Package jflex.core
Class LexScan
java.lang.Object
jflex.core.AbstractLexScan
jflex.core.LexScan
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Nested Class Summary
Nested ClassesModifier and TypeClassDescriptionprivate static final class
inner class used to store info for nested input streams -
Field Summary
FieldsModifier and TypeFieldDescription(package private) int
(package private) StringBuilder
(package private) int
(package private) boolean
static final int
static final int
static final int
(package private) int
static final int
static final int
static final int
(package private) boolean
(package private) boolean
static final int
(package private) boolean
static final int
(package private) int
(package private) boolean
static final int
static final int
static final int
static final int
static final int
static final int
static final int
static final int
(package private) Timer
private long
Number of characters up to the start of the matched text.private int
Number of characters from the last newline up to the start of the matched text.static final int
This character denotes the end of filestatic final int
lexical statesprivate int
Number of newlines encountered up to the start of the matched text.private static final int[]
Translates DFA states to action switch labels.private static final String
private static final int[]
ZZ_ATTRIBUTE[aState] contains the attributes of stateaState
private static final String
private static final int
initial size of the lookahead bufferprivate static final int[]
Second-level tables for translating characters to character classesprivate static final String
private static final int[]
Top-level table for translating characters to character classesprivate static final String
private static final String[]
private static final int[]
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 integerprivate static final int
private static final int
private static final int[]
Translates a state to a row index in the transition tableprivate static final String
private static final int[]
The transition table of the DFAprivate static final String
private static final int
private boolean
Whether the scanner is currently at the beginning of a line.private boolean
Whether the scanner is at the end of file.private char[]
this buffer contains the current text to be matched and is the source of the yytext() stringprivate int
the current text position in the bufferprivate int
endRead marks the last character in the buffer, that has been read from inputprivate boolean
Whether the user-EOF-code has already been executed.private int
The number of occupied positions in zzBuffer beyond zzEndRead.private int
the current lexical stateprivate int
the textposition at the last accepting stateprivate Reader
the input deviceprivate int
startRead marks the beginning of the yytext() string in the bufferprivate int
the current state of the DFAprivate Deque
<LexScan.ZzFlexStreamInfo> the stack of open (nested) input streams to read fromFields inherited from class jflex.core.AbstractLexScan
actions, bolUsed, bufferSize, charClasses, charCount, classCode, className, columnCount, ctorArgs, ctorTypes, cup2Compatible, cupCompatible, cupDebug, cupSymbol, debugOption, eofclose, eofCode, eofThrow, eofVal, file, functionName, initCode, initThrow, isAbstract, isExtending, isFinal, isImplementing, isInteger, isIntWrap, isPublic, lexThrow, lineCount, scanErrorException, standalone, states, string, tokenType, unicodeProperties, userCode, visibility
Fields inherited from interface jflex.core.sym
ACTION, BANG, BAR, CCLASS, CCLASSNOT, CCLASSOP, CHAR, CHAR_I, CLOSEBRACKET, CLOSECLASS, COMMA, CONCAT, DASH, DELIMITER, DIFFERENCE, DIGITCLASS, DIGITCLASSNOT, DOLLAR, EOF, EOFRULE, EQUALS, error, HAT, IDENT, INTERSECTION, JLETTERCLASS, JLETTERDIGITCLASS, LBRACE, LESSTHAN, LETTERCLASS, LOOKAHEAD, LOWERCLASS, MACROUSE, MORETHAN, NEWLINE, NOACTION, OPENBRACKET, OPENCLASS, PLUS, POINT, PRIMCLASS, QUESTION, RBRACE, REGEXPEND, REPEAT, STAR, STRING, STRING_I, SYMMETRICDIFFERENCE, terminalNames, TILDE, UNION, UNIPROPCCLASS, UNIPROPCCLASSNOT, UPPERCLASS, USERCODE, WHITESPACECLASS, WHITESPACECLASSNOT, WORDCLASS, WORDCLASSNOT
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionjava_cup.runtime.Symbol
Same as next_token but also prints the token to standard out for debugging.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 symprotected int
protected int
lexLine()
protected void
protected String
lexText()
static void
Runs the scanner on input files.java_cup.runtime.Symbol
Resumes scanning until the next regular expression is matched, the end of input is encountered or an I/O-Error occurs.final boolean
yyatEOF()
Returns whether the scanner has reached the end of the reader it reads from.final void
yybegin
(int newState) Enters a new lexical statefinal char
yycharat
(int pos) Returns the character at positionpos
from the matched text.final void
yyclose()
Closes the input reader.final int
yylength()
How many characters were matched.final boolean
Returns true iff there are still streams left to read from on the stream stack.final void
Closes the current input stream and continues to read from the one on top of the stream stack.void
yypushback
(int number) Pushes the specified amount of characters back into the input stream.final void
yypushStream
(Reader reader) Stores the current input stream on a stack, and reads from a new stream.final void
Resets the scanner to read from a new input stream.private final void
Resets the input position.final int
yystate()
Returns the current lexical state.final String
yytext()
Returns the text matched by the current regular expression.private static int
zzCMap
(int input) Translates raw input code points to DFA table rowprivate void
zzDoEOF()
Contains user EOF-code, which will be executed exactly once, when the end of file is reachedprivate boolean
zzRefill()
Refills the input buffer.private static void
zzScanError
(int errorCode) Reports an error that occured while scanning.private static int[]
private static int
zzUnpackAction
(String packed, int offset, int[] result) private static int[]
private static int
zzUnpackAttribute
(String packed, int offset, int[] result) private static int[]
private static int
zzUnpackcmap_blocks
(String packed, int offset, int[] result) private static int[]
private static int
zzUnpackcmap_top
(String packed, int offset, int[] result) private static int[]
private static int
zzUnpackRowMap
(String packed, int offset, int[] result) private static int[]
private static int
zzUnpackTrans
(String packed, int offset, int[] result) Methods inherited from class jflex.core.AbstractLexScan
actions, bolUsed, bufferSize, charCount, classCode, className, columnCount, conc, concExc, ctorArg, ctorArgsCount, ctorType, cup2Compatible, cupCompatible, cupDebug, cupSymbol, currentLine, debugOption, eofclose, eofCode, eofThrow, eofVal, file, functionName, getCharClasses, getStateNumber, getUnicodeProperties, includeFile, initCode, initThrow, initUnicodeCharClasses, isAbstract, isColumnCount, isExtending, isFinal, isImplementing, isInteger, isIntWrap, isPublic, lexThrow, lineCount, makeMacroIdent, popFile, populateDefaultVersionUnicodeProperties, scanErrorException, setFile, standalone, stateNames, symbol, symbol, symbol_countUpdate, tokenType, userCode, visibility
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Field Details
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YYEOF
public static final int YYEOFThis character denotes the end of file- See Also:
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ZZ_BUFFERSIZE
private static final int ZZ_BUFFERSIZEinitial size of the lookahead buffer- See Also:
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YYINITIAL
public static final int YYINITIALlexical states- See Also:
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COMMENT
public static final int COMMENT- See Also:
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STATELIST
public static final int STATELIST- See Also:
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MACROS
public static final int MACROS- See Also:
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REGEXPSTART
public static final int REGEXPSTART- See Also:
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REGEXP
public static final int REGEXP- See Also:
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JAVA_CODE
public static final int JAVA_CODE- See Also:
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STATES
public static final int STATES- See Also:
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STRING_CONTENT
public static final int STRING_CONTENT- See Also:
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CHARCLASS
public static final int CHARCLASS- See Also:
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COPY
public static final int COPY- See Also:
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REPEATEXP
public static final int REPEATEXP- See Also:
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EATWSPNL
public static final int EATWSPNL- See Also:
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CTOR_ARG
public static final int CTOR_ARG- See Also:
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REGEXP_CODEPOINT_SEQUENCE
public static final int REGEXP_CODEPOINT_SEQUENCE- See Also:
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STRING_CODEPOINT_SEQUENCE
public static final int STRING_CODEPOINT_SEQUENCE- See Also:
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CHARCLASS_CODEPOINT
public static final int CHARCLASS_CODEPOINT- See Also:
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ZZ_LEXSTATE
private static final int[] ZZ_LEXSTATEZZ_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_TOPTop-level table for translating characters to character classes -
ZZ_CMAP_TOP_PACKED_0
- See Also:
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ZZ_CMAP_BLOCKS
private static final int[] ZZ_CMAP_BLOCKSSecond-level tables for translating characters to character classes -
ZZ_CMAP_BLOCKS_PACKED_0
- See Also:
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ZZ_ACTION
private static final int[] ZZ_ACTIONTranslates DFA states to action switch labels. -
ZZ_ACTION_PACKED_0
- See Also:
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ZZ_ROWMAP
private static final int[] ZZ_ROWMAPTranslates a state to a row index in the transition table -
ZZ_ROWMAP_PACKED_0
- See Also:
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ZZ_TRANS
private static final int[] ZZ_TRANSThe transition table of the DFA -
ZZ_TRANS_PACKED_0
- See Also:
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ZZ_UNKNOWN_ERROR
private static final int ZZ_UNKNOWN_ERROR- See Also:
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ZZ_NO_MATCH
private static final int ZZ_NO_MATCH- See Also:
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ZZ_PUSHBACK_2BIG
private static final int ZZ_PUSHBACK_2BIG- See Also:
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ZZ_ERROR_MSG
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ZZ_ATTRIBUTE
private static final int[] ZZ_ATTRIBUTEZZ_ATTRIBUTE[aState] contains the attributes of stateaState
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ZZ_ATTRIBUTE_PACKED_0
- See Also:
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zzReader
the input device -
zzState
private int zzStatethe current state of the DFA -
zzLexicalState
private int zzLexicalStatethe current lexical state -
zzBuffer
private char[] zzBufferthis buffer contains the current text to be matched and is the source of the yytext() string -
zzMarkedPos
private int zzMarkedPosthe textposition at the last accepting state -
zzCurrentPos
private int zzCurrentPosthe current text position in the buffer -
zzStartRead
private int zzStartReadstartRead marks the beginning of the yytext() string in the buffer -
zzEndRead
private int zzEndReadendRead marks the last character in the buffer, that has been read from input -
zzAtEOF
private boolean zzAtEOFWhether the scanner is at the end of file.- See Also:
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zzFinalHighSurrogate
private int zzFinalHighSurrogateThe 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
the stack of open (nested) input streams to read from -
yyline
private int yylineNumber of newlines encountered up to the start of the matched text. -
yycolumn
private int yycolumnNumber of characters from the last newline up to the start of the matched text. -
yychar
private long yycharNumber of characters up to the start of the matched text. -
zzAtBOL
private boolean zzAtBOLWhether the scanner is currently at the beginning of a line. -
zzEOFDone
private boolean zzEOFDoneWhether 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
Timer t
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Constructor Details
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LexScan
Creates a new scanner- Parameters:
in
- the java.io.Reader to read input from.
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Method Details
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zzUnpackcmap_top
private static int[] zzUnpackcmap_top() -
zzUnpackcmap_top
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zzUnpackcmap_blocks
private static int[] zzUnpackcmap_blocks() -
zzUnpackcmap_blocks
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zzUnpackAction
private static int[] zzUnpackAction() -
zzUnpackAction
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zzUnpackRowMap
private static int[] zzUnpackRowMap() -
zzUnpackRowMap
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zzUnpackTrans
private static int[] zzUnpackTrans() -
zzUnpackTrans
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zzUnpackAttribute
private static int[] zzUnpackAttribute() -
zzUnpackAttribute
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lexLine
protected int lexLine()- Specified by:
lexLine
in classAbstractLexScan
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lexColumn
protected int lexColumn()- Specified by:
lexColumn
in classAbstractLexScan
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lexText
- Specified by:
lexText
in classAbstractLexScan
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lexPushStream
- Specified by:
lexPushStream
in classAbstractLexScan
- Throws:
IOException
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zzCMap
private static int zzCMap(int input) Translates raw input code points to DFA table row -
zzRefill
Refills the input buffer.- Returns:
false
, iff there was new input.- Throws:
IOException
- if any I/O-Error occurs
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yyclose
Closes the input reader.- Throws:
IOException
- if the reader could not be closed.
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yypushStream
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:
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yypopStream
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:
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yymoreStreams
public final boolean yymoreStreams()Returns true iff there are still streams left to read from on the stream stack. -
yyreset
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 toZZ_INITIAL
. Internal scan buffer is resized down to its initial length, if it has grown.- Parameters:
reader
- the new input stream- See Also:
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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.
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yystate
public final int yystate()Returns the current lexical state.- Returns:
- the current lexical state.
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yybegin
public final void yybegin(int newState) Enters a new lexical state- Parameters:
newState
- the new lexical state
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yytext
Returns the text matched by the current regular expression.- Returns:
- the matched text.
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yycharat
public final char yycharat(int pos) Returns the character at positionpos
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
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yylength
public final int yylength()How many characters were matched.- Returns:
- the length of the matched text region.
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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
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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()!
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zzDoEOF
Contains user EOF-code, which will be executed exactly once, when the end of file is reached- Throws:
IOException
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next_token
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 interfacejava_cup.runtime.Scanner
- Returns:
- the next token
- Throws:
IOException
- if any I/O-Error occurs
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getTokenName
Converts an int token code into the name of the token by reflection on the cup symbol class/interface sym -
debug_next_token
Same as next_token but also prints the token to standard out for debugging.- Throws:
IOException
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main
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.
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