Class UCode_CharStream
java.lang.Object
org.apache.derby.impl.sql.compile.UCode_CharStream
- All Implemented Interfaces:
CharStream
An implementation of interface CharStream, where the stream is assumed to
contain only Unicode characters.
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Field Summary
FieldsModifier and TypeFieldDescription(package private) int
private int[]
private char[]
private int[]
int
(package private) int
(package private) int
(package private) int[]
private int
private int
private Reader
private int
private int
private char[]
private int
private boolean
private boolean
static final boolean
(package private) int
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Constructor Summary
ConstructorsConstructorDescriptionUCode_CharStream
(InputStream dstream, int startline, int startcolumn) UCode_CharStream
(InputStream dstream, int startline, int startcolumn, int buffersize) UCode_CharStream
(Reader dstream, int startline, int startcolumn) UCode_CharStream
(Reader dstream, int startline, int startcolumn, int buffersize) -
Method Summary
Modifier and TypeMethodDescriptionvoid
adjustBeginLineColumn
(int newLine, int newCol) Method to adjust line and column numbers for the start of a token.final void
backup
(int amount) Backs up the input stream by amount steps.char
Returns the next character that marks the beginning of the next token.void
Done()
The lexer calls this function to indicate that it is done with the stream and hence implementations can free any resources held by this class.private void
ExpandBuff
(boolean wrapAround) private void
FillBuff()
final int
Returns the column number of the first character for current token (being matched after the last call to BeginTOken).final int
Returns the line number of the first character for current token (being matched after the last call to BeginTOken).final int
final int
Deprecated.final int
Returns the column number of the last character for current token (being matched after the last call to BeginTOken).final int
Returns the line number of the last character for current token (being matched after the last call to BeginTOken).final int
final String
GetImage()
Returns a string made up of characters from the marked token beginning to the current buffer position.final int
getLine()
Deprecated.final char[]
GetSuffix
(int len) Returns an array of characters that make up the suffix of length 'len' for the currently matched token.final char
readChar()
Returns the next character from the selected input.private char
ReadChar()
void
ReInit
(InputStream dstream, int startline, int startcolumn) void
ReInit
(InputStream dstream, int startline, int startcolumn, int buffersize) void
void
private void
UpdateLineColumn
(char c)
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Field Details
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charCnt
int charCnt -
charOffset
int[] charOffset -
staticFlag
public static final boolean staticFlag- See Also:
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bufpos
public int bufpos -
bufsize
int bufsize -
available
int available -
tokenBegin
int tokenBegin -
bufline
private int[] bufline -
bufcolumn
private int[] bufcolumn -
column
private int column -
line
private int line -
prevCharIsCR
private boolean prevCharIsCR -
prevCharIsLF
private boolean prevCharIsLF -
inputStream
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nextCharBuf
private char[] nextCharBuf -
buffer
private char[] buffer -
maxNextCharInd
private int maxNextCharInd -
nextCharInd
private int nextCharInd -
inBuf
private int inBuf
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Constructor Details
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UCode_CharStream
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UCode_CharStream
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UCode_CharStream
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UCode_CharStream
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Method Details
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ExpandBuff
private void ExpandBuff(boolean wrapAround) -
FillBuff
- Throws:
IOException
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ReadChar
- Throws:
IOException
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BeginToken
Description copied from interface:CharStream
Returns the next character that marks the beginning of the next token. All characters must remain in the buffer between two successive calls to this method to implement backup correctly.- Specified by:
BeginToken
in interfaceCharStream
- Throws:
IOException
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UpdateLineColumn
private void UpdateLineColumn(char c) -
readChar
Description copied from interface:CharStream
Returns the next character from the selected input. The method of selecting the input is the responsibility of the class implementing this interface. Can throw any java.io.IOException.- Specified by:
readChar
in interfaceCharStream
- Throws:
IOException
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getColumn
Deprecated.Description copied from interface:CharStream
Returns the column position of the character last read.- Specified by:
getColumn
in interfaceCharStream
- See Also:
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getLine
Deprecated.Description copied from interface:CharStream
Returns the line number of the character last read.- Specified by:
getLine
in interfaceCharStream
- See Also:
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getEndColumn
public final int getEndColumn()Description copied from interface:CharStream
Returns the column number of the last character for current token (being matched after the last call to BeginTOken).- Specified by:
getEndColumn
in interfaceCharStream
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getEndLine
public final int getEndLine()Description copied from interface:CharStream
Returns the line number of the last character for current token (being matched after the last call to BeginTOken).- Specified by:
getEndLine
in interfaceCharStream
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getBeginColumn
public final int getBeginColumn()Description copied from interface:CharStream
Returns the column number of the first character for current token (being matched after the last call to BeginTOken).- Specified by:
getBeginColumn
in interfaceCharStream
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getBeginLine
public final int getBeginLine()Description copied from interface:CharStream
Returns the line number of the first character for current token (being matched after the last call to BeginTOken).- Specified by:
getBeginLine
in interfaceCharStream
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getBeginOffset
public final int getBeginOffset()- Specified by:
getBeginOffset
in interfaceCharStream
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getEndOffset
public final int getEndOffset()- Specified by:
getEndOffset
in interfaceCharStream
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backup
public final void backup(int amount) Description copied from interface:CharStream
Backs up the input stream by amount steps. Lexer calls this method if it had already read some characters, but could not use them to match a (longer) token. So, they will be used again as the prefix of the next token and it is the implemetation's responsibility to do this right.- Specified by:
backup
in interfaceCharStream
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ReInit
- Specified by:
ReInit
in interfaceCharStream
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ReInit
- Specified by:
ReInit
in interfaceCharStream
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ReInit
- Specified by:
ReInit
in interfaceCharStream
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ReInit
- Specified by:
ReInit
in interfaceCharStream
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GetImage
Description copied from interface:CharStream
Returns a string made up of characters from the marked token beginning to the current buffer position. Implementations have the choice of returning anything that they want to. For example, for efficiency, one might decide to just return null, which is a valid implementation.- Specified by:
GetImage
in interfaceCharStream
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GetSuffix
public final char[] GetSuffix(int len) Description copied from interface:CharStream
Returns an array of characters that make up the suffix of length 'len' for the currently matched token. This is used to build up the matched string for use in actions in the case of MORE. A simple and inefficient implementation of this is as follows : { String t = GetImage(); return t.substring(t.length() - len, t.length()).toCharArray(); }- Specified by:
GetSuffix
in interfaceCharStream
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Done
public void Done()Description copied from interface:CharStream
The lexer calls this function to indicate that it is done with the stream and hence implementations can free any resources held by this class. Again, the body of this function can be just empty and it will not affect the lexer's operation.- Specified by:
Done
in interfaceCharStream
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adjustBeginLineColumn
public void adjustBeginLineColumn(int newLine, int newCol) Method to adjust line and column numbers for the start of a token.
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