35 lines
1.4 KiB
C
35 lines
1.4 KiB
C
/* $Header$ */
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/* As a starter, chars are divided into classes, according to which
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token they can be the start of.
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*/
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#define class(ch) (tkclass[ch])
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#define STSKIP 0 /* spaces and so on: skipped characters */
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#define STNL 1 /* newline character(s): update linenumber etc. */
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#define STGARB 2 /* garbage ascii character: not allowed */
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#define STDOT 3 /* '.' can start a number, or be a separate token */
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#define STCOMP 4 /* this one can start a compound token */
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#define STIDF 5 /* being the initial character of an identifier */
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#define STCHAR 6 /* the starter of a character constant */
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#define STSTR 7 /* the starter of a string */
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#define STNUM 8 /* the starter of a numeric constant */
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#define STEOI 9 /* End-Of-Information mark */
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#define STSIMP 10 /* this character can occur as token */
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/* But occurring inside a token is not an exclusive property,
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so we need 1 bit for each class.
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This is implemented as a collection of tables to speed up
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the decision whether a character has a special meaning.
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*/
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#define in_idf(ch) ((unsigned)ch < 0177 && inidf[ch])
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#define in_ext(ch) ((unsigned)ch < 0177 && inext[ch])
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#define is_oct(ch) ((unsigned)ch < 0177 && isoct[ch])
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#define is_dig(ch) ((unsigned)ch < 0177 && isdig[ch])
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#define is_hex(ch) ((unsigned)ch < 0177 && ishex[ch])
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#define is_token(ch) ((unsigned)ch < 0177 && istoken[ch])
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extern char tkclass[];
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extern char inidf[], isoct[], isdig[], ishex[], inext[], istoken[];
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