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//
// GTMXcodeCorrectWhiteSpace.m
//
// Copyright 2009 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy
// of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
//
#import <Cocoa/Cocoa.h>
#import "GTMObjC2Runtime.h"
#import "GTMXcodePlugin.h"
#import "GTMXcodePreferences.h"
@interface GTMXcodeCorrectWhiteSpace : NSObject
- (BOOL)gdt_writeToFile:(NSString *)fileName ofType:(NSString *)type;
@end
@implementation GTMXcodeCorrectWhiteSpace
// Register our class to perform the swizzle once the plugin has finished
// loading.
+ (void)load {
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
[GTMXcodePlugin registerSwizzleClass:self];
[pool release];
}
// Default initializer. Swizzles [PBXTextFileDocument writeToFile:ofType:]
// with our [gdt_writeToFile:ofType:].
- (id)init {
if ((self = [super init])) {
SEL ourSelector = @selector(gdt_writeToFile:ofType:);
Method ourMethod = class_getInstanceMethod([self class], ourSelector);
Class pbxClass = NSClassFromString(@"PBXTextFileDocument");
if (class_addMethod(pbxClass,
ourSelector,
method_getImplementation(ourMethod),
method_getTypeEncoding(ourMethod))) {
ourMethod = class_getInstanceMethod(pbxClass, ourSelector);
Method theirMethod
= class_getInstanceMethod(pbxClass, @selector(writeToFile:ofType:));
method_exchangeImplementations(ourMethod, theirMethod);
}
}
return self;
}
// Perform a "subtraction of ranges". A - B. Not transitive.
static NSRange SubtractRange(NSRange a, NSRange b) {
NSRange newRange;
NSUInteger maxRangeA = NSMaxRange(a);
NSUInteger maxRangeB = NSMaxRange(b);
if (b.location == NSNotFound) {
// B is bogus
newRange = a;
} else if (maxRangeB <= a.location) {
// B is completely before A
newRange = NSMakeRange(a.location - b.length, a.length);
} else if (maxRangeA <= b.location) {
// B is completely after A
newRange = a;
} else if (b.location <= a.location && maxRangeB >= maxRangeA) {
// B subsumes A
newRange = NSMakeRange(b.location, 0);
} else if (a.location <= b.location && maxRangeA >= maxRangeB) {
// A subsumes B
newRange = NSMakeRange(a.location, a.length - b.length);
} else if (b.location <= a.location && maxRangeB <= maxRangeA) {
// B overlaps front edge of A
NSUInteger diff = maxRangeB - a.location;
newRange = NSMakeRange(a.location + diff, a.length - diff);
} else if (b.location <= maxRangeA && maxRangeB >= maxRangeA) {
// B overlaps back edge of A
NSUInteger diff = maxRangeA - b.location;
newRange = NSMakeRange(a.location, a.length - diff);
}
return newRange;
}
+ (BOOL)gdt_writeToFile:(NSString *)fileName
ofType:(NSString *)type
object:(id)object {
NSTextStorage *storage = [(id)object textStorage];
id delegate = [storage delegate];
// Need to keep track of all the current selections so that we can replace
// them after stripping off the whitespace. A single source file can have
// multiple views, so we store one selection per view.
NSArray *windowControllers = [delegate windowControllers];
size_t size = sizeof(NSRange) * [windowControllers count];
NSRange *ranges = [[NSMutableData dataWithLength:size] mutableBytes];
NSUInteger rangeCount = 0;
for (id controller in windowControllers) {
if ([controller respondsToSelector:@selector(textView)]) {
NSTextView *textView = [controller textView];
ranges[rangeCount] = [textView selectedRange];
rangeCount++;
}
}
NSMutableString *text = [[[storage string] mutableCopy] autorelease];
NSRange oldRange = NSMakeRange(0, [text length]);
// Figure out the newlines in our file.
NSString *newlineString = @"\n";
if ([text rangeOfString:@"\r\n"].length > 0) {
newlineString = @"\r\n";
} else if ([text rangeOfString:@"\r"].length > 0) {
newlineString = @"\r";
}
NSUInteger newlineStringLength = [newlineString length];
NSCharacterSet *whiteSpace
= [NSCharacterSet characterSetWithCharactersInString:@" \t"];
NSMutableCharacterSet *nonWhiteSpace = [[whiteSpace mutableCopy] autorelease];
[nonWhiteSpace invert];
// If the file is missing a newline at the end, add it now.
if (![text hasSuffix:newlineString]) {
[text appendString:newlineString];
}
NSRange textRange = NSMakeRange(0, [text length] - 1);
while (textRange.length > 0) {
NSRange lineRange = [text rangeOfString:newlineString
options:NSBackwardsSearch
range:textRange];
if (lineRange.location == NSNotFound) {
lineRange.location = 0;
} else {
lineRange.location += newlineStringLength;
}
lineRange.length = textRange.length - lineRange.location;
textRange.length = lineRange.location;
if (textRange.length != 0) {
textRange.length -= newlineStringLength;
}
NSRange whiteRange = [text rangeOfCharacterFromSet:whiteSpace
options:NSBackwardsSearch
range:lineRange];
if (NSMaxRange(whiteRange) == NSMaxRange(lineRange)) {
NSRange nonWhiteRange = [text rangeOfCharacterFromSet:nonWhiteSpace
options:NSBackwardsSearch
range:lineRange];
NSRange deleteRange;
if (nonWhiteRange.location == NSNotFound) {
deleteRange.location = lineRange.location;
} else {
deleteRange.location = NSMaxRange(nonWhiteRange);
}
deleteRange.length = NSMaxRange(whiteRange) - deleteRange.location;
[text deleteCharactersInRange:deleteRange];
// Update all the selections appropriately.
for (NSUInteger i = 0; i < rangeCount; ++i) {
NSRange baseRange = ranges[i];
NSRange newRange = SubtractRange(baseRange, deleteRange);
ranges[i] = newRange;
}
}
}
// Replace the text with the new stripped version.
[storage beginEditing];
[storage replaceCharactersInRange:oldRange withString:text];
[storage endEditing];
// Fix up selections
NSUInteger count = 0;
for (id controller in windowControllers) {
if ([controller respondsToSelector:@selector(textView)]) {
NSRange newRange = ranges[count];
if (newRange.location != NSNotFound) {
NSTextView *textView = [controller textView];
[textView setSelectedRange:ranges[count]];
}
count++;
}
}
// Finish the save.
return [object gdt_writeToFile:fileName ofType:type];
}
- (BOOL)gdt_writeToFile:(NSString *)fileName ofType:(NSString *)type {
BOOL isGood;
// Check our defaults to see if we want to strip whitespace.
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
if ([defaults boolForKey:GTMXcodeCorrectWhiteSpaceOnSave]) {
isGood = [GTMXcodeCorrectWhiteSpace gdt_writeToFile:fileName
ofType:type
object:self];
} else {
isGood = [self gdt_writeToFile:fileName ofType:type];
}
return isGood;
}
@end
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