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Docs » Autodocs » dos.library » ParsePattern

NAME

	ParsePattern -- Create a tokenized string for MatchPattern() (V36)

SYNOPSIS

	IsWild = ParsePattern(Source, Dest, DestLength)
	d0                      D1     D2      D3
	LONG ParsePattern(STRPTR, STRPTR, LONG)

FUNCTION

	Tokenizes a pattern, for use by MatchPattern().  Also indicates if
	there are any wildcards in the pattern (i.e. whether it might match
	more than one item).  Note that Dest must be at least 2 times as
	large as Source plus bytes to be (almost) 100% certain of no
	buffer overflow.  This is because each input character can currently
	expand to 2 tokens (with one exception that can expand to 3, but
	only once per string).  Note: this implementation may change in
	the future, so you should handle error returns in all cases, but
	the size above should still be a reasonable upper bound for a buffer
	allocation.
	The patterns are fairly extensive, and approximate some of the ability
	of Unix/grep "regular expression" patterns.  Here are the available
	tokens:
	?	Matches a single character.
	#	Matches the following expression 0 or more times.
	(ab|cd)	Matches any one of the items seperated by '|'.
	~	Negates the following expression.  It matches all strings
		that do not match the expression (aka ~(foo) matches all
		strings that are not exactly "foo").
	[abc]	Character class: matches any of the characters in the class.
	[~bc]	Character class: matches any of the characters not in the
		class.
	a-z	Character range (only within character classes). 
	%	Matches 0 characters always (useful in "(foo|bar|%)").
	*	Synonym for "#?", not available by default in 2.0.  Available
		as an option that can be turned on.
	"Expression" in the above table means either a single character
	(ex: "#?"), or an alternation (ex: "#(ab|cd|ef)"), or a character
	class (ex: "#[a-zA-Z]").

INPUTS

	source     - unparsed wildcard string to search for.
       dest       - output string, gets tokenized version of input.
	DestLength - length available in destination (should be at least as
		     twice as large as source + 2 bytes).

RESULT

	IsWild - 1 means there were wildcards in the pattern,
		 0 means there were no wildcards in the pattern,
		-1 means there was a buffer overflow or other error

BUGS

	In V37 this call didn't always set IoErr() to something useful on an
	error.  Fixed in V39.

NAME

SYNOPSIS

FUNCTION

INPUTS

RESULT

BUGS

SEE ALSO

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