com.github.rjeschke.txtmark.HTML Maven / Gradle / Ivy
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/*
* Copyright (C) 2011 René Jeschke
*
* 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
*
* http://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 com.github.rjeschke.txtmark;
import java.util.HashMap;
import java.util.HashSet;
/**
* HTML utility class.
*
* @author René Jeschke
*/
class HTML
{
/** List of valid HTML/XML entity names. */
private final static String[] ENTITY_NAMES = {
"Â", "â", "´", "Æ", "æ", "À", "à", "ℵ",
"Α", "α", "&", "∧", "∠", "'", "Å", "å",
"≈", "Ã", "ã", "Ä", "ä", "„", "Β", "β",
"¦", "•", "∩", "Ç", "ç", "¸", "¢", "Χ",
"χ", "ˆ", "♣", "≅", "©", "↵", "∪", "¤",
"‡", "†", "⇓", "↓", "°", "Δ", "δ", "♦",
"÷", "É", "é", "Ê", "ê", "È", "è", "∅",
" ", " ", "Ε", "ε", "≡", "Η", "η", "Ð",
"ð", "Ë", "ë", "€", "∃", "ƒ", "∀", "½",
"¼", "¾", "⁄", "Γ", "γ", "≥", ">", "⇔",
"↔", "♥", "…", "Í", "í", "Î", "î", "¡",
"Ì", "ì", "ℑ", "∞", "∫", "Ι", "ι", "¿",
"∈", "Ï", "ï", "Κ", "κ", "Λ", "λ", "⟨",
"«", "⇐", "←", "⌈", "“", "≤", "⌊", "∗",
"◊", "", "‹", "‘", "<", "¯", "—", "µ",
"·", "−", "Μ", "μ", "∇", " ", "–", "≠",
"∋", "¬", "∉", "⊄", "Ñ", "ñ", "Ν", "ν",
"Ó", "ó", "Ô", "ô", "Œ", "œ", "Ò", "ò",
"‾", "Ω", "ω", "Ο", "ο", "⊕", "∨", "ª",
"º", "Ø", "ø", "Õ", "õ", "⊗", "Ö", "ö",
"¶", "∂", "‰", "⊥", "Φ", "φ", "Π", "π",
"ϖ", "±", "£", "″", "′", "∏", "∝", "Ψ",
"ψ", """, "√", "⟩", "»", "⇒", "→", "⌉",
"”", "ℜ", "®", "⌋", "Ρ", "ρ", "", "›",
"’", "‚", "Š", "š", "⋅", "§", "", "Σ",
"σ", "ς", "∼", "♠", "⊂", "⊆", "∑", "⊃",
"¹", "²", "³", "⊇", "ß", "Τ", "τ", "∴",
"Θ", "θ", "ϑ", " ", "þ", "˜", "×", "™",
"Ú", "ú", "⇑", "↑", "Û", "û", "Ù", "ù",
"¨", "ϒ", "Υ", "υ", "Ü", "ü", "℘", "Ξ",
"ξ", "Ý", "ý", "¥", "Ÿ", "ÿ", "Ζ", "ζ",
"", ""
};
/** Characters corresponding to ENTITY_NAMES. */
private final static char[] ENTITY_CHARS = {
'\u00C2', '\u00E2', '\u00B4', '\u00C6', '\u00E6', '\u00C0', '\u00E0', '\u2135',
'\u0391', '\u03B1', '\u0026', '\u2227', '\u2220', '\'', '\u00C5', '\u00E5',
'\u2248', '\u00C3', '\u00E3', '\u00C4', '\u00E4', '\u201E', '\u0392', '\u03B2',
'\u00A6', '\u2022', '\u2229', '\u00C7', '\u00E7', '\u00B8', '\u00A2', '\u03A7',
'\u03C7', '\u02C6', '\u2663', '\u2245', '\u00A9', '\u21B5', '\u222A', '\u00A4',
'\u2021', '\u2020', '\u21D3', '\u2193', '\u00B0', '\u0394', '\u03B4', '\u2666',
'\u00F7', '\u00C9', '\u00E9', '\u00CA', '\u00EA', '\u00C8', '\u00E8', '\u2205',
'\u2003', '\u2002', '\u0395', '\u03B5', '\u2261', '\u0397', '\u03B7', '\u00D0',
'\u00F0', '\u00CB', '\u00EB', '\u20AC', '\u2203', '\u0192', '\u2200', '\u00BD',
'\u00BC', '\u00BE', '\u2044', '\u0393', '\u03B3', '\u2265', '\u003E', '\u21D4',
'\u2194', '\u2665', '\u2026', '\u00CD', '\u00ED', '\u00CE', '\u00EE', '\u00A1',
'\u00CC', '\u00EC', '\u2111', '\u221E', '\u222B', '\u0399', '\u03B9', '\u00BF',
'\u2208', '\u00CF', '\u00EF', '\u039A', '\u03BA', '\u039B', '\u03BB', '\u2329',
'\u00AB', '\u21D0', '\u2190', '\u2308', '\u201C', '\u2264', '\u230A', '\u2217',
'\u25CA', '\u200E', '\u2039', '\u2018', '\u003C', '\u00AF', '\u2014', '\u00B5',
'\u00B7', '\u2212', '\u039C', '\u03BC', '\u2207', '\u00A0', '\u2013', '\u2260',
'\u220B', '\u00AC', '\u2209', '\u2284', '\u00D1', '\u00F1', '\u039D', '\u03BD',
'\u00D3', '\u00F3', '\u00D4', '\u00F4', '\u0152', '\u0153', '\u00D2', '\u00F2',
'\u203E', '\u03A9', '\u03C9', '\u039F', '\u03BF', '\u2295', '\u2228', '\u00AA',
'\u00BA', '\u00D8', '\u00F8', '\u00D5', '\u00F5', '\u2297', '\u00D6', '\u00F6',
'\u00B6', '\u2202', '\u2030', '\u22A5', '\u03A6', '\u03C6', '\u03A0', '\u03C0',
'\u03D6', '\u00B1', '\u00A3', '\u2033', '\u2032', '\u220F', '\u221D', '\u03A8',
'\u03C8', '\u0022', '\u221A', '\u232A', '\u00BB', '\u21D2', '\u2192', '\u2309',
'\u201D', '\u211C', '\u00AE', '\u230B', '\u03A1', '\u03C1', '\u200F', '\u203A',
'\u2019', '\u201A', '\u0160', '\u0161', '\u22C5', '\u00A7', '\u00AD', '\u03A3',
'\u03C3', '\u03C2', '\u223C', '\u2660', '\u2282', '\u2286', '\u2211', '\u2283',
'\u00B9', '\u00B2', '\u00B3', '\u2287', '\u00DF', '\u03A4', '\u03C4', '\u2234',
'\u0398', '\u03B8', '\u03D1', '\u00DE', '\u00FE', '\u02DC', '\u00D7', '\u2122',
'\u00DA', '\u00FA', '\u21D1', '\u2191', '\u00DB', '\u00FB', '\u00D9', '\u00F9',
'\u00A8', '\u03D2', '\u03A5', '\u03C5', '\u00DC', '\u00FC', '\u2118', '\u039E',
'\u03BE', '\u00DD', '\u00FD', '\u00A5', '\u0178', '\u00FF', '\u0396', '\u03B6',
'\u200D', '\u200C'
};
/** Valid markdown link prefixes for auto links. */
private final static String[] LINK_PREFIXES = {
"http", "https",
"ftp", "ftps"
};
/** HTML block level elements. */
private final static HTMLElement[] BLOCK_ELEMENTS = {
HTMLElement.address,
HTMLElement.blockquote,
HTMLElement.del, HTMLElement.div, HTMLElement.dl,
HTMLElement.fieldset, HTMLElement.form,
HTMLElement.h1, HTMLElement.h2, HTMLElement.h3, HTMLElement.h4, HTMLElement.h5, HTMLElement.h6, HTMLElement.hr,
HTMLElement.ins,
HTMLElement.noscript,
HTMLElement.ol,
HTMLElement.p, HTMLElement.pre,
HTMLElement.table,
HTMLElement.ul
};
/** HTML unsafe elements. */
private final static HTMLElement[] UNSAFE_ELEMENTS = {
HTMLElement.applet,
HTMLElement.head,
HTMLElement.html,
HTMLElement.body,
HTMLElement.frame,
HTMLElement.frameset,
HTMLElement.iframe,
HTMLElement.script,
HTMLElement.object,
};
/** Character to entity encoding map. */
private final static HashMap encodeMap = new HashMap();
/** Entity to character decoding map. */
private final static HashMap decodeMap = new HashMap();
/** Set of valid HTML tags. */
private final static HashSet HTML_ELEMENTS = new HashSet();
/** Set of unsafe HTML tags. */
private final static HashSet HTML_UNSAFE = new HashSet();
/** Set of HTML block level tags. */
private final static HashSet HTML_BLOCK_ELEMENTS = new HashSet();
/** Set of valid markdown link prefixes. */
private final static HashSet LINK_PREFIX = new HashSet();
static
{
for(final HTMLElement h : HTMLElement.values())
{
HTML_ELEMENTS.add(h.toString());
}
for(final HTMLElement h : UNSAFE_ELEMENTS)
{
HTML_UNSAFE.add(h.toString());
}
for(final HTMLElement h : BLOCK_ELEMENTS)
{
HTML_BLOCK_ELEMENTS.add(h.toString());
}
for(int i = 0; i < ENTITY_NAMES.length; i++)
{
encodeMap.put(ENTITY_CHARS[i], ENTITY_NAMES[i]);
decodeMap.put(ENTITY_NAMES[i], ENTITY_CHARS[i]);
}
for(int i = 0; i < LINK_PREFIXES.length; i++)
{
LINK_PREFIX.add(LINK_PREFIXES[i]);
}
}
/** Constructor. (Singleton) */
private HTML()
{
//
}
/**
* @param value String to check.
* @return Returns true if the given String is a link prefix.
*/
public final static boolean isLinkPrefix(final String value)
{
return LINK_PREFIX.contains(value);
}
/**
* @param value String to check.
* @return Returns true if the given String is an entity.
*/
public final static boolean isEntity(final String value)
{
return decodeMap.containsKey(value);
}
/**
* @param value String to check.
* @return Returns true if the given String is a HTML tag.
*/
public final static boolean isHtmlElement(final String value)
{
return HTML_ELEMENTS.contains(value);
}
/**
* @param value String to check.
* @return Returns true if the given String is a HTML block level tag.
*/
public final static boolean isHtmlBlockElement(final String value)
{
return HTML_BLOCK_ELEMENTS.contains(value);
}
/**
* @param value String to check.
* @return Returns true if the given String is an unsafe HTML tag.
*/
public final static boolean isUnsafeHtmlElement(final String value)
{
return HTML_UNSAFE.contains(value);
}
}
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