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re2dfa
DISCONTINUED. Transform regular expressions into finite state machines and output Go source code. This repository has migrated to https://gitlab.com/opennota/re2dfa
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README
Hasgo
 Coverage status: gocover.io
 Our report card:
Hasgo is a code generator with functions influenced by Haskell.
It comes with some types outofthebox so you can start using it without running the generator.
Specifically you can start using Hasgo's Strings
and Ints
types.
We want to focus on being:
 Immutable
 StronglyTyped (no
interface{}
)  Nilsafe
Pie
The inspiration for Hasgo, as well as some ideas around implementation come from the lovely Pie library, made by Elliot Chance. It's safe to say that Hasgo would not exist without Pie. However, the way Pie and Hasgo work is not the same and neither is the focus of the project. If you don't find a function in Hasgo, check out Pie! :smiley:
Example
import . "github.com/DylanMeeus/hasgo/types"
func EpicFunction() {
// create a range of 10 > 10. Take the absolute values, keep only even numbers, and sum them.
result := IntRange(10,10).
Abs().
Filter(func(i int64) bool {
return i % 2 == 0
}).
Sum()
// result = 60
}
You can find more examples here.
Installation
go get u github.com/DylanMeeus/hasgo
Or add hasgo to your go.mod
file.
require github.com/DylanMeeus/hasgo/v1.0.2
Types
Ints
([]int64)Strings
([]string)
Functions
These are the function currently available with Hasgo. It shows you which type of data they operate on as well as the Haskell type definition. The first symbol of the signature is actually the method receiver in Go terms.
Alternatively, you can consult the godoc
Generic functions
These functions can be generated for every type.
Function  Signature  String  Number  Struct  Description 

Abs 
[a] > [a] 
โ  Return a slice containing the absolute values  
All 
[a] > (a > bool) > bool 
โ  โ  โ  Returns true if the predicate applies to all elements in the slice 
Any 
[a] > (a > bool) > bool 
โ  โ  โ  Returns true if one or more elements satisfy the predicate 
Average 
[a] > a 
โ  Returns the average of all elements  
Break 
(a > bool) > [a] > ([a], [a]) 
โ  โ  โ  Returns a tuple of all elements until the first one that matches the predicate, followed by the remaining elements. 
Delete 
[a] > a > [a] 
โ  โ  โ  Returns the slice with the first occurance of the element deleted. 
Drop 
Int > [a] > [a] 
โ  โ  โ  Returns the suffix of xs after the first n elements. 
DropWhile 
(a > bool) > [a] > [a] 
โ  โ  โ  Returns the suffix of xs after the predicate's first failure. 
Elem 
[a] > a > bool 
โ  โ  โ  Returns true if the slice contains the element. 
Filter 
[a] > (a > bool) > [a] 
โ  โ  โ  Filter the slice based on a predicate 
Foldl 
[a] > a > (a > a > a) > a 
โ  โ  โ  Left fold over the slice to reduce it to one element with starting value. 
Foldl1 
[a] > (a > a > a) > a 
โ  โ  โ  Left fold over the slice to reduce it to one element. 
Foldr 
[a] > b > (a > b > b) > b 
โ  โ  โ  Right fold over the slice to reduce it to one element with a starting value. 
Foldr1 
[a] > (a > a > a) > a 
โ  โ  โ  Right fold over the slice to reduce it to one element. 
Group 
[a] > [[a]] 
โ  โ  โ  Returns a list of lists where each list contains grouped values from the input list. 
Head 
[a] > a 
โ  โ  โ  Return the first element 
Init 
[a] > [a] 
โ  โ  โ  Returns all elements minus the last 
Inits 
[a] > [[a]] 
โ  โ  โ  Returns all initial segments of the slice, shortest first. 
Intercalate 
[a] > [[a]] > [a] 
โ  โ  โ  Intersperses the slice in between the provided 2dslice 
Intersperse 
[a] > a > [a] 
โ  โ  โ  Intersperses the value in between all elements of the provided slice 
IsPrefixOf 
[a] > [a] > bool 
โ  โ  โ  Returns true if the current slice is a prefix of the provided slice 
Last 
[a] > a 
โ  โ  โ  Returns the last element 
Length 
[a] > int 
โ  โ  โ  Returns the length of the slice 
Map 
[a] > (a > a) > [a] 
โ  โ  โ  Returns a slice with the function applied to each element of the input 
Maximum 
[a] > a 
โ  Returns the largest element  
MaximumBy 
[a] > (a > a) > a > a 
โ  โ  โ  Returns the maximum element according to comparator 
Minimum 
[a] > a 
โ  Returns the lowest element  
Modes 
[a] > [a] 
โ  โ  โ  Returns the elements with the highest frequency 
Nub 
[a] > [a] 
โ  โ  โ  Returns a Slice containing one of each of the input elements 
Null 
[a] > bool 
โ  โ  โ  Returns true if the slice is empty, false otherwise 
Product 
[a] > a 
โ  Returns the product of all elements in the slice.  
Reverse 
[a] > [a] 
โ  โ  โ  Returns a slice with the elements reversed 
Scanl 
[a] > b > (a > b > a) > [b] 
โ  โ  โ  Left fold over the slice to reduce it to one element with a starting value and return every iteration in a slice. 
Sort 
[a] > [a] 
โ  โ  Returns a sorted slice (original remains unsorted)  
Span 
(a > bool) > [a] > ([a], [a]) 
โ  โ  โ  Returns a tuple of all elements until the first one that does not match the predicate, followed by the remaining elements. 
SplitAt 
Int > [a] > ([a], [a]) 
โ  โ  โ  Returns a tuple with all elements up until the specified index, followed by the elements after the index. 
Sum 
[a] > a 
โ  โ  โ  The sum of elements in the slice 
Tail 
[a] > [a] 
โ  โ  โ  Returns all elements minus the first 
Tails 
[a] > [[a]] 
โ  โ  โ  Returns all final segments of the slice, longest first. 
Take 
[a] > uint64 > [a] 
โ  โ  โ  Take N elements from the slice, or all if N exceeds the length. 
TakeWhile 
[a] > (a > bool) > [a] 
โ  โ  โ  Take all elements until the first one that does not match the predicate. 
Uncons 
[a] > (a, [a]) 
โ  โ  โ  Returns a tuple of the head and tail of the slice 
Unlines 
[a] > string 
โ  โ  โ  Returns a newline separated string of all elements in the slice 
Unwords 
[a] > string 
โ  โ  โ  Returns a spaceseparated string of all elements in the slice 
Hardcoded functions
The builtin types (Strings, Ints, Bools) have some functions defined on them that are not generated. Mostly because we could not create them in a generic way.
Type  Function  Signature  Description 

Ints 
Equals 
*Ints > Ints > bool 
Returns true if both slices contain the same elements 
Ints 
EqualsOrdered 
*Ints > Ints > bool 
Returns true if both slices contain the same elements, in the same position 
Ints 
IntRange 
int64 > int64 > Ints 
Return an integer range from [start,stop] 
Ints 
IntReplicate 
uint64 > int64 > Ints 
Return a slice with the input element repeated n times 
Strings 
Equals 
*Strings > Strings > bool 
Returns true if both slices contain the same elements 
Strings 
EqualsOrdered 
*Strings > Strings > bool 
Returns true if both slices contain the same elements, in the same position 
Strings 
Lines 
string > Strings 
Returns Strings separated by a newline. 
Strings 
StringReplicate 
uint64 > string > Strings 
Return a slice with the input element repeated n times 
Strings 
Words 
string > Strings 
Returns Strings separated by a space. 
Bools 
And 
Bools > bool 
Returns true if all bools are true. 
Bools 
Or 
Bools > bool 
Returns true if any bool is true. 
* (Functions prefixed by a star are functions added to the type itself, where first element in the
signature is the method receiver. So for examples, the Equals method is Ints{1,2}.Equals(Ints{1})
.
But, the IntRange function looks like hasgo.IntRange(0,10)
.
Contributing
You can help out Hasgo in a variety of ways! Here are some ideas:
 Use Hasgo! :smiley:
 Spread the word (Write a blog, tweet, talk about..)
 Suggest features (Create an issue to make a suggestion)
 Report bugs (Similarly, create an issue)
 Contribute code. (Create a PR, we'll gladly take a look and help you get it merged!)
 We have separate [contribution guidelines](CONTRIBUTING.md)
What's in a name?
The name Hasgo is a portmanteau of "Haskell" and "Go". I'm a big fan of both languages, though they are quite different. It's impossible to write real Haskelllike code in Go. There are some obvious differences between the languages in terms of syntax. I hope the functions in this library stay as close as possible to their Haskell implementations. There might be extra functions in here that are not in Haskell, and there will be functions in Haskell that you won't find here.
The inspiration mainly shows in the naming of functions. If the functions were named after Java lambdas, it'd be called "Jago". Sorry if you expected more Haskell goodness (I'm open to suggestions of how more haskell in Hasgo!)
Real Generics?
Currently I have an experimental implementation of hasgo here as hasgo2. It does require a development version of Go installed from source to function correctly at this stage.