Initial commit

node_modules/unpack-string/lib/unpack-string.js

@@ -0,0 +1,61 @@
+'use strict';
+
+/**
+ * Unpacks the content found within a text, delimited by an opening char and a closing char, e.g., "Can extract (only the content found here within these parentheses)"
+ * @param  {String} str         Input String
+ * @param  {String} openingChar Opening char e.g. "(", "[", "{". If nothing is passed in it will try to guess some known opening chars: '([{<'
+ * @param  {String} closingChar Closing char e.g. ")", "]", "}". If nothing is passed in it will try to guess some known closing chars: ')]}>'
+ * @return {String}             The content found within the opening char and the closing char
+ */
+function unpackString(str, openingChar, closingChar) {
+
+	let knownOpeningChars = '([{<';
+	let knownClosingChars = ')]}>';
+
+	let indexStart;
+	let indexEnd;
+	let skip = 0;
+
+	for (let i = 0; i < str.length; i++) {
+		const char = str[i];
+
+		if (!openingChar) {
+			if (knownOpeningChars.indexOf(char) < 0) {
+				continue;
+			}
+
+			openingChar = char;
+		}
+
+		closingChar = closingChar || knownClosingChars[knownOpeningChars.indexOf(openingChar)];
+
+		let matchOpeningChar = char === openingChar;
+		let matchClosingChar = char === closingChar;
+
+		if (typeof(indexStart) === 'undefined' && matchOpeningChar) {
+			indexStart = i;
+			continue;
+		}
+
+		if (matchOpeningChar) {
+			skip += 1;
+			continue;
+		}
+
+		if (skip && matchClosingChar) {
+			skip -= 1;
+			continue;
+		}
+
+		if (matchClosingChar) {
+			indexEnd = i;
+			break;
+		}
+	}
+
+	return str.substring(indexStart + 1, indexEnd);
+}
+
+if (typeof module !== 'undefined' && module.exports) {
+    module.exports = unpackString;
+}