Package org.drip.service.jsonparser

Class Yylex

java.lang.Object
org.drip.service.jsonparser.Yylex
public class Yylex
extends java.lang.Object
Yylex is an Adaptation of the Yylex Class from the RFC4627 compliant JSON Simple (https://code.google.com/p/json-simple/). It provides the following Functionality:
  • This character denotes the end of file
  • Lexical states
  • Lexical State - BEGIN
  • Number of newlines encountered up to the start of the matched text
  • The number of characters from the last newline up to the start of the matched text
  • zzAtBOL == true - the scanner is currently at the beginning of a line
  • Retrieve the Position
  • Create a new scanner. There is also Reader version of this constructor
  • Create a new scanner. There is also a InputStream version of this constructor
  • Close the input stream
  • Reset the scanner to read from a new input stream. Does not close the old reader
  • Return the current lexical state
  • Enter a new lexical state
  • Return the text matched by the current regular expression
  • Return the character at position pos from the matched text
  • Return the length of the matched text region
  • Push the specified amount of characters back into the input stream
  • Resume scanning until the next regular expression is matched, the end of input is encountered or an I/O-Error occurs

Module Computational Core Module
Library Computation Support
Project Environment, Product/Definition Containers, and Scenario/State Manipulation APIs
Package RFC4627 Compliant JSON Message Parser

Author:
Fang Yidong, Lakshmi Krishnamurthy

  • Field Summary

    Fields
    Modifier and Type Field Description
    static int STRING_BEGIN
    Lexical State - BEGIN
    static int YYEOF
    This character denotes the end of file
    static int YYINITIAL
    Lexical states

  • Constructor Summary

    Constructors
    Constructor Description
    Yylex​(java.io.Reader in)
    Create a new scanner.

  • Method Summary

    Modifier and Type Method Description
    void yybegin​(int newState)
    Enters a new lexical state
    char yycharat​(int position)
    Return the character at position pos from the matched text.
    void yyclose()
    Close the input stream.
    int yylength()
    Returns the length of the matched text region.
    Yytoken yylex()
    Resume scanning until the next regular expression is matched, the end of input is encountered or an I/O-Error occurs
    void yypushback​(int number)
    Pushes the specified amount of characters back into the input stream.
    void yyreset​(java.io.Reader reader)
    Reset the scanner to read from a new input stream.
    int yystate()
    Return the current lexical state.
    java.lang.String yytext()
    Return the text matched by the current regular expression.

    Methods inherited from class java.lang.Object

    equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Field Details

  • Constructor Details

    • Yylex

      public Yylex​(java.io.Reader in)
      Create a new scanner. There is also a InputStream version of this constructor.
      Parameters:
      in - The Reader to read input from.

  • Method Details

    • yyclose

      public final void yyclose() throws java.io.IOException
      Close the input stream.
      Throws:
      java.io.IOException - Thrown if the Inputs are Invalid

    • yyreset

      public final void yyreset​(java.io.Reader reader)
      Reset the scanner to read from a new input stream. Does not close the old reader. All internal variables are reset, the old input stream cannot be reused (internal buffer is discarded and lost).
      Parameters:
      reader - The new input stream

    • yystate

      public final int yystate()
      Return the current lexical state.
      Returns:
      The Current Lexical State.

    • yybegin

      public final void yybegin​(int newState)
      Enters a new lexical state
      Parameters:
      newState - the new lexical state

    • yytext

      public final java.lang.String yytext()
      Return the text matched by the current regular expression.
      Returns:
      The Text.

    • yycharat

      public final char yycharat​(int position)
      Return the character at position pos from the matched text. It is equivalent to yytext().charAt(pos), but faster
      Parameters:
      position - the position of the character to fetch. A value from 0 to yylength()-1.
      Returns:
      the character at position pos

    • yylength

      public final int yylength()
      Returns the length of the matched text region.
      Returns:
      The Length.

    • yypushback

      public void yypushback​(int number)
      Pushes the specified amount of characters back into the input stream. They will be read again by then next call of the scanning method
      Parameters:
      number - the number of characters to be read again. This number must not be greater than yylength()!

    • yylex

      public Yytoken yylex() throws java.io.IOException, ParseException
      Resume scanning until the next regular expression is matched, the end of input is encountered or an I/O-Error occurs
      Returns:
      the next token
      Throws:
      java.io.IOException - if any I/O-Error occurs
      ParseException - Thrown if Inputs are Invalid