Function parseHeredocDelimiter

src/shared/parse-command.ts:145–173

* Parse a heredoc delimiter word starting at position `start` in `command`. * The delimiter may be: * - Unquoted: `EOF` -- bare identifier characters * - Single-quoted: `'EOF'` -- literal body, strip outer quotes * - Double-quoted: `"EOF"` -- expandable body, strip outer quote

(command: string, start: number)

 * of the first character after the delimiter token.
 */
function parseHeredocDelimiter(command: string, start: number): { delimiter: string; endIndex: number } {
	let i = start
	let delimiter = ""

	if (command[i] === "'") {
		i++ // skip opening '
		while (i < command.length && command[i] !== "'" && command[i] !== "\n") {
			delimiter += command[i++]
		}
		if (command[i] === "'") i++ // consume closing '
	} else if (command[i] === '"') {
		i++ // skip opening "
		while (i < command.length && command[i] !== '"' && command[i] !== "\n") {
			delimiter += command[i++]
		}
		if (command[i] === '"') i++ // consume closing "
	} else if (command[i] === "\\") {
		i++ // skip backslash
		while (i < command.length && command[i] !== "\n" && command[i] !== " " && command[i] !== "\t") {
			delimiter += command[i++]
		}
	} else {
		while (i < command.length && command[i] !== "\n" && command[i] !== " " && command[i] !== "\t") {
			delimiter += command[i++]
		}
	}

	return { delimiter, endIndex: i }
}

/**
 * Single shared state-machine walk used by both `findUnterminatedQuote` and