Initial commit for converting FrankerFaceZ to TypeScript.

src/utilities/path-parser.ts

@@ -0,0 +1,145 @@
+'use strict';
+
+export function parse(path: string) {
+	return parseAST({
+		path,
+		i: 0
+	});
+}
+
+type ParseContext = {
+	path: string;
+	i: number;
+}
+
+export type PathNode = {
+	title: string;
+	key: string;
+	page: boolean;
+	tab: boolean;
+}
+
+function parseAST(ctx: ParseContext) {
+	const path = ctx.path,
+		length = path.length,
+		out = [];
+
+	let token: PathNode | null = null,
+		raw: string | null = null;
+
+	let old_tab = false,
+		old_page = false;
+
+	while ( ctx.i < length ) {
+		const start = ctx.i,
+			char = path[start],
+			next = path[start + 1];
+
+		if ( ! token )
+			token = {} as PathNode;
+
+		if ( ! raw )
+			raw = '';
+
+		// JSON
+		if ( char === '@' && next === '{') {
+			ctx.i++;
+			const tag = parseJSON(ctx);
+			if ( tag )
+				Object.assign(token, tag);
+
+			continue;
+		}
+
+		// Segment End?
+		const tab = char === `~` && next === '>',
+			page = char === '>' && next === '>',
+			segment = ! page && char === '>';
+
+		if ( ! segment && ! page && ! tab ) {
+			raw += char;
+			ctx.i++;
+			continue;
+		}
+
+		// We're at the end of a segment, so push
+		// the token out.
+		if ( tab || page )
+			ctx.i++;
+
+		token.title = raw.trim();
+		token.key = token.title.toSnakeCase();
+
+		token.page = old_page;
+		token.tab = old_tab;
+
+		old_page = page;
+		old_tab = tab;
+
+		out.push(token);
+		token = raw = null;
+		ctx.i++;
+	}
+
+	if ( token && raw ) {
+		token.title = raw.trim();
+		token.key = token.title.toSnakeCase();
+		token.page = old_page;
+		token.tab = old_tab;
+		out.push(token);
+	}
+
+	return out;
+}
+
+function parseJSON(ctx: ParseContext) {
+	const path = ctx.path,
+		length = path.length,
+
+		start = ctx.i;
+
+	ctx.i++;
+
+	const stack = ['{'];
+	let string: string | boolean = false;
+
+	while ( ctx.i < length && stack.length ) {
+		const start = ctx.i,
+			char = path[start];
+
+		if ( string ) {
+			if ( char === '\\' ) {
+				ctx.i++;
+				continue;
+			}
+
+			if ( (char === '"' || char === "'") && char === string ) {
+				stack.pop();
+				string = false;
+			}
+
+		} else {
+			if ( char === '"' || char === "'" ) {
+				string = char;
+				stack.push(char);
+			}
+
+			if ( char === '{' || char === '[' )
+				stack.push(char);
+
+			if ( char === ']' ) {
+				if ( stack.pop() !== '[' )
+					throw new SyntaxError('Invalid JSON');
+			}
+
+			if ( char === '}' ) {
+				if ( stack.pop() !== '{' )
+					throw new SyntaxError('Invalid JSON');
+			}
+		}
+
+		ctx.i++;
+	}
+
+	return JSON.parse(path.slice(start, ctx.i));
+}