org.fife.ui.rsyntaxtextarea.modes

Class PerlTokenMaker

java.lang.Object

org.fife.ui.rsyntaxtextarea.TokenMakerBase

org.fife.ui.rsyntaxtextarea.AbstractJFlexTokenMaker

org.fife.ui.rsyntaxtextarea.AbstractJFlexCTokenMaker

org.fife.ui.rsyntaxtextarea.modes.PerlTokenMaker

All Implemented Interfaces:

TokenMaker

public class PerlTokenMaker
extends AbstractJFlexCTokenMaker

Scanner for Perl.

This implementation was created using JFlex 1.4.1; however, the generated file was modified for performance. Memory allocation needs to be almost completely removed to be competitive with the handwritten lexers (subclasses of AbstractTokenMaker, so this class has been modified so that Strings are never allocated (via yytext()), and the scanner never has to worry about refilling its buffer (needlessly copying chars around). We can achieve this because RText always scans exactly 1 line of tokens at a time, and hands the scanner this line as an array of characters (a Segment really). Since tokens contain pointers to char arrays instead of Strings holding their contents, there is no need for allocating new memory for Strings.

The actual algorithm generated for scanning has, of course, not been modified.

If you wish to regenerate this file yourself, keep in mind the following:

• The generated PerlTokenMaker.java file will contain two definitions of both zzRefill and yyreset. You should hand-delete the second of each definition (the ones generated by the lexer), as these generated methods modify the input buffer, which we'll never have to do.
• You should also change the declaration/definition of zzBuffer to NOT be initialized. This is a needless memory allocation for us since we will be pointing the array somewhere else anyway.
• You should NOT call yylex() on the generated scanner directly; rather, you should use getTokenList as you would with any other TokenMaker instance.

Nested Class Summary

Nested classes/interfaces inherited from class org.fife.ui.rsyntaxtextarea.AbstractJFlexCTokenMaker

AbstractJFlexCTokenMaker.CStyleInsertBreakAction

Field Summary

Fields

Modifier and Type	Field and Description
static int	BACKTICKS
static int	CHAR_LITERAL
static int	HEREDOC_EOF_SINGLE_QUOTED lexical states
static int	HEREDOC_EOF_UNQUOTED
static int	HEREDOC_EOT_SINGLE_QUOTED
static int	HEREDOC_EOT_UNQUOTED
static int	INTERNAL_HEREDOC_EOF_SINGLE_QUOTED Token type specific to PerlTokenMaker; this signals that we are inside an single quoted EOF heredoc.
static int	INTERNAL_HEREDOC_EOF_UNQUOTED Token type specific to PerlTokenMaker; this signals that we are inside an unquoted/double quoted/backtick EOF heredoc.
static int	INTERNAL_HEREDOC_EOT_SINGLE_QUOTED Token type specific to PerlTokenMaker; this signals that we are inside an single quoted EOT heredoc.
static int	INTERNAL_HEREDOC_EOT_UNQUOTED Token type specific to PerlTokenMaker; this signals that we are inside an unquoted/double quoted/backtick EOT heredoc.
static int	INTERNAL_POD Token type specific to PerlTokenMaker; this signals we are in a POD block.
static int	POD
static int	STRING
static int	YYEOF This character denotes the end of file
static int	YYINITIAL

Fields inherited from class org.fife.ui.rsyntaxtextarea.AbstractJFlexTokenMaker

offsetShift, s, start

Fields inherited from class org.fife.ui.rsyntaxtextarea.TokenMakerBase

currentToken, firstToken, previousToken

Constructor Summary

Constructors

Constructor and Description
PerlTokenMaker() Constructor.
PerlTokenMaker(java.io.InputStream in) Creates a new scanner.
PerlTokenMaker(java.io.Reader in) Creates a new scanner There is also a java.io.InputStream version of this constructor.

Method Summary

Modifier and Type	Method and Description
void	addToken(char[] array, int start, int end, int tokenType, int startOffset) Adds the token specified to the current linked list of tokens.
java.lang.String[]	getLineCommentStartAndEnd(int languageIndex) Returns the text to place at the beginning and end of a line to "comment" it in this programming language.
boolean	getMarkOccurrencesOfTokenType(int type) Returns whether tokens of the specified type should have "mark occurrences" enabled for the current programming language.
Token	getTokenList(javax.swing.text.Segment text, int initialTokenType, int startOffset) Returns the first token in the linked list of tokens generated from text.
void	yybegin(int newState) Enters a new lexical state
char	yycharat(int pos) Returns the character at position pos from the matched text.
void	yyclose() Closes the input stream.
int	yylength() Returns the length of the matched text region.
Token	yylex() Resumes 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) Resets the scanner to read from a new input stream.
int	yystate() Returns the current lexical state.
java.lang.String	yytext() Returns the text matched by the current regular expression.

Methods inherited from class org.fife.ui.rsyntaxtextarea.AbstractJFlexCTokenMaker

createInsertBreakAction, getCurlyBracesDenoteCodeBlocks, getInsertBreakAction, getShouldIndentNextLineAfter

Methods inherited from class org.fife.ui.rsyntaxtextarea.AbstractJFlexTokenMaker

yybegin

Methods inherited from class org.fife.ui.rsyntaxtextarea.TokenMakerBase

addNullToken, addToken, addToken, createOccurrenceMarker, getClosestStandardTokenTypeForInternalType, getLanguageIndex, getLastTokenTypeOnLine, getNoTokensIdentifiedYet, getOccurrenceMarker, isIdentifierChar, isMarkupLanguage, resetTokenList, setLanguageIndex

Methods inherited from class java.lang.Object

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

Field Detail

YYEOF

public static final int YYEOF

This character denotes the end of file

See Also:

Constant Field Values

HEREDOC_EOF_SINGLE_QUOTED

public static final int HEREDOC_EOF_SINGLE_QUOTED

lexical states

See Also:

Constant Field Values

HEREDOC_EOT_SINGLE_QUOTED

public static final int HEREDOC_EOT_SINGLE_QUOTED

See Also:

Constant Field Values

HEREDOC_EOT_UNQUOTED

public static final int HEREDOC_EOT_UNQUOTED

See Also:

Constant Field Values

STRING

public static final int STRING

See Also:

Constant Field Values

BACKTICKS

public static final int BACKTICKS

See Also:

Constant Field Values

YYINITIAL

public static final int YYINITIAL

See Also:

Constant Field Values

HEREDOC_EOF_UNQUOTED

public static final int HEREDOC_EOF_UNQUOTED

See Also:

Constant Field Values

CHAR_LITERAL

public static final int CHAR_LITERAL

See Also:

Constant Field Values

POD

public static final int POD

See Also:

Constant Field Values

INTERNAL_HEREDOC_EOF_UNQUOTED

public static final int INTERNAL_HEREDOC_EOF_UNQUOTED

Token type specific to PerlTokenMaker; this signals that we are inside an unquoted/double quoted/backtick EOF heredoc.

See Also:

Constant Field Values

INTERNAL_HEREDOC_EOF_SINGLE_QUOTED

public static final int INTERNAL_HEREDOC_EOF_SINGLE_QUOTED

Token type specific to PerlTokenMaker; this signals that we are inside an single quoted EOF heredoc.

See Also:

Constant Field Values

INTERNAL_HEREDOC_EOT_UNQUOTED

public static final int INTERNAL_HEREDOC_EOT_UNQUOTED

Token type specific to PerlTokenMaker; this signals that we are inside an unquoted/double quoted/backtick EOT heredoc.

See Also:

Constant Field Values

INTERNAL_HEREDOC_EOT_SINGLE_QUOTED

public static final int INTERNAL_HEREDOC_EOT_SINGLE_QUOTED

Token type specific to PerlTokenMaker; this signals that we are inside an single quoted EOT heredoc.

See Also:

Constant Field Values

INTERNAL_POD

public static final int INTERNAL_POD

Token type specific to PerlTokenMaker; this signals we are in a POD block.

See Also:

Constant Field Values

Constructor Detail

PerlTokenMaker

public PerlTokenMaker()

Constructor. This must be here because JFlex does not generate a no-parameter constructor.

PerlTokenMaker

public PerlTokenMaker(java.io.Reader in)

Creates a new scanner There is also a java.io.InputStream version of this constructor.

Parameters:

in - the java.io.Reader to read input from.

PerlTokenMaker

public PerlTokenMaker(java.io.InputStream in)

Creates a new scanner. There is also java.io.Reader version of this constructor.

Parameters:

in - the java.io.Inputstream to read input from.

Method Detail

addToken

public void addToken(char[] array,
                     int start,
                     int end,
                     int tokenType,
                     int startOffset)

Adds the token specified to the current linked list of tokens.

Specified by:

addToken in interface TokenMaker

Overrides:

addToken in class TokenMakerBase

Parameters:

array - The character array.

start - The starting offset in the array.

end - The ending offset in the array.

tokenType - The token's type.

startOffset - The offset in the document at which this token occurs.

getLineCommentStartAndEnd

public java.lang.String[] getLineCommentStartAndEnd(int languageIndex)

Returns the text to place at the beginning and end of a line to "comment" it in this programming language.

Specified by:

getLineCommentStartAndEnd in interface TokenMaker

Overrides:

getLineCommentStartAndEnd in class TokenMakerBase

Parameters:

languageIndex - The language index at the offset in question. Since some TokenMakers effectively have nested languages (such as JavaScript in HTML), this parameter tells the TokenMaker what sub-language to look at.

Returns:

The start and end strings to add to a line to "comment" it out. A null value for either means there is no string to add for that part. A value of null for the array means this language does not support commenting/uncommenting lines.

getMarkOccurrencesOfTokenType

public boolean getMarkOccurrencesOfTokenType(int type)

Returns whether tokens of the specified type should have "mark occurrences" enabled for the current programming language. The default implementation returns true if type is TokenTypes.IDENTIFIER. Subclasses can override this method to support other token types, such as TokenTypes.VARIABLE.

Specified by:

getMarkOccurrencesOfTokenType in interface TokenMaker

Overrides:

getMarkOccurrencesOfTokenType in class AbstractJFlexCTokenMaker

Parameters:

type - The token type.

Returns:

Whether tokens of this type should have "mark occurrences" enabled.

getTokenList

public Token getTokenList(javax.swing.text.Segment text,
                          int initialTokenType,
                          int startOffset)

Returns the first token in the linked list of tokens generated from text. This method must be implemented by subclasses so they can correctly implement syntax highlighting.

Parameters:

text - The text from which to get tokens.

initialTokenType - The token type we should start with.

startOffset - The offset into the document at which text starts.

Returns:

The first Token in a linked list representing the syntax highlighted text.

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 to YY_INITIAL.

Parameters:

reader - the new input stream

yyclose

public final void yyclose()
                   throws java.io.IOException

Closes the input stream.

Throws:

java.io.IOException

yystate

public final int yystate()

Returns the current lexical state.

yybegin

public final void yybegin(int newState)

Enters a new lexical state

Specified by:

yybegin in class AbstractJFlexTokenMaker

Parameters:

newState - the new lexical state

yytext

public final java.lang.String yytext()

Returns the text matched by the current regular expression.

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()

Returns the length of the matched text region.

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 Token yylex()
            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.

Returns:

the next token

Throws:

java.io.IOException - if any I/O-Error occurs