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# PGF2
This is a Haskell binding to the PGF runtime in C.
The exposed modules are:
- `PGF2`: a user API similar to Python and Java APIs
- `PGF2.Internal`: an internal module with FFI definitions for the relevant C functions
## How to compile
```
cabal install
```
**Note:** you must have the PGF C runtime already installed and available.
See <https://github.com/GrammaticalFramework/gf-core/blob/master/src/runtime/c/INSTALL>
## How to use
Import PGF to the Haskell program that you're writing.
The Cabal infrastructure will make sure to tell the compiler
where to find the relevant modules.
## Example
```haskell
module Main where
import PGF2
import qualified Data.Map as Map
main = do
pgf <- readPGF "App12.pgf"
let Just eng = Map.lookup "AppEng" (languages pgf)
-- Parsing
let res = parse eng (startCat pgf) "this is a small theatre"
let ParseOk ((tree,prob):rest) = res
print tree
-- Linearisation
let Just expr = readExpr "AdjCN (PositA red_A) (UseN theatre_N)"
let s = linearize eng expr
print s
```
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