Groovy Documentation

## org.codehaus.groovy.grails.web.json
[Java] Class JSONTokener

    java.lang.Object
      org.codehaus.groovy.grails.web.json.JSONTokener

    public class JSONTokener

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.

Authors:
  JSON.org

Version:
  2

Constructor Summary
`JSONTokener(java.lang.String s)` Construct a JSONTokener from a string.

Method Summary
`void` | `back()` Back up one character.
`static int` | `dehexchar(char c)` Get the hex value of a character (base16).
`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 and comments (slashslash, slashstar, and hash).
`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 delimeter characters or the end of line, whichever comes first.
`java.lang.Object` | `nextValue()` Get the next value.
`void` | `skipPast(java.lang.String to)` Skip characters until past the requested string.
`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
java.lang.Object#wait(), java.lang.Object#wait(long), java.lang.Object#wait(long, int), java.lang.Object#equals(java.lang.Object), java.lang.Object#toString(), java.lang.Object#hashCode(), java.lang.Object#getClass(), java.lang.Object#notify(), java.lang.Object#notifyAll()

Constructor Detail

### JSONTokener

    public JSONTokener(java.lang.String s)

  Construct a JSONTokener from a string.
  Parameters:
    `s` - A source string.

Method Detail

### back

    public void back()

  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.

### 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.

### more

    public boolean more()

  Determine if the source string still contains characters that next() can consume.
  Returns:
    true if not yet at the end of the source.

### next

    public char next()

  Get the next character in the source string.
  Returns:
    The next character, or 0 if past the end of the source string.

### next

    public char next(char c)

  Consume the next character, and check that it matches a specified character.
  throws:
    JSONException if the character does not match.
  Parameters:
    `c` - The character to match.
  Returns:
    The character.

### next

    public java.lang.String next(int n)

  Get the next n characters.
  throws:
    JSONException Substring bounds error if there are not n characters remaining in the source string.
  Parameters:
    `n` - The number of characters to take.
  Returns:
    A string of n characters.

### nextClean

    public char nextClean()

  Get the next char in the string, skipping whitespace and comments (slashslash, slashstar, and hash).
  throws:
    JSONException
  Returns:
    A character, or 0 if there are no more characters.

### nextString

    public java.lang.String nextString(char quote)

  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.
  throws:
    JSONException Unterminated string.
  Parameters:
    `quote` - The quoting character, either `"` (double quote) or `'` (single quote).
  Returns:
    A String.

### nextTo

    public java.lang.String nextTo(char d)

  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.

### nextTo

    public java.lang.String nextTo(java.lang.String delimiters)

  Get the text up but not including one of the specified delimeter characters or the end of line, whichever comes first.
  Parameters:
    `delimiters` - A set of delimiter characters.
  Returns:
    A string, trimmed.

### nextValue

    public java.lang.Object nextValue()

  Get the next value. The value can be a Boolean, Double, Integer, JSONArray, JSONObject, Long, or String, or the JSONObject.NULL object.
  throws:
    JSONException If syntax error.
  Returns:
    An object.

### skipPast

    public void skipPast(java.lang.String to)

  Skip characters until past the requested string. If it is not found, we are left at the end of the source.
  Parameters:
    `to` - A string to skip past.

### skipTo

    public char skipTo(char to)

  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.

### 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

    @Override
    public java.lang.String toString()

  Make a printable string of this JSONTokener.
  Returns:
    " at character [this.myIndex] of [this.mySource]"

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