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