src/scan.h

   1 /*
   2  * Copyright 1993, 1995 Christopher Seiwald.
   3  *
   4  * This file is part of Jam - see jam.c for Copyright information.
   5  */
   6 /*
   7  * scan.h - the jam yacc scanner
   8  *
   9  * External functions:
  10  *
  11  *  yyerror(char *s) - print a parsing error message
  12  *  yyfparse(char *s) - scan include file s
  13  *  yylex() - parse the next token, returning its type
  14  *  yymode() - adjust lexicon of scanner
  15  *  yyparse() - declaration for yacc parser
  16  *  yyanyerrors() - indicate if any parsing errors occured
  17  *
  18  * The yymode() function is for the parser to adjust the lexicon of the
  19  * scanner.  Aside from normal keyword scanning, there is a mode to
  20  * handle action strings (look only for the closing }) and a mode to
  21  * ignore most keywords when looking for a punctuation keyword.  This
  22  * allows non-punctuation keywords to be used in lists without quoting.
  23  *
  24  * 11/04/02 (seiwald) - const-ing for string literals
  25  */
  26 #ifndef JAMH_SCAN_H
  27 #define JAMH_SCAN_H
  28
  29
  30 /*
  31  * token_t - value of a lexical token
  32  */
  33 typedef struct {
  34   int type;
  35   const char *string;
  36   int strlit; /* !0: don't do variable expansion in string */
  37   PARSE *parse;
  38   LIST *list;
  39   int number;
  40   int line;
  41   int pos;
  42   const char *file; // newstr()
  43 } token_t;
  44
  45 extern token_t yylval;
  46
  47 extern void yyerror (const token_t *tk, const char *s);
  48 extern void yyfparse (const char *s);
  49 extern int yylex (void);
  50
  51
  52 enum {
  53   SCAN_NORMAL, /* normal parsing */
  54   SCAN_STRING, /* look only for matching '}' */
  55   SCAN_PUNCT   /* only punctuation keywords */
  56 };
  57
  58 extern void yymode (int n);
  59
  60
  61 #endif