projects/pdf.lang

   1 -- vim: set ft=lua ts=2 sw=2 et :
   2 -- Language definition for PDF files
   3 -- Author: Roland Hieber <rohieb@rohieb.name>
   4 -- Date: 2013-11-22
   5 -- Known Bugs:
   6 --  * Does not highlight files with MacOS (CR-only) line endings
   7 --  * Does not (yet) highlight inside streams due to limitations in the library
   8 --
   9
  10 Description="Highlighting definitions for the Portable Document Format (PDF)"
  11
  12 IgnoreCase=false
  13
  14 -- File Structure
  15 PreProcessor={
  16   Prefix=[[%PDF-[0-9]\.[0-9]|%%EOF|xref|startxref|trailer]]
  17 }
  18
  19 -- Comments. But do not match file structure elements.
  20 Comments={
  21   { Block=false,
  22     Delimiter={ [[%(?!PDF-[0-9]\.[0-9]|%EOF)]] },
  23   },
  24 }
  25
  26 -- Numbers: 0.45, +1.34, -.4, 123, 4., and so on.
  27 Digits=[[ [-+]?\.[0-9]+|[-+]?[0-9]+\.?[0-9]* ]]
  28
  29 -- Strings: (string), <hex> and streams
  30 Strings={
  31   DelimiterPairs= {
  32     { Open=[[ \( ]], Close=[[ \) ]] },
  33     { Open=[[ < ]], Close=[[ > ]] },
  34     { Open=[[ ^stream ]], Close=[[ ^endstream ]], Raw=true },
  35   }
  36 }
  37
  38 -- Note: we highlight dictionary and array syntax as "keywords", so we have to
  39 -- include them in Identifiers. This definition basically matches the allowed
  40 -- characters for Names. Also, we do not want to match Numbers, Streams,
  41 -- References and file structure elements as identifiers
  42 Identifiers=[[ (?!%PDF-[0-9]\.[0-9]|%%EOF|xref|startxref|trailer|[0-9]+\s+[0-9]+\s+(R|obj)|[-+]?\.[0-9]+|[-+]?[0-9]+\.?[0-9]*)[^\s\[\]\(\){}<>/%]+ ]]
  43
  44 Keywords={
  45   -- Indirect Objects
  46   { Id=1,
  47     Regex=[[ [0-9]+\s+[0-9]+\s+(obj|R)|endobj]],
  48     Group=0
  49   },
  50   -- Arrays and Dictionaries
  51   { Id=2,
  52     Regex=[[ \[|\]|<<|>> ]],
  53   },
  54   -- Names
  55   { Id=3,
  56     Regex=[[ /[^\s\[\]\(\){}<>/%]+ ]],
  57   },
  58   -- Constants
  59   { Id=4,
  60     --List={"true", "false", "null"},
  61     Regex=[[ true|false|null ]],
  62   },
  63 }