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XML parser component of GenJava-Core.
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/*
* Copyright (c) 2003, Henri Yandell
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the
* following conditions are met:
*
* + Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* + Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* + Neither the name of Genjava-Core nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
package com.generationjava.io.xml;
import java.io.Reader;
import java.io.IOException;
import java.util.Stack;
/**
* A tiny parser of xml text. It is intended to deal with simple
* config files.
*/
public class XMLParser {
// various states in which the parser may be.
private static final int VACUUM = 1;
private static final int IN_TAG = 2;
private static final int IN_TAG_NAME = 3;
private static final int CLOSING_TAG = 9;
private static final int SLASH = 4;
private static final int ATTR_NAME = 5;
private static final int END_ATTR_NAME = 6;
private static final int ATTR_VALUE = 7;
private static final int END_ATTR_VALUE = 8;
private static final int START_COMMENT = 10;
private static final int IN_COMMENT = 11;
// special state to handle the DOCTYPE 'tag'
private static final int IN_DOCTYPE = 12;
private static final int IN_DTD = 13;
public XMLParser() {
}
/**
* Parse an XML text read in from a Reader.
* Returns the root node of the xml text.
*/
public XMLNode parseXML(Reader reader) throws IOException {
int state = VACUUM;
int x = 1; // current character number
int y = 1; // current line number
int rch = 0;
char ch;
boolean pi = false;
StringBuffer tag_name = new StringBuffer();
StringBuffer attr_name = new StringBuffer();
StringBuffer attr_value = new StringBuffer();
StringBuffer value = new StringBuffer();
XMLNode root = null;
XMLNode node = null;
// the current parent.
XMLNode parent = null;
// Stack is used to remember the hierarchy of parents.
Stack stack = new Stack();
while( (rch = reader.read()) != -1) {
ch = (char)rch;
// QUERY: Should newlines only be allowed in a VACUUM ?
// error messaging
x++;
if(ch == '\n') {
y++;
x = 1;
continue;
}
switch(state) {
case VACUUM: {
if(ch == '<') {
pi = false;
state = IN_TAG_NAME;
if( value.length() != 0 ) {
node = new XMLNode(tag_name.toString());
node.setPlaintext(value.toString().trim());
parent.addNode(node);
value.setLength(0);
}
} else
if( (ch == ' ') || (ch == '\t') ) {
if(value.length() != 0) {
value.append(ch);
}
continue;
} else
if(ch == '\r') { // part of a newline.
if(value.length() != 0) {
value.append(ch);
}
continue;
} else {
value.append(ch);
}
}
break;
case START_COMMENT: {
if(ch == '-') {
// feels bad to do this here.
ch = (char)reader.read();
if(ch == '-') {
state = IN_COMMENT;
} else {
value.append("!-");
value.append(ch);
}
} else {
tag_name.append('!');
tag_name.append(ch);
state = IN_TAG_NAME;
}
}
break;
case IN_COMMENT: {
if(ch == '-') {
// feels bad to do this here.
ch = (char)reader.read();
if(ch == '-') {
ch = (char)reader.read();
if(ch == '>') {
node = new XMLNode();
node.setPlaintext(value.toString().trim());
node.setComment(true);
if(parent == null) {
parent = new XMLNode();
parent.setInvisible(true);
root = parent;
}
parent.addNode(node);
value.setLength(0);
state = VACUUM;
} else {
value.append("--");
value.append(ch);
}
} else {
value.append("-");
value.append(ch);
}
} else {
value.append(ch);
}
}
break;
case IN_DOCTYPE: {
if(ch == '[') {
value.append(ch);
state = IN_DTD;
} else
if(ch == '>') {
node = new XMLNode("!DOCTYPE");
node.setPlaintext(value.toString());
node.setDocType(true);
if(parent == null) {
parent = new XMLNode();
parent.setInvisible(true);
root = parent;
}
parent.addNode(node);
value.setLength(0);
state = VACUUM;
} else {
value.append(ch);
}
}
break;
case IN_DTD: {
if(ch == ']') {
value.append(ch);
state = IN_DOCTYPE;
} else {
value.append(ch);
}
}
case IN_TAG_NAME: {
if( (ch == '!') && (tag_name.length() == 0) ) {
state = START_COMMENT;
} else
if( !pi && (ch == '?') && (tag_name.length() == 0) ) {
pi = true;
} else
if( (ch == '/') && (tag_name.length() == 0) ) {
// closing tag
parent = (XMLNode)stack.pop();
state = CLOSING_TAG;
} else
if( ((ch == ' ') || (ch == '\t') || (ch == '>') || (ch == '/')) || (ch == '?') ) {
if("!DOCTYPE".equals(tag_name.toString())) {
state = IN_DOCTYPE;
tag_name.setLength(0);
continue;
}
if(pi) {
if(parent == null) {
parent = new XMLNode();
parent.setInvisible(true);
root = parent;
}
}
node = new XMLNode(tag_name.toString());
node.setPI(pi);
pi = false;
if(root == null) {
root = node;
}
if(parent != null) {
parent.addNode(node);
}
tag_name.setLength(0);
if( (ch == '/') || (ch == '?') ) {
state = SLASH;
} else
if(ch == '>') {
state = VACUUM;
stack.push(parent);
parent = node;
} else {
state = IN_TAG;
}
} else {
tag_name.append(ch);
}
}
break;
case IN_TAG: {
if((ch == ' ') || (ch == '\t') ) {
continue;
} else
if(ch == '>') {
state = VACUUM;
stack.push(parent);
parent = node;
} else
if( (ch == '/') || (ch == '?') ) {
// empty tag
state = SLASH;
} else {
state = ATTR_NAME;
attr_name.setLength(1);
attr_name.setCharAt(0,ch);
}
}
break;
case SLASH: {
if(ch == '>') {
state = VACUUM;
} else {
state = IN_TAG;
}
}
break;
case CLOSING_TAG: {
if(ch == '>') {
state = VACUUM;
} else {
continue;
}
}
break;
case ATTR_NAME: {
if((ch == ' ') || (ch == '\t') ) {
node.addAttr(attr_name.toString(), attr_name.toString());
state = IN_TAG;
} else
if(ch == '=') {
state = END_ATTR_NAME;
} else {
attr_name.append(ch);
}
}
break;
case END_ATTR_NAME: {
if(ch == '"') {
state = ATTR_VALUE;
attr_value.setLength(0);
} else {
state = ATTR_NAME;
}
}
break;
case ATTR_VALUE: {
if(ch == '"') {
node.addAttr(attr_name.toString(), attr_value.toString());
state = IN_TAG;
} else {
attr_value.append(ch);
}
}
break;
}
}
return root;
}
}
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