1# Fortran 2018 Grammar
2
3Grammar used by Flang to parse Fortran 2018.
4
5```
6R0001 digit -> 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9
7R0002 letter ->
8        A | B | C | D | E | F | G | H | I | J | K | L | M |
9        N | O | P | Q | R | S | T | U | V | W | X | Y | Z
10R0003 rep-char
11
12R401 xzy-list -> xzy [, xzy]...
13R402 xzy-name -> name
14R403 scalar-xyz -> xyz
15
16R501 program -> program-unit [program-unit]...
17R502 program-unit ->
18       main-program | external-subprogram | module | submodule | block-data
19R503 external-subprogram -> function-subprogram | subroutine-subprogram
20R504 specification-part ->
21       [use-stmt]... [import-stmt]... [implicit-part]
22       [declaration-construct]...
23R505 implicit-part -> [implicit-part-stmt]... implicit-stmt
24R506 implicit-part-stmt ->
25       implicit-stmt | parameter-stmt | format-stmt | entry-stmt
26R507 declaration-construct ->
27       specification-construct | data-stmt | format-stmt | entry-stmt |
28       stmt-function-stmt
29R508 specification-construct ->
30       derived-type-def | enum-def | generic-stmt | interface-block |
31       parameter-stmt | procedure-declaration-stmt |
32       other-specification-stmt | type-declaration-stmt
33R509 execution-part -> executable-construct [execution-part-construct]...
34R510 execution-part-construct ->
35       executable-construct | format-stmt | entry-stmt | data-stmt
36R511 internal-subprogram-part -> contains-stmt [internal-subprogram]...
37R512 internal-subprogram -> function-subprogram | subroutine-subprogram
38R513 other-specification-stmt ->
39       access-stmt | allocatable-stmt | asynchronous-stmt | bind-stmt |
40       codimension-stmt | contiguous-stmt | dimension-stmt | external-stmt |
41       intent-stmt | intrinsic-stmt | namelist-stmt | optional-stmt |
42       pointer-stmt | protected-stmt | save-stmt | target-stmt |
43       volatile-stmt | value-stmt | common-stmt | equivalence-stmt
44R514 executable-construct ->
45       action-stmt | associate-construct | block-construct | case-construct |
46       change-team-construct | critical-construct | do-construct |
47       if-construct | select-rank-construct | select-type-construct |
48       where-construct | forall-construct
49R515 action-stmt ->
50       allocate-stmt | assignment-stmt | backspace-stmt | call-stmt |
51       close-stmt | continue-stmt | cycle-stmt | deallocate-stmt |
52       endfile-stmt | error-stop-stmt | event-post-stmt | event-wait-stmt |
53       exit-stmt | fail-image-stmt | flush-stmt | form-team-stmt |
54       goto-stmt | if-stmt | inquire-stmt | lock-stmt | nullify-stmt |
55       open-stmt | pointer-assignment-stmt | print-stmt | read-stmt |
56       return-stmt | rewind-stmt | stop-stmt | sync-all-stmt |
57       sync-images-stmt | sync-memory-stmt | sync-team-stmt | unlock-stmt |
58       wait-stmt | where-stmt | write-stmt | computed-goto-stmt | forall-stmt
59R516 keyword -> name
60
61R601 alphanumeric-character -> letter | digit | underscore  @ | $
62R602 underscore -> _
63R603 name -> letter [alphanumeric-character]...
64R604 constant -> literal-constant | named-constant
65R605 literal-constant ->
66       int-literal-constant | real-literal-constant |
67       complex-literal-constant | logical-literal-constant |
68       char-literal-constant | boz-literal-constant
69R606 named-constant -> name
70R607 int-constant -> constant
71R608 intrinsic-operator ->
72       power-op | mult-op | add-op | concat-op | rel-op |
73       not-op | and-op | or-op | equiv-op
74R609 defined-operator ->
75       defined-unary-op | defined-binary-op | extended-intrinsic-op
76R610 extended-intrinsic-op -> intrinsic-operator
77R611 label -> digit [digit]...
78R620 delimiter -> ( | ) | / | [ | ] | (/ | /)
79
80R701 type-param-value -> scalar-int-expr | * | :
81R702 type-spec -> intrinsic-type-spec | derived-type-spec
82R703 declaration-type-spec ->
83       intrinsic-type-spec | TYPE ( intrinsic-type-spec ) |
84       TYPE ( derived-type-spec ) | CLASS ( derived-type-spec ) |
85       CLASS ( * ) | TYPE ( * )
86R704 intrinsic-type-spec ->
87       integer-type-spec | REAL [kind-selector] | DOUBLE PRECISION |
88       COMPLEX [kind-selector] | CHARACTER [char-selector] |
89       LOGICAL [kind-selector] @ DOUBLE COMPLEX
90R705 integer-type-spec -> INTEGER [kind-selector]
91R706 kind-selector ->
92       ( [KIND =] scalar-int-constant-expr )  @ * scalar-int-constant-expr
93R707 signed-int-literal-constant -> [sign] int-literal-constant
94R708 int-literal-constant -> digit-string [_ kind-param]
95R709 kind-param -> digit-string | scalar-int-constant-name
96R710 signed-digit-string -> [sign] digit-string
97R711 digit-string -> digit [digit]...
98R712 sign -> + | -
99R713 signed-real-literal-constant -> [sign] real-literal-constant
100R714 real-literal-constant ->
101       significand [exponent-letter exponent] [_ kind-param] |
102       digit-string exponent-letter exponent [_ kind-param]
103R715 significand -> digit-string . [digit-string] | . digit-string
104R716 exponent-letter -> E | D  @ | Q
105R717 exponent -> signed-digit-string
106R718 complex-literal-constant -> ( real-part , imag-part )
107R719 real-part ->
108       signed-int-literal-constant | signed-real-literal-constant |
109       named-constant
110R720 imag-part ->
111       signed-int-literal-constant | signed-real-literal-constant |
112       named-constant
113R721 char-selector ->
114       length-selector |
115       ( LEN = type-param-value , KIND = scalar-int-constant-expr ) |
116       ( type-param-value , [KIND =] scalar-int-constant-expr ) |
117       ( KIND = scalar-int-constant-expr [, LEN = type-param-value] )
118R722 length-selector -> ( [LEN =] type-param-value ) | * char-length [,]
119R723 char-length -> ( type-param-value ) | digit-string
120R724 char-literal-constant ->
121       [kind-param _] ' [rep-char]... ' | [kind-param _] " [rep-char]... "
122R725 logical-literal-constant ->
123       .TRUE. [_ kind-param] | .FALSE. [_ kind-param] @ | .T. | .F.
124R726 derived-type-def ->
125       derived-type-stmt [type-param-def-stmt]... [private-or-sequence]...
126       [component-part] [type-bound-procedure-part] end-type-stmt
127R727 derived-type-stmt ->
128       TYPE [[, type-attr-spec-list] ::] type-name [( type-param-name-list )]
129R728 type-attr-spec ->
130       ABSTRACT | access-spec | BIND(C) | EXTENDS ( parent-type-name )
131R729 private-or-sequence -> private-components-stmt | sequence-stmt
132R730 end-type-stmt -> END TYPE [type-name]
133R731 sequence-stmt -> SEQUENCE
134R732 type-param-def-stmt ->
135       integer-type-spec , type-param-attr-spec :: type-param-decl-list
136R733 type-param-decl -> type-param-name [= scalar-int-constant-expr]
137R734 type-param-attr-spec -> KIND | LEN
138R735 component-part -> [component-def-stmt]...
139R736 component-def-stmt -> data-component-def-stmt | proc-component-def-stmt
140R737 data-component-def-stmt ->
141       declaration-type-spec [[, component-attr-spec-list] ::]
142       component-decl-list
143R738 component-attr-spec ->
144       access-spec | ALLOCATABLE |
145       CODIMENSION lbracket coarray-spec rbracket | CONTIGUOUS |
146       DIMENSION ( component-array-spec ) | POINTER
147R739 component-decl ->
148       component-name [( component-array-spec )]
149       [lbracket coarray-spec rbracket] [* char-length]
150       [component-initialization]
151R740 component-array-spec ->
152       explicit-shape-spec-list | deferred-shape-spec-list
153R741 proc-component-def-stmt ->
154       PROCEDURE ( [proc-interface] ) , proc-component-attr-spec-list ::
155        proc-decl-list
156R742 proc-component-attr-spec ->
157       access-spec | NOPASS | PASS [(arg-name)] | POINTER
158R743 component-initialization ->
159       = constant-expr | => null-init | => initial-data-target
160R744 initial-data-target -> designator
161R745 private-components-stmt -> PRIVATE
162R746 type-bound-procedure-part ->
163       contains-stmt [binding-private-stmt] [type-bound-proc-binding]...
164R747 binding-private-stmt -> PRIVATE
165R748 type-bound-proc-binding ->
166       type-bound-procedure-stmt | type-bound-generic-stmt |
167       final-procedure-stmt
168R749 type-bound-procedure-stmt ->
169       PROCEDURE [[, bind-attr-list] ::] type-bound-proc-decl-list |
170       PROCEDURE ( interface-name ) , bind-attr-list :: binding-name-list
171R750 type-bound-proc-decl -> binding-name [=> procedure-name]
172R751 type-bound-generic-stmt ->
173       GENERIC [, access-spec] :: generic-spec => binding-name-list
174R752 bind-attr ->
175       access-spec | DEFERRED | NON_OVERRIDABLE | NOPASS | PASS [(arg-name)]
176R753 final-procedure-stmt -> FINAL [::] final-subroutine-name-list
177R754 derived-type-spec -> type-name [(type-param-spec-list)]
178R755 type-param-spec -> [keyword =] type-param-value
179R756 structure-constructor -> derived-type-spec ( [component-spec-list] )
180R757 component-spec -> [keyword =] component-data-source
181R758 component-data-source -> expr | data-target | proc-target
182R759 enum-def ->
183       enum-def-stmt enumerator-def-stmt [enumerator-def-stmt]... end-enum-stmt
184R760 enum-def-stmt -> ENUM, BIND(C)
185R761 enumerator-def-stmt -> ENUMERATOR [::] enumerator-list
186R762 enumerator -> named-constant [= scalar-int-constant-expr]
187R763 end-enum-stmt -> END ENUM
188R764 boz-literal-constant -> binary-constant | octal-constant | hex-constant
189R765 binary-constant -> B ' digit [digit]... ' | B " digit [digit]... "
190R766 octal-constant -> O ' digit [digit]... ' | O " digit [digit]... "
191R767 hex-constant ->
192       Z ' hex-digit [hex-digit]... ' | Z " hex-digit [hex-digit]... "
193R768 hex-digit -> digit | A | B | C | D | E | F
194R769 array-constructor -> (/ ac-spec /) | lbracket ac-spec rbracket
195R770 ac-spec -> type-spec :: | [type-spec ::] ac-value-list
196R771 lbracket -> [
197R772 rbracket -> ]
198R773 ac-value -> expr | ac-implied-do
199R774 ac-implied-do -> ( ac-value-list , ac-implied-do-control )
200R775 ac-implied-do-control ->
201       [integer-type-spec ::] ac-do-variable = scalar-int-expr ,
202       scalar-int-expr [, scalar-int-expr]
203R776 ac-do-variable -> do-variable
204
205R801 type-declaration-stmt ->
206       declaration-type-spec [[, attr-spec]... ::] entity-decl-list
207R802 attr-spec ->
208       access-spec | ALLOCATABLE | ASYNCHRONOUS |
209       CODIMENSION lbracket coarray-spec rbracket | CONTIGUOUS |
210       DIMENSION ( array-spec ) | EXTERNAL | INTENT ( intent-spec ) |
211       INTRINSIC | language-binding-spec | OPTIONAL | PARAMETER |
212       POINTER | PROTECTED | SAVE | TARGET | VALUE | VOLATILE
213R803 entity-decl ->
214       object-name [( array-spec )] [lbracket coarray-spec rbracket]
215         [* char-length] [initialization] |
216       function-name [* char-length]
217R804 object-name -> name
218R805 initialization -> = constant-expr | => null-init | => initial-data-target
219R806 null-init -> function-reference     {constrained to be NULL()}
220R807 access-spec -> PUBLIC | PRIVATE
221R808 language-binding-spec ->
222       BIND ( C [, NAME = scalar-default-char-constant-expr] )
223R809 coarray-spec -> deferred-coshape-spec-list | explicit-coshape-spec
224R810 deferred-coshape-spec -> :
225R811 explicit-coshape-spec ->
226       [[lower-cobound :] upper-cobound ,]... [lower-cobound :] *
227R812 lower-cobound -> specification-expr
228R813 upper-cobound -> specification-expr
229R814 dimension-spec -> DIMENSION ( array-spec )
230R815 array-spec ->
231       explicit-shape-spec-list | assumed-shape-spec-list |
232       deferred-shape-spec-list | assumed-size-spec | implied-shape-spec |
233       implied-shape-or-assumed-size-spec | assumed-rank-spec
234R816 explicit-shape-spec -> [lower-bound :] upper-bound
235R817 lower-bound -> specification-expr
236R818 upper-bound -> specification-expr
237R819 assumed-shape-spec -> [lower-bound] :
238R820 deferred-shape-spec -> :
239R821 assumed-implied-spec -> [lower-bound :] *
240R822 assumed-size-spec -> explicit-shape-spec-list , assumed-implied-spec
241R823 implied-shape-or-assumed-size-spec -> assumed-implied-spec
242R824 implied-shape-spec -> assumed-implied-spec , assumed-implied-spec-list
243R825 assumed-rank-spec -> ..
244R826 intent-spec -> IN | OUT | INOUT
245R827 access-stmt -> access-spec [[::] access-id-list]
246R828 access-id -> access-name | generic-spec
247R829 allocatable-stmt -> ALLOCATABLE [::] allocatable-decl-list
248R830 allocatable-decl ->
249       object-name [( array-spec )] [lbracket coarray-spec rbracket]
250R831 asynchronous-stmt -> ASYNCHRONOUS [::] object-name-list
251R832 bind-stmt -> language-binding-spec [::] bind-entity-list
252R833 bind-entity -> entity-name | / common-block-name /
253R834 codimension-stmt -> CODIMENSION [::] codimension-decl-list
254R835 codimension-decl -> coarray-name lbracket coarray-spec rbracket
255R836 contiguous-stmt -> CONTIGUOUS [::] object-name-list
256R837 data-stmt -> DATA data-stmt-set [[,] data-stmt-set]...
257R838 data-stmt-set -> data-stmt-object-list / data-stmt-value-list /
258R839 data-stmt-object -> variable | data-implied-do
259R840 data-implied-do ->
260       ( data-i-do-object-list , [integer-type-spec ::]
261       data-i-do-variable = scalar-int-constant-expr ,
262       scalar-int-constant-expr [, scalar-int-constant-expr] )
263R841 data-i-do-object ->
264       array-element | scalar-structure-component | data-implied-do
265R842 data-i-do-variable -> do-variable
266R843 data-stmt-value -> [data-stmt-repeat *] data-stmt-constant
267R844 data-stmt-repeat -> scalar-int-constant | scalar-int-constant-subobject
268R845 data-stmt-constant ->
269       scalar-constant | scalar-constant-subobject |
270       signed-int-literal-constant | signed-real-literal-constant |
271       null-init | initial-data-target | structure-constructor
272R846 int-constant-subobject -> constant-subobject
273R847 constant-subobject -> designator
274R848 dimension-stmt ->
275       DIMENSION [::] array-name ( array-spec )
276       [, array-name ( array-spec )]...
277R849 intent-stmt -> INTENT ( intent-spec ) [::] dummy-arg-name-list
278R850 optional-stmt -> OPTIONAL [::] dummy-arg-name-list
279R851 parameter-stmt -> PARAMETER ( named-constant-def-list )
280R852 named-constant-def -> named-constant = constant-expr
281R853 pointer-stmt -> POINTER [::] pointer-decl-list
282R854 pointer-decl ->
283       object-name [( deferred-shape-spec-list )] | proc-entity-name
284R855 protected-stmt -> PROTECTED [::] entity-name-list
285R856 save-stmt -> SAVE [[::] saved-entity-list]
286R857 saved-entity -> object-name | proc-pointer-name | / common-block-name /
287R858 proc-pointer-name -> name
288R859 target-stmt -> TARGET [::] target-decl-list
289R860 target-decl ->
290       object-name [( array-spec )] [lbracket coarray-spec rbracket]
291R861 value-stmt -> VALUE [::] dummy-arg-name-list
292R862 volatile-stmt -> VOLATILE [::] object-name-list
293R863 implicit-stmt ->
294       IMPLICIT implicit-spec-list |
295       IMPLICIT NONE [( [implicit-name-spec-list] )]
296R864 implicit-spec -> declaration-type-spec ( letter-spec-list )
297R865 letter-spec -> letter [- letter]
298R866 implicit-name-spec -> EXTERNAL | TYPE
299R867 import-stmt ->
300       IMPORT [[::] import-name-list] | IMPORT , ONLY : import-name-list |
301       IMPORT , NONE | IMPORT , ALL
302R868 namelist-stmt ->
303       NAMELIST / namelist-group-name / namelist-group-object-list
304       [[,] / namelist-group-name / namelist-group-object-list]...
305R869 namelist-group-object -> variable-name
306R870 equivalence-stmt -> EQUIVALENCE equivalence-set-list
307R871 equivalence-set -> ( equivalence-object , equivalence-object-list )
308R872 equivalence-object -> variable-name | array-element | substring
309R873 common-stmt ->
310       COMMON [/ [common-block-name] /] common-block-object-list
311       [[,] / [common-block-name] / common-block-object-list]...
312R874 common-block-object -> variable-name [( array-spec )]
313
314R901 designator ->
315       object-name | array-element | array-section |
316       coindexed-named-object | complex-part-designator |
317       structure-component | substring
318R902 variable -> designator | function-reference
319R903 variable-name -> name
320R904 logical-variable -> variable
321R905 char-variable -> variable
322R906 default-char-variable -> variable
323R907 int-variable -> variable
324R908 substring -> parent-string ( substring-range )
325R909 parent-string ->
326       scalar-variable-name | array-element | coindexed-named-object |
327       scalar-structure-component | scalar-char-literal-constant |
328       scalar-named-constant
329R910 substring-range -> [scalar-int-expr] : [scalar-int-expr]
330R911 data-ref -> part-ref [% part-ref]...
331R912 part-ref -> part-name [( section-subscript-list )] [image-selector]
332R913 structure-component -> data-ref
333R914 coindexed-named-object -> data-ref
334R915 complex-part-designator -> designator % RE | designator % IM
335R916 type-param-inquiry -> designator % type-param-name
336R917 array-element -> data-ref
337R918 array-section ->
338       data-ref [( substring-range )] | complex-part-designator
339R919 subscript -> scalar-int-expr
340R920 section-subscript -> subscript | subscript-triplet | vector-subscript
341R921 subscript-triplet -> [subscript] : [subscript] [: stride]
342R922 stride -> scalar-int-expr
343R923 vector-subscript -> int-expr
344R924 image-selector ->
345       lbracket cosubscript-list [, image-selector-spec-list] rbracket
346R925 cosubscript -> scalar-int-expr
347R926 image-selector-spec ->
348       STAT = stat-variable | TEAM = team-value |
349       TEAM_NUMBER = scalar-int-expr
350R927 allocate-stmt ->
351       ALLOCATE ( [type-spec ::] allocation-list [, alloc-opt-list] )
352R928 alloc-opt ->
353       ERRMSG = errmsg-variable | MOLD = source-expr |
354       SOURCE = source-expr | STAT = stat-variable
355R929 stat-variable -> scalar-int-variable
356R930 errmsg-variable -> scalar-default-char-variable
357R931 source-expr -> expr
358R932 allocation ->
359       allocate-object [( allocate-shape-spec-list )]
360       [lbracket allocate-coarray-spec rbracket]
361R933 allocate-object -> variable-name | structure-component
362R934 allocate-shape-spec -> [lower-bound-expr :] upper-bound-expr
363R935 lower-bound-expr -> scalar-int-expr
364R936 upper-bound-expr -> scalar-int-expr
365R937 allocate-coarray-spec ->
366       [allocate-coshape-spec-list ,] [lower-bound-expr :] *
367R938 allocate-coshape-spec -> [lower-bound-expr :] upper-bound-expr
368R939 nullify-stmt -> NULLIFY ( pointer-object-list )
369R940 pointer-object -> variable-name | structure-component | proc-pointer-name
370R941 deallocate-stmt ->
371       DEALLOCATE ( allocate-object-list [, dealloc-opt-list] )
372R942 dealloc-opt -> STAT = stat-variable | ERRMSG = errmsg-variable
373
374R1001 primary ->
375        literal-constant | designator | array-constructor |
376        structure-constructor | function-reference | type-param-inquiry |
377        type-param-name | ( expr )
378R1002 level-1-expr -> [defined-unary-op] primary
379R1003 defined-unary-op -> . letter [letter]... .
380R1004 mult-operand -> level-1-expr [power-op mult-operand]
381R1005 add-operand -> [add-operand mult-op] mult-operand
382R1006 level-2-expr -> [[level-2-expr] add-op] add-operand
383R1007 power-op -> **
384R1008 mult-op -> * | /
385R1009 add-op -> + | -
386R1010 level-3-expr -> [level-3-expr concat-op] level-2-expr
387R1011 concat-op -> //
388R1012 level-4-expr -> [level-3-expr rel-op] level-3-expr
389R1013 rel-op ->
390        .EQ. | .NE. | .LT. | .LE. | .GT. | .GE. |
391        == | /= | < | <= | > | >=  @ | <>
392R1014 and-operand -> [not-op] level-4-expr
393R1015 or-operand -> [or-operand and-op] and-operand
394R1016 equiv-operand -> [equiv-operand or-op] or-operand
395R1017 level-5-expr -> [level-5-expr equiv-op] equiv-operand
396R1018 not-op -> .NOT.
397R1019 and-op -> .AND.
398R1020 or-op -> .OR.
399R1021 equiv-op -> .EQV. | .NEQV.
400R1022 expr -> [expr defined-binary-op] level-5-expr
401R1023 defined-binary-op -> . letter [letter]... .
402R1024 logical-expr -> expr
403R1025 default-char-expr -> expr
404R1026 int-expr -> expr
405R1027 numeric-expr -> expr
406R1028 specification-expr -> scalar-int-expr
407R1029 constant-expr -> expr
408R1030 default-char-constant-expr -> default-char-expr
409R1031 int-constant-expr -> int-expr
410R1032 assignment-stmt -> variable = expr
411R1033 pointer-assignment-stmt ->
412        data-pointer-object [( bounds-spec-list )] => data-target |
413        data-pointer-object ( bounds-remapping-list ) => data-target |
414        proc-pointer-object => proc-target
415R1034 data-pointer-object ->
416        variable-name | scalar-variable % data-pointer-component-name
417R1035 bounds-spec -> lower-bound-expr :
418R1036 bounds-remapping -> lower-bound-expr : upper-bound-expr
419R1037 data-target -> expr
420R1038 proc-pointer-object -> proc-pointer-name | proc-component-ref
421R1039 proc-component-ref -> scalar-variable % procedure-component-name
422R1040 proc-target -> expr | procedure-name | proc-component-ref
423R1041 where-stmt -> WHERE ( mask-expr ) where-assignment-stmt
424R1042 where-construct ->
425        where-construct-stmt [where-body-construct]...
426        [masked-elsewhere-stmt [where-body-construct]...]...
427        [elsewhere-stmt [where-body-construct]...] end-where-stmt
428R1043 where-construct-stmt -> [where-construct-name :] WHERE ( mask-expr )
429R1044 where-body-construct ->
430        where-assignment-stmt | where-stmt | where-construct
431R1045 where-assignment-stmt -> assignment-stmt
432R1046 mask-expr -> logical-expr
433R1047 masked-elsewhere-stmt -> ELSEWHERE ( mask-expr ) [where-construct-name]
434R1048 elsewhere-stmt -> ELSEWHERE [where-construct-name]
435R1049 end-where-stmt -> END WHERE [where-construct-name]
436R1050 forall-construct ->
437        forall-construct-stmt [forall-body-construct]... end-forall-stmt
438R1051 forall-construct-stmt ->
439        [forall-construct-name :] FORALL concurrent-header
440R1052 forall-body-construct ->
441        forall-assignment-stmt | where-stmt | where-construct |
442        forall-construct | forall-stmt
443R1053 forall-assignment-stmt -> assignment-stmt | pointer-assignment-stmt
444R1054 end-forall-stmt -> END FORALL [forall-construct-name]
445R1055 forall-stmt -> FORALL concurrent-header forall-assignment-stmt
446
447R1101 block -> [execution-part-construct]...
448R1102 associate-construct -> associate-stmt block end-associate-stmt
449R1103 associate-stmt ->
450        [associate-construct-name :] ASSOCIATE ( association-list )
451R1104 association -> associate-name => selector
452R1105 selector -> expr | variable
453R1106 end-associate-stmt -> END ASSOCIATE [associate-construct-name]
454R1107 block-construct ->
455        block-stmt [block-specification-part] block end-block-stmt
456R1108 block-stmt -> [block-construct-name :] BLOCK
457R1109 block-specification-part ->
458        [use-stmt]... [import-stmt]...
459        [[declaration-construct]... specification-construct]
460R1110 end-block-stmt -> END BLOCK [block-construct-name]
461R1111 change-team-construct -> change-team-stmt block end-change-team-stmt
462R1112 change-team-stmt ->
463        [team-construct-name :] CHANGE TEAM ( team-value
464        [, coarray-association-list] [, sync-stat-list] )
465R1113 coarray-association -> codimension-decl => selector
466R1114 end-change-team-stmt ->
467        END TEAM [( [sync-stat-list] )] [team-construct-name]
468R1115 team-value -> scalar-expr
469R1116 critical-construct -> critical-stmt block end-critical-stmt
470R1117 critical-stmt ->
471        [critical-construct-name :] CRITICAL [( [sync-stat-list] )]
472R1118 end-critical-stmt -> END CRITICAL [critical-construct-name]
473R1119 do-construct -> do-stmt block end-do
474R1120 do-stmt -> nonlabel-do-stmt | label-do-stmt
475R1121 label-do-stmt -> [do-construct-name :] DO label [loop-control]
476R1122 nonlabel-do-stmt -> [do-construct-name :] DO [loop-control]
477R1123 loop-control ->
478        [,] do-variable = scalar-int-expr , scalar-int-expr
479          [, scalar-int-expr] |
480        [,] WHILE ( scalar-logical-expr ) |
481        [,] CONCURRENT concurrent-header concurrent-locality
482R1124 do-variable -> scalar-int-variable-name
483R1125 concurrent-header ->
484        ( [integer-type-spec ::] concurrent-control-list [, scalar-mask-expr] )
485R1126 concurrent-control ->
486        index-name = concurrent-limit : concurrent-limit [: concurrent-step]
487R1127 concurrent-limit -> scalar-int-expr
488R1128 concurrent-step -> scalar-int-expr
489R1129 concurrent-locality -> [locality-spec]...
490R1130 locality-spec ->
491        LOCAL ( variable-name-list ) | LOCAL_INIT ( variable-name-list ) |
492        SHARED ( variable-name-list ) | DEFAULT ( NONE )
493R1131 end-do -> end-do-stmt | continue-stmt
494R1132 end-do-stmt -> END DO [do-construct-name]
495R1133 cycle-stmt -> CYCLE [do-construct-name]
496R1134 if-construct ->
497        if-then-stmt block [else-if-stmt block]... [else-stmt block]
498        end-if-stmt
499R1135 if-then-stmt -> [if-construct-name :] IF ( scalar-logical-expr ) THEN
500R1136 else-if-stmt -> ELSE IF ( scalar-logical-expr ) THEN [if-construct-name]
501R1137 else-stmt -> ELSE [if-construct-name]
502R1138 end-if-stmt -> END IF [if-construct-name]
503R1139 if-stmt -> IF ( scalar-logical-expr ) action-stmt
504R1140 case-construct -> select-case-stmt [case-stmt block]... end-select-stmt
505R1141 select-case-stmt -> [case-construct-name :] SELECT CASE ( case-expr )
506R1142 case-stmt -> CASE case-selector [case-construct-name]
507R1143 end-select-stmt -> END SELECT [case-construct-name]
508R1144 case-expr -> scalar-expr
509R1145 case-selector -> ( case-value-range-list ) | DEFAULT
510R1146 case-value-range ->
511        case-value | case-value : | : case-value | case-value : case-value
512R1147 case-value -> scalar-constant-expr
513R1148 select-rank-construct ->
514        select-rank-stmt [select-rank-case-stmt block]... end-select-rank-stmt
515R1149 select-rank-stmt ->
516        [select-construct-name :] SELECT RANK ( [associate-name =>] selector )
517R1150 select-rank-case-stmt ->
518        RANK ( scalar-int-constant-expr ) [select-construct-name] |
519        RANK ( * ) [select-construct-name] |
520        RANK DEFAULT [select-construct-name]
521R1151 end-select-rank-stmt -> END SELECT [select-construct-name]
522R1152 select-type-construct ->
523        select-type-stmt [type-guard-stmt block]... end-select-type-stmt
524R1153 select-type-stmt ->
525        [select-construct-name :] SELECT TYPE ( [associate-name =>] selector )
526R1154 type-guard-stmt ->
527        TYPE IS ( type-spec ) [select-construct-name] |
528        CLASS IS ( derived-type-spec ) [select-construct-name] |
529        CLASS DEFAULT [select-construct-name]
530R1155 end-select-type-stmt -> END SELECT [select-construct-name]
531R1156 exit-stmt -> EXIT [construct-name]
532R1157 goto-stmt -> GO TO label
533R1158 computed-goto-stmt -> GO TO ( label-list ) [,] scalar-int-expr
534R1159 continue-stmt -> CONTINUE
535R1160 stop-stmt -> STOP [stop-code] [, QUIET = scalar-logical-expr]
536R1161 error-stop-stmt -> ERROR STOP [stop-code] [, QUIET = scalar-logical-expr]
537R1162 stop-code -> scalar-default-char-expr | scalar-int-expr
538R1163 fail-image-stmt -> FAIL IMAGE
539R1164 sync-all-stmt -> SYNC ALL [( [sync-stat-list] )]
540R1165 sync-stat -> STAT = stat-variable | ERRMSG = errmsg-variable
541R1166 sync-images-stmt -> SYNC IMAGES ( image-set [, sync-stat-list] )
542R1167 image-set -> int-expr | *
543R1168 sync-memory-stmt -> SYNC MEMORY [( [sync-stat-list] )]
544R1169 sync-team-stmt -> SYNC TEAM ( team-value [, sync-stat-list] )
545R1170 event-post-stmt -> EVENT POST ( event-variable [, sync-stat-list] )
546R1171 event-variable -> scalar-variable
547R1172 event-wait-stmt -> EVENT WAIT ( event-variable [, event-wait-spec-list] )
548R1173 event-wait-spec -> until-spec | sync-stat
549R1174 until-spec -> UNTIL_COUNT = scalar-int-expr
550R1175 form-team-stmt ->
551        FORM TEAM ( team-number , team-variable [, form-team-spec-list] )
552R1176 team-number -> scalar-int-expr
553R1177 team-variable -> scalar-variable
554R1178 form-team-spec -> NEW_INDEX = scalar-int-expr | sync-stat
555R1179 lock-stmt -> LOCK ( lock-variable [, lock-stat-list] )
556R1180 lock-stat -> ACQUIRED_LOCK = scalar-logical-variable | sync-stat
557R1181 unlock-stmt -> UNLOCK ( lock-variable [, sync-stat-list] )
558R1182 lock-variable -> scalar-variable
559
560R1201 io-unit -> file-unit-number | * | internal-file-variable
561R1202 file-unit-number -> scalar-int-expr
562R1203 internal-file-variable -> char-variable
563R1204 open-stmt -> OPEN ( connect-spec-list )
564R1205 connect-spec ->
565        [UNIT =] file-unit-number | ACCESS = scalar-default-char-expr |
566        ACTION = scalar-default-char-expr |
567        ASYNCHRONOUS = scalar-default-char-expr |
568        BLANK = scalar-default-char-expr |
569        DECIMAL = scalar-default-char-expr | DELIM = scalar-default-char-expr |
570        ENCODING = scalar-default-char-expr | ERR = label |
571        FILE = file-name-expr | FORM = scalar-default-char-expr |
572        IOMSG = iomsg-variable | IOSTAT = scalar-int-variable |
573        NEWUNIT = scalar-int-variable | PAD = scalar-default-char-expr |
574        POSITION = scalar-default-char-expr | RECL = scalar-int-expr |
575        ROUND = scalar-default-char-expr | SIGN = scalar-default-char-expr |
576        STATUS = scalar-default-char-expr
577        @ | CARRIAGECONTROL = scalar-default-char-expr
578          | CONVERT = scalar-default-char-expr
579          | DISPOSE = scalar-default-char-expr
580R1206 file-name-expr -> scalar-default-char-expr
581R1207 iomsg-variable -> scalar-default-char-variable
582R1208 close-stmt -> CLOSE ( close-spec-list )
583R1209 close-spec ->
584        [UNIT =] file-unit-number | IOSTAT = scalar-int-variable |
585        IOMSG = iomsg-variable | ERR = label |
586        STATUS = scalar-default-char-expr
587R1210 read-stmt ->
588        READ ( io-control-spec-list ) [input-item-list] |
589        READ format [, input-item-list]
590R1211 write-stmt -> WRITE ( io-control-spec-list ) [output-item-list]
591R1212 print-stmt -> PRINT format [, output-item-list]
592R1213 io-control-spec ->
593        [UNIT =] io-unit | [FMT =] format | [NML =] namelist-group-name |
594        ADVANCE = scalar-default-char-expr |
595        ASYNCHRONOUS = scalar-default-char-constant-expr |
596        BLANK = scalar-default-char-expr | DECIMAL = scalar-default-char-expr |
597        DELIM = scalar-default-char-expr | END = label | EOR = label |
598        ERR = label | ID = id-variable | IOMSG = iomsg-variable |
599        IOSTAT = scalar-int-variable | PAD = scalar-default-char-expr |
600        POS = scalar-int-expr | REC = scalar-int-expr |
601        ROUND = scalar-default-char-expr | SIGN = scalar-default-char-expr |
602        SIZE = scalar-int-variable
603R1214 id-variable -> scalar-int-variable
604R1215 format -> default-char-expr | label | *
605R1216 input-item -> variable | io-implied-do
606R1217 output-item -> expr | io-implied-do
607R1218 io-implied-do -> ( io-implied-do-object-list , io-implied-do-control )
608R1219 io-implied-do-object -> input-item | output-item
609R1220 io-implied-do-control ->
610        do-variable = scalar-int-expr , scalar-int-expr [, scalar-int-expr]
611R1221 dtv-type-spec -> TYPE ( derived-type-spec ) | CLASS ( derived-type-spec )
612R1222 wait-stmt -> WAIT ( wait-spec-list )
613R1223 wait-spec ->
614        [UNIT =] file-unit-number | END = label | EOR = label | ERR = label |
615        ID = scalar-int-expr | IOMSG = iomsg-variable |
616        IOSTAT = scalar-int-variable
617R1224 backspace-stmt ->
618        BACKSPACE file-unit-number | BACKSPACE ( position-spec-list )
619R1225 endfile-stmt -> ENDFILE file-unit-number | ENDFILE ( position-spec-list )
620R1226 rewind-stmt -> REWIND file-unit-number | REWIND ( position-spec-list )
621R1227 position-spec ->
622        [UNIT =] file-unit-number | IOMSG = iomsg-variable |
623        IOSTAT = scalar-int-variable | ERR = label
624R1228 flush-stmt -> FLUSH file-unit-number | FLUSH ( flush-spec-list )
625R1229 flush-spec ->
626        [UNIT =] file-unit-number | IOSTAT = scalar-int-variable |
627        IOMSG = iomsg-variable | ERR = label
628R1230 inquire-stmt ->
629        INQUIRE ( inquire-spec-list ) |
630        INQUIRE ( IOLENGTH = scalar-int-variable ) output-item-list
631R1231 inquire-spec ->
632        [UNIT =] file-unit-number | FILE = file-name-expr |
633        ACCESS = scalar-default-char-variable |
634        ACTION = scalar-default-char-variable |
635        ASYNCHRONOUS = scalar-default-char-variable |
636        BLANK = scalar-default-char-variable |
637        DECIMAL = scalar-default-char-variable |
638        DELIM = scalar-default-char-variable |
639        ENCODING = scalar-default-char-variable |
640        ERR = label | EXIST = scalar-logical-variable |
641        FORM = scalar-default-char-variable |
642        FORMATTED = scalar-default-char-variable | ID = scalar-int-expr |
643        IOMSG = iomsg-variable | IOSTAT = scalar-int-variable |
644        NAME = scalar-default-char-variable |
645        NAMED = scalar-logical-variable | NEXTREC = scalar-int-variable |
646        NUMBER = scalar-int-variable | OPENED = scalar-logical-variable |
647        PAD = scalar-default-char-variable |
648        PENDING = scalar-logical-variable | POS = scalar-int-variable |
649        POSITION = scalar-default-char-variable |
650        READ = scalar-default-char-variable |
651        READWRITE = scalar-default-char-variable |
652        RECL = scalar-int-variable | ROUND = scalar-default-char-variable |
653        SEQUENTIAL = scalar-default-char-variable |
654        SIGN = scalar-default-char-variable | SIZE = scalar-int-variable |
655        STREAM = scalar-default-char-variable |
656        STATUS = scalar-default-char-variable |
657        WRITE = scalar-default-char-variable
658        @ | CARRIAGECONTROL = scalar-default-char-expr
659          | CONVERT = scalar-default-char-expr
660          | DISPOSE = scalar-default-char-expr
661
662R1301 format-stmt -> FORMAT format-specification
663R1302 format-specification ->
664        ( [format-items] ) | ( [format-items ,] unlimited-format-item )
665R1303 format-items -> format-item [[,] format-item]...
666R1304 format-item ->
667        [r] data-edit-desc | control-edit-desc | char-string-edit-desc | [r] ( format-items )
668R1305 unlimited-format-item -> * ( format-items )
669R1306 r -> digit-string
670R1307 data-edit-desc ->
671        I w [. m] | B w [. m] | O w [. m] | Z w [. m] | F w . d |
672        E w . d [E e] | EN w . d [E e] | ES w . d [E e] | EX w . d [E e] |
673        G w [. d [E e]] | L w | A [w] | D w . d |
674        DT [char-literal-constant] [( v-list )]
675R1308 w -> digit-string
676R1309 m -> digit-string
677R1310 d -> digit-string
678R1311 e -> digit-string
679R1312 v -> [sign] digit-string
680R1313 control-edit-desc ->
681        position-edit-desc | [r] / | : | sign-edit-desc | k P |
682        blank-interp-edit-desc | round-edit-desc | decimal-edit-desc |
683        @ $ | \
684R1314 k -> [sign] digit-string
685R1315 position-edit-desc -> T n | TL n | TR n | n X
686R1316 n -> digit-string
687R1317 sign-edit-desc -> SS | SP | S
688R1318 blank-interp-edit-desc -> BN | BZ
689R1319 round-edit-desc -> RU | RD | RZ | RN | RC | RP
690R1320 decimal-edit-desc -> DC | DP
691R1321 char-string-edit-desc -> char-literal-constant
692
693R1401 main-program ->
694        [program-stmt] [specification-part] [execution-part]
695        [internal-subprogram-part] end-program-stmt
696R1402 program-stmt -> PROGRAM program-name
697R1403 end-program-stmt -> END [PROGRAM [program-name]]
698R1404 module ->
699        module-stmt [specification-part] [module-subprogram-part]
700        end-module-stmt
701R1405 module-stmt -> MODULE module-name
702R1406 end-module-stmt -> END [MODULE [module-name]]
703R1407 module-subprogram-part -> contains-stmt [module-subprogram]...
704R1408 module-subprogram ->
705        function-subprogram | subroutine-subprogram |
706        separate-module-subprogram
707R1409 use-stmt ->
708        USE [[, module-nature] ::] module-name [, rename-list] |
709        USE [[, module-nature] ::] module-name , ONLY : [only-list]
710R1410 module-nature -> INTRINSIC | NON_INTRINSIC
711R1411 rename ->
712        local-name => use-name |
713        OPERATOR ( local-defined-operator ) =>
714          OPERATOR ( use-defined-operator )
715R1412 only -> generic-spec | only-use-name | rename
716R1413 only-use-name -> use-name
717R1414 local-defined-operator -> defined-unary-op | defined-binary-op
718R1415 use-defined-operator -> defined-unary-op | defined-binary-op
719R1416 submodule ->
720        submodule-stmt [specification-part] [module-subprogram-part]
721        end-submodule-stmt
722R1417 submodule-stmt -> SUBMODULE ( parent-identifier ) submodule-name
723R1418 parent-identifier -> ancestor-module-name [: parent-submodule-name]
724R1419 end-submodule-stmt -> END [SUBMODULE [submodule-name]]
725R1420 block-data -> block-data-stmt [specification-part] end-block-data-stmt
726R1421 block-data-stmt -> BLOCK DATA [block-data-name]
727R1422 end-block-data-stmt -> END [BLOCK DATA [block-data-name]]
728
729R1501 interface-block ->
730        interface-stmt [interface-specification]... end-interface-stmt
731R1502 interface-specification -> interface-body | procedure-stmt
732R1503 interface-stmt -> INTERFACE [generic-spec] | ABSTRACT INTERFACE
733R1504 end-interface-stmt -> END INTERFACE [generic-spec]
734R1505 interface-body ->
735        function-stmt [specification-part] end-function-stmt |
736        subroutine-stmt [specification-part] end-subroutine-stmt
737R1506 procedure-stmt -> [MODULE] PROCEDURE [::] specific-procedure-list
738R1507 specific-procedure -> procedure-name
739R1508 generic-spec ->
740        generic-name | OPERATOR ( defined-operator ) |
741        ASSIGNMENT ( = ) | defined-io-generic-spec
742R1509 defined-io-generic-spec ->
743        READ ( FORMATTED ) | READ ( UNFORMATTED ) |
744        WRITE ( FORMATTED ) | WRITE ( UNFORMATTED )
745R1510 generic-stmt ->
746        GENERIC [, access-spec] :: generic-spec => specific-procedure-list
747R1511 external-stmt -> EXTERNAL [::] external-name-list
748R1512 procedure-declaration-stmt ->
749        PROCEDURE ( [proc-interface] ) [[, proc-attr-spec]... ::]
750        proc-decl-list
751R1513 proc-interface -> interface-name | declaration-type-spec
752R1514 proc-attr-spec ->
753        access-spec | proc-language-binding-spec | INTENT ( intent-spec ) |
754        OPTIONAL | POINTER | PROTECTED | SAVE
755R1515 proc-decl -> procedure-entity-name [=> proc-pointer-init]
756R1516 interface-name -> name
757R1517 proc-pointer-init -> null-init | initial-proc-target
758R1518 initial-proc-target -> procedure-name
759R1519 intrinsic-stmt -> INTRINSIC [::] intrinsic-procedure-name-list
760R1520 function-reference -> procedure-designator ( [actual-arg-spec-list] )
761R1521 call-stmt -> CALL procedure-designator [( [actual-arg-spec-list] )]
762R1522 procedure-designator ->
763        procedure-name | proc-component-ref | data-ref % binding-name
764R1523 actual-arg-spec -> [keyword =] actual-arg
765R1524 actual-arg ->
766        expr | variable | procedure-name | proc-component-ref | alt-return-spec
767R1525 alt-return-spec -> * label
768R1526 prefix -> prefix-spec [prefix-spec]...
769R1527 prefix-spec ->
770        declaration-type-spec | ELEMENTAL | IMPURE | MODULE | NON_RECURSIVE |
771        PURE | RECURSIVE
772R1528 proc-language-binding-spec -> language-binding-spec
773R1529 function-subprogram ->
774        function-stmt [specification-part] [execution-part]
775        [internal-subprogram-part] end-function-stmt
776R1530 function-stmt ->
777        [prefix] FUNCTION function-name ( [dummy-arg-name-list] ) [suffix]
778R1531 dummy-arg-name -> name
779R1532 suffix ->
780        proc-language-binding-spec [RESULT ( result-name )] |
781        RESULT ( result-name ) [proc-language-binding-spec]
782R1533 end-function-stmt -> END [FUNCTION [function-name]]
783R1534 subroutine-subprogram ->
784        subroutine-stmt [specification-part] [execution-part]
785        [internal-subprogram-part] end-subroutine-stmt
786R1535 subroutine-stmt ->
787        [prefix] SUBROUTINE subroutine-name
788        [( [dummy-arg-list] ) [proc-language-binding-spec]]
789R1536 dummy-arg -> dummy-arg-name | *
790R1537 end-subroutine-stmt -> END [SUBROUTINE [subroutine-name]]
791R1538 separate-module-subprogram ->
792        mp-subprogram-stmt [specification-part] [execution-part]
793        [internal-subprogram-part] end-mp-subprogram-stmt
794R1539 mp-subprogram-stmt -> MODULE PROCEDURE procedure-name
795R1540 end-mp-subprogram-stmt -> END [PROCEDURE [procedure-name]]
796R1541 entry-stmt -> ENTRY entry-name [( [dummy-arg-list] ) [suffix]]
797R1542 return-stmt -> RETURN [scalar-int-expr]
798R1543 contains-stmt -> CONTAINS
799R1544 stmt-function-stmt ->
800        function-name ( [dummy-arg-name-list] ) = scalar-expr
801```
802