Interface SyntaxTree

All Superinterfaces:

Tree

All Known Subinterfaces:

ErrorNode, ParseTree, RuleNode, TerminalNode

All Known Implementing Classes:

ErrorNodeImpl, GrammarInterpreterRuleContext, InterpreterRuleContext, ParserRuleContext, RuleContext, RuleContextWithAltNum, TerminalNodeImpl

public interface SyntaxTree
extends Tree

A tree that knows about an interval in a token stream is some kind of syntax tree. Subinterfaces distinguish between parse trees and other kinds of syntax trees we might want to create.

Method Summary

Modifier and Type	Method	Description
Interval	getSourceInterval()	Return an Interval indicating the index in the TokenStream of the first and last token associated with this subtree.

Methods inherited from interface Tree

getChild, getChildCount, getParent, getPayload, toStringTree

Method Details

getSourceInterval

Interval getSourceInterval()

Return an Interval indicating the index in the TokenStream of the first and last token associated with this subtree. If this node is a leaf, then the interval represents a single token and has interval i..i for token index i.

An interval of i..i-1 indicates an empty interval at position i in the input stream, where 0 <= i <= the size of the input token stream. Currently, the code base can only have i=0..n-1 but in concept one could have an empty interval after EOF.

If source interval is unknown, this returns Interval.INVALID.

As a weird special case, the source interval for rules matched after EOF is unspecified.