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// Utilities
//
'use strict';
function _class(obj) { return Object.prototype.toString.call(obj); }
function isString(obj) { return _class(obj) === '[object String]'; }
var _hasOwnProperty = Object.prototype.hasOwnProperty;
function has(object, key) {
return _hasOwnProperty.call(object, key);
}
// Merge objects
//
function assign(obj /*from1, from2, from3, ...*/) {
var sources = Array.prototype.slice.call(arguments, 1);
sources.forEach(function (source) {
if (!source) { return; }
if (typeof source !== 'object') {
throw new TypeError(source + 'must be object');
}
Object.keys(source).forEach(function (key) {
obj[key] = source[key];
});
});
return obj;
}
// Remove element from array and put another array at those position.
// Useful for some operations with tokens
function arrayReplaceAt(src, pos, newElements) {
return [].concat(src.slice(0, pos), newElements, src.slice(pos + 1));
}
////////////////////////////////////////////////////////////////////////////////
var UNESCAPE_MD_RE = /\\([\\!"#$%&'()*+,.\/:;<=>?@[\]^_`{|}~-])/g;
function unescapeMd(str) {
if (str.indexOf('\\') < 0) { return str; }
return str.replace(UNESCAPE_MD_RE, '$1');
}
////////////////////////////////////////////////////////////////////////////////
function isValidEntityCode(c) {
/*eslint no-bitwise:0*/
// broken sequence
if (c >= 0xD800 && c <= 0xDFFF) { return false; }
// never used
if (c >= 0xFDD0 && c <= 0xFDEF) { return false; }
if ((c & 0xFFFF) === 0xFFFF || (c & 0xFFFF) === 0xFFFE) { return false; }
// control codes
if (c >= 0x00 && c <= 0x08) { return false; }
if (c === 0x0B) { return false; }
if (c >= 0x0E && c <= 0x1F) { return false; }
if (c >= 0x7F && c <= 0x9F) { return false; }
// out of range
if (c > 0x10FFFF) { return false; }
return true;
}
function fromCodePoint(c) {
/*eslint no-bitwise:0*/
if (c > 0xffff) {
c -= 0x10000;
var surrogate1 = 0xd800 + (c >> 10),
surrogate2 = 0xdc00 + (c & 0x3ff);
return String.fromCharCode(surrogate1, surrogate2);
}
return String.fromCharCode(c);
}
var NAMED_ENTITY_RE = /&([a-z#][a-z0-9]{1,31});/gi;
var DIGITAL_ENTITY_TEST_RE = /^#((?:x[a-f0-9]{1,8}|[0-9]{1,8}))/i;
var entities = require('./entities');
function replaceEntityPattern(match, name) {
var code = 0;
if (has(entities, name)) {
return entities[name];
} else if (name.charCodeAt(0) === 0x23/* # */ && DIGITAL_ENTITY_TEST_RE.test(name)) {
code = name[1].toLowerCase() === 'x' ?
parseInt(name.slice(2), 16)
:
parseInt(name.slice(1), 10);
if (isValidEntityCode(code)) {
return fromCodePoint(code);
}
}
return match;
}
function replaceEntities(str) {
if (str.indexOf('&') < 0) { return str; }
return str.replace(NAMED_ENTITY_RE, replaceEntityPattern);
}
////////////////////////////////////////////////////////////////////////////////
var HTML_ESCAPE_TEST_RE = /[&<>"]/;
var HTML_ESCAPE_REPLACE_RE = /[&<>"]/g;
var HTML_REPLACEMENTS = {
'&': '&amp;',
'<': '&lt;',
'>': '&gt;',
'"': '&quot;'
};
function replaceUnsafeChar(ch) {
return HTML_REPLACEMENTS[ch];
}
function escapeHtml(str) {
if (HTML_ESCAPE_TEST_RE.test(str)) {
return str.replace(HTML_ESCAPE_REPLACE_RE, replaceUnsafeChar);
}
return str;
}
////////////////////////////////////////////////////////////////////////////////
// Incoming link can be partially encoded. Convert possible combinations to
// unified form.
function normalizeLink(url) {
var normalized = replaceEntities(url);
// We don't care much about result of mailformed URIs,
// but shoud not throw exception.
try {
normalized = decodeURI(normalized);
} catch (__) {}
return encodeURI(normalized);
}
exports.assign = assign;
exports.isString = isString;
exports.has = has;
exports.unescapeMd = unescapeMd;
exports.isValidEntityCode = isValidEntityCode;
exports.fromCodePoint = fromCodePoint;
exports.replaceEntities = replaceEntities;
exports.escapeHtml = escapeHtml;
exports.arrayReplaceAt = arrayReplaceAt;
exports.normalizeLink = normalizeLink;