proc removeComments { text {replacement ""} } {
regsub -all {[/][*].*?[*][/]} $text ${replacement} text
return $text
}If you need to remove C style comments that are imbedded (i.e. /* ... /* ... */ ... */) use the following procedure.
proc removeImbeddedComments { text {replacement ""} } {
set text [string map {"/*" \x80 "*/" \x81} $text]
while {[regsub -all {\x80[^\x80\x81]*?\x81} $text ${replacement} text]} {continue}
set text [string map {\x80 "/*" \x81 "*/"} $text]
return $text
}Use Examples:
removeComments ${data} "#comment-removed#"
removeImbeddedComments ${data} "#comment-removed#"Test Cases:
##### Simple Comments #####
# test-1
/**/
/* */
/* text1 */
# test-2
text1 /**/ text2 /* */ text3 /* comment */
# test-3
/*
*/
text1
/*
*/
text2
/*
*/
# test-4
text1 /*
*/ text2
text1 /*
*/ text2
# test-5
/* comment
*/
/*
comment
*/
/*
comment */
##### Imbedded Comments #####
# test-1
text1 /*/*/**/*/*/ text2
# test-2
text1 /*/**//**//*/**//**//**/*/*/ text2
# test-3
text1 /* comment /* comment /* comment */ comment */ comment */ text2
# test-4
text1
/*
text2
text3 /* comment */
text4 /*
comment
comment /* comment */
comment
*/
text5
*/
text5
# test-5
text1
/*
comment ///
/*
comment ///
/*
comment ///
comment ***
*/
comment ***
*/
comment ***
*/
text2
# test-6
text1 * / / *
/*
comment ///
/*
comment ///
/*
comment ///
comment ***
*/
comment ***
*/
comment ***
comment ///
/*
comment ///
/*
comment ///
comment ***
*/
comment ***
comment ///
/*
comment ///
comment ***
*/
comment ***
*/
comment ***
*/
text2
# test-7 (dangling comments)
*/ /*Test results from the removeImbeddedComments procedure were as follows.
##### Simple Comments #####
# test-1
#comment-removed#
#comment-removed#
#comment-removed#
# test-2
text1 #comment-removed# text2 #comment-removed# text3 #comment-removed#
# test-3
#comment-removed#
text1
#comment-removed#
text2
#comment-removed#
# test-4
text1 #comment-removed# text2
text1 #comment-removed# text2
# test-5
#comment-removed#
#comment-removed#
#comment-removed#
##### Imbedded Comments #####
# test-1
text1 #comment-removed# text2
# test-2
text1 #comment-removed# text2
# test-3
text1 #comment-removed# text2
# test-4
text1
#comment-removed#
text5
# test-5
text1
#comment-removed#
text2
# test-6
text1 * / / *
#comment-removed#
text2
# test-7 (dangling comments)
*/ /*Pierre Coueffin (03 Sept. 2005): You do have to be careful if you try to use this on actual comments in C code.if 0 {
removeComments {printf ("/* %s */\n", "Comment to print"); /* Prints a comment to stdout */}returns:
printf (" \n ", "Comment to print");where you might expect to see:
printf ("/* %s */\n", "Comment to print");}[tbtietc] - 2009-06-25 11:19:05
regsub -all {('([^\']|[\\].)')|("([^\"]|[\\].)*")|(//[^\n]*)|(/\*([^*]|[*][^/])*\*/)} $text "\\1\\3" text;This detects:A. Character in single quotes B. String in double quotes C. C style comments.And replaces:
A, B with themselves (quotes intact). C with null-string (comments deleted).
