318 lines
8.7 KiB
JavaScript
318 lines
8.7 KiB
JavaScript
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// Utilities
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//
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'use strict';
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function _class(obj) { return Object.prototype.toString.call(obj); }
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function isString(obj) { return _class(obj) === '[object String]'; }
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var _hasOwnProperty = Object.prototype.hasOwnProperty;
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function has(object, key) {
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return _hasOwnProperty.call(object, key);
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}
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// Merge objects
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//
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function assign(obj /*from1, from2, from3, ...*/) {
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var sources = Array.prototype.slice.call(arguments, 1);
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sources.forEach(function (source) {
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if (!source) { return; }
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if (typeof source !== 'object') {
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throw new TypeError(source + 'must be object');
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}
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Object.keys(source).forEach(function (key) {
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obj[key] = source[key];
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});
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});
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return obj;
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}
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// Remove element from array and put another array at those position.
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// Useful for some operations with tokens
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function arrayReplaceAt(src, pos, newElements) {
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return [].concat(src.slice(0, pos), newElements, src.slice(pos + 1));
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}
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////////////////////////////////////////////////////////////////////////////////
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function isValidEntityCode(c) {
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/*eslint no-bitwise:0*/
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// broken sequence
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if (c >= 0xD800 && c <= 0xDFFF) { return false; }
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// never used
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if (c >= 0xFDD0 && c <= 0xFDEF) { return false; }
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if ((c & 0xFFFF) === 0xFFFF || (c & 0xFFFF) === 0xFFFE) { return false; }
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// control codes
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if (c >= 0x00 && c <= 0x08) { return false; }
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if (c === 0x0B) { return false; }
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if (c >= 0x0E && c <= 0x1F) { return false; }
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if (c >= 0x7F && c <= 0x9F) { return false; }
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// out of range
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if (c > 0x10FFFF) { return false; }
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return true;
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}
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function fromCodePoint(c) {
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/*eslint no-bitwise:0*/
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if (c > 0xffff) {
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c -= 0x10000;
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var surrogate1 = 0xd800 + (c >> 10),
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surrogate2 = 0xdc00 + (c & 0x3ff);
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return String.fromCharCode(surrogate1, surrogate2);
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}
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return String.fromCharCode(c);
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}
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var UNESCAPE_MD_RE = /\\([!"#$%&'()*+,\-.\/:;<=>?@[\\\]^_`{|}~])/g;
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var ENTITY_RE = /&([a-z#][a-z0-9]{1,31});/gi;
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var UNESCAPE_ALL_RE = new RegExp(UNESCAPE_MD_RE.source + '|' + ENTITY_RE.source, 'gi');
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var DIGITAL_ENTITY_TEST_RE = /^#((?:x[a-f0-9]{1,8}|[0-9]{1,8}))/i;
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var entities = require('./entities');
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function replaceEntityPattern(match, name) {
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var code = 0;
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if (has(entities, name)) {
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return entities[name];
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}
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if (name.charCodeAt(0) === 0x23/* # */ && DIGITAL_ENTITY_TEST_RE.test(name)) {
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code = name[1].toLowerCase() === 'x' ?
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parseInt(name.slice(2), 16) : parseInt(name.slice(1), 10);
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if (isValidEntityCode(code)) {
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return fromCodePoint(code);
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}
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}
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return match;
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}
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/*function replaceEntities(str) {
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if (str.indexOf('&') < 0) { return str; }
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return str.replace(ENTITY_RE, replaceEntityPattern);
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}*/
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function unescapeMd(str) {
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if (str.indexOf('\\') < 0) { return str; }
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return str.replace(UNESCAPE_MD_RE, '$1');
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}
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function unescapeAll(str) {
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if (str.indexOf('\\') < 0 && str.indexOf('&') < 0) { return str; }
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return str.replace(UNESCAPE_ALL_RE, function (match, escaped, entity) {
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if (escaped) { return escaped; }
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return replaceEntityPattern(match, entity);
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});
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}
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////////////////////////////////////////////////////////////////////////////////
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var HTML_ESCAPE_TEST_RE = /[&<>"]/;
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var HTML_ESCAPE_REPLACE_RE = /[&<>"]/g;
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var HTML_REPLACEMENTS = {
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'&': '&',
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'<': '<',
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'>': '>',
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'"': '"'
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};
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function replaceUnsafeChar(ch) {
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return HTML_REPLACEMENTS[ch];
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}
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function escapeHtml(str) {
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if (HTML_ESCAPE_TEST_RE.test(str)) {
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return str.replace(HTML_ESCAPE_REPLACE_RE, replaceUnsafeChar);
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}
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return str;
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}
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////////////////////////////////////////////////////////////////////////////////
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var REGEXP_ESCAPE_RE = /[.?*+^$[\]\\(){}|-]/g;
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function escapeRE(str) {
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return str.replace(REGEXP_ESCAPE_RE, '\\$&');
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}
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////////////////////////////////////////////////////////////////////////////////
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function isSpace(code) {
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switch (code) {
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case 0x09:
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case 0x20:
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return true;
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}
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return false;
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}
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// Zs (unicode class) || [\t\f\v\r\n]
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function isWhiteSpace(code) {
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if (code >= 0x2000 && code <= 0x200A) { return true; }
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switch (code) {
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case 0x09: // \t
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case 0x0A: // \n
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case 0x0B: // \v
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case 0x0C: // \f
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case 0x0D: // \r
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case 0x20:
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case 0xA0:
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case 0x1680:
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case 0x202F:
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case 0x205F:
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case 0x3000:
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return true;
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}
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return false;
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}
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////////////////////////////////////////////////////////////////////////////////
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/*eslint-disable max-len*/
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var UNICODE_PUNCT_RE = require('uc.micro/categories/P/regex');
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// Currently without astral characters support.
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function isPunctChar(ch) {
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return UNICODE_PUNCT_RE.test(ch);
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}
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// Markdown ASCII punctuation characters.
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//
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// !, ", #, $, %, &, ', (, ), *, +, ,, -, ., /, :, ;, <, =, >, ?, @, [, \, ], ^, _, `, {, |, }, or ~
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// http://spec.commonmark.org/0.15/#ascii-punctuation-character
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//
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// Don't confuse with unicode punctuation !!! It lacks some chars in ascii range.
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//
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function isMdAsciiPunct(ch) {
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switch (ch) {
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case 0x21/* ! */:
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case 0x22/* " */:
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case 0x23/* # */:
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case 0x24/* $ */:
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case 0x25/* % */:
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case 0x26/* & */:
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case 0x27/* ' */:
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case 0x28/* ( */:
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case 0x29/* ) */:
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case 0x2A/* * */:
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case 0x2B/* + */:
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case 0x2C/* , */:
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case 0x2D/* - */:
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case 0x2E/* . */:
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case 0x2F/* / */:
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case 0x3A/* : */:
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case 0x3B/* ; */:
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case 0x3C/* < */:
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case 0x3D/* = */:
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case 0x3E/* > */:
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case 0x3F/* ? */:
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case 0x40/* @ */:
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case 0x5B/* [ */:
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case 0x5C/* \ */:
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case 0x5D/* ] */:
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case 0x5E/* ^ */:
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case 0x5F/* _ */:
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case 0x60/* ` */:
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case 0x7B/* { */:
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case 0x7C/* | */:
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case 0x7D/* } */:
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case 0x7E/* ~ */:
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return true;
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default:
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return false;
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}
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}
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// Hepler to unify [reference labels].
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//
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function normalizeReference(str) {
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// Trim and collapse whitespace
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//
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str = str.trim().replace(/\s+/g, ' ');
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// In node v10 'ẞ'.toLowerCase() === 'Ṿ', which is presumed to be a bug
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// fixed in v12 (couldn't find any details).
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//
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// So treat this one as a special case
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// (remove this when node v10 is no longer supported).
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//
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if ('ẞ'.toLowerCase() === 'Ṿ') {
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str = str.replace(/ẞ/g, 'ß');
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}
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// .toLowerCase().toUpperCase() should get rid of all differences
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// between letter variants.
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//
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// Simple .toLowerCase() doesn't normalize 125 code points correctly,
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// and .toUpperCase doesn't normalize 6 of them (list of exceptions:
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// İ, ϴ, ẞ, Ω, K, Å - those are already uppercased, but have differently
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// uppercased versions).
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//
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// Here's an example showing how it happens. Lets take greek letter omega:
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// uppercase U+0398 (Θ), U+03f4 (ϴ) and lowercase U+03b8 (θ), U+03d1 (ϑ)
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//
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// Unicode entries:
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// 0398;GREEK CAPITAL LETTER THETA;Lu;0;L;;;;;N;;;;03B8;
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// 03B8;GREEK SMALL LETTER THETA;Ll;0;L;;;;;N;;;0398;;0398
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// 03D1;GREEK THETA SYMBOL;Ll;0;L;<compat> 03B8;;;;N;GREEK SMALL LETTER SCRIPT THETA;;0398;;0398
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// 03F4;GREEK CAPITAL THETA SYMBOL;Lu;0;L;<compat> 0398;;;;N;;;;03B8;
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//
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// Case-insensitive comparison should treat all of them as equivalent.
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//
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// But .toLowerCase() doesn't change ϑ (it's already lowercase),
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// and .toUpperCase() doesn't change ϴ (already uppercase).
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//
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// Applying first lower then upper case normalizes any character:
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// '\u0398\u03f4\u03b8\u03d1'.toLowerCase().toUpperCase() === '\u0398\u0398\u0398\u0398'
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//
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// Note: this is equivalent to unicode case folding; unicode normalization
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// is a different step that is not required here.
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//
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// Final result should be uppercased, because it's later stored in an object
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// (this avoid a conflict with Object.prototype members,
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// most notably, `__proto__`)
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//
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return str.toLowerCase().toUpperCase();
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}
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////////////////////////////////////////////////////////////////////////////////
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// Re-export libraries commonly used in both markdown-it and its plugins,
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// so plugins won't have to depend on them explicitly, which reduces their
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// bundled size (e.g. a browser build).
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//
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exports.lib = {};
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exports.lib.mdurl = require('mdurl');
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exports.lib.ucmicro = require('uc.micro');
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exports.assign = assign;
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exports.isString = isString;
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exports.has = has;
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exports.unescapeMd = unescapeMd;
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exports.unescapeAll = unescapeAll;
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exports.isValidEntityCode = isValidEntityCode;
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exports.fromCodePoint = fromCodePoint;
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// exports.replaceEntities = replaceEntities;
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exports.escapeHtml = escapeHtml;
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exports.arrayReplaceAt = arrayReplaceAt;
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exports.isSpace = isSpace;
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exports.isWhiteSpace = isWhiteSpace;
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exports.isMdAsciiPunct = isMdAsciiPunct;
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exports.isPunctChar = isPunctChar;
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exports.escapeRE = escapeRE;
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exports.normalizeReference = normalizeReference;
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