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(.module:
[library
[lux (#- Alias)
["@" target]
["." meta]
[abstract
[monad (#+ do)]]
[control
["." io]
["." maybe]
["<>" parser ("#\." monad)
["<.>" code (#+ Parser)]]]
[data
["." product]
["." text
["%" format (#+ format)]]
[collection
["." list ("#\." functor fold)]]]
[type
abstract]
[macro (#+ with_identifiers)
[syntax (#+ syntax:)]
["." code]
["." template]]]])
(abstract: .public (Object brand) Any)
(template [<name>]
[(with_expansions [<brand> (template.identifier [<name> "'"])]
(abstract: .public <brand> Any)
(type: .public <name>
(..Object <brand>)))]
[Nil]
[Function]
)
(template [<name> <type>]
[(type: .public <name>
<type>)]
[Boolean Bit]
[Integer Int]
[Float Frac]
[String Text]
)
(type: Nilable
[Bit Code])
(def: nilable
(Parser Nilable)
(let [token (' #?)]
(<| (<>.and (<>.parses? (<code>.this! token)))
(<>.after (<>.not (<code>.this! token)))
<code>.any)))
(type: Alias
Text)
(def: alias
(Parser Alias)
(<>.after (<code>.this! (' #as)) <code>.local_identifier))
(type: Field
[Bit Text (Maybe Alias) Nilable])
(def: static!
(Parser Any)
(<code>.this! (' #static)))
(def: field
(Parser Field)
(<code>.form ($_ <>.and
(<>.parses? ..static!)
<code>.local_identifier
(<>.maybe ..alias)
..nilable)))
(def: constant
(Parser Field)
(<code>.form ($_ <>.and
(<>\in true)
<code>.local_identifier
(<>.maybe ..alias)
..nilable)))
(type: Common_Method
{#name Text
#alias (Maybe Alias)
#inputs (List Nilable)
#io? Bit
#try? Bit
#output Nilable})
(def: common_method
(Parser Common_Method)
($_ <>.and
<code>.local_identifier
(<>.maybe ..alias)
(<code>.tuple (<>.some ..nilable))
(<>.parses? (<code>.this! (' #io)))
(<>.parses? (<code>.this! (' #try)))
..nilable))
(def: input_variables
(-> (List Nilable) (List [Bit Code]))
(|>> list.enumeration
(list\map (function (_ [idx [nilable? type]])
[nilable? (|> idx %.nat code.local_identifier)]))))
(def: (nilable_type [nilable? type])
(-> Nilable Code)
(if nilable?
(` (.Maybe (~ type)))
type))
(def: (with_nil g!temp [nilable? input])
(-> Code [Bit Code] Code)
(if nilable?
(` (case (~ input)
(#.Some (~ g!temp))
(~ g!temp)
#.None
("scheme object nil")))
input))
(def: (without_nil g!temp [nilable? outputT] output)
(-> Code Nilable Code Code)
(if nilable?
(` (let [(~ g!temp) (~ output)]
(if ("scheme object nil?" (~ g!temp))
#.None
(#.Some (~ g!temp)))))
(` (let [(~ g!temp) (~ output)]
(if (not ("scheme object nil?" (~ g!temp)))
(~ g!temp)
(.panic! "Nil is an invalid value!"))))))
(type: Import
(#Function Common_Method)
(#Constant Field))
(def: import
(Parser Import)
($_ <>.or
(<code>.form ..common_method)
..constant
))
(syntax: .public (try [expression <code>.any])
{#.doc (example (case (try (risky_computation input))
(#.Right success)
(do_something success)
(#.Left error)
(recover_from_failure error)))}
(in (list (` ("lux try" ((~! io.io) (~ expression)))))))
(def: (with_io with? without)
(-> Bit Code Code)
(if with?
(` (io.io (~ without)))
without))
(def: (io_type io? rawT)
(-> Bit Code Code)
(if io?
(` (io.IO (~ rawT)))
rawT))
(def: (with_try with? without_try)
(-> Bit Code Code)
(if with?
(` (..try (~ without_try)))
without_try))
(def: (try_type try? rawT)
(-> Bit Code Code)
(if try?
(` (.Either .Text (~ rawT)))
rawT))
(def: (make_function g!method g!temp source inputsT io? try? outputT)
(-> Code Code Code (List Nilable) Bit Bit Nilable Code)
(let [g!inputs (input_variables inputsT)]
(` (def: ((~ g!method)
[(~+ (list\map product.right g!inputs))])
(-> [(~+ (list\map nilable_type inputsT))]
(~ (|> (nilable_type outputT)
(try_type try?)
(io_type io?))))
(:expected
(~ (<| (with_io io?)
(with_try try?)
(without_nil g!temp outputT)
(` ("scheme apply"
(:as ..Function (~ source))
(~+ (list\map (with_nil g!temp) g!inputs)))))))))))
(syntax: .public (import: [import ..import])
(with_identifiers [g!temp]
(case import
(#Function [name alias inputsT io? try? outputT])
(let [imported (` ("scheme constant" (~ (code.text name))))]
(in (list (..make_function (code.local_identifier (maybe.else name alias))
g!temp
imported
inputsT
io?
try?
outputT))))
(#Constant [_ name alias fieldT])
(let [imported (` ("scheme constant" (~ (code.text name))))]
(in (list (` ((~! syntax:) ((~ (code.local_identifier (maybe.else name alias))))
(\ (~! meta.monad) (~' in)
(list (` (.:as (~ (nilable_type fieldT)) (~ imported))))))))))
)))
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