Implement -[NSString enumerateLinesUsingBlock:] (#407)

* Implement -[NSString enumerateLinesUsingBlock:]

* Fix formatting

* Use GNUstep CALL_BLOCK macro

Tests/base/NSString/enumerateLinesUsingBlock.m

@@ -0,0 +1,89 @@
+#import <Foundation/NSAutoreleasePool.h>
+#import <Foundation/NSString.h>
+#import <Foundation/NSArray.h>
+
+#import "Testing.h"
+
+#if defined(__has_extension) && __has_extension(blocks)
+
+BOOL testEnumerateSimpleLines() {
+  NSString *testString = @"First line\nSecond line\nThird line";
+  NSMutableArray *collectedLines = [NSMutableArray array];
+  NSArray *expectedLines = @[@"First line", @"Second line", @"Third line"];
+
+  [testString enumerateLinesUsingBlock: ^(NSString *line, BOOL *stop) {
+    [collectedLines addObject: line];
+  }];
+
+  return [collectedLines isEqualToArray: expectedLines];
+}
+
+BOOL testEnumerateCRLFLines() {
+  NSString *testString = @"First line\r\nSecond line\r\nThird line";
+  NSMutableArray *collectedLines = [NSMutableArray array];
+  NSArray *expectedLines = @[@"First line", @"Second line", @"Third line"];
+
+  [testString enumerateLinesUsingBlock: ^(NSString *line, BOOL *stop) {
+    [collectedLines addObject: line];
+  }];
+
+  return [collectedLines isEqualToArray: expectedLines];
+}
+
+BOOL testStopEarly() {
+  NSString *testString = @"First line\nSecond line\nThird line";
+  __block int lineCount = 0;
+
+  [testString enumerateLinesUsingBlock:^(NSString *line, BOOL *stop) {
+    lineCount++;
+    if ([line isEqualToString:@"Second line"]) {
+      *stop = YES;
+    }
+  }];
+
+  return lineCount == 2; // Should stop after the second line
+}
+
+BOOL testEmptyString() {
+  NSString *testString = @"";
+  __block BOOL blockCalled = NO;
+
+  [testString enumerateLinesUsingBlock:^(NSString *line, BOOL *stop) {
+    blockCalled = YES;
+  }];
+
+  return !blockCalled; // Block should not be called
+}
+
+BOOL testSingleLineNoBreaks() {
+  NSString *testString = @"Single line without line breaks";
+  __block NSString *receivedLine = nil;
+
+  [testString enumerateLinesUsingBlock:^(NSString *line, BOOL *stop) {
+    receivedLine = line;
+  }];
+
+  return [receivedLine isEqualToString:testString];
+}
+
+int main() {
+  NSAutoreleasePool *arp = [NSAutoreleasePool new];
+
+  PASS(testEnumerateSimpleLines(), "Should enumerate all lines correctly.");
+  PASS(testEnumerateCRLFLines(), "Should enumerate all CRLF lines correctly.");
+  PASS(testStopEarly(), "Should stop enumeration early as directed.");
+  PASS(testEmptyString(), "Should not call block for empty string.");
+  PASS(testSingleLineNoBreaks(), "Should handle single line without line breaks correctly.");
+
+  [arp release];
+  return 0;
+}
+
+#else
+
+int main (int argc, const char * argv[])
+{
+  return 0;
+}
+
+#endif