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745 lines
29 KiB
Java
745 lines
29 KiB
Java
/*
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* Copyright (c) 2007 Henri Sivonen
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* Copyright (c) 2008-2010 Mozilla Foundation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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package nu.validator.htmlparser.impl;
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import java.io.IOException;
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import nu.validator.htmlparser.annotation.Auto;
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import nu.validator.htmlparser.annotation.NoLength;
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import nu.validator.htmlparser.common.ByteReadable;
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import org.xml.sax.SAXException;
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public abstract class MetaScanner {
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/**
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* Constant for "charset".
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*/
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private static final @NoLength char[] CHARSET = "charset".toCharArray();
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/**
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* Constant for "content".
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*/
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private static final @NoLength char[] CONTENT = "content".toCharArray();
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private static final int NO = 0;
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private static final int M = 1;
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private static final int E = 2;
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private static final int T = 3;
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private static final int A = 4;
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private static final int DATA = 0;
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private static final int TAG_OPEN = 1;
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private static final int SCAN_UNTIL_GT = 2;
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private static final int TAG_NAME = 3;
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private static final int BEFORE_ATTRIBUTE_NAME = 4;
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private static final int ATTRIBUTE_NAME = 5;
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private static final int AFTER_ATTRIBUTE_NAME = 6;
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private static final int BEFORE_ATTRIBUTE_VALUE = 7;
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private static final int ATTRIBUTE_VALUE_DOUBLE_QUOTED = 8;
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private static final int ATTRIBUTE_VALUE_SINGLE_QUOTED = 9;
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private static final int ATTRIBUTE_VALUE_UNQUOTED = 10;
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private static final int AFTER_ATTRIBUTE_VALUE_QUOTED = 11;
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private static final int MARKUP_DECLARATION_OPEN = 13;
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private static final int MARKUP_DECLARATION_HYPHEN = 14;
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private static final int COMMENT_START = 15;
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private static final int COMMENT_START_DASH = 16;
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private static final int COMMENT = 17;
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private static final int COMMENT_END_DASH = 18;
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private static final int COMMENT_END = 19;
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private static final int SELF_CLOSING_START_TAG = 20;
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/**
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* The data source.
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*/
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protected ByteReadable readable;
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/**
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* The state of the state machine that recognizes the tag name "meta".
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*/
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private int metaState = NO;
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/**
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* The current position in recognizing the attribute name "content".
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*/
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private int contentIndex = -1;
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/**
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* The current position in recognizing the attribute name "charset".
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*/
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private int charsetIndex = -1;
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/**
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* The tokenizer state.
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*/
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protected int stateSave = DATA;
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/**
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* The currently filled length of strBuf.
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*/
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private int strBufLen;
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/**
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* Accumulation buffer for attribute values.
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*/
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private @Auto char[] strBuf;
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// [NOCPP[
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/**
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* @param source
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* @param errorHandler
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* @param publicId
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* @param systemId
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*/
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public MetaScanner() {
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this.readable = null;
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this.metaState = NO;
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this.contentIndex = -1;
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this.charsetIndex = -1;
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this.stateSave = DATA;
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strBufLen = 0;
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strBuf = new char[36];
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}
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/**
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* Reads a byte from the data source.
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*
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* -1 means end.
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* @return
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* @throws IOException
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*/
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protected int read() throws IOException {
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return readable.readByte();
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}
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// ]NOCPP]
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// WARNING When editing this, makes sure the bytecode length shown by javap
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// stays under 8000 bytes!
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/**
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* The runs the meta scanning algorithm.
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*/
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protected final void stateLoop(int state)
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throws SAXException, IOException {
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int c = -1;
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boolean reconsume = false;
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stateloop: for (;;) {
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switch (state) {
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case DATA:
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dataloop: for (;;) {
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if (reconsume) {
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reconsume = false;
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} else {
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c = read();
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}
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switch (c) {
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case -1:
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break stateloop;
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case '<':
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state = MetaScanner.TAG_OPEN;
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break dataloop; // FALL THROUGH continue
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// stateloop;
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default:
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continue;
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}
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}
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// WARNING FALLTHRU CASE TRANSITION: DON'T REORDER
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case TAG_OPEN:
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tagopenloop: for (;;) {
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c = read();
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switch (c) {
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case -1:
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break stateloop;
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case 'm':
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case 'M':
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metaState = M;
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state = MetaScanner.TAG_NAME;
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break tagopenloop;
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// continue stateloop;
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case '!':
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state = MetaScanner.MARKUP_DECLARATION_OPEN;
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continue stateloop;
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case '?':
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case '/':
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state = MetaScanner.SCAN_UNTIL_GT;
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continue stateloop;
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case '>':
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state = MetaScanner.DATA;
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continue stateloop;
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default:
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if ((c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z')) {
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metaState = NO;
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state = MetaScanner.TAG_NAME;
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break tagopenloop;
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// continue stateloop;
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}
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state = MetaScanner.DATA;
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reconsume = true;
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continue stateloop;
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}
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}
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// FALL THROUGH DON'T REORDER
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case TAG_NAME:
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tagnameloop: for (;;) {
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c = read();
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switch (c) {
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case -1:
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break stateloop;
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case ' ':
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case '\t':
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case '\n':
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case '\u000C':
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state = MetaScanner.BEFORE_ATTRIBUTE_NAME;
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break tagnameloop;
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// continue stateloop;
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case '/':
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state = MetaScanner.SELF_CLOSING_START_TAG;
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continue stateloop;
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case '>':
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state = MetaScanner.DATA;
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continue stateloop;
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case 'e':
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case 'E':
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if (metaState == M) {
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metaState = E;
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} else {
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metaState = NO;
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}
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continue;
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case 't':
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case 'T':
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if (metaState == E) {
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metaState = T;
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} else {
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metaState = NO;
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}
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continue;
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case 'a':
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case 'A':
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if (metaState == T) {
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metaState = A;
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} else {
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metaState = NO;
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}
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continue;
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default:
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metaState = NO;
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continue;
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}
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}
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// FALLTHRU DON'T REORDER
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case BEFORE_ATTRIBUTE_NAME:
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beforeattributenameloop: for (;;) {
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if (reconsume) {
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reconsume = false;
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} else {
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c = read();
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}
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/*
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* Consume the next input character:
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*/
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switch (c) {
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case -1:
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break stateloop;
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case ' ':
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case '\t':
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case '\n':
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case '\u000C':
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continue;
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case '/':
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state = MetaScanner.SELF_CLOSING_START_TAG;
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continue stateloop;
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case '>':
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state = DATA;
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continue stateloop;
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case 'c':
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case 'C':
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contentIndex = 0;
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charsetIndex = 0;
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state = MetaScanner.ATTRIBUTE_NAME;
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break beforeattributenameloop;
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default:
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contentIndex = -1;
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charsetIndex = -1;
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state = MetaScanner.ATTRIBUTE_NAME;
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break beforeattributenameloop;
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// continue stateloop;
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}
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}
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// FALLTHRU DON'T REORDER
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case ATTRIBUTE_NAME:
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attributenameloop: for (;;) {
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c = read();
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switch (c) {
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case -1:
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break stateloop;
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case ' ':
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case '\t':
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case '\n':
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case '\u000C':
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state = MetaScanner.AFTER_ATTRIBUTE_NAME;
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continue stateloop;
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case '/':
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state = MetaScanner.SELF_CLOSING_START_TAG;
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continue stateloop;
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case '=':
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strBufLen = 0;
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state = MetaScanner.BEFORE_ATTRIBUTE_VALUE;
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break attributenameloop;
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// continue stateloop;
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case '>':
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state = MetaScanner.DATA;
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continue stateloop;
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default:
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if (metaState == A) {
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if (c >= 'A' && c <= 'Z') {
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c += 0x20;
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}
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if (contentIndex == 6) {
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contentIndex = -1;
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} else if (contentIndex > -1
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&& contentIndex < 6
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&& (c == CONTENT[contentIndex + 1])) {
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contentIndex++;
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}
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if (charsetIndex == 6) {
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charsetIndex = -1;
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} else if (charsetIndex > -1
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&& charsetIndex < 6
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&& (c == CHARSET[charsetIndex + 1])) {
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charsetIndex++;
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}
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}
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continue;
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}
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}
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// FALLTHRU DON'T REORDER
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case BEFORE_ATTRIBUTE_VALUE:
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beforeattributevalueloop: for (;;) {
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c = read();
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switch (c) {
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case -1:
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break stateloop;
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case ' ':
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case '\t':
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case '\n':
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case '\u000C':
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continue;
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case '"':
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state = MetaScanner.ATTRIBUTE_VALUE_DOUBLE_QUOTED;
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break beforeattributevalueloop;
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// continue stateloop;
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case '\'':
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state = MetaScanner.ATTRIBUTE_VALUE_SINGLE_QUOTED;
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continue stateloop;
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case '>':
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state = MetaScanner.DATA;
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continue stateloop;
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default:
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if (charsetIndex == 6 || contentIndex == 6) {
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addToBuffer(c);
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}
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state = MetaScanner.ATTRIBUTE_VALUE_UNQUOTED;
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continue stateloop;
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}
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}
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// FALLTHRU DON'T REORDER
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case ATTRIBUTE_VALUE_DOUBLE_QUOTED:
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attributevaluedoublequotedloop: for (;;) {
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if (reconsume) {
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reconsume = false;
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} else {
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c = read();
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}
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switch (c) {
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case -1:
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break stateloop;
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case '"':
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if (tryCharset()) {
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break stateloop;
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}
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state = MetaScanner.AFTER_ATTRIBUTE_VALUE_QUOTED;
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break attributevaluedoublequotedloop;
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// continue stateloop;
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default:
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if (metaState == A && (contentIndex == 6 || charsetIndex == 6)) {
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addToBuffer(c);
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}
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continue;
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}
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}
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// FALLTHRU DON'T REORDER
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case AFTER_ATTRIBUTE_VALUE_QUOTED:
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afterattributevaluequotedloop: for (;;) {
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c = read();
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switch (c) {
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case -1:
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break stateloop;
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case ' ':
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case '\t':
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case '\n':
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case '\u000C':
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state = MetaScanner.BEFORE_ATTRIBUTE_NAME;
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continue stateloop;
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case '/':
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state = MetaScanner.SELF_CLOSING_START_TAG;
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break afterattributevaluequotedloop;
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// continue stateloop;
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case '>':
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state = MetaScanner.DATA;
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continue stateloop;
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default:
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state = MetaScanner.BEFORE_ATTRIBUTE_NAME;
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reconsume = true;
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continue stateloop;
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}
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}
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// FALLTHRU DON'T REORDER
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case SELF_CLOSING_START_TAG:
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c = read();
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switch (c) {
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case -1:
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break stateloop;
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case '>':
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state = MetaScanner.DATA;
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continue stateloop;
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default:
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state = MetaScanner.BEFORE_ATTRIBUTE_NAME;
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reconsume = true;
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continue stateloop;
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}
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// XXX reorder point
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case ATTRIBUTE_VALUE_UNQUOTED:
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for (;;) {
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if (reconsume) {
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reconsume = false;
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} else {
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c = read();
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}
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switch (c) {
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case -1:
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break stateloop;
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case ' ':
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case '\t':
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case '\n':
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case '\u000C':
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if (tryCharset()) {
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break stateloop;
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}
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state = MetaScanner.BEFORE_ATTRIBUTE_NAME;
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continue stateloop;
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case '>':
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if (tryCharset()) {
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break stateloop;
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}
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state = MetaScanner.DATA;
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continue stateloop;
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default:
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if (metaState == A && (contentIndex == 6 || charsetIndex == 6)) {
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addToBuffer(c);
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}
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continue;
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}
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}
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// XXX reorder point
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case AFTER_ATTRIBUTE_NAME:
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for (;;) {
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c = read();
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switch (c) {
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case -1:
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break stateloop;
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case ' ':
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case '\t':
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case '\n':
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case '\u000C':
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continue;
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case '/':
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if (tryCharset()) {
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break stateloop;
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}
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state = MetaScanner.SELF_CLOSING_START_TAG;
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continue stateloop;
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case '=':
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state = MetaScanner.BEFORE_ATTRIBUTE_VALUE;
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continue stateloop;
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case '>':
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if (tryCharset()) {
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break stateloop;
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}
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state = MetaScanner.DATA;
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continue stateloop;
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case 'c':
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case 'C':
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contentIndex = 0;
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charsetIndex = 0;
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state = MetaScanner.ATTRIBUTE_NAME;
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continue stateloop;
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default:
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contentIndex = -1;
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charsetIndex = -1;
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state = MetaScanner.ATTRIBUTE_NAME;
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continue stateloop;
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}
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}
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// XXX reorder point
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case MARKUP_DECLARATION_OPEN:
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markupdeclarationopenloop: for (;;) {
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c = read();
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switch (c) {
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case -1:
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break stateloop;
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case '-':
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state = MetaScanner.MARKUP_DECLARATION_HYPHEN;
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break markupdeclarationopenloop;
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// continue stateloop;
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default:
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state = MetaScanner.SCAN_UNTIL_GT;
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reconsume = true;
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continue stateloop;
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}
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}
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// FALLTHRU DON'T REORDER
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case MARKUP_DECLARATION_HYPHEN:
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markupdeclarationhyphenloop: for (;;) {
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c = read();
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switch (c) {
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case -1:
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break stateloop;
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case '-':
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state = MetaScanner.COMMENT_START;
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break markupdeclarationhyphenloop;
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// continue stateloop;
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default:
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state = MetaScanner.SCAN_UNTIL_GT;
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reconsume = true;
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continue stateloop;
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}
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}
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// FALLTHRU DON'T REORDER
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case COMMENT_START:
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commentstartloop: for (;;) {
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c = read();
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switch (c) {
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case -1:
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break stateloop;
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case '-':
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state = MetaScanner.COMMENT_START_DASH;
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continue stateloop;
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case '>':
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state = MetaScanner.DATA;
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continue stateloop;
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default:
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state = MetaScanner.COMMENT;
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break commentstartloop;
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// continue stateloop;
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}
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}
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// FALLTHRU DON'T REORDER
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case COMMENT:
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commentloop: for (;;) {
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c = read();
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switch (c) {
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case -1:
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break stateloop;
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case '-':
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state = MetaScanner.COMMENT_END_DASH;
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break commentloop;
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// continue stateloop;
|
|
default:
|
|
continue;
|
|
}
|
|
}
|
|
// FALLTHRU DON'T REORDER
|
|
case COMMENT_END_DASH:
|
|
commentenddashloop: for (;;) {
|
|
c = read();
|
|
switch (c) {
|
|
case -1:
|
|
break stateloop;
|
|
case '-':
|
|
state = MetaScanner.COMMENT_END;
|
|
break commentenddashloop;
|
|
// continue stateloop;
|
|
default:
|
|
state = MetaScanner.COMMENT;
|
|
continue stateloop;
|
|
}
|
|
}
|
|
// FALLTHRU DON'T REORDER
|
|
case COMMENT_END:
|
|
for (;;) {
|
|
c = read();
|
|
switch (c) {
|
|
case -1:
|
|
break stateloop;
|
|
case '>':
|
|
state = MetaScanner.DATA;
|
|
continue stateloop;
|
|
case '-':
|
|
continue;
|
|
default:
|
|
state = MetaScanner.COMMENT;
|
|
continue stateloop;
|
|
}
|
|
}
|
|
// XXX reorder point
|
|
case COMMENT_START_DASH:
|
|
c = read();
|
|
switch (c) {
|
|
case -1:
|
|
break stateloop;
|
|
case '-':
|
|
state = MetaScanner.COMMENT_END;
|
|
continue stateloop;
|
|
case '>':
|
|
state = MetaScanner.DATA;
|
|
continue stateloop;
|
|
default:
|
|
state = MetaScanner.COMMENT;
|
|
continue stateloop;
|
|
}
|
|
// XXX reorder point
|
|
case ATTRIBUTE_VALUE_SINGLE_QUOTED:
|
|
for (;;) {
|
|
if (reconsume) {
|
|
reconsume = false;
|
|
} else {
|
|
c = read();
|
|
}
|
|
switch (c) {
|
|
case -1:
|
|
break stateloop;
|
|
case '\'':
|
|
if (tryCharset()) {
|
|
break stateloop;
|
|
}
|
|
state = MetaScanner.AFTER_ATTRIBUTE_VALUE_QUOTED;
|
|
continue stateloop;
|
|
default:
|
|
if (metaState == A && (contentIndex == 6 || charsetIndex == 6)) {
|
|
addToBuffer(c);
|
|
}
|
|
continue;
|
|
}
|
|
}
|
|
// XXX reorder point
|
|
case SCAN_UNTIL_GT:
|
|
for (;;) {
|
|
if (reconsume) {
|
|
reconsume = false;
|
|
} else {
|
|
c = read();
|
|
}
|
|
switch (c) {
|
|
case -1:
|
|
break stateloop;
|
|
case '>':
|
|
state = MetaScanner.DATA;
|
|
continue stateloop;
|
|
default:
|
|
continue;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
stateSave = state;
|
|
}
|
|
|
|
/**
|
|
* Adds a character to the accumulation buffer.
|
|
* @param c the character to add
|
|
*/
|
|
private void addToBuffer(int c) {
|
|
if (strBufLen == strBuf.length) {
|
|
char[] newBuf = new char[strBuf.length + (strBuf.length << 1)];
|
|
System.arraycopy(strBuf, 0, newBuf, 0, strBuf.length);
|
|
strBuf = newBuf;
|
|
}
|
|
strBuf[strBufLen++] = (char)c;
|
|
}
|
|
|
|
/**
|
|
* Attempts to extract a charset name from the accumulation buffer.
|
|
* @return <code>true</code> if successful
|
|
* @throws SAXException
|
|
*/
|
|
private boolean tryCharset() throws SAXException {
|
|
if (metaState != A || !(contentIndex == 6 || charsetIndex == 6)) {
|
|
return false;
|
|
}
|
|
String attVal = Portability.newStringFromBuffer(strBuf, 0, strBufLen);
|
|
String candidateEncoding;
|
|
if (contentIndex == 6) {
|
|
candidateEncoding = TreeBuilder.extractCharsetFromContent(attVal);
|
|
Portability.releaseString(attVal);
|
|
} else {
|
|
candidateEncoding = attVal;
|
|
}
|
|
if (candidateEncoding == null) {
|
|
return false;
|
|
}
|
|
boolean success = tryCharset(candidateEncoding);
|
|
Portability.releaseString(candidateEncoding);
|
|
contentIndex = -1;
|
|
charsetIndex = -1;
|
|
return success;
|
|
}
|
|
|
|
/**
|
|
* Tries to switch to an encoding.
|
|
*
|
|
* @param encoding
|
|
* @return <code>true</code> if successful
|
|
* @throws SAXException
|
|
*/
|
|
protected abstract boolean tryCharset(String encoding) throws SAXException;
|
|
|
|
|
|
}
|