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    Perl language syntax highlighting troubles (bug or limitation ?)

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    • EkopalypseE
      Ekopalypse
      last edited by Ekopalypse

      or maybe this one might be even better
      (?s)(<<)\h+(["'])(\w+?)\2\h*;.*?\3

      1 Reply Last reply Reply Quote 1
      • Gilles MaisonneuveG
        Gilles Maisonneuve
        last edited by

        Can’t reply what I wanted, a robot says I’m spamming…

        Gilles MaisonneuveG 1 Reply Last reply Reply Quote 0
        • EkopalypseE
          Ekopalypse @Gilles Maisonneuve
          last edited by

          @Gilles-Maisonneuve

          Can’t reply what I wanted, a robot says I’m spamming…

          I have no idea why this happens sometimes.

          By the way, now that you have installed pythonscript plugin would you mind
          clicking Plugins->Python Script->Scripts->Samples->RegexTester ?

          I know not everyone is recommending it but, personally, I love it.

          1 Reply Last reply Reply Quote 1
          • Gilles MaisonneuveG
            Gilles Maisonneuve @Gilles Maisonneuve
            last edited by

            AFAIK, at least in Perl, ["|'] means double-quote OR pipre OR simple-quote, everything between square brakets is literal. Also true in “awk” and C regexp I think.
            I don’t know for Python.

            Gilles MaisonneuveG 1 Reply Last reply Reply Quote 1
            • Gilles MaisonneuveG
              Gilles Maisonneuve @Gilles Maisonneuve
              last edited by

              @Ekopalypse

              Now, if I say in Pyhton (attempt to transliterate from Perl) :

              (r'(?s)(\h*(<<)\h*["|']?([^"|^']+?)["|']?\h*;.*?\3)', [2])
              

              does it mean :

              1. form REGEXP
              2. do not match NL with DOT
              3. matches any horizontal blanks (0 or more), don’t make a group
              4. matches ‘<<’ make it a group
              5. matches any horizontal blanks (0 or more), don’t make a group
              6. matches 0 or 1 text quote (either double or single), no group
              7. matches a group of any chars not " nor ’ one or more time(s) (in perl it would be [^"'])
              8. matches 0 or 1 text quote (either double or single), no group
              9. possible blanks until semi-colon, semi-colon, then possible chars until NL

              BUT THEN, what does mean ?\3. I’m lost there.

              Gilles MaisonneuveG 1 Reply Last reply Reply Quote 0
              • Gilles MaisonneuveG
                Gilles Maisonneuve @Gilles Maisonneuve
                last edited by

                a slash m

                EkopalypseE 1 Reply Last reply Reply Quote 0
                • EkopalypseE
                  Ekopalypse
                  last edited by Ekopalypse

                  the r at the beginning just informs python that this is a raw string and
                  every char must be taken literally otherwise backslashes would be treated
                  as escapes under some circumstances.

                  The regex string is only this part

                  (?s)(\h*(<<)\h*["|']?([^"|^']+?)["|']?\h*;.*?\3)
                  

                  and I would say, but as said - not an regex expert at all,

                  (?s) means Dot matches newline characters
                  the first matching group is

                  (\h*(<<)\h*["|']?([^"|^']+?)["|']?\h*;.*?\3)
                  

                  the second

                  (<<)
                  

                  and the third must be

                  ([^"|^']+?)
                  

                  if I’m right.

                  \3 should be the same as $3 in perl

                  Gilles MaisonneuveG 1 Reply Last reply Reply Quote 1
                  • Gilles MaisonneuveG
                    Gilles Maisonneuve @Ekopalypse
                    last edited by Gilles Maisonneuve

                    @Ekopalypse

                    still confused: ([^"|^']+?) why a ‘?’ after the ‘+’ what’s for this ‘?’

                    and then \3 would mean the 3rd matching group (third ‘()’) but in Perl is used only in subsitutions. What is the use here ? There are only 2 groups in the regex (two blocks surrounded by parenthèses only.

                    EkopalypseE 1 Reply Last reply Reply Quote 0
                    • EkopalypseE
                      Ekopalypse @Gilles Maisonneuve
                      last edited by

                      @Gilles-Maisonneuve

                      maybe this picture makes it a little bit clearer

                      1 Reply Last reply Reply Quote 2
                      • EkopalypseE
                        Ekopalypse @Gilles Maisonneuve
                        last edited by Ekopalypse

                        @Gilles-Maisonneuve

                        still confused: ([^"|^']+?) why a ‘?’ after the ‘+’ what’s for this ‘?’

                        as less as possible - non-greedy

                        and then \3 would mean the 3rd matching group (third ‘()’) but in Perl is used only in >subsitutions. What is the use here ? There are only 2 groups in the regex (two blocks >surrounded by parenthèses only.

                        placeholder for what was found in match group 3, to find the EOT at the end

                        and there are 3 match groups or am I missing something??

                        Gilles MaisonneuveG 1 Reply Last reply Reply Quote 1
                        • Gilles MaisonneuveG
                          Gilles Maisonneuve @Ekopalypse
                          last edited by

                          @Ekopalypse

                          2 sets of parenteses only, where is the third set ?
                          so only 2 match groups

                          can you make this work :

                          no syntax error on the python console but absolutely no result, where is my bug ?

                          regexes[(3, (255,255,255))] = (r'(?s)(\s*(<<)\s*("{0,1}.+"{0,1})\s*;.*?\3)', [1])
                          
                          EkopalypseE 1 Reply Last reply Reply Quote 0
                          • EkopalypseE
                            Ekopalypse @Gilles Maisonneuve
                            last edited by Ekopalypse

                            @Gilles-Maisonneuve

                            [1] informs the python script, that only the results from sub match group 1 should be colored in white (255,255,255)
                            sub match group 1 is the result of (<<)

                            In order to make it painting all you can use [0]

                            I’m still confused about the 2 to 3 match groups.
                            Am I incorrect when saying that
                            (\s*(<<)\s*("{0,1}.+"{0,1})\s*;.*?\3)
                            (<<)
                            ("{0,1}.+"{0,1})
                            are three match groups?

                            Maybe the confusion comes from the fact that references matches within a
                            regular expression starts by 1 but python starts counting match results by 0.

                            Sorry, but I have to stay up early tomorrow and it is already 1am but I’m really
                            interested in solving our (mis)understanding today later (maybe in ~16-18hours)?

                            1 Reply Last reply Reply Quote 1
                            • Gilles MaisonneuveG
                              Gilles Maisonneuve
                              last edited by

                              ok, tomorrow is another day
                              ‘see’ you tomorrow.
                              have a good night.
                              g

                              1 Reply Last reply Reply Quote 1
                              • EkopalypseE
                                Ekopalypse
                                last edited by

                                you too - see you

                                Gilles MaisonneuveG 1 Reply Last reply Reply Quote 1
                                • Gilles MaisonneuveG
                                  Gilles Maisonneuve @Ekopalypse
                                  last edited by

                                  @Ekopalypse

                                  OK, so the

                                  (\s*(<<)\s*("{0,1}.+"{0,1})\s*;.*?\3)
                                  

                                  is a regex group, not a function call surrounded by parenthèses or a logical group provided by the ‘r’ keyword. My mistake.
                                  BUT THEN, it is possible in Python to enclose an instruction such as ?\3 which means (as far as I understood what you explained to me earlier) recursive reference to a regexp named ‘3’) ??? The ‘3’ name being given in the expression regexes[(3, (255,255,255))] is that correct ? SO you can reference an expression within itself while it has not be closed yet: the last parenthese of the expression 3 is after the \3). Is that what it means ?

                                  Python syntax is a bit complicated to me.

                                  Alan KilbornA 1 Reply Last reply Reply Quote 0
                                  • Alan KilbornA
                                    Alan Kilborn @Gilles Maisonneuve
                                    last edited by

                                    @Gilles-Maisonneuve said:

                                    Python syntax is a bit complicated to me

                                    It’s not Python syntax, it’s regular expression syntax. It’s just not Perl regular expression syntax. :)

                                    And, BTW, nobody in the history of the world, especially someone coming from a Perl background, has ever uttered the phrase you typed.

                                    Gilles MaisonneuveG 1 Reply Last reply Reply Quote 1
                                    • guy038G
                                      guy038
                                      last edited by guy038

                                      Hello @gilles-maisonneuve, @eko-palypse and All,

                                      Gilles, could you verify that the two lines, below, work, with yours Red, Green and Blue colors ?

                                      regexes[(3, (R,G,B))] = (r'(?s-i)(<<)(['"]?)(\w+?)\2\h*;.*?\3', [1])
                                      regexes[(4, (R,G,B))] = (r'(?s-i)(<<)\h+('|")(\w+?)\2\h*;.*?\3', [1,3])
                                      

                                      For these two regexes :

                                      • Group 1 = << = double inferior than sign

                                      • Group 2 = ['"]? = an optional single or double quote, for regex id 3

                                      • Group 2 = '|" = a mandatory single or double quote ,separated from the << characters with blank characters, for regex id 4

                                      • Group 3 = \w+? = the shortest area of word characters, after the << sign, between possible quotes
                                        and before a semicolon character ;, with possible blank characters, before and/or after the quote characters

                                      Notes :

                                      • In regex id 3, only the << string is highlighted ( Group 1 )

                                      • In regex id 4, the << and the text between quotes are highlighted ( Groups 1 and 3 )

                                      • I added the -i in-line modifier ( => (?s-i) leading syntax ) to be sure that the ending boundary of the block corresponds exactly with the text, between quotes ( search is sensitive to case ! )


                                      So my regex (?s-i)(<<)(['"]?)(\w+?)\2\h*;.*?\3 ( id 3 ) matches any of these six cases, below :

                                      $x=<<TEXT;
                                      Plain text here
                                      TEXT
                                      
                                      $x=<<'TEXT';
                                      Plain text here
                                      TEXT
                                      
                                      $x=<<"TEXT";
                                      Plain text here
                                      TEXT
                                      
                                      $x=<<TEXT ;
                                      Plain text here
                                      TEXT
                                      
                                      $x=<<'TEXT' ;
                                      Plain text here
                                      TEXT
                                      
                                      $x=<<"TEXT" ;
                                      Plain text here
                                      TEXT
                                      

                                      And my regex (?s-i)(<<)\h+('|")(\w+?)\2\h*;.*?\3 ( id 4 ) matches these 4 cases, below :

                                      $x=<< 'TEXT';
                                      Plain text here
                                      TEXT
                                      
                                      $x=<< "TEXT";
                                      Plain text here
                                      TEXT
                                      
                                      $x=<< 'TEXT' ;
                                      Plain text here
                                      TEXT
                                      
                                      $x=<< "TEXT" ;
                                      Plain text here
                                      TEXT
                                      

                                      Best Regards,

                                      guy038

                                      Gilles MaisonneuveG 2 Replies Last reply Reply Quote 3
                                      • Gilles MaisonneuveG
                                        Gilles Maisonneuve @guy038
                                        last edited by

                                        @guy038

                                        Hello Guy,

                                        Could not make it work, sorry.

                                        I mean:

                                        • added (replaced original ones) in the EnhancePerlLexer.py from Ekopalypse the following lines (according to what you gave me:

                                          regexes[(3, (224,0,0))] = (r’(?s-i)(<<)([‘"]?)(\w+?)\2\h*;.?\3’, [1])
                                          regexes[(4, (0,0,224))] = (r’(?s-i)(<<)\h+('|")(\w+?)\2\h
                                          ;.*?\3’, [1,3])

                                        • saved it and restarted npp

                                        • list itemstill have the same coloring, not working.

                                        BUT, good news:

                                        python console:
                                        Traceback (most recent call last):
                                        File "C:\Users\gm\AppData\Roaming\Notepad++\plugins\Config\PythonScript\scripts\startup.py", line 1, in <module>
                                            import EnhancePerlLexer
                                        File "C:\Users\gm\AppData\Roaming\Notepad++\plugins\Config\PythonScript\scripts\EnhancePerlLexer.py", line 36
                                            regexes[(3, (224,0,0))] = (r'(?s-i)(<<)(['"]?)(\w+?)\2\h*;.*?\3', [1])
                                                                                                                ^
                                        SyntaxError: EOL while scanning string literal
                                        Python 2.7.15 (v2.7.15:ca079a3ea3, Apr 30 2018, 16:30:26) [MSC v.1500 64 bit (AMD64)]
                                        Initialisation took 110ms
                                        Ready.
                                        

                                        Can you tell me what did I did wrong ?
                                        (When I comment out the two lines I get back a valid coloring for the ‘q*’ syntaxes (yes, forgot to tell you, this had vanished too…)

                                        1 Reply Last reply Reply Quote 1
                                        • Gilles MaisonneuveG
                                          Gilles Maisonneuve @guy038
                                          last edited by

                                          @guy038

                                          Well, I commented out the rule 3 and kept rule 4.
                                          Same kind of error:

                                           regexes[(4, (0,0,224))] = (r'(?s-i)(<<)\h+('|")(\w+?)\2\h*;.*?\3', [1,3])
                                                                                                                  ^
                                           SyntaxError: EOL while scanning string literal
                                          
                                          Gilles MaisonneuveG 1 Reply Last reply Reply Quote 0
                                          • Gilles MaisonneuveG
                                            Gilles Maisonneuve @Gilles Maisonneuve
                                            last edited by

                                            if I modify the rule like:

                                            regexes[(4, (0,0,224))] = (r'(?s-i)((<<)\h+([\'"])(\w+?)\2\h*;.*?\3)', [1,3])
                                            

                                            I don’t get any longer a syntax error in Python BUT I get no coloring for the here doc either…

                                            Any idea ?

                                            1 Reply Last reply Reply Quote 0
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