viethung7899 / functional-parser

A different approach for parsers by using functions and combinators

Functional Parsers

This is my first take of trying functional programming with Haskell

Seriously, it is very hard to grasp all the concept of this programming paradigm. However, I really enjoyed about this languages

How to use

• Install ghc and ghci in the machine
• Clone this repository
• Run ghci <hs_file>
• All parsing statement start with parse

What in this repository?

Parser.hs

A general parser for any type of String

Example: parse character and string

*Parser> parse (char 'a') "abc"
Just ('a',"bc")

*Parser> parse (string "foo") "foobar"
Just ("foo","bar")

JsonParser.hs

A parser spacialized for JSON string

The grammar of JSON can be found here

Example

*JsonParser> parse jsonObject  "{ \"hello\"   : 123, \"foo\": \"bar bar\"}  gssgs"
Just (JsonObject [("hello",JsonNumber 123),("foo",JsonString "bar bar")],"  gssgs")

To-do

• Add IO
• Parse floating numbers for JSON
• Implement ParserError
• Add test
  • Parser
  • JsonParser
• More parser such as HTML, CSS, math expression