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//
// TikzGraphAssembler.m
// TikZiT
//
// Copyright 2010 Aleks Kissinger. All rights reserved.
//
//
// This file is part of TikZiT.
//
// TikZiT is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// TikZiT is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with TikZiT. If not, see <http://www.gnu.org/licenses/>.
//
#import "TikzGraphAssembler.h"
#import "NSError+Tikzit.h"
extern int yyparse(void);
extern int yylex(void);
extern int yy_scan_string(const char* yy_str);
extern void yy_delete_buffer(int b);
extern int yylex_destroy(void);
static NSLock *parseLock = nil;
static id currentAssembler = nil;
void yyerror(const char *str) {
NSLog(@"Parse error: %s", str);
if (currentAssembler != nil) {
NSError *error = [NSError
errorWithMessage:[NSString stringWithCString:str]
code:TZ_ERR_PARSE];
[currentAssembler invalidateWithError:error];
}
}
int yywrap() {
return 1;
}
@implementation TikzGraphAssembler
- (id)init {
[super init];
graph = nil;
currentNode = nil;
currentEdge = nil;
nodeMap = nil;
return self;
}
- (Graph*)graph { return graph; }
- (NSError*)lastError { return lastError; }
- (GraphElementData *)data {
if (currentNode != nil) {
return [currentNode data];
} else if (currentEdge != nil) {
return [currentEdge data];
} else {
return [graph data];
}
}
- (Node*)currentNode { return currentNode; }
- (Edge*)currentEdge { return currentEdge; }
- (BOOL)parseTikz:(NSString *)tikz {
return [self parseTikz:tikz forGraph:[Graph graph]];
}
- (BOOL)parseTikz:(NSString*)tikz forGraph:(Graph*)gr {
[parseLock lock];
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
currentAssembler = self;
// set the current graph
if (graph != gr) {
[graph release];
graph = [gr retain];
}
// the node map keeps track of the mapping of names to nodes
nodeMap = [[NSMutableDictionary alloc] init];
// do the parsing
yy_scan_string([tikz UTF8String]);
yyparse();
yylex_destroy();
[nodeMap release];
nodeMap = nil;
currentAssembler = nil;
[pool drain];
[parseLock unlock];
return (graph != nil);
}
- (void)prepareNode {
currentNode = [[Node alloc] init];
}
- (void)finishNode {
if (currentEdge != nil) { // this is an edge node
[currentEdge setEdgeNode:currentNode];
} else { // this is a normal node
[graph addNode:currentNode];
[nodeMap setObject:currentNode forKey:[currentNode name]];
}
[currentNode release];
currentNode = nil;
}
- (void)prepareEdge {
currentEdge = [[Edge alloc] init];
}
- (void)finishEdge {
[currentEdge setAttributesFromData];
[graph addEdge:currentEdge];
[currentEdge release];
currentEdge = nil;
}
- (void)setEdgeSource:(NSString*)src target:(NSString*)targ {
if (![targ isEqualToString:@""]) {
[currentEdge setSource:[nodeMap objectForKey:src]];
[currentEdge setTarget:[nodeMap objectForKey:targ]];
} else {
Node *s = [nodeMap objectForKey:src];
[currentEdge setSource:s];
[currentEdge setTarget:s];
}
}
- (void)dealloc {
[graph release];
[lastError release];
[super dealloc];
}
- (void)invalidate {
[graph release];
graph = nil;
lastError = nil;
}
- (void)invalidateWithError:(NSError*)error {
[self invalidate];
lastError = [error retain];
}
+ (void)setup {
parseLock = [[NSLock alloc] init];
}
+ (TikzGraphAssembler*)currentAssembler {
return currentAssembler;
}
+ (TikzGraphAssembler*)assembler {
return [[[TikzGraphAssembler alloc] init] autorelease];
}
@end
// vi:ft=objc:ts=4:noet:sts=4:sw=4
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