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Top Forums Programming parsing fixed length field with yacc/bison Post 302280645 by otheus on Tuesday 27th of January 2009 10:27:43 AM
Old 01-27-2009
Generally, you don't specify token lengths.... yacc sees tokens, not strings. F/Lex sees strings and outputs tokens. So if you want tokens of specified length, do (in flex):
Code:
[a-zA-Z0-9_][a-zA-Z0-9_][a-zA-Z0-9_]    AlphaNumericSpecialOfLength3

(Pardon, but I forgot actual flex syntax)
 

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TOKEN_GET_ALL(3)							 1							  TOKEN_GET_ALL(3)

token_get_all - Split given source into PHP tokens

SYNOPSIS
array token_get_all (string $source) DESCRIPTION
token_get_all(3) parses the given $source string into PHP language tokens using the Zend engine's lexical scanner. For a list of parser tokens, see "List of Parser Tokens", or use token_name(3) to translate a token value into its string representation. PARAMETERS
o $source - The PHP source to parse. RETURN VALUES
An array of token identifiers. Each individual token identifier is either a single character (i.e.: ;, ., >, !, etc...), or a three ele- ment array containing the token index in element 0, the string content of the original token in element 1 and the line number in element 2. EXAMPLES
Example #1 token_get_all(3) examples <?php $tokens = token_get_all('<?php echo; ?>'); /* => array( array(T_OPEN_TAG, '<?php'), array(T_ECHO, 'echo'), ';', array(T_CLOSE_TAG, '?>') ); */ /* Note in the following example that the string is parsed as T_INLINE_HTML rather than the otherwise expected T_COMMENT (T_ML_COMMENT in PHP <5). This is because no open/close tags were used in the "code" provided. This would be equivalent to putting a comment outside of <?php ?> tags in a normal file. */ $tokens = token_get_all('/* comment */'); // => array(array(T_INLINE_HTML, '/* comment */')); ?> CHANGELOG
+--------+----------------------------------------+ |Version | | | | | | | Description | | | | +--------+----------------------------------------+ | 5.2.2 | | | | | | | Line numbers are returned in element 2 | | | | +--------+----------------------------------------+ PHP Documentation Group TOKEN_GET_ALL(3)
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