[caseKey]

Description

This type can be used as the key in a TreeMap to provide case sensitive map lookups. Normally, all Lasso string comparisons are non-case-sensitive which makes 'one' equal to 'ONE'. Storing both of those values in a map will result in them being interpreted as the same value, so the second inserted pair will replace the first. By using the TreeMap and caseKey types, 'one' and 'ONE' will be treated as distinct values. This caseKey type needs to be used as the key for the map when both inserting and finding. Also, this method will not work with the regular 'Map' type, since it will always convert its keys into strings. The TreeMap type will preserve the key's original type.

Sample Usage

treemap(caseKey('one')=1, caseKey('ONE')=2)->find(caseKey('ONE')); // found
treemap(caseKey('one')=1, caseKey('ONE')=2)->find(caseKey('oNe')); // not found
treemap(caseKey('one')=1, caseKey('ONE')=2)->find(caseKey('one')); // found

Source Code

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define_type('caseKey');
	local('str'='');
	define_tag('onCreate', -req='p');
		self->'str' = #p;
	/define_tag;
	define_tag('onCompare', -req='p');
		if (#p->isa('caseKey'));
			return: self->'str'->compare(#p->'str', -case);
		/if;
		return: self->'str'->compare(#p, -case);
	/define_tag;
	
	define_tag('onConvert');
		return: self->'str';
	/define_tag;
/define_type;

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