org.htmlunit.cyberneko.HTMLUnicodeEntitiesParser Maven / Gradle / Ivy
/*
* Copyright (c) 2002-2009 Andy Clark, Marc Guillemot
* Copyright (c) 2017-2024 Ronald Brill
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.htmlunit.cyberneko;
/**
* Parser for the Pre-defined named HTML entities.
* 12.2.5.72 Character reference state
*
* From the spec:
* Consume the maximum number of characters possible, with the consumed characters matching
* one of the identifiers in the first column of the named character references table
* (in a case-sensitive manner).
* Append each character to the temporary buffer when it's consumed.
*
* @author Ronald Brill
*/
public class HTMLUnicodeEntitiesParser {
public static final int STATE_START = 0;
private static final int STATE_HEXADECIMAL_CHAR = -102;
private static final int STATE_DECIMAL_CHAR = -104;
private static final int STATE_HEXADECIMAL_START = -103;
private static final int STATE_NUMERIC_CHAR_END_SEMICOLON_MISSING = -105;
private static final int STATE_ABSENCE_OF_DIGITS_IN_NUMERIC_CHARACTER_REFERENCE = -106;
private int state_;
private int consumedCount_;
private String match_;
private int code_;
private int matchLength_;
public String getMatch() {
return match_;
}
public int getRewindCount() {
return consumedCount_ - matchLength_;
}
public HTMLUnicodeEntitiesParser() {
state_ = STATE_START;
}
public void setMatchFromCode() {
// If the number is 0x00, then this is a null-character-reference parse error. Set the character reference code to 0xFFFD.
// If the number is greater than 0x10FFFF, then this is a character-reference-outside-unicode-range parse error. Set the character reference code to 0xFFFD.
if ((0x00 == code_) || (code_ > 0x10FFFF)) {
match_ = "\uFFFD";
matchLength_ = consumedCount_;
return;
}
// If the number is a surrogate, then this is a surrogate-character-reference parse error. Set the character reference code to 0xFFFD
if (Character.isSurrogate((char) code_)) {
match_ = "\uFFFD";
return;
}
// If the number is a noncharacter, then this is a noncharacter-character-reference parse error.
// If the number is 0x0D, or a control that's not ASCII whitespace, then this is a control-character-reference parse error.
// If the number is one of the numbers in the first column of the following table, then find the row with that number in the first column,
// and set the character reference code to the number in the second column of that row.
switch (code_) {
case 0x80:
match_ = "\u20AC";
matchLength_ = consumedCount_;
return;
case 0x82:
match_ = "\u201A";
matchLength_ = consumedCount_;
return;
case 0x83:
match_ = "\u0192";
matchLength_ = consumedCount_;
return;
case 0x84:
match_ = "\u201E";
matchLength_ = consumedCount_;
return;
case 0x85:
match_ = "\u2026";
matchLength_ = consumedCount_;
return;
case 0x86:
match_ = "\u2020";
matchLength_ = consumedCount_;
return;
case 0x87:
match_ = "\u2021";
matchLength_ = consumedCount_;
return;
case 0x88:
match_ = "\u02C6";
matchLength_ = consumedCount_;
return;
case 0x89:
match_ = "\u2030";
matchLength_ = consumedCount_;
return;
case 0x8A:
match_ = "\u0160";
matchLength_ = consumedCount_;
return;
case 0x8B:
match_ = "\u2039";
matchLength_ = consumedCount_;
return;
case 0x8C:
match_ = "\u0152";
matchLength_ = consumedCount_;
return;
case 0x8E:
match_ = "\u017D";
matchLength_ = consumedCount_;
return;
case 0x91:
match_ = "\u2018";
matchLength_ = consumedCount_;
return;
case 0x92:
match_ = "\u2019";
matchLength_ = consumedCount_;
return;
case 0x93:
match_ = "\u201C";
matchLength_ = consumedCount_;
return;
case 0x94:
match_ = "\u201D";
matchLength_ = consumedCount_;
return;
case 0x95:
match_ = "\u2022";
matchLength_ = consumedCount_;
return;
case 0x96:
match_ = "\u2013";
matchLength_ = consumedCount_;
return;
case 0x97:
match_ = "\u2014";
matchLength_ = consumedCount_;
return;
case 0x98:
match_ = "\u20DC";
matchLength_ = consumedCount_;
return;
case 0x99:
match_ = "\u2122";
matchLength_ = consumedCount_;
return;
case 0x9A:
match_ = "\u0161";
matchLength_ = consumedCount_;
return;
case 0x9B:
match_ = "\u203A";
matchLength_ = consumedCount_;
return;
case 0x9C:
match_ = "\u0153";
matchLength_ = consumedCount_;
return;
case 0x9E:
match_ = "\u017E";
matchLength_ = consumedCount_;
return;
case 0x9F:
match_ = "\u0178";
matchLength_ = consumedCount_;
return;
default:
break;
}
match_ = new String(Character.toChars(code_));
matchLength_ = consumedCount_;
}
/**
* Parses a numeric entity such as #x64; or #42; The
* ampersand must not be presented.
*
* @param current the next character to check
*
* @return if we have reached the end of the parsing
*/
public boolean parseNumeric(final int current) {
consumedCount_++;
switch (state_) {
case STATE_START:
if ('X' == current || 'x' == current) {
// spec suggests a HEX START state
// 13.2.5.76 Hexadecimal character reference start state
state_ = STATE_HEXADECIMAL_START;
code_ = 0;
return true;
}
if ('0' <= current && current <= '9') {
state_ = STATE_DECIMAL_CHAR;
code_ = (code_ * 10) + current - 0x30;
return true;
}
break;
case STATE_HEXADECIMAL_START:
// this block addresses &#x and &#x; cases
// Ideally we would just change state and reconsume,
// but the parser impl does not permit that, hence
// some duplicate code here
if ('0' <= current && current <= '9') {
state_ = STATE_HEXADECIMAL_CHAR;
code_ = (code_ * 16) + current - 0x30;
return true;
}
if ('A' <= current && current <= 'F') {
state_ = STATE_HEXADECIMAL_CHAR;
code_ = (code_ * 16) + current - 0x37;
return true;
}
if ('a' <= current && current <= 'f') {
state_ = STATE_HEXADECIMAL_CHAR;
code_ = (code_ * 16) + current - 0x57;
return true;
}
state_ = STATE_ABSENCE_OF_DIGITS_IN_NUMERIC_CHARACTER_REFERENCE;
break;
case STATE_HEXADECIMAL_CHAR:
if ('0' <= current && current <= '9') {
code_ = (code_ * 16) + current - 0x30;
return true;
}
if ('A' <= current && current <= 'F') {
code_ = (code_ * 16) + current - 0x37;
return true;
}
if ('a' <= current && current <= 'f') {
code_ = (code_ * 16) + current - 0x57;
return true;
}
if (';' == current) {
setMatchFromCode();
return false;
}
state_ = STATE_NUMERIC_CHAR_END_SEMICOLON_MISSING;
setMatchFromCode();
matchLength_ = consumedCount_ - 1;
break;
case STATE_DECIMAL_CHAR:
if ('0' <= current && current <= '9') {
code_ = (code_ * 10) + current - 0x30;
return true;
}
if (';' == current) {
setMatchFromCode();
return false;
}
state_ = STATE_NUMERIC_CHAR_END_SEMICOLON_MISSING;
setMatchFromCode();
matchLength_ = consumedCount_ - 1;
break;
}
return false;
}
}