src/main/java/de/uniks/networkparser/yaml/YAMLTokener.java
package de.uniks.networkparser.yaml;
/*
The MIT License
Copyright (c) 2010-2016 Stefan Lindel https://www.github.com/fujaba/NetworkParser/
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/
import de.uniks.networkparser.Tokener;
import de.uniks.networkparser.buffer.Buffer;
import de.uniks.networkparser.buffer.CharacterBuffer;
import de.uniks.networkparser.interfaces.BaseItem;
import de.uniks.networkparser.interfaces.BufferItem;
import de.uniks.networkparser.interfaces.EntityList;
import de.uniks.networkparser.interfaces.SendableEntityCreator;
import de.uniks.networkparser.list.SimpleKeyValueList;
import de.uniks.networkparser.list.SimpleList;
public class YAMLTokener extends Tokener {
public static final char DASH = '-';
public static final String STOPCHARS = "=# ";
public static final char RETURN = '\n';
private SimpleKeyValueList<Object, SimpleKeyValueList<String, SimpleList<String>>> refs;
@Override
public EntityList parseToEntity(BaseItem entity, Object buffer) {
if (buffer != null && buffer instanceof Buffer && entity instanceof EntityList) {
EntityList list = (EntityList) entity;
parseLine(0, list, (Buffer) buffer);
return list;
}
return null;
}
protected int parseLine(int deep, EntityList owner, Buffer buffer) {
if (buffer == null) {
return 0;
}
char c = buffer.getCurrentChar();
int newDeep = 0;
boolean read = false;
BaseItem item = null;
do {
if (read) {
c = buffer.getChar();
}
read = true;
if (c == BufferItem.SPACE) {
newDeep++;
continue;
}
if (newDeep < deep) {
return newDeep;
}
if (c == '\r') {
c = buffer.getChar();
}
if (c == '\n') {
/* Next Line */
parseLine(newDeep, owner, buffer);
c = 0;
continue;
}
/* Parsing the CurrentLine */
CharacterBuffer subBuffer = null;
switch (c) {
case 0:
break;
case ENTER:
break;
case '-':
c = buffer.getChar();
/* Must be a Space */
if (c == BufferItem.SPACE) {
/* Collection */
if (deep <= newDeep) {
/* Add to Current List */
item = owner.getNewList(false);
} else {
item = owner.getNewList(true);
}
}
/* Must be a String so its default */
default:
if (subBuffer == null) {
subBuffer = new CharacterBuffer();
}
subBuffer.with(c);
break;
}
} while (c != 0);
if (buffer != null && owner != null) {
if (item == null) {
item = owner.getNewList(false);
}
if (item instanceof YamlItem) {
((YamlItem) item).withKey(buffer.toString());
}
owner.add(item);
}
return newDeep;
}
/**
* Decoding YAML FILE
*
* @param yaml Yaml Text
* @return decoded Value
*
* yaml grammar yaml ::= objects* object ::= plainObject | objectList
* plainObject ::= - type': ' objId\n attr* attr ::= attrName': '
* attrValue\n attrValue ::= id | string | '[' attrValue * ']'
* objectList ::= type colName:* \n key: attrValue* \n* valueRow ::=
* attrValue*
*/
public Object decode(String yaml) {
CharacterBuffer buffer = new CharacterBuffer().with(yaml);
Object root = null;
refs = new SimpleKeyValueList<Object, SimpleKeyValueList<String, SimpleList<String>>>();
while (buffer.isEnd() == false) {
if (DASH != buffer.getCurrentChar()) {
buffer.printError("'-' expected");
break;
}
buffer.skipChar(DASH);
CharacterBuffer key = buffer.nextString();
if (key.endsWith(":", true)) {
/* usual */
Object returnValue = parseUsualObjectAttrs(key, buffer);
if (root == null) {
root = returnValue;
}
continue;
}
parseObjectTableAttrs(key, buffer);
}
/* CHECK IF REF NOT EMPTY */
if (refs.size() > 0) {
for (int o = 0; o < refs.size(); o++) {
Object entity = refs.getKeyByIndex(o);
SendableEntityCreator creator = map.getCreatorClass(entity);
SimpleKeyValueList<String, SimpleList<String>> entityRefs = refs.getValueByIndex(o);
for (int r = 0; r < entityRefs.size(); r++) {
String attribute = entityRefs.getKeyByIndex(r);
SimpleList<String> valueRefs = entityRefs.getValueByIndex(r);
for (String ref : valueRefs) {
Object value = map.getObject(ref);
if (value != null) {
creator.setValue(entity, attribute, value, SendableEntityCreator.NEW);
}
}
}
}
}
return root;
}
private void parseObjectTableAttrs(CharacterBuffer currentToken, Buffer buffer) {
/* skip column names */
if (currentToken == null || map == null) {
return;
}
String className = currentToken.toString();
SendableEntityCreator creator = map.getCreator(className, false);
currentToken = buffer.nextString();
SimpleList<String> colNameList = new SimpleList<String>();
while (currentToken.length() > 0 && currentToken.endsWith(":", true)) {
colNameList.add(currentToken.rtrim(COLON).toString());
buffer.skipChar(BufferItem.SPACE);
if (buffer.getCurrentChar() == RETURN) {
currentToken = buffer.nextString();
break;
}
currentToken = buffer.nextString();
}
while (currentToken.length() > 0 && currentToken.equals("-") == false) {
String objectId = currentToken.rtrim(COLON).toString();
currentToken = buffer.nextString();
Object obj = map.getObject(objectId);
if (obj == null) {
obj = creator.getSendableInstance(false);
map.put(objectId, obj, false);
}
/* column values */
int colNum = 0;
while (currentToken.length() > 0 && !currentToken.endsWith(":", true)
&& currentToken.equals("-") == false) {
String attrName = colNameList.get(colNum);
if (currentToken.startsWith("[")) {
String value = currentToken.substring(1);
if (value.trim().equals("")) {
value = buffer.nextString().toString();
}
setValue(creator, obj, attrName, value);
while (currentToken.length() > 0 && !currentToken.endsWith("]", true)) {
currentToken = buffer.nextString();
value = currentToken.toString();
if (currentToken.endsWith("]", true)) {
value = currentToken.substring(0, currentToken.length() - 1);
}
if (value.trim().equals("") == false ) {
setValue(creator, obj, attrName, value);
}
}
} else {
setValue(creator, obj, attrName, currentToken.toString());
}
colNum++;
currentToken = buffer.nextString();
}
if (currentToken.equals("-")) {
buffer.withLookAHead(DASH);
}
}
}
private Object parseUsualObjectAttrs(CharacterBuffer currentToken, Buffer buffer) {
if (buffer == null || currentToken == null || map == null) {
return null;
}
String objectId = currentToken.trimEnd(1).toString();
String className = buffer.nextString().rtrim().toString();
currentToken = buffer.nextString();
SendableEntityCreator creator = map.getCreator(className, false);
Object obj = map.getObject(objectId);
if (obj == null) {
obj = creator.getSendableInstance(false);
map.put(objectId, obj, false);
}
/* read attributes */
while (currentToken.equals("") == false && !currentToken.equals("-")) {
String attrName = currentToken.rtrim(':').toString();
currentToken = buffer.nextString();
/* many values */
while (currentToken.equals("") == false && !currentToken.endsWith(":", true) && !currentToken.equals("-")) {
String attrValue = currentToken.toString();
setValue(creator, obj, attrName, attrValue);
currentToken = buffer.nextString();
}
if (currentToken.equals("-")) {
buffer.withLookAHead('-');
}
}
return obj;
}
private boolean setValue(SendableEntityCreator creator, Object obj, String attrName, String attrValue) {
if (map == null) {
return false;
}
Object targetObj = map.getObject(attrValue);
if (targetObj != null) {
try {
creator.setValue(obj, attrName, targetObj, SendableEntityCreator.NEW);
} catch (Exception e) {
creator.setValue(obj, attrName, attrValue, SendableEntityCreator.NEW);
}
return true;
}
SimpleKeyValueList<String, SimpleList<String>> values = refs.get(obj);
try {
if (values != null) {
SimpleList<String> valueNames = values.get(attrName);
if (valueNames != null) {
valueNames.add(attrValue);
return true;
}
}
creator.setValue(obj, attrName, attrValue, SendableEntityCreator.NEW);
} catch (Exception e) {
/* maybe a node */
if (values == null) {
values = new SimpleKeyValueList<String, SimpleList<String>>();
refs.put(obj, values);
}
SimpleList<String> valueNames = values.get(attrName);
if (valueNames != null) {
valueNames.add(attrValue);
} else {
valueNames = new SimpleList<String>();
valueNames.add(attrValue);
values.put(attrName, valueNames);
}
}
return true;
}
}