How to Install and Uninstall frown Package on Ubuntu 16.04 LTS (Xenial Xerus)

Last updated: May 17,2024

1. Install "frown" package

This tutorial shows how to install frown on Ubuntu 16.04 LTS (Xenial Xerus)


    
        
            $
        

        
            
                sudo apt update
            
                    
    
    Copied


    
        
            $
        

        
            
                sudo apt install
            
                        
                frown
            
                    
    
    Copied

2. Uninstall "frown" package

Here is a brief guide to show you how to uninstall frown on Ubuntu 16.04 LTS (Xenial Xerus):


    
        
            $
        

        
            
                sudo apt remove
            
                        
                frown
            
                    
    
    Copied


    
        
            $
        

        
            
                sudo apt autoclean && sudo apt autoremove
            
                    
    
    Copied

3. Information about the frown package on Ubuntu 16.04 LTS (Xenial Xerus)

Package: frown
Priority: optional
Section: universe/devel
Installed-Size: 2494
Maintainer: Ubuntu Developers
Original-Maintainer: Debian Haskell Group
Architecture: amd64
Version: 0.6.1-14
Depends: libc6 (>= 2.15), libffi6 (>= 3.0.4), libgmp10
Recommends: frown-doc (= 0.6.1-14)
Filename: pool/universe/f/frown/frown_0.6.1-14_amd64.deb
Size: 574162
MD5sum: 0711b884db63543e50f38482115e4b33
SHA1: 1c296a1f160c3f2dd5df813ee55fd9da4d08ef0e
SHA256: a0b5cbc37cc766d7301491e652adfa8c806ee8766a76f89352a234828550a4eb
Description-en: LALR(k) parser generator for Haskell 98
Frown is inspired by the parser generator Happy and uses a syntax
quite simular as the syntax used by Happy. Happy only handles LALR(1)
grammars while Frown can use more extensive LALR(k) grammars and the
parsers generated by Frown are also faster than the parsers generated
by Happy.
.
The salient features of Frown are:
- The generated parsers are time and space efficient. On the
downside, the parsers are quite large.
- Frown generates four different types of parsers. As a common
characteristic, the parsers are genuinely functional
(ie 'table-free'); the states of the underlying LR automaton are
encoded as mutually recursive functions. Three output formats use
a typed stack representation, one format due to Ross Paterson
(code=stackless) works even without a stack.
- Encoding states as functions means that each state can be treated
individually as opposed to a table driven-approach, which
necessitates a uniform treatment of states. For instance,
look-ahead is only used when necessary to resolve conflicts.
- Frown comes with debugging and tracing facilities; the standard
output format due to Doaitse Swierstra (code=standard) may be
useful for teaching LR parsing.
- Common grammatical patterns such as repetition of symbols can be
captured using rule schemata. There are several predefined rule
schemata.
- Terminal symbols are arbitrary variable-free Haskell patterns or
guards. Both terminal and nonterminal symbols may have an
arbitrary number of synthesized attributes.
- Frown comes with extensive documentation; several example grammars
are included.
.
Furthermore, Frown supports the use of monadic lexers, monadic
semantic actions, precedences and associativity, the generation of
backtracking parsers, multiple start symbols, error reporting and a
weak form of error correction.
Description-md5: 1e5c800f6fc4443e8ac29fc2f890eb80
Bugs: https://bugs.launchpad.net/ubuntu/+filebug
Origin: Ubuntu