1 //===-- lib/Parser/Fortran-parsers.cpp ------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 // Top-level grammar specification for Fortran. These parsers drive 10 // the tokenization parsers in cooked-tokens.h to consume characters, 11 // recognize the productions of Fortran, and to construct a parse tree. 12 // See ParserCombinators.md for documentation on the parser combinator 13 // library used here to implement an LL recursive descent recognizer. 14 15 // The productions that follow are derived from the draft Fortran 2018 16 // standard, with some necessary modifications to remove left recursion 17 // and some generalization in order to defer cases where parses depend 18 // on the definitions of symbols. The "Rxxx" numbers that appear in 19 // comments refer to these numbered requirements in the Fortran standard. 20 21 // The whole Fortran grammar originally constituted one header file, 22 // but that turned out to require more memory to compile with current 23 // C++ compilers than some people were willing to accept, so now the 24 // various per-type parsers are partitioned into several C++ source 25 // files. This file contains parsers for constants, types, declarations, 26 // and misfits (mostly clauses 7, 8, & 9 of Fortran 2018). The others: 27 // executable-parsers.cpp Executable statements 28 // expr-parsers.cpp Expressions 29 // io-parsers.cpp I/O statements and FORMAT 30 // openmp-parsers.cpp OpenMP directives 31 // program-parsers.cpp Program units 32 33 #include "basic-parsers.h" 34 #include "expr-parsers.h" 35 #include "misc-parsers.h" 36 #include "stmt-parser.h" 37 #include "token-parsers.h" 38 #include "type-parser-implementation.h" 39 #include "flang/Parser/parse-tree.h" 40 #include "flang/Parser/user-state.h" 41 42 namespace Fortran::parser { 43 44 // R601 alphanumeric-character -> letter | digit | underscore 45 // R603 name -> letter [alphanumeric-character]... 46 constexpr auto nonDigitIdChar{letter || otherIdChar}; 47 constexpr auto rawName{nonDigitIdChar >> many(nonDigitIdChar || digit)}; 48 TYPE_PARSER(space >> sourced(rawName >> construct<Name>())) 49 50 // R608 intrinsic-operator -> 51 // power-op | mult-op | add-op | concat-op | rel-op | 52 // not-op | and-op | or-op | equiv-op 53 // R610 extended-intrinsic-op -> intrinsic-operator 54 // These parsers must be ordered carefully to avoid misrecognition. 55 constexpr auto namedIntrinsicOperator{ 56 ".LT." >> pure(DefinedOperator::IntrinsicOperator::LT) || 57 ".LE." >> pure(DefinedOperator::IntrinsicOperator::LE) || 58 ".EQ." >> pure(DefinedOperator::IntrinsicOperator::EQ) || 59 ".NE." >> pure(DefinedOperator::IntrinsicOperator::NE) || 60 ".GE." >> pure(DefinedOperator::IntrinsicOperator::GE) || 61 ".GT." >> pure(DefinedOperator::IntrinsicOperator::GT) || 62 ".NOT." >> pure(DefinedOperator::IntrinsicOperator::NOT) || 63 ".AND." >> pure(DefinedOperator::IntrinsicOperator::AND) || 64 ".OR." >> pure(DefinedOperator::IntrinsicOperator::OR) || 65 ".EQV." >> pure(DefinedOperator::IntrinsicOperator::EQV) || 66 ".NEQV." >> pure(DefinedOperator::IntrinsicOperator::NEQV) || 67 extension<LanguageFeature::XOROperator>( 68 ".XOR." >> pure(DefinedOperator::IntrinsicOperator::NEQV)) || 69 extension<LanguageFeature::LogicalAbbreviations>( 70 ".N." >> pure(DefinedOperator::IntrinsicOperator::NOT) || 71 ".A." >> pure(DefinedOperator::IntrinsicOperator::AND) || 72 ".O." >> pure(DefinedOperator::IntrinsicOperator::OR) || 73 extension<LanguageFeature::XOROperator>( 74 ".X." >> pure(DefinedOperator::IntrinsicOperator::NEQV)))}; 75 76 constexpr auto intrinsicOperator{ 77 "**" >> pure(DefinedOperator::IntrinsicOperator::Power) || 78 "*" >> pure(DefinedOperator::IntrinsicOperator::Multiply) || 79 "//" >> pure(DefinedOperator::IntrinsicOperator::Concat) || 80 "/=" >> pure(DefinedOperator::IntrinsicOperator::NE) || 81 "/" >> pure(DefinedOperator::IntrinsicOperator::Divide) || 82 "+" >> pure(DefinedOperator::IntrinsicOperator::Add) || 83 "-" >> pure(DefinedOperator::IntrinsicOperator::Subtract) || 84 "<=" >> pure(DefinedOperator::IntrinsicOperator::LE) || 85 extension<LanguageFeature::AlternativeNE>( 86 "<>" >> pure(DefinedOperator::IntrinsicOperator::NE)) || 87 "<" >> pure(DefinedOperator::IntrinsicOperator::LT) || 88 "==" >> pure(DefinedOperator::IntrinsicOperator::EQ) || 89 ">=" >> pure(DefinedOperator::IntrinsicOperator::GE) || 90 ">" >> pure(DefinedOperator::IntrinsicOperator::GT) || 91 namedIntrinsicOperator}; 92 93 // R609 defined-operator -> 94 // defined-unary-op | defined-binary-op | extended-intrinsic-op 95 TYPE_PARSER(construct<DefinedOperator>(intrinsicOperator) || 96 construct<DefinedOperator>(definedOpName)) 97 98 // R505 implicit-part -> [implicit-part-stmt]... implicit-stmt 99 // N.B. PARAMETER, FORMAT, & ENTRY statements that appear before any 100 // other kind of declaration-construct will be parsed into the 101 // implicit-part. 102 TYPE_CONTEXT_PARSER("implicit part"_en_US, 103 construct<ImplicitPart>(many(Parser<ImplicitPartStmt>{}))) 104 105 // R506 implicit-part-stmt -> 106 // implicit-stmt | parameter-stmt | format-stmt | entry-stmt 107 TYPE_PARSER(first( 108 construct<ImplicitPartStmt>(statement(indirect(Parser<ImplicitStmt>{}))), 109 construct<ImplicitPartStmt>(statement(indirect(parameterStmt))), 110 construct<ImplicitPartStmt>(statement(indirect(oldParameterStmt))), 111 construct<ImplicitPartStmt>(statement(indirect(formatStmt))), 112 construct<ImplicitPartStmt>(statement(indirect(entryStmt))), 113 construct<ImplicitPartStmt>(indirect(compilerDirective)))) 114 115 // R512 internal-subprogram -> function-subprogram | subroutine-subprogram 116 // Internal subprograms are not program units, so their END statements 117 // can be followed by ';' and another statement on the same line. 118 TYPE_CONTEXT_PARSER("internal subprogram"_en_US, 119 (construct<InternalSubprogram>(indirect(functionSubprogram)) || 120 construct<InternalSubprogram>(indirect(subroutineSubprogram))) / 121 forceEndOfStmt) 122 123 // R511 internal-subprogram-part -> contains-stmt [internal-subprogram]... 124 TYPE_CONTEXT_PARSER("internal subprogram part"_en_US, 125 construct<InternalSubprogramPart>(statement(containsStmt), 126 many(StartNewSubprogram{} >> Parser<InternalSubprogram>{}))) 127 128 // R605 literal-constant -> 129 // int-literal-constant | real-literal-constant | 130 // complex-literal-constant | logical-literal-constant | 131 // char-literal-constant | boz-literal-constant 132 TYPE_PARSER( 133 first(construct<LiteralConstant>(Parser<HollerithLiteralConstant>{}), 134 construct<LiteralConstant>(realLiteralConstant), 135 construct<LiteralConstant>(intLiteralConstant), 136 construct<LiteralConstant>(Parser<ComplexLiteralConstant>{}), 137 construct<LiteralConstant>(Parser<BOZLiteralConstant>{}), 138 construct<LiteralConstant>(charLiteralConstant), 139 construct<LiteralConstant>(Parser<LogicalLiteralConstant>{}))) 140 141 // R606 named-constant -> name 142 TYPE_PARSER(construct<NamedConstant>(name)) 143 144 // R701 type-param-value -> scalar-int-expr | * | : 145 TYPE_PARSER(construct<TypeParamValue>(scalarIntExpr) || 146 construct<TypeParamValue>(star) || 147 construct<TypeParamValue>(construct<TypeParamValue::Deferred>(":"_tok))) 148 149 // R702 type-spec -> intrinsic-type-spec | derived-type-spec 150 // N.B. This type-spec production is one of two instances in the Fortran 151 // grammar where intrinsic types and bare derived type names can clash; 152 // the other is below in R703 declaration-type-spec. Look-ahead is required 153 // to disambiguate the cases where a derived type name begins with the name 154 // of an intrinsic type, e.g., REALITY. 155 TYPE_CONTEXT_PARSER("type spec"_en_US, 156 construct<TypeSpec>(intrinsicTypeSpec / lookAhead("::"_tok || ")"_tok)) || 157 construct<TypeSpec>(derivedTypeSpec)) 158 159 // R703 declaration-type-spec -> 160 // intrinsic-type-spec | TYPE ( intrinsic-type-spec ) | 161 // TYPE ( derived-type-spec ) | CLASS ( derived-type-spec ) | 162 // CLASS ( * ) | TYPE ( * ) 163 // N.B. It is critical to distribute "parenthesized()" over the alternatives 164 // for TYPE (...), rather than putting the alternatives within it, which 165 // would fail on "TYPE(real_derived)" with a misrecognition of "real" as an 166 // intrinsic-type-spec. 167 TYPE_CONTEXT_PARSER("declaration type spec"_en_US, 168 construct<DeclarationTypeSpec>(intrinsicTypeSpec) || 169 "TYPE" >> 170 (parenthesized(construct<DeclarationTypeSpec>(intrinsicTypeSpec)) || 171 parenthesized(construct<DeclarationTypeSpec>( 172 construct<DeclarationTypeSpec::Type>(derivedTypeSpec))) || 173 construct<DeclarationTypeSpec>( 174 "( * )" >> construct<DeclarationTypeSpec::TypeStar>())) || 175 "CLASS" >> parenthesized(construct<DeclarationTypeSpec>( 176 construct<DeclarationTypeSpec::Class>( 177 derivedTypeSpec)) || 178 construct<DeclarationTypeSpec>("*" >> 179 construct<DeclarationTypeSpec::ClassStar>())) || 180 extension<LanguageFeature::DECStructures>( 181 construct<DeclarationTypeSpec>( 182 // As is also done for the STRUCTURE statement, the name of 183 // the structure includes the surrounding slashes to avoid 184 // name clashes. 185 construct<DeclarationTypeSpec::Record>( 186 "RECORD" >> sourced("/" >> name / "/"))))) 187 188 // R704 intrinsic-type-spec -> 189 // integer-type-spec | REAL [kind-selector] | DOUBLE PRECISION | 190 // COMPLEX [kind-selector] | CHARACTER [char-selector] | 191 // LOGICAL [kind-selector] 192 // Extensions: DOUBLE COMPLEX, BYTE 193 TYPE_CONTEXT_PARSER("intrinsic type spec"_en_US, 194 first(construct<IntrinsicTypeSpec>(integerTypeSpec), 195 construct<IntrinsicTypeSpec>( 196 construct<IntrinsicTypeSpec::Real>("REAL" >> maybe(kindSelector))), 197 construct<IntrinsicTypeSpec>("DOUBLE PRECISION" >> 198 construct<IntrinsicTypeSpec::DoublePrecision>()), 199 construct<IntrinsicTypeSpec>(construct<IntrinsicTypeSpec::Complex>( 200 "COMPLEX" >> maybe(kindSelector))), 201 construct<IntrinsicTypeSpec>(construct<IntrinsicTypeSpec::Character>( 202 "CHARACTER" >> maybe(Parser<CharSelector>{}))), 203 construct<IntrinsicTypeSpec>(construct<IntrinsicTypeSpec::Logical>( 204 "LOGICAL" >> maybe(kindSelector))), 205 extension<LanguageFeature::DoubleComplex>(construct<IntrinsicTypeSpec>( 206 "DOUBLE COMPLEX" >> construct<IntrinsicTypeSpec::DoubleComplex>())), 207 extension<LanguageFeature::Byte>( 208 construct<IntrinsicTypeSpec>(construct<IntegerTypeSpec>( 209 "BYTE" >> construct<std::optional<KindSelector>>(pure(1))))))) 210 211 // R705 integer-type-spec -> INTEGER [kind-selector] 212 TYPE_PARSER(construct<IntegerTypeSpec>("INTEGER" >> maybe(kindSelector))) 213 214 // R706 kind-selector -> ( [KIND =] scalar-int-constant-expr ) 215 // Legacy extension: kind-selector -> * digit-string 216 TYPE_PARSER(construct<KindSelector>( 217 parenthesized(maybe("KIND ="_tok) >> scalarIntConstantExpr)) || 218 extension<LanguageFeature::StarKind>(construct<KindSelector>( 219 construct<KindSelector::StarSize>("*" >> digitString64 / spaceCheck)))) 220 221 // R707 signed-int-literal-constant -> [sign] int-literal-constant 222 TYPE_PARSER(sourced(construct<SignedIntLiteralConstant>( 223 SignedIntLiteralConstantWithoutKind{}, maybe(underscore >> kindParam)))) 224 225 // R708 int-literal-constant -> digit-string [_ kind-param] 226 // The negated look-ahead for a trailing underscore prevents misrecognition 227 // when the digit string is a numeric kind parameter of a character literal. 228 TYPE_PARSER(construct<IntLiteralConstant>( 229 space >> digitString, maybe(underscore >> kindParam) / !underscore)) 230 231 // R709 kind-param -> digit-string | scalar-int-constant-name 232 TYPE_PARSER(construct<KindParam>(digitString64) || 233 construct<KindParam>(scalar(integer(constant(name))))) 234 235 // R712 sign -> + | - 236 // N.B. A sign constitutes a whole token, so a space is allowed in free form 237 // after the sign and before a real-literal-constant or 238 // complex-literal-constant. A sign is not a unary operator in these contexts. 239 constexpr auto sign{ 240 "+"_tok >> pure(Sign::Positive) || "-"_tok >> pure(Sign::Negative)}; 241 242 // R713 signed-real-literal-constant -> [sign] real-literal-constant 243 constexpr auto signedRealLiteralConstant{ 244 construct<SignedRealLiteralConstant>(maybe(sign), realLiteralConstant)}; 245 246 // R714 real-literal-constant -> 247 // significand [exponent-letter exponent] [_ kind-param] | 248 // digit-string exponent-letter exponent [_ kind-param] 249 // R715 significand -> digit-string . [digit-string] | . digit-string 250 // R716 exponent-letter -> E | D 251 // Extension: Q 252 // R717 exponent -> signed-digit-string 253 constexpr auto exponentPart{ 254 ("ed"_ch || extension<LanguageFeature::QuadPrecision>("q"_ch)) >> 255 SignedDigitString{}}; 256 257 TYPE_CONTEXT_PARSER("REAL literal constant"_en_US, 258 space >> 259 construct<RealLiteralConstant>( 260 sourced((digitString >> "."_ch >> 261 !(some(letter) >> 262 "."_ch /* don't misinterpret 1.AND. */) >> 263 maybe(digitString) >> maybe(exponentPart) >> ok || 264 "."_ch >> digitString >> maybe(exponentPart) >> ok || 265 digitString >> exponentPart >> ok) >> 266 construct<RealLiteralConstant::Real>()), 267 maybe(underscore >> kindParam))) 268 269 // R718 complex-literal-constant -> ( real-part , imag-part ) 270 TYPE_CONTEXT_PARSER("COMPLEX literal constant"_en_US, 271 parenthesized(construct<ComplexLiteralConstant>( 272 Parser<ComplexPart>{} / ",", Parser<ComplexPart>{}))) 273 274 // PGI/Intel extension: signed complex literal constant 275 TYPE_PARSER(construct<SignedComplexLiteralConstant>( 276 sign, Parser<ComplexLiteralConstant>{})) 277 278 // R719 real-part -> 279 // signed-int-literal-constant | signed-real-literal-constant | 280 // named-constant 281 // R720 imag-part -> 282 // signed-int-literal-constant | signed-real-literal-constant | 283 // named-constant 284 TYPE_PARSER(construct<ComplexPart>(signedRealLiteralConstant) || 285 construct<ComplexPart>(signedIntLiteralConstant) || 286 construct<ComplexPart>(namedConstant)) 287 288 // R721 char-selector -> 289 // length-selector | 290 // ( LEN = type-param-value , KIND = scalar-int-constant-expr ) | 291 // ( type-param-value , [KIND =] scalar-int-constant-expr ) | 292 // ( KIND = scalar-int-constant-expr [, LEN = type-param-value] ) 293 TYPE_PARSER(construct<CharSelector>(Parser<LengthSelector>{}) || 294 parenthesized(construct<CharSelector>( 295 "LEN =" >> typeParamValue, ", KIND =" >> scalarIntConstantExpr)) || 296 parenthesized(construct<CharSelector>( 297 typeParamValue / ",", maybe("KIND ="_tok) >> scalarIntConstantExpr)) || 298 parenthesized(construct<CharSelector>( 299 "KIND =" >> scalarIntConstantExpr, maybe(", LEN =" >> typeParamValue)))) 300 301 // R722 length-selector -> ( [LEN =] type-param-value ) | * char-length [,] 302 // N.B. The trailing [,] in the production is permitted by the Standard 303 // only in the context of a type-declaration-stmt, but even with that 304 // limitation, it would seem to be unnecessary and buggy to consume the comma 305 // here. 306 TYPE_PARSER(construct<LengthSelector>( 307 parenthesized(maybe("LEN ="_tok) >> typeParamValue)) || 308 construct<LengthSelector>("*" >> charLength /* / maybe(","_tok) */)) 309 310 // R723 char-length -> ( type-param-value ) | digit-string 311 TYPE_PARSER(construct<CharLength>(parenthesized(typeParamValue)) || 312 construct<CharLength>(space >> digitString64 / spaceCheck)) 313 314 // R724 char-literal-constant -> 315 // [kind-param _] ' [rep-char]... ' | 316 // [kind-param _] " [rep-char]... " 317 // "rep-char" is any non-control character. Doubled interior quotes are 318 // combined. Backslash escapes can be enabled. 319 // N.B. the parsing of "kind-param" takes care to not consume the '_'. 320 TYPE_CONTEXT_PARSER("CHARACTER literal constant"_en_US, 321 construct<CharLiteralConstant>( 322 kindParam / underscore, charLiteralConstantWithoutKind) || 323 construct<CharLiteralConstant>(construct<std::optional<KindParam>>(), 324 space >> charLiteralConstantWithoutKind)) 325 326 TYPE_CONTEXT_PARSER( 327 "Hollerith"_en_US, construct<HollerithLiteralConstant>(rawHollerithLiteral)) 328 329 // R725 logical-literal-constant -> 330 // .TRUE. [_ kind-param] | .FALSE. [_ kind-param] 331 // Also accept .T. and .F. as extensions. 332 TYPE_PARSER(construct<LogicalLiteralConstant>( 333 logicalTRUE, maybe(underscore >> kindParam)) || 334 construct<LogicalLiteralConstant>( 335 logicalFALSE, maybe(underscore >> kindParam))) 336 337 // R726 derived-type-def -> 338 // derived-type-stmt [type-param-def-stmt]... 339 // [private-or-sequence]... [component-part] 340 // [type-bound-procedure-part] end-type-stmt 341 // R735 component-part -> [component-def-stmt]... 342 TYPE_CONTEXT_PARSER("derived type definition"_en_US, 343 construct<DerivedTypeDef>(statement(Parser<DerivedTypeStmt>{}), 344 many(unambiguousStatement(Parser<TypeParamDefStmt>{})), 345 many(statement(Parser<PrivateOrSequence>{})), 346 many(inContext("component"_en_US, 347 unambiguousStatement(Parser<ComponentDefStmt>{}))), 348 maybe(Parser<TypeBoundProcedurePart>{}), 349 statement(Parser<EndTypeStmt>{}))) 350 351 // R727 derived-type-stmt -> 352 // TYPE [[, type-attr-spec-list] ::] type-name [( 353 // type-param-name-list )] 354 TYPE_CONTEXT_PARSER("TYPE statement"_en_US, 355 construct<DerivedTypeStmt>( 356 "TYPE" >> optionalListBeforeColons(Parser<TypeAttrSpec>{}), name, 357 defaulted(parenthesized(nonemptyList(name))))) 358 359 // R728 type-attr-spec -> 360 // ABSTRACT | access-spec | BIND(C) | EXTENDS ( parent-type-name ) 361 TYPE_PARSER(construct<TypeAttrSpec>(construct<Abstract>("ABSTRACT"_tok)) || 362 construct<TypeAttrSpec>(construct<TypeAttrSpec::BindC>("BIND ( C )"_tok)) || 363 construct<TypeAttrSpec>( 364 construct<TypeAttrSpec::Extends>("EXTENDS" >> parenthesized(name))) || 365 construct<TypeAttrSpec>(accessSpec)) 366 367 // R729 private-or-sequence -> private-components-stmt | sequence-stmt 368 TYPE_PARSER(construct<PrivateOrSequence>(Parser<PrivateStmt>{}) || 369 construct<PrivateOrSequence>(Parser<SequenceStmt>{})) 370 371 // R730 end-type-stmt -> END TYPE [type-name] 372 TYPE_PARSER(construct<EndTypeStmt>( 373 recovery("END TYPE" >> maybe(name), endStmtErrorRecovery))) 374 375 // R731 sequence-stmt -> SEQUENCE 376 TYPE_PARSER(construct<SequenceStmt>("SEQUENCE"_tok)) 377 378 // R732 type-param-def-stmt -> 379 // integer-type-spec , type-param-attr-spec :: type-param-decl-list 380 // R734 type-param-attr-spec -> KIND | LEN 381 constexpr auto kindOrLen{"KIND" >> pure(common::TypeParamAttr::Kind) || 382 "LEN" >> pure(common::TypeParamAttr::Len)}; 383 TYPE_PARSER(construct<TypeParamDefStmt>(integerTypeSpec / ",", kindOrLen, 384 "::" >> nonemptyList("expected type parameter declarations"_err_en_US, 385 Parser<TypeParamDecl>{}))) 386 387 // R733 type-param-decl -> type-param-name [= scalar-int-constant-expr] 388 TYPE_PARSER(construct<TypeParamDecl>(name, maybe("=" >> scalarIntConstantExpr))) 389 390 // R736 component-def-stmt -> data-component-def-stmt | 391 // proc-component-def-stmt 392 // Accidental extension not enabled here: PGI accepts type-param-def-stmt in 393 // component-part of derived-type-def. 394 TYPE_PARSER(recovery( 395 withMessage("expected component definition"_err_en_US, 396 first(construct<ComponentDefStmt>(Parser<DataComponentDefStmt>{}), 397 construct<ComponentDefStmt>(Parser<ProcComponentDefStmt>{}))), 398 construct<ComponentDefStmt>(inStmtErrorRecovery))) 399 400 // R737 data-component-def-stmt -> 401 // declaration-type-spec [[, component-attr-spec-list] ::] 402 // component-decl-list 403 // N.B. The standard requires double colons if there's an initializer. 404 TYPE_PARSER(construct<DataComponentDefStmt>(declarationTypeSpec, 405 optionalListBeforeColons(Parser<ComponentAttrSpec>{}), 406 nonemptyList("expected component declarations"_err_en_US, 407 Parser<ComponentOrFill>{}))) 408 409 // R738 component-attr-spec -> 410 // access-spec | ALLOCATABLE | 411 // CODIMENSION lbracket coarray-spec rbracket | 412 // CONTIGUOUS | DIMENSION ( component-array-spec ) | POINTER 413 TYPE_PARSER(construct<ComponentAttrSpec>(accessSpec) || 414 construct<ComponentAttrSpec>(allocatable) || 415 construct<ComponentAttrSpec>("CODIMENSION" >> coarraySpec) || 416 construct<ComponentAttrSpec>(contiguous) || 417 construct<ComponentAttrSpec>("DIMENSION" >> Parser<ComponentArraySpec>{}) || 418 construct<ComponentAttrSpec>(pointer) || 419 construct<ComponentAttrSpec>(recovery( 420 fail<ErrorRecovery>( 421 "type parameter definitions must appear before component declarations"_err_en_US), 422 kindOrLen >> construct<ErrorRecovery>()))) 423 424 // R739 component-decl -> 425 // component-name [( component-array-spec )] 426 // [lbracket coarray-spec rbracket] [* char-length] 427 // [component-initialization] 428 TYPE_CONTEXT_PARSER("component declaration"_en_US, 429 construct<ComponentDecl>(name, maybe(Parser<ComponentArraySpec>{}), 430 maybe(coarraySpec), maybe("*" >> charLength), maybe(initialization))) 431 // The source field of the Name will be replaced with a distinct generated name. 432 TYPE_CONTEXT_PARSER("%FILL item"_en_US, 433 extension<LanguageFeature::DECStructures>( 434 construct<FillDecl>(space >> sourced("%FILL" >> construct<Name>()), 435 maybe(Parser<ComponentArraySpec>{}), maybe("*" >> charLength)))) 436 TYPE_PARSER(construct<ComponentOrFill>(Parser<ComponentDecl>{}) || 437 construct<ComponentOrFill>(Parser<FillDecl>{})) 438 439 // R740 component-array-spec -> 440 // explicit-shape-spec-list | deferred-shape-spec-list 441 // N.B. Parenthesized here rather than around references to this production. 442 TYPE_PARSER(construct<ComponentArraySpec>(parenthesized( 443 nonemptyList("expected explicit shape specifications"_err_en_US, 444 explicitShapeSpec))) || 445 construct<ComponentArraySpec>(parenthesized(deferredShapeSpecList))) 446 447 // R741 proc-component-def-stmt -> 448 // PROCEDURE ( [proc-interface] ) , proc-component-attr-spec-list 449 // :: proc-decl-list 450 TYPE_CONTEXT_PARSER("PROCEDURE component definition statement"_en_US, 451 construct<ProcComponentDefStmt>( 452 "PROCEDURE" >> parenthesized(maybe(procInterface)), 453 localRecovery("expected PROCEDURE component attributes"_err_en_US, 454 "," >> nonemptyList(Parser<ProcComponentAttrSpec>{}), ok), 455 localRecovery("expected PROCEDURE declarations"_err_en_US, 456 "::" >> nonemptyList(procDecl), SkipTo<'\n'>{}))) 457 458 // R742 proc-component-attr-spec -> 459 // access-spec | NOPASS | PASS [(arg-name)] | POINTER 460 constexpr auto noPass{construct<NoPass>("NOPASS"_tok)}; 461 constexpr auto pass{construct<Pass>("PASS" >> maybe(parenthesized(name)))}; 462 TYPE_PARSER(construct<ProcComponentAttrSpec>(accessSpec) || 463 construct<ProcComponentAttrSpec>(noPass) || 464 construct<ProcComponentAttrSpec>(pass) || 465 construct<ProcComponentAttrSpec>(pointer)) 466 467 // R744 initial-data-target -> designator 468 constexpr auto initialDataTarget{indirect(designator)}; 469 470 // R743 component-initialization -> 471 // = constant-expr | => null-init | => initial-data-target 472 // R805 initialization -> 473 // = constant-expr | => null-init | => initial-data-target 474 // Universal extension: initialization -> / data-stmt-value-list / 475 TYPE_PARSER(construct<Initialization>("=>" >> nullInit) || 476 construct<Initialization>("=>" >> initialDataTarget) || 477 construct<Initialization>("=" >> constantExpr) || 478 extension<LanguageFeature::SlashInitialization>(construct<Initialization>( 479 "/" >> nonemptyList("expected values"_err_en_US, 480 indirect(Parser<DataStmtValue>{})) / 481 "/"))) 482 483 // R745 private-components-stmt -> PRIVATE 484 // R747 binding-private-stmt -> PRIVATE 485 TYPE_PARSER(construct<PrivateStmt>("PRIVATE"_tok)) 486 487 // R746 type-bound-procedure-part -> 488 // contains-stmt [binding-private-stmt] [type-bound-proc-binding]... 489 TYPE_CONTEXT_PARSER("type bound procedure part"_en_US, 490 construct<TypeBoundProcedurePart>(statement(containsStmt), 491 maybe(statement(Parser<PrivateStmt>{})), 492 many(statement(Parser<TypeBoundProcBinding>{})))) 493 494 // R748 type-bound-proc-binding -> 495 // type-bound-procedure-stmt | type-bound-generic-stmt | 496 // final-procedure-stmt 497 TYPE_CONTEXT_PARSER("type bound procedure binding"_en_US, 498 recovery( 499 first(construct<TypeBoundProcBinding>(Parser<TypeBoundProcedureStmt>{}), 500 construct<TypeBoundProcBinding>(Parser<TypeBoundGenericStmt>{}), 501 construct<TypeBoundProcBinding>(Parser<FinalProcedureStmt>{})), 502 construct<TypeBoundProcBinding>( 503 !"END"_tok >> SkipTo<'\n'>{} >> construct<ErrorRecovery>()))) 504 505 // R749 type-bound-procedure-stmt -> 506 // PROCEDURE [[, bind-attr-list] ::] type-bound-proc-decl-list | 507 // PROCEDURE ( interface-name ) , bind-attr-list :: binding-name-list 508 TYPE_CONTEXT_PARSER("type bound PROCEDURE statement"_en_US, 509 "PROCEDURE" >> 510 (construct<TypeBoundProcedureStmt>( 511 construct<TypeBoundProcedureStmt::WithInterface>( 512 parenthesized(name), 513 localRecovery("expected list of binding attributes"_err_en_US, 514 "," >> nonemptyList(Parser<BindAttr>{}), ok), 515 localRecovery("expected list of binding names"_err_en_US, 516 "::" >> listOfNames, SkipTo<'\n'>{}))) || 517 construct<TypeBoundProcedureStmt>( 518 construct<TypeBoundProcedureStmt::WithoutInterface>( 519 optionalListBeforeColons(Parser<BindAttr>{}), 520 nonemptyList( 521 "expected type bound procedure declarations"_err_en_US, 522 Parser<TypeBoundProcDecl>{}))))) 523 524 // R750 type-bound-proc-decl -> binding-name [=> procedure-name] 525 TYPE_PARSER(construct<TypeBoundProcDecl>(name, maybe("=>" >> name))) 526 527 // R751 type-bound-generic-stmt -> 528 // GENERIC [, access-spec] :: generic-spec => binding-name-list 529 TYPE_CONTEXT_PARSER("type bound GENERIC statement"_en_US, 530 construct<TypeBoundGenericStmt>("GENERIC" >> maybe("," >> accessSpec), 531 "::" >> indirect(genericSpec), "=>" >> listOfNames)) 532 533 // R752 bind-attr -> 534 // access-spec | DEFERRED | NON_OVERRIDABLE | NOPASS | PASS [(arg-name)] 535 TYPE_PARSER(construct<BindAttr>(accessSpec) || 536 construct<BindAttr>(construct<BindAttr::Deferred>("DEFERRED"_tok)) || 537 construct<BindAttr>( 538 construct<BindAttr::Non_Overridable>("NON_OVERRIDABLE"_tok)) || 539 construct<BindAttr>(noPass) || construct<BindAttr>(pass)) 540 541 // R753 final-procedure-stmt -> FINAL [::] final-subroutine-name-list 542 TYPE_CONTEXT_PARSER("FINAL statement"_en_US, 543 construct<FinalProcedureStmt>("FINAL" >> maybe("::"_tok) >> listOfNames)) 544 545 // R754 derived-type-spec -> type-name [(type-param-spec-list)] 546 TYPE_PARSER(construct<DerivedTypeSpec>(name, 547 defaulted(parenthesized(nonemptyList( 548 "expected type parameters"_err_en_US, Parser<TypeParamSpec>{}))))) 549 550 // R755 type-param-spec -> [keyword =] type-param-value 551 TYPE_PARSER(construct<TypeParamSpec>(maybe(keyword / "="), typeParamValue)) 552 553 // R756 structure-constructor -> derived-type-spec ( [component-spec-list] ) 554 TYPE_PARSER((construct<StructureConstructor>(derivedTypeSpec, 555 parenthesized(optionalList(Parser<ComponentSpec>{}))) || 556 // This alternative corrects misrecognition of the 557 // component-spec-list as the type-param-spec-list in 558 // derived-type-spec. 559 construct<StructureConstructor>( 560 construct<DerivedTypeSpec>( 561 name, construct<std::list<TypeParamSpec>>()), 562 parenthesized(optionalList(Parser<ComponentSpec>{})))) / 563 !"("_tok) 564 565 // R757 component-spec -> [keyword =] component-data-source 566 TYPE_PARSER(construct<ComponentSpec>( 567 maybe(keyword / "="), Parser<ComponentDataSource>{})) 568 569 // R758 component-data-source -> expr | data-target | proc-target 570 TYPE_PARSER(construct<ComponentDataSource>(indirect(expr))) 571 572 // R759 enum-def -> 573 // enum-def-stmt enumerator-def-stmt [enumerator-def-stmt]... 574 // end-enum-stmt 575 TYPE_CONTEXT_PARSER("enum definition"_en_US, 576 construct<EnumDef>(statement(Parser<EnumDefStmt>{}), 577 some(unambiguousStatement(Parser<EnumeratorDefStmt>{})), 578 statement(Parser<EndEnumStmt>{}))) 579 580 // R760 enum-def-stmt -> ENUM, BIND(C) 581 TYPE_PARSER(construct<EnumDefStmt>("ENUM , BIND ( C )"_tok)) 582 583 // R761 enumerator-def-stmt -> ENUMERATOR [::] enumerator-list 584 TYPE_CONTEXT_PARSER("ENUMERATOR statement"_en_US, 585 construct<EnumeratorDefStmt>("ENUMERATOR" >> maybe("::"_tok) >> 586 nonemptyList("expected enumerators"_err_en_US, Parser<Enumerator>{}))) 587 588 // R762 enumerator -> named-constant [= scalar-int-constant-expr] 589 TYPE_PARSER( 590 construct<Enumerator>(namedConstant, maybe("=" >> scalarIntConstantExpr))) 591 592 // R763 end-enum-stmt -> END ENUM 593 TYPE_PARSER(recovery("END ENUM"_tok, "END" >> SkipPast<'\n'>{}) >> 594 construct<EndEnumStmt>()) 595 596 // R801 type-declaration-stmt -> 597 // declaration-type-spec [[, attr-spec]... ::] entity-decl-list 598 constexpr auto entityDeclWithoutEqInit{construct<EntityDecl>(name, 599 maybe(arraySpec), maybe(coarraySpec), maybe("*" >> charLength), 600 !"="_tok >> maybe(initialization))}; // old-style REAL A/0/ still works 601 TYPE_PARSER( 602 construct<TypeDeclarationStmt>(declarationTypeSpec, 603 defaulted("," >> nonemptyList(Parser<AttrSpec>{})) / "::", 604 nonemptyList("expected entity declarations"_err_en_US, entityDecl)) || 605 // C806: no initializers allowed without colons ("REALA=1" is ambiguous) 606 construct<TypeDeclarationStmt>(declarationTypeSpec, 607 construct<std::list<AttrSpec>>(), 608 nonemptyList("expected entity declarations"_err_en_US, 609 entityDeclWithoutEqInit)) || 610 // PGI-only extension: comma in place of doubled colons 611 extension<LanguageFeature::MissingColons>(construct<TypeDeclarationStmt>( 612 declarationTypeSpec, defaulted("," >> nonemptyList(Parser<AttrSpec>{})), 613 withMessage("expected entity declarations"_err_en_US, 614 "," >> nonemptyList(entityDecl))))) 615 616 // R802 attr-spec -> 617 // access-spec | ALLOCATABLE | ASYNCHRONOUS | 618 // CODIMENSION lbracket coarray-spec rbracket | CONTIGUOUS | 619 // DIMENSION ( array-spec ) | EXTERNAL | INTENT ( intent-spec ) | 620 // INTRINSIC | language-binding-spec | OPTIONAL | PARAMETER | POINTER | 621 // PROTECTED | SAVE | TARGET | VALUE | VOLATILE 622 TYPE_PARSER(construct<AttrSpec>(accessSpec) || 623 construct<AttrSpec>(allocatable) || 624 construct<AttrSpec>(construct<Asynchronous>("ASYNCHRONOUS"_tok)) || 625 construct<AttrSpec>("CODIMENSION" >> coarraySpec) || 626 construct<AttrSpec>(contiguous) || 627 construct<AttrSpec>("DIMENSION" >> arraySpec) || 628 construct<AttrSpec>(construct<External>("EXTERNAL"_tok)) || 629 construct<AttrSpec>("INTENT" >> parenthesized(intentSpec)) || 630 construct<AttrSpec>(construct<Intrinsic>("INTRINSIC"_tok)) || 631 construct<AttrSpec>(languageBindingSpec) || construct<AttrSpec>(optional) || 632 construct<AttrSpec>(construct<Parameter>("PARAMETER"_tok)) || 633 construct<AttrSpec>(pointer) || construct<AttrSpec>(protectedAttr) || 634 construct<AttrSpec>(save) || 635 construct<AttrSpec>(construct<Target>("TARGET"_tok)) || 636 construct<AttrSpec>(construct<Value>("VALUE"_tok)) || 637 construct<AttrSpec>(construct<Volatile>("VOLATILE"_tok))) 638 639 // R804 object-name -> name 640 constexpr auto objectName{name}; 641 642 // R803 entity-decl -> 643 // object-name [( array-spec )] [lbracket coarray-spec rbracket] 644 // [* char-length] [initialization] | 645 // function-name [* char-length] 646 TYPE_PARSER(construct<EntityDecl>(objectName, maybe(arraySpec), 647 maybe(coarraySpec), maybe("*" >> charLength), maybe(initialization))) 648 649 // R806 null-init -> function-reference ... which must resolve to NULL() 650 TYPE_PARSER(lookAhead(name / "( )") >> construct<NullInit>(expr)) 651 652 // R807 access-spec -> PUBLIC | PRIVATE 653 TYPE_PARSER(construct<AccessSpec>("PUBLIC" >> pure(AccessSpec::Kind::Public)) || 654 construct<AccessSpec>("PRIVATE" >> pure(AccessSpec::Kind::Private))) 655 656 // R808 language-binding-spec -> 657 // BIND ( C [, NAME = scalar-default-char-constant-expr] ) 658 // R1528 proc-language-binding-spec -> language-binding-spec 659 TYPE_PARSER(construct<LanguageBindingSpec>( 660 "BIND ( C" >> maybe(", NAME =" >> scalarDefaultCharConstantExpr) / ")")) 661 662 // R809 coarray-spec -> deferred-coshape-spec-list | explicit-coshape-spec 663 // N.B. Bracketed here rather than around references, for consistency with 664 // array-spec. 665 TYPE_PARSER( 666 construct<CoarraySpec>(bracketed(Parser<DeferredCoshapeSpecList>{})) || 667 construct<CoarraySpec>(bracketed(Parser<ExplicitCoshapeSpec>{}))) 668 669 // R810 deferred-coshape-spec -> : 670 // deferred-coshape-spec-list - just a list of colons 671 inline int listLength(std::list<Success> &&xs) { return xs.size(); } 672 673 TYPE_PARSER(construct<DeferredCoshapeSpecList>( 674 applyFunction(listLength, nonemptyList(":"_tok)))) 675 676 // R811 explicit-coshape-spec -> 677 // [[lower-cobound :] upper-cobound ,]... [lower-cobound :] * 678 // R812 lower-cobound -> specification-expr 679 // R813 upper-cobound -> specification-expr 680 TYPE_PARSER(construct<ExplicitCoshapeSpec>( 681 many(explicitShapeSpec / ","), maybe(specificationExpr / ":") / "*")) 682 683 // R815 array-spec -> 684 // explicit-shape-spec-list | assumed-shape-spec-list | 685 // deferred-shape-spec-list | assumed-size-spec | implied-shape-spec | 686 // implied-shape-or-assumed-size-spec | assumed-rank-spec 687 // N.B. Parenthesized here rather than around references to avoid 688 // a need for forced look-ahead. 689 // Shape specs that could be deferred-shape-spec or assumed-shape-spec 690 // (e.g. '(:,:)') are parsed as the former. 691 TYPE_PARSER( 692 construct<ArraySpec>(parenthesized(nonemptyList(explicitShapeSpec))) || 693 construct<ArraySpec>(parenthesized(deferredShapeSpecList)) || 694 construct<ArraySpec>( 695 parenthesized(nonemptyList(Parser<AssumedShapeSpec>{}))) || 696 construct<ArraySpec>(parenthesized(Parser<AssumedSizeSpec>{})) || 697 construct<ArraySpec>(parenthesized(Parser<ImpliedShapeSpec>{})) || 698 construct<ArraySpec>(parenthesized(Parser<AssumedRankSpec>{}))) 699 700 // R816 explicit-shape-spec -> [lower-bound :] upper-bound 701 // R817 lower-bound -> specification-expr 702 // R818 upper-bound -> specification-expr 703 TYPE_PARSER(construct<ExplicitShapeSpec>( 704 maybe(specificationExpr / ":"), specificationExpr)) 705 706 // R819 assumed-shape-spec -> [lower-bound] : 707 TYPE_PARSER(construct<AssumedShapeSpec>(maybe(specificationExpr) / ":")) 708 709 // R820 deferred-shape-spec -> : 710 // deferred-shape-spec-list - just a list of colons 711 TYPE_PARSER(construct<DeferredShapeSpecList>( 712 applyFunction(listLength, nonemptyList(":"_tok)))) 713 714 // R821 assumed-implied-spec -> [lower-bound :] * 715 TYPE_PARSER(construct<AssumedImpliedSpec>(maybe(specificationExpr / ":") / "*")) 716 717 // R822 assumed-size-spec -> explicit-shape-spec-list , assumed-implied-spec 718 TYPE_PARSER(construct<AssumedSizeSpec>( 719 nonemptyList(explicitShapeSpec) / ",", assumedImpliedSpec)) 720 721 // R823 implied-shape-or-assumed-size-spec -> assumed-implied-spec 722 // R824 implied-shape-spec -> assumed-implied-spec , assumed-implied-spec-list 723 // I.e., when the assumed-implied-spec-list has a single item, it constitutes an 724 // implied-shape-or-assumed-size-spec; otherwise, an implied-shape-spec. 725 TYPE_PARSER(construct<ImpliedShapeSpec>(nonemptyList(assumedImpliedSpec))) 726 727 // R825 assumed-rank-spec -> .. 728 TYPE_PARSER(construct<AssumedRankSpec>(".."_tok)) 729 730 // R826 intent-spec -> IN | OUT | INOUT 731 TYPE_PARSER(construct<IntentSpec>("IN OUT" >> pure(IntentSpec::Intent::InOut) || 732 "IN" >> pure(IntentSpec::Intent::In) || 733 "OUT" >> pure(IntentSpec::Intent::Out))) 734 735 // R827 access-stmt -> access-spec [[::] access-id-list] 736 TYPE_PARSER(construct<AccessStmt>(accessSpec, 737 defaulted(maybe("::"_tok) >> 738 nonemptyList("expected names and generic specifications"_err_en_US, 739 Parser<AccessId>{})))) 740 741 // R828 access-id -> access-name | generic-spec 742 TYPE_PARSER(construct<AccessId>(indirect(genericSpec)) || 743 construct<AccessId>(name)) // initially ambiguous with genericSpec 744 745 // R829 allocatable-stmt -> ALLOCATABLE [::] allocatable-decl-list 746 TYPE_PARSER(construct<AllocatableStmt>("ALLOCATABLE" >> maybe("::"_tok) >> 747 nonemptyList( 748 "expected object declarations"_err_en_US, Parser<ObjectDecl>{}))) 749 750 // R830 allocatable-decl -> 751 // object-name [( array-spec )] [lbracket coarray-spec rbracket] 752 // R860 target-decl -> 753 // object-name [( array-spec )] [lbracket coarray-spec rbracket] 754 TYPE_PARSER( 755 construct<ObjectDecl>(objectName, maybe(arraySpec), maybe(coarraySpec))) 756 757 // R831 asynchronous-stmt -> ASYNCHRONOUS [::] object-name-list 758 TYPE_PARSER(construct<AsynchronousStmt>("ASYNCHRONOUS" >> maybe("::"_tok) >> 759 nonemptyList("expected object names"_err_en_US, objectName))) 760 761 // R832 bind-stmt -> language-binding-spec [::] bind-entity-list 762 TYPE_PARSER(construct<BindStmt>(languageBindingSpec / maybe("::"_tok), 763 nonemptyList("expected bind entities"_err_en_US, Parser<BindEntity>{}))) 764 765 // R833 bind-entity -> entity-name | / common-block-name / 766 TYPE_PARSER(construct<BindEntity>(pure(BindEntity::Kind::Object), name) || 767 construct<BindEntity>("/" >> pure(BindEntity::Kind::Common), name / "/")) 768 769 // R834 codimension-stmt -> CODIMENSION [::] codimension-decl-list 770 TYPE_PARSER(construct<CodimensionStmt>("CODIMENSION" >> maybe("::"_tok) >> 771 nonemptyList("expected codimension declarations"_err_en_US, 772 Parser<CodimensionDecl>{}))) 773 774 // R835 codimension-decl -> coarray-name lbracket coarray-spec rbracket 775 TYPE_PARSER(construct<CodimensionDecl>(name, coarraySpec)) 776 777 // R836 contiguous-stmt -> CONTIGUOUS [::] object-name-list 778 TYPE_PARSER(construct<ContiguousStmt>("CONTIGUOUS" >> maybe("::"_tok) >> 779 nonemptyList("expected object names"_err_en_US, objectName))) 780 781 // R837 data-stmt -> DATA data-stmt-set [[,] data-stmt-set]... 782 TYPE_CONTEXT_PARSER("DATA statement"_en_US, 783 construct<DataStmt>( 784 "DATA" >> nonemptySeparated(Parser<DataStmtSet>{}, maybe(","_tok)))) 785 786 // R838 data-stmt-set -> data-stmt-object-list / data-stmt-value-list / 787 TYPE_PARSER(construct<DataStmtSet>( 788 nonemptyList( 789 "expected DATA statement objects"_err_en_US, Parser<DataStmtObject>{}), 790 withMessage("expected DATA statement value list"_err_en_US, 791 "/"_tok >> nonemptyList("expected DATA statement values"_err_en_US, 792 Parser<DataStmtValue>{})) / 793 "/")) 794 795 // R839 data-stmt-object -> variable | data-implied-do 796 TYPE_PARSER(construct<DataStmtObject>(indirect(variable)) || 797 construct<DataStmtObject>(dataImpliedDo)) 798 799 // R840 data-implied-do -> 800 // ( data-i-do-object-list , [integer-type-spec ::] data-i-do-variable 801 // = scalar-int-constant-expr , scalar-int-constant-expr 802 // [, scalar-int-constant-expr] ) 803 // R842 data-i-do-variable -> do-variable 804 TYPE_PARSER(parenthesized(construct<DataImpliedDo>( 805 nonemptyList(Parser<DataIDoObject>{} / lookAhead(","_tok)) / ",", 806 maybe(integerTypeSpec / "::"), loopBounds(scalarIntConstantExpr)))) 807 808 // R841 data-i-do-object -> 809 // array-element | scalar-structure-component | data-implied-do 810 TYPE_PARSER(construct<DataIDoObject>(scalar(indirect(designator))) || 811 construct<DataIDoObject>(indirect(dataImpliedDo))) 812 813 // R843 data-stmt-value -> [data-stmt-repeat *] data-stmt-constant 814 TYPE_PARSER(construct<DataStmtValue>( 815 maybe(Parser<DataStmtRepeat>{} / "*"), Parser<DataStmtConstant>{})) 816 817 // R847 constant-subobject -> designator 818 // R846 int-constant-subobject -> constant-subobject 819 constexpr auto constantSubobject{constant(indirect(designator))}; 820 821 // R844 data-stmt-repeat -> scalar-int-constant | scalar-int-constant-subobject 822 // R607 int-constant -> constant 823 // Factored into: constant -> literal-constant -> int-literal-constant 824 // The named-constant alternative of constant is subsumed by constant-subobject 825 TYPE_PARSER(construct<DataStmtRepeat>(intLiteralConstant) || 826 construct<DataStmtRepeat>(scalar(integer(constantSubobject)))) 827 828 // R845 data-stmt-constant -> 829 // scalar-constant | scalar-constant-subobject | 830 // signed-int-literal-constant | signed-real-literal-constant | 831 // null-init | initial-data-target | 832 // constant-structure-constructor 833 // N.B. scalar-constant and scalar-constant-subobject are ambiguous with 834 // initial-data-target; null-init and structure-constructor are ambiguous 835 // in the absence of parameters and components; structure-constructor with 836 // components can be ambiguous with a scalar-constant-subobject. 837 // So we parse literal constants, designator, null-init, and 838 // structure-constructor, so that semantics can figure things out later 839 // with the symbol table. 840 TYPE_PARSER(sourced(first(construct<DataStmtConstant>(literalConstant), 841 construct<DataStmtConstant>(signedRealLiteralConstant), 842 construct<DataStmtConstant>(signedIntLiteralConstant), 843 extension<LanguageFeature::SignedComplexLiteral>( 844 construct<DataStmtConstant>(Parser<SignedComplexLiteralConstant>{})), 845 construct<DataStmtConstant>(nullInit), 846 construct<DataStmtConstant>(indirect(designator) / !"("_tok), 847 construct<DataStmtConstant>(Parser<StructureConstructor>{})))) 848 849 // R848 dimension-stmt -> 850 // DIMENSION [::] array-name ( array-spec ) 851 // [, array-name ( array-spec )]... 852 TYPE_CONTEXT_PARSER("DIMENSION statement"_en_US, 853 construct<DimensionStmt>("DIMENSION" >> maybe("::"_tok) >> 854 nonemptyList("expected array specifications"_err_en_US, 855 construct<DimensionStmt::Declaration>(name, arraySpec)))) 856 857 // R849 intent-stmt -> INTENT ( intent-spec ) [::] dummy-arg-name-list 858 TYPE_CONTEXT_PARSER("INTENT statement"_en_US, 859 construct<IntentStmt>( 860 "INTENT" >> parenthesized(intentSpec) / maybe("::"_tok), listOfNames)) 861 862 // R850 optional-stmt -> OPTIONAL [::] dummy-arg-name-list 863 TYPE_PARSER( 864 construct<OptionalStmt>("OPTIONAL" >> maybe("::"_tok) >> listOfNames)) 865 866 // R851 parameter-stmt -> PARAMETER ( named-constant-def-list ) 867 // Legacy extension: omitted parentheses, no implicit typing from names 868 TYPE_CONTEXT_PARSER("PARAMETER statement"_en_US, 869 construct<ParameterStmt>( 870 "PARAMETER" >> parenthesized(nonemptyList(Parser<NamedConstantDef>{})))) 871 TYPE_CONTEXT_PARSER("old style PARAMETER statement"_en_US, 872 extension<LanguageFeature::OldStyleParameter>(construct<OldParameterStmt>( 873 "PARAMETER" >> nonemptyList(Parser<NamedConstantDef>{})))) 874 875 // R852 named-constant-def -> named-constant = constant-expr 876 TYPE_PARSER(construct<NamedConstantDef>(namedConstant, "=" >> constantExpr)) 877 878 // R853 pointer-stmt -> POINTER [::] pointer-decl-list 879 TYPE_PARSER(construct<PointerStmt>("POINTER" >> maybe("::"_tok) >> 880 nonemptyList( 881 "expected pointer declarations"_err_en_US, Parser<PointerDecl>{}))) 882 883 // R854 pointer-decl -> 884 // object-name [( deferred-shape-spec-list )] | proc-entity-name 885 TYPE_PARSER( 886 construct<PointerDecl>(name, maybe(parenthesized(deferredShapeSpecList)))) 887 888 // R855 protected-stmt -> PROTECTED [::] entity-name-list 889 TYPE_PARSER( 890 construct<ProtectedStmt>("PROTECTED" >> maybe("::"_tok) >> listOfNames)) 891 892 // R856 save-stmt -> SAVE [[::] saved-entity-list] 893 TYPE_PARSER(construct<SaveStmt>( 894 "SAVE" >> defaulted(maybe("::"_tok) >> 895 nonemptyList("expected SAVE entities"_err_en_US, 896 Parser<SavedEntity>{})))) 897 898 // R857 saved-entity -> object-name | proc-pointer-name | / common-block-name / 899 // R858 proc-pointer-name -> name 900 TYPE_PARSER(construct<SavedEntity>(pure(SavedEntity::Kind::Entity), name) || 901 construct<SavedEntity>("/" >> pure(SavedEntity::Kind::Common), name / "/")) 902 903 // R859 target-stmt -> TARGET [::] target-decl-list 904 TYPE_PARSER(construct<TargetStmt>("TARGET" >> maybe("::"_tok) >> 905 nonemptyList("expected objects"_err_en_US, Parser<ObjectDecl>{}))) 906 907 // R861 value-stmt -> VALUE [::] dummy-arg-name-list 908 TYPE_PARSER(construct<ValueStmt>("VALUE" >> maybe("::"_tok) >> listOfNames)) 909 910 // R862 volatile-stmt -> VOLATILE [::] object-name-list 911 TYPE_PARSER(construct<VolatileStmt>("VOLATILE" >> maybe("::"_tok) >> 912 nonemptyList("expected object names"_err_en_US, objectName))) 913 914 // R866 implicit-name-spec -> EXTERNAL | TYPE 915 constexpr auto implicitNameSpec{ 916 "EXTERNAL" >> pure(ImplicitStmt::ImplicitNoneNameSpec::External) || 917 "TYPE" >> pure(ImplicitStmt::ImplicitNoneNameSpec::Type)}; 918 919 // R863 implicit-stmt -> 920 // IMPLICIT implicit-spec-list | 921 // IMPLICIT NONE [( [implicit-name-spec-list] )] 922 TYPE_CONTEXT_PARSER("IMPLICIT statement"_en_US, 923 construct<ImplicitStmt>( 924 "IMPLICIT" >> nonemptyList("expected IMPLICIT specifications"_err_en_US, 925 Parser<ImplicitSpec>{})) || 926 construct<ImplicitStmt>("IMPLICIT NONE"_sptok >> 927 defaulted(parenthesized(optionalList(implicitNameSpec))))) 928 929 // R864 implicit-spec -> declaration-type-spec ( letter-spec-list ) 930 // The variant form of declarationTypeSpec is meant to avoid misrecognition 931 // of a letter-spec as a simple parenthesized expression for kind or character 932 // length, e.g., PARAMETER(I=5,N=1); IMPLICIT REAL(I-N)(O-Z) vs. 933 // IMPLICIT REAL(I-N). The variant form needs to attempt to reparse only 934 // types with optional parenthesized kind/length expressions, so derived 935 // type specs, DOUBLE PRECISION, and DOUBLE COMPLEX need not be considered. 936 constexpr auto noKindSelector{construct<std::optional<KindSelector>>()}; 937 constexpr auto implicitSpecDeclarationTypeSpecRetry{ 938 construct<DeclarationTypeSpec>(first( 939 construct<IntrinsicTypeSpec>( 940 construct<IntegerTypeSpec>("INTEGER" >> noKindSelector)), 941 construct<IntrinsicTypeSpec>( 942 construct<IntrinsicTypeSpec::Real>("REAL" >> noKindSelector)), 943 construct<IntrinsicTypeSpec>( 944 construct<IntrinsicTypeSpec::Complex>("COMPLEX" >> noKindSelector)), 945 construct<IntrinsicTypeSpec>(construct<IntrinsicTypeSpec::Character>( 946 "CHARACTER" >> construct<std::optional<CharSelector>>())), 947 construct<IntrinsicTypeSpec>(construct<IntrinsicTypeSpec::Logical>( 948 "LOGICAL" >> noKindSelector))))}; 949 950 TYPE_PARSER(construct<ImplicitSpec>(declarationTypeSpec, 951 parenthesized(nonemptyList(Parser<LetterSpec>{}))) || 952 construct<ImplicitSpec>(implicitSpecDeclarationTypeSpecRetry, 953 parenthesized(nonemptyList(Parser<LetterSpec>{})))) 954 955 // R865 letter-spec -> letter [- letter] 956 TYPE_PARSER(space >> (construct<LetterSpec>(letter, maybe("-" >> letter)) || 957 construct<LetterSpec>(otherIdChar, 958 construct<std::optional<const char *>>()))) 959 960 // R867 import-stmt -> 961 // IMPORT [[::] import-name-list] | 962 // IMPORT , ONLY : import-name-list | IMPORT , NONE | IMPORT , ALL 963 TYPE_CONTEXT_PARSER("IMPORT statement"_en_US, 964 construct<ImportStmt>( 965 "IMPORT , ONLY :" >> pure(common::ImportKind::Only), listOfNames) || 966 construct<ImportStmt>( 967 "IMPORT , NONE" >> pure(common::ImportKind::None)) || 968 construct<ImportStmt>( 969 "IMPORT , ALL" >> pure(common::ImportKind::All)) || 970 construct<ImportStmt>( 971 "IMPORT" >> maybe("::"_tok) >> optionalList(name))) 972 973 // R868 namelist-stmt -> 974 // NAMELIST / namelist-group-name / namelist-group-object-list 975 // [[,] / namelist-group-name / namelist-group-object-list]... 976 // R869 namelist-group-object -> variable-name 977 TYPE_PARSER(construct<NamelistStmt>("NAMELIST" >> 978 nonemptySeparated( 979 construct<NamelistStmt::Group>("/" >> name / "/", listOfNames), 980 maybe(","_tok)))) 981 982 // R870 equivalence-stmt -> EQUIVALENCE equivalence-set-list 983 // R871 equivalence-set -> ( equivalence-object , equivalence-object-list ) 984 TYPE_PARSER(construct<EquivalenceStmt>("EQUIVALENCE" >> 985 nonemptyList( 986 parenthesized(nonemptyList("expected EQUIVALENCE objects"_err_en_US, 987 Parser<EquivalenceObject>{}))))) 988 989 // R872 equivalence-object -> variable-name | array-element | substring 990 TYPE_PARSER(construct<EquivalenceObject>(indirect(designator))) 991 992 // R873 common-stmt -> 993 // COMMON [/ [common-block-name] /] common-block-object-list 994 // [[,] / [common-block-name] / common-block-object-list]... 995 TYPE_PARSER( 996 construct<CommonStmt>("COMMON" >> defaulted("/" >> maybe(name) / "/"), 997 nonemptyList("expected COMMON block objects"_err_en_US, 998 Parser<CommonBlockObject>{}), 999 many(maybe(","_tok) >> 1000 construct<CommonStmt::Block>("/" >> maybe(name) / "/", 1001 nonemptyList("expected COMMON block objects"_err_en_US, 1002 Parser<CommonBlockObject>{}))))) 1003 1004 // R874 common-block-object -> variable-name [( array-spec )] 1005 TYPE_PARSER(construct<CommonBlockObject>(name, maybe(arraySpec))) 1006 1007 // R901 designator -> object-name | array-element | array-section | 1008 // coindexed-named-object | complex-part-designator | 1009 // structure-component | substring 1010 // The Standard's productions for designator and its alternatives are 1011 // ambiguous without recourse to a symbol table. Many of the alternatives 1012 // for designator (viz., array-element, coindexed-named-object, 1013 // and structure-component) are all syntactically just data-ref. 1014 // What designator boils down to is this: 1015 // It starts with either a name or a character literal. 1016 // If it starts with a character literal, it must be a substring. 1017 // If it starts with a name, it's a sequence of %-separated parts; 1018 // each part is a name, maybe a (section-subscript-list), and 1019 // maybe an [image-selector]. 1020 // If it's a substring, it ends with (substring-range). 1021 TYPE_CONTEXT_PARSER("designator"_en_US, 1022 sourced(construct<Designator>(substring) || construct<Designator>(dataRef))) 1023 1024 constexpr auto percentOrDot{"%"_tok || 1025 // legacy VAX extension for RECORD field access 1026 extension<LanguageFeature::DECStructures>( 1027 "."_tok / lookAhead(OldStructureComponentName{}))}; 1028 1029 // R902 variable -> designator | function-reference 1030 // This production appears to be left-recursive in the grammar via 1031 // function-reference -> procedure-designator -> proc-component-ref -> 1032 // scalar-variable 1033 // and would be so if we were to allow functions to be called via procedure 1034 // pointer components within derived type results of other function references 1035 // (a reasonable extension, esp. in the case of procedure pointer components 1036 // that are NOPASS). However, Fortran constrains the use of a variable in a 1037 // proc-component-ref to be a data-ref without coindices (C1027). 1038 // Some array element references will be misrecognized as function references. 1039 constexpr auto noMoreAddressing{!"("_tok >> !"["_tok >> !percentOrDot}; 1040 TYPE_CONTEXT_PARSER("variable"_en_US, 1041 construct<Variable>(indirect(functionReference / noMoreAddressing)) || 1042 construct<Variable>(indirect(designator))) 1043 1044 // R908 substring -> parent-string ( substring-range ) 1045 // R909 parent-string -> 1046 // scalar-variable-name | array-element | coindexed-named-object | 1047 // scalar-structure-component | scalar-char-literal-constant | 1048 // scalar-named-constant 1049 TYPE_PARSER( 1050 construct<Substring>(dataRef, parenthesized(Parser<SubstringRange>{}))) 1051 1052 TYPE_PARSER(construct<CharLiteralConstantSubstring>( 1053 charLiteralConstant, parenthesized(Parser<SubstringRange>{}))) 1054 1055 // R910 substring-range -> [scalar-int-expr] : [scalar-int-expr] 1056 TYPE_PARSER(construct<SubstringRange>( 1057 maybe(scalarIntExpr), ":" >> maybe(scalarIntExpr))) 1058 1059 // R911 data-ref -> part-ref [% part-ref]... 1060 // R914 coindexed-named-object -> data-ref 1061 // R917 array-element -> data-ref 1062 TYPE_PARSER( 1063 construct<DataRef>(nonemptySeparated(Parser<PartRef>{}, percentOrDot))) 1064 1065 // R912 part-ref -> part-name [( section-subscript-list )] [image-selector] 1066 TYPE_PARSER(construct<PartRef>(name, 1067 defaulted( 1068 parenthesized(nonemptyList(Parser<SectionSubscript>{})) / !"=>"_tok), 1069 maybe(Parser<ImageSelector>{}))) 1070 1071 // R913 structure-component -> data-ref 1072 // The final part-ref in the data-ref is not allowed to have subscripts. 1073 TYPE_PARSER(construct<StructureComponent>( 1074 construct<DataRef>(some(Parser<PartRef>{} / percentOrDot)), name)) 1075 1076 // R919 subscript -> scalar-int-expr 1077 constexpr auto subscript{scalarIntExpr}; 1078 1079 // R920 section-subscript -> subscript | subscript-triplet | vector-subscript 1080 // R923 vector-subscript -> int-expr 1081 // N.B. The distinction that needs to be made between "subscript" and 1082 // "vector-subscript" is deferred to semantic analysis. 1083 TYPE_PARSER(construct<SectionSubscript>(Parser<SubscriptTriplet>{}) || 1084 construct<SectionSubscript>(intExpr)) 1085 1086 // R921 subscript-triplet -> [subscript] : [subscript] [: stride] 1087 TYPE_PARSER(construct<SubscriptTriplet>( 1088 maybe(subscript), ":" >> maybe(subscript), maybe(":" >> subscript))) 1089 1090 // R925 cosubscript -> scalar-int-expr 1091 constexpr auto cosubscript{scalarIntExpr}; 1092 1093 // R924 image-selector -> 1094 // lbracket cosubscript-list [, image-selector-spec-list] rbracket 1095 TYPE_CONTEXT_PARSER("image selector"_en_US, 1096 construct<ImageSelector>( 1097 "[" >> nonemptyList(cosubscript / lookAhead(space / ",]"_ch)), 1098 defaulted("," >> nonemptyList(Parser<ImageSelectorSpec>{})) / "]")) 1099 1100 // R926 image-selector-spec -> 1101 // STAT = stat-variable | TEAM = team-value | 1102 // TEAM_NUMBER = scalar-int-expr 1103 TYPE_PARSER(construct<ImageSelectorSpec>(construct<ImageSelectorSpec::Stat>( 1104 "STAT =" >> scalar(integer(indirect(variable))))) || 1105 construct<ImageSelectorSpec>(construct<TeamValue>("TEAM =" >> teamValue)) || 1106 construct<ImageSelectorSpec>(construct<ImageSelectorSpec::Team_Number>( 1107 "TEAM_NUMBER =" >> scalarIntExpr))) 1108 1109 // R927 allocate-stmt -> 1110 // ALLOCATE ( [type-spec ::] allocation-list [, alloc-opt-list] ) 1111 TYPE_CONTEXT_PARSER("ALLOCATE statement"_en_US, 1112 construct<AllocateStmt>("ALLOCATE (" >> maybe(typeSpec / "::"), 1113 nonemptyList(Parser<Allocation>{}), 1114 defaulted("," >> nonemptyList(Parser<AllocOpt>{})) / ")")) 1115 1116 // R928 alloc-opt -> 1117 // ERRMSG = errmsg-variable | MOLD = source-expr | 1118 // SOURCE = source-expr | STAT = stat-variable 1119 // R931 source-expr -> expr 1120 TYPE_PARSER(construct<AllocOpt>( 1121 construct<AllocOpt::Mold>("MOLD =" >> indirect(expr))) || 1122 construct<AllocOpt>( 1123 construct<AllocOpt::Source>("SOURCE =" >> indirect(expr))) || 1124 construct<AllocOpt>(statOrErrmsg)) 1125 1126 // R929 stat-variable -> scalar-int-variable 1127 TYPE_PARSER(construct<StatVariable>(scalar(integer(variable)))) 1128 1129 // R932 allocation -> 1130 // allocate-object [( allocate-shape-spec-list )] 1131 // [lbracket allocate-coarray-spec rbracket] 1132 TYPE_PARSER(construct<Allocation>(Parser<AllocateObject>{}, 1133 defaulted(parenthesized(nonemptyList(Parser<AllocateShapeSpec>{}))), 1134 maybe(bracketed(Parser<AllocateCoarraySpec>{})))) 1135 1136 // R933 allocate-object -> variable-name | structure-component 1137 TYPE_PARSER(construct<AllocateObject>(structureComponent) || 1138 construct<AllocateObject>(name / !"="_tok)) 1139 1140 // R934 allocate-shape-spec -> [lower-bound-expr :] upper-bound-expr 1141 // R938 allocate-coshape-spec -> [lower-bound-expr :] upper-bound-expr 1142 TYPE_PARSER(construct<AllocateShapeSpec>(maybe(boundExpr / ":"), boundExpr)) 1143 1144 // R937 allocate-coarray-spec -> 1145 // [allocate-coshape-spec-list ,] [lower-bound-expr :] * 1146 TYPE_PARSER(construct<AllocateCoarraySpec>( 1147 defaulted(nonemptyList(Parser<AllocateShapeSpec>{}) / ","), 1148 maybe(boundExpr / ":") / "*")) 1149 1150 // R939 nullify-stmt -> NULLIFY ( pointer-object-list ) 1151 TYPE_CONTEXT_PARSER("NULLIFY statement"_en_US, 1152 "NULLIFY" >> parenthesized(construct<NullifyStmt>( 1153 nonemptyList(Parser<PointerObject>{})))) 1154 1155 // R940 pointer-object -> 1156 // variable-name | structure-component | proc-pointer-name 1157 TYPE_PARSER(construct<PointerObject>(structureComponent) || 1158 construct<PointerObject>(name)) 1159 1160 // R941 deallocate-stmt -> 1161 // DEALLOCATE ( allocate-object-list [, dealloc-opt-list] ) 1162 TYPE_CONTEXT_PARSER("DEALLOCATE statement"_en_US, 1163 construct<DeallocateStmt>( 1164 "DEALLOCATE (" >> nonemptyList(Parser<AllocateObject>{}), 1165 defaulted("," >> nonemptyList(statOrErrmsg)) / ")")) 1166 1167 // R942 dealloc-opt -> STAT = stat-variable | ERRMSG = errmsg-variable 1168 // R1165 sync-stat -> STAT = stat-variable | ERRMSG = errmsg-variable 1169 TYPE_PARSER(construct<StatOrErrmsg>("STAT =" >> statVariable) || 1170 construct<StatOrErrmsg>("ERRMSG =" >> msgVariable)) 1171 1172 // Directives, extensions, and deprecated statements 1173 // !DIR$ IGNORE_TKR [ [(tkr...)] name ]... 1174 // !DIR$ name... 1175 constexpr auto beginDirective{skipStuffBeforeStatement >> "!"_ch}; 1176 constexpr auto endDirective{space >> endOfLine}; 1177 constexpr auto ignore_tkr{ 1178 "DIR$ IGNORE_TKR" >> optionalList(construct<CompilerDirective::IgnoreTKR>( 1179 defaulted(parenthesized(some("tkr"_ch))), name))}; 1180 TYPE_PARSER(beginDirective >> 1181 sourced(construct<CompilerDirective>(ignore_tkr) || 1182 construct<CompilerDirective>( 1183 "DIR$" >> many(construct<CompilerDirective::NameValue>(name, 1184 maybe(("="_tok || ":"_tok) >> digitString64))))) / 1185 endDirective) 1186 1187 TYPE_PARSER(extension<LanguageFeature::CrayPointer>(construct<BasedPointerStmt>( 1188 "POINTER" >> nonemptyList("expected POINTER associations"_err_en_US, 1189 construct<BasedPointer>("(" >> objectName / ",", 1190 objectName, maybe(Parser<ArraySpec>{}) / ")"))))) 1191 1192 // Subtle: the name includes the surrounding slashes, which avoids 1193 // clashes with other uses of the name in the same scope. 1194 TYPE_PARSER(construct<StructureStmt>( 1195 "STRUCTURE" >> maybe(sourced("/" >> name / "/")), optionalList(entityDecl))) 1196 1197 constexpr auto nestedStructureDef{ 1198 CONTEXT_PARSER("nested STRUCTURE definition"_en_US, 1199 construct<StructureDef>(statement(NestedStructureStmt{}), 1200 many(Parser<StructureField>{}), 1201 statement(construct<StructureDef::EndStructureStmt>( 1202 "END STRUCTURE"_tok))))}; 1203 1204 TYPE_PARSER(construct<StructureField>(statement(StructureComponents{})) || 1205 construct<StructureField>(indirect(Parser<Union>{})) || 1206 construct<StructureField>(indirect(nestedStructureDef))) 1207 1208 TYPE_CONTEXT_PARSER("STRUCTURE definition"_en_US, 1209 extension<LanguageFeature::DECStructures>(construct<StructureDef>( 1210 statement(Parser<StructureStmt>{}), many(Parser<StructureField>{}), 1211 statement( 1212 construct<StructureDef::EndStructureStmt>("END STRUCTURE"_tok))))) 1213 1214 TYPE_CONTEXT_PARSER("UNION definition"_en_US, 1215 construct<Union>(statement(construct<Union::UnionStmt>("UNION"_tok)), 1216 many(Parser<Map>{}), 1217 statement(construct<Union::EndUnionStmt>("END UNION"_tok)))) 1218 1219 TYPE_CONTEXT_PARSER("MAP definition"_en_US, 1220 construct<Map>(statement(construct<Map::MapStmt>("MAP"_tok)), 1221 many(Parser<StructureField>{}), 1222 statement(construct<Map::EndMapStmt>("END MAP"_tok)))) 1223 1224 TYPE_CONTEXT_PARSER("arithmetic IF statement"_en_US, 1225 deprecated<LanguageFeature::ArithmeticIF>(construct<ArithmeticIfStmt>( 1226 "IF" >> parenthesized(expr), label / ",", label / ",", label))) 1227 1228 TYPE_CONTEXT_PARSER("ASSIGN statement"_en_US, 1229 deprecated<LanguageFeature::Assign>( 1230 construct<AssignStmt>("ASSIGN" >> label, "TO" >> name))) 1231 1232 TYPE_CONTEXT_PARSER("assigned GOTO statement"_en_US, 1233 deprecated<LanguageFeature::AssignedGOTO>(construct<AssignedGotoStmt>( 1234 "GO TO" >> name, 1235 defaulted(maybe(","_tok) >> 1236 parenthesized(nonemptyList("expected labels"_err_en_US, label)))))) 1237 1238 TYPE_CONTEXT_PARSER("PAUSE statement"_en_US, 1239 deprecated<LanguageFeature::Pause>( 1240 construct<PauseStmt>("PAUSE" >> maybe(Parser<StopCode>{})))) 1241 1242 // These requirement productions are defined by the Fortran standard but never 1243 // used directly by the grammar: 1244 // R620 delimiter -> ( | ) | / | [ | ] | (/ | /) 1245 // R1027 numeric-expr -> expr 1246 // R1031 int-constant-expr -> int-expr 1247 // R1221 dtv-type-spec -> TYPE ( derived-type-spec ) | 1248 // CLASS ( derived-type-spec ) 1249 // 1250 // These requirement productions are defined and used, but need not be 1251 // defined independently here in this file: 1252 // R771 lbracket -> [ 1253 // R772 rbracket -> ] 1254 // 1255 // Further note that: 1256 // R607 int-constant -> constant 1257 // is used only once via R844 scalar-int-constant 1258 // R904 logical-variable -> variable 1259 // is used only via scalar-logical-variable 1260 // R906 default-char-variable -> variable 1261 // is used only via scalar-default-char-variable 1262 // R907 int-variable -> variable 1263 // is used only via scalar-int-variable 1264 // R915 complex-part-designator -> designator % RE | designator % IM 1265 // %RE and %IM are initially recognized as structure components 1266 // R916 type-param-inquiry -> designator % type-param-name 1267 // is occulted by structure component designators 1268 // R918 array-section -> 1269 // data-ref [( substring-range )] | complex-part-designator 1270 // is not used because parsing is not sensitive to rank 1271 // R1030 default-char-constant-expr -> default-char-expr 1272 // is only used via scalar-default-char-constant-expr 1273 } // namespace Fortran::parser 1274