1 files changed, 100 insertions, 0 deletions
diff --git a/antlr-3.4/tool/src/main/java/org/antlr/tool/RuleLabelScope.java b/antlr-3.4/tool/src/main/java/org/antlr/tool/RuleLabelScope.java
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+++ b/antlr-3.4/tool/src/main/java/org/antlr/tool/RuleLabelScope.java
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+/*
+ * [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.
+	 */
+	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;
+	}
+}