java.lang.Object
- org.json.JSONTokener

Direct Known Subclasses:

HTTPTokener, XMLTokener
```
public class JSONTokener
extends java.lang.Object
```
A JSONTokener takes a source string and extracts characters and tokens from it. It is used by the JSONObject and JSONArray constructors to parse JSON source strings.

Since:

Ptolemy II 10.0

Version:

$Id$, 2010-02-02

Author:

JSON.org

Constructor Summary

Constructors
Constructor	Description
`JSONTokener(java.io.Reader reader)`	Construct a JSONTokener from a reader.
`JSONTokener(java.lang.String s)`	Construct a JSONTokener from a string.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`back()`	Back up one character.
`static int`	`dehexchar(char c)`	Get the hex value of a character (base16).
`boolean`	`end()`
`boolean`	`more()`	Determine if the source string still contains characters that next() can consume.
`char`	`next()`	Get the next character in the source string.
`char`	`next(char c)`	Consume the next character, and check that it matches a specified character.
`java.lang.String`	`next(int n)`	Get the next n characters.
`char`	`nextClean()`	Get the next char in the string, skipping whitespace.
`java.lang.String`	`nextString(char quote)`	Return the characters up to the next close quote character.
`java.lang.String`	`nextTo(char d)`	Get the text up but not including the specified character or the end of line, whichever comes first.
`java.lang.String`	`nextTo(java.lang.String delimiters)`	Get the text up but not including one of the specified delimiter characters or the end of line, whichever comes first.
`java.lang.Object`	`nextValue()`	Get the next value.
`char`	`skipTo(char to)`	Skip characters until the next character is the requested character.
`JSONException`	`syntaxError(java.lang.String message)`	Make a JSONException to signal a syntax error.
`java.lang.String`	`toString()`	Make a printable string of this JSONTokener.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - JSONTokener
```
public JSONTokener(java.io.Reader reader)
```
    Construct a JSONTokener from a reader.
    
    Parameters:
    
    reader - A reader.
  - JSONTokener
```
public JSONTokener(java.lang.String s)
```
    Construct a JSONTokener from a string.
    
    Parameters:
    
    s - A source string.
- Method Detail
  - back
```
public void back()
          throws JSONException
```
    Back up one character. This provides a sort of lookahead capability, so that you can test for a digit or letter before attempting to parse the next number or identifier.
    
    Throws:
    
    JSONException
  - dehexchar
```
public static int dehexchar(char c)
```
    Get the hex value of a character (base16).
    
    Parameters:
    
    c - A character between '0' and '9' or between 'A' and 'F' or between 'a' and 'f'.
    
    Returns:
    
    An int between 0 and 15, or -1 if c was not a hex digit.
  - end
```
public boolean end()
```
  - more
```
public boolean more()
             throws JSONException
```
    Determine if the source string still contains characters that next() can consume.
    
    Returns:
    
    true if not yet at the end of the source.
    
    Throws:
    
    JSONException
  - next
```
public char next()
          throws JSONException
```
    Get the next character in the source string.
    
    Returns:
    
    The next character, or 0 if past the end of the source string.
    
    Throws:
    
    JSONException
  - next
```
public char next(char c)
          throws JSONException
```
    Consume the next character, and check that it matches a specified character.
    
    Parameters:
    
    c - The character to match.
    
    Returns:
    
    The character.
    
    Throws:
    
    JSONException - if the character does not match.
  - next
```
public java.lang.String next(int n)
                      throws JSONException
```
    Get the next n characters.
    
    Parameters:
    
    n - The number of characters to take.
    
    Returns:
    
    A string of n characters.
    
    Throws:
    
    JSONException - Substring bounds error if there are not n characters remaining in the source string.
  - nextClean
```
public char nextClean()
               throws JSONException
```
    Get the next char in the string, skipping whitespace.
    
    Returns:
    
    A character, or 0 if there are no more characters.
    
    Throws:
    
    JSONException
  - nextString
```
public java.lang.String nextString(char quote)
                            throws JSONException
```
    Return the characters up to the next close quote character. Backslash processing is done. The formal JSON format does not allow strings in single quotes, but an implementation is allowed to accept them.
    
    Parameters:
    
    quote - The quoting character, either " (double quote) or ' (single quote).
    
    Returns:
    
    A String.
    
    Throws:
    
    JSONException - Unterminated string.
  - nextTo
```
public java.lang.String nextTo(char d)
                        throws JSONException
```
    Get the text up but not including the specified character or the end of line, whichever comes first.
    
    Parameters:
    
    d - A delimiter character.
    
    Returns:
    
    A string.
    
    Throws:
    
    JSONException
  - nextTo
```
public java.lang.String nextTo(java.lang.String delimiters)
                        throws JSONException
```
    Get the text up but not including one of the specified delimiter characters or the end of line, whichever comes first.
    
    Parameters:
    
    delimiters - A set of delimiter characters.
    
    Returns:
    
    A string, trimmed.
    
    Throws:
    
    JSONException
  - nextValue
```
public java.lang.Object nextValue()
                           throws JSONException
```
    Get the next value. The value can be a Boolean, Double, Integer, JSONArray, JSONObject, Long, or String, or the JSONObject.NULL object.
    
    Returns:
    
    An object.
    
    Throws:
    
    JSONException - If syntax error.
  - skipTo
```
public char skipTo(char to)
            throws JSONException
```
    Skip characters until the next character is the requested character. If the requested character is not found, no characters are skipped.
    
    Parameters:
    
    to - A character to skip to.
    
    Returns:
    
    The requested character, or zero if the requested character is not found.
    
    Throws:
    
    JSONException
  - syntaxError
```
public JSONException syntaxError(java.lang.String message)
```
    Make a JSONException to signal a syntax error.
    
    Parameters:
    
    message - The error message.
    
    Returns:
    
    A JSONException object, suitable for throwing
  - toString
```
public java.lang.String toString()
```
    Make a printable string of this JSONTokener.
    
    Overrides:
    
    toString in class java.lang.Object
    
    Returns:
    
    " at {index} [character {character} line {line}]"

Class JSONTokener

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

JSONTokener

JSONTokener

Method Detail

back

dehexchar

end

more

next

next

next

nextClean

nextString

nextTo

nextTo

nextValue

skipTo

syntaxError

toString