| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.commons.jexl3.parser; |
| |
| |
| /** |
| * Identifiers, variables and registers. |
| */ |
| public class ASTIdentifierAccess extends JexlNode { |
| private String name = null; |
| private Integer identifier = null; |
| |
| ASTIdentifierAccess(final int id) { |
| super(id); |
| } |
| |
| ASTIdentifierAccess(final Parser p, final int id) { |
| super(p, id); |
| } |
| |
| void setIdentifier(final String id) { |
| name = id; |
| identifier = parseIdentifier(id); |
| } |
| |
| @Override |
| public boolean isGlobalVar() { |
| return !isSafe() && !isExpression(); |
| } |
| |
| /** |
| * Whether this is a dot or a question-mark-dot aka safe-navigation access. |
| * @return true is ?., false if . |
| */ |
| public boolean isSafe() { |
| return false; |
| } |
| |
| /** |
| * Whether this is a Jxlt based identifier. |
| * @return true if `..${...}...`, false otherwise |
| */ |
| public boolean isExpression() { |
| return false; |
| } |
| |
| /** |
| * Parse an identifier which must be of the form: |
| * 0|([1-9][0-9]*) |
| * @param id the identifier |
| * @return an integer or null |
| */ |
| public static Integer parseIdentifier(final String id) { |
| // hand coded because the was no way to fail on leading '0's using NumberFormat |
| if (id != null) { |
| final int length = id.length(); |
| int val = 0; |
| for (int i = 0; i < length; ++i) { |
| final char c = id.charAt(i); |
| // leading 0s but no just 0, NaN |
| if (c == '0') { |
| if (length == 1) { |
| return 0; |
| } else if (val == 0) { |
| return null; |
| } |
| } // any non numeric, NaN |
| else if (c < '0' || c > '9') { |
| return null; |
| } |
| val *= 10; |
| val += (c - '0'); |
| } |
| return val; |
| } |
| return null; |
| } |
| |
| public Object getIdentifier() { |
| return identifier != null? identifier : name; |
| } |
| |
| public String getName() { |
| return name; |
| } |
| |
| @Override |
| public Object jjtAccept(final ParserVisitor visitor, final Object data) { |
| return visitor.visit(this, data); |
| } |
| |
| @Override |
| public String toString() { |
| return name; |
| } |
| } |