vision.json.patch.operation.basic source code

1 module vision.json.patch.operation.basic;
2 
3 public import vision.json.patch.commons;
4 public import vision.json.pointer;
5 
6  /**
7   * Basic class for all diff operations
8   */
9 class DiffOperation
10 {
11 	import std.typecons: Tuple;
12 	import std.range: InputRange;
13 	
14 	alias DataRange = InputRange!(Tuple!(string, const JsonItem));
15 	
16 	/// Error message for last failed operation 
17 	static string lastError;
18 	/// Path of element to affect
19 	const JsonPointer path;
20 	/// Operation name
21 	abstract @property string op() pure const @safe;
22 	
23 	/// Apply this operation to document
24 	bool applyTo(ref JsonItem document) const
25 	{
26 		return applyToPtr(&document);
27 	}
28 	
29 	/// Apply this operation to document by pointer
30 	abstract bool applyToPtr(JsonItem* document) const;
31 	
32 	this(const string path) @safe
33 	{
34 		this.path = JsonPointer(path);
35 	}
36 	
37 	this(const JsonPointer path) @safe
38 	{
39 		this.path = path;
40 	}
41 	
42 	/// Convert to Json element
43 	JsonItem toJson() const
44 	{
45 		return JsonItem(["op": JsonItem(op), "path": JsonItem(path.toString)]);
46 	}
47 	
48 	string toJsonString() const
49 	{
50 		import std.json : toJSON, JSONOptions;
51 		
52 		auto json = toJson;
53 		return json.toJSON(false, JSONOptions.doNotEscapeSlashes);
54 	}
55 	
56 	/// Return error and store error message
57 	static bool error(string errorMessage)
58 	{
59 		lastError = errorMessage;
60 		return false;
61 	}
62 }