A parser for ALLCOT (15 marks)

Using flex/lex and yacc, write a first parser for the version of ALLCOT without creation of symbol tables. Use the definition of the ALLCOT as stated in Section 3 of The ALLCOT Language document. Extending the language with lists (or arrays) is optional.

The only goal of this parser is to check whether an input text file is a valid ALLCOT program or not. Your parser should report on errors. But, error recovery is not required. So, your parser may halt the parsing after the first error is met.