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Java Source Code / Java Documentation » IDE » DrJava » edu.rice.cs.drjava.model.definitions.reducedmodel

Source Cross Reference

Class Diagram

Java Document (Java Doc)

java.lang .Object

edu.rice.cs.drjava.model.definitions.reducedmodel .ReducedModelControl

ReducedModelControl
public class ReducedModelControl implements BraceReduction(Code)
	This class provides an implementation of the BraceReduction interface for brace matching. In order to correctly match, this class keeps track of what is commented (line and block) and what is inside double quotes and keeps this in mind when matching. To avoid unnecessary complication, this class maintains a few invariants for its consistent states, i.e., between top-level function calls. The cursor offset is never at the end of a brace. If movement or insertion puts it there, the cursor is updated to point to the 0 offset of the next brace. Quoting information is invalid inside valid comments. When part of the document becomes uncommented, the reduced model must update the quoting information linearly in the newly revealed code. Quote shadowing and comment shadowing are mutually exclusive. There is no nesting of comment open characters. If // is encountered in the middle of a comment, it is treated as two separate slashes. Similar for /. All of the code in the class assumes that a lock on this is held. author:* JavaPLT version: $Id: ReducedModelControl.java 4255 2007-08-28 19:17:37Z mgricken $

Field Summary
volatile int	_offset
volatile ReducedModelBrace	_rmb
volatile ReducedModelComment	_rmc

Method Summary
public int	absOffset() Gets the absolute character offset into the document represented by the reduced model.
boolean	atEnd() Determines if the cursor is at the end of the reduced model.
boolean	atStart() Determines if the cursor is at the start of the reduced model.
public int	balanceBackward() Finds the open brace that matches the previous significant brace iff that brace is an closing brace. the distance until the matching open brace.
public int	balanceForward() Finds the closing brace that matches the next significant brace iff that brace is an open brace. the distance until the matching closing brace.
public ReducedToken	currentToken() Get the token currently pointed at by the cursor.
public void	delete(int count) Update the BraceReduction to reflect text deletion. Parameters: count - indicates the size and direction of text deletion.
int	getBlockOffset() Gets the offset within the current token.
public int	getDistToNextNewline()
public int	getDistToPreviousNewline(int relLoc) Gets distance to end of line on the line previous.
public Vector<HighlightStatus>	getHighlightStatus(int start, int length) Return all highlight status info for text between the current location and current location + length.
public IndentInfo	getIndentInformation()
int	getSize() Gets the size of the current token. It checks both the brace and comment sub-models to find the size of the current token.
int	getSize(ReducedToken rmbToken, ReducedToken rmcToken)
public ReducedModelState	getStateAtCurrent() Get the shadowing state at the current caret position.
String	getType() Get a string representation of the current token's type.
public void	insertChar(char ch)
public void	move(int count) Updates the BraceReduction to reflect cursor movement.
public ReducedModelState	moveWalkerGetState(int relDistance) This function returns the state at the relDistance, where relDistance is relative to the last time it was called.
void	next() Move the reduced model to the next token and update the cursor information.
public ReducedToken	nextItem() Get the next token.
void	prev() Move the reduced model to the previous token and update the cursor information.
public ReducedToken	prevItem() Get the previous token.
public void	resetLocation() This function resets the location of the walker in the comment list to where the current cursor is.
public String	simpleString() A toString() substitute.

Field Detail

_offset
volatile int _offset(Code)

_rmb
volatile ReducedModelBrace _rmb(Code)

_rmc
volatile ReducedModelComment _rmc(Code)

Method Detail

absOffset
public int absOffset()(Code)
	Gets the absolute character offset into the document represented by the reduced model.

atEnd
boolean atEnd()(Code)
	Determines if the cursor is at the end of the reduced model.

atStart
boolean atStart()(Code)
	Determines if the cursor is at the start of the reduced model.

balanceBackward
public int balanceBackward()(Code)
	Finds the open brace that matches the previous significant brace iff that brace is an closing brace. the distance until the matching open brace. On failure, returns -1. See Also: ReducedModelControl.balanceForward()

balanceForward
public int balanceForward()(Code)
	Finds the closing brace that matches the next significant brace iff that brace is an open brace. the distance until the matching closing brace. On failure, returns -1. See Also: ReducedModelControl.balanceBackward()

currentToken
public ReducedToken currentToken()(Code)
	Get the token currently pointed at by the cursor. Because the reduced model is split into two reduced sub-models, we have to check each sub-model first as each one has unique information. If we find a non-gap token in either sub-model we want to return that. Otherwise, we want to return a sort of hybrid Gap of the two, i.e., a Gap where there are neither special comment/quote tokens nor parens/squigglies/brackets. a ReducedToken representative of the unified reduced model

delete
public void delete(int count)(Code)
	Update the BraceReduction to reflect text deletion. Parameters: count - indicates the size and direction of text deletion. Negative values delete text to the left of thecursor, positive values delete text to the right.

getBlockOffset
int getBlockOffset()(Code)
	Gets the offset within the current token.

getDistToNextNewline
public int getDistToNextNewline()(Code)

getDistToPreviousNewline
public int getDistToPreviousNewline(int relLoc)(Code)
	Gets distance to end of line on the line previous.

getHighlightStatus
public Vector<HighlightStatus> getHighlightStatus(int start, int length)(Code)
	Return all highlight status info for text between the current location and current location + length. This should collapse adjoining blocks with the same status into one. Parameters: start - The start location of the area for which we want the status. The reduced model is already at thisposition, but this value is needed to determine the absolute positions in HighlightStatus objects we return. Parameters: length - The length of the text segment for which status information must be generated.

getIndentInformation
public IndentInfo getIndentInformation()(Code)
	Returns an IndentInfo containing the following information: - distance to the previous newline ( start of this line) - distance to the brace enclosing the beginning of the current line - distance to the beginning of the line containing that brace

getSize
int getSize()(Code)
	Gets the size of the current token. It checks both the brace and comment sub-models to find the size of the current token. If the current token is a Gap, we have to reconcile the information of both sub-models in order to get the correct size of the current token as seen by the outside world. the number of characters represented by the current token

getSize
int getSize(ReducedToken rmbToken, ReducedToken rmcToken)(Code)

getStateAtCurrent
public ReducedModelState getStateAtCurrent()(Code)
	Get the shadowing state at the current caret position. FREE\|INSIDE_LINE_COMMENT\|INSIDE_BLOCK_COMMENT\|INSIDE_SINGLE_QUOTE\|INSIDE_DOUBLE_QUOTE

getType
String getType()(Code)
	Get a string representation of the current token's type. "" if current is a Gap, otherwise, use ReducedToken.getType()

insertChar
public void insertChar(char ch)(Code)

move
public void move(int count)(Code)
	Updates the BraceReduction to reflect cursor movement. Negative values move left from the cursor, positive values move right. Parameters: count - indicates the direction and magnitude of cursor movement

moveWalkerGetState
public ReducedModelState moveWalkerGetState(int relDistance)(Code)
	This function returns the state at the relDistance, where relDistance is relative to the last time it was called. You can reset the last call to the current offset using resetLocation.

next
void next()(Code)
	Move the reduced model to the next token and update the cursor information.

nextItem
public ReducedToken nextItem()(Code)
	Get the next token.

prev
void prev()(Code)
	Move the reduced model to the previous token and update the cursor information.

prevItem
public ReducedToken prevItem()(Code)
	Get the previous token.

resetLocation
public void resetLocation()(Code)
	This function resets the location of the walker in the comment list to where the current cursor is. This allows the walker to keep walking and using relative distance instead of having to rewalk the same distance every call to stateAtRelLocation. It is an optimization.

simpleString
public String simpleString()(Code)
	A toString() substitute.

Methods inherited from java.lang.Object

native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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