Source Code Cross Referenced for Attribute.java in  » Parser » antlr-3.0.1 » org » antlr » tool » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Parser » antlr 3.0.1 » org.antlr.tool 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         [The "BSD licence"]
003:         Copyright (c) 2005-2006 Terence Parr
004:         All rights reserved.
005:
006:         Redistribution and use in source and binary forms, with or without
007:         modification, are permitted provided that the following conditions
008:         are met:
009:         1. Redistributions of source code must retain the above copyright
010:            notice, this list of conditions and the following disclaimer.
011:         2. Redistributions in binary form must reproduce the above copyright
012:            notice, this list of conditions and the following disclaimer in the
013:            documentation and/or other materials provided with the distribution.
014:         3. The name of the author may not be used to endorse or promote products
015:            derived from this software without specific prior written permission.
016:
017:         THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
018:         IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
019:         OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
020:         IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
021:         INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
022:         NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
023:         DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
024:         THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
025:         (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
026:         THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
027:         */
028:        package org.antlr.tool;
029:
030:        /** Track the names of attributes define in arg lists, return values,
031:         *  scope blocks etc...
032:         */
033:        public class Attribute {
034:            /** The entire declaration such as "String foo;" */
035:            public String decl;
036:
037:            /** The type; might be empty such as for Python which has no static typing */
038:            public String type;
039:
040:            /** The name of the attribute "foo" */
041:            public String name;
042:
043:            /** The optional attribute intialization expression */
044:            public String initValue;
045:
046:            public Attribute(String decl) {
047:                extractAttribute(decl);
048:            }
049:
050:            public Attribute(String name, String decl) {
051:                this .name = name;
052:                this .decl = decl;
053:            }
054:
055:            /** For decls like "String foo" or "char *foo32[3]" compute the ID
056:             *  and type declarations.  Also handle "int x=3" and 'T t = new T("foo")'
057:             *  but if the separator is ',' you cannot use ',' in the initvalue.
058:             *  AttributeScope.addAttributes takes care of the separation so we are
059:             *  free here to use from '=' to end of string as the expression.
060:             *
061:             *  Set name, type, initvalue, and full decl instance vars.
062:             */
063:            protected void extractAttribute(String decl) {
064:                if (decl == null) {
065:                    return;
066:                }
067:                boolean inID = false;
068:                int start = -1;
069:                int rightEdgeOfDeclarator = decl.length() - 1;
070:                int equalsIndex = decl.indexOf('=');
071:                if (equalsIndex > 0) {
072:                    // everything after the '=' is the init value
073:                    this .initValue = decl.substring(equalsIndex + 1, decl
074:                            .length());
075:                    rightEdgeOfDeclarator = equalsIndex - 1;
076:                }
077:                // walk backwards looking for start of an ID
078:                for (int i = rightEdgeOfDeclarator; i >= 0; i--) {
079:                    // if we haven't found the end yet, keep going
080:                    if (!inID && Character.isLetterOrDigit(decl.charAt(i))) {
081:                        inID = true;
082:                    } else if (inID
083:                            && !(Character.isLetterOrDigit(decl.charAt(i)) || decl
084:                                    .charAt(i) == '_')) {
085:                        start = i + 1;
086:                        break;
087:                    }
088:                }
089:                if (start < 0 && inID) {
090:                    start = 0;
091:                }
092:                if (start < 0) {
093:                    ErrorManager
094:                            .error(
095:                                    ErrorManager.MSG_CANNOT_FIND_ATTRIBUTE_NAME_IN_DECL,
096:                                    decl);
097:                }
098:                // walk forwards looking for end of an ID
099:                int stop = -1;
100:                for (int i = start; i <= rightEdgeOfDeclarator; i++) {
101:                    // if we haven't found the end yet, keep going
102:                    if (!(Character.isLetterOrDigit(decl.charAt(i)) || decl
103:                            .charAt(i) == '_')) {
104:                        stop = i;
105:                        break;
106:                    }
107:                    if (i == rightEdgeOfDeclarator) {
108:                        stop = i + 1;
109:                    }
110:                }
111:
112:                // the name is the last ID
113:                this .name = decl.substring(start, stop);
114:
115:                // the type is the decl minus the ID (could be empty)
116:                this .type = decl.substring(0, start);
117:                if (stop <= rightEdgeOfDeclarator) {
118:                    this .type += decl
119:                            .substring(stop, rightEdgeOfDeclarator + 1);
120:                }
121:                this .type = type.trim();
122:                if (this .type.length() == 0) {
123:                    this .type = null;
124:                }
125:
126:                this .decl = decl;
127:            }
128:
129:            public String toString() {
130:                if (initValue != null) {
131:                    return type + " " + name + "=" + initValue;
132:                }
133:                return type + " " + name;
134:            }
135:        }
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