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LL1 grammar analysis. Yet another top-down parser generator.

The calculator checks LL1 grammar correctness, parses a text using the grammar, shows FIRST, FOLLOW and FIRST PLUS sets, parsing tree and gives PLANETCALC parsing code.


LL1 parser generator

Extended BNF grammar in ISO/IEC 14977 : 1996(E) form.

Rule names divided by comma, which must be removed.

  • Conversion of fractional numbers between numeral systems

    This online calculator helps to convert fractional number in one numeral system to fractional number in other numeral system.

  • Count the number of words

    The calculator counts word number in a given text. It can be used for rough calculation of translation cost. Can be used for word number calculation in software resources.

  • Email extractor

    This online calculator parses emails from block of text using regular expression

  • GET request string parser

    This parser break GET request string to the parameter-value pairs and decodes URL-encoded sequences, if needed

  • Hill cipher

    This calculator uses Hill cipher to encrypt/decrypt a block of text

  • Huffman coding

    This online calculator generates Huffman encoding for given frequency of occurrence of symbols.

Shannon Entropy

This online calculator computes Shannon entropy for a given event probability table and for a given message


Shannon Entropy

Event probability table

Items per page:

Digits after the decimal point: 2
  • Playfair cipher

    This online calculator encrypts and decrypts a message given Playfair cipher keyword. Non-alphabetic symbols (digits, whitespaces, etc.) are ignored.

  • Regular expression tester

    This online calculator allows user to experiment with regular expressions.

  • Simple math in any numeral system

    This online calculator supports simple math (addition, subtraction, division, multiplication and power) for numbers expressed in any numeral system - binary, octal, hexadecimal, from the base 2 to base 36

  • Symbol frequencies table

    This online calculator builds symbol frequency table for a given message

  • VARIANT DATE to datetime string

    This online calculator converts VARIANT DATE (double) value to datetime string.

  • Vigenère cipher

    Calculator encrypts entered text by using Vigenère cipher. Non-alphabetic symbols (digits, whitespaces, etc.) are not transformed.

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