1 files changed, 101 insertions, 0 deletions
diff --git a/Firestore/Source/API/FIRFieldPath.mm b/Firestore/Source/API/FIRFieldPath.mm
new file mode 100644
index 0000000..f4e532f
--- /dev/null
+++ b/Firestore/Source/API/FIRFieldPath.mm
@@ -0,0 +1,101 @@
+/*
+ * Copyright 2017 Google
+ *
+ * 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 "Firestore/Source/API/FIRFieldPath+Internal.h"
+
+#import "Firestore/Source/Model/FSTPath.h"
+#import "Firestore/Source/Util/FSTUsageValidation.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@implementation FIRFieldPath
+
+- (instancetype)initWithFields:(NSArray<NSString *> *)fieldNames {
+  if (fieldNames.count == 0) {
+    FSTThrowInvalidArgument(@"Invalid field path. Provided names must not be empty.");
+  }
+
+  for (int i = 0; i < fieldNames.count; ++i) {
+    if (fieldNames[i].length == 0) {
+      FSTThrowInvalidArgument(@"Invalid field name at index %d. Field names must not be empty.", i);
+    }
+  }
+
+  return [self initPrivate:[FSTFieldPath pathWithSegments:fieldNames]];
+}
+
++ (instancetype)documentID {
+  return [[FIRFieldPath alloc] initPrivate:FSTFieldPath.keyFieldPath];
+}
+
+- (instancetype)initPrivate:(FSTFieldPath *)fieldPath {
+  if (self = [super init]) {
+    _internalValue = fieldPath;
+  }
+  return self;
+}
+
++ (instancetype)pathWithDotSeparatedString:(NSString *)path {
+  if ([[FIRFieldPath reservedCharactersRegex]
+          numberOfMatchesInString:path
+                          options:0
+                            range:NSMakeRange(0, path.length)] > 0) {
+    FSTThrowInvalidArgument(
+        @"Invalid field path (%@). Paths must not contain '~', '*', '/', '[', or ']'", path);
+  }
+  @try {
+    return [[FIRFieldPath alloc] initWithFields:[path componentsSeparatedByString:@"."]];
+  } @catch (NSException *exception) {
+    FSTThrowInvalidArgument(
+        @"Invalid field path (%@). Paths must not be empty, begin with '.', end with '.', or "
+        @"contain '..'",
+        path);
+  }
+}
+
+/** Matches any characters in a field path string that are reserved. */
++ (NSRegularExpression *)reservedCharactersRegex {
+  static NSRegularExpression *regex = nil;
+  static dispatch_once_t onceToken;
+  dispatch_once(&onceToken, ^{
+    regex = [NSRegularExpression regularExpressionWithPattern:@"[~*/\\[\\]]" options:0 error:nil];
+  });
+  return regex;
+}
+
+- (id)copyWithZone:(NSZone *__nullable)zone {
+  return [[[self class] alloc] initPrivate:self.internalValue];
+}
+
+- (BOOL)isEqual:(nullable id)object {
+  if (self == object) {
+    return YES;
+  }
+
+  if (![object isKindOfClass:[FIRFieldPath class]]) {
+    return NO;
+  }
+
+  return [self.internalValue isEqual:((FIRFieldPath *)object).internalValue];
+}
+
+- (NSUInteger)hash {
+  return [self.internalValue hash];
+}
+
+@end
+
+NS_ASSUME_NONNULL_END