Package jflex.core

Class LexScan

All Implemented Interfaces:
java_cup.runtime.Scanner, sym, ILexScan

public final class LexScan extends AbstractLexScan implements sym, java_cup.runtime.Scanner
  • Field Details

    • YYEOF

      public static final int YYEOF
      This character denotes the end of file
      See Also:
    • ZZ_BUFFERSIZE

      private static final int ZZ_BUFFERSIZE
      initial size of the lookahead buffer
      See Also:
    • YYINITIAL

      public static final int YYINITIAL
      lexical states
      See Also:
    • COMMENT

      public static final int COMMENT
      See Also:
    • STATELIST

      public static final int STATELIST
      See Also:
    • MACROS

      public static final int MACROS
      See Also:
    • REGEXPSTART

      public static final int REGEXPSTART
      See Also:
    • REGEXP

      public static final int REGEXP
      See Also:
    • JAVA_CODE

      public static final int JAVA_CODE
      See Also:
    • STATES

      public static final int STATES
      See Also:
    • STRING_CONTENT

      public static final int STRING_CONTENT
      See Also:
    • CHARCLASS

      public static final int CHARCLASS
      See Also:
    • COPY

      public static final int COPY
      See Also:
    • REPEATEXP

      public static final int REPEATEXP
      See Also:
    • EATWSPNL

      public static final int EATWSPNL
      See Also:
    • CTOR_ARG

      public static final int CTOR_ARG
      See Also:
    • REGEXP_CODEPOINT_SEQUENCE

      public static final int REGEXP_CODEPOINT_SEQUENCE
      See Also:
    • STRING_CODEPOINT_SEQUENCE

      public static final int STRING_CODEPOINT_SEQUENCE
      See Also:
    • CHARCLASS_CODEPOINT

      public static final int CHARCLASS_CODEPOINT
      See Also:
    • ZZ_LEXSTATE

      private static final int[] ZZ_LEXSTATE
      ZZ_LEXSTATE[l] is the state in the DFA for the lexical state l ZZ_LEXSTATE[l+1] is the state in the DFA for the lexical state l at the beginning of a line l is of the form l = 2*k, k a non negative integer
    • ZZ_CMAP_TOP

      private static final int[] ZZ_CMAP_TOP
      Top-level table for translating characters to character classes
    • ZZ_CMAP_TOP_PACKED_0

      private static final String ZZ_CMAP_TOP_PACKED_0
      See Also:
    • ZZ_CMAP_BLOCKS

      private static final int[] ZZ_CMAP_BLOCKS
      Second-level tables for translating characters to character classes
    • ZZ_CMAP_BLOCKS_PACKED_0

      private static final String ZZ_CMAP_BLOCKS_PACKED_0
      See Also:
    • ZZ_ACTION

      private static final int[] ZZ_ACTION
      Translates DFA states to action switch labels.
    • ZZ_ACTION_PACKED_0

      private static final String ZZ_ACTION_PACKED_0
      See Also:
    • ZZ_ROWMAP

      private static final int[] ZZ_ROWMAP
      Translates a state to a row index in the transition table
    • ZZ_ROWMAP_PACKED_0

      private static final String ZZ_ROWMAP_PACKED_0
      See Also:
    • ZZ_TRANS

      private static final int[] ZZ_TRANS
      The transition table of the DFA
    • ZZ_TRANS_PACKED_0

      private static final String ZZ_TRANS_PACKED_0
      See Also:
    • ZZ_UNKNOWN_ERROR

      private static final int ZZ_UNKNOWN_ERROR
      See Also:
    • ZZ_NO_MATCH

      private static final int ZZ_NO_MATCH
      See Also:
    • ZZ_PUSHBACK_2BIG

      private static final int ZZ_PUSHBACK_2BIG
      See Also:
    • ZZ_ERROR_MSG

      private static final String[] ZZ_ERROR_MSG
    • ZZ_ATTRIBUTE

      private static final int[] ZZ_ATTRIBUTE
      ZZ_ATTRIBUTE[aState] contains the attributes of state aState
    • ZZ_ATTRIBUTE_PACKED_0

      private static final String ZZ_ATTRIBUTE_PACKED_0
      See Also:
    • zzReader

      private Reader zzReader
      the input device
    • zzState

      private int zzState
      the current state of the DFA
    • zzLexicalState

      private int zzLexicalState
      the current lexical state
    • zzBuffer

      private char[] zzBuffer
      this buffer contains the current text to be matched and is the source of the yytext() string
    • zzMarkedPos

      private int zzMarkedPos
      the textposition at the last accepting state
    • zzCurrentPos

      private int zzCurrentPos
      the current text position in the buffer
    • zzStartRead

      private int zzStartRead
      startRead marks the beginning of the yytext() string in the buffer
    • zzEndRead

      private int zzEndRead
      endRead marks the last character in the buffer, that has been read from input
    • zzAtEOF

      private boolean zzAtEOF
      Whether the scanner is at the end of file.
      See Also:
    • zzFinalHighSurrogate

      private int zzFinalHighSurrogate
      The number of occupied positions in zzBuffer beyond zzEndRead. When a lead/high surrogate has been read from the input stream into the final zzBuffer position, this will have a value of 1; otherwise, it will have a value of 0.
    • zzStreams

      private Deque<LexScan.ZzFlexStreamInfo> zzStreams
      the stack of open (nested) input streams to read from
    • yyline

      private int yyline
      Number of newlines encountered up to the start of the matched text.
    • yycolumn

      private int yycolumn
      Number of characters from the last newline up to the start of the matched text.
    • yychar

      private long yychar
      Number of characters up to the start of the matched text.
    • zzAtBOL

      private boolean zzAtBOL
      Whether the scanner is currently at the beginning of a line.
    • zzEOFDone

      private boolean zzEOFDone
      Whether the user-EOF-code has already been executed.
    • balance

      int balance
    • commentbalance

      int commentbalance
    • action_line

      int action_line
    • actionText

      StringBuilder actionText
    • isYYEOF

      boolean isYYEOF
    • notUnix

      boolean notUnix
    • caseless

      boolean caseless
    • inclusive_states

      boolean inclusive_states
    • nextState

      int nextState
    • macroDefinition

      boolean macroDefinition
    • t

  • Constructor Details

    • LexScan

      public LexScan(Reader in)
      Creates a new scanner
      Parameters:
      in - the java.io.Reader to read input from.
  • Method Details

    • zzUnpackcmap_top

      private static int[] zzUnpackcmap_top()
    • zzUnpackcmap_top

      private static int zzUnpackcmap_top(String packed, int offset, int[] result)
    • zzUnpackcmap_blocks

      private static int[] zzUnpackcmap_blocks()
    • zzUnpackcmap_blocks

      private static int zzUnpackcmap_blocks(String packed, int offset, int[] result)
    • zzUnpackAction

      private static int[] zzUnpackAction()
    • zzUnpackAction

      private static int zzUnpackAction(String packed, int offset, int[] result)
    • zzUnpackRowMap

      private static int[] zzUnpackRowMap()
    • zzUnpackRowMap

      private static int zzUnpackRowMap(String packed, int offset, int[] result)
    • zzUnpackTrans

      private static int[] zzUnpackTrans()
    • zzUnpackTrans

      private static int zzUnpackTrans(String packed, int offset, int[] result)
    • zzUnpackAttribute

      private static int[] zzUnpackAttribute()
    • zzUnpackAttribute

      private static int zzUnpackAttribute(String packed, int offset, int[] result)
    • lexLine

      protected int lexLine()
      Specified by:
      lexLine in class AbstractLexScan
    • lexColumn

      protected int lexColumn()
      Specified by:
      lexColumn in class AbstractLexScan
    • lexText

      protected String lexText()
      Specified by:
      lexText in class AbstractLexScan
    • lexPushStream

      protected void lexPushStream(File f) throws IOException
      Specified by:
      lexPushStream in class AbstractLexScan
      Throws:
      IOException
    • zzCMap

      private static int zzCMap(int input)
      Translates raw input code points to DFA table row
    • zzRefill

      private boolean zzRefill() throws IOException
      Refills the input buffer.
      Returns:
      false, iff there was new input.
      Throws:
      IOException - if any I/O-Error occurs
    • yyclose

      public final void yyclose() throws IOException
      Closes the input reader.
      Throws:
      IOException - if the reader could not be closed.
    • yypushStream

      public final void yypushStream(Reader reader)
      Stores the current input stream on a stack, and reads from a new stream. Lexical state, line, char, and column counting remain untouched. The current input stream can be restored with yypopStream (usually in an <<EOF>> action).
      Parameters:
      reader - the new input stream to read from
      See Also:
    • yypopStream

      public final void yypopStream() throws IOException
      Closes the current input stream and continues to read from the one on top of the stream stack.
      Throws:
      NoSuchElementException - if there is no further stream to read from.
      IOException - if there was an error in closing the stream.
      See Also:
    • yymoreStreams

      public final boolean yymoreStreams()
      Returns true iff there are still streams left to read from on the stream stack.
    • yyreset

      public final void yyreset(Reader reader)
      Resets 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). Lexical state is set to ZZ_INITIAL. Internal scan buffer is resized down to its initial length, if it has grown.
      Parameters:
      reader - the new input stream
      See Also:
    • yyResetPosition

      private final void yyResetPosition()
      Resets the input position.
    • yyatEOF

      public final boolean yyatEOF()
      Returns whether the scanner has reached the end of the reader it reads from.
      Returns:
      whether the scanner has reached EOF.
    • yystate

      public final int yystate()
      Returns 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 String yytext()
      Returns the text matched by the current regular expression.
      Returns:
      the matched text.
    • yycharat

      public final char yycharat(int pos)
      Returns the character at position pos from the matched text. It is equivalent to yytext().charAt(pos), but faster
      Parameters:
      pos - 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()
      How many characters were matched.
      Returns:
      the length of the matched text region.
    • zzScanError

      private static void zzScanError(int errorCode)
      Reports an error that occured while scanning. In a wellformed scanner (no or only correct usage of yypushback(int) and a match-all fallback rule) this method will only be called with things that "Can't Possibly Happen". If this method is called, something is seriously wrong (e.g. a JFlex bug producing a faulty scanner etc.). Usual syntax/scanner level error handling should be done in error fallback rules.
      Parameters:
      errorCode - the code of the errormessage to display
    • 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()!
    • zzDoEOF

      private void zzDoEOF() throws IOException
      Contains user EOF-code, which will be executed exactly once, when the end of file is reached
      Throws:
      IOException
    • next_token

      public java_cup.runtime.Symbol next_token() throws IOException
      Resumes scanning until the next regular expression is matched, the end of input is encountered or an I/O-Error occurs.
      Specified by:
      next_token in interface java_cup.runtime.Scanner
      Returns:
      the next token
      Throws:
      IOException - if any I/O-Error occurs
    • getTokenName

      private static String getTokenName(int token)
      Converts an int token code into the name of the token by reflection on the cup symbol class/interface sym
    • debug_next_token

      public java_cup.runtime.Symbol debug_next_token() throws IOException
      Same as next_token but also prints the token to standard out for debugging.
      Throws:
      IOException
    • main

      public static void main(String[] argv)
      Runs the scanner on input files. This main method is the debugging routine for the scanner. It prints debugging information about each returned token to System.out until the end of file is reached, or an error occured.
      Parameters:
      argv - the command line, contains the filenames to run the scanner on.