Grammar for fixed form fortran doesn't support exclamation mark comments

[friedc]

Many compilers support inline exclamation mark comments with fixed source form¹². Here an example for such comments is given¹

C Column Numbers:
C        1         2         3         4         5         6         7
C23456789012345678901234567890123456789012345678901234567890123456789012

!IBM* SOURCEFORM (FIXED)
      CHARACTER CHARSTR ; LOGICAL X          ! 2 statements on 1 line
      DO 10 I=1,10
        PRINT *,'this is the index',I  ! with an inline comment
10    CONTINUE
C
       CHARSTR="THIS IS A CONTINUED
     X CHARACTER STRING"
       ! There will be 38 blanks in the string between "CONTINUED"
       ! and "CHARACTER". You cannot have an inline comment on
       ! the initial line because it would be interpreted as part
       ! of CHARSTR (character context).
  100 PRINT *, IERROR
! The following debug lines are compiled as source lines if
! you use -qdlines
D     IF (I.EQ.IDEBUG.AND.
D    +    J.EQ.IDEBUG)     WRITE(6,*) IERROR
D     IF (I.EQ.
D    +  IDEBUG )
D    +  WRITE(6,*) INFO
       END

And here is another example²

c      Start expression analyzer 
       CHARACTER S, STACK*80 
       COMMON /PRMS/ N, S, STACK 
       ... 
*      Crack the expression:
       IF ( S .GE. '0' .AND. S .LE. '9' ) THEN ! EoL comment 
              CALL PUSH        ! Save on stack. EoL comment 
d             PRINT *, S       ! Debug comment & EoL comment 
       ELSE 
              CALL TOLOWER ! To lowercase EoL comment 
       END IF 
D      PRINT *, N!       Debug comment & EoL comment 
       ... 
C      Finished 
!       expression analyzer

Finally another publicly available example³ also uses this feature. All these examples are currently not correctly highlighted. Currently the highlight is incorrect⁴, which is fixed a PR⁵ which I sent to the upstream repository fortran.tmbundle⁶. However, I have not heard back from the authors of the upstream grammar and probably never will.

Footnotes

1. https://www.ibm.com/docs/en/xcafbg/9.0.0?topic=SS3KZ4_9.0.0/com.ibm.xlf111.bg.doc/xlflr/lines_source_formats.htm ↩ ↩²

2. https://docs.oracle.com/cd/E19957-01/805-4939/6j4m0vn6l/index.html ↩ ↩²

3. https://github.com/johannesgerer/jburkardt-f77/blob/master/triangulation/triangulation_prb.f#L3253-L3268 ↩

4. https://github-lightshow.herokuapp.com/?utf8=%E2%9C%93&scope=from-url&grammar_format=auto&grammar_url=https%3A%2F%2Fgithub.com%2Ftextmate%2Ffortran.tmbundle%2Fblob%2Fmaster%2FSyntaxes%2FFortran%2520-%2520Punchcard.tmLanguage&grammar_text=&code_source=from-url&code_url=https%3A%2F%2Fgithub.com%2Fjohannesgerer%2Fjburkardt-f77%2Fblob%2Fmaster%2Ftriangulation%2Ftriangulation_prb.f%23L3253-L3268&code= ↩

5. https://github-lightshow.herokuapp.com/?utf8=%E2%9C%93&scope=from-url&grammar_format=auto&grammar_url=https%3A%2F%2Fgithub.com%2Ffriedc%2Ffortran.tmbundle%2Fblob%2Fmaster%2FSyntaxes%2FFortran%2520-%2520Punchcard.tmLanguage&grammar_text=&code_source=from-url&code_url=https%3A%2F%2Fgithub.com%2Fjohannesgerer%2Fjburkardt-f77%2Fblob%2Fmaster%2Ftriangulation%2Ftriangulation_prb.f%23L3253-L3268&code= ↩

6. https://github.com/textmate/fortran.tmbundle/pull/27 ↩

[lildude]

Unfortunately there's little we can do about it short of replacing the grammar with a better maintained one that has the support you desire.

If you know of a better grammar, please open a PR to switch to replace the old with the new. The CONTRIBUTING.md has details in what you need to do.

Removing bug tag as this is not a Linguist bug.