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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.

SEE ALSO

ParsePatternNoCase(), MatchPattern(), MatchFirst(), MatchNext()

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