// // ICUTemplateMatcher.m // // Created by Matt Gemmell on 19/05/2008. // Copyright 2008 Instinctive Code. All rights reserved. // #import "ICUTemplateMatcher.h" #import "RegexKitLite.h" @implementation ICUTemplateMatcher + (ICUTemplateMatcher *)matcherWithTemplateEngine:(MGTemplateEngine *)theEngine { return [[[ICUTemplateMatcher alloc] initWithTemplateEngine:theEngine] autorelease]; } - (id)initWithTemplateEngine:(MGTemplateEngine *)theEngine { if (self = [super init]) { self.engine = theEngine; // weak ref } return self; } - (void)dealloc { self.engine = nil; self.templateString = nil; self.markerStart = nil; self.markerEnd = nil; self.exprStart = nil; self.exprEnd = nil; self.filterDelimiter = nil; self.regex = nil; [super dealloc]; } - (void)engineSettingsChanged { // This method is a good place to cache settings from the engine. self.markerStart = engine.markerStartDelimiter; self.markerEnd = engine.markerEndDelimiter; self.exprStart = engine.expressionStartDelimiter; self.exprEnd = engine.expressionEndDelimiter; self.filterDelimiter = engine.filterDelimiter; self.templateString = engine.templateContents; // Note: the \Q ... \E syntax causes everything inside it to be treated as literals. // This help us in the case where the marker/filter delimiters have special meaning // in regular expressions; notably the "$" character in the default marker start-delimiter. // Note: the (?m) syntax makes ICU enable multiline matching. NSString *basePattern = @"(\\Q%@\\E)(?:\\s+)?(.*?)(?:(?:\\s+)?\\Q%@\\E(?:\\s+)?(.*?))?(?:\\s+)?\\Q%@\\E"; NSString *mrkrPattern = [NSString stringWithFormat:basePattern, self.markerStart, self.filterDelimiter, self.markerEnd]; NSString *exprPattern = [NSString stringWithFormat:basePattern, self.exprStart, self.filterDelimiter, self.exprEnd]; self.regex = [NSString stringWithFormat:@"(?m)(?:%@|%@)", mrkrPattern, exprPattern]; } - (NSDictionary *)firstMarkerWithinRange:(NSRange)range { NSRange matchRange = [self.templateString rangeOfRegex:self.regex options:RKLNoOptions inRange:range capture:0 error:NULL]; NSMutableDictionary *markerInfo = nil; if (matchRange.length > 0) { markerInfo = [NSMutableDictionary dictionary]; [markerInfo setObject:[NSValue valueWithRange:matchRange] forKey:MARKER_RANGE_KEY]; // Found a match. Obtain marker string. NSString *matchString = [self.templateString substringWithRange:matchRange]; NSRange localRange = NSMakeRange(0, [matchString length]); //NSLog(@"mtch: \"%@\"", matchString); // Find type of match NSString *matchType = nil; NSRange mrkrSubRange = [matchString rangeOfRegex:regex options:RKLNoOptions inRange:localRange capture:1 error:NULL]; BOOL isMarker = (mrkrSubRange.length > 0); // only matches if match has marker-delimiters NSInteger offset = 0; if (isMarker) { matchType = MARKER_TYPE_MARKER; } else { matchType = MARKER_TYPE_EXPRESSION; offset = 3; } [markerInfo setObject:matchType forKey:MARKER_TYPE_KEY]; // Split marker string into marker-name and arguments. NSRange markerRange = NSMakeRange(0, [matchString length]); markerRange = [matchString rangeOfRegex:regex options:RKLNoOptions inRange:localRange capture:2 + offset error:NULL]; if (markerRange.length > 0) { NSString *markerString = [matchString substringWithRange:markerRange]; NSArray *markerComponents = [self argumentsFromString:markerString]; if (markerComponents && [markerComponents count] > 0) { [markerInfo setObject:[markerComponents objectAtIndex:0] forKey:MARKER_NAME_KEY]; NSInteger count = [markerComponents count]; if (count > 1) { [markerInfo setObject:[markerComponents subarrayWithRange:NSMakeRange(1, count - 1)] forKey:MARKER_ARGUMENTS_KEY]; } } // Check for filter. NSRange filterRange = [matchString rangeOfRegex:regex options:RKLNoOptions inRange:localRange capture:3 + offset error:NULL]; if (filterRange.length > 0) { // Found a filter. Obtain filter string. NSString *filterString = [matchString substringWithRange:filterRange]; // Convert first : plus any immediately-following whitespace into a space. localRange = NSMakeRange(0, [filterString length]); NSString *space = @" "; NSRange filterArgDelimRange = [filterString rangeOfRegex:@":(?:\\s+)?" options:RKLNoOptions inRange:localRange capture:0 error:NULL]; if (filterArgDelimRange.length > 0) { // Replace found text with space. filterString = [NSString stringWithFormat:@"%@%@%@", [filterString substringWithRange:NSMakeRange(0, filterArgDelimRange.location)], space, [filterString substringWithRange:NSMakeRange(NSMaxRange(filterArgDelimRange), localRange.length - NSMaxRange(filterArgDelimRange))]]; } // Split into filter-name and arguments. NSArray *filterComponents = [self argumentsFromString:filterString]; if (filterComponents && [filterComponents count] > 0) { [markerInfo setObject:[filterComponents objectAtIndex:0] forKey:MARKER_FILTER_KEY]; NSInteger count = [filterComponents count]; if (count > 1) { [markerInfo setObject:[filterComponents subarrayWithRange:NSMakeRange(1, count - 1)] forKey:MARKER_FILTER_ARGUMENTS_KEY]; } } } } } return markerInfo; } - (NSArray *)argumentsFromString:(NSString *)argString { // Extract arguments from argString, taking care not to break single- or double-quoted arguments, // including those containing \-escaped quotes. NSString *argsPattern = @"\"(.*?)(?<!\\\\)\"|'(.*?)(?<!\\\\)'|(\\S+)"; NSMutableArray *args = [NSMutableArray array]; NSInteger location = 0; while (location != NSNotFound) { NSRange searchRange = NSMakeRange(location, [argString length] - location); NSRange entireRange = [argString rangeOfRegex:argsPattern options:RKLNoOptions inRange:searchRange capture:0 error:NULL]; NSRange matchedRange = [argString rangeOfRegex:argsPattern options:RKLNoOptions inRange:searchRange capture:1 error:NULL]; if (matchedRange.length == 0) { matchedRange = [argString rangeOfRegex:argsPattern options:RKLNoOptions inRange:searchRange capture:2 error:NULL]; if (matchedRange.length == 0) { matchedRange = [argString rangeOfRegex:argsPattern options:RKLNoOptions inRange:searchRange capture:3 error:NULL]; } } location = NSMaxRange(entireRange) + ((entireRange.length == 0) ? 1 : 0); if (matchedRange.length > 0) { [args addObject:[argString substringWithRange:matchedRange]]; } else { location = NSNotFound; } } return args; } @synthesize engine; @synthesize markerStart; @synthesize markerEnd; @synthesize exprStart; @synthesize exprEnd; @synthesize filterDelimiter; @synthesize templateString; @synthesize regex; @end