Package jflex.core
Class LexScan
- java.lang.Object
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- jflex.core.AbstractLexScan
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- jflex.core.LexScan
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public final class LexScan extends AbstractLexScan implements sym, java_cup.runtime.Scanner
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Nested Class Summary
Nested Classes Modifier and Type Class Description private static class
LexScan.ZzFlexStreamInfo
inner class used to store info for nested input streams
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Field Summary
Fields Modifier and Type Field Description (package private) int
action_line
(package private) java.lang.StringBuilder
actionText
(package private) int
balance
(package private) boolean
caseless
static int
CHARCLASS
static int
CHARCLASS_CODEPOINT
static int
COMMENT
(package private) int
commentbalance
static int
COPY
static int
CTOR_ARG
static int
EATWSPNL
(package private) boolean
inclusive_states
(package private) boolean
isYYEOF
static int
JAVA_CODE
(package private) boolean
macroDefinition
static int
MACROS
(package private) int
nextState
(package private) boolean
notUnix
static int
REGEXP
static int
REGEXP_CODEPOINT_SEQUENCE
static int
REGEXPSTART
static int
REPEATEXP
static int
STATELIST
static int
STATES
static int
STRING_CODEPOINT_SEQUENCE
static int
STRING_CONTENT
(package private) Timer
t
private long
yychar
Number of characters up to the start of the matched text.private int
yycolumn
Number of characters from the last newline up to the start of the matched text.static int
YYEOF
This character denotes the end of filestatic int
YYINITIAL
lexical statesprivate int
yyline
Number of newlines encountered up to the start of the matched text.private static int[]
ZZ_ACTION
Translates DFA states to action switch labels.private static java.lang.String
ZZ_ACTION_PACKED_0
private static int[]
ZZ_ATTRIBUTE
ZZ_ATTRIBUTE[aState] contains the attributes of stateaState
private static java.lang.String
ZZ_ATTRIBUTE_PACKED_0
private static int
ZZ_BUFFERSIZE
initial size of the lookahead bufferprivate static int[]
ZZ_CMAP_BLOCKS
Second-level tables for translating characters to character classesprivate static java.lang.String
ZZ_CMAP_BLOCKS_PACKED_0
private static int[]
ZZ_CMAP_TOP
Top-level table for translating characters to character classesprivate static java.lang.String
ZZ_CMAP_TOP_PACKED_0
private static java.lang.String[]
ZZ_ERROR_MSG
private static 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 integerprivate static int
ZZ_NO_MATCH
private static int
ZZ_PUSHBACK_2BIG
private static int[]
ZZ_ROWMAP
Translates a state to a row index in the transition tableprivate static java.lang.String
ZZ_ROWMAP_PACKED_0
private static int[]
ZZ_TRANS
The transition table of the DFAprivate static java.lang.String
ZZ_TRANS_PACKED_0
private static int
ZZ_UNKNOWN_ERROR
private boolean
zzAtBOL
Whether the scanner is currently at the beginning of a line.private boolean
zzAtEOF
Whether the scanner is at the end of file.private char[]
zzBuffer
this buffer contains the current text to be matched and is the source of the yytext() stringprivate int
zzCurrentPos
the current text position in the bufferprivate int
zzEndRead
endRead marks the last character in the buffer, that has been read from inputprivate boolean
zzEOFDone
Whether the user-EOF-code has already been executed.private int
zzFinalHighSurrogate
The number of occupied positions in zzBuffer beyond zzEndRead.private int
zzLexicalState
the current lexical stateprivate int
zzMarkedPos
the textposition at the last accepting stateprivate java.io.Reader
zzReader
the input deviceprivate int
zzStartRead
startRead marks the beginning of the yytext() string in the bufferprivate int
zzState
the current state of the DFAprivate java.util.Deque<LexScan.ZzFlexStreamInfo>
zzStreams
the stack of open (nested) input streams to read from-
Fields 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
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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 Constructor Description LexScan(java.io.Reader in)
Creates a new scanner
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description java_cup.runtime.Symbol
debug_next_token()
Same as next_token but also prints the token to standard out for debugging.private static java.lang.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
lexColumn()
protected int
lexLine()
protected void
lexPushStream(java.io.File f)
protected java.lang.String
lexText()
static void
main(java.lang.String[] argv)
Runs the scanner on input files.java_cup.runtime.Symbol
next_token()
Resumes scanning until the next regular expression is matched, the end of input is encountered or an I/O-Error occurs.boolean
yyatEOF()
Returns whether the scanner has reached the end of the reader it reads from.void
yybegin(int newState)
Enters a new lexical statechar
yycharat(int pos)
Returns the character at positionpos
from the matched text.void
yyclose()
Closes the input reader.int
yylength()
How many characters were matched.boolean
yymoreStreams()
Returns true iff there are still streams left to read from on the stream stack.void
yypopStream()
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.void
yypushStream(java.io.Reader reader)
Stores the current input stream on a stack, and reads from a new stream.void
yyreset(java.io.Reader reader)
Resets the scanner to read from a new input stream.private void
yyResetPosition()
Resets the input position.int
yystate()
Returns the current lexical state.java.lang.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[]
zzUnpackAction()
private static int
zzUnpackAction(java.lang.String packed, int offset, int[] result)
private static int[]
zzUnpackAttribute()
private static int
zzUnpackAttribute(java.lang.String packed, int offset, int[] result)
private static int[]
zzUnpackcmap_blocks()
private static int
zzUnpackcmap_blocks(java.lang.String packed, int offset, int[] result)
private static int[]
zzUnpackcmap_top()
private static int
zzUnpackcmap_top(java.lang.String packed, int offset, int[] result)
private static int[]
zzUnpackRowMap()
private static int
zzUnpackRowMap(java.lang.String packed, int offset, int[] result)
private static int[]
zzUnpackTrans()
private static int
zzUnpackTrans(java.lang.String packed, int offset, int[] result)
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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 Detail
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YYEOF
public static final int YYEOF
This character denotes the end of file- See Also:
- Constant Field Values
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ZZ_BUFFERSIZE
private static final int ZZ_BUFFERSIZE
initial size of the lookahead buffer- See Also:
- Constant Field Values
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YYINITIAL
public static final int YYINITIAL
lexical states- See Also:
- Constant Field Values
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COMMENT
public static final int COMMENT
- See Also:
- Constant Field Values
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STATELIST
public static final int STATELIST
- See Also:
- Constant Field Values
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MACROS
public static final int MACROS
- See Also:
- Constant Field Values
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REGEXPSTART
public static final int REGEXPSTART
- See Also:
- Constant Field Values
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REGEXP
public static final int REGEXP
- See Also:
- Constant Field Values
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JAVA_CODE
public static final int JAVA_CODE
- See Also:
- Constant Field Values
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STATES
public static final int STATES
- See Also:
- Constant Field Values
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STRING_CONTENT
public static final int STRING_CONTENT
- See Also:
- Constant Field Values
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CHARCLASS
public static final int CHARCLASS
- See Also:
- Constant Field Values
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COPY
public static final int COPY
- See Also:
- Constant Field Values
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REPEATEXP
public static final int REPEATEXP
- See Also:
- Constant Field Values
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EATWSPNL
public static final int EATWSPNL
- See Also:
- Constant Field Values
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CTOR_ARG
public static final int CTOR_ARG
- See Also:
- Constant Field Values
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REGEXP_CODEPOINT_SEQUENCE
public static final int REGEXP_CODEPOINT_SEQUENCE
- See Also:
- Constant Field Values
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STRING_CODEPOINT_SEQUENCE
public static final int STRING_CODEPOINT_SEQUENCE
- See Also:
- Constant Field Values
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CHARCLASS_CODEPOINT
public static final int CHARCLASS_CODEPOINT
- See Also:
- Constant Field Values
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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
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ZZ_CMAP_TOP
private static final int[] ZZ_CMAP_TOP
Top-level table for translating characters to character classes
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ZZ_CMAP_TOP_PACKED_0
private static final java.lang.String ZZ_CMAP_TOP_PACKED_0
- See Also:
- Constant Field Values
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ZZ_CMAP_BLOCKS
private static final int[] ZZ_CMAP_BLOCKS
Second-level tables for translating characters to character classes
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ZZ_CMAP_BLOCKS_PACKED_0
private static final java.lang.String ZZ_CMAP_BLOCKS_PACKED_0
- See Also:
- Constant Field Values
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ZZ_ACTION
private static final int[] ZZ_ACTION
Translates DFA states to action switch labels.
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ZZ_ACTION_PACKED_0
private static final java.lang.String ZZ_ACTION_PACKED_0
- See Also:
- Constant Field Values
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ZZ_ROWMAP
private static final int[] ZZ_ROWMAP
Translates a state to a row index in the transition table
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ZZ_ROWMAP_PACKED_0
private static final java.lang.String ZZ_ROWMAP_PACKED_0
- See Also:
- Constant Field Values
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ZZ_TRANS
private static final int[] ZZ_TRANS
The transition table of the DFA
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ZZ_TRANS_PACKED_0
private static final java.lang.String ZZ_TRANS_PACKED_0
- See Also:
- Constant Field Values
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ZZ_UNKNOWN_ERROR
private static final int ZZ_UNKNOWN_ERROR
- See Also:
- Constant Field Values
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ZZ_NO_MATCH
private static final int ZZ_NO_MATCH
- See Also:
- Constant Field Values
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ZZ_PUSHBACK_2BIG
private static final int ZZ_PUSHBACK_2BIG
- See Also:
- Constant Field Values
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ZZ_ERROR_MSG
private static final java.lang.String[] ZZ_ERROR_MSG
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ZZ_ATTRIBUTE
private static final int[] ZZ_ATTRIBUTE
ZZ_ATTRIBUTE[aState] contains the attributes of stateaState
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ZZ_ATTRIBUTE_PACKED_0
private static final java.lang.String ZZ_ATTRIBUTE_PACKED_0
- See Also:
- Constant Field Values
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zzReader
private java.io.Reader zzReader
the input device
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zzState
private int zzState
the current state of the DFA
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zzLexicalState
private int zzLexicalState
the current lexical state
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zzBuffer
private char[] zzBuffer
this buffer contains the current text to be matched and is the source of the yytext() string
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zzMarkedPos
private int zzMarkedPos
the textposition at the last accepting state
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zzCurrentPos
private int zzCurrentPos
the current text position in the buffer
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zzStartRead
private int zzStartRead
startRead marks the beginning of the yytext() string in the buffer
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zzEndRead
private int zzEndRead
endRead marks the last character in the buffer, that has been read from input
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zzAtEOF
private boolean zzAtEOF
Whether the scanner is at the end of file.- See Also:
yyatEOF()
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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.
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zzStreams
private java.util.Deque<LexScan.ZzFlexStreamInfo> zzStreams
the stack of open (nested) input streams to read from
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yyline
private int yyline
Number of newlines encountered up to the start of the matched text.
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yycolumn
private int yycolumn
Number of characters from the last newline up to the start of the matched text.
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yychar
private long yychar
Number of characters up to the start of the matched text.
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zzAtBOL
private boolean zzAtBOL
Whether the scanner is currently at the beginning of a line.
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zzEOFDone
private boolean zzEOFDone
Whether the user-EOF-code has already been executed.
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balance
int balance
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commentbalance
int commentbalance
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action_line
int action_line
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actionText
java.lang.StringBuilder actionText
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isYYEOF
boolean isYYEOF
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notUnix
boolean notUnix
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caseless
boolean caseless
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inclusive_states
boolean inclusive_states
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nextState
int nextState
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macroDefinition
boolean macroDefinition
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t
Timer t
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Method Detail
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zzUnpackcmap_top
private static int[] zzUnpackcmap_top()
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zzUnpackcmap_top
private static int zzUnpackcmap_top(java.lang.String packed, int offset, int[] result)
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zzUnpackcmap_blocks
private static int[] zzUnpackcmap_blocks()
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zzUnpackcmap_blocks
private static int zzUnpackcmap_blocks(java.lang.String packed, int offset, int[] result)
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zzUnpackAction
private static int[] zzUnpackAction()
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zzUnpackAction
private static int zzUnpackAction(java.lang.String packed, int offset, int[] result)
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zzUnpackRowMap
private static int[] zzUnpackRowMap()
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zzUnpackRowMap
private static int zzUnpackRowMap(java.lang.String packed, int offset, int[] result)
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zzUnpackTrans
private static int[] zzUnpackTrans()
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zzUnpackTrans
private static int zzUnpackTrans(java.lang.String packed, int offset, int[] result)
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zzUnpackAttribute
private static int[] zzUnpackAttribute()
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zzUnpackAttribute
private static int zzUnpackAttribute(java.lang.String packed, int offset, int[] result)
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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
protected java.lang.String lexText()
- Specified by:
lexText
in classAbstractLexScan
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lexPushStream
protected void lexPushStream(java.io.File f) throws java.io.IOException
- Specified by:
lexPushStream
in classAbstractLexScan
- Throws:
java.io.IOException
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zzCMap
private static int zzCMap(int input)
Translates raw input code points to DFA table row
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zzRefill
private boolean zzRefill() throws java.io.IOException
Refills the input buffer.- Returns:
false
, iff there was new input.- Throws:
java.io.IOException
- if any I/O-Error occurs
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yyclose
public final void yyclose() throws java.io.IOException
Closes the input reader.- Throws:
java.io.IOException
- if the reader could not be closed.
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yypushStream
public final void yypushStream(java.io.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()
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yypopStream
public final void yypopStream() throws java.io.IOException
Closes the current input stream and continues to read from the one on top of the stream stack.- Throws:
java.util.NoSuchElementException
- if there is no further stream to read from.java.io.IOException
- if there was an error in closing the stream.- See Also:
yypushStream(java.io.Reader)
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yymoreStreams
public final boolean yymoreStreams()
Returns true iff there are still streams left to read from on the stream stack.
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yyreset
public final void yyreset(java.io.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 toZZ_INITIAL
. Internal scan buffer is resized down to its initial length, if it has grown.- Parameters:
reader
- the new input stream- See Also:
yypushStream(java.io.Reader)
,yypopStream()
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yyResetPosition
private final void yyResetPosition()
Resets the input position.
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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
public final java.lang.String 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
private void zzDoEOF() throws java.io.IOException
Contains user EOF-code, which will be executed exactly once, when the end of file is reached- Throws:
java.io.IOException
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next_token
public java_cup.runtime.Symbol next_token() throws java.io.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 interfacejava_cup.runtime.Scanner
- Returns:
- the next token
- Throws:
java.io.IOException
- if any I/O-Error occurs
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getTokenName
private static java.lang.String getTokenName(int token)
Converts an int token code into the name of the token by reflection on the cup symbol class/interface sym
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debug_next_token
public java_cup.runtime.Symbol debug_next_token() throws java.io.IOException
Same as next_token but also prints the token to standard out for debugging.- Throws:
java.io.IOException
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main
public static void main(java.lang.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.
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