package lexers

import (
	. "github.com/alecthomas/chroma/v2" // nolint
)

// FortranFixed lexer.
var FortranFixed = Register(MustNewLexer(
	&Config{
		Name:            "FortranFixed",
		Aliases:         []string{"fortranfixed"},
		Filenames:       []string{"*.f", "*.F"},
		MimeTypes:       []string{"text/x-fortran"},
		NotMultiline:    true,
		CaseInsensitive: true,
	},
	func() Rules {
		return Rules{
			"root": {
				{`[C*].*\n`, Comment, nil},
				{`#.*\n`, CommentPreproc, nil},
				{` {0,4}!.*\n`, Comment, nil},
				{`(.{5})`, NameLabel, Push("cont-char")},
				{`.*\n`, Using("Fortran"), nil},
			},
			"cont-char": {
				{` `, TextWhitespace, Push("code")},
				{`.`, GenericStrong, Push("code")},
			},
			"code": {
				{`(.{66})(.*)(\n)`, ByGroups(Using("Fortran"), Comment, TextWhitespace), Push("root")},
				{`(.*)(!.*)(\n)`, ByGroups(Using("Fortran"), Comment, TextWhitespace), Push("root")},
				{`(.*)(\n)`, ByGroups(Using("Fortran"), TextWhitespace), Push("root")},
				Default(Push("root")),
			},
		}
	},
))

package lexers

import (
	. "github.com/alecthomas/chroma/v2" // nolint
)

// FortranFixed lexer.
var FortranFixed = Register(MustNewLexer(
	&Config{
		Name:            "FortranFixed",
		Aliases:         []string{"fortranfixed"},
		Filenames:       []string{"*.f", "*.F"},
		MimeTypes:       []string{"text/x-fortran"},
		NotMultiline:    true,
		CaseInsensitive: true,
	},
	func() Rules {
		return Rules{
			"root": {
				{`[C*].*\n`, Comment, nil},
				{`#.*\n`, CommentPreproc, nil},
				{`[\t ]*!.*\n`, Comment, nil},
				{`(.{5})`, NameLabel, Push("cont-char")},
				{`.*\n`, Using("Fortran"), nil},
			},
			"cont-char": {
				{` `, Text, Push("code")},
				{`0`, Comment, Push("code")},
				{`.`, GenericStrong, Push("code")},
			},
			"code": {
				{`(.{66})(.*)(\n)`, ByGroups(Using("Fortran"), Comment, Text), Push("root")},
				{`.*\n`, Using("Fortran"), Push("root")},
				Default(Push("root")),
			},
		}
	},
))

--- 
+++ 
@@ -19,18 +19,18 @@
 			"root": {
 				{`[C*].*\n`, Comment, nil},
 				{`#.*\n`, CommentPreproc, nil},
-				{`[\t ]*!.*\n`, Comment, nil},
+				{` {0,4}!.*\n`, Comment, nil},
 				{`(.{5})`, NameLabel, Push("cont-char")},
 				{`.*\n`, Using("Fortran"), nil},
 			},
 			"cont-char": {
-				{` `, Text, Push("code")},
-				{`0`, Comment, Push("code")},
+				{` `, TextWhitespace, Push("code")},
 				{`.`, GenericStrong, Push("code")},
 			},
 			"code": {
-				{`(.{66})(.*)(\n)`, ByGroups(Using("Fortran"), Comment, Text), Push("root")},
-				{`.*\n`, Using("Fortran"), Push("root")},
+				{`(.{66})(.*)(\n)`, ByGroups(Using("Fortran"), Comment, TextWhitespace), Push("root")},
+				{`(.*)(!.*)(\n)`, ByGroups(Using("Fortran"), Comment, TextWhitespace), Push("root")},
+				{`(.*)(\n)`, ByGroups(Using("Fortran"), TextWhitespace), Push("root")},
 				Default(Push("root")),
 			},
 		}
Revise fortran fixed format lexer to recognize comments using the "!" mark in columns 1-5 and columns > 6.  Remove incorrect "0" label being a comment.