Cleaned Code by Removing Location Tracking for Errors

MathPad/MPExpression.h

@@ -8,16 +8,34 @@
 
 @import Foundation;
 #import "NSString+MPExpressionElement.h"
-#import "MPExpressionTree.h"
 #import "MPToken.h"
 
+FOUNDATION_EXPORT NSString *const MPMathKitErrorDomain;
+FOUNDATION_EXPORT NSString *const MPExpressionPathErrorKey;
+
+NS_INLINE NSError * MPParseError(NSInteger errorCode,
+                                 NSString *errorDescription,
+                                 NSError *underlyingError) {
+    NSMutableDictionary *userInfo = [[NSMutableDictionary alloc] init];
+    if (errorDescription) {
+        userInfo[NSLocalizedDescriptionKey] = errorDescription;
+    }
+    if (underlyingError) {
+        userInfo[NSUnderlyingErrorKey] = underlyingError;
+    }
+    NSError *error = [NSError errorWithDomain:MPMathKitErrorDomain
+                                         code:errorCode
+                                     userInfo:userInfo.copy];
+    return error;
+}
+
 typedef NS_ENUM(NSUInteger, MPReferenceFrame) {
     MPElementReferenceFrame,
     MPSymbolReferenceFrame,
     MPTokenReferenceFrame
 };
 
-@class MPExpression, MPFunction, MPRangePath, MPExpressionEvaluator, MPParseError;
+@class MPExpression, MPFunction, MPRangePath, MPExpressionTree, MPExpressionEvaluator;
 @protocol MPExpressionElement;
 
 /*!
@@ -78,8 +96,6 @@ typedef NS_ENUM(NSUInteger, MPReferenceFrame) {
  */
 - (instancetype)init;
 
-- (instancetype)initWithExpressionTree:(MPExpressionTree *)expressionTree;
-
 
 /*!
     @method     initWithElement:
@@ -359,7 +375,7 @@ typedef NS_ENUM(NSUInteger, MPReferenceFrame) {
                 be evaluated. In that case the @c error parameter is set to an
                 appropriate value.
  */
-- (NSDecimalNumber *)evaluateWithError:(MPParseError *__autoreleasing *)error;
+- (NSDecimalNumber *)evaluateWithError:(NSError *__autoreleasing *)error;
 
 - (MPExpressionTree *)parse;