Json Class

List of functions:

This class is used to parse and create JSON formatted strings.

Each Json node has type, name and value. Also, it can have child Json nodes and a parent node.

Json node can have one of the following types:

null
bool
number
string
array
object

The Json node has a hierarchy structure. The following code creates a Json node and adds child nodes with different type of values:

Source code(UnigineScript)

Json json = new Json();
json.addChild("child_0",0);    // int
json.addChild("child_1",1.1);   // float
json.addChild("child_2","two");   // string

The result is:

Output

{
  "child_0": 0,
  "child_1": 1.1,
  "child_2": "two" 
}

Child nodes have names "child_0", "child_1", "child_2" and values: integer 0, double 1.1 and string "two". The name has always string type.

Json Class

Members

Json ()

Default constructor that creates an empty instance.

Json (string name)

Constructor that creates a JSON node with a given name.

Arguments

string name - Name of the Json node.

int getNumChildren ()

Returns the number of child nodes of the current Json node.

Return value

Number of child nodes.

void setName (string name)

Sets the given name to the Json node.

Arguments

string name - Name of the Json node.

int isNull ()

Returns a value indicating if the Json node has a null type.

Return value

1 if the Json has a null type; otherwise, 0.

Json addChild (string name, variable value, variable var)

Adds a new name-value pair as a child node to the current Json node.

Arguments

string name - Node name.
variable value - Argument of one of the following types:
- intvalue - integer value.
- floatvalue - float value.
- stringvalue - string value.
variable var - Argument of one of the following types:
- Jsonjson - Json node.
- stringname - Name of the Json node.

Return value

Child Json node.

void clearChildren ()

Clears all children of the current Json node.

StringStack<256> getString ()

Returns the value of the current Json node as string.

Return value

Value of the current Json node

int isArray ()

Returns a value indicating if the Json node has an array type.

Return value

1 if the Json has an array type; otherwise, 0.

int isNumber ()

Returns a value indicating if the Json node has a number type.

Return value

1 if the Json has a number type; otherwise, 0.

String getFormattedSubTree (string name = 0)

Returns a subtree of a Json node as the formatted string.

Usage Example

To get the formatted subtree of a Json node, do the following:

Source code(UnigineScript)

Json json = new Json();

json.addChild("child_0", 1);
json.addChild("child_1", 2.2);
json.addChild("child_2", "three");
Json object = json.addChild("object");
object.setObject(("1": 5, "4": 6, "2": 7));

string fSubTree = json.getFormattedSubTree();
log.message("the formatted subtree is:%s\n", fSubTree);

In the console you see the following:

Output

the formatted subtree is:{
  "child_0": 1,
  "child_1": 2.2,
  "child_2": "three",
  "object": {
    "1": 5,
    "2": 7,
    "4": 6
  }
}

Arguments

string name - The name of a child node. If there is a name, the function returns formatted subtree for this child Json node.

Return value

Formatted subtree.

String getSubTree (string name = 0)

Returns a subtree of a Json node as the non-formatted string.

Usage Example

To get the subtree of a Json node, do the following:

Source code(UnigineScript)

Json json = new Json();

json.addChild("child_0", 1);
json.addChild("child_1", 2.2);
json.addChild("child_2", "three");
Json object = json.addChild("object");
object.setObject(("1": 5, "4": 6, "2": 7));

string subTree = json.getSubTree();
log.message("the subtree is:%s\n", subTree);

In the console you see the following:

Output

the subtree is:{"child_0":1,"child_1":2.2,"child_2":"three","object":{"1":5,"2":7,"4":6}}

Arguments

string name - The name of a child node. If there is a name, the function returns formatted subtree for this child Json node.

Return value

Non-formatted subtree.

variable removeChild (variable var)

Removes the child Json node.

Arguments

variable var - Argument of one of the following types:
- Jsonjson - Json node.
- stringname - Name of the Json node.

Return value

Removed child Json node.

void setString (variable var)

Sets a string value and type to the current Json node. The function automatically casts number values to string type.

Arguments

variable var - Argument of one of the following types:
- stringvalue - string value.
- intnumber - integer value.
- doublenumber - double value.
- floatnumber - float value.

void copy (Json source)

Copies type, name and value from the source Json node to the current Json node and adds the source Json child nodes as child nodes to the current Json node.

Arguments

Json source - Source Json node.

void setNull ()

Sets null type to the current Json node.

void setArray ()

Sets array type to the current Json node and adds a given array as a child.

Usage Example

Adding an Array

The following example shows how to add an array to the Json node.

Source code(UnigineScript)

Json json = new Json();
Json array = json.addChild("array");
array.setArray((1,2.2,"3"));
array.addChild(NULL,"data_0");
array.addChild(NULL, 5);

The result is:

Output

{
  "array": [
    1,
    2.2,
    "3",
    "data_0",
    5
  ]
}

Adding an Array to Array

To add array to the array, just add an array as a child:

Source code(UnigineScript)

Json json = new Json();
Json array = json.addChild("array");
array.setArray((1,2.2,"3"));
array.addChild(NULL,"data_0");
array.addChild(NULL, 5); 
array.addChild(NULL,"array").setArray((5,6,7));

The result is:

Output

{
  "array": [
    1,
    2.2,
    "3",
    "data_0",
    5",
    [
      5,
      6,
      7
    ]
  ]
}

Adding an Object to Array

To add an object to array, do the following:

Source code(UnigineScript)

Json json = new Json();
Json array = json.addChild("array");
array.setArray((1,2.2,"3"));
array.addChild(NULL,"object").setObject(("one": 5, "two": 6, "three": 7));

The result is:

Output

{
  "array": [
    1,
    2.2,
    "3",
    {
      "one": 5,
      "three": 7,
      "two": 6
    }
  ]
}

Notice
                The setObject() function alphabetizes child nodes by using their names. 
              

int parse (string source)

Parses a given string into the Json node.

Usage Example

Source code(UnigineScript)

Json json = new Json();
json.addChild("child_0", 1);

Json json_2 = new Json();
json_2.parse(json.getSubTree());

Now the json_2 node contains:

Source code

{
  "child_0": 1
}

Arguments

string source - String to parse.

Return value

1 if the string was parsed successfully; otherwise, 0.

Json getParent ()

Returns the parent node of the current Json node.

Return value

Parent Json node.

void clear ()

Clears all data of the current Json node including type, value, name and all children. If the current Json node has a parent, it also removed from the parent Json node.

int isChild (string name)

Checks if a child node with a given name exists.

Arguments

string name - Name of the child node.

Return value

1 if a child with the provided name exists; otherwise, 0.

int save (string path)

Saves the Json node into a file with a given path.

Arguments

string path - Path to the file.

Return value

1 if the file was saved successfully; otherwise, 0.

int getBool ()

Reads a boolean value of the current Json node.

Return value

1 if the Json node has a bool type; otherwise, 0.

void setNumber (variable var)

Sets a number value and type to the current Json node.

Arguments

variable var - Argument of one of the following types:
- intnumber - integer value. For example, 5.
- doublenumber - double value. For example, 5.0.
- floatnumber - float value. For example, 5.0f.
- stringvalue - string with value. For example, "5".

string getName ()

Returns the name of the current Json node.

Return value

The name of the Json node.

Json find (string name)

Finds Json node by its name in current Json node tree.

Arguments

string name - Name of the Json node.

Return value

Founded Json node.

int isString ()

Returns a value indicating if the Json node has a string type.

Return value

1 if the Json has a string type; otherwise, 0.

int isObject ()

Returns a value indicating if the Json node has an object type.

Return value

1 if the Json has an object type; otherwise, 0.

void setObject ()

Adds a given object to the current Json node.

Usage Example

Adding an Object

To add an object to the Json node, do the following:

Source code(UnigineScript)

Json json = new Json();
Json object = json.addChild("object");
object.setObject(("1": 5, "4": 6, "2": 7, "3": 8));
object.addChild("child_0", "data_0");

The result is:

Output

{
  "object": {
    "1": 5,
    "2": 7,
    "3": 8,
    "4": 6,
    "child_0": "data_0"
  }
}

Notice
                  The setObject() function alphabetizes child nodes by using their names. 
                

Adding an Array to the Object

To add an array to the added object, do the following:

Source code(UnigineScript)

Json json = new Json();
Json object = json.addChild("object");
object.setObject(("1": 5, "4": 6, "2": 7, "3": 8));
object.addChild(class_remove(new Json("array"))).setArray((1,2,3));

The result is:

Output

{
  "object": {
    "1": 5,
    "2": 7,
    "3": 8,
    "4": 6,
    "array": [
      1,
      2,
      3
    ]
  }
}

Adding an Object to the Object

To add an object to the added object, do the following:

Source code(UnigineScript)

Json json = new Json();
Json object = json.addChild("object");
object.setObject(("1": 5, "4": 6, "2": 7, "3": 8));
object.addChild(class_remove(new Json("object"))).setObject(("one" : 1,"two" : 2,"three" : 3));

The result is:

Output

{
  "object": {
    "1": 5,
    "2": 7,
    "3": 8,
    "4": 6,
    "object": {
      "one": 1,
      "three": 3,
      "two": 2
    }
  }
}

int load (string path)

Loads the data to the current Json node from the file with a given path.

Arguments

string path - Path of the file.

Return value

1 if the Json node was loaded successfully; otherwise, 0.

Json addChild (string name, variable value, variable var)

Adds a new name-value pair as a child node to the current Json node.

Arguments

string name - Node name.
variable value - Argument of one of the following types:
- intvalue - integer value.
- floatvalue - float value.
- stringvalue - string value.
variable var - Argument of one of the following types:
- Jsonjson - Json node.
- stringname - Name of the Json node.

Return value

Child Json node.

int isBool ()

Returns a value indicating if the Json node has a bool type.

Return value

1 if the Json has a bool type; otherwise, 0.

void setBool (variable var)

Sets a boolean value and type to the current Json node.

Arguments

variable var - Argument of one of the following types:
- stringvalue - all strings except "true", set "false".
- intvalue - all int values except 0, set "true".
- doublevalue - all double values except 0.0, set "true".
- floatvalue - all float values except 0.0f, set "true".

Json getChild (variable var)

Returns the child node of the current Json node.

Arguments

variable var - Argument of one of the following types:
- stringname - Name of the Json node.
- intnumber - Number of the child of the Json node.

Return value

Child Json node.

double getNumber ()

Returns the number value of the current Json node.

Return value

Number value of the current Json node.

Last update: 2017-07-03

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