scan.h

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/*
 * Copyright 1993, 1995 Christopher Seiwald.
 *
 * This file is part of Jam - see jam.c for Copyright information.
 */

/*
 * scan.h - the jam yacc scanner
 *
 * External functions:
 *
 *  yylex()     - parse the next token, returning its type
 *  yymode()    - adjust lexicon of scanner
 *  yyparse()   - declaration for yacc parser
 *  yyanyerrors() - indicate if any parsing errors occured
 *  yyerror( char *s )  - print a parsing error message
 *  yyfparse( char *s ) - scan include file s
 *
 * The yymode() function is for the parser to adjust the lexicon of the
 * scanner.  Aside from normal keyword scanning, there is a mode to
 * handle action strings (look only for the closing }) and a mode to 
 * ignore most keywords when looking for a punctuation keyword.  This 
 * allows non-punctuation keywords to be used in lists without quoting.
 *
 * Changes:
 *
 * 11/04/02 (seiwald) - const-ing for string literals
 */

/*
 * YYSTYPE - value of a lexical token
 */

# define YYSTYPE YYSYMBOL

typedef struct _YYSTYPE {
    int     type;
    const char  *string;
    PARSE       *parse;
    LIST        *list;
    int     number;
} YYSTYPE;

extern YYSTYPE yylval;

void yymode( int n );
void yyerror( const char *s );
int yyanyerrors();
void yyfparse( const char *s );
int yyline();
int yylex();
int yyparse();

# define SCAN_NORMAL    0   /* normal parsing */
# define SCAN_STRING    1   /* look only for matching } */
# define SCAN_PUNCT 2   /* only punctuation keywords */

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