Getting rid of -CPStack position, using isEmpty instead

CPStack.h

@@ -27,7 +27,6 @@
 - (CPToken *) tokenAtIndex:(NSInteger)index;
 
 - (NSInteger) count;
-- (NSInteger) position;
 
 - (NSArray *) popUpToToken: (CPToken *) search;
 - (NSArray *) popUpToOperator: (CPOperator) op;

CPStack.m

@@ -70,18 +70,13 @@ - (CPToken *) tokenAtIndex:(NSInteger)index
 }
 
 #pragma mark -
-#pragma mark count / position
+#pragma mark count
 
 - (NSInteger) count
 {
 	return [stack count];
 }
 
-- (NSInteger) position
-{
-	return [stack count];
-}
-
 #pragma mark -
 #pragma mark description
 

CPTokenizer.m

@@ -70,7 +70,7 @@ - (NSArray *) processCommaOperatorStack: (CPStack *) stack;
 {
 	NSArray *ops = [stack popUpToOperator: CPOperatorLBrace];
 
-	if (nil == ops || [stack position] == 0 || [[stack lastToken] type] != CPTokenFunction) {
+	if (nil == ops || [stack isEmpty] || [[stack lastToken] type] != CPTokenFunction) {
 		NSException *exception = [NSException exceptionWithName:CPSyntaxErrorException
 														 reason:@"function missing" 
 													   userInfo:nil];
@@ -88,7 +88,7 @@ - (NSArray *) processRBraceOperatorStack: (CPStack *) stack;
 		[NSException raise: CPSyntaxErrorException format: @"Missing '('"];
 	}
 
-	if ([stack position] != 0 && [[stack lastToken] type] == CPTokenFunction) {
+	if (![stack isEmpty] && [[stack lastToken] type] == CPTokenFunction) {
 		ops = [ops arrayByAddingObject: [stack pop]];
 	}
 
@@ -100,7 +100,7 @@ - (NSArray *) processDefaultOperator: (CPToken *) token stack: (CPStack *) stack
 	NSMutableArray *output = [NSMutableArray array];
 
 	CPOperator operator = [token operatorValue];
-	while ([stack position] > 0) {
+	while (![stack isEmpty]) {
 		const bool leftAssoc = [Operators associativity: operator] == CPOperatorAssocLeft;
 		const unsigned priority = [Operators priority: operator];
 		const unsigned lastStackPriority = [Operators priority: [[stack lastToken] operatorValue]];

Tests/TestStack.m

@@ -23,7 +23,6 @@ - (void) testEmpty;
 
 	STAssertTrue( [stack isEmpty], @"Should be empty" );
 	STAssertTrue( [stack count] == 0, @"Should be empty" );
-	STAssertTrue( [stack position] == 0, @"Should be empty" );
 
 	STAssertNil( [stack pop], @"Should be empty" );
 	STAssertNil( [stack lastToken], @"Should be empty" );