1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.commons.jexl3.parser;
18
19
20 /**
21 * Identifiers, variables and registers.
22 */
23 public class ASTIdentifierAccess extends JexlNode {
24 /**
25 *
26 */
27 private static final long serialVersionUID = 1L;
28 private String name = null;
29 private Integer identifier = null;
30
31 ASTIdentifierAccess(final int id) {
32 super(id);
33 }
34
35 ASTIdentifierAccess(final Parser p, final int id) {
36 super(p, id);
37 }
38
39 void setIdentifier(final String id) {
40 name = id;
41 identifier = parseIdentifier(id);
42 }
43
44 @Override
45 public boolean isGlobalVar() {
46 return !isSafe() && !isExpression();
47 }
48
49 /**
50 * Whether this is a dot or a question-mark-dot aka safe-navigation access.
51 * @return true is ?., false if .
52 */
53 public boolean isSafe() {
54 return false;
55 }
56
57 /**
58 * Whether this is a Jxlt based identifier.
59 * @return true if `..${...}...`, false otherwise
60 */
61 public boolean isExpression() {
62 return false;
63 }
64
65 /**
66 * Parse an identifier which must be of the form:
67 * 0|([1-9][0-9]*)
68 * @param id the identifier
69 * @return an integer or null
70 */
71 public static Integer parseIdentifier(final String id) {
72 // hand coded because the was no way to fail on leading '0's using NumberFormat
73 if (id != null) {
74 final int length = id.length();
75 int val = 0;
76 for (int i = 0; i < length; ++i) {
77 final char c = id.charAt(i);
78 // leading 0s but no just 0, NaN
79 if (c == '0') {
80 if (length == 1) {
81 return 0;
82 }
83 if (val == 0) {
84 return null;
85 }
86 } // any non numeric, NaN
87 else if (c < '0' || c > '9') {
88 return null;
89 }
90 val *= 10;
91 val += (c - '0');
92 }
93 return val;
94 }
95 return null;
96 }
97
98 public Object getIdentifier() {
99 return identifier != null? identifier : name;
100 }
101
102 public String getName() {
103 return name;
104 }
105
106 @Override
107 public Object jjtAccept(final ParserVisitor visitor, final Object data) {
108 return visitor.visit(this, data);
109 }
110
111 @Override
112 public String toString() {
113 return name;
114 }
115 }