@stream-toolbox/replace/index.js

Replace the given Buffer in a readable stream with another Buffer.

"use strict";
var __extends = (this && this.__extends) || (function () {
    var extendStatics = function (d, b) {
        extendStatics = Object.setPrototypeOf ||
            ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
            function (d, b) { for (var p in b) if (Object.prototype.hasOwnProperty.call(b, p)) d[p] = b[p]; };
        return extendStatics(d, b);
    };
    return function (d, b) {
        if (typeof b !== "function" && b !== null)
            throw new TypeError("Class extends value " + String(b) + " is not a constructor or null");
        extendStatics(d, b);
        function __() { this.constructor = d; }
        d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
    };
})();
var stream_1 = require("stream");
var StreamSearch = require("@stream-toolbox/search");
var StreamReplace = (function (_super) {
    __extends(StreamReplace, _super);
    function StreamReplace(find, replace, limit) {
        var _this = _super.call(this) || this;
        if (typeof find === "string") {
            find = Buffer.from(find, "utf-8");
        }
        if (typeof replace === "string") {
            replace = Buffer.from(replace, "utf-8");
        }
        _this.searcher = new StreamSearch({ needle: find, limit: limit, abandon: false }, function (isMatch, chunk) {
            if (isMatch) {
                _this.push(replace);
            }
            if (chunk.length) {
                _this.push(chunk);
            }
        });
        return _this;
    }
    StreamReplace.prototype._transform = function (chunk, encoding, callback) {
        this.searcher.push(chunk);
        callback(null);
    };
    StreamReplace.prototype._flush = function (callback) {
        this.searcher.flush();
        callback(null);
    };
    return StreamReplace;
}(stream_1.Transform));
module.exports = function createReplace(find, replace, limit) {
    return new StreamReplace(find, replace, limit);
};