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101 lines
3.6 KiB
Java
101 lines
3.6 KiB
Java
/*
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[The "BSD licence"]
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Copyright (c) 2005-2008 Terence Parr
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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3. The name of the author may not be used to endorse or promote products
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derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package org.antlr.tool;
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import antlr.Token;
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public class RuleLabelScope extends AttributeScope {
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/** Rules have a predefined set of attributes as well as
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* the return values. 'text' needs to be computed though so.
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*/
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public static AttributeScope predefinedRulePropertiesScope =
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new AttributeScope("RulePredefined",null) {{
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addAttribute("text", null);
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addAttribute("start", null);
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addAttribute("stop", null);
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addAttribute("tree", null);
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addAttribute("st", null);
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isPredefinedRuleScope = true;
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}};
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public static AttributeScope predefinedTreeRulePropertiesScope =
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new AttributeScope("RulePredefined",null) {{
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addAttribute("text", null);
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addAttribute("start", null); // note: no stop; not meaningful
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addAttribute("tree", null);
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addAttribute("st", null);
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isPredefinedRuleScope = true;
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}};
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public static AttributeScope predefinedLexerRulePropertiesScope =
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new AttributeScope("LexerRulePredefined",null) {{
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addAttribute("text", null);
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addAttribute("type", null);
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addAttribute("line", null);
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addAttribute("index", null);
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addAttribute("pos", null);
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addAttribute("channel", null);
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addAttribute("start", null);
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addAttribute("stop", null);
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addAttribute("int", null);
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isPredefinedLexerRuleScope = true;
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}};
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public static AttributeScope[] grammarTypeToRulePropertiesScope =
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{
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null,
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predefinedLexerRulePropertiesScope, // LEXER
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predefinedRulePropertiesScope, // PARSER
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predefinedTreeRulePropertiesScope, // TREE_PARSER
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predefinedRulePropertiesScope, // COMBINED
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};
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public Rule referencedRule;
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public RuleLabelScope(Rule referencedRule, Token actionToken) {
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super("ref_"+referencedRule.name,actionToken);
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this.referencedRule = referencedRule;
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}
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/** If you label a rule reference, you can access that rule's
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* return values as well as any predefined attributes.
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*/
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public Attribute getAttribute(String name) {
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AttributeScope rulePropertiesScope =
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RuleLabelScope.grammarTypeToRulePropertiesScope[grammar.type];
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if ( rulePropertiesScope.getAttribute(name)!=null ) {
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return rulePropertiesScope.getAttribute(name);
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}
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if ( referencedRule.returnScope!=null ) {
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return referencedRule.returnScope.getAttribute(name);
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}
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return null;
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}
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}
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