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ccmode: AWK Mode Font Locking

 
 5.4 AWK Mode Font Locking
 =========================
 
 The general appearance of font-locking in AWK mode is much like in any
 other programming mode.  (elisp)Faces for Font Lock.
 
    The following faces are, however, used in a non-standard fashion in
 AWK mode:
 
 ‘font-lock-variable-name-face’
      This face was intended for variable declarations.  Since variables
      are not declared in AWK, this face is used instead for AWK system
      variables (such as ‘NF’) and “Special File Names” (such as
      ‘"/dev/stderr"’).
 
 ‘font-lock-builtin-face’ (Emacs)/‘font-lock-preprocessor-face’ (XEmacs)
      This face is normally used for preprocessor directives in CC Mode.
      There are no such things in AWK, so this face is used instead for
      standard functions (such as ‘match’).
 
 ‘font-lock-string-face’
      As well as being used for strings, including localizable strings,
      (delimited by ‘"’ and ‘_"’), this face is also used for AWK regular
      expressions (delimited by ‘/’).
 
 ‘font-lock-warning-face’ (Emacs)/‘c-invalid-face’ (XEmacs)
      This face highlights the following syntactically invalid AWK
      constructs:
 
         • An unterminated string or regular expression.  Here the
           opening delimiter (‘"’ or ‘/’ or ‘_"’) is displayed in
           ‘font-lock-warning-face’.  This is most noticeable when typing
           in a new string/regular expression into a buffer, when the
           warning-face serves as a continual reminder to terminate the
           construct.
 
           AWK mode fontifies unterminated strings/regular expressions
           differently from other modes: Only the text up to the end of
           the line is fontified as a string (escaped newlines being
           handled correctly), rather than the text up to the next string
           quote.
 
         • A space between the function name and opening parenthesis when
           calling a user function.  The last character of the function
           name and the opening parenthesis are highlighted.  This
           font-locking rule will spuriously highlight a valid
           concatenation expression where an identifier precedes a
           parenthesized expression.  Unfortunately.
 
         • Whitespace following the ‘\’ in what otherwise looks like an
           escaped newline.  The ‘\’ is highlighted.
 

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