postscript style for source-hightlight

[jeffz]

Hi                                                                                                                                          
                                                                                                                                           
I recently discovered source-highlight, it appears to be a very useful
program.                                                                                                                                    
                                                                                                                                           
However, when using the postscript.lang as a source language, it doesn't
handle % within strings (%) correctly.

eg, the following is treated as a comment and print is highlighted as
such, where instead because % is inside ( ) it should be treated as part
of a string. (%) print

I first tried adding "string = '\(.*\)'" to postscript.lang, this
suceeded in highlighting strings correctly, but % inside ( ) was still
making the rest of the line a comment.

I tried changing comment start "%" to comment start "(\(.*\))*(?=)%" but
this appears to be wrong, as source-highlight prints the following:

source-highlight: /usr/include/boost/shared_ptr.hpp:253: T*
boost::shared_ptr<T>::operator->() const [with T = RegExpFormatter]:
Assertion `px != 0' failed.
Aborted

Are there any gurus able to assist?

Original message:

Lorenzo Bettini wrote:
                                                                                                                                     
Dirk Jagdmann wrote:
Hello highlighters,

I have hacked together a style file for postscript files. It is attached
to this email. Use it along with the following lines in lang.map:
ps = postscript.lang
eps = postscript.lang

                                                                                                                             
Thanks a lot
Dirk! :-)                                                                                                                      
                                                                                                                                           
I'll add this file to the source-highlight distribution!

cheers                                                                                                                                      

Lorenzo                                                                                                                            
                                                                                                                                           
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[Lorenzo Bettini]

jeffz@... wrote:
> Hi                                                                                                                                          
>        

Hi Jeff and welcome to the list
 

> I recently discovered source-highlight, it appears to be a very useful
> program.                                                                                                                                    
>                                                                                                                                            
> However, when using the postscript.lang as a source language, it doesn't
> handle % within strings (%) correctly.
>

so (%) is to be considered as a string?
in particular everything between ( and ) should be considered as a string?

> eg, the following is treated as a comment and print is highlighted as
> such, where instead because % is inside ( ) it should be treated as part
> of a string. (%) print
>
> I first tried adding "string = '\(.*\)'" to postscript.lang, this
> suceeded in highlighting strings correctly, but % inside ( ) was still
> making the rest of the line a comment.

mhh... probably because your definition comes after the definition of %
comment?

>
> I tried changing comment start "%" to comment start "(\(.*\))*(?=)%" but
> this appears to be wrong, as source-highlight prints the following:
>
> source-highlight: /usr/include/boost/shared_ptr.hpp:253: T*
> boost::shared_ptr<T>::operator->() const [with T = RegExpFormatter]:
> Assertion `px != 0' failed.
> Aborted

yes probably this generates a regular expression that's wrong...

>
> Are there any gurus able to assist?
>

Although I don't know postscript I can try to fix this problem.

I'd need an input test file (in postscript) with % used in several
context, i.e., when it should be treated as a comment and some examples
of valid postscript strings (for instance, can ( ) strings be nested?
can ( or ) be escaped?)

hope to hear from you soon
cheers
        Lorenzo

P.S. yesterday I released 2.6 of source-highlight

--
Lorenzo Bettini, PhD in Computer Science, DSI, Univ. di Firenze
ICQ# lbetto, 16080134     (GNU/Linux User # 158233)
HOME: http://www.lorenzobettini.it MUSIC: http://www.purplesucker.com
BLOGS: http://tronprog.blogspot.com  http://longlivemusic.blogspot.com
http://www.gnu.org/software/src-highlite
http://www.gnu.org/software/gengetopt
http://www.gnu.org/software/gengen http://doublecpp.sourceforge.net


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[jeffz]

On Sat, Mar 24, 2007 at 11:20:24AM +0100, Lorenzo Bettini wrote:
> jeffz@... wrote:
> >Hi                                                                        
> >        
>
> Hi Jeff and welcome to the list
>

Thanks

> >I recently discovered source-highlight, it appears to be a very useful
> >program.                                                                  
> >                                                                                                                                            
> >However, when using the postscript.lang as a source language, it doesn't
> >handle % within strings (%) correctly.
> >
>
> so (%) is to be considered as a string?
> in particular everything between ( and ) should be considered as a string?

Yes

> >eg, the following is treated as a comment and print is highlighted as
> >such, where instead because % is inside ( ) it should be treated as part
> >of a string. (%) print
> >
> >I first tried adding "string = '\(.*\)'" to postscript.lang, this
> >suceeded in highlighting strings correctly, but % inside ( ) was still
> >making the rest of the line a comment.
>
> mhh... probably because your definition comes after the definition of %
> comment?

I put my string definition before the regular comment definition.
 

> >
> >I tried changing comment start "%" to comment start "(\(.*\))*(?=)%" but
> >this appears to be wrong, as source-highlight prints the following:
> >
> >source-highlight: /usr/include/boost/shared_ptr.hpp:253: T*
> >boost::shared_ptr<T>::operator->() const [with T = RegExpFormatter]:
> >Assertion `px != 0' failed.
> >Aborted
>
> yes probably this generates a regular expression that's wrong...
>
> >
> >Are there any gurus able to assist?
> >
>
> Although I don't know postscript I can try to fix this problem.
>
> I'd need an input test file (in postscript) with % used in several
> context, i.e., when it should be treated as a comment and some examples
> of valid postscript strings (for instance, can ( ) strings be nested?
> can ( or ) be escaped?)
>

According to the PostScript Language Reference manual, a comment is
defined as:

"Any occurrence of the character % outside a string introduces a comment.
The comment consists of all characters between the % and the next newline
or form feed, including regular, delimiter, space, and tab characters."

again, referring to the red book on strings:

"Literal Text Strings

A literal text string consists of an arbitrary number of characters
enclosed in ( and ). Any characters may appear in the string other than
(, ), and \, which must be treated specially. Balanced pairs of
parentheses in the string require no special treatment.

The following lines show several valid strings:
   (This is a string)
   (Strings may contain newlines
   and such.)
   (Strings may contain special characters *!&}^% and
   balanced parentheses ( ) (and so on).)
   (The following is an empty string.)
   ()
   (It has 0 (zero) length.)
Within a text string, the \ (backslash) character is treated as an
“escape” for various purposes, such as including newline characters,
unbalanced parentheses, and the \ character itself in the string."


In summary, an example of input would be.

% This is a comment
(This is a % (percent) inside a string)


> hope to hear from you soon
> cheers
> Lorenzo

Thanks for your quick reply

Jeff

> P.S. yesterday I released 2.6 of source-highlight
>
> --
> Lorenzo Bettini, PhD in Computer Science, DSI, Univ. di Firenze
> ICQ# lbetto, 16080134     (GNU/Linux User # 158233)
> HOME: http://www.lorenzobettini.it MUSIC: http://www.purplesucker.com
> BLOGS: http://tronprog.blogspot.com  http://longlivemusic.blogspot.com
> http://www.gnu.org/software/src-highlite
> http://www.gnu.org/software/gengetopt
> http://www.gnu.org/software/gengen http://doublecpp.sourceforge.net
>

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[Lorenzo Bettini]

Hi

this is my attempt, I attach the new postscript.lang definition

The only modification is this one:

environment string delim "(" ")" multiline nested begin
  specialchar = '\\.'
end

and an example of output (by the way, emacs does not highlight it
correctly ;-)

hope to hear from you soon
cheers
        Lorenzo

--
Lorenzo Bettini, PhD in Computer Science, DSI, Univ. di Firenze
ICQ# lbetto, 16080134     (GNU/Linux User # 158233)
HOME: http://www.lorenzobettini.it MUSIC: http://www.purplesucker.com
BLOGS: http://tronprog.blogspot.com  http://longlivemusic.blogspot.com
http://www.gnu.org/software/src-highlite
http://www.gnu.org/software/gengetopt
http://www.gnu.org/software/gengen http://doublecpp.sourceforge.net

# by Dirk Jagdmann, http://cubic.org/~doj

vardef ID = '[[:word:]]+'
variable = '/' + $ID

keyword = "abs|add|aload|anchorsearch|and|arc|arcn|arct|arcto|array|ashow|astore|atan|awidthshow",
        "begin|bind|bitshift|bytesavailable",
        "cachestatus|ceiling|charpath|clear|cleartomark|cleardictstack|clip|clippath|closefile|closepath|colorimage|concat|concatmatrix|condition|configurationerror|copy|copypage|cos|count|countdictstack|countexecstack|counttomark|cshow|currentblackgeneration|currentcacheparams|currentcmykcolor|currentcolor|currentcolorrendering|currentcolorscreen|currentcolorspace|currentcolortransfer|currentcontext|currentdash|currentdevparams|currentdict|currentfile|currentflat|currentfont|currentglobal|currentgray|currentgstate|currenthalftone|currenthalftonephase|currenthsbcolor|currentlinecap|currentlinejoin|currentlinewidth|currentmatrix|currentmiterlimit|currentobjectformat|currentpacking|currentpagedevice|currentpoint|currentrgbcolor|currentscreen|currentshared|currentstrokeadjust|currentsystemparams|currenttransfer|currentundercolorremoval|currentuserparams|curveto|cvi|cvlit|cvn|cvr|cvrs|cvs|cvx",
        "def|defaultmatrix|definefont|defineresource|defineusername|defineuserobject|deletefile|detach|deviceinfo|dict|dictfull|dictstack|dictstackoverflow|dictstackunderflow|div|dtransform|dup",
        "echo|eexec|end|eoclip|eofill|eoviewclip|eq|erasepage|errordict|exch|exec|execform|execstack|execstackoverflow|execuserobject|executeonly|executive|exit|exp",
        "false|file|filenameforall|fileposition|fill|filter|findencoding|findfont|findresource|flattenpath|floor|flush|flushfile|FontDirectory|for|forall|fork",
        "ge|get|getinterval|globaldict|GlobalFontDirectory|glyphshow|grestore|grestoreall|gsave|gstate|gt",
        "handleerror",
        "identmatrix|idiv|idtransform|if|ifelse|image|imagemask|index|ineofill|infill|initclip|initgraphics|initmatrix|initviewclip|instroke|internaldict|interrupt|inueofill|inufill|inustroke|invalidaccess|invalidcontext|invalidexit|invalidfileaccess|invalidfont|invalidid|invalidrestore|invertmatrix|ioerror|ISOLatin1Encoding|itransform",
        "join",
        "kshow|known",
        "languagelevel|le|length|limitcheck|lineto|ln|load|lock|log|loop|lt",
        "makefont|makepattern|mark|matrix|maxlength|mod|monitor|moveto|mul",
        "ne|neg|newpath|noaccess|nocurrentpoint|not|notify|null|nulldevice",
        "or",
        "packedarray|pathbbox|pathforall|pop|print|printobject|product|prompt|pstack|put|putinterval",
        "quit",
        "rand|rangecheck|rcurveto|read|readhexstring|readline|readonly|readstring|realtime|rectclip|rectfill|rectstroke|rectviewclip|renamefile|repeat|resetfile|resourceforall|resourcestatus|restore|reversepath|revision|rlineto|rmoveto|roll|rootfont|rotate|round|rrand|run",
        "save|scale|scalefont|scheck|search|selectfont|serialnumber|setbbox|setblackgeneration|setcachedevice|setcachedevice2|setcachelimit|setcacheparams|setcharwidth|setcmykcolor|setcolor|setcolorrendering|setcolorscreen|setcolorspace|setcolortransfer|setdash|setdevparams|setfileposition|setflat|setfont|setglobal|setgray|setgstate|sethalftone|sethalftonephase|sethsbcolor|setlinecap|setlinejoin|setlinewidth|setmatrix|setmiterlimit|setobjectformat|setoverprint|setpacking|setpagedevice|setpattern|setrgbcolor|setscreen|setshared|setstrokeadjust|setsystemparams|settransfer|setucacheparams|setundercolorremoval|setuserparams|setvmthreshold|shareddict|show|showpage|sin|sqrt|srand|stack|stackoverflow|stackunderflow|StandardEncoding|start|startjob|status|statusdict|stop|stopped|store|string|stringwidth|stroke|strokepath|sub|syntaxerror|systemdict",
        "timeout|transform|translate|true|truncate|type|typecheck|token",
        "uappend|ucache|ucachestatus|ueofill|ufill|undef|undefined|undefinedfilename|undefineresource|undefinedresult|undefinefont|undefineresource|undefinedresource|undefineuserobject|unmatchedmark|unregistered|upath|userdict|UserObjects|usertime|ustroke|ustrokepath",
        "version|viewclip|viewclippath|VMerror|vmreclaim|vmstatus",
        "wait|wcheck|where|widthshow|write|writehexstring|writeobject|writestring|wtranslation",
        "xcheck|xor|xshow|xyshow",
        "yield|yshow"

variable = $ID

environment string delim "(" ")" multiline nested begin
  specialchar = '\\.'
end

comment start "%"

include "number.lang"

symbol = "[","]","=","==","{","}","<<",">>"

%!
% a test for highlighting postscript files

% proc dotest => .
/dotest
  {
    dup
    mark
    exch
    stopped not % False if error, true if no error.
    { (Allowed access: ) print cleartomark == }
    if
    clear
  }
def

0 0 moveto % So the show commands don't bomb because of nocurrentpoint.

{ [1 2] executeonly aload }                                     dotest
{ (string) executeonly (seek) anchorsearch }                    dotest
{ (string) (seek) executeonly anchorsearch }                    dotest

(This is % a string)
{ [1 2] executeonly aload }
(This is a string with \( some escapes \( )
{ [1 2] executeonly aload }
(Strings may contain newlines 
and such.)
{ [1 2] executeonly aload }
(Strings may contain special characters *!&}^% and
balanced parentheses ( ) (and so on).)
{ [1 2] executeonly aload }
(The following is an empty string.)
{ [1 2] executeonly aload }
()
{ [1 2] executeonly aload }
(It has 0 (zero) length.)
{ [1 2] executeonly aload }

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[jeffz]

This appears to work perfectly, thank you :)

On Sun, Mar 25, 2007 at 10:29:01AM +0000, Lorenzo Bettini wrote:

> Hi
>
> this is my attempt, I attach the new postscript.lang definition
>
> The only modification is this one:
>
> environment string delim "(" ")" multiline nested begin
>   specialchar = '\\.'
> end
>
> and an example of output (by the way, emacs does not highlight it
> correctly ;-)

I submitted a bug report, though, I think I forgot to mention that
the issue was how it was highlighted in font-lock-mode.  I cc'd you
on that anyway.

Thanks again

Jeff

>
> hope to hear from you soon
> cheers
> Lorenzo
>
> --
> Lorenzo Bettini, PhD in Computer Science, DSI, Univ. di Firenze
> ICQ# lbetto, 16080134     (GNU/Linux User # 158233)
> HOME: http://www.lorenzobettini.it MUSIC: http://www.purplesucker.com
> BLOGS: http://tronprog.blogspot.com  http://longlivemusic.blogspot.com
> http://www.gnu.org/software/src-highlite
> http://www.gnu.org/software/gengetopt
> http://www.gnu.org/software/gengen http://doublecpp.sourceforge.net

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