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The ANTLR 4 grammar compiler.
/*
* Copyright (c) 2012 The ANTLR Project. All rights reserved.
* Use of this file is governed by the BSD-3-Clause license that
* can be found in the LICENSE.txt file in the project root.
*/
package org.antlr.v4.tool;
import org.antlr.v4.tool.ast.ActionAST;
/** Grammars, rules, and alternatives all have symbols visible to
* actions. To evaluate attr exprs, ask action for its resolver
* then ask resolver to look up various symbols. Depending on the context,
* some symbols are available at some aren't.
*
* Alternative level:
*
* $x Attribute: rule arguments, return values, predefined rule prop.
* AttributeDict: references to tokens and token labels in the
* current alt (including any elements within subrules contained
* in that outermost alt). x can be rule with scope or a global scope.
* List label: x is a token/rule list label.
* $x.y Attribute: x is surrounding rule, rule/token/label ref
* $s::y Attribute: s is any rule with scope or global scope; y is prop within
*
* Rule level:
*
* $x Attribute: rule arguments, return values, predefined rule prop.
* AttributeDict: references to token labels in *any* alt. x can
* be any rule with scope or global scope.
* List label: x is a token/rule list label.
* $x.y Attribute: x is surrounding rule, label ref (in any alts)
* $s::y Attribute: s is any rule with scope or global scope; y is prop within
*
* Grammar level:
*
* $s AttributeDict: s is a global scope
* $s::y Attribute: s is a global scope; y is prop within
*/
public interface AttributeResolver {
public boolean resolvesToListLabel(String x, ActionAST node);
public boolean resolvesToLabel(String x, ActionAST node);
public boolean resolvesToAttributeDict(String x, ActionAST node);
public boolean resolvesToToken(String x, ActionAST node);
public Attribute resolveToAttribute(String x, ActionAST node);
public Attribute resolveToAttribute(String x, String y, ActionAST node);
}