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SOCKit.m
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//
// Copyright 2011 Jeff Verkoeyen
//
// 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 "SOCKit.h"
#import <objc/runtime.h>
#import <assert.h>
typedef enum {
SOCArgumentTypeNone,
SOCArgumentTypePointer,
SOCArgumentTypeBool,
SOCArgumentTypeInteger,
SOCArgumentTypeLongLong,
SOCArgumentTypeFloat,
SOCArgumentTypeDouble,
} SOCArgumentType;
SOCArgumentType SOCArgumentTypeForTypeAsChar(char argType);
NSString* kTemporaryBackslashToken = @"/backslash/";
///////////////////////////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////////////////////////
@interface SOCParameter : NSObject {
@private
NSString* _string;
}
- (id)initWithString:(NSString *)string;
+ (id)parameterWithString:(NSString *)string;
- (NSString *)string;
@end
///////////////////////////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////////////////////////
@interface SOCPattern()
- (void)_compilePattern;
@end
///////////////////////////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////////////////////////
@implementation SOCPattern
///////////////////////////////////////////////////////////////////////////////////////////////////
- (void)dealloc {
[_patternString release]; _patternString = nil;
[_tokens release]; _tokens = nil;
[_parameters release]; _parameters = nil;
[super dealloc];
}
///////////////////////////////////////////////////////////////////////////////////////////////////
- (id)initWithString:(NSString *)string {
if ((self = [super init])) {
_patternString = [string copy];
[self _compilePattern];
}
return self;
}
///////////////////////////////////////////////////////////////////////////////////////////////////
+ (id)patternWithString:(NSString *)string {
return [[[self alloc] initWithString:string] autorelease];
}
///////////////////////////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////////////////////////
#pragma mark - Pattern Compilation
///////////////////////////////////////////////////////////////////////////////////////////////////
- (NSCharacterSet *)nonParameterCharacterSet {
NSMutableCharacterSet* parameterCharacterSet = [NSMutableCharacterSet alphanumericCharacterSet];
[parameterCharacterSet addCharactersInString:@".@_"];
NSCharacterSet* nonParameterCharacterSet = [parameterCharacterSet invertedSet];
return nonParameterCharacterSet;
}
///////////////////////////////////////////////////////////////////////////////////////////////////
- (void)_compilePattern {
if ([_patternString length] == 0) {
return;
}
NSMutableArray* tokens = [[NSMutableArray alloc] init];
NSMutableArray* parameters = [[NSMutableArray alloc] init];
NSCharacterSet* nonParameterCharacterSet = [self nonParameterCharacterSet];
// Turn escaped backslashes into a special backslash token to avoid \\. being interpreted as
// `\` and `\.` rather than `\\` and `.`.
NSString* escapedPatternString = _patternString;
if ([escapedPatternString rangeOfString:@"\\\\"].length > 0) {
escapedPatternString = [escapedPatternString stringByReplacingOccurrencesOfString: @"\\\\"
withString: kTemporaryBackslashToken];
}
// Scan through the string, creating tokens that are either strings or parameters.
// Parameters are prefixed with ":".
NSScanner* scanner = [NSScanner scannerWithString:escapedPatternString];
// NSScanner skips whitespace and newlines by default (not ideal!).
[scanner setCharactersToBeSkipped:nil];
while (![scanner isAtEnd]) {
NSString* token = nil;
[scanner scanUpToString:@":" intoString:&token];
if ([token length] > 0) {
if (![token hasSuffix:@"\\"]) {
// Add this static text to the token list.
[tokens addObject:token];
} else {
// This token is escaping the next colon, so we skip the parameter creation.
[tokens addObject:[token stringByAppendingString:@":"]];
// Skip the colon.
[scanner setScanLocation:[scanner scanLocation] + 1];
continue;
}
}
if (![scanner isAtEnd]) {
// Skip the colon.
[scanner setScanLocation:[scanner scanLocation] + 1];
// Scanning won't modify the token if there aren't any characters to be read, so we must
// clear it before scanning again.
token = nil;
[scanner scanUpToCharactersFromSet:nonParameterCharacterSet intoString:&token];
if ([token length] > 0) {
// Only add parameters that have valid names.
SOCParameter* parameter = [SOCParameter parameterWithString:token];
[parameters addObject:parameter];
[tokens addObject:parameter];
} else {
// Allows for http:// to get by without creating a parameter.
[tokens addObject:@":"];
}
}
}
// This is an outbound pattern.
if ([parameters count] > 0) {
BOOL lastWasParameter = NO;
for (id token in tokens) {
if ([token isKindOfClass:[SOCParameter class]]) {
NSAssert(!lastWasParameter, @"Parameters must be separated by non-parameter characters.");
lastWasParameter = YES;
} else {
lastWasParameter = NO;
}
}
}
[_tokens release];
_tokens = [tokens copy];
[_parameters release]; _parameters = nil;
if ([parameters count] > 0) {
_parameters = [parameters copy];
}
[tokens release]; tokens = nil;
[parameters release]; parameters = nil;
}
///////////////////////////////////////////////////////////////////////////////////////////////////
- (NSString *)_stringFromEscapedToken:(NSString *)token {
if ([token rangeOfString:@"\\"].length == 0
&& [token rangeOfString:kTemporaryBackslashToken].length == 0) {
// The common case (faster and creates fewer autoreleased strings).
return token;
} else {
// Escaped characters may exist.
// Create a mutable copy so that we don't excessively create new autoreleased strings.
NSMutableString* mutableToken = [token mutableCopy];
[mutableToken replaceOccurrencesOfString:@"\\." withString:@"." options:0 range:NSMakeRange(0, [mutableToken length])];
[mutableToken replaceOccurrencesOfString:@"\\@" withString:@"@" options:0 range:NSMakeRange(0, [mutableToken length])];
[mutableToken replaceOccurrencesOfString:@"\\:" withString:@":" options:0 range:NSMakeRange(0, [mutableToken length])];
[mutableToken replaceOccurrencesOfString:kTemporaryBackslashToken withString:@"\\" options:0 range:NSMakeRange(0, [mutableToken length])];
return [mutableToken autorelease];
}
}
///////////////////////////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////////////////////////
#pragma mark - Public Methods
///////////////////////////////////////////////////////////////////////////////////////////////////
- (BOOL)gatherParameterValues:(NSArray**)pValues fromString:(NSString *)string {
const NSInteger stringLength = [string length];
NSInteger validUpUntil = 0;
NSInteger matchingTokens = 0;
NSMutableArray* values = nil;
if (nil != pValues) {
values = [NSMutableArray array];
}
NSInteger tokenIndex = 0;
for (id token in _tokens) {
if ([token isKindOfClass:[NSString class]]) {
// Replace the escaped characters in the token before we start comparing the string.
token = [self _stringFromEscapedToken:token];
NSInteger tokenLength = [token length];
if (validUpUntil + tokenLength > stringLength) {
// There aren't enough characters in the string to satisfy this token.
break;
}
if (![[string substringWithRange:NSMakeRange(validUpUntil, tokenLength)]
isEqualToString:token]) {
// The tokens don't match up.
break;
}
// The string token matches.
validUpUntil += tokenLength;
++matchingTokens;
} else {
NSInteger parameterLocation = validUpUntil;
// Look ahead for the next string token match.
if (tokenIndex + 1 < [_tokens count]) {
NSString* nextToken = [self _stringFromEscapedToken:[_tokens objectAtIndex:tokenIndex + 1]];
NSAssert([nextToken isKindOfClass:[NSString class]], @"The token following a parameter must be a string.");
NSRange nextTokenRange = [string rangeOfString:nextToken options:0 range:NSMakeRange(validUpUntil, stringLength - validUpUntil)];
if (nextTokenRange.length == 0) {
// Couldn't find the next token.
break;
}
if (nextTokenRange.location == validUpUntil) {
// This parameter is empty.
break;
}
validUpUntil = nextTokenRange.location;
++matchingTokens;
} else {
// Anything goes until the end of the string then.
if (validUpUntil == stringLength) {
// The last parameter is empty.
break;
}
validUpUntil = stringLength;
++matchingTokens;
}
NSRange parameterRange = NSMakeRange(parameterLocation, validUpUntil - parameterLocation);
[values addObject:[string substringWithRange:parameterRange]];
}
++tokenIndex;
}
if (nil != pValues) {
*pValues = [[values copy] autorelease];
}
return validUpUntil == stringLength && matchingTokens == [_tokens count];
}
///////////////////////////////////////////////////////////////////////////////////////////////////
- (BOOL)stringMatches:(NSString *)string {
return [self gatherParameterValues:nil fromString:string];
}
///////////////////////////////////////////////////////////////////////////////////////////////////
- (void)setArgument:(NSString*)text withType:(SOCArgumentType)type atIndex:(NSInteger)index forInvocation:(NSInvocation*)invocation {
// There are two implicit arguments with an invocation.
index+=2;
switch (type) {
case SOCArgumentTypeNone: {
break;
}
case SOCArgumentTypeInteger: {
int val = [text intValue];
[invocation setArgument:&val atIndex:index];
break;
}
case SOCArgumentTypeLongLong: {
long long val = [text longLongValue];
[invocation setArgument:&val atIndex:index];
break;
}
case SOCArgumentTypeFloat: {
float val = [text floatValue];
[invocation setArgument:&val atIndex:index];
break;
}
case SOCArgumentTypeDouble: {
double val = [text doubleValue];
[invocation setArgument:&val atIndex:index];
break;
}
case SOCArgumentTypeBool: {
BOOL val = [text boolValue];
[invocation setArgument:&val atIndex:index];
break;
}
default: {
[invocation setArgument:&text atIndex:index];
break;
}
}
}
///////////////////////////////////////////////////////////////////////////////////////////////////
- (void)setArgumentsFromValues:(NSArray *)values forInvocation:(NSInvocation *)invocation {
Method method = class_getInstanceMethod([invocation.target class], invocation.selector);
NSAssert(nil != method, @"The method must exist with the given invocation target.");
for (NSInteger ix = 0; ix < [values count]; ++ix) {
NSString* value = [values objectAtIndex:ix];
char argType[4];
method_getArgumentType(method, (unsigned int) ix + 2, argType, sizeof(argType) / sizeof(argType[0]));
SOCArgumentType type = SOCArgumentTypeForTypeAsChar(argType[0]);
[self setArgument:value withType:type atIndex:ix forInvocation:invocation];
}
}
///////////////////////////////////////////////////////////////////////////////////////////////////
- (id)performSelector:(SEL)selector onObject:(id)object sourceString:(NSString *)sourceString {
BOOL isInitializer = [NSStringFromSelector(selector) hasPrefix:@"init"] && [object class] == object;
if (isInitializer) {
object = [[object alloc] autorelease];
}
NSArray* values = nil;
NSAssert([self gatherParameterValues:&values fromString:sourceString], @"The pattern can't be used with this string.");
id returnValue = nil;
NSMethodSignature* sig = [object methodSignatureForSelector:selector];
NSAssert(nil != sig, @"%@ does not respond to selector: '%@'", object, NSStringFromSelector(selector));
NSInvocation* invocation = [NSInvocation invocationWithMethodSignature:sig];
[invocation setTarget:object];
[invocation setSelector:selector];
[self setArgumentsFromValues:values forInvocation:invocation];
[invocation invoke];
if (sig.methodReturnLength) {
[invocation getReturnValue:&returnValue];
}
return returnValue;
}
///////////////////////////////////////////////////////////////////////////////////////////////////
- (NSDictionary *)parameterDictionaryFromSourceString:(NSString *)sourceString {
NSMutableDictionary* kvs = [[NSMutableDictionary alloc] initWithCapacity:[_parameters count]];
NSArray* values = nil;
NSAssert([self gatherParameterValues:&values fromString:sourceString], @"The pattern can't be used with this string.");
for (NSInteger ix = 0; ix < [values count]; ++ix) {
SOCParameter* parameter = [_parameters objectAtIndex:ix];
id value = [values objectAtIndex:ix];
[kvs setObject:value forKey:parameter.string];
}
NSDictionary* result = [[kvs copy] autorelease];
[kvs release]; kvs = nil;
return result;
}
///////////////////////////////////////////////////////////////////////////////////////////////////
- (NSString *)_stringWithParameterValues:(NSDictionary *)parameterValues {
NSMutableString* accumulator = [[NSMutableString alloc] initWithCapacity:[_patternString length]];
for (id token in _tokens) {
if ([token isKindOfClass:[NSString class]]) {
[accumulator appendString:[self _stringFromEscapedToken:token]];
} else {
SOCParameter* parameter = token;
[accumulator appendString:[parameterValues objectForKey:parameter.string]];
}
}
NSString* result = nil;
result = [[accumulator copy] autorelease];
[accumulator release]; accumulator = nil;
return result;
}
///////////////////////////////////////////////////////////////////////////////////////////////////
- (NSString *)stringFromObject:(id)object {
if ([_tokens count] == 0) {
return @"";
}
NSMutableDictionary* parameterValues =
[NSMutableDictionary dictionaryWithCapacity:[_parameters count]];
for (SOCParameter* parameter in _parameters) {
NSString* stringValue = [NSString stringWithFormat:@"%@", [object valueForKeyPath:parameter.string]];
[parameterValues setObject:stringValue forKey:parameter.string];
}
return [self _stringWithParameterValues:parameterValues];
}
///////////////////////////////////////////////////////////////////////////////////////////////////
#if NS_BLOCKS_AVAILABLE
- (NSString *)stringFromObject:(id)object withBlock:(NSString *(^)(NSString*))block {
if ([_tokens count] == 0) {
return @"";
}
NSMutableDictionary* parameterValues = [NSMutableDictionary dictionaryWithCapacity:[_parameters count]];
for (SOCParameter* parameter in _parameters) {
NSString* stringValue = [NSString stringWithFormat:@"%@", [object valueForKeyPath:parameter.string]];
if (nil != block) {
stringValue = block(stringValue);
}
if (nil != stringValue) {
[parameterValues setObject:stringValue forKey:parameter.string];
}
}
return [self _stringWithParameterValues:parameterValues];
}
#endif
@end
///////////////////////////////////////////////////////////////////////////////////////////////////
@implementation SOCParameter
- (void)dealloc {
[_string release]; _string = nil;
[super dealloc];
}
- (id)initWithString:(NSString *)string {
if ((self = [super init])) {
_string = [string copy];
}
return self;
}
+ (id)parameterWithString:(NSString *)string {
return [[[self alloc] initWithString:string] autorelease];
}
- (NSString *)description {
return [NSString stringWithFormat:@"Parameter: %@", _string];
}
- (NSString *)string {
return [[_string retain] autorelease];
}
@end
///////////////////////////////////////////////////////////////////////////////////////////////////
SOCArgumentType SOCArgumentTypeForTypeAsChar(char argType) {
if (argType == 'c' || argType == 'i' || argType == 's' || argType == 'l' || argType == 'C'
|| argType == 'I' || argType == 'S' || argType == 'L') {
return SOCArgumentTypeInteger;
} else if (argType == 'q' || argType == 'Q') {
return SOCArgumentTypeLongLong;
} else if (argType == 'f') {
return SOCArgumentTypeFloat;
} else if (argType == 'd') {
return SOCArgumentTypeDouble;
} else if (argType == 'B') {
return SOCArgumentTypeBool;
} else {
return SOCArgumentTypePointer;
}
}
///////////////////////////////////////////////////////////////////////////////////////////////////
NSString* SOCStringFromStringWithObject(NSString* string, id object) {
SOCPattern* pattern = [[SOCPattern alloc] initWithString:string];
NSString* result = [pattern stringFromObject:object];
[pattern release];
return result;
}