1 files changed, 69 insertions, 0 deletions
diff --git a/src/app/js/localize.js b/src/app/js/localize.js
new file mode 100644
index 0000000..6776566
--- /dev/null
+++ b/src/app/js/localize.js
@@ -0,0 +1,69 @@
+// localizes `string`, removing instances of `%%string%%` with
+// `lang("string")` and so forth
+function localize_string(string) {
+	let parts = string.split("%%");
+
+	// basic checks to make sure `string` has lang strings
+	if (parts.length == 0
+		|| string.trim() == "" || ! string.match("%%")) {
+		return string;
+	}
+
+	for (let i = 0; i < parts.length; i++) {
+		// simply checks to make sure it is actually a lang string.
+		if (parts[i][0] != " " && 
+			parts[i][parts[i].length - 1] != " ") {
+
+			// get string
+			let lang_str = lang(parts[i]);
+
+			// make sure we got a string back, and if not, do nothing
+			if (typeof lang_str !== "string") {
+				continue;
+			}
+
+			// replace this part with the lang string
+			parts[i] = lang_str;
+		}
+	}
+
+	// return finalized formatted string
+	return parts.join("");
+}
+
+// runs `localize_string()` on `el`'s attributes, text nodes and children
+function localize_el(el) {
+	// we don't want to mess with script tags
+	if (el.tagName == "SCRIPT") {return}
+
+	let attributes = el.getAttributeNames();
+
+	// run through child nodes
+	for (let i = 0; i < el.childNodes.length; i++) {
+		// if the node isn't a text node, we do nothing
+		if (el.childNodes[i].nodeType != Node.TEXT_NODE) {
+			continue;
+		}
+
+		// the node is a text node, so we set its `.textContent` by
+		// running `format_string()` on it
+		el.childNodes[i].textContent =
+			localize_string(el.childNodes[i].textContent)
+	}
+
+	// run through attributes and run `format_string()` on their values
+	for (let i = 0; i < attributes.length; i++) {
+		let attr = el.getAttribute(attributes[i]);
+		el.setAttribute(attributes[i], localize_string(attr))
+	}
+
+	// run `replace_in_el()` on `el`'s children
+	for (let i = 0; i < el.children.length; i++) {
+		localize_el(el.children[i]);
+	}
+}
+
+// localizes lang strings on (almost) all the elements inside `<body>`
+module.exports = () => {
+	localize_el(document.body);
+}