(enscript.info.gz) Writing New Highlighting Definitions

(enscript.info.gz) The states Program
 
 Writing New Highlighting Definitions
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    The highlighting works in three separate phases.  First, the
 "highlighing rules" process the input stream and parse it into logical
 components.  The components are called "faces".  A face presents one
 logical component of the input language, for example, a keyword, a
 comment, etc..  The enscript's highlighting model defines the following
 faces:
 
 bold
 italic
 bold_italic
      Hard-coded faces for the bold, italic, and bold-italice text types.
      These faces define the exact presentation of the face font, so the
      style files have very little power in customizing their outlook.
      These faces should be avoided as much as possible.
 
 comment
      A comment, normally in a programming language.
 
 function_name
      A function name.  The function names are normally recognized from
      function definitions, not from an use of the function.
 
 variable_name
      A variable name.  The variable names are normally recognized from
      function, type, and variable definitions.
 
 keyword
      A reserved keyword.  Normally, all occurrences of the keywords are
      recognized.
 
 reference
      A reference to another location in a file or to another file or
      resource.  For example, in the C-language, the goto targets are
      references.
 
 string
      A string literal.
 
 builtin
      A builtin function or property.  Normally, all occurrences of the
      builtins are recognized.
 
 type
      A type specifier.  The types are normally recognized from function,
      type, and variable definitions.
 
    As the second step, the "output style" specifies how the faces are
 presented in the generated output.  Each face has the following
 properties:
 
 fontname
      The PostScript font name of the the font that is used for the face.
      This property is used only for the PostScript outputs.
 
 boldp
      A boolean flag which tells whether the face should be printed in
      bold font.  This property is used for all output languages except
      for the PostScript which uses the fontname property.
 
 italicp
      A boolean flag which tells whether the face shuold be printed with
      italic font.  This property is used for all output languages
      except for the PostScript which uses the fontname property.
 
 fg_color
      The foreground color of the face.
 
 bg_color
      The background color of the face.  This property is not
      implemented on all output languages.
 
    Finally, the "output language" describes how the faces and other
 text are presented in the output language.  The output language defines
 a set of functions which are called to generate the output.
(enscript.info.gz) Writing New Highlighting Definitions

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