Class JSONParser

java.lang.Object

nonapi.io.github.classgraph.types.Parser

nonapi.io.github.classgraph.json.JSONParser

final class JSONParser
extends Parser

A JSON parser, based on the PEG grammar found at: https://github.com/azatoth/PanPG/blob/master/grammars/JSON.peg

Constructor Summary

Constructors

Modifier	Constructor	Description
private	JSONParser(String string)	Constructor.

Method Summary

Modifier and Type	Method	Description
private int	getAndParseHexChar()	Get and parse a hexadecimal digit character.
private Object	parseJSON()	Parse a JSON type (object / array / value).
(package private) static Object	parseJSON(String str)	Parse a JSON object, array, string, value or object reference.
private JSONArray	parseJSONArray()	Array ← "[" ( JSON ( "," JSON )* / S? ) "]"
private JSONObject	parseJSONObject()	Parse a JSON Object.
private Number	parseNumber()	Parses and returns Integer, Long or Double type.
private CharSequence	parseString()	Parse a quoted/escaped JSON string.

Methods inherited from class Parser

advance, appendToToken, appendToToken, currToken, expect, getc, getPosition, getPositionInfo, getState, getSubsequence, getSubstring, hasMore, next, peek, peekExpect, peekMatches, setPosition, setState, skipWhitespace, toString

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Details

JSONParser

private JSONParser(String string)
            throws ParseException

Constructor.

Parameters:

string - the string

Throws:

ParseException - if parsing fails

Method Details

getAndParseHexChar

private int getAndParseHexChar()
                        throws ParseException

Get and parse a hexadecimal digit character.

Returns:

the hex char

Throws:

ParseException - if the character was not hexadecimal

parseString

private CharSequence parseString()
                          throws ParseException

Parse a quoted/escaped JSON string.

    String ← S? ["] ( [^ " \ U+0000-U+001F ] / Escape )* ["] S?

    Escape ← [\] ( [ " / \ b f n r t ] / UnicodeEscape )

    UnicodeEscape ← "u" [0-9A-Fa-f]{4}

Returns:

the char sequence

Throws:

ParseException - if the escape sequence was invalid

parseNumber

private Number parseNumber()
                    throws ParseException

Parses and returns Integer, Long or Double type.

    Number ← Minus? IntegralPart FractionalPart? ExponentPart?

    Minus ← "-"

    IntegralPart ← "0" / [1-9] [0-9]*

    FractionalPart ← "." [0-9]+

    ExponentPart ← ( "e" / "E" ) ( "+" / "-" )? [0-9]+

Returns:

the number

Throws:

ParseException - if parsing fails

parseJSONArray

private JSONArray parseJSONArray()
                          throws ParseException

    Array ← "[" ( JSON ( "," JSON )* / S? ) "]"

.

Returns:

the JSON array

Throws:

ParseException - if parsing fails

parseJSONObject

private JSONObject parseJSONObject()
                            throws ParseException

Parse a JSON Object.

    Object ← "{" ( String ":" JSON ( "," String ":" JSON )* / S? ) "}"

Returns:

the JSON object

Throws:

ParseException - if parsing fails

parseJSON

private Object parseJSON()
                  throws ParseException

Parse a JSON type (object / array / value).

String values will have CharSequence type. Numerical values will have Integer, Long or Double type. Can return null for JSON null value.

    JSON ← S? ( Object / Array / String / True / False / Null / Number ) S?

Returns:

the parsed JSON object

Throws:

ParseException - if parsing fails

parseJSON

static Object parseJSON(String str)
                 throws ParseException

Parse a JSON object, array, string, value or object reference.

Parameters:

str - the str

Returns:

the parsed JSON object

Throws:

ParseException - if parsing fails