1 | //===-- lib/Parser/expr-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 | // Per-type parsers for expressions. |
10 | |
11 | #include "expr-parsers.h" |
12 | #include "basic-parsers.h" |
13 | #include "misc-parsers.h" |
14 | #include "stmt-parser.h" |
15 | #include "token-parsers.h" |
16 | #include "type-parser-implementation.h" |
17 | #include "flang/Parser/characters.h" |
18 | #include "flang/Parser/parse-tree.h" |
19 | |
20 | namespace Fortran::parser { |
21 | |
22 | // R764 boz-literal-constant -> binary-constant | octal-constant | hex-constant |
23 | // R765 binary-constant -> B ' digit [digit]... ' | B " digit [digit]... " |
24 | // R766 octal-constant -> O ' digit [digit]... ' | O " digit [digit]... " |
25 | // R767 hex-constant -> |
26 | // Z ' hex-digit [hex-digit]... ' | Z " hex-digit [hex-digit]... " |
27 | // extension: X accepted for Z |
28 | // extension: BOZX suffix accepted |
29 | TYPE_PARSER(construct<BOZLiteralConstant>(BOZLiteral{})) |
30 | |
31 | // R769 array-constructor -> (/ ac-spec /) | lbracket ac-spec rbracket |
32 | TYPE_CONTEXT_PARSER("array constructor"_en_US, |
33 | construct<ArrayConstructor>( |
34 | "(/">> Parser<AcSpec>{} / "/)"|| bracketed(Parser<AcSpec>{}))) |
35 | |
36 | // R770 ac-spec -> type-spec :: | [type-spec ::] ac-value-list |
37 | TYPE_PARSER(construct<AcSpec>(maybe(typeSpec / "::"), |
38 | nonemptyList("expected array constructor values"_err_en_US, |
39 | Parser<AcValue>{})) || |
40 | construct<AcSpec>(typeSpec / "::")) |
41 | |
42 | // R773 ac-value -> expr | ac-implied-do |
43 | TYPE_PARSER( |
44 | // PGI/Intel extension: accept triplets in array constructors |
45 | extension<LanguageFeature::TripletInArrayConstructor>( |
46 | "nonstandard usage: triplet in array constructor"_port_en_US, |
47 | construct<AcValue>(construct<AcValue::Triplet>(scalarIntExpr, |
48 | ":">> scalarIntExpr, maybe( ":">> scalarIntExpr)))) || |
49 | construct<AcValue>(indirect(expr)) || |
50 | construct<AcValue>(indirect(Parser<AcImpliedDo>{}))) |
51 | |
52 | // R774 ac-implied-do -> ( ac-value-list , ac-implied-do-control ) |
53 | TYPE_PARSER(parenthesized( |
54 | construct<AcImpliedDo>(nonemptyList(Parser<AcValue>{} / lookAhead(","_tok)), |
55 | ",">> Parser<AcImpliedDoControl>{}))) |
56 | |
57 | // R775 ac-implied-do-control -> |
58 | // [integer-type-spec ::] ac-do-variable = scalar-int-expr , |
59 | // scalar-int-expr [, scalar-int-expr] |
60 | // R776 ac-do-variable -> do-variable |
61 | TYPE_PARSER(construct<AcImpliedDoControl>( |
62 | maybe(integerTypeSpec / "::"), loopBounds(scalarIntExpr))) |
63 | |
64 | // R1001 primary -> |
65 | // literal-constant | designator | array-constructor | |
66 | // structure-constructor | function-reference | type-param-inquiry | |
67 | // type-param-name | ( expr ) |
68 | // type-param-inquiry is parsed as a structure component, except for |
69 | // substring%KIND/LEN |
70 | constexpr auto primary{instrumented("primary"_en_US, |
71 | first(construct<Expr>(indirect(charLiteralConstantSubstring)), |
72 | construct<Expr>(literalConstant), |
73 | construct<Expr>(construct<Expr::Parentheses>("(">> |
74 | expr / !","_tok/ recovery( ")"_tok, SkipPastNested<'(', ')'>{}))), |
75 | construct<Expr>(indirect(functionReference) / !"("_tok/ ! "%"_tok), |
76 | construct<Expr>(designator / !"("_tok/ ! "%"_tok), |
77 | construct<Expr>(indirect(Parser<SubstringInquiry>{})), // %LEN or %KIND |
78 | construct<Expr>(Parser<StructureConstructor>{}), |
79 | construct<Expr>(Parser<ArrayConstructor>{}), |
80 | // PGI/XLF extension: COMPLEX constructor (x,y) |
81 | construct<Expr>(parenthesized( |
82 | construct<Expr::ComplexConstructor>(expr, ",">> expr))), |
83 | extension<LanguageFeature::PercentLOC>( |
84 | "nonstandard usage: %LOC"_port_en_US, |
85 | construct<Expr>("%LOC">> parenthesized(construct<Expr::PercentLoc>( |
86 | indirect(variable)))))))}; |
87 | |
88 | // R1002 level-1-expr -> [defined-unary-op] primary |
89 | // TODO: Reasonable extension: permit multiple defined-unary-ops |
90 | constexpr auto level1Expr{sourced( |
91 | primary || // must come before define op to resolve .TRUE._8 ambiguity |
92 | construct<Expr>(construct<Expr::DefinedUnary>(definedOpName, primary)))}; |
93 | |
94 | // R1004 mult-operand -> level-1-expr [power-op mult-operand] |
95 | // R1007 power-op -> ** |
96 | // Exponentiation (**) is Fortran's only right-associative binary operation. |
97 | struct MultOperand { |
98 | using resultType = Expr; |
99 | constexpr MultOperand() {} |
100 | static inline std::optional<Expr> Parse(ParseState &); |
101 | }; |
102 | |
103 | // Extension: allow + or - before a mult-operand |
104 | // Such a unary operand has lower precedence than exponentiation, |
105 | // so -x**2 is -(x**2), not (-x)**2; this matches all other |
106 | // compilers with this extension. |
107 | static constexpr auto standardMultOperand{sourced(MultOperand{})}; |
108 | static constexpr auto multOperand{standardMultOperand || |
109 | extension<LanguageFeature::SignedMultOperand>( |
110 | "nonstandard usage: signed mult-operand"_port_en_US, |
111 | construct<Expr>( |
112 | construct<Expr::UnaryPlus>("+">> standardMultOperand))) || |
113 | extension<LanguageFeature::SignedMultOperand>( |
114 | "nonstandard usage: signed mult-operand"_port_en_US, |
115 | construct<Expr>(construct<Expr::Negate>("-">> standardMultOperand)))}; |
116 | |
117 | inline std::optional<Expr> MultOperand::Parse(ParseState &state) { |
118 | std::optional<Expr> result{level1Expr.Parse(state)}; |
119 | if (result) { |
120 | static constexpr auto op{attempt("**"_tok)}; |
121 | if (op.Parse(state)) { |
122 | std::function<Expr(Expr &&)> power{[&result](Expr &&right) { |
123 | return Expr{Expr::Power(std::move(result).value(), std::move(right))}; |
124 | }}; |
125 | return applyLambda(power, multOperand).Parse(state); // right-recursive |
126 | } |
127 | } |
128 | return result; |
129 | } |
130 | |
131 | // R1005 add-operand -> [add-operand mult-op] mult-operand |
132 | // R1008 mult-op -> * | / |
133 | // The left recursion in the grammar is implemented iteratively. |
134 | struct AddOperand { |
135 | using resultType = Expr; |
136 | constexpr AddOperand() {} |
137 | static inline std::optional<Expr> Parse(ParseState &state) { |
138 | std::optional<Expr> result{multOperand.Parse(state)}; |
139 | if (result) { |
140 | auto source{result->source}; |
141 | std::function<Expr(Expr &&)> multiply{[&result](Expr &&right) { |
142 | return Expr{ |
143 | Expr::Multiply(std::move(result).value(), std::move(right))}; |
144 | }}; |
145 | std::function<Expr(Expr &&)> divide{[&result](Expr &&right) { |
146 | return Expr{Expr::Divide(std::move(result).value(), std::move(right))}; |
147 | }}; |
148 | auto more{attempt(sourced("*">> applyLambda(multiply, multOperand) || |
149 | "/">> applyLambda(divide, multOperand)))}; |
150 | while (std::optional<Expr> next{more.Parse(state)}) { |
151 | result = std::move(next); |
152 | result->source.ExtendToCover(source); |
153 | } |
154 | } |
155 | return result; |
156 | } |
157 | }; |
158 | constexpr AddOperand addOperand; |
159 | |
160 | // R1006 level-2-expr -> [[level-2-expr] add-op] add-operand |
161 | // R1009 add-op -> + | - |
162 | // These are left-recursive productions, implemented iteratively. |
163 | // Note that standard Fortran admits a unary + or - to appear only here, |
164 | // by means of a missing first operand; e.g., 2*-3 is valid in C but not |
165 | // standard Fortran. We accept unary + and - to appear before any primary |
166 | // as an extension. |
167 | struct Level2Expr { |
168 | using resultType = Expr; |
169 | constexpr Level2Expr() {} |
170 | static inline std::optional<Expr> Parse(ParseState &state) { |
171 | static constexpr auto unary{ |
172 | sourced( |
173 | construct<Expr>(construct<Expr::UnaryPlus>("+">> addOperand)) || |
174 | construct<Expr>(construct<Expr::Negate>("-">> addOperand))) || |
175 | addOperand}; |
176 | std::optional<Expr> result{unary.Parse(state)}; |
177 | if (result) { |
178 | auto source{result->source}; |
179 | std::function<Expr(Expr &&)> add{[&result](Expr &&right) { |
180 | return Expr{Expr::Add(std::move(result).value(), std::move(right))}; |
181 | }}; |
182 | std::function<Expr(Expr &&)> subtract{[&result](Expr &&right) { |
183 | return Expr{ |
184 | Expr::Subtract(std::move(result).value(), std::move(right))}; |
185 | }}; |
186 | auto more{attempt(sourced("+">> applyLambda(add, addOperand) || |
187 | "-">> applyLambda(subtract, addOperand)))}; |
188 | while (std::optional<Expr> next{more.Parse(state)}) { |
189 | result = std::move(next); |
190 | result->source.ExtendToCover(source); |
191 | } |
192 | } |
193 | return result; |
194 | } |
195 | }; |
196 | constexpr Level2Expr level2Expr; |
197 | |
198 | // R1010 level-3-expr -> [level-3-expr concat-op] level-2-expr |
199 | // R1011 concat-op -> // |
200 | // Concatenation (//) is left-associative for parsing performance, although |
201 | // one would never notice if it were right-associated. |
202 | struct Level3Expr { |
203 | using resultType = Expr; |
204 | constexpr Level3Expr() {} |
205 | static inline std::optional<Expr> Parse(ParseState &state) { |
206 | std::optional<Expr> result{level2Expr.Parse(state)}; |
207 | if (result) { |
208 | auto source{result->source}; |
209 | std::function<Expr(Expr &&)> concat{[&result](Expr &&right) { |
210 | return Expr{Expr::Concat(std::move(result).value(), std::move(right))}; |
211 | }}; |
212 | auto more{attempt(sourced("//">> applyLambda(concat, level2Expr)))}; |
213 | while (std::optional<Expr> next{more.Parse(state)}) { |
214 | result = std::move(next); |
215 | result->source.ExtendToCover(source); |
216 | } |
217 | } |
218 | return result; |
219 | } |
220 | }; |
221 | constexpr Level3Expr level3Expr; |
222 | |
223 | // R1012 level-4-expr -> [level-3-expr rel-op] level-3-expr |
224 | // R1013 rel-op -> |
225 | // .EQ. | .NE. | .LT. | .LE. | .GT. | .GE. | |
226 | // == | /= | < | <= | > | >= @ | <> |
227 | // N.B. relations are not recursive (i.e., LOGICAL is not ordered) |
228 | struct Level4Expr { |
229 | using resultType = Expr; |
230 | constexpr Level4Expr() {} |
231 | static inline std::optional<Expr> Parse(ParseState &state) { |
232 | std::optional<Expr> result{level3Expr.Parse(state)}; |
233 | if (result) { |
234 | auto source{result->source}; |
235 | std::function<Expr(Expr &&)> lt{[&result](Expr &&right) { |
236 | return Expr{Expr::LT(std::move(result).value(), std::move(right))}; |
237 | }}; |
238 | std::function<Expr(Expr &&)> le{[&result](Expr &&right) { |
239 | return Expr{Expr::LE(std::move(result).value(), std::move(right))}; |
240 | }}; |
241 | std::function<Expr(Expr &&)> eq{[&result](Expr &&right) { |
242 | return Expr{Expr::EQ(std::move(result).value(), std::move(right))}; |
243 | }}; |
244 | std::function<Expr(Expr &&)> ne{[&result](Expr &&right) { |
245 | return Expr{Expr::NE(std::move(result).value(), std::move(right))}; |
246 | }}; |
247 | std::function<Expr(Expr &&)> ge{[&result](Expr &&right) { |
248 | return Expr{Expr::GE(std::move(result).value(), std::move(right))}; |
249 | }}; |
250 | std::function<Expr(Expr &&)> gt{[&result](Expr &&right) { |
251 | return Expr{Expr::GT(std::move(result).value(), std::move(right))}; |
252 | }}; |
253 | auto more{attempt( |
254 | sourced((".LT."_tok|| "<"_tok) >> applyLambda(lt, level3Expr) || |
255 | (".LE."_tok|| "<="_tok) >> applyLambda(le, level3Expr) || |
256 | (".EQ."_tok|| "=="_tok) >> applyLambda(eq, level3Expr) || |
257 | (".NE."_tok|| "/="_tok|| |
258 | extension<LanguageFeature::AlternativeNE>( |
259 | "nonstandard usage: <> for /= or .NE."_port_en_US, |
260 | "<>"_tok/* PGI/Cray extension; Cray also has .LG. */)) >> |
261 | applyLambda(ne, level3Expr) || |
262 | (".GE."_tok|| ">="_tok) >> applyLambda(ge, level3Expr) || |
263 | (".GT."_tok|| ">"_tok) >> applyLambda(gt, level3Expr)))}; |
264 | if (std::optional<Expr> next{more.Parse(state)}) { |
265 | next->source.ExtendToCover(source); |
266 | return next; |
267 | } |
268 | } |
269 | return result; |
270 | } |
271 | }; |
272 | constexpr Level4Expr level4Expr; |
273 | |
274 | // R1014 and-operand -> [not-op] level-4-expr |
275 | // R1018 not-op -> .NOT. |
276 | // N.B. Fortran's .NOT. binds less tightly than its comparison operators do. |
277 | // PGI/Intel extension: accept multiple .NOT. operators |
278 | struct AndOperand { |
279 | using resultType = Expr; |
280 | constexpr AndOperand() {} |
281 | static inline std::optional<Expr> Parse(ParseState &); |
282 | }; |
283 | constexpr AndOperand andOperand; |
284 | |
285 | // Match a logical operator or, optionally, its abbreviation. |
286 | inline constexpr auto logicalOp(const char *op, const char *abbrev) { |
287 | return TokenStringMatch{op} || |
288 | extension<LanguageFeature::LogicalAbbreviations>( |
289 | "nonstandard usage: abbreviated LOGICAL operator"_port_en_US, |
290 | TokenStringMatch{abbrev}); |
291 | } |
292 | |
293 | inline std::optional<Expr> AndOperand::Parse(ParseState &state) { |
294 | static constexpr auto notOp{attempt(logicalOp(op: ".NOT.", abbrev: ".N.") >> andOperand)}; |
295 | if (std::optional<Expr> negation{notOp.Parse(state)}) { |
296 | return Expr{Expr::NOT{std::move(*negation)}}; |
297 | } else { |
298 | return level4Expr.Parse(state); |
299 | } |
300 | } |
301 | |
302 | // R1015 or-operand -> [or-operand and-op] and-operand |
303 | // R1019 and-op -> .AND. |
304 | // .AND. is left-associative |
305 | struct OrOperand { |
306 | using resultType = Expr; |
307 | constexpr OrOperand() {} |
308 | static inline std::optional<Expr> Parse(ParseState &state) { |
309 | static constexpr auto operand{sourced(andOperand)}; |
310 | std::optional<Expr> result{operand.Parse(state)}; |
311 | if (result) { |
312 | auto source{result->source}; |
313 | std::function<Expr(Expr &&)> logicalAnd{[&result](Expr &&right) { |
314 | return Expr{Expr::AND(std::move(result).value(), std::move(right))}; |
315 | }}; |
316 | auto more{attempt(sourced( |
317 | logicalOp(op: ".AND.", abbrev: ".A.") >> applyLambda(logicalAnd, andOperand)))}; |
318 | while (std::optional<Expr> next{more.Parse(state)}) { |
319 | result = std::move(next); |
320 | result->source.ExtendToCover(source); |
321 | } |
322 | } |
323 | return result; |
324 | } |
325 | }; |
326 | constexpr OrOperand orOperand; |
327 | |
328 | // R1016 equiv-operand -> [equiv-operand or-op] or-operand |
329 | // R1020 or-op -> .OR. |
330 | // .OR. is left-associative |
331 | struct EquivOperand { |
332 | using resultType = Expr; |
333 | constexpr EquivOperand() {} |
334 | static inline std::optional<Expr> Parse(ParseState &state) { |
335 | std::optional<Expr> result{orOperand.Parse(state)}; |
336 | if (result) { |
337 | auto source{result->source}; |
338 | std::function<Expr(Expr &&)> logicalOr{[&result](Expr &&right) { |
339 | return Expr{Expr::OR(std::move(result).value(), std::move(right))}; |
340 | }}; |
341 | auto more{attempt(sourced( |
342 | logicalOp(op: ".OR.", abbrev: ".O.") >> applyLambda(logicalOr, orOperand)))}; |
343 | while (std::optional<Expr> next{more.Parse(state)}) { |
344 | result = std::move(next); |
345 | result->source.ExtendToCover(source); |
346 | } |
347 | } |
348 | return result; |
349 | } |
350 | }; |
351 | constexpr EquivOperand equivOperand; |
352 | |
353 | // R1017 level-5-expr -> [level-5-expr equiv-op] equiv-operand |
354 | // R1021 equiv-op -> .EQV. | .NEQV. |
355 | // Logical equivalence is left-associative. |
356 | // Extension: .XOR. as synonym for .NEQV. |
357 | struct Level5Expr { |
358 | using resultType = Expr; |
359 | constexpr Level5Expr() {} |
360 | static inline std::optional<Expr> Parse(ParseState &state) { |
361 | std::optional<Expr> result{equivOperand.Parse(state)}; |
362 | if (result) { |
363 | auto source{result->source}; |
364 | std::function<Expr(Expr &&)> eqv{[&result](Expr &&right) { |
365 | return Expr{Expr::EQV(std::move(result).value(), std::move(right))}; |
366 | }}; |
367 | std::function<Expr(Expr &&)> neqv{[&result](Expr &&right) { |
368 | return Expr{Expr::NEQV(std::move(result).value(), std::move(right))}; |
369 | }}; |
370 | auto more{attempt(sourced(".EQV.">> applyLambda(eqv, equivOperand) || |
371 | (".NEQV."_tok|| |
372 | extension<LanguageFeature::XOROperator>( |
373 | "nonstandard usage: .XOR./.X. spelling of .NEQV."_port_en_US, |
374 | logicalOp(".XOR.", ".X."))) >> |
375 | applyLambda(neqv, equivOperand)))}; |
376 | while (std::optional<Expr> next{more.Parse(state)}) { |
377 | result = std::move(next); |
378 | result->source.ExtendToCover(source); |
379 | } |
380 | } |
381 | return result; |
382 | } |
383 | }; |
384 | constexpr Level5Expr level5Expr; |
385 | |
386 | // R1022 expr -> [expr defined-binary-op] level-5-expr |
387 | // Defined binary operators associate leftwards. |
388 | template <> std::optional<Expr> Parser<Expr>::Parse(ParseState &state) { |
389 | std::optional<Expr> result{level5Expr.Parse(state)}; |
390 | if (result) { |
391 | auto source{result->source}; |
392 | std::function<Expr(DefinedOpName &&, Expr &&)> defBinOp{ |
393 | [&result](DefinedOpName &&op, Expr &&right) { |
394 | return Expr{Expr::DefinedBinary( |
395 | std::move(op), std::move(result).value(), std::move(right))}; |
396 | }}; |
397 | auto more{attempt( |
398 | sourced(applyLambda<Expr>(defBinOp, definedOpName, level5Expr)))}; |
399 | while (std::optional<Expr> next{more.Parse(state)}) { |
400 | result = std::move(next); |
401 | result->source.ExtendToCover(source); |
402 | } |
403 | } |
404 | return result; |
405 | } |
406 | |
407 | // R1003 defined-unary-op -> . letter [letter]... . |
408 | // R1023 defined-binary-op -> . letter [letter]... . |
409 | // R1414 local-defined-operator -> defined-unary-op | defined-binary-op |
410 | // R1415 use-defined-operator -> defined-unary-op | defined-binary-op |
411 | // C1003 A defined operator must be distinct from logical literal constants |
412 | // and intrinsic operator names; this is handled by attempting their parses |
413 | // first, and by name resolution on their definitions, for best errors. |
414 | // N.B. The name of the operator is captured with the dots around it. |
415 | constexpr auto definedOpNameChar{letter || |
416 | extension<LanguageFeature::PunctuationInNames>( |
417 | "nonstandard usage: non-alphabetic character in defined operator"_port_en_US, |
418 | "$@"_ch)}; |
419 | TYPE_PARSER( |
420 | space >> construct<DefinedOpName>(sourced("."_ch>> |
421 | some(definedOpNameChar) >> construct<Name>() / "."_ch))) |
422 | |
423 | // R1028 specification-expr -> scalar-int-expr |
424 | TYPE_PARSER(construct<SpecificationExpr>(scalarIntExpr)) |
425 | |
426 | // R1032 assignment-stmt -> variable = expr |
427 | TYPE_CONTEXT_PARSER("assignment statement"_en_US, |
428 | construct<AssignmentStmt>(variable / "=", expr)) |
429 | |
430 | // R1033 pointer-assignment-stmt -> |
431 | // data-pointer-object [( bounds-spec-list )] => data-target | |
432 | // data-pointer-object ( bounds-remapping-list ) => data-target | |
433 | // proc-pointer-object => proc-target |
434 | // R1034 data-pointer-object -> |
435 | // variable-name | scalar-variable % data-pointer-component-name |
436 | // C1022 a scalar-variable shall be a data-ref |
437 | // C1024 a data-pointer-object shall not be a coindexed object |
438 | // R1038 proc-pointer-object -> proc-pointer-name | proc-component-ref |
439 | // |
440 | // A distinction can't be made at the time of the initial parse between |
441 | // data-pointer-object and proc-pointer-object, or between data-target |
442 | // and proc-target. |
443 | TYPE_CONTEXT_PARSER("pointer assignment statement"_en_US, |
444 | construct<PointerAssignmentStmt>(dataRef, |
445 | parenthesized(nonemptyList(Parser<BoundsRemapping>{})), "=>">> expr) || |
446 | construct<PointerAssignmentStmt>(dataRef, |
447 | defaulted(parenthesized(nonemptyList(Parser<BoundsSpec>{}))), |
448 | "=>">> expr)) |
449 | |
450 | // R1035 bounds-spec -> lower-bound-expr : |
451 | TYPE_PARSER(construct<BoundsSpec>(boundExpr / ":")) |
452 | |
453 | // R1036 bounds-remapping -> lower-bound-expr : upper-bound-expr |
454 | TYPE_PARSER(construct<BoundsRemapping>(boundExpr / ":", boundExpr)) |
455 | |
456 | // R1039 proc-component-ref -> scalar-variable % procedure-component-name |
457 | // C1027 the scalar-variable must be a data-ref without coindices. |
458 | TYPE_PARSER(construct<ProcComponentRef>(structureComponent)) |
459 | |
460 | // R1041 where-stmt -> WHERE ( mask-expr ) where-assignment-stmt |
461 | // R1045 where-assignment-stmt -> assignment-stmt |
462 | // R1046 mask-expr -> logical-expr |
463 | TYPE_CONTEXT_PARSER("WHERE statement"_en_US, |
464 | construct<WhereStmt>("WHERE">> parenthesized(logicalExpr), assignmentStmt)) |
465 | |
466 | // R1042 where-construct -> |
467 | // where-construct-stmt [where-body-construct]... |
468 | // [masked-elsewhere-stmt [where-body-construct]...]... |
469 | // [elsewhere-stmt [where-body-construct]...] end-where-stmt |
470 | TYPE_CONTEXT_PARSER("WHERE construct"_en_US, |
471 | construct<WhereConstruct>(statement(Parser<WhereConstructStmt>{}), |
472 | many(whereBodyConstruct), |
473 | many(construct<WhereConstruct::MaskedElsewhere>( |
474 | statement(Parser<MaskedElsewhereStmt>{}), |
475 | many(whereBodyConstruct))), |
476 | maybe(construct<WhereConstruct::Elsewhere>( |
477 | statement(Parser<ElsewhereStmt>{}), many(whereBodyConstruct))), |
478 | statement(Parser<EndWhereStmt>{}))) |
479 | |
480 | // R1043 where-construct-stmt -> [where-construct-name :] WHERE ( mask-expr ) |
481 | TYPE_CONTEXT_PARSER("WHERE construct statement"_en_US, |
482 | construct<WhereConstructStmt>( |
483 | maybe(name / ":"), "WHERE">> parenthesized(logicalExpr))) |
484 | |
485 | // R1044 where-body-construct -> |
486 | // where-assignment-stmt | where-stmt | where-construct |
487 | TYPE_PARSER(construct<WhereBodyConstruct>(statement(assignmentStmt)) || |
488 | construct<WhereBodyConstruct>(statement(whereStmt)) || |
489 | construct<WhereBodyConstruct>(indirect(whereConstruct))) |
490 | |
491 | // R1047 masked-elsewhere-stmt -> |
492 | // ELSEWHERE ( mask-expr ) [where-construct-name] |
493 | TYPE_CONTEXT_PARSER("masked ELSEWHERE statement"_en_US, |
494 | construct<MaskedElsewhereStmt>( |
495 | "ELSE WHERE">> parenthesized(logicalExpr), maybe(name))) |
496 | |
497 | // R1048 elsewhere-stmt -> ELSEWHERE [where-construct-name] |
498 | TYPE_CONTEXT_PARSER("ELSEWHERE statement"_en_US, |
499 | construct<ElsewhereStmt>("ELSE WHERE">> maybe(name))) |
500 | |
501 | // R1049 end-where-stmt -> ENDWHERE [where-construct-name] |
502 | TYPE_CONTEXT_PARSER("END WHERE statement"_en_US, |
503 | construct<EndWhereStmt>(recovery( |
504 | "END WHERE">> maybe(name), namedConstructEndStmtErrorRecovery))) |
505 | |
506 | // R1050 forall-construct -> |
507 | // forall-construct-stmt [forall-body-construct]... end-forall-stmt |
508 | TYPE_CONTEXT_PARSER("FORALL construct"_en_US, |
509 | construct<ForallConstruct>(statement(Parser<ForallConstructStmt>{}), |
510 | many(Parser<ForallBodyConstruct>{}), |
511 | statement(Parser<EndForallStmt>{}))) |
512 | |
513 | // R1051 forall-construct-stmt -> |
514 | // [forall-construct-name :] FORALL concurrent-header |
515 | TYPE_CONTEXT_PARSER("FORALL construct statement"_en_US, |
516 | construct<ForallConstructStmt>( |
517 | maybe(name / ":"), "FORALL">> indirect(concurrentHeader))) |
518 | |
519 | // R1052 forall-body-construct -> |
520 | // forall-assignment-stmt | where-stmt | where-construct | |
521 | // forall-construct | forall-stmt |
522 | TYPE_PARSER(construct<ForallBodyConstruct>(statement(forallAssignmentStmt)) || |
523 | construct<ForallBodyConstruct>(statement(whereStmt)) || |
524 | construct<ForallBodyConstruct>(whereConstruct) || |
525 | construct<ForallBodyConstruct>(indirect(forallConstruct)) || |
526 | construct<ForallBodyConstruct>(statement(forallStmt))) |
527 | |
528 | // R1053 forall-assignment-stmt -> assignment-stmt | pointer-assignment-stmt |
529 | TYPE_PARSER(construct<ForallAssignmentStmt>(assignmentStmt) || |
530 | construct<ForallAssignmentStmt>(pointerAssignmentStmt)) |
531 | |
532 | // R1054 end-forall-stmt -> END FORALL [forall-construct-name] |
533 | TYPE_CONTEXT_PARSER("END FORALL statement"_en_US, |
534 | construct<EndForallStmt>(recovery( |
535 | "END FORALL">> maybe(name), namedConstructEndStmtErrorRecovery))) |
536 | |
537 | // R1055 forall-stmt -> FORALL concurrent-header forall-assignment-stmt |
538 | TYPE_CONTEXT_PARSER("FORALL statement"_en_US, |
539 | construct<ForallStmt>("FORALL">> indirect(concurrentHeader), |
540 | unlabeledStatement(forallAssignmentStmt))) |
541 | } // namespace Fortran::parser |
542 |
Definitions
- primary
- level1Expr
- MultOperand
- MultOperand
- standardMultOperand
- multOperand
- Parse
- AddOperand
- AddOperand
- Parse
- addOperand
- Level2Expr
- Level2Expr
- Parse
- level2Expr
- Level3Expr
- Level3Expr
- Parse
- level3Expr
- Level4Expr
- Level4Expr
- Parse
- level4Expr
- AndOperand
- AndOperand
- andOperand
- logicalOp
- Parse
- OrOperand
- OrOperand
- Parse
- orOperand
- EquivOperand
- EquivOperand
- Parse
- equivOperand
- Level5Expr
- Level5Expr
- Parse
- level5Expr
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