| /* |
| * [The "BSD license"] |
| * Copyright (c) 2010 Terence Parr |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| package org.antlr.tool; |
| |
| import org.antlr.runtime.Token; |
| |
| public class RuleLabelScope extends AttributeScope { |
| /** Rules have a predefined set of attributes as well as |
| * the return values. 'text' needs to be computed though so. |
| */ |
| public static AttributeScope predefinedRulePropertiesScope = |
| new AttributeScope("RulePredefined",null) {{ |
| addAttribute("text", null); |
| addAttribute("start", null); |
| addAttribute("stop", null); |
| addAttribute("tree", null); |
| addAttribute("st", null); |
| isPredefinedRuleScope = true; |
| }}; |
| |
| public static AttributeScope predefinedTreeRulePropertiesScope = |
| new AttributeScope("RulePredefined",null) {{ |
| addAttribute("text", null); |
| addAttribute("start", null); // note: no stop; not meaningful |
| addAttribute("tree", null); |
| addAttribute("st", null); |
| isPredefinedRuleScope = true; |
| }}; |
| |
| public static AttributeScope predefinedLexerRulePropertiesScope = |
| new AttributeScope("LexerRulePredefined",null) {{ |
| addAttribute("text", null); |
| addAttribute("type", null); |
| addAttribute("line", null); |
| addAttribute("index", null); |
| addAttribute("pos", null); |
| addAttribute("channel", null); |
| addAttribute("start", null); |
| addAttribute("stop", null); |
| addAttribute("int", null); |
| isPredefinedLexerRuleScope = true; |
| }}; |
| |
| public static AttributeScope[] grammarTypeToRulePropertiesScope = |
| { |
| null, |
| predefinedLexerRulePropertiesScope, // LEXER |
| predefinedRulePropertiesScope, // PARSER |
| predefinedTreeRulePropertiesScope, // TREE_PARSER |
| predefinedRulePropertiesScope, // COMBINED |
| }; |
| |
| public Rule referencedRule; |
| |
| public RuleLabelScope(Rule referencedRule, Token actionToken) { |
| super("ref_"+referencedRule.name,actionToken); |
| this.referencedRule = referencedRule; |
| } |
| |
| /** If you label a rule reference, you can access that rule's |
| * return values as well as any predefined attributes. |
| */ |
| @Override |
| public Attribute getAttribute(String name) { |
| AttributeScope rulePropertiesScope = |
| RuleLabelScope.grammarTypeToRulePropertiesScope[grammar.type]; |
| if ( rulePropertiesScope.getAttribute(name)!=null ) { |
| return rulePropertiesScope.getAttribute(name); |
| } |
| |
| if ( referencedRule.returnScope!=null ) { |
| return referencedRule.returnScope.getAttribute(name); |
| } |
| return null; |
| } |
| } |