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Implement HTML file saver - close #9
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,211 @@ | ||
| /* Blob.js | ||
| * A Blob implementation. | ||
| * 2014-07-24 | ||
| * | ||
| * By Eli Grey, http://eligrey.com | ||
| * By Devin Samarin, https://github.com/dsamarin | ||
| * License: MIT | ||
| * See https://github.com/eligrey/Blob.js/blob/master/LICENSE.md | ||
| */ | ||
|
|
||
| /*global self, unescape */ | ||
| /*jslint bitwise: true, regexp: true, confusion: true, es5: true, vars: true, white: true, | ||
| plusplus: true */ | ||
|
|
||
| /*! @source http://purl.eligrey.com/github/Blob.js/blob/master/Blob.js */ | ||
|
|
||
| (function (view) { | ||
| "use strict"; | ||
|
|
||
| view.URL = view.URL || view.webkitURL; | ||
|
|
||
| if (view.Blob && view.URL) { | ||
| try { | ||
| new Blob; | ||
| return; | ||
| } catch (e) {} | ||
| } | ||
|
|
||
| // Internally we use a BlobBuilder implementation to base Blob off of | ||
| // in order to support older browsers that only have BlobBuilder | ||
| var BlobBuilder = view.BlobBuilder || view.WebKitBlobBuilder || view.MozBlobBuilder || (function(view) { | ||
| var | ||
| get_class = function(object) { | ||
| return Object.prototype.toString.call(object).match(/^\[object\s(.*)\]$/)[1]; | ||
| } | ||
| , FakeBlobBuilder = function BlobBuilder() { | ||
| this.data = []; | ||
| } | ||
| , FakeBlob = function Blob(data, type, encoding) { | ||
| this.data = data; | ||
| this.size = data.length; | ||
| this.type = type; | ||
| this.encoding = encoding; | ||
| } | ||
| , FBB_proto = FakeBlobBuilder.prototype | ||
| , FB_proto = FakeBlob.prototype | ||
| , FileReaderSync = view.FileReaderSync | ||
| , FileException = function(type) { | ||
| this.code = this[this.name = type]; | ||
| } | ||
| , file_ex_codes = ( | ||
| "NOT_FOUND_ERR SECURITY_ERR ABORT_ERR NOT_READABLE_ERR ENCODING_ERR " | ||
| + "NO_MODIFICATION_ALLOWED_ERR INVALID_STATE_ERR SYNTAX_ERR" | ||
| ).split(" ") | ||
| , file_ex_code = file_ex_codes.length | ||
| , real_URL = view.URL || view.webkitURL || view | ||
| , real_create_object_URL = real_URL.createObjectURL | ||
| , real_revoke_object_URL = real_URL.revokeObjectURL | ||
| , URL = real_URL | ||
| , btoa = view.btoa | ||
| , atob = view.atob | ||
|
|
||
| , ArrayBuffer = view.ArrayBuffer | ||
| , Uint8Array = view.Uint8Array | ||
|
|
||
| , origin = /^[\w-]+:\/*\[?[\w\.:-]+\]?(?::[0-9]+)?/ | ||
| ; | ||
| FakeBlob.fake = FB_proto.fake = true; | ||
| while (file_ex_code--) { | ||
| FileException.prototype[file_ex_codes[file_ex_code]] = file_ex_code + 1; | ||
| } | ||
| // Polyfill URL | ||
| if (!real_URL.createObjectURL) { | ||
| URL = view.URL = function(uri) { | ||
| var | ||
| uri_info = document.createElementNS("http://www.w3.org/1999/xhtml", "a") | ||
| , uri_origin | ||
| ; | ||
| uri_info.href = uri; | ||
| if (!("origin" in uri_info)) { | ||
| if (uri_info.protocol.toLowerCase() === "data:") { | ||
| uri_info.origin = null; | ||
| } else { | ||
| uri_origin = uri.match(origin); | ||
| uri_info.origin = uri_origin && uri_origin[1]; | ||
| } | ||
| } | ||
| return uri_info; | ||
| }; | ||
| } | ||
| URL.createObjectURL = function(blob) { | ||
| var | ||
| type = blob.type | ||
| , data_URI_header | ||
| ; | ||
| if (type === null) { | ||
| type = "application/octet-stream"; | ||
| } | ||
| if (blob instanceof FakeBlob) { | ||
| data_URI_header = "data:" + type; | ||
| if (blob.encoding === "base64") { | ||
| return data_URI_header + ";base64," + blob.data; | ||
| } else if (blob.encoding === "URI") { | ||
| return data_URI_header + "," + decodeURIComponent(blob.data); | ||
| } if (btoa) { | ||
| return data_URI_header + ";base64," + btoa(blob.data); | ||
| } else { | ||
| return data_URI_header + "," + encodeURIComponent(blob.data); | ||
| } | ||
| } else if (real_create_object_URL) { | ||
| return real_create_object_URL.call(real_URL, blob); | ||
| } | ||
| }; | ||
| URL.revokeObjectURL = function(object_URL) { | ||
| if (object_URL.substring(0, 5) !== "data:" && real_revoke_object_URL) { | ||
| real_revoke_object_URL.call(real_URL, object_URL); | ||
| } | ||
| }; | ||
| FBB_proto.append = function(data/*, endings*/) { | ||
| var bb = this.data; | ||
| // decode data to a binary string | ||
| if (Uint8Array && (data instanceof ArrayBuffer || data instanceof Uint8Array)) { | ||
| var | ||
| str = "" | ||
| , buf = new Uint8Array(data) | ||
| , i = 0 | ||
| , buf_len = buf.length | ||
| ; | ||
| for (; i < buf_len; i++) { | ||
| str += String.fromCharCode(buf[i]); | ||
| } | ||
| bb.push(str); | ||
| } else if (get_class(data) === "Blob" || get_class(data) === "File") { | ||
| if (FileReaderSync) { | ||
| var fr = new FileReaderSync; | ||
| bb.push(fr.readAsBinaryString(data)); | ||
| } else { | ||
| // async FileReader won't work as BlobBuilder is sync | ||
| throw new FileException("NOT_READABLE_ERR"); | ||
| } | ||
| } else if (data instanceof FakeBlob) { | ||
| if (data.encoding === "base64" && atob) { | ||
| bb.push(atob(data.data)); | ||
| } else if (data.encoding === "URI") { | ||
| bb.push(decodeURIComponent(data.data)); | ||
| } else if (data.encoding === "raw") { | ||
| bb.push(data.data); | ||
| } | ||
| } else { | ||
| if (typeof data !== "string") { | ||
| data += ""; // convert unsupported types to strings | ||
| } | ||
| // decode UTF-16 to binary string | ||
| bb.push(unescape(encodeURIComponent(data))); | ||
| } | ||
| }; | ||
| FBB_proto.getBlob = function(type) { | ||
| if (!arguments.length) { | ||
| type = null; | ||
| } | ||
| return new FakeBlob(this.data.join(""), type, "raw"); | ||
| }; | ||
| FBB_proto.toString = function() { | ||
| return "[object BlobBuilder]"; | ||
| }; | ||
| FB_proto.slice = function(start, end, type) { | ||
| var args = arguments.length; | ||
| if (args < 3) { | ||
| type = null; | ||
| } | ||
| return new FakeBlob( | ||
| this.data.slice(start, args > 1 ? end : this.data.length) | ||
| , type | ||
| , this.encoding | ||
| ); | ||
| }; | ||
| FB_proto.toString = function() { | ||
| return "[object Blob]"; | ||
| }; | ||
| FB_proto.close = function() { | ||
| this.size = 0; | ||
| delete this.data; | ||
| }; | ||
| return FakeBlobBuilder; | ||
| }(view)); | ||
|
|
||
| view.Blob = function(blobParts, options) { | ||
| var type = options ? (options.type || "") : ""; | ||
| var builder = new BlobBuilder(); | ||
| if (blobParts) { | ||
| for (var i = 0, len = blobParts.length; i < len; i++) { | ||
| if (Uint8Array && blobParts[i] instanceof Uint8Array) { | ||
| builder.append(blobParts[i].buffer); | ||
| } | ||
| else { | ||
| builder.append(blobParts[i]); | ||
| } | ||
| } | ||
| } | ||
| var blob = builder.getBlob(type); | ||
| if (!blob.slice && blob.webkitSlice) { | ||
| blob.slice = blob.webkitSlice; | ||
| } | ||
| return blob; | ||
| }; | ||
|
|
||
| var getPrototypeOf = Object.getPrototypeOf || function(object) { | ||
| return object.__proto__; | ||
| }; | ||
| view.Blob.prototype = getPrototypeOf(new view.Blob()); | ||
| }(typeof self !== "undefined" && self || typeof window !== "undefined" && window || this.content || this)); |
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