEncounteredFatalError = false; |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 214 | std::unique_ptr<Program> result; |
| 215 | bool done = false; |
| 216 | while (!done) { |
| 217 | switch (this->peek().fKind) { |
| 218 | case Token::Kind::TK_END_OF_FILE: |
| 219 | done = true; |
Ethan Nicholas | 5c4463e | 2021-08-29 14:31:19 -0400 | [diff] [blame] | 220 | if (!errorReporter->errorCount()) { |
Ethan Nicholas | 6f20b8d | 2021-08-31 07:40:24 -0400 | [diff] [blame] | 221 | result = dsl::ReleaseProgram(std::move(fText)); |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 222 | } |
| 223 | break; |
| 224 | case Token::Kind::TK_INVALID: { |
Ethan Nicholas | 6f20b8d | 2021-08-31 07:40:24 -0400 | [diff] [blame] | 225 | this->nextToken(); |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 226 | this->error(this->peek(), String("invalid token")); |
Ethan Nicholas | f8f1fa0 | 2021-08-29 14:12:17 -0400 | [diff] [blame] | 227 | done = true; |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 228 | break; |
| 229 | } |
Ethan Nicholas | 5d97a96 | 2021-08-30 15:58:52 -0400 | [diff] [blame] | 230 | default: |
| 231 | this->declaration(); |
| 232 | done = fEncounteredFatalError; |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 233 | } |
| 234 | } |
| 235 | End(); |
Ethan Nicholas | 6f20b8d | 2021-08-31 07:40:24 -0400 | [diff] [blame] | 236 | errorReporter->setSource(nullptr); |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 237 | return result; |
| 238 | } |
| 239 | |
| 240 | /* modifiers (structVarDeclaration | type IDENTIFIER ((LPAREN parameter (COMMA parameter)* RPAREN |
| 241 | (block | SEMICOLON)) | SEMICOLON) | interfaceBlock) */ |
| 242 | bool DSLParser::declaration() { |
| 243 | Token lookahead = this->peek(); |
| 244 | switch (lookahead.fKind) { |
| 245 | case Token::Kind::TK_SEMICOLON: |
Ethan Nicholas | 6f20b8d | 2021-08-31 07:40:24 -0400 | [diff] [blame] | 246 | this->nextToken(); |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 247 | this->error(lookahead.fOffset, "expected a declaration, but found ';'"); |
| 248 | return false; |
| 249 | default: |
| 250 | break; |
| 251 | } |
| 252 | DSLModifiers modifiers = this->modifiers(); |
| 253 | lookahead = this->peek(); |
| 254 | if (lookahead.fKind == Token::Kind::TK_IDENTIFIER && !IsType(this->text(lookahead))) { |
| 255 | // we have an identifier that's not a type, could be the start of an interface block |
| 256 | return this->interfaceBlock(modifiers); |
| 257 | } |
| 258 | if (lookahead.fKind == Token::Kind::TK_SEMICOLON) { |
| 259 | this->error(lookahead, "modifiers declarations are not yet supported"); |
| 260 | } |
| 261 | if (lookahead.fKind == Token::Kind::TK_STRUCT) { |
| 262 | SkTArray<DSLGlobalVar> result = this->structVarDeclaration(modifiers); |
| 263 | Declare(result); |
| 264 | return true; |
| 265 | } |
John Stiles | 4adb66f | 2021-08-05 10:15:16 -0400 | [diff] [blame] | 266 | skstd::optional<DSLType> type = this->type(modifiers); |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 267 | if (!type) { |
| 268 | return false; |
| 269 | } |
| 270 | Token name; |
| 271 | if (!this->expectIdentifier(&name)) { |
| 272 | return false; |
| 273 | } |
| 274 | if (this->checkNext(Token::Kind::TK_LPAREN)) { |
| 275 | return this->functionDeclarationEnd(modifiers, *type, name); |
| 276 | } else { |
Ethan Nicholas | 6f20b8d | 2021-08-31 07:40:24 -0400 | [diff] [blame] | 277 | SkTArray<DSLGlobalVar> result = this->varDeclarationEnd<DSLGlobalVar>(this->position(name), |
| 278 | modifiers, *type, |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 279 | this->text(name)); |
| 280 | Declare(result); |
| 281 | return true; |
| 282 | } |
| 283 | } |
| 284 | |
| 285 | /* (RPAREN | VOID RPAREN | parameter (COMMA parameter)* RPAREN) (block | SEMICOLON) */ |
John Stiles | e53c721 | 2021-08-05 10:19:11 -0400 | [diff] [blame] | 286 | bool DSLParser::functionDeclarationEnd(const DSLModifiers& modifiers, |
| 287 | DSLType type, |
| 288 | const Token& name) { |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 289 | SkTArray<DSLWrapper<DSLParameter>> parameters; |
| 290 | Token lookahead = this->peek(); |
| 291 | if (lookahead.fKind == Token::Kind::TK_RPAREN) { |
| 292 | // `()` means no parameters at all. |
| 293 | } else if (lookahead.fKind == Token::Kind::TK_IDENTIFIER && this->text(lookahead) == "void") { |
| 294 | // `(void)` also means no parameters at all. |
| 295 | this->nextToken(); |
| 296 | } else { |
| 297 | for (;;) { |
| 298 | skstd::optional<DSLWrapper<DSLParameter>> parameter = this->parameter(); |
| 299 | if (!parameter) { |
| 300 | return false; |
| 301 | } |
| 302 | parameters.push_back(std::move(*parameter)); |
| 303 | if (!this->checkNext(Token::Kind::TK_COMMA)) { |
| 304 | break; |
| 305 | } |
| 306 | } |
| 307 | } |
| 308 | if (!this->expect(Token::Kind::TK_RPAREN, "')'")) { |
| 309 | return false; |
| 310 | } |
| 311 | SkTArray<DSLParameter*> parameterPointers; |
| 312 | for (DSLWrapper<DSLParameter>& param : parameters) { |
| 313 | parameterPointers.push_back(¶m.get()); |
| 314 | } |
Ethan Nicholas | 6f20b8d | 2021-08-31 07:40:24 -0400 | [diff] [blame] | 315 | DSLFunction result(modifiers, type, this->text(name), parameterPointers, this->position(name)); |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 316 | if (!this->checkNext(Token::Kind::TK_SEMICOLON)) { |
| 317 | AutoDSLSymbolTable symbols; |
| 318 | for (DSLParameter* var : parameterPointers) { |
| 319 | AddToSymbolTable(*var); |
| 320 | } |
| 321 | skstd::optional<DSLBlock> body = this->block(); |
| 322 | if (!body) { |
| 323 | return false; |
| 324 | } |
| 325 | result.define(std::move(*body)); |
| 326 | } |
| 327 | return true; |
| 328 | } |
| 329 | |
| 330 | static skstd::optional<DSLStatement> declaration_statements(SkTArray<DSLVar> vars, |
| 331 | SymbolTable& symbols) { |
| 332 | if (vars.empty()) { |
| 333 | return skstd::nullopt; |
| 334 | } |
| 335 | return Declare(vars); |
| 336 | } |
| 337 | |
Ethan Nicholas | 51b4b86 | 2021-08-31 16:12:40 -0400 | [diff] [blame] | 338 | static bool is_valid(const skstd::optional<DSLWrapper<DSLExpression>>& expr) { |
| 339 | return expr && expr->get().isValid(); |
| 340 | } |
| 341 | |
Ethan Nicholas | 6f20b8d | 2021-08-31 07:40:24 -0400 | [diff] [blame] | 342 | SKSL_INT DSLParser::arraySize() { |
| 343 | Token next = this->peek(); |
| 344 | if (next.fKind == Token::Kind::TK_INT_LITERAL) { |
| 345 | SKSL_INT size; |
| 346 | if (this->intLiteral(&size)) { |
| 347 | if (size > INT32_MAX) { |
| 348 | this->error(next, "array size out of bounds"); |
| 349 | return 1; |
| 350 | } |
| 351 | if (size <= 0) { |
| 352 | this->error(next, "array size must be positive"); |
| 353 | return 1; |
| 354 | } |
| 355 | return size; |
| 356 | } |
| 357 | return 1; |
| 358 | } else if (this->checkNext(Token::Kind::TK_MINUS) && |
| 359 | this->checkNext(Token::Kind::TK_INT_LITERAL)) { |
| 360 | this->error(next, "array size must be positive"); |
| 361 | return 1; |
| 362 | } else { |
Ethan Nicholas | 51b4b86 | 2021-08-31 16:12:40 -0400 | [diff] [blame] | 363 | skstd::optional<DSLWrapper<DSLExpression>> expr = this->expression(); |
| 364 | if (is_valid(expr)) { |
| 365 | this->error(next, "expected int literal"); |
| 366 | } |
Ethan Nicholas | 6f20b8d | 2021-08-31 07:40:24 -0400 | [diff] [blame] | 367 | return 1; |
| 368 | } |
| 369 | } |
| 370 | |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 371 | template<class T> |
Ethan Nicholas | 6f20b8d | 2021-08-31 07:40:24 -0400 | [diff] [blame] | 372 | SkTArray<T> DSLParser::varDeclarationEnd(PositionInfo pos, const dsl::DSLModifiers& mods, |
| 373 | dsl::DSLType baseType, skstd::string_view name) { |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 374 | using namespace dsl; |
| 375 | SkTArray<T> result; |
| 376 | int offset = this->peek().fOffset; |
| 377 | auto parseArrayDimensions = [&](DSLType* type) -> bool { |
| 378 | while (this->checkNext(Token::Kind::TK_LBRACKET)) { |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 379 | if (this->checkNext(Token::Kind::TK_RBRACKET)) { |
| 380 | this->error(offset, "expected array dimension"); |
| 381 | } else { |
Ethan Nicholas | 6f20b8d | 2021-08-31 07:40:24 -0400 | [diff] [blame] | 382 | *type = Array(*type, this->arraySize(), pos); |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 383 | if (!this->expect(Token::Kind::TK_RBRACKET, "']'")) { |
| 384 | return {}; |
| 385 | } |
| 386 | } |
| 387 | } |
| 388 | return true; |
| 389 | }; |
| 390 | auto parseInitializer = [this](DSLExpression* initializer) -> bool { |
| 391 | if (this->checkNext(Token::Kind::TK_EQ)) { |
| 392 | skstd::optional<DSLWrapper<DSLExpression>> value = this->assignmentExpression(); |
| 393 | if (!value) { |
| 394 | return false; |
| 395 | } |
| 396 | initializer->swap(**value); |
| 397 | } |
| 398 | return true; |
| 399 | }; |
| 400 | |
| 401 | DSLType type = baseType; |
| 402 | DSLExpression initializer; |
| 403 | if (!parseArrayDimensions(&type)) { |
| 404 | return {}; |
| 405 | } |
Ethan Nicholas | 6f20b8d | 2021-08-31 07:40:24 -0400 | [diff] [blame] | 406 | parseInitializer(&initializer); |
| 407 | result.push_back(T(mods, type, name, std::move(initializer), pos)); |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 408 | AddToSymbolTable(result.back()); |
| 409 | |
| 410 | while (this->checkNext(Token::Kind::TK_COMMA)) { |
| 411 | type = baseType; |
| 412 | Token identifierName; |
| 413 | if (!this->expectIdentifier(&identifierName)) { |
Ethan Nicholas | b9c6489 | 2021-09-02 10:31:25 -0400 | [diff] [blame] | 414 | return result; |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 415 | } |
| 416 | if (!parseArrayDimensions(&type)) { |
Ethan Nicholas | b9c6489 | 2021-09-02 10:31:25 -0400 | [diff] [blame] | 417 | return result; |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 418 | } |
| 419 | if (!parseInitializer(&initializer)) { |
Ethan Nicholas | b9c6489 | 2021-09-02 10:31:25 -0400 | [diff] [blame] | 420 | return result; |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 421 | } |
| 422 | result.push_back(T(mods, type, this->text(identifierName), std::move(initializer))); |
| 423 | AddToSymbolTable(result.back()); |
| 424 | } |
Ethan Nicholas | b9c6489 | 2021-09-02 10:31:25 -0400 | [diff] [blame] | 425 | this->expect(Token::Kind::TK_SEMICOLON, "';'"); |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 426 | return result; |
| 427 | } |
| 428 | |
| 429 | /* (varDeclarations | expressionStatement) */ |
| 430 | skstd::optional<DSLStatement> DSLParser::varDeclarationsOrExpressionStatement() { |
| 431 | Token nextToken = this->peek(); |
| 432 | if (nextToken.fKind == Token::Kind::TK_CONST) { |
| 433 | // Statements that begin with `const` might be variable declarations, but can't be legal |
| 434 | // SkSL expression-statements. (SkSL constructors don't take a `const` modifier.) |
| 435 | return this->varDeclarations(); |
| 436 | } |
| 437 | |
John Stiles | 0201431 | 2021-08-04 16:03:12 -0400 | [diff] [blame] | 438 | if (nextToken.fKind == Token::Kind::TK_HIGHP || |
| 439 | nextToken.fKind == Token::Kind::TK_MEDIUMP || |
| 440 | nextToken.fKind == Token::Kind::TK_LOWP || |
| 441 | IsType(this->text(nextToken))) { |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 442 | // Statements that begin with a typename are most often variable declarations, but |
| 443 | // occasionally the type is part of a constructor, and these are actually expression- |
| 444 | // statements in disguise. First, attempt the common case: parse it as a vardecl. |
| 445 | Checkpoint checkpoint(this); |
| 446 | VarDeclarationsPrefix prefix; |
| 447 | if (this->varDeclarationsPrefix(&prefix)) { |
| 448 | checkpoint.accept(); |
Ethan Nicholas | 6f20b8d | 2021-08-31 07:40:24 -0400 | [diff] [blame] | 449 | return declaration_statements(this->varDeclarationEnd<DSLVar>(prefix.fPosition, |
| 450 | prefix.fModifiers, |
| 451 | prefix.fType, |
| 452 | this->text(prefix.fName)), |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 453 | this->symbols()); |
| 454 | } |
| 455 | |
| 456 | // If this statement wasn't actually a vardecl after all, rewind and try parsing it as an |
| 457 | // expression-statement instead. |
| 458 | checkpoint.rewind(); |
| 459 | } |
| 460 | return this->expressionStatement(); |
| 461 | } |
| 462 | |
| 463 | // Helper function for varDeclarations(). If this function succeeds, we assume that the rest of the |
| 464 | // statement is a variable-declaration statement, not an expression-statement. |
| 465 | bool DSLParser::varDeclarationsPrefix(VarDeclarationsPrefix* prefixData) { |
Ethan Nicholas | 6f20b8d | 2021-08-31 07:40:24 -0400 | [diff] [blame] | 466 | prefixData->fPosition = this->position(this->peek()); |
| 467 | prefixData->fModifiers = this->modifiers(); |
| 468 | skstd::optional<DSLType> type = this->type(prefixData->fModifiers); |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 469 | if (!type) { |
| 470 | return false; |
| 471 | } |
Ethan Nicholas | 6f20b8d | 2021-08-31 07:40:24 -0400 | [diff] [blame] | 472 | prefixData->fType = *type; |
| 473 | return this->expectIdentifier(&prefixData->fName); |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 474 | } |
| 475 | |
| 476 | /* modifiers type IDENTIFIER varDeclarationEnd */ |
| 477 | skstd::optional<DSLStatement> DSLParser::varDeclarations() { |
| 478 | VarDeclarationsPrefix prefix; |
| 479 | if (!this->varDeclarationsPrefix(&prefix)) { |
| 480 | return skstd::nullopt; |
| 481 | } |
Ethan Nicholas | 6f20b8d | 2021-08-31 07:40:24 -0400 | [diff] [blame] | 482 | return declaration_statements(this->varDeclarationEnd<DSLVar>(prefix.fPosition, |
| 483 | prefix.fModifiers, |
| 484 | prefix.fType, |
| 485 | this->text(prefix.fName)), |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 486 | this->symbols()); |
| 487 | } |
| 488 | |
| 489 | /* STRUCT IDENTIFIER LBRACE varDeclaration* RBRACE */ |
| 490 | skstd::optional<DSLType> DSLParser::structDeclaration() { |
| 491 | AutoDSLDepth depth(this); |
| 492 | if (!depth.increase()) { |
| 493 | return skstd::nullopt; |
| 494 | } |
| 495 | if (!this->expect(Token::Kind::TK_STRUCT, "'struct'")) { |
| 496 | return skstd::nullopt; |
| 497 | } |
| 498 | Token name; |
| 499 | if (!this->expectIdentifier(&name)) { |
| 500 | return skstd::nullopt; |
| 501 | } |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 502 | if (!this->expect(Token::Kind::TK_LBRACE, "'{'")) { |
| 503 | return skstd::nullopt; |
| 504 | } |
| 505 | SkTArray<DSLField> fields; |
| 506 | while (!this->checkNext(Token::Kind::TK_RBRACE)) { |
| 507 | DSLModifiers modifiers = this->modifiers(); |
| 508 | |
John Stiles | 4adb66f | 2021-08-05 10:15:16 -0400 | [diff] [blame] | 509 | skstd::optional<DSLType> type = this->type(modifiers); |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 510 | if (!type) { |
| 511 | return skstd::nullopt; |
| 512 | } |
| 513 | |
| 514 | do { |
| 515 | DSLType actualType = *type; |
| 516 | Token memberName; |
| 517 | if (!this->expectIdentifier(&memberName)) { |
| 518 | return skstd::nullopt; |
| 519 | } |
| 520 | |
Ethan Nicholas | 6f20b8d | 2021-08-31 07:40:24 -0400 | [diff] [blame] | 521 | while (this->checkNext(Token::Kind::TK_LBRACKET)) { |
| 522 | actualType = dsl::Array(actualType, this->arraySize(), this->position(memberName)); |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 523 | if (!this->expect(Token::Kind::TK_RBRACKET, "']'")) { |
| 524 | return skstd::nullopt; |
| 525 | } |
| 526 | } |
Ethan Nicholas | 0c8a598 | 2021-08-31 11:48:54 -0400 | [diff] [blame] | 527 | fields.push_back(DSLField(modifiers, std::move(actualType), this->text(memberName), |
| 528 | this->position(memberName))); |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 529 | } while (this->checkNext(Token::Kind::TK_COMMA)); |
| 530 | if (!this->expect(Token::Kind::TK_SEMICOLON, "';'")) { |
| 531 | return skstd::nullopt; |
| 532 | } |
| 533 | } |
| 534 | if (fields.empty()) { |
| 535 | this->error(name.fOffset, |
| 536 | "struct '" + this->text(name) + "' must contain at least one field"); |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 537 | } |
Ethan Nicholas | 6f20b8d | 2021-08-31 07:40:24 -0400 | [diff] [blame] | 538 | return dsl::Struct(this->text(name), SkMakeSpan(fields), this->position(name)); |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 539 | } |
| 540 | |
| 541 | /* structDeclaration ((IDENTIFIER varDeclarationEnd) | SEMICOLON) */ |
John Stiles | e53c721 | 2021-08-05 10:19:11 -0400 | [diff] [blame] | 542 | SkTArray<dsl::DSLGlobalVar> DSLParser::structVarDeclaration(const DSLModifiers& modifiers) { |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 543 | skstd::optional<DSLType> type = this->structDeclaration(); |
| 544 | if (!type) { |
| 545 | return {}; |
| 546 | } |
| 547 | Token name; |
| 548 | if (this->checkNext(Token::Kind::TK_IDENTIFIER, &name)) { |
Ethan Nicholas | 38ccf67 | 2021-09-02 10:38:22 -0400 | [diff] [blame] | 549 | return this->varDeclarationEnd<DSLGlobalVar>(this->position(name), modifiers, |
| 550 | std::move(*type), this->text(name)); |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 551 | } |
| 552 | this->expect(Token::Kind::TK_SEMICOLON, "';'"); |
| 553 | return {}; |
| 554 | } |
| 555 | |
| 556 | /* modifiers type IDENTIFIER (LBRACKET INT_LITERAL RBRACKET)? */ |
| 557 | skstd::optional<DSLWrapper<DSLParameter>> DSLParser::parameter() { |
| 558 | DSLModifiers modifiers = this->modifiersWithDefaults(0); |
John Stiles | 4adb66f | 2021-08-05 10:15:16 -0400 | [diff] [blame] | 559 | skstd::optional<DSLType> type = this->type(modifiers); |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 560 | if (!type) { |
| 561 | return skstd::nullopt; |
| 562 | } |
| 563 | Token name; |
| 564 | if (!this->expectIdentifier(&name)) { |
| 565 | return skstd::nullopt; |
| 566 | } |
| 567 | while (this->checkNext(Token::Kind::TK_LBRACKET)) { |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 568 | Token sizeToken; |
| 569 | if (!this->expect(Token::Kind::TK_INT_LITERAL, "a positive integer", &sizeToken)) { |
| 570 | return skstd::nullopt; |
| 571 | } |
| 572 | skstd::string_view arraySizeFrag = this->text(sizeToken); |
| 573 | SKSL_INT arraySize; |
| 574 | if (!SkSL::stoi(arraySizeFrag, &arraySize)) { |
| 575 | this->error(sizeToken, "array size is too large: " + arraySizeFrag); |
Ethan Nicholas | 709ecd5 | 2021-09-01 15:48:42 -0400 | [diff] [blame] | 576 | arraySize = 1; |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 577 | } |
Ethan Nicholas | 6f20b8d | 2021-08-31 07:40:24 -0400 | [diff] [blame] | 578 | type = Array(*type, arraySize, this->position(name)); |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 579 | if (!this->expect(Token::Kind::TK_RBRACKET, "']'")) { |
| 580 | return skstd::nullopt; |
| 581 | } |
| 582 | } |
Ethan Nicholas | 6f20b8d | 2021-08-31 07:40:24 -0400 | [diff] [blame] | 583 | return {{DSLParameter(modifiers, *type, this->text(name), this->position(name))}}; |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 584 | } |
| 585 | |
| 586 | /** EQ INT_LITERAL */ |
| 587 | int DSLParser::layoutInt() { |
| 588 | if (!this->expect(Token::Kind::TK_EQ, "'='")) { |
| 589 | return -1; |
| 590 | } |
| 591 | Token resultToken; |
| 592 | if (!this->expect(Token::Kind::TK_INT_LITERAL, "a non-negative integer", &resultToken)) { |
| 593 | return -1; |
| 594 | } |
| 595 | skstd::string_view resultFrag = this->text(resultToken); |
| 596 | SKSL_INT resultValue; |
| 597 | if (!SkSL::stoi(resultFrag, &resultValue)) { |
| 598 | this->error(resultToken, "value in layout is too large: " + resultFrag); |
| 599 | return -1; |
| 600 | } |
| 601 | return resultValue; |
| 602 | } |
| 603 | |
| 604 | /** EQ IDENTIFIER */ |
| 605 | skstd::string_view DSLParser::layoutIdentifier() { |
| 606 | if (!this->expect(Token::Kind::TK_EQ, "'='")) { |
| 607 | return {}; |
| 608 | } |
| 609 | Token resultToken; |
| 610 | if (!this->expectIdentifier(&resultToken)) { |
| 611 | return {}; |
| 612 | } |
| 613 | return this->text(resultToken); |
| 614 | } |
| 615 | |
| 616 | /* LAYOUT LPAREN IDENTIFIER (EQ INT_LITERAL)? (COMMA IDENTIFIER (EQ INT_LITERAL)?)* RPAREN */ |
| 617 | DSLLayout DSLParser::layout() { |
| 618 | DSLLayout result; |
| 619 | if (this->checkNext(Token::Kind::TK_LAYOUT)) { |
| 620 | if (!this->expect(Token::Kind::TK_LPAREN, "'('")) { |
| 621 | return result; |
| 622 | } |
| 623 | for (;;) { |
| 624 | Token t = this->nextToken(); |
| 625 | String text(this->text(t)); |
| 626 | auto found = layoutTokens->find(text); |
| 627 | if (found != layoutTokens->end()) { |
| 628 | switch (found->second) { |
| 629 | case LayoutToken::ORIGIN_UPPER_LEFT: |
Ethan Nicholas | df803aa | 2021-08-29 14:22:45 -0400 | [diff] [blame] | 630 | result.originUpperLeft(this->position(t)); |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 631 | break; |
| 632 | case LayoutToken::PUSH_CONSTANT: |
Ethan Nicholas | df803aa | 2021-08-29 14:22:45 -0400 | [diff] [blame] | 633 | result.pushConstant(this->position(t)); |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 634 | break; |
| 635 | case LayoutToken::BLEND_SUPPORT_ALL_EQUATIONS: |
Ethan Nicholas | df803aa | 2021-08-29 14:22:45 -0400 | [diff] [blame] | 636 | result.blendSupportAllEquations(this->position(t)); |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 637 | break; |
| 638 | case LayoutToken::SRGB_UNPREMUL: |
Ethan Nicholas | df803aa | 2021-08-29 14:22:45 -0400 | [diff] [blame] | 639 | result.srgbUnpremul(this->position(t)); |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 640 | break; |
| 641 | case LayoutToken::LOCATION: |
Ethan Nicholas | df803aa | 2021-08-29 14:22:45 -0400 | [diff] [blame] | 642 | result.location(this->layoutInt(), this->position(t)); |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 643 | break; |
| 644 | case LayoutToken::OFFSET: |
Ethan Nicholas | df803aa | 2021-08-29 14:22:45 -0400 | [diff] [blame] | 645 | result.offset(this->layoutInt(), this->position(t)); |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 646 | break; |
| 647 | case LayoutToken::BINDING: |
Ethan Nicholas | df803aa | 2021-08-29 14:22:45 -0400 | [diff] [blame] | 648 | result.binding(this->layoutInt(), this->position(t)); |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 649 | break; |
| 650 | case LayoutToken::INDEX: |
Ethan Nicholas | df803aa | 2021-08-29 14:22:45 -0400 | [diff] [blame] | 651 | result.index(this->layoutInt(), this->position(t)); |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 652 | break; |
| 653 | case LayoutToken::SET: |
Ethan Nicholas | df803aa | 2021-08-29 14:22:45 -0400 | [diff] [blame] | 654 | result.set(this->layoutInt(), this->position(t)); |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 655 | break; |
| 656 | case LayoutToken::BUILTIN: |
Ethan Nicholas | df803aa | 2021-08-29 14:22:45 -0400 | [diff] [blame] | 657 | result.builtin(this->layoutInt(), this->position(t)); |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 658 | break; |
| 659 | case LayoutToken::INPUT_ATTACHMENT_INDEX: |
Ethan Nicholas | df803aa | 2021-08-29 14:22:45 -0400 | [diff] [blame] | 660 | result.inputAttachmentIndex(this->layoutInt(), this->position(t)); |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 661 | break; |
| 662 | default: |
| 663 | this->error(t, "'" + text + "' is not a valid layout qualifier"); |
| 664 | break; |
| 665 | } |
| 666 | } else { |
| 667 | this->error(t, "'" + text + "' is not a valid layout qualifier"); |
| 668 | } |
| 669 | if (this->checkNext(Token::Kind::TK_RPAREN)) { |
| 670 | break; |
| 671 | } |
| 672 | if (!this->expect(Token::Kind::TK_COMMA, "','")) { |
| 673 | break; |
| 674 | } |
| 675 | } |
| 676 | } |
| 677 | return result; |
| 678 | } |
| 679 | |
| 680 | /* layout? (UNIFORM | CONST | IN | OUT | INOUT | LOWP | MEDIUMP | HIGHP | FLAT | NOPERSPECTIVE | |
| 681 | VARYING | INLINE)* */ |
| 682 | DSLModifiers DSLParser::modifiers() { |
| 683 | DSLLayout layout = this->layout(); |
| 684 | int flags = 0; |
| 685 | for (;;) { |
| 686 | // TODO(ethannicholas): handle duplicate / incompatible flags |
| 687 | int tokenFlag = parse_modifier_token(peek().fKind); |
| 688 | if (!tokenFlag) { |
| 689 | break; |
| 690 | } |
| 691 | flags |= tokenFlag; |
| 692 | this->nextToken(); |
| 693 | } |
| 694 | return DSLModifiers(std::move(layout), flags); |
| 695 | } |
| 696 | |
| 697 | DSLModifiers DSLParser::modifiersWithDefaults(int defaultFlags) { |
| 698 | DSLModifiers result = this->modifiers(); |
| 699 | if (defaultFlags && !result.flags()) { |
| 700 | return DSLModifiers(result.layout(), defaultFlags); |
| 701 | } |
| 702 | return result; |
| 703 | } |
| 704 | |
| 705 | /* ifStatement | forStatement | doStatement | whileStatement | block | expression */ |
| 706 | skstd::optional<DSLStatement> DSLParser::statement() { |
| 707 | Token start = this->nextToken(); |
| 708 | AutoDSLDepth depth(this); |
| 709 | if (!depth.increase()) { |
| 710 | return skstd::nullopt; |
| 711 | } |
| 712 | this->pushback(start); |
| 713 | switch (start.fKind) { |
| 714 | case Token::Kind::TK_IF: // fall through |
| 715 | case Token::Kind::TK_STATIC_IF: |
| 716 | return this->ifStatement(); |
| 717 | case Token::Kind::TK_FOR: |
| 718 | return this->forStatement(); |
| 719 | case Token::Kind::TK_DO: |
| 720 | return this->doStatement(); |
| 721 | case Token::Kind::TK_WHILE: |
| 722 | return this->whileStatement(); |
| 723 | case Token::Kind::TK_SWITCH: // fall through |
| 724 | case Token::Kind::TK_STATIC_SWITCH: |
| 725 | return this->switchStatement(); |
| 726 | case Token::Kind::TK_RETURN: |
| 727 | return this->returnStatement(); |
| 728 | case Token::Kind::TK_BREAK: |
| 729 | return this->breakStatement(); |
| 730 | case Token::Kind::TK_CONTINUE: |
| 731 | return this->continueStatement(); |
| 732 | case Token::Kind::TK_DISCARD: |
| 733 | return this->discardStatement(); |
| 734 | case Token::Kind::TK_LBRACE: { |
| 735 | skstd::optional<DSLBlock> result = this->block(); |
| 736 | return result ? skstd::optional<DSLStatement>(std::move(*result)) |
| 737 | : skstd::optional<DSLStatement>(); |
| 738 | } |
| 739 | case Token::Kind::TK_SEMICOLON: |
| 740 | this->nextToken(); |
| 741 | return dsl::Block(); |
John Stiles | 0201431 | 2021-08-04 16:03:12 -0400 | [diff] [blame] | 742 | case Token::Kind::TK_HIGHP: |
| 743 | case Token::Kind::TK_MEDIUMP: |
| 744 | case Token::Kind::TK_LOWP: |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 745 | case Token::Kind::TK_CONST: |
| 746 | case Token::Kind::TK_IDENTIFIER: |
| 747 | return this->varDeclarationsOrExpressionStatement(); |
| 748 | default: |
| 749 | return this->expressionStatement(); |
| 750 | } |
| 751 | } |
| 752 | |
| 753 | /* IDENTIFIER(type) (LBRACKET intLiteral? RBRACKET)* QUESTION? */ |
John Stiles | e53c721 | 2021-08-05 10:19:11 -0400 | [diff] [blame] | 754 | skstd::optional<DSLType> DSLParser::type(const DSLModifiers& modifiers) { |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 755 | Token type; |
| 756 | if (!this->expect(Token::Kind::TK_IDENTIFIER, "a type", &type)) { |
| 757 | return skstd::nullopt; |
| 758 | } |
| 759 | if (!IsType(this->text(type))) { |
| 760 | this->error(type, ("no type named '" + this->text(type) + "'").c_str()); |
| 761 | return skstd::nullopt; |
| 762 | } |
Ethan Nicholas | a248a9a | 2021-09-01 16:40:25 -0400 | [diff] [blame] | 763 | DSLType result(this->text(type), modifiers, this->position(type)); |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 764 | while (this->checkNext(Token::Kind::TK_LBRACKET)) { |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 765 | if (this->peek().fKind != Token::Kind::TK_RBRACKET) { |
Ethan Nicholas | 6f20b8d | 2021-08-31 07:40:24 -0400 | [diff] [blame] | 766 | result = Array(result, this->arraySize(), this->position(type)); |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 767 | } else { |
| 768 | this->error(this->peek(), "expected array dimension"); |
| 769 | } |
| 770 | this->expect(Token::Kind::TK_RBRACKET, "']'"); |
| 771 | } |
| 772 | return result; |
| 773 | } |
| 774 | |
| 775 | /* IDENTIFIER LBRACE |
| 776 | varDeclaration+ |
| 777 | RBRACE (IDENTIFIER (LBRACKET expression? RBRACKET)*)? SEMICOLON */ |
John Stiles | e53c721 | 2021-08-05 10:19:11 -0400 | [diff] [blame] | 778 | bool DSLParser::interfaceBlock(const dsl::DSLModifiers& modifiers) { |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 779 | Token typeName; |
| 780 | if (!this->expectIdentifier(&typeName)) { |
| 781 | return false; |
| 782 | } |
| 783 | if (peek().fKind != Token::Kind::TK_LBRACE) { |
| 784 | // we only get into interfaceBlock if we found a top-level identifier which was not a type. |
| 785 | // 99% of the time, the user was not actually intending to create an interface block, so |
| 786 | // it's better to report it as an unknown type |
| 787 | this->error(typeName, "no type named '" + this->text(typeName) + "'"); |
| 788 | return false; |
| 789 | } |
| 790 | this->nextToken(); |
| 791 | SkTArray<dsl::Field> fields; |
| 792 | while (!this->checkNext(Token::Kind::TK_RBRACE)) { |
Ethan Nicholas | 5c4463e | 2021-08-29 14:31:19 -0400 | [diff] [blame] | 793 | DSLModifiers fieldModifiers = this->modifiers(); |
| 794 | skstd::optional<dsl::DSLType> type = this->type(fieldModifiers); |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 795 | if (!type) { |
| 796 | return false; |
| 797 | } |
| 798 | do { |
| 799 | Token fieldName; |
| 800 | if (!this->expect(Token::Kind::TK_IDENTIFIER, "an identifier", &fieldName)) { |
| 801 | return false; |
| 802 | } |
| 803 | DSLType actualType = *type; |
| 804 | if (this->checkNext(Token::Kind::TK_LBRACKET)) { |
| 805 | Token sizeToken = this->peek(); |
| 806 | if (sizeToken.fKind != Token::Kind::TK_RBRACKET) { |
Ethan Nicholas | 6f20b8d | 2021-08-31 07:40:24 -0400 | [diff] [blame] | 807 | actualType = Array(std::move(actualType), this->arraySize(), |
| 808 | this->position(typeName)); |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 809 | } else { |
| 810 | this->error(sizeToken, "unsized arrays are not permitted"); |
| 811 | } |
| 812 | this->expect(Token::Kind::TK_RBRACKET, "']'"); |
| 813 | } |
| 814 | if (!this->expect(Token::Kind::TK_SEMICOLON, "';'")) { |
| 815 | return false; |
| 816 | } |
Ethan Nicholas | 2763323 | 2021-08-29 13:51:44 -0400 | [diff] [blame] | 817 | fields.push_back(dsl::Field(fieldModifiers, std::move(actualType), |
| 818 | this->text(fieldName), this->position(fieldName))); |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 819 | } |
| 820 | while (this->checkNext(Token::Kind::TK_COMMA)); |
| 821 | } |
| 822 | if (fields.empty()) { |
| 823 | this->error(typeName, "interface block '" + this->text(typeName) + |
| 824 | "' must contain at least one member"); |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 825 | } |
| 826 | skstd::string_view instanceName; |
| 827 | Token instanceNameToken; |
| 828 | SKSL_INT arraySize = 0; |
| 829 | if (this->checkNext(Token::Kind::TK_IDENTIFIER, &instanceNameToken)) { |
| 830 | instanceName = this->text(instanceNameToken); |
| 831 | if (this->checkNext(Token::Kind::TK_LBRACKET)) { |
Ethan Nicholas | 6f20b8d | 2021-08-31 07:40:24 -0400 | [diff] [blame] | 832 | arraySize = this->arraySize(); |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 833 | this->expect(Token::Kind::TK_RBRACKET, "']'"); |
| 834 | } |
| 835 | } |
Ethan Nicholas | e110f6e | 2021-08-29 14:03:06 -0400 | [diff] [blame] | 836 | this->expect(Token::Kind::TK_SEMICOLON, "';'"); |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 837 | dsl::InterfaceBlock(modifiers, this->text(typeName), std::move(fields), instanceName, |
| 838 | arraySize); |
| 839 | return true; |
| 840 | } |
| 841 | |
| 842 | /* IF LPAREN expression RPAREN statement (ELSE statement)? */ |
| 843 | skstd::optional<DSLStatement> DSLParser::ifStatement() { |
| 844 | Token start; |
| 845 | bool isStatic = this->checkNext(Token::Kind::TK_STATIC_IF, &start); |
| 846 | if (!isStatic && !this->expect(Token::Kind::TK_IF, "'if'", &start)) { |
| 847 | return skstd::nullopt; |
| 848 | } |
| 849 | if (!this->expect(Token::Kind::TK_LPAREN, "'('")) { |
| 850 | return skstd::nullopt; |
| 851 | } |
| 852 | skstd::optional<DSLWrapper<DSLExpression>> test = this->expression(); |
| 853 | if (!test) { |
| 854 | return skstd::nullopt; |
| 855 | } |
| 856 | if (!this->expect(Token::Kind::TK_RPAREN, "')'")) { |
| 857 | return skstd::nullopt; |
| 858 | } |
| 859 | skstd::optional<DSLStatement> ifTrue = this->statement(); |
| 860 | if (!ifTrue) { |
| 861 | return skstd::nullopt; |
| 862 | } |
| 863 | skstd::optional<DSLStatement> ifFalse; |
| 864 | if (this->checkNext(Token::Kind::TK_ELSE)) { |
| 865 | ifFalse = this->statement(); |
| 866 | if (!ifFalse) { |
| 867 | return skstd::nullopt; |
| 868 | } |
| 869 | } |
| 870 | if (isStatic) { |
| 871 | return StaticIf(std::move(**test), std::move(*ifTrue), |
Ethan Nicholas | 6f20b8d | 2021-08-31 07:40:24 -0400 | [diff] [blame] | 872 | ifFalse ? std::move(*ifFalse) : DSLStatement(), this->position(start)); |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 873 | } else { |
| 874 | return If(std::move(**test), std::move(*ifTrue), |
Ethan Nicholas | 6f20b8d | 2021-08-31 07:40:24 -0400 | [diff] [blame] | 875 | ifFalse ? std::move(*ifFalse) : DSLStatement(), this->position(start)); |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 876 | } |
| 877 | } |
| 878 | |
| 879 | /* DO statement WHILE LPAREN expression RPAREN SEMICOLON */ |
| 880 | skstd::optional<DSLStatement> DSLParser::doStatement() { |
| 881 | Token start; |
| 882 | if (!this->expect(Token::Kind::TK_DO, "'do'", &start)) { |
| 883 | return skstd::nullopt; |
| 884 | } |
| 885 | skstd::optional<DSLStatement> statement = this->statement(); |
| 886 | if (!statement) { |
| 887 | return skstd::nullopt; |
| 888 | } |
| 889 | if (!this->expect(Token::Kind::TK_WHILE, "'while'")) { |
| 890 | return skstd::nullopt; |
| 891 | } |
| 892 | if (!this->expect(Token::Kind::TK_LPAREN, "'('")) { |
| 893 | return skstd::nullopt; |
| 894 | } |
| 895 | skstd::optional<DSLWrapper<DSLExpression>> test = this->expression(); |
| 896 | if (!test) { |
| 897 | return skstd::nullopt; |
| 898 | } |
| 899 | if (!this->expect(Token::Kind::TK_RPAREN, "')'")) { |
| 900 | return skstd::nullopt; |
| 901 | } |
| 902 | if (!this->expect(Token::Kind::TK_SEMICOLON, "';'")) { |
| 903 | return skstd::nullopt; |
| 904 | } |
| 905 | return Do(std::move(*statement), std::move(**test)); |
| 906 | } |
| 907 | |
| 908 | /* WHILE LPAREN expression RPAREN STATEMENT */ |
| 909 | skstd::optional<DSLStatement> DSLParser::whileStatement() { |
| 910 | Token start; |
| 911 | if (!this->expect(Token::Kind::TK_WHILE, "'while'", &start)) { |
| 912 | return skstd::nullopt; |
| 913 | } |
| 914 | if (!this->expect(Token::Kind::TK_LPAREN, "'('")) { |
| 915 | return skstd::nullopt; |
| 916 | } |
| 917 | skstd::optional<DSLWrapper<DSLExpression>> test = this->expression(); |
| 918 | if (!test) { |
| 919 | return skstd::nullopt; |
| 920 | } |
| 921 | if (!this->expect(Token::Kind::TK_RPAREN, "')'")) { |
| 922 | return skstd::nullopt; |
| 923 | } |
| 924 | skstd::optional<DSLStatement> statement = this->statement(); |
| 925 | if (!statement) { |
| 926 | return skstd::nullopt; |
| 927 | } |
| 928 | return While(std::move(**test), std::move(*statement)); |
| 929 | } |
| 930 | |
| 931 | /* CASE expression COLON statement* */ |
| 932 | skstd::optional<DSLCase> DSLParser::switchCase() { |
| 933 | Token start; |
| 934 | if (!this->expect(Token::Kind::TK_CASE, "'case'", &start)) { |
| 935 | return skstd::nullopt; |
| 936 | } |
| 937 | skstd::optional<DSLWrapper<DSLExpression>> value = this->expression(); |
| 938 | if (!value) { |
| 939 | return skstd::nullopt; |
| 940 | } |
| 941 | if (!this->expect(Token::Kind::TK_COLON, "':'")) { |
| 942 | return skstd::nullopt; |
| 943 | } |
| 944 | SkTArray<DSLStatement> statements; |
| 945 | while (this->peek().fKind != Token::Kind::TK_RBRACE && |
| 946 | this->peek().fKind != Token::Kind::TK_CASE && |
| 947 | this->peek().fKind != Token::Kind::TK_DEFAULT) { |
| 948 | skstd::optional<DSLStatement> s = this->statement(); |
| 949 | if (!s) { |
| 950 | return skstd::nullopt; |
| 951 | } |
| 952 | statements.push_back(std::move(*s)); |
| 953 | } |
| 954 | return DSLCase(std::move(**value), std::move(statements)); |
| 955 | } |
| 956 | |
| 957 | /* SWITCH LPAREN expression RPAREN LBRACE switchCase* (DEFAULT COLON statement*)? RBRACE */ |
| 958 | skstd::optional<DSLStatement> DSLParser::switchStatement() { |
| 959 | Token start; |
| 960 | bool isStatic = this->checkNext(Token::Kind::TK_STATIC_SWITCH, &start); |
| 961 | if (!isStatic && !this->expect(Token::Kind::TK_SWITCH, "'switch'", &start)) { |
| 962 | return skstd::nullopt; |
| 963 | } |
| 964 | if (!this->expect(Token::Kind::TK_LPAREN, "'('")) { |
| 965 | return skstd::nullopt; |
| 966 | } |
| 967 | skstd::optional<DSLWrapper<DSLExpression>> value = this->expression(); |
| 968 | if (!value) { |
| 969 | return skstd::nullopt; |
| 970 | } |
| 971 | if (!this->expect(Token::Kind::TK_RPAREN, "')'")) { |
| 972 | return skstd::nullopt; |
| 973 | } |
| 974 | if (!this->expect(Token::Kind::TK_LBRACE, "'{'")) { |
| 975 | return skstd::nullopt; |
| 976 | } |
| 977 | SkTArray<DSLCase> cases; |
| 978 | while (this->peek().fKind == Token::Kind::TK_CASE) { |
| 979 | skstd::optional<DSLCase> c = this->switchCase(); |
| 980 | if (!c) { |
| 981 | return skstd::nullopt; |
| 982 | } |
| 983 | cases.push_back(std::move(*c)); |
| 984 | } |
| 985 | // Requiring default: to be last (in defiance of C and GLSL) was a deliberate decision. Other |
| 986 | // parts of the compiler may rely upon this assumption. |
| 987 | if (this->peek().fKind == Token::Kind::TK_DEFAULT) { |
| 988 | SkTArray<DSLStatement> statements; |
| 989 | Token defaultStart; |
| 990 | SkAssertResult(this->expect(Token::Kind::TK_DEFAULT, "'default'", &defaultStart)); |
| 991 | if (!this->expect(Token::Kind::TK_COLON, "':'")) { |
| 992 | return skstd::nullopt; |
| 993 | } |
| 994 | while (this->peek().fKind != Token::Kind::TK_RBRACE) { |
| 995 | skstd::optional<DSLStatement> s = this->statement(); |
| 996 | if (!s) { |
| 997 | return skstd::nullopt; |
| 998 | } |
| 999 | statements.push_back(std::move(*s)); |
| 1000 | } |
| 1001 | cases.push_back(DSLCase(DSLExpression(), std::move(statements))); |
| 1002 | } |
| 1003 | if (!this->expect(Token::Kind::TK_RBRACE, "'}'")) { |
| 1004 | return skstd::nullopt; |
| 1005 | } |
| 1006 | if (isStatic) { |
| 1007 | return StaticSwitch(std::move(**value), std::move(cases)); |
| 1008 | } else { |
| 1009 | return Switch(std::move(**value), std::move(cases)); |
| 1010 | } |
| 1011 | } |
| 1012 | |
| 1013 | /* FOR LPAREN (declaration | expression)? SEMICOLON expression? SEMICOLON expression? RPAREN |
| 1014 | STATEMENT */ |
| 1015 | skstd::optional<dsl::DSLStatement> DSLParser::forStatement() { |
| 1016 | Token start; |
| 1017 | if (!this->expect(Token::Kind::TK_FOR, "'for'", &start)) { |
| 1018 | return skstd::nullopt; |
| 1019 | } |
| 1020 | if (!this->expect(Token::Kind::TK_LPAREN, "'('")) { |
| 1021 | return skstd::nullopt; |
| 1022 | } |
| 1023 | AutoDSLSymbolTable symbols; |
| 1024 | skstd::optional<dsl::DSLStatement> initializer; |
| 1025 | Token nextToken = this->peek(); |
| 1026 | if (nextToken.fKind == Token::Kind::TK_SEMICOLON) { |
| 1027 | // An empty init-statement. |
| 1028 | this->nextToken(); |
| 1029 | } else { |
| 1030 | // The init-statement must be an expression or variable declaration. |
| 1031 | initializer = this->varDeclarationsOrExpressionStatement(); |
| 1032 | if (!initializer) { |
| 1033 | return skstd::nullopt; |
| 1034 | } |
| 1035 | } |
| 1036 | skstd::optional<DSLWrapper<DSLExpression>> test; |
| 1037 | if (this->peek().fKind != Token::Kind::TK_SEMICOLON) { |
| 1038 | test = this->expression(); |
| 1039 | if (!test) { |
| 1040 | return skstd::nullopt; |
| 1041 | } |
| 1042 | } |
| 1043 | if (!this->expect(Token::Kind::TK_SEMICOLON, "';'")) { |
| 1044 | return skstd::nullopt; |
| 1045 | } |
| 1046 | skstd::optional<DSLWrapper<DSLExpression>> next; |
| 1047 | if (this->peek().fKind != Token::Kind::TK_RPAREN) { |
| 1048 | next = this->expression(); |
| 1049 | if (!next) { |
| 1050 | return skstd::nullopt; |
| 1051 | } |
| 1052 | } |
| 1053 | if (!this->expect(Token::Kind::TK_RPAREN, "')'")) { |
| 1054 | return skstd::nullopt; |
| 1055 | } |
| 1056 | skstd::optional<dsl::DSLStatement> statement = this->statement(); |
| 1057 | if (!statement) { |
| 1058 | return skstd::nullopt; |
| 1059 | } |
| 1060 | return For(initializer ? std::move(*initializer) : DSLStatement(), |
| 1061 | test ? std::move(**test) : DSLExpression(), |
| 1062 | next ? std::move(**next) : DSLExpression(), |
| 1063 | std::move(*statement)); |
| 1064 | } |
| 1065 | |
| 1066 | /* RETURN expression? SEMICOLON */ |
| 1067 | skstd::optional<DSLStatement> DSLParser::returnStatement() { |
| 1068 | Token start; |
| 1069 | if (!this->expect(Token::Kind::TK_RETURN, "'return'", &start)) { |
| 1070 | return skstd::nullopt; |
| 1071 | } |
| 1072 | skstd::optional<DSLWrapper<DSLExpression>> expression; |
| 1073 | if (this->peek().fKind != Token::Kind::TK_SEMICOLON) { |
| 1074 | expression = this->expression(); |
| 1075 | if (!expression) { |
| 1076 | return skstd::nullopt; |
| 1077 | } |
| 1078 | } |
| 1079 | if (!this->expect(Token::Kind::TK_SEMICOLON, "';'")) { |
| 1080 | return skstd::nullopt; |
| 1081 | } |
| 1082 | return Return(expression ? std::move(**expression) : DSLExpression()); |
| 1083 | } |
| 1084 | |
| 1085 | /* BREAK SEMICOLON */ |
| 1086 | skstd::optional<DSLStatement> DSLParser::breakStatement() { |
| 1087 | Token start; |
| 1088 | if (!this->expect(Token::Kind::TK_BREAK, "'break'", &start)) { |
| 1089 | return skstd::nullopt; |
| 1090 | } |
| 1091 | if (!this->expect(Token::Kind::TK_SEMICOLON, "';'")) { |
| 1092 | return skstd::nullopt; |
| 1093 | } |
Ethan Nicholas | 6f20b8d | 2021-08-31 07:40:24 -0400 | [diff] [blame] | 1094 | return Break(this->position(start)); |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 1095 | } |
| 1096 | |
| 1097 | /* CONTINUE SEMICOLON */ |
| 1098 | skstd::optional<DSLStatement> DSLParser::continueStatement() { |
| 1099 | Token start; |
| 1100 | if (!this->expect(Token::Kind::TK_CONTINUE, "'continue'", &start)) { |
| 1101 | return skstd::nullopt; |
| 1102 | } |
| 1103 | if (!this->expect(Token::Kind::TK_SEMICOLON, "';'")) { |
| 1104 | return skstd::nullopt; |
| 1105 | } |
Ethan Nicholas | 6f20b8d | 2021-08-31 07:40:24 -0400 | [diff] [blame] | 1106 | return Continue(this->position(start)); |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 1107 | } |
| 1108 | |
| 1109 | /* DISCARD SEMICOLON */ |
| 1110 | skstd::optional<DSLStatement> DSLParser::discardStatement() { |
| 1111 | Token start; |
| 1112 | if (!this->expect(Token::Kind::TK_DISCARD, "'continue'", &start)) { |
| 1113 | return skstd::nullopt; |
| 1114 | } |
| 1115 | if (!this->expect(Token::Kind::TK_SEMICOLON, "';'")) { |
| 1116 | return skstd::nullopt; |
| 1117 | } |
| 1118 | return Discard(); |
| 1119 | } |
| 1120 | |
| 1121 | /* LBRACE statement* RBRACE */ |
| 1122 | skstd::optional<DSLBlock> DSLParser::block() { |
| 1123 | Token start; |
| 1124 | if (!this->expect(Token::Kind::TK_LBRACE, "'{'", &start)) { |
| 1125 | return skstd::nullopt; |
| 1126 | } |
| 1127 | AutoDSLDepth depth(this); |
| 1128 | if (!depth.increase()) { |
| 1129 | return skstd::nullopt; |
| 1130 | } |
| 1131 | AutoDSLSymbolTable symbols; |
| 1132 | SkTArray<DSLStatement> statements; |
| 1133 | for (;;) { |
| 1134 | switch (this->peek().fKind) { |
| 1135 | case Token::Kind::TK_RBRACE: |
| 1136 | this->nextToken(); |
| 1137 | return DSLBlock(std::move(statements), CurrentSymbolTable()); |
| 1138 | case Token::Kind::TK_END_OF_FILE: |
| 1139 | this->error(this->peek(), "expected '}', but found end of file"); |
| 1140 | return skstd::nullopt; |
| 1141 | default: { |
| 1142 | skstd::optional<DSLStatement> statement = this->statement(); |
| 1143 | if (!statement) { |
| 1144 | return skstd::nullopt; |
| 1145 | } |
| 1146 | statements.push_back(std::move(*statement)); |
| 1147 | } |
| 1148 | } |
| 1149 | } |
| 1150 | } |
| 1151 | |
| 1152 | /* expression SEMICOLON */ |
| 1153 | skstd::optional<DSLStatement> DSLParser::expressionStatement() { |
| 1154 | skstd::optional<DSLWrapper<DSLExpression>> expr = this->expression(); |
| 1155 | if (expr) { |
| 1156 | if (!this->expect(Token::Kind::TK_SEMICOLON, "';'")) { |
| 1157 | return skstd::nullopt; |
| 1158 | } |
| 1159 | return {{DSLStatement(std::move(**expr))}}; |
| 1160 | } |
| 1161 | return skstd::nullopt; |
| 1162 | } |
| 1163 | |
| 1164 | /* assignmentExpression (COMMA assignmentExpression)* */ |
| 1165 | skstd::optional<DSLWrapper<DSLExpression>> DSLParser::expression() { |
| 1166 | skstd::optional<DSLWrapper<DSLExpression>> result = this->assignmentExpression(); |
| 1167 | if (!result) { |
| 1168 | return skstd::nullopt; |
| 1169 | } |
| 1170 | Token t; |
| 1171 | AutoDSLDepth depth(this); |
| 1172 | while (this->checkNext(Token::Kind::TK_COMMA, &t)) { |
| 1173 | if (!depth.increase()) { |
| 1174 | return skstd::nullopt; |
| 1175 | } |
| 1176 | skstd::optional<DSLWrapper<DSLExpression>> right = this->assignmentExpression(); |
| 1177 | if (!right) { |
| 1178 | return skstd::nullopt; |
| 1179 | } |
| 1180 | result = skstd::optional<DSLWrapper<DSLExpression>>(dsl::operator,(std::move(**result), |
| 1181 | std::move(**right))); |
| 1182 | } |
| 1183 | return result; |
| 1184 | } |
| 1185 | |
| 1186 | #define OPERATOR_RIGHT(op, exprType) \ |
| 1187 | do { \ |
| 1188 | this->nextToken(); \ |
| 1189 | if (!depth.increase()) { \ |
| 1190 | return skstd::nullopt; \ |
| 1191 | } \ |
| 1192 | skstd::optional<DSLWrapper<DSLExpression>> right = this->exprType(); \ |
| 1193 | if (!right) { \ |
| 1194 | return skstd::nullopt; \ |
| 1195 | } \ |
| 1196 | result = {{std::move(**result) op std::move(**right)}}; \ |
| 1197 | } while (false) |
| 1198 | |
| 1199 | /* ternaryExpression ((EQEQ | STAREQ | SLASHEQ | PERCENTEQ | PLUSEQ | MINUSEQ | SHLEQ | SHREQ | |
| 1200 | BITWISEANDEQ | BITWISEXOREQ | BITWISEOREQ | LOGICALANDEQ | LOGICALXOREQ | LOGICALOREQ) |
| 1201 | assignmentExpression)* |
| 1202 | */ |
| 1203 | skstd::optional<DSLWrapper<DSLExpression>> DSLParser::assignmentExpression() { |
| 1204 | AutoDSLDepth depth(this); |
| 1205 | skstd::optional<DSLWrapper<DSLExpression>> result = this->ternaryExpression(); |
| 1206 | if (!result) { |
| 1207 | return skstd::nullopt; |
| 1208 | } |
| 1209 | for (;;) { |
| 1210 | switch (this->peek().fKind) { |
| 1211 | case Token::Kind::TK_EQ: OPERATOR_RIGHT(=, assignmentExpression); break; |
| 1212 | case Token::Kind::TK_STAREQ: OPERATOR_RIGHT(*=, assignmentExpression); break; |
| 1213 | case Token::Kind::TK_SLASHEQ: OPERATOR_RIGHT(/=, assignmentExpression); break; |
| 1214 | case Token::Kind::TK_PERCENTEQ: OPERATOR_RIGHT(%=, assignmentExpression); break; |
| 1215 | case Token::Kind::TK_PLUSEQ: OPERATOR_RIGHT(+=, assignmentExpression); break; |
| 1216 | case Token::Kind::TK_MINUSEQ: OPERATOR_RIGHT(-=, assignmentExpression); break; |
| 1217 | case Token::Kind::TK_SHLEQ: OPERATOR_RIGHT(<<=, assignmentExpression); break; |
| 1218 | case Token::Kind::TK_SHREQ: OPERATOR_RIGHT(>>=, assignmentExpression); break; |
| 1219 | case Token::Kind::TK_BITWISEANDEQ: OPERATOR_RIGHT(&=, assignmentExpression); break; |
| 1220 | case Token::Kind::TK_BITWISEXOREQ: OPERATOR_RIGHT(^=, assignmentExpression); break; |
| 1221 | case Token::Kind::TK_BITWISEOREQ: OPERATOR_RIGHT(|=, assignmentExpression); break; |
| 1222 | default: |
| 1223 | return result; |
| 1224 | } |
| 1225 | } |
| 1226 | } |
| 1227 | |
| 1228 | /* logicalOrExpression ('?' expression ':' assignmentExpression)? */ |
| 1229 | skstd::optional<DSLWrapper<DSLExpression>> DSLParser::ternaryExpression() { |
| 1230 | AutoDSLDepth depth(this); |
| 1231 | skstd::optional<DSLWrapper<DSLExpression>> base = this->logicalOrExpression(); |
| 1232 | if (!base) { |
| 1233 | return skstd::nullopt; |
| 1234 | } |
| 1235 | if (this->checkNext(Token::Kind::TK_QUESTION)) { |
| 1236 | if (!depth.increase()) { |
| 1237 | return skstd::nullopt; |
| 1238 | } |
| 1239 | skstd::optional<DSLWrapper<DSLExpression>> trueExpr = this->expression(); |
| 1240 | if (!trueExpr) { |
| 1241 | return skstd::nullopt; |
| 1242 | } |
| 1243 | if (this->expect(Token::Kind::TK_COLON, "':'")) { |
| 1244 | skstd::optional<DSLWrapper<DSLExpression>> falseExpr = this->assignmentExpression(); |
| 1245 | if (!falseExpr) { |
| 1246 | return skstd::nullopt; |
| 1247 | } |
| 1248 | return Select(std::move(**base), std::move(**trueExpr), std::move(**falseExpr)); |
| 1249 | } |
| 1250 | return skstd::nullopt; |
| 1251 | } |
| 1252 | return base; |
| 1253 | } |
| 1254 | |
| 1255 | /* logicalXorExpression (LOGICALOR logicalXorExpression)* */ |
| 1256 | skstd::optional<DSLWrapper<DSLExpression>> DSLParser::logicalOrExpression() { |
| 1257 | AutoDSLDepth depth(this); |
| 1258 | skstd::optional<DSLWrapper<DSLExpression>> result = this->logicalXorExpression(); |
| 1259 | if (!result) { |
| 1260 | return skstd::nullopt; |
| 1261 | } |
| 1262 | while (this->peek().fKind == Token::Kind::TK_LOGICALOR) { |
| 1263 | OPERATOR_RIGHT(||, logicalXorExpression); |
| 1264 | } |
| 1265 | return result; |
| 1266 | } |
| 1267 | |
| 1268 | /* logicalAndExpression (LOGICALXOR logicalAndExpression)* */ |
| 1269 | skstd::optional<DSLWrapper<DSLExpression>> DSLParser::logicalXorExpression() { |
| 1270 | AutoDSLDepth depth(this); |
| 1271 | skstd::optional<DSLWrapper<DSLExpression>> result = this->logicalAndExpression(); |
| 1272 | if (!result) { |
| 1273 | return skstd::nullopt; |
| 1274 | } |
| 1275 | while (this->checkNext(Token::Kind::TK_LOGICALXOR)) { |
| 1276 | if (!depth.increase()) { |
| 1277 | return skstd::nullopt; |
| 1278 | } |
| 1279 | skstd::optional<DSLWrapper<DSLExpression>> right = this->logicalAndExpression(); |
| 1280 | if (!right) { |
| 1281 | return skstd::nullopt; |
| 1282 | } |
| 1283 | result = {{LogicalXor(std::move(**result), std::move(**right))}}; |
| 1284 | } |
| 1285 | return result; |
| 1286 | } |
| 1287 | |
| 1288 | /* bitwiseOrExpression (LOGICALAND bitwiseOrExpression)* */ |
| 1289 | skstd::optional<DSLWrapper<DSLExpression>> DSLParser::logicalAndExpression() { |
| 1290 | AutoDSLDepth depth(this); |
| 1291 | skstd::optional<DSLWrapper<DSLExpression>> result = this->bitwiseOrExpression(); |
| 1292 | if (!result) { |
| 1293 | return skstd::nullopt; |
| 1294 | } |
| 1295 | while (this->peek().fKind == Token::Kind::TK_LOGICALAND) { |
| 1296 | OPERATOR_RIGHT(&&, bitwiseOrExpression); |
| 1297 | } |
| 1298 | return result; |
| 1299 | } |
| 1300 | |
| 1301 | /* bitwiseXorExpression (BITWISEOR bitwiseXorExpression)* */ |
| 1302 | skstd::optional<DSLWrapper<DSLExpression>> DSLParser::bitwiseOrExpression() { |
| 1303 | AutoDSLDepth depth(this); |
| 1304 | skstd::optional<DSLWrapper<DSLExpression>> result = this->bitwiseXorExpression(); |
| 1305 | if (!result) { |
| 1306 | return skstd::nullopt; |
| 1307 | } |
| 1308 | while (this->peek().fKind == Token::Kind::TK_BITWISEOR) { |
| 1309 | OPERATOR_RIGHT(|, bitwiseXorExpression); |
| 1310 | } |
| 1311 | return result; |
| 1312 | } |
| 1313 | |
| 1314 | /* bitwiseAndExpression (BITWISEXOR bitwiseAndExpression)* */ |
| 1315 | skstd::optional<DSLWrapper<DSLExpression>> DSLParser::bitwiseXorExpression() { |
| 1316 | AutoDSLDepth depth(this); |
| 1317 | skstd::optional<DSLWrapper<DSLExpression>> result = this->bitwiseAndExpression(); |
| 1318 | if (!result) { |
| 1319 | return skstd::nullopt; |
| 1320 | } |
| 1321 | while (this->peek().fKind == Token::Kind::TK_BITWISEXOR) { |
| 1322 | OPERATOR_RIGHT(^, bitwiseAndExpression); |
| 1323 | } |
| 1324 | return result; |
| 1325 | } |
| 1326 | |
| 1327 | /* equalityExpression (BITWISEAND equalityExpression)* */ |
| 1328 | skstd::optional<DSLWrapper<DSLExpression>> DSLParser::bitwiseAndExpression() { |
| 1329 | AutoDSLDepth depth(this); |
| 1330 | skstd::optional<DSLWrapper<DSLExpression>> result = this->equalityExpression(); |
| 1331 | if (!result) { |
| 1332 | return skstd::nullopt; |
| 1333 | } |
| 1334 | while (this->peek().fKind == Token::Kind::TK_BITWISEAND) { |
| 1335 | OPERATOR_RIGHT(&, equalityExpression); |
| 1336 | } |
| 1337 | return result; |
| 1338 | } |
| 1339 | |
| 1340 | /* relationalExpression ((EQEQ | NEQ) relationalExpression)* */ |
| 1341 | skstd::optional<DSLWrapper<DSLExpression>> DSLParser::equalityExpression() { |
| 1342 | AutoDSLDepth depth(this); |
| 1343 | skstd::optional<DSLWrapper<DSLExpression>> result = this->relationalExpression(); |
| 1344 | if (!result) { |
| 1345 | return skstd::nullopt; |
| 1346 | } |
| 1347 | for (;;) { |
| 1348 | switch (this->peek().fKind) { |
| 1349 | case Token::Kind::TK_EQEQ: OPERATOR_RIGHT(==, relationalExpression); break; |
| 1350 | case Token::Kind::TK_NEQ: OPERATOR_RIGHT(!=, relationalExpression); break; |
| 1351 | default: return result; |
| 1352 | } |
| 1353 | } |
| 1354 | } |
| 1355 | |
| 1356 | /* shiftExpression ((LT | GT | LTEQ | GTEQ) shiftExpression)* */ |
| 1357 | skstd::optional<DSLWrapper<DSLExpression>> DSLParser::relationalExpression() { |
| 1358 | AutoDSLDepth depth(this); |
| 1359 | skstd::optional<DSLWrapper<DSLExpression>> result = this->shiftExpression(); |
| 1360 | if (!result) { |
| 1361 | return skstd::nullopt; |
| 1362 | } |
| 1363 | for (;;) { |
| 1364 | switch (this->peek().fKind) { |
| 1365 | case Token::Kind::TK_LT: OPERATOR_RIGHT(<, shiftExpression); break; |
| 1366 | case Token::Kind::TK_GT: OPERATOR_RIGHT(>, shiftExpression); break; |
| 1367 | case Token::Kind::TK_LTEQ: OPERATOR_RIGHT(<=, shiftExpression); break; |
| 1368 | case Token::Kind::TK_GTEQ: OPERATOR_RIGHT(>=, shiftExpression); break; |
| 1369 | default: return result; |
| 1370 | } |
| 1371 | } |
| 1372 | } |
| 1373 | |
| 1374 | /* additiveExpression ((SHL | SHR) additiveExpression)* */ |
| 1375 | skstd::optional<DSLWrapper<DSLExpression>> DSLParser::shiftExpression() { |
| 1376 | AutoDSLDepth depth(this); |
| 1377 | skstd::optional<DSLWrapper<DSLExpression>> result = this->additiveExpression(); |
| 1378 | if (!result) { |
| 1379 | return skstd::nullopt; |
| 1380 | } |
| 1381 | for (;;) { |
| 1382 | switch (this->peek().fKind) { |
| 1383 | case Token::Kind::TK_SHL: OPERATOR_RIGHT(<<, additiveExpression); break; |
| 1384 | case Token::Kind::TK_SHR: OPERATOR_RIGHT(>>, additiveExpression); break; |
| 1385 | default: return result; |
| 1386 | } |
| 1387 | } |
| 1388 | } |
| 1389 | |
| 1390 | /* multiplicativeExpression ((PLUS | MINUS) multiplicativeExpression)* */ |
| 1391 | skstd::optional<DSLWrapper<DSLExpression>> DSLParser::additiveExpression() { |
| 1392 | AutoDSLDepth depth(this); |
| 1393 | skstd::optional<DSLWrapper<DSLExpression>> result = this->multiplicativeExpression(); |
| 1394 | if (!result) { |
| 1395 | return skstd::nullopt; |
| 1396 | } |
| 1397 | for (;;) { |
| 1398 | switch (this->peek().fKind) { |
| 1399 | case Token::Kind::TK_PLUS: OPERATOR_RIGHT(+, multiplicativeExpression); break; |
| 1400 | case Token::Kind::TK_MINUS: OPERATOR_RIGHT(-, multiplicativeExpression); break; |
| 1401 | default: return result; |
| 1402 | } |
| 1403 | } |
| 1404 | } |
| 1405 | |
| 1406 | /* unaryExpression ((STAR | SLASH | PERCENT) unaryExpression)* */ |
| 1407 | skstd::optional<DSLWrapper<DSLExpression>> DSLParser::multiplicativeExpression() { |
| 1408 | AutoDSLDepth depth(this); |
| 1409 | skstd::optional<DSLWrapper<DSLExpression>> result = this->unaryExpression(); |
| 1410 | if (!result) { |
| 1411 | return skstd::nullopt; |
| 1412 | } |
| 1413 | for (;;) { |
| 1414 | switch (this->peek().fKind) { |
| 1415 | case Token::Kind::TK_STAR: OPERATOR_RIGHT(*, unaryExpression); break; |
| 1416 | case Token::Kind::TK_SLASH: OPERATOR_RIGHT(/, unaryExpression); break; |
| 1417 | case Token::Kind::TK_PERCENT: OPERATOR_RIGHT(%, unaryExpression); break; |
| 1418 | default: return result; |
| 1419 | } |
| 1420 | } |
| 1421 | } |
| 1422 | |
| 1423 | /* postfixExpression | (PLUS | MINUS | NOT | PLUSPLUS | MINUSMINUS) unaryExpression */ |
| 1424 | skstd::optional<DSLWrapper<DSLExpression>> DSLParser::unaryExpression() { |
| 1425 | AutoDSLDepth depth(this); |
| 1426 | Token next = this->peek(); |
| 1427 | switch (next.fKind) { |
| 1428 | case Token::Kind::TK_PLUS: |
| 1429 | case Token::Kind::TK_MINUS: |
| 1430 | case Token::Kind::TK_LOGICALNOT: |
| 1431 | case Token::Kind::TK_BITWISENOT: |
| 1432 | case Token::Kind::TK_PLUSPLUS: |
| 1433 | case Token::Kind::TK_MINUSMINUS: { |
| 1434 | if (!depth.increase()) { |
| 1435 | return skstd::nullopt; |
| 1436 | } |
| 1437 | this->nextToken(); |
| 1438 | skstd::optional<DSLWrapper<DSLExpression>> expr = this->unaryExpression(); |
| 1439 | if (!expr) { |
| 1440 | return skstd::nullopt; |
| 1441 | } |
| 1442 | switch (next.fKind) { |
| 1443 | case Token::Kind::TK_PLUS: return {{ +std::move(**expr)}}; |
| 1444 | case Token::Kind::TK_MINUS: return {{ -std::move(**expr)}}; |
| 1445 | case Token::Kind::TK_LOGICALNOT: return {{ !std::move(**expr)}}; |
| 1446 | case Token::Kind::TK_BITWISENOT: return {{ ~std::move(**expr)}}; |
| 1447 | case Token::Kind::TK_PLUSPLUS: return {{++std::move(**expr)}}; |
| 1448 | case Token::Kind::TK_MINUSMINUS: return {{--std::move(**expr)}}; |
| 1449 | default: SkUNREACHABLE; |
| 1450 | } |
| 1451 | } |
| 1452 | default: |
| 1453 | return this->postfixExpression(); |
| 1454 | } |
| 1455 | } |
| 1456 | |
| 1457 | /* term suffix* */ |
| 1458 | skstd::optional<DSLWrapper<DSLExpression>> DSLParser::postfixExpression() { |
| 1459 | AutoDSLDepth depth(this); |
| 1460 | skstd::optional<DSLWrapper<DSLExpression>> result = this->term(); |
| 1461 | if (!result) { |
| 1462 | return skstd::nullopt; |
| 1463 | } |
| 1464 | for (;;) { |
| 1465 | Token t = this->peek(); |
| 1466 | switch (t.fKind) { |
| 1467 | case Token::Kind::TK_FLOAT_LITERAL: |
| 1468 | if (this->text(t)[0] != '.') { |
| 1469 | return result; |
| 1470 | } |
| 1471 | [[fallthrough]]; |
| 1472 | case Token::Kind::TK_LBRACKET: |
| 1473 | case Token::Kind::TK_DOT: |
| 1474 | case Token::Kind::TK_LPAREN: |
| 1475 | case Token::Kind::TK_PLUSPLUS: |
| 1476 | case Token::Kind::TK_MINUSMINUS: |
| 1477 | if (!depth.increase()) { |
| 1478 | return skstd::nullopt; |
| 1479 | } |
| 1480 | result = this->suffix(std::move(**result)); |
| 1481 | if (!result) { |
| 1482 | return skstd::nullopt; |
| 1483 | } |
| 1484 | break; |
| 1485 | default: |
| 1486 | return result; |
| 1487 | } |
| 1488 | } |
| 1489 | } |
| 1490 | |
| 1491 | skstd::optional<DSLWrapper<DSLExpression>> DSLParser::swizzle(int offset, DSLExpression base, |
| 1492 | skstd::string_view swizzleMask) { |
| 1493 | SkASSERT(swizzleMask.length() > 0); |
| 1494 | if (!base.type().isVector() && !base.type().isScalar()) { |
Ethan Nicholas | 6f20b8d | 2021-08-31 07:40:24 -0400 | [diff] [blame] | 1495 | return base.field(swizzleMask, this->position(offset)); |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 1496 | } |
| 1497 | int length = swizzleMask.length(); |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 1498 | SkSL::SwizzleComponent::Type components[4]; |
| 1499 | for (int i = 0; i < length; ++i) { |
Ethan Nicholas | be8f73d | 2021-08-28 19:50:03 -0400 | [diff] [blame] | 1500 | if (i >= 4) { |
| 1501 | this->error(offset, "too many components in swizzle mask"); |
| 1502 | return {{DSLExpression::Poison()}}; |
| 1503 | } |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 1504 | switch (swizzleMask[i]) { |
| 1505 | case '0': components[i] = SwizzleComponent::ZERO; break; |
| 1506 | case '1': components[i] = SwizzleComponent::ONE; break; |
Ethan Nicholas | b61a243 | 2021-09-02 16:38:43 -0400 | [diff] [blame^] | 1507 | case 'r': components[i] = SwizzleComponent::R; break; |
| 1508 | case 'x': components[i] = SwizzleComponent::X; break; |
| 1509 | case 's': components[i] = SwizzleComponent::S; break; |
| 1510 | case 'L': components[i] = SwizzleComponent::UL; break; |
| 1511 | case 'g': components[i] = SwizzleComponent::G; break; |
| 1512 | case 'y': components[i] = SwizzleComponent::Y; break; |
| 1513 | case 't': components[i] = SwizzleComponent::T; break; |
| 1514 | case 'T': components[i] = SwizzleComponent::UT; break; |
| 1515 | case 'b': components[i] = SwizzleComponent::B; break; |
| 1516 | case 'z': components[i] = SwizzleComponent::Z; break; |
| 1517 | case 'p': components[i] = SwizzleComponent::P; break; |
| 1518 | case 'R': components[i] = SwizzleComponent::UR; break; |
| 1519 | case 'a': components[i] = SwizzleComponent::A; break; |
| 1520 | case 'w': components[i] = SwizzleComponent::W; break; |
| 1521 | case 'q': components[i] = SwizzleComponent::Q; break; |
| 1522 | case 'B': components[i] = SwizzleComponent::UB; break; |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 1523 | default: |
| 1524 | this->error(offset, |
| 1525 | String::printf("invalid swizzle component '%c'", swizzleMask[i]).c_str()); |
Ethan Nicholas | be8f73d | 2021-08-28 19:50:03 -0400 | [diff] [blame] | 1526 | return {{DSLExpression::Poison()}}; |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 1527 | } |
| 1528 | } |
| 1529 | switch (length) { |
| 1530 | case 1: return dsl::Swizzle(std::move(base), components[0]); |
| 1531 | case 2: return dsl::Swizzle(std::move(base), components[0], components[1]); |
| 1532 | case 3: return dsl::Swizzle(std::move(base), components[0], components[1], components[2]); |
| 1533 | case 4: return dsl::Swizzle(std::move(base), components[0], components[1], components[2], |
| 1534 | components[3]); |
| 1535 | default: SkUNREACHABLE; |
| 1536 | } |
| 1537 | } |
| 1538 | |
| 1539 | skstd::optional<dsl::Wrapper<dsl::DSLExpression>> DSLParser::call(int offset, |
| 1540 | dsl::DSLExpression base, SkTArray<Wrapper<DSLExpression>> args) { |
Ethan Nicholas | 6f20b8d | 2021-08-31 07:40:24 -0400 | [diff] [blame] | 1541 | return {{DSLExpression(base(std::move(args), this->position(offset)), this->position(offset))}}; |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 1542 | } |
| 1543 | |
| 1544 | /* LBRACKET expression? RBRACKET | DOT IDENTIFIER | LPAREN arguments RPAREN | |
| 1545 | PLUSPLUS | MINUSMINUS | COLONCOLON IDENTIFIER | FLOAT_LITERAL [IDENTIFIER] */ |
| 1546 | skstd::optional<DSLWrapper<DSLExpression>> DSLParser::suffix(DSLExpression base) { |
| 1547 | Token next = this->nextToken(); |
| 1548 | AutoDSLDepth depth(this); |
| 1549 | if (!depth.increase()) { |
| 1550 | return skstd::nullopt; |
| 1551 | } |
| 1552 | switch (next.fKind) { |
| 1553 | case Token::Kind::TK_LBRACKET: { |
Ethan Nicholas | 6f20b8d | 2021-08-31 07:40:24 -0400 | [diff] [blame] | 1554 | if (this->checkNext(Token::Kind::TK_RBRACKET)) { |
| 1555 | this->error(next, "missing index in '[]'"); |
| 1556 | return {{DSLExpression::Poison()}}; |
| 1557 | } |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 1558 | skstd::optional<DSLWrapper<DSLExpression>> index = this->expression(); |
| 1559 | if (!index) { |
| 1560 | return skstd::nullopt; |
| 1561 | } |
| 1562 | this->expect(Token::Kind::TK_RBRACKET, "']' to complete array access expression"); |
| 1563 | DSLPossibleExpression result = base[std::move(**index)]; |
Ethan Nicholas | 6f20b8d | 2021-08-31 07:40:24 -0400 | [diff] [blame] | 1564 | if (!result.valid()) { |
| 1565 | result.reportErrors(this->position(next)); |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 1566 | } |
Ethan Nicholas | 6f20b8d | 2021-08-31 07:40:24 -0400 | [diff] [blame] | 1567 | return {{std::move(result)}}; |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 1568 | } |
| 1569 | case Token::Kind::TK_DOT: { |
| 1570 | int offset = this->peek().fOffset; |
| 1571 | skstd::string_view text; |
| 1572 | if (this->identifier(&text)) { |
| 1573 | return this->swizzle(offset, std::move(base), text); |
| 1574 | } |
| 1575 | [[fallthrough]]; |
| 1576 | } |
| 1577 | case Token::Kind::TK_FLOAT_LITERAL: { |
| 1578 | // Swizzles that start with a constant number, e.g. '.000r', will be tokenized as |
| 1579 | // floating point literals, possibly followed by an identifier. Handle that here. |
| 1580 | skstd::string_view field = this->text(next); |
| 1581 | SkASSERT(field[0] == '.'); |
| 1582 | field.remove_prefix(1); |
| 1583 | // use the next *raw* token so we don't ignore whitespace - we only care about |
| 1584 | // identifiers that directly follow the float |
| 1585 | Token id = this->nextRawToken(); |
| 1586 | if (id.fKind == Token::Kind::TK_IDENTIFIER) { |
| 1587 | return this->swizzle(next.fOffset, std::move(base), field + this->text(id)); |
| 1588 | } |
| 1589 | this->pushback(id); |
| 1590 | return this->swizzle(next.fOffset, std::move(base), field); |
| 1591 | } |
| 1592 | case Token::Kind::TK_LPAREN: { |
| 1593 | SkTArray<Wrapper<DSLExpression>> args; |
| 1594 | if (this->peek().fKind != Token::Kind::TK_RPAREN) { |
| 1595 | for (;;) { |
| 1596 | skstd::optional<DSLWrapper<DSLExpression>> expr = this->assignmentExpression(); |
| 1597 | if (!expr) { |
| 1598 | return skstd::nullopt; |
| 1599 | } |
| 1600 | args.push_back(std::move(*expr)); |
| 1601 | if (!this->checkNext(Token::Kind::TK_COMMA)) { |
| 1602 | break; |
| 1603 | } |
| 1604 | } |
| 1605 | } |
| 1606 | this->expect(Token::Kind::TK_RPAREN, "')' to complete function arguments"); |
| 1607 | return this->call(next.fOffset, std::move(base), std::move(args)); |
| 1608 | } |
| 1609 | case Token::Kind::TK_PLUSPLUS: |
| 1610 | return {{std::move(base)++}}; |
| 1611 | case Token::Kind::TK_MINUSMINUS: { |
| 1612 | return {{std::move(base)--}}; |
| 1613 | } |
| 1614 | default: { |
| 1615 | this->error(next, "expected expression suffix, but found '" + this->text(next) + "'"); |
| 1616 | return skstd::nullopt; |
| 1617 | } |
| 1618 | } |
| 1619 | } |
| 1620 | |
| 1621 | /* IDENTIFIER | intLiteral | floatLiteral | boolLiteral | '(' expression ')' */ |
| 1622 | skstd::optional<DSLWrapper<DSLExpression>> DSLParser::term() { |
| 1623 | Token t = this->peek(); |
| 1624 | switch (t.fKind) { |
| 1625 | case Token::Kind::TK_IDENTIFIER: { |
| 1626 | skstd::string_view text; |
| 1627 | if (this->identifier(&text)) { |
Ethan Nicholas | 6f20b8d | 2021-08-31 07:40:24 -0400 | [diff] [blame] | 1628 | return dsl::Symbol(text, this->position(t)); |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 1629 | } |
| 1630 | break; |
| 1631 | } |
| 1632 | case Token::Kind::TK_INT_LITERAL: { |
| 1633 | SKSL_INT i; |
Ethan Nicholas | 0459a93 | 2021-09-01 14:54:44 -0400 | [diff] [blame] | 1634 | if (!this->intLiteral(&i)) { |
| 1635 | i = 0; |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 1636 | } |
Ethan Nicholas | 0459a93 | 2021-09-01 14:54:44 -0400 | [diff] [blame] | 1637 | return {{DSLExpression(i, this->position(t))}}; |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 1638 | } |
| 1639 | case Token::Kind::TK_FLOAT_LITERAL: { |
| 1640 | SKSL_FLOAT f; |
Ethan Nicholas | 0459a93 | 2021-09-01 14:54:44 -0400 | [diff] [blame] | 1641 | if (!this->floatLiteral(&f)) { |
| 1642 | f = 0.0f; |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 1643 | } |
Ethan Nicholas | 0459a93 | 2021-09-01 14:54:44 -0400 | [diff] [blame] | 1644 | return {{DSLExpression(f, this->position(t))}}; |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 1645 | } |
| 1646 | case Token::Kind::TK_TRUE_LITERAL: // fall through |
| 1647 | case Token::Kind::TK_FALSE_LITERAL: { |
| 1648 | bool b; |
Ethan Nicholas | 0459a93 | 2021-09-01 14:54:44 -0400 | [diff] [blame] | 1649 | SkAssertResult(this->boolLiteral(&b)); |
| 1650 | return {{DSLExpression(b, this->position(t))}}; |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 1651 | } |
| 1652 | case Token::Kind::TK_LPAREN: { |
| 1653 | this->nextToken(); |
| 1654 | AutoDSLDepth depth(this); |
| 1655 | if (!depth.increase()) { |
| 1656 | return skstd::nullopt; |
| 1657 | } |
| 1658 | skstd::optional<DSLWrapper<DSLExpression>> result = this->expression(); |
| 1659 | if (result) { |
| 1660 | this->expect(Token::Kind::TK_RPAREN, "')' to complete expression"); |
| 1661 | return result; |
| 1662 | } |
| 1663 | break; |
| 1664 | } |
| 1665 | default: |
| 1666 | this->nextToken(); |
| 1667 | this->error(t.fOffset, "expected expression, but found '" + this->text(t) + "'"); |
Ethan Nicholas | ad284fe | 2021-09-01 10:17:48 -0400 | [diff] [blame] | 1668 | fEncounteredFatalError = true; |
Ethan Nicholas | dd2fdea | 2021-07-20 15:23:04 -0400 | [diff] [blame] | 1669 | } |
| 1670 | return skstd::nullopt; |
| 1671 | } |
| 1672 | |
| 1673 | /* INT_LITERAL */ |
| 1674 | bool DSLParser::intLiteral(SKSL_INT* dest) { |
| 1675 | Token t; |
| 1676 | if (!this->expect(Token::Kind::TK_INT_LITERAL, "integer literal", &t)) { |
| 1677 | return false; |
| 1678 | } |
| 1679 | skstd::string_view s = this->text(t); |
| 1680 | if (!SkSL::stoi(s, dest)) { |
| 1681 | this->error(t, "integer is too large: " + s); |
| 1682 | return false; |
| 1683 | } |
| 1684 | return true; |
| 1685 | } |
| 1686 | |
| 1687 | /* FLOAT_LITERAL */ |
| 1688 | bool DSLParser::floatLiteral(SKSL_FLOAT* dest) { |
| 1689 | Token t; |
| 1690 | if (!this->expect(Token::Kind::TK_FLOAT_LITERAL, "float literal", &t)) { |
| 1691 | return false; |
| 1692 | } |
| 1693 | skstd::string_view s = this->text(t); |
| 1694 | if (!SkSL::stod(s, dest)) { |
| 1695 | this->error(t, "floating-point value is too large: " + s); |
| 1696 | return false; |
| 1697 | } |
| 1698 | return true; |
| 1699 | } |
| 1700 | |
| 1701 | /* TRUE_LITERAL | FALSE_LITERAL */ |
| 1702 | bool DSLParser::boolLiteral(bool* dest) { |
| 1703 | Token t = this->nextToken(); |
| 1704 | switch (t.fKind) { |
| 1705 | case Token::Kind::TK_TRUE_LITERAL: |
| 1706 | *dest = true; |
| 1707 | return true; |
| 1708 | case Token::Kind::TK_FALSE_LITERAL: |
| 1709 | *dest = false; |
| 1710 | return true; |
| 1711 | default: |
| 1712 | this->error(t, "expected 'true' or 'false', but found '" + this->text(t) + "'"); |
| 1713 | return false; |
| 1714 | } |
| 1715 | } |
| 1716 | |
| 1717 | /* IDENTIFIER */ |
| 1718 | bool DSLParser::identifier(skstd::string_view* dest) { |
| 1719 | Token t; |
| 1720 | if (this->expect(Token::Kind::TK_IDENTIFIER, "identifier", &t)) { |
| 1721 | *dest = this->text(t); |
| 1722 | return true; |
| 1723 | } |
| 1724 | return false; |
| 1725 | } |
| 1726 | |
| 1727 | } // namespace SkSL |
| 1728 | |
| 1729 | #endif // SKSL_DSL_PARSER |