org.antlr.runtime.tree

Class CommonTreeNodeStream

java.lang.Object

org.antlr.runtime.misc.FastQueue<T>

org.antlr.runtime.misc.LookaheadStream<Object>

org.antlr.runtime.tree.CommonTreeNodeStream

All Implemented Interfaces:

IntStream, TreeNodeStream

public class CommonTreeNodeStream
extends LookaheadStream<Object>
implements TreeNodeStream

Field Summary

Fields

Modifier and Type	Field and Description
protected IntArray	calls Stack of indexes used for push/pop calls
static int	DEFAULT_INITIAL_BUFFER_SIZE
protected boolean	hasNilRoot Tree (nil A B C) trees like flat A B C streams
static int	INITIAL_CALL_STACK_SIZE
protected TreeIterator	it The tree iterator we using
protected int	level Tracks tree depth.
protected Object	root Pull nodes from which tree?
protected TokenStream	tokens If this tree (root) was created from a token stream, track it.

Fields inherited from class org.antlr.runtime.misc.LookaheadStream

eof, eofElementIndex, lastMarker, markDepth, UNINITIALIZED_EOF_ELEMENT_INDEX

Fields inherited from class org.antlr.runtime.misc.FastQueue

data, p

Constructor Summary

Constructors

Constructor and Description
CommonTreeNodeStream(Object tree)
CommonTreeNodeStream(TreeAdaptor adaptor, Object tree)

Method Summary

Methods

Modifier and Type	Method and Description
String	getSourceName() Where are you getting symbols from? Normally, implementations will pass the buck all the way to the lexer who can ask its input stream for the file name or whatever.
TokenStream	getTokenStream() If the tree associated with this stream was created from a TokenStream, you can specify it here.
TreeAdaptor	getTreeAdaptor() What adaptor can tell me how to interpret/navigate nodes and trees.
Object	getTreeSource() Where is this stream pulling nodes from? This is not the name, but the object that provides node objects.
int	LA(int i) Get int at current input pointer + i ahead where i=1 is next int.
Object	nextElement() Pull elements from tree iterator.
int	pop() Seek back to previous index saved during last push() call.
void	push(int index) Make stream jump to a new location, saving old location.
void	replaceChildren(Object parent, int startChildIndex, int stopChildIndex, Object t) Replace from start to stop child index of parent with t, which might be a list.
void	reset() Reset the tree node stream in such a way that it acts like a freshly constructed stream.
void	setTokenStream(TokenStream tokens)
void	setTreeAdaptor(TreeAdaptor adaptor)
void	setUniqueNavigationNodes(boolean uniqueNavigationNodes) As we flatten the tree, we use UP, DOWN nodes to represent the tree structure.
String	toString(Object start, Object stop) Return the text of all nodes from start to stop, inclusive.
String	toTokenTypeString() For debugging; destructive: moves tree iterator to end.

Methods inherited from class org.antlr.runtime.misc.LookaheadStream

consume, fill, getCurrentSymbol, index, LB, LT, mark, release, remove, rewind, rewind, seek, size, sync

Methods inherited from class org.antlr.runtime.misc.FastQueue

add, clear, get, head, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.antlr.runtime.tree.TreeNodeStream

get, LT

Methods inherited from interface org.antlr.runtime.IntStream

consume, index, mark, release, rewind, rewind, seek, size

Field Detail

DEFAULT_INITIAL_BUFFER_SIZE

public static final int DEFAULT_INITIAL_BUFFER_SIZE

See Also:

Constant Field Values

INITIAL_CALL_STACK_SIZE

public static final int INITIAL_CALL_STACK_SIZE

See Also:

Constant Field Values

root

protected Object root

Pull nodes from which tree?

tokens

protected TokenStream tokens

If this tree (root) was created from a token stream, track it.

it

protected TreeIterator it

The tree iterator we using

calls

protected IntArray calls

Stack of indexes used for push/pop calls

hasNilRoot

protected boolean hasNilRoot

Tree (nil A B C) trees like flat A B C streams

level

protected int level

Tracks tree depth. Level=0 means we're at root node level.

Constructor Detail

CommonTreeNodeStream

public CommonTreeNodeStream(Object tree)

CommonTreeNodeStream

public CommonTreeNodeStream(TreeAdaptor adaptor,
                    Object tree)

Method Detail

reset

public void reset()

Description copied from interface: TreeNodeStream

Reset the tree node stream in such a way that it acts like a freshly constructed stream.

Specified by:

reset in interface TreeNodeStream

Overrides:

reset in class LookaheadStream<Object>

nextElement

public Object nextElement()

Pull elements from tree iterator. Track tree level 0..max_level. If nil rooted tree, don't give initial nil and DOWN nor final UP.

Specified by:

nextElement in class LookaheadStream<Object>

setUniqueNavigationNodes

public void setUniqueNavigationNodes(boolean uniqueNavigationNodes)

Description copied from interface: TreeNodeStream

As we flatten the tree, we use UP, DOWN nodes to represent the tree structure. When debugging we need unique nodes so we have to instantiate new ones. When doing normal tree parsing, it's slow and a waste of memory to create unique navigation nodes. Default should be false;

Specified by:

setUniqueNavigationNodes in interface TreeNodeStream

getTreeSource

public Object getTreeSource()

Description copied from interface: TreeNodeStream

Where is this stream pulling nodes from? This is not the name, but the object that provides node objects.

Specified by:

getTreeSource in interface TreeNodeStream

getSourceName

public String getSourceName()

Description copied from interface: IntStream

Where are you getting symbols from? Normally, implementations will pass the buck all the way to the lexer who can ask its input stream for the file name or whatever.

Specified by:

getSourceName in interface IntStream

getTokenStream

public TokenStream getTokenStream()

Description copied from interface: TreeNodeStream

If the tree associated with this stream was created from a TokenStream, you can specify it here. Used to do rule $text attribute in tree parser. Optional unless you use tree parser rule text attribute or output=template and rewrite=true options.

Specified by:

getTokenStream in interface TreeNodeStream

setTokenStream

public void setTokenStream(TokenStream tokens)

getTreeAdaptor

public TreeAdaptor getTreeAdaptor()

Description copied from interface: TreeNodeStream

What adaptor can tell me how to interpret/navigate nodes and trees. E.g., get text of a node.

Specified by:

getTreeAdaptor in interface TreeNodeStream

setTreeAdaptor

public void setTreeAdaptor(TreeAdaptor adaptor)

LA

public int LA(int i)

Description copied from interface: IntStream

Get int at current input pointer + i ahead where i=1 is next int. Negative indexes are allowed. LA(-1) is previous token (token just matched). LA(-i) where i is before first token should yield -1, invalid char / EOF.

Specified by:

LA in interface IntStream

push

public void push(int index)

Make stream jump to a new location, saving old location. Switch back with pop().

pop

public int pop()

Seek back to previous index saved during last push() call. Return top of stack (return index).

replaceChildren

public void replaceChildren(Object parent,
                   int startChildIndex,
                   int stopChildIndex,
                   Object t)

Description copied from interface: TreeNodeStream

Replace from start to stop child index of parent with t, which might be a list. Number of children may be different after this call. The stream is notified because it is walking the tree and might need to know you are monkeying with the underlying tree. Also, it might be able to modify the node stream to avoid restreaming for future phases. If parent is null, don't do anything; must be at root of overall tree. Can't replace whatever points to the parent externally. Do nothing.

Specified by:

replaceChildren in interface TreeNodeStream

toString

public String toString(Object start,
              Object stop)

Description copied from interface: TreeNodeStream

Return the text of all nodes from start to stop, inclusive. If the stream does not buffer all the nodes then it can still walk recursively from start until stop. You can always return null or "" too, but users should not access $ruleLabel.text in an action of course in that case.

Specified by:

toString in interface TreeNodeStream

toTokenTypeString

public String toTokenTypeString()

For debugging; destructive: moves tree iterator to end.