1 files changed, 92 insertions, 0 deletions
diff --git a/webAO/encoding.js b/webAO/encoding.js
new file mode 100644
index 0000000..71ebe53
--- /dev/null
+++ b/webAO/encoding.js
@@ -0,0 +1,92 @@
+/**
+ * Escapes a string to AO1 escape codes.
+ * @param {string} estring the string to be escaped
+ */
+export function escapeChat(estring) {
+	return estring
+		.replace(/#/g, "<num>")
+		.replace(/&/g, "<and>")
+		.replace(/%/g, "<percent>")
+		.replace(/\$/g, "<dollar>");
+}
+
+/**
+ * Unescapes a string to AO1 escape codes.
+ * @param {string} estring the string to be unescaped
+ */
+export function unescapeChat(estring) {
+	return estring
+		.replace(/<num>/g, "#")
+		.replace(/<and>/g, "&")
+		.replace(/<percent>/g, "%")
+		.replace(/<dollar>/g, "$");
+}
+
+/**
+ * Escapes a string to be HTML-safe.
+ * 
+ * XXX: This is unnecessary if we use `createTextNode` instead!
+ * @param {string} unsafe an unsanitized string
+ */
+export function safe_tags(unsafe) {
+	if (unsafe) {
+		return unsafe
+			.replace(/>/g, "&rt;")
+			.replace(/</g, "&lt;");
+	} else {
+		return "";
+	}
+}
+
+/**
+ * Encode text on client side.
+ * @param {string} estring the string to be encoded
+ */
+export function encodeChat(estring) {
+	const selectedEncoding = document.getElementById("client_encoding").value;
+	if (selectedEncoding === "unicode") {
+		// This approach works by escaping all special characters to Unicode escape sequences.
+		// Source: https://gist.github.com/mathiasbynens/1243213
+		return estring.replace(/[^\0-~]/g, function (ch) {
+			return "\\u" + ("000" + ch.charCodeAt().toString(16)).slice(-4);
+		});
+	} else if (selectedEncoding === "utf16") {
+		// Source: https://developers.google.com/web/updates/2012/06/How-to-convert-ArrayBuffer-to-and-from-String
+		const buffer = new ArrayBuffer(estring.length * 2);
+		const result = new Uint16Array(buffer);
+		for (let i = 0, strLen = estring.length; i < strLen; i++) {
+			result[i] = estring.charCodeAt(i);
+		}
+		return String(result);
+	} else {
+		return estring;
+	}
+}
+
+/**
+ * Decodes text on client side.
+ * @param {string} estring the string to be decoded
+ */
+export function decodeChat(estring) {
+	const selectedDecoding = document.getElementById("client_decoding").value;
+	if (selectedDecoding === "unicode") {
+		// Source: https://stackoverflow.com/questions/7885096/how-do-i-decode-a-string-with-escaped-unicode
+		return estring.replace(/\\u([\d\w]{1,})/gi, function (match, group) {
+			return String.fromCharCode(parseInt(group, 16));
+		});
+	} else if (selectedDecoding === "utf16") {
+		// Source: https://developers.google.com/web/updates/2012/06/How-to-convert-ArrayBuffer-to-and-from-String
+		return String.fromCharCode.apply(null, new Uint16Array(estring.split(",")));
+	} else {
+		return estring;
+	}
+}
+
+/**
+ * XXX: a nasty hack made by gameboyprinter.
+ * @param {string} msg chat message to prepare for display 
+ */
+export function prepChat(msg) {
+	// TODO: make this less awful
+	return unescapeChat(decodeChat(msg));
+}
+\ No newline at end of file