mirror of
https://github.com/godotengine/godot
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132 lines
6.5 KiB
XML
132 lines
6.5 KiB
XML
<?xml version="1.0" encoding="UTF-8" ?>
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<class name="JSON" inherits="Resource" version="4.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
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<brief_description>
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Helper class for creating and parsing JSON data.
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</brief_description>
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<description>
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The [JSON] enables all data types to be converted to and from a JSON string. This useful for serializing data to save to a file or send over the network.
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[method stringify] is used to convert any data type into a JSON string.
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[method parse] is used to convert any existing JSON data into a [Variant] that can be used within Godot. If successfully parsed, use [member data] to retrieve the [Variant], and use [code]typeof[/code] to check if the Variant's type is what you expect. JSON Objects are converted into a [Dictionary], but JSON data can be used to store [Array]s, numbers, [String]s and even just a boolean.
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[b]Example[/b]
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[codeblock]
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var data_to_send = ["a", "b", "c"]
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var json_string = JSON.stringify(data_to_send)
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# Save data
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# ...
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# Retrieve data
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var error = json.parse(json_string)
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if error == OK:
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var data_received = json.data
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if typeof(data_received) == TYPE_ARRAY:
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print(data_received) # Prints array
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else:
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print("Unexpected data")
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else:
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print("JSON Parse Error: ", json.get_error_message(), " in ", json_string, " at line ", json.get_error_line())
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[/codeblock]
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Alternatively, you can parse string using the static [method parse_string] method, but it doesn't allow to handle errors.
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[codeblock]
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var data = JSON.parse_string(json_string) # Returns null if parsing failed.
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[/codeblock]
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[b]Note:[/b] Both parse methods do not fully comply with the JSON specification:
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- Trailing commas in arrays or objects are ignored, instead of causing a parser error.
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- New line and tab characters are accepted in string literals, and are treated like their corresponding escape sequences [code]\n[/code] and [code]\t[/code].
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- Numbers are parsed using [method String.to_float] which is generally more lax than the JSON specification.
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- Certain errors, such as invalid Unicode sequences, do not cause a parser error. Instead, the string is cleansed and an error is logged to the console.
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</description>
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<tutorials>
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</tutorials>
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<methods>
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<method name="get_error_line" qualifiers="const">
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<return type="int" />
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<description>
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Returns [code]0[/code] if the last call to [method parse] was successful, or the line number where the parse failed.
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</description>
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</method>
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<method name="get_error_message" qualifiers="const">
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<return type="String" />
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<description>
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Returns an empty string if the last call to [method parse] was successful, or the error message if it failed.
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</description>
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</method>
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<method name="get_parsed_text" qualifiers="const">
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<return type="String" />
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<description>
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Return the text parsed by [method parse] as long as the function is instructed to keep it.
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</description>
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</method>
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<method name="parse">
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<return type="int" enum="Error" />
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<param index="0" name="json_text" type="String" />
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<param index="1" name="keep_text" type="bool" default="false" />
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<description>
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Attempts to parse the [param json_text] provided.
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Returns an [enum Error]. If the parse was successful, it returns [constant OK] and the result can be retrieved using [member data]. If unsuccessful, use [method get_error_line] and [method get_error_message] for identifying the source of the failure.
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Non-static variant of [method parse_string], if you want custom error handling.
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The optional [param keep_text] argument instructs the parser to keep a copy of the original text. This text can be obtained later by using the [method get_parsed_text] function and is used when saving the resource (instead of generating new text from [member data]).
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</description>
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</method>
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<method name="parse_string" qualifiers="static">
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<return type="Variant" />
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<param index="0" name="json_string" type="String" />
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<description>
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Attempts to parse the [param json_string] provided and returns the parsed data. Returns [code]null[/code] if parse failed.
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</description>
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</method>
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<method name="stringify" qualifiers="static">
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<return type="String" />
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<param index="0" name="data" type="Variant" />
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<param index="1" name="indent" type="String" default="""" />
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<param index="2" name="sort_keys" type="bool" default="true" />
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<param index="3" name="full_precision" type="bool" default="false" />
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<description>
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Converts a [Variant] var to JSON text and returns the result. Useful for serializing data to store or send over the network.
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[b]Note:[/b] The JSON specification does not define integer or float types, but only a [i]number[/i] type. Therefore, converting a Variant to JSON text will convert all numerical values to [float] types.
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[b]Note:[/b] If [param full_precision] is [code]true[/code], when stringifying floats, the unreliable digits are stringified in addition to the reliable digits to guarantee exact decoding.
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The [param indent] parameter controls if and how something is indented, the string used for this parameter will be used where there should be an indent in the output, even spaces like [code]" "[/code] will work. [code]\t[/code] and [code]\n[/code] can also be used for a tab indent, or to make a newline for each indent respectively.
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[b]Example output:[/b]
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[codeblock]
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## JSON.stringify(my_dictionary)
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{"name":"my_dictionary","version":"1.0.0","entities":[{"name":"entity_0","value":"value_0"},{"name":"entity_1","value":"value_1"}]}
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## JSON.stringify(my_dictionary, "\t")
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{
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"name": "my_dictionary",
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"version": "1.0.0",
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"entities": [
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{
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"name": "entity_0",
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"value": "value_0"
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},
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{
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"name": "entity_1",
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"value": "value_1"
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}
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]
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}
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## JSON.stringify(my_dictionary, "...")
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{
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..."name": "my_dictionary",
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..."version": "1.0.0",
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..."entities": [
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......{
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........."name": "entity_0",
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........."value": "value_0"
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......},
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......{
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........."name": "entity_1",
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........."value": "value_1"
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......}
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...]
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}
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[/codeblock]
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</description>
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</method>
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</methods>
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<members>
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<member name="data" type="Variant" setter="set_data" getter="get_data" default="null">
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Contains the parsed JSON data in [Variant] form.
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</member>
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</members>
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</class>
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