JSON Class Reference

Contains static methods for converting JSON-formatted text to and from var objects. More...

#include <juce_JSON.h>

Classes
class	FormatOptions
	Allows formatting var objects as JSON with various configurable options. More...

Public Types
enum class	Spacing { none , singleLine , multiLine }
enum class	Encoding { utf8 , ascii }

Static Public Member Functions
static Result	parse (const String &text, var &parsedResult)
	Parses a string of JSON-formatted text, and returns a result code containing any parse errors.
static var	parse (const String &text)
	Attempts to parse some JSON-formatted text, and returns the result as a var object.
static var	parse (const File &file)
	Attempts to parse some JSON-formatted text from a file, and returns the result as a var object.
static var	parse (InputStream &input)
	Attempts to parse some JSON-formatted text from a stream, and returns the result as a var object.
static String	toString (const var &objectToFormat, bool allOnOneLine=false, int maximumDecimalPlaces=15)
	Returns a string which contains a JSON-formatted representation of the var object.
static String	toString (const var &objectToFormat, const FormatOptions &formatOptions)
	Returns a string which contains a JSON-formatted representation of the var object, using formatting described by the FormatOptions parameter.
static var	fromString (StringRef)
	Parses a string that was created with the toString() method.
static void	writeToStream (OutputStream &output, const var &objectToFormat, bool allOnOneLine=false, int maximumDecimalPlaces=15)
	Writes a JSON-formatted representation of the var object to the given stream.
static void	writeToStream (OutputStream &output, const var &objectToFormat, const FormatOptions &formatOptions)
	Writes a JSON-formatted representation of the var object to the given stream, using formatting described by the FormatOptions parameter.
static String	escapeString (StringRef)
	Returns a version of a string with any extended characters escaped.
static Result	parseQuotedString (String::CharPointerType &text, var &result)
	Parses a quoted string-literal in JSON format, returning the un-escaped result in the result parameter, and an error message in case the content was illegal.

Detailed Description

Contains static methods for converting JSON-formatted text to and from var objects.

The var class is structurally compatible with JSON-formatted data, so these functions allow you to parse JSON into a var object, and to convert a var object to JSON-formatted text.

See also

var

Member Enumeration Documentation

Spacing

enum class JSON::Spacing

strong

Enumerator
none	All optional whitespace should be omitted.
singleLine	All output should be on a single line, but with some additional spacing, e.g. after commas and colons.
multiLine	Newlines and spaces will be included in the output, in order to make it easy to read for humans.

Encoding

enum class JSON::Encoding

strong

Enumerator
utf8	Use UTF-8 avoiding escape sequences for non-ASCII characters, this is the default behaviour.
ascii	Use ASCII characters only, unicode characters will be encoded using UTF-16 escape sequences.

Member Function Documentation

parse() [1/4]

static Result JSON::parse ( const String & text, var & parsedResult )

static

Parses a string of JSON-formatted text, and returns a result code containing any parse errors.

This will return the parsed structure in the parsedResult parameter, and will return a Result object to indicate whether parsing was successful, and if not, it will contain an error message.

If you're not interested in the error message, you can use one of the other shortcut parse methods, which simply return a var() if the parsing fails.

Note that this will only parse valid JSON, which means that the item given must be either an object or an array definition. If you want to also be able to parse any kind of primitive JSON object, use the fromString() method.

Referenced by midi_ci::Encodings::jsonFrom7BitText().

parse() [2/4]

static var JSON::parse ( const String & text )

static

Attempts to parse some JSON-formatted text, and returns the result as a var object.

If the parsing fails, this simply returns var() - if you need to find out more detail about the parse error, use the alternative parse() method which returns a Result.

Note that this will only parse valid JSON, which means that the item given must be either an object or an array definition. If you want to also be able to parse any kind of primitive JSON object, use the fromString() method.

parse() [3/4]

static var JSON::parse ( const File & file )

static

Attempts to parse some JSON-formatted text from a file, and returns the result as a var object.

Note that this is just a short-cut for reading the entire file into a string and parsing the result.

If the parsing fails, this simply returns var() - if you need to find out more detail about the parse error, use the alternative parse() method which returns a Result.

parse() [4/4]

static var JSON::parse ( InputStream & input )

static

Attempts to parse some JSON-formatted text from a stream, and returns the result as a var object.

Note that this is just a short-cut for reading the entire stream into a string and parsing the result.

If the parsing fails, this simply returns var() - if you need to find out more detail about the parse error, use the alternative parse() method which returns a Result.

toString() [1/2]

static String JSON::toString ( const var & objectToFormat, bool allOnOneLine = false, int maximumDecimalPlaces = 15 )

static

Returns a string which contains a JSON-formatted representation of the var object.

If allOnOneLine is true, the result will be compacted into a single line of text with no carriage-returns. If false, it will be laid-out in a more human-readable format. The maximumDecimalPlaces parameter determines the precision of floating point numbers in scientific notation.

See also

writeToStream

Referenced by midi_ci::Encodings::jsonTo7BitText().

toString() [2/2]

static String JSON::toString ( const var & objectToFormat, const FormatOptions & formatOptions )

static

Returns a string which contains a JSON-formatted representation of the var object, using formatting described by the FormatOptions parameter.

See also

writeToStream

fromString()

static var JSON::fromString ( StringRef )

static

Parses a string that was created with the toString() method.

This is slightly different to the parse() methods because they will reject primitive values and only accept array or object definitions, whereas this method will handle either.

writeToStream() [1/2]

static void JSON::writeToStream ( OutputStream & output, const var & objectToFormat, bool allOnOneLine = false, int maximumDecimalPlaces = 15 )

static

Writes a JSON-formatted representation of the var object to the given stream.

If allOnOneLine is true, the result will be compacted into a single line of text with no carriage-returns. If false, it will be laid-out in a more human-readable format. The maximumDecimalPlaces parameter determines the precision of floating point numbers in scientific notation.

See also

toString

writeToStream() [2/2]

static void JSON::writeToStream ( OutputStream & output, const var & objectToFormat, const FormatOptions & formatOptions )

static

Writes a JSON-formatted representation of the var object to the given stream, using formatting described by the FormatOptions parameter.

See also

toString

escapeString()

static String JSON::escapeString ( StringRef )

static

Returns a version of a string with any extended characters escaped.

parseQuotedString()

static Result JSON::parseQuotedString ( String::CharPointerType & text, var & result )

static

Parses a quoted string-literal in JSON format, returning the un-escaped result in the result parameter, and an error message in case the content was illegal.

This advances the text parameter, leaving it positioned after the closing quote.

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The documentation for this class was generated from the following file:

• juce_JSON.h