Info Catalog wisent: Writing a lexer wisent: Wisent Parsing wisent: Report errors

wisent: Actions goodies

 
 3.2 Variables and macros useful in grammar actions.
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  -- Variable: wisent-input
      The last token read.  This variable only has meaning in the scope
      of ‘wisent-parse’.
 
  -- Function: wisent-lexer
      Obtain the next terminal in input.
 
  -- Function: wisent-region &rest positions
      Return the start/end positions of the region including POSITIONS.
      Each element of POSITIONS is a pair ‘(START-POS .  END-POS)’ or
      ‘nil’.  The returned value is the pair
      ‘(MIN-START-POS . MAX-END-POS)’ or ‘nil’ if no POSITIONS are
      available.
 

Info Catalog wisent: Writing a lexer wisent: Wisent Parsing wisent: Report errors