1 files changed, 134 insertions, 0 deletions
diff --git a/antlr-3.4/tool/src/main/java/org/antlr/tool/Attribute.java b/antlr-3.4/tool/src/main/java/org/antlr/tool/Attribute.java
new file mode 100644
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+++ b/antlr-3.4/tool/src/main/java/org/antlr/tool/Attribute.java
@@ -0,0 +1,134 @@
+/*
+ * [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;
+
+/** Track the names of attributes define in arg lists, return values,
+ *  scope blocks etc...
+ */
+public class Attribute {
+	/** The entire declaration such as "String foo;" */
+	public String decl;
+
+	/** The type; might be empty such as for Python which has no static typing */
+	public String type;
+
+	/** The name of the attribute "foo" */
+	public String name;
+
+	/** The optional attribute intialization expression */
+	public String initValue;
+
+	public Attribute(String decl) {
+		extractAttribute(decl);
+	}
+
+	public Attribute(String name, String decl) {
+		this.name = name;
+		this.decl = decl;
+	}
+
+	/** For decls like "String foo" or "char *foo32[3]" compute the ID
+	 *  and type declarations.  Also handle "int x=3" and 'T t = new T("foo")'
+	 *  but if the separator is ',' you cannot use ',' in the initvalue.
+	 *  AttributeScope.addAttributes takes care of the separation so we are
+	 *  free here to use from '=' to end of string as the expression.
+	 *
+	 *  Set name, type, initvalue, and full decl instance vars.
+	 */
+	protected void extractAttribute(String decl) {
+		if ( decl==null ) {
+			return;
+		}
+		boolean inID = false;
+		int start = -1;
+		int rightEdgeOfDeclarator = decl.length()-1;
+		int equalsIndex = decl.indexOf('=');
+		if ( equalsIndex>0 ) {
+			// everything after the '=' is the init value
+			this.initValue = decl.substring(equalsIndex+1,decl.length());
+			rightEdgeOfDeclarator = equalsIndex-1;
+		}
+		// walk backwards looking for start of an ID
+		for (int i=rightEdgeOfDeclarator; i>=0; i--) {
+			// if we haven't found the end yet, keep going
+			if ( !inID && Character.isLetterOrDigit(decl.charAt(i)) ) {
+			    inID = true;
+			}
+			else if ( inID &&
+				      !(Character.isLetterOrDigit(decl.charAt(i))||
+				       decl.charAt(i)=='_') ) {
+				start = i+1;
+				break;
+			}
+		}
+		if ( start<0 && inID ) {
+			start = 0;
+		}
+		if ( start<0 ) {
+			ErrorManager.error(ErrorManager.MSG_CANNOT_FIND_ATTRIBUTE_NAME_IN_DECL,decl);
+		}
+		// walk forwards looking for end of an ID
+		int stop=-1;
+		for (int i=start; i<=rightEdgeOfDeclarator; i++) {
+			// if we haven't found the end yet, keep going
+			if ( !(Character.isLetterOrDigit(decl.charAt(i))||
+				decl.charAt(i)=='_') )
+			{
+				stop = i;
+				break;
+			}
+			if ( i==rightEdgeOfDeclarator ) {
+				stop = i+1;
+			}
+		}
+
+		// the name is the last ID
+		this.name = decl.substring(start,stop);
+
+		// the type is the decl minus the ID (could be empty)
+		this.type = decl.substring(0,start);
+		if ( stop<=rightEdgeOfDeclarator ) {
+			this.type += decl.substring(stop,rightEdgeOfDeclarator+1);
+		}
+		this.type = type.trim();
+		if ( this.type.length()==0 ) {
+			this.type = null;
+		}
+
+		this.decl = decl;
+	}
+
+	public String toString() {
+		if ( initValue!=null ) {
+			return type+" "+name+"="+initValue;
+		}
+		return type+" "+name;
+	}
+}
+