Overview

This problem challenges you to validate the syntax of a simplified programming construct involving multiple types of nested delimiters. You are given a string representing a snippet of "MacroScript" code. The task is to determine if all delimiters are correctly matched, properly nested, and adhere to specific contextual rules for a special "macro block" delimiter. This problem is a classic application of stack data structures for parsing and syntax validation.

What you need to do / Task

Implement a function isValidMacroScript that takes a string s representing a MacroScript snippet. The function should return true if the string has a valid sequence of delimiters according to the rules below, and false otherwise.

The delimiters are:

1. Standard parentheses: ( and )
2. Square brackets: [ and ]
3. Curly braces: { and }
4. Macro block delimiters: | and | (The same character | serves as both opening and closing.)

Rules for validity:

• Every opening delimiter must have a corresponding closing delimiter of the same type.
• Opening delimiters must be closed in the correct order (i.e., they must be properly nested).
• Special Rule for Macro Blocks: A macro block |...| can only contain standard parentheses () and square brackets []. It cannot contain curly braces {}. If a curly brace { or } is encountered within a |...| block, the string is invalid.
• Other characters (non-delimiter characters) in the input string should be ignored for validation purposes.

Input & output

Input: s: A string consisting of various characters, including the specified delimiters.

Output: boolean: true if the input string s is valid according to the rules, false otherwise.

Function Signature (TypeScript):

function isValidMacroScript(s: string): boolean

Function Signature (JavaScript):

function isValidMacroScript(s: string): boolean

Clarifications

• Q: What if the string is empty or contains only non-delimiter characters?
  • A: An empty string or a string with only non-delimiter characters is considered valid.
• Q: How should | be handled if it's not part of a pair?
  • A: A single | character acts as both an opening and a closing delimiter for macro blocks. If you encounter | and the top of the stack is also |, it signifies a closing | for the current macro block. Otherwise, it acts as an opening |.
• Q: Do | characters count as matching if they are not the top of the stack?
  • A: No. Like other delimiters, | must match the most recently opened | (which would be at the top of the stack). For example, (|[]) is invalid because ) is attempting to close |.
• Q: Are there any length limits on the input string?
  • A: Yes, refer to the "Constraints & assumptions" section.