Package io.github.treesitter.jtreesitter

Class Node

java.lang.Object

io.github.treesitter.jtreesitter.Node

@NullMarked
public final class Node
extends Object

A single node within a syntax tree.

Implementation Note:

Node lifetimes are tied to the Tree, TreeCursor, or Query that they belong to.

Method Summary

Modifier and Type	Method	Description
void	edit(InputEdit edit)	Edit this node to keep it in-sync with source code that has been edited.
boolean	equals(Object o)	Check if two nodes are identical.
Optional<Node>	getChild(int index)	Get the node's child at the given index, if any.
Optional<Node>	getChildByFieldId(short id)	Get the node's first child with the given field ID, if any.
Optional<Node>	getChildByFieldName(String name)	Get the node's first child with the given field name, if any.
Optional<Node>	getChildContainingDescendant(Node descendant)	Get the child of the node that contains the given descendant, if any.
int	getChildCount()	Get the number of this node's children.
List<Node>	getChildren()	Get this node's children.
List<Node>	getChildrenByFieldId(short id)	Get a list of the node's children with the given field ID.
List<Node>	getChildrenByFieldName(String name)	Get a list of the node's child with the given field name.
Optional<Node>	getDescendant(int start, int end)	Get the smallest node within this node that spans the given byte range, if any.
Optional<Node>	getDescendant(Point start, Point end)	Get the smallest node within this node that spans the given point range, if any.
int	getDescendantCount()	Get the number of this node's descendants, including the node itself.
int	getEndByte()	Get the end byte of the node.
Point	getEndPoint()	Get the end point of the node.
@Nullable String	getFieldNameForChild(int index)	Get the field name of this node’s child at the given index, if available.
short	getGrammarSymbol()	Get the numerical ID of the node's type, as it appears in the grammar ignoring aliases.
String	getGrammarType()	Get the type of the node, as it appears in the grammar ignoring aliases.
long	getId()	Get the numerical ID of the node.
Optional<Node>	getNamedChild(int index)	Get the node's named child at the given index, if any.
int	getNamedChildCount()	Get the number of this node's named children.
List<Node>	getNamedChildren()	Get this node's named children.
Optional<Node>	getNamedDescendant(int start, int end)	Get the smallest named node within this node that spans the given byte range, if any.
Optional<Node>	getNamedDescendant(Point start, Point end)	Get the smallest named node within this node that spans the given point range, if any.
Optional<Node>	getNextNamedSibling()	The node's next named sibling, if any.
short	getNextParseState()	Get the parse state after this node.
Optional<Node>	getNextSibling()	The node's next sibling, if any.
Optional<Node>	getParent()	The node's immediate parent, if any.
short	getParseState()	Get the parse state of this node.
Optional<Node>	getPrevNamedSibling()	The node's previous named sibling, if any.
Optional<Node>	getPrevSibling()	The node's previous sibling, if any.
Range	getRange()	Get the range of the node.
int	getStartByte()	Get the start byte of the node.
Point	getStartPoint()	Get the start point of the node.
short	getSymbol()	Get the numerical ID of the node's type.
@Nullable String	getText()	Get the source code of the node, if available.
Tree	getTree()	Get the tree that contains this node.
String	getType()	Get the type of the node.
boolean	hasChanges()	Check if the node has been edited.
boolean	hasError()	Check if the node is an ERROR, or contains any ERROR nodes.
int	hashCode()
boolean	isError()	Check if the node is an ERROR node.
boolean	isExtra()	Check if the node is extra.
boolean	isMissing()	Check if the node is MISSING.
boolean	isNamed()	Check if the node is named.
String	toSexp()	Get the S-expression representing the node.
String	toString()
TreeCursor	walk()	Create a new tree cursor starting from this node.

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Method Details

getTree

public Tree getTree()

Get the tree that contains this node.

getId

@Unsigned
public long getId()

Get the numerical ID of the node.

API Note:

Within any given syntax tree, no two nodes have the same ID. However, if a new tree is created based on an older tree, and a node from the old tree is reused in the process, then that node will have the same ID in both trees.

getSymbol

@Unsigned
public short getSymbol()

Get the numerical ID of the node's type.

getGrammarSymbol

@Unsigned
public short getGrammarSymbol()

Get the numerical ID of the node's type, as it appears in the grammar ignoring aliases.

getType

public String getType()

Get the type of the node.

getGrammarType

public String getGrammarType()

Get the type of the node, as it appears in the grammar ignoring aliases.

isNamed

public boolean isNamed()

Check if the node is named.

Named nodes correspond to named rules in the grammar, whereas anonymous nodes correspond to string literals.

isExtra

public boolean isExtra()

Check if the node is extra.

Extra nodes represent things which are not required by the grammar but can appear anywhere (e.g. whitespace).

isError

public boolean isError()

Check if the node is an ERROR node.

isMissing

public boolean isMissing()

Check if the node is MISSING.

MISSING nodes are inserted by the parser in order to recover from certain kinds of syntax errors.

hasChanges

public boolean hasChanges()

Check if the node has been edited.

hasError

public boolean hasError()

Check if the node is an ERROR, or contains any ERROR nodes.

getParseState

@Unsigned
public short getParseState()

Get the parse state of this node.

getNextParseState

@Unsigned
public short getNextParseState()

Get the parse state after this node.

getStartByte

@Unsigned
public int getStartByte()

Get the start byte of the node.

getEndByte

@Unsigned
public int getEndByte()

Get the end byte of the node.

getRange

public Range getRange()

Get the range of the node.

getStartPoint

public Point getStartPoint()

Get the start point of the node.

getEndPoint

public Point getEndPoint()

Get the end point of the node.

getChildCount

@Unsigned
public int getChildCount()

Get the number of this node's children.

getNamedChildCount

@Unsigned
public int getNamedChildCount()

Get the number of this node's named children.

getDescendantCount

@Unsigned
public int getDescendantCount()

Get the number of this node's descendants, including the node itself.

getParent

public Optional<Node> getParent()

The node's immediate parent, if any.

getNextSibling

public Optional<Node> getNextSibling()

The node's next sibling, if any.

getPrevSibling

public Optional<Node> getPrevSibling()

The node's previous sibling, if any.

getNextNamedSibling

public Optional<Node> getNextNamedSibling()

The node's next named sibling, if any.

getPrevNamedSibling

public Optional<Node> getPrevNamedSibling()

The node's previous named sibling, if any.

getChild

public Optional<Node> getChild(@Unsigned
 int index)
                        throws IndexOutOfBoundsException

Get the node's child at the given index, if any.

Throws:

IndexOutOfBoundsException - If the index exceeds the child count.

API Note:

This method is fairly fast, but its cost is technically log(i), so if you might be iterating over a long list of children, you should use getChildren() or walk() instead.

getNamedChild

public Optional<Node> getNamedChild(@Unsigned
 int index)
                             throws IndexOutOfBoundsException

Get the node's named child at the given index, if any.

Throws:

IndexOutOfBoundsException - If the index exceeds the child count.

API Note:

This method is fairly fast, but its cost is technically log(i), so if you might be iterating over a long list of children, you should use getNamedChildren() or walk() instead.

getChildByFieldId

public Optional<Node> getChildByFieldId(@Unsigned
 short id)

Get the node's first child with the given field ID, if any.

See Also:

• Language.getFieldIdForName(java.lang.String)

getChildByFieldName

public Optional<Node> getChildByFieldName(String name)

Get the node's first child with the given field name, if any.

getChildren

public List<Node> getChildren()

Get this node's children.

API Note:

If you're walking the tree recursively, you may want to use walk() instead.

getNamedChildren

public List<Node> getNamedChildren()

Get this node's named children.

getChildrenByFieldId

public List<Node> getChildrenByFieldId(@Unsigned
 short id)

Get a list of the node's children with the given field ID.

See Also:

• Language.getFieldIdForName(java.lang.String)

getChildrenByFieldName

public List<Node> getChildrenByFieldName(String name)

Get a list of the node's child with the given field name.

getFieldNameForChild

public @Nullable String getFieldNameForChild(@Unsigned
 int index)
                                      throws IndexOutOfBoundsException

Get the field name of this node’s child at the given index, if available.

Throws:

IndexOutOfBoundsException - If the index exceeds the child count.

getDescendant

public Optional<Node> getDescendant(@Unsigned
 int start,
 @Unsigned
 int end)
                             throws IllegalArgumentException

Get the smallest node within this node that spans the given byte range, if any.

Throws:

IllegalArgumentException - If start > end.

getDescendant

public Optional<Node> getDescendant(Point start,
 Point end)
                             throws IllegalArgumentException

Get the smallest node within this node that spans the given point range, if any.

Throws:

IllegalArgumentException - If start > end.

getNamedDescendant

public Optional<Node> getNamedDescendant(@Unsigned
 int start,
 @Unsigned
 int end)
                                  throws IllegalArgumentException

Get the smallest named node within this node that spans the given byte range, if any.

Throws:

IllegalArgumentException - If start > end.

getNamedDescendant

public Optional<Node> getNamedDescendant(Point start,
 Point end)

Get the smallest named node within this node that spans the given point range, if any.

Throws:

IllegalArgumentException - If start > end.

getChildContainingDescendant

public Optional<Node> getChildContainingDescendant(Node descendant)

Get the child of the node that contains the given descendant, if any.

getText

public @Nullable String getText()

Get the source code of the node, if available.

edit

public void edit(InputEdit edit)

Edit this node to keep it in-sync with source code that has been edited.

API Note:

This method is only rarely needed. When you edit a syntax tree via Tree.edit(io.github.treesitter.jtreesitter.InputEdit), all of the nodes that you retrieve from the tree afterward will already reflect the edit. You only need to use this when you have a specific Node instance that you want to keep and continue to use after an edit.

walk

public TreeCursor walk()

Create a new tree cursor starting from this node.

toSexp

public String toSexp()

Get the S-expression representing the node.

equals

public boolean equals(Object o)

Check if two nodes are identical.

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object