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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 "tikzparser.h"
#import "TikzGraphAssembler+Parser.h"
#import "tikzlexer.h"
#import "NSError+Tikzit.h"
@implementation TikzGraphAssembler
- (id)init {
self = nil;
return nil;
}
- (id)initWithGraph:(Graph*)g {
self = [super init];
if (self) {
graph = [g retain];
nodeMap = [[NSMutableDictionary alloc] init];
yylex_init (&scanner);
yyset_extra(self, scanner);
}
return self;
}
- (void)dealloc {
[graph release];
[nodeMap release];
[lastError release];
yylex_destroy (scanner);
[super dealloc];
}
- (BOOL) parseTikz:(NSString*)t error:(NSError**)error {
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
tikzStr = [t UTF8String];
yy_scan_string(tikzStr, scanner);
int result = yyparse(self);
tikzStr = NULL;
[pool drain];
if (result == 0) {
return YES;
} else {
if (error) {
if (lastError) {
*error = [[lastError retain] autorelease];
} else if (result == 1) {
*error = [NSError errorWithMessage:@"Syntax error"
code:TZ_ERR_PARSE];
} else if (result == 2) {
*error = [NSError errorWithMessage:@"Insufficient memory"
code:TZ_ERR_PARSE];
} else {
*error = [NSError errorWithMessage:@"Unknown error"
code:TZ_ERR_PARSE];
}
}
return NO;
}
}
+ (BOOL) parseTikz:(NSString*)tikz forGraph:(Graph*)gr {
return [self parseTikz:tikz forGraph:gr error:NULL];
}
+ (Graph*) parseTikz:(NSString*)tikz error:(NSError**)e {
Graph *gr = [[Graph alloc] init];
if ([self parseTikz:tikz forGraph:gr error:e]) {
return [gr autorelease];
} else {
[gr release];
return nil;
}
}
+ (Graph*) parseTikz:(NSString*)tikz {
return [self parseTikz:tikz error:NULL];
}
+ (BOOL) parseTikz:(NSString*)tikz forGraph:(Graph*)gr error:(NSError**)error {
if([tikz length] == 0) {
// empty string -> empty graph
return YES;
}
TikzGraphAssembler *assembler = [[self alloc] initWithGraph:gr];
BOOL success = [assembler parseTikz:tikz error:error];
[assembler release];
return success;
}
+ (BOOL)validateTikzPropertyNameOrValue:(NSString*)tikz {
BOOL r;
NSString * testTikz = [NSString stringWithFormat: @"{%@}", tikz];
void *scanner;
yylex_init (&scanner);
yyset_extra(nil, scanner);
yy_scan_string([testTikz UTF8String], scanner);
YYSTYPE lval;
YYLTYPE lloc;
yylex(&lval, &lloc, scanner);
r = !(yyget_leng(scanner) < [testTikz length]);
yylex_destroy(scanner);
[testTikz autorelease];
return r;
}
@end
@implementation TikzGraphAssembler (Parser)
- (Graph*)graph { return graph; }
- (void)addNodeToMap:(Node*)n {
[nodeMap setObject:n forKey:[n name]];
}
- (Node*)nodeWithName:(NSString*)name {
return [nodeMap objectForKey:name];
}
- (void) setLastError:(NSError*)error {
[error retain];
[lastError release];
lastError = error;
}
- (void) reportError:(const char *)message atLocation:(YYLTYPE*)yylloc {
NSString *nsmsg = [NSString stringWithUTF8String:message];
const char *first_line_start = find_start_of_nth_line (
tikzStr, yylloc->first_line - 1);
const char *last_line_start = find_start_of_nth_line (
first_line_start, yylloc->last_line - yylloc->first_line);
const char *last_line_end = last_line_start;
while (*last_line_end && *last_line_end != '\n') {
// points to just after end of last line
++last_line_end;
}
const char *error_start = first_line_start + (yylloc->first_column - 1);
const char *error_end = last_line_start + (yylloc->last_column - 1);
if (error_start > error_end || error_end > last_line_end) {
// error position state is corrupted
NSLog(@"Got bad error state for error \"%s\": start(%i,%i), end(%i,%i)",
message,
yylloc->first_line,
yylloc->first_column,
yylloc->last_line,
yylloc->last_column);
[self setLastError:[NSError errorWithMessage:nsmsg
code:TZ_ERR_PARSE]];
} else {
// +1 for null terminator
size_t error_text_len = last_line_end - first_line_start;
char *error_text = malloc (error_text_len + 1);
strncpy (error_text, first_line_start, error_text_len);
*(error_text + error_text_len) = '\0';
int error_start_pos = error_start - first_line_start;
int error_end_pos = error_end - first_line_start;
NSDictionary *userInfo =
[NSDictionary dictionaryWithObjectsAndKeys:
nsmsg,
NSLocalizedDescriptionKey,
[NSNumber numberWithInt:yylloc->first_line],
@"startLine",
[NSNumber numberWithInt:yylloc->first_column],
@"startColumn",
[NSNumber numberWithInt:yylloc->last_line],
@"endLine",
[NSNumber numberWithInt:yylloc->last_column],
@"endColumn",
[NSString stringWithUTF8String:error_text],
@"syntaxString",
[NSNumber numberWithInt:error_start_pos],
@"tokenStart",
[NSNumber numberWithInt:error_end_pos],
@"tokenLength",
nil];
[self setLastError:
[NSError errorWithDomain:TZErrorDomain
code:TZ_ERR_PARSE
userInfo:userInfo]];
// we can now freely edit error_text
// we only bother printing out the first line
if (yylloc->last_line > yylloc->first_line) {
char *nlp = strchr(error_text, '\n');
if (nlp) {
*nlp = '\0';
error_text_len = nlp - error_text;
if (error_end_pos > error_text_len)
error_end_pos = error_text_len;
}
}
NSString *pointerLinePadding =
[@"" stringByPaddingToLength:error_start_pos
withString:@" "
startingAtIndex:0];
NSString *pointerLineCarets =
[@"" stringByPaddingToLength:(error_end_pos - error_start_pos)
withString:@"^"
startingAtIndex:0];
NSLog(@"Parse error on line %i, starting at %i: %s\n%s\n%@%@",
yylloc->first_line,
yylloc->first_column,
message,
error_text,
pointerLinePadding,
pointerLineCarets);
free (error_text);
}
}
- (void*) scanner { return scanner; }
@end
// vi:ft=objc:ts=4:noet:sts=4:sw=4
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