# tok.h | documentation

    #charset "us-ascii"
    #pragma once

    /*
     *   Copyright (c) 2000, 2006 Michael J. Roberts
     *
     *   This file is part of TADS 3
     *
     *   This header defines some macros for the standard tokenizer class.
     */

    /*
     *   token rule flags
     */

    /*
     *   The tokenizer's return value is a list of tokens.  Each token
     *   represented by a sublist describing the token.  These macros extract
     *   information from the token sublist.
     */

    /*
     *   Get the token value.  This is the parsed representation of the token;
     *   in most cases, this is simply the text of the original token, although
     *   it might be converted in some way (words are usually converted to
     *   lower-case, for example).
     */
    #define getTokVal(tok) ((tok)[1])

    /*
     *   Get the token type.  This is a token enum value describing the type of
     *   the token.
     */
    #define getTokType(tok) ((tok)[2])

    /*
     *   Get the token's original text.  This is the original text matched from
     *   the tokenized string.
     */
    #define getTokOrig(tok) ((tok)[3])

    /*
     *   Some internal convenience macros.  (These are meant for internal use
     *   within the tokenizer class, rather than for client code, but we define
     *   them here because they're also useful for subclasses of the standard
     *   tokenizer.)
     */
    #define tokRuleName(rule)   (rule[1])
    #define tokRulePat(rule)    (rule[2])
    #define tokRuleType(rule)   (rule[3])
    #define tokRuleVal(rule)    (rule[4])
    #define tokRuleTest(rule)   (rule[5])

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