Added Evaluation Context and Math Rules

2014-09-15 15:58:35 +02:00
parent 6573cd1b5c
commit 3cf2006af7
6 changed files with 191 additions and 41 deletions
--- a/MathPad/MPMathRules.m
+++ b/MathPad/MPMathRules.m
@@ -0,0 +1,95 @@
+//
+//  MPMathRules.m
+//  MathPad
+//
+//  Created by Kim Wittenburg on 14.09.14.
+//  Copyright (c) 2014 Kim Wittenburg. All rights reserved.
+//
+
+#import "MPMathRules.h"
+
+NSString *MPMathRulesAllowsImplicitMultiplicationKey = @"MPMathRulesAllowsImplicitMultiplicationKey";
+NSString *MPMathRulesMaximumOperatorChainLengthKey = @"MPMathRulesMaximumOperatorChainLengthKey";
+NSString *MPMathRulesMaximumOperatorChainLengthInMultiplicationKey = @"MPMathRulesMaximumOperatorChainLengthInMultiplicationKey";
+NSString *MPMathRulesMaximumOperatorChainLengthInFunctionKey = @"MPMathRulesMaximumOperatorChainLengthInFunctionKey";
+
+@implementation MPMathRules
+
+static MPMathRules *sharedRules;
+
+ (MPMathRules *)sharedRules
+{
+    if (!sharedRules) {
+        sharedRules = [[MPMathRules alloc] init];
+    }
+    return sharedRules;
+}
+
+- (instancetype)init
+{
+    if (sharedRules) {
+        return sharedRules;
+    }
+    self = [super init];
+    if (self) {
+        _usingUserDefaultValues = YES;
+        NSNumber *userDefaultsAllowImplicitMultiplication = [[NSUserDefaults standardUserDefaults] objectForKey:MPMathRulesAllowsImplicitMultiplicationKey];
+        NSNumber *userDefaultsMaximumOperatorChainLength = [[NSUserDefaults standardUserDefaults] objectForKey:MPMathRulesMaximumOperatorChainLengthKey];
+        NSNumber *userDefaultsMaximumOperatorChainLengthInMultiplication = [[NSUserDefaults standardUserDefaults] objectForKey:MPMathRulesMaximumOperatorChainLengthInMultiplicationKey];
+        NSNumber *userDefaultsMaximumOperatorChainLengthInFunction = [[NSUserDefaults standardUserDefaults] objectForKey:MPMathRulesMaximumOperatorChainLengthInFunctionKey];
+        
+        _allowsImplicitMultiplication = userDefaultsAllowImplicitMultiplication != nil ? userDefaultsAllowImplicitMultiplication.boolValue : NO;
+        _maximumOperatorChainLength = userDefaultsMaximumOperatorChainLength != nil ? userDefaultsMaximumOperatorChainLength.unsignedIntegerValue : 2;
+        _maximumOperatorChainLengthInMultiplication = userDefaultsMaximumOperatorChainLengthInMultiplication != nil ? userDefaultsMaximumOperatorChainLengthInMultiplication.unsignedIntegerValue : 1;
+        _maximumOperatorChainLengthInFunction = userDefaultsMaximumOperatorChainLengthInFunction != nil ? userDefaultsMaximumOperatorChainLengthInFunction.unsignedIntegerValue : 1;
+    }
+    return self;
+}
+
+- (void)setUsingUserDefaultValues:(BOOL)usingUserDefaultValues
+{
+    _usingUserDefaultValues = usingUserDefaultValues;
+    // Save the current values
+    self.allowsImplicitMultiplication = self.allowsImplicitMultiplication;
+    self.maximumOperatorChainLength = self.maximumOperatorChainLength;
+    self.maximumOperatorChainLengthInMultiplication = self.maximumOperatorChainLengthInMultiplication;
+    self.maximumOperatorChainLengthInFunction = self.maximumOperatorChainLengthInFunction;
+}
+
+- (void)setAllowsImplicitMultiplication:(BOOL)allowsImplicitMultiplication
+{
+    _allowsImplicitMultiplication = allowsImplicitMultiplication;
+    if (self.isUsingUserDefaultValues) {
+        [[NSUserDefaults standardUserDefaults] setBool:allowsImplicitMultiplication
+                                                forKey:MPMathRulesAllowsImplicitMultiplicationKey];
+    }
+}
+
+- (void)setMaximumOperatorChainLength:(NSUInteger)maximumOperatorChainLength
+{
+    _maximumOperatorChainLength = maximumOperatorChainLength;
+    if (self.isUsingUserDefaultValues) {
+        [[NSUserDefaults standardUserDefaults] setObject:[NSNumber numberWithUnsignedInteger:maximumOperatorChainLength]
+                                                  forKey:MPMathRulesMaximumOperatorChainLengthKey];
+    }
+}
+
+- (void)setMaximumOperatorChainLengthInMultiplication:(NSUInteger)maximumOperatorChainLengthInMultiplication
+{
+    _maximumOperatorChainLengthInMultiplication = maximumOperatorChainLengthInMultiplication;
+    if (self.isUsingUserDefaultValues) {
+        [[NSUserDefaults standardUserDefaults] setObject:[NSNumber numberWithUnsignedInteger:maximumOperatorChainLengthInMultiplication]
+                                                  forKey:MPMathRulesMaximumOperatorChainLengthInMultiplicationKey];
+    }
+}
+
+- (void)setMaximumOperatorChainLengthInFunction:(NSUInteger)maximumOperatorChainLengthInFunction
+{
+    _maximumOperatorChainLengthInFunction = maximumOperatorChainLengthInFunction;
+    if (self.isUsingUserDefaultValues) {
+        [[NSUserDefaults standardUserDefaults] setObject:[NSNumber numberWithUnsignedInteger:maximumOperatorChainLengthInFunction]
+                                                  forKey:MPMathRulesMaximumOperatorChainLengthInFunctionKey];
+    }
+}
+
+@end