Improved Evaluation

MathPad/MPParseError.m

@@ -8,6 +8,9 @@
 
 #import "MPParseError.h"
 
+#import "MPRangePath.h"
+#import "NSIndexPath+MPAdditions.h"
+
 @implementation MPParseError
 
 - (instancetype)initWithErrorRange:(NSRange)errorRange errorMessageKey:(NSString *)key
@@ -30,6 +33,14 @@
     return self;
 }
 
+- (MPRangePath *)rangePath
+{
+    NSIndexPath *location = self.pathToExpression;
+    location = [location indexPathByPreceedingIndex:self.errorRange.location];
+    MPRangePath *rangePath = [MPRangePath rangePathWithLocation:location length:self.errorRange.length];
+    return rangePath;
+}
+
 - (NSString *)description
 {
     return [NSString stringWithFormat:@"MPParseError<at=(%ld, %ld) message=\"%@\">", self.errorRange.location, self.errorRange.length, self.localizedErrorMessage];