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/*
* Copyright (c) 2007 through 2024 David Berkman
*
* This file is part of the SmallMind Code Project.
*
* The SmallMind Code Project is free software, you can redistribute
* it and/or modify it under either, at your discretion...
*
* 1) The terms of GNU Affero General Public License as published by the
* Free Software Foundation, either version 3 of the License, or (at
* your option) any later version.
*
* ...or...
*
* 2) The terms of the Apache License, Version 2.0.
*
* The SmallMind Code Project is distributed in the hope that it will
* be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License or Apache License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* and the Apache License along with the SmallMind Code Project. If not, see
* or .
*
* Additional permission under the GNU Affero GPL version 3 section 7
* ------------------------------------------------------------------
* If you modify this Program, or any covered work, by linking or
* combining it with other code, such other code is not for that reason
* alone subject to any of the requirements of the GNU Affero GPL
* version 3.
*/
package org.smallmind.web.json.scaffold.reflection;
import java.io.IOException;
import java.util.LinkedList;
import org.smallmind.nutsnbolts.reflection.bean.BeanAccessException;
public class ComponentParser {
private enum State {START_COMPONENT, START_METHOD_NAME, METHOD_NAME, END_METHOD_NAME, START_PARAMETERS, PARAMETERS, STRING, ESCAPE, END_PARAMETERS, START_SUBSCRIPT, END_SUBSCRIPT}
public static PathComponent[] parse (String methodChain)
throws BeanAccessException {
PathComponent[] components;
LinkedList componentList = new LinkedList<>();
if (methodChain != null) {
PathComponent component = null;
State state = State.START_COMPONENT;
int mark = -1;
int index = 0;
while (index < methodChain.length()) {
switch (state) {
case START_COMPONENT:
if (component != null) {
componentList.add(component);
component = null;
}
if (!Character.isWhitespace(methodChain.charAt(index))) {
state = State.START_METHOD_NAME;
} else {
index++;
}
break;
case START_METHOD_NAME:
if (!Character.isJavaIdentifierStart(methodChain.charAt(index))) {
throw new BeanAccessException("Illegal java identifier at index(%d) in method chain(%s)", index, methodChain);
}
mark = index++;
state = State.METHOD_NAME;
break;
case METHOD_NAME:
switch (methodChain.charAt(index)) {
case '.':
state = State.START_COMPONENT;
component = new PathComponent(methodChain.substring(mark, index));
break;
case '(':
state = State.START_PARAMETERS;
component = new PathComponent(methodChain.substring(mark, index));
break;
case '[':
state = State.START_SUBSCRIPT;
component = new PathComponent(methodChain.substring(mark, index));
mark = index + 1;
break;
default:
if (Character.isWhitespace(methodChain.charAt(index))) {
state = State.END_METHOD_NAME;
component = new PathComponent(methodChain.substring(mark, index));
} else if (!Character.isJavaIdentifierPart(methodChain.charAt(index))) {
throw new BeanAccessException("Illegal java identifier at index(%d) in method chain(%s)", index, methodChain);
}
}
index++;
break;
case END_METHOD_NAME:
switch (methodChain.charAt(index)) {
case '.':
state = State.START_COMPONENT;
break;
case '(':
state = State.START_PARAMETERS;
break;
case '[':
mark = index + 1;
state = State.START_SUBSCRIPT;
break;
default:
if (!Character.isWhitespace(methodChain.charAt(index))) {
throw new BeanAccessException("Illegal java identifier at index(%d) in method chain(%s)", index, methodChain);
}
}
index++;
break;
case START_PARAMETERS:
mark = index;
state = State.PARAMETERS;
break;
case PARAMETERS:
switch (methodChain.charAt(index)) {
case '"':
state = State.STRING;
break;
case ')':
try {
component.createArguments(methodChain.substring(mark, index));
} catch (IOException ioException) {
throw new BeanAccessException("Illegal parameter arguments at index(%d) in method chain(%s)", index, methodChain);
}
state = State.END_PARAMETERS;
break;
}
index++;
break;
case STRING:
switch (methodChain.charAt(index)) {
case '\\':
state = State.ESCAPE;
break;
case '"':
state = State.PARAMETERS;
break;
}
index++;
break;
case ESCAPE:
state = State.STRING;
index++;
break;
case END_PARAMETERS:
switch (methodChain.charAt(index)) {
case '.':
state = State.START_COMPONENT;
break;
case '[':
mark = index + 1;
state = State.START_SUBSCRIPT;
break;
default:
if (!Character.isWhitespace(methodChain.charAt(index))) {
throw new BeanAccessException("Illegal start of component at index(%d) in method chain(%s)", index, methodChain);
}
}
index++;
break;
case START_SUBSCRIPT:
if (methodChain.charAt(index) == ']') {
try {
component.addSubscript(methodChain.substring(mark, index).trim());
} catch (NumberFormatException numberFormatException) {
throw new BeanAccessException("Illegal subscript at index(%d) in method chain(%s)", mark, methodChain);
}
state = State.END_SUBSCRIPT;
}
index++;
break;
case END_SUBSCRIPT:
if (methodChain.charAt(index) == '.') {
state = State.START_COMPONENT;
} else if (!Character.isWhitespace(methodChain.charAt(index))) {
throw new BeanAccessException("Illegal start of component at index(%d) in method chain(%s)", index, methodChain);
}
index++;
break;
}
}
switch (state) {
case START_COMPONENT:
if (componentList.isEmpty()) {
throw new BeanAccessException("Empty method chain", methodChain);
}
throw new BeanAccessException("Missing termination in method chain(%s)", methodChain);
case METHOD_NAME:
componentList.add(new PathComponent(methodChain.substring(mark, index)));
break;
case END_METHOD_NAME:
componentList.add(component);
break;
case END_PARAMETERS:
componentList.add(component);
break;
case END_SUBSCRIPT:
componentList.add(component);
break;
default:
throw new BeanAccessException("Missing termination in method chain(%s)", methodChain);
}
}
components = new PathComponent[componentList.size()];
componentList.toArray(components);
return components;
}
}
