es6.regexp.replace.js
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'use strict';
var anObject = require('./_an-object');
var toObject = require('./_to-object');
var toLength = require('./_to-length');
var toInteger = require('./_to-integer');
var advanceStringIndex = require('./_advance-string-index');
var regExpExec = require('./_regexp-exec-abstract');
var max = Math.max;
var min = Math.min;
var floor = Math.floor;
var SUBSTITUTION_SYMBOLS = /\$([$&`']|\d\d?|<[^>]*>)/g;
var SUBSTITUTION_SYMBOLS_NO_NAMED = /\$([$&`']|\d\d?)/g;
var maybeToString = function (it) {
return it === undefined ? it : String(it);
};
// @@replace logic
require('./_fix-re-wks')('replace', 2, function (defined, REPLACE, $replace, maybeCallNative) {
return [
// `String.prototype.replace` method
// https://tc39.github.io/ecma262/#sec-string.prototype.replace
function replace(searchValue, replaceValue) {
var O = defined(this);
var fn = searchValue == undefined ? undefined : searchValue[REPLACE];
return fn !== undefined
? fn.call(searchValue, O, replaceValue)
: $replace.call(String(O), searchValue, replaceValue);
},
// `RegExp.prototype[@@replace]` method
// https://tc39.github.io/ecma262/#sec-regexp.prototype-@@replace
function (regexp, replaceValue) {
var res = maybeCallNative($replace, regexp, this, replaceValue);
if (res.done) return res.value;
var rx = anObject(regexp);
var S = String(this);
var functionalReplace = typeof replaceValue === 'function';
if (!functionalReplace) replaceValue = String(replaceValue);
var global = rx.global;
if (global) {
var fullUnicode = rx.unicode;
rx.lastIndex = 0;
}
var results = [];
while (true) {
var result = regExpExec(rx, S);
if (result === null) break;
results.push(result);
if (!global) break;
var matchStr = String(result[0]);
if (matchStr === '') rx.lastIndex = advanceStringIndex(S, toLength(rx.lastIndex), fullUnicode);
}
var accumulatedResult = '';
var nextSourcePosition = 0;
for (var i = 0; i < results.length; i++) {
result = results[i];
var matched = String(result[0]);
var position = max(min(toInteger(result.index), S.length), 0);
var captures = [];
// NOTE: This is equivalent to
// captures = result.slice(1).map(maybeToString)
// but for some reason `nativeSlice.call(result, 1, result.length)` (called in
// the slice polyfill when slicing native arrays) "doesn't work" in safari 9 and
// causes a crash (https://pastebin.com/N21QzeQA) when trying to debug it.
for (var j = 1; j < result.length; j++) captures.push(maybeToString(result[j]));
var namedCaptures = result.groups;
if (functionalReplace) {
var replacerArgs = [matched].concat(captures, position, S);
if (namedCaptures !== undefined) replacerArgs.push(namedCaptures);
var replacement = String(replaceValue.apply(undefined, replacerArgs));
} else {
replacement = getSubstitution(matched, S, position, captures, namedCaptures, replaceValue);
}
if (position >= nextSourcePosition) {
accumulatedResult += S.slice(nextSourcePosition, position) + replacement;
nextSourcePosition = position + matched.length;
}
}
return accumulatedResult + S.slice(nextSourcePosition);
}
];
// https://tc39.github.io/ecma262/#sec-getsubstitution
function getSubstitution(matched, str, position, captures, namedCaptures, replacement) {
var tailPos = position + matched.length;
var m = captures.length;
var symbols = SUBSTITUTION_SYMBOLS_NO_NAMED;
if (namedCaptures !== undefined) {
namedCaptures = toObject(namedCaptures);
symbols = SUBSTITUTION_SYMBOLS;
}
return $replace.call(replacement, symbols, function (match, ch) {
var capture;
switch (ch.charAt(0)) {
case '$': return '$';
case '&': return matched;
case '`': return str.slice(0, position);
case "'": return str.slice(tailPos);
case '<':
capture = namedCaptures[ch.slice(1, -1)];
break;
default: // \d\d?
var n = +ch;
if (n === 0) return match;
if (n > m) {
var f = floor(n / 10);
if (f === 0) return match;
if (f <= m) return captures[f - 1] === undefined ? ch.charAt(1) : captures[f - 1] + ch.charAt(1);
return match;
}
capture = captures[n - 1];
}
return capture === undefined ? '' : capture;
});
}
});