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创造一种迅速而又随性的(quick and dirty)xml解释器

王朝other·作者佚名  2008-05-31
窄屏简体版  字體: |||超大  

From Javaworld.com 翻译by matrix开源技术-chris

XML是一种当前很受欢迎的数据格式, 它的优点在于: 人性化,自述性以及使用的方便性.但是,不幸的是,基于java的xml解释器往往太大了,比如sun的jaXP.jar 和 parser.jar 每个都达到了1.4mb. 假如你要在只有有限的内存容量的运行环境里运行你的程序,比如j2me的环境.或者说带宽很有限的运行环境里,比如applet,这些大的package不应该成为你的选择对象.

注重:本篇的所有所需要的所有代码你可以通过此链接下载:

http://www.matrix.org.cn/down_view.ASP?id=67

下面是QDParser的代码:

package qdxml;

import java.io.*;

import java.util.*;

/** Quick and Dirty xml parser. This parser is, like the SAX parser,

an event based parser, but with mUCh less functionality. */

public class QDParser {

private static int popMode(Stack st) {

if(!st.empty())

return ((Integer)st.pop()).intvalue();

else

return PRE;

}

private final static int

TEXT = 1,

ENTITY = 2,

OPEN_TAG = 3,

CLOSE_TAG = 4,

START_TAG = 5,

ATTRIBUTE_Lvalue = 6,

ATTRIBUTE_EQUAL = 9,

ATTRIBUTE_Rvalue = 10,

QUOTE = 7,

IN_TAG = 8,

SINGLE_TAG = 12,

COMMENT = 13,

DONE = 11,

DOCTYPE = 14,

PRE = 15,

CDATA = 16;

public static void parse(DocHandler doc,Reader r) throws Exception {

Stack st = new Stack();

int depth = 0;

int mode = PRE;

int c = 0;

int quotec = ´"´;

depth = 0;

StringBuffer sb = new StringBuffer();

StringBuffer etag = new StringBuffer();

String tagName = null;

String lvalue = null;

String rvalue = null;

Hashtable attrs = null;

st = new Stack();

doc.startdocument.);

int line=1, col=0;

boolean eol = false;

while((c = r.read()) != -1) {

// We need to map

,

, and

to

// See XML spec section 2.11

if(c == ´

´ && eol) {

eol = false;

continue;

} else if(eol) {

eol = false;

} else if(c == ´

´) {

line++;

col=0;

} else if(c == ´

´) {

eol = true;

c = ´

´;

line++;

col=0;

} else {

col++;

}

if(mode == DONE) {

doc.enddocument.);

return;

// We are between tags collecting text.

} else if(mode == TEXT) {

if(c == ´<´) {

st.push(new Integer(mode));

mode = START_TAG;

if(sb.length() > 0) {

doc.text(sb.toString());

sb.setLength(0);

}

} else if(c == ´&´) {

st.push(new Integer(mode));

mode = ENTITY;

etag.setLength(0);

} else

sb.append((char)c);

// we are processing a closing tag: e.g. </foo>

} else if(mode == CLOSE_TAG) {

if(c == ´>´) {

mode = popMode(st);

tagName = sb.toString();

sb.setLength(0);

depth--;

if(depth==0)

mode = DONE;

doc.endElement(tagName);

} else {

sb.append((char)c);

}

// we are processing CDATA

} else if(mode == CDATA) {

if(c == ´>´

&& sb.toString().endsWith("]]")) {

sb.setLength(sb.length()-2);

doc.text(sb.toString());

sb.setLength(0);

mode = popMode(st);

} else

sb.append((char)c);

// we are processing a comment. We are inside

// the <!-- .... --> looking for the -->.

} else if(mode == COMMENT) {

if(c == ´>´

&& sb.toString().endsWith("--")) {

sb.setLength(0);

mode = popMode(st);

} else

sb.append((char)c);

// We are outside the root tag element

} else if(mode == PRE) {

if(c == ´<´) {

mode = TEXT;

st.push(new Integer(mode));

mode = START_TAG;

}

// We are inside one of these <? ... ?>

// or one of these <!DOCTYPE ... >

} else if(mode == DOCTYPE) {

if(c == ´>´) {

mode = popMode(st);

if(mode == TEXT) mode = PRE;

}

// we have just seen a < and

// are wondering what we are looking at

// <foo>, </foo>, <!-- ... --->, etc.

} else if(mode == START_TAG) {

mode = popMode(st);

if(c == ´/´) {

st.push(new Integer(mode));

mode = CLOSE_TAG;

} else if (c == ´?´) {

mode = DOCTYPE;

} else {

st.push(new Integer(mode));

mode = OPEN_TAG;

tagName = null;

attrs = new Hashtable();

sb.append((char)c);

}

// we are processing an entity, e.g. <, », etc.

} else if(mode == ENTITY) {

if(c == ´;´) {

mode = popMode(st);

String cent = etag.toString();

etag.setLength(0);

if(cent.equals("lt"))

sb.append(´<´);

else if(cent.equals("gt"))

sb.append(´>´);

else if(cent.equals("amp"))

sb.append(´&´);

else if(cent.equals("quot"))

sb.append(´"´);

else if(cent.equals("apos"))

sb.append(´´´);

// Could parse hex entities if we wanted to

//else if(cent.startsWith("#x"))

//sb.append((char)Integer.parseInt(cent.substring(2),16));

else if(cent.startsWith("#"))

sb.append((char)Integer.parseInt(cent.substring(1)));

// Insert custom entity definitions here

else

exc("Unknown entity: &"+cent+";",line,col);

} else {

etag.append((char)c);

}

// we have just seen something like this:

// <foo a="b"/

// and are looking for the final >.

} else if(mode == SINGLE_TAG) {

if(tagName == null)

tagName = sb.toString();

if(c != ´>´)

exc("Expected > for tag: <"+tagName+"/>",line,col);

doc.startElement(tagName,attrs);

doc.endElement(tagName);

if(depth==0) {

doc.enddocument.);

return;

}

sb.setLength(0);

attrs = new Hashtable();

tagName = null;

mode = popMode(st);

// we are processing something

// like this <foo ... >. It could

// still be a <!-- ... --> or something.

} else if(mode == OPEN_TAG) {

if(c == ´>´) {

if(tagName == null)

tagName = sb.toString();

sb.setLength(0);

depth++;

doc.startElement(tagName,attrs);

tagName = null;

attrs = new Hashtable();

mode = popMode(st);

} else if(c == ´/´) {

mode = SINGLE_TAG;

} else if(c == ´-´ && sb.toString().equals("!-")) {

mode = COMMENT;

} else if(c == ´[´ && sb.toString().equals("![CDATA")) {

mode = CDATA;

sb.setLength(0);

} else if(c == ´E´ && sb.toString().equals("!DOCTYP")) {

sb.setLength(0);

mode = DOCTYPE;

} else if(Character.isWhitespace((char)c)) {

tagName = sb.toString();

sb.setLength(0);

mode = IN_TAG;

} else {

sb.append((char)c);

}

// We are processing the quoted right-hand side

// of an element´s attribute.

} else if(mode == QUOTE) {

if(c == quotec) {

rvalue = sb.toString();

sb.setLength(0);

attrs.put(lvalue,rvalue);

mode = IN_TAG;

// See section the XML spec, section 3.3.3

// on normalization processing.

} else if("

 
 
 
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