1012 lines
25 KiB
Plaintext
1012 lines
25 KiB
Plaintext
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|
||
"font-family: monospace;\n",
|
||
"margin-left: 1em;\n",
|
||
"}\n",
|
||
".mono {\n",
|
||
"font-family: monospace;\n",
|
||
"display: block;\n",
|
||
"}\n",
|
||
".err-msg {\n",
|
||
"color: red;\n",
|
||
"font-style: italic;\n",
|
||
"font-family: monospace;\n",
|
||
"white-space: pre;\n",
|
||
"display: block;\n",
|
||
"}\n",
|
||
"#unshowable {\n",
|
||
"color: red;\n",
|
||
"font-weight: bold;\n",
|
||
"}\n",
|
||
".err-msg.in.collapse {\n",
|
||
"padding-top: 0.7em;\n",
|
||
"}\n",
|
||
".highlight-code {\n",
|
||
"white-space: pre;\n",
|
||
"font-family: monospace;\n",
|
||
"}\n",
|
||
".suggestion-warning { \n",
|
||
"font-weight: bold;\n",
|
||
"color: rgb(200, 130, 0);\n",
|
||
"}\n",
|
||
".suggestion-error { \n",
|
||
"font-weight: bold;\n",
|
||
"color: red;\n",
|
||
"}\n",
|
||
".suggestion-name {\n",
|
||
"font-weight: bold;\n",
|
||
"}\n",
|
||
"</style><span class='get-type'>(%~) :: forall s t a b. ASetter s t a b -> (a -> b) -> s -> t</span>"
|
||
],
|
||
"text/plain": [
|
||
"(%~) :: forall s t a b. ASetter s t a b -> (a -> b) -> s -> t"
|
||
]
|
||
},
|
||
"metadata": {},
|
||
"output_type": "display_data"
|
||
}
|
||
],
|
||
"source": [
|
||
"{-# LANGUAGE TemplateHaskell #-}\n",
|
||
"{-# LANGUAGE FlexibleInstances #-}\n",
|
||
"{-# LANGUAGE FlexibleContexts #-}\n",
|
||
"{-# LANGUAGE RankNTypes #-}\n",
|
||
"{-# LANGUAGE ScopedTypeVariables #-}\n",
|
||
"{-# LANGUAGE TypeApplications #-}\n",
|
||
"{-# LANGUAGE TypeFamilies #-}\n",
|
||
"{-# LANGUAGE InstanceSigs #-}\n",
|
||
"\n",
|
||
"import Control.Lens\n",
|
||
"import Numeric.Lens\n",
|
||
"import Data.Bits.Lens\n",
|
||
"import Data.Data.Lens\n",
|
||
"\n",
|
||
"import Control.Applicative\n",
|
||
"import Data.Char as C\n",
|
||
"import qualified Data.Map as M\n",
|
||
"import qualified Data.Set as S\n",
|
||
"import qualified Data.Text as T\n",
|
||
"import qualified Data.List as L\n",
|
||
"\n",
|
||
":t view\n",
|
||
":t set \n",
|
||
":t over\n",
|
||
"\n",
|
||
"-- Infix variants\n",
|
||
"\n",
|
||
":t (^.) -- flip view\n",
|
||
":t (.~)\n",
|
||
":t (%~)"
|
||
]
|
||
},
|
||
{
|
||
"cell_type": "code",
|
||
"execution_count": 4,
|
||
"metadata": {},
|
||
"outputs": [
|
||
{
|
||
"data": {
|
||
"text/html": [
|
||
"<style>/* Styles used for the Hoogle display in the pager */\n",
|
||
".hoogle-doc {\n",
|
||
"display: block;\n",
|
||
"padding-bottom: 1.3em;\n",
|
||
"padding-left: 0.4em;\n",
|
||
"}\n",
|
||
".hoogle-code {\n",
|
||
"display: block;\n",
|
||
"font-family: monospace;\n",
|
||
"white-space: pre;\n",
|
||
"}\n",
|
||
".hoogle-text {\n",
|
||
"display: block;\n",
|
||
"}\n",
|
||
".hoogle-name {\n",
|
||
"color: green;\n",
|
||
"font-weight: bold;\n",
|
||
"}\n",
|
||
".hoogle-head {\n",
|
||
"font-weight: bold;\n",
|
||
"}\n",
|
||
".hoogle-sub {\n",
|
||
"display: block;\n",
|
||
"margin-left: 0.4em;\n",
|
||
"}\n",
|
||
".hoogle-package {\n",
|
||
"font-weight: bold;\n",
|
||
"font-style: italic;\n",
|
||
"}\n",
|
||
".hoogle-module {\n",
|
||
"font-weight: bold;\n",
|
||
"}\n",
|
||
".hoogle-class {\n",
|
||
"font-weight: bold;\n",
|
||
"}\n",
|
||
".get-type {\n",
|
||
"color: green;\n",
|
||
"font-weight: bold;\n",
|
||
"font-family: monospace;\n",
|
||
"display: block;\n",
|
||
"white-space: pre-wrap;\n",
|
||
"}\n",
|
||
".show-type {\n",
|
||
"color: green;\n",
|
||
"font-weight: bold;\n",
|
||
"font-family: monospace;\n",
|
||
"margin-left: 1em;\n",
|
||
"}\n",
|
||
".mono {\n",
|
||
"font-family: monospace;\n",
|
||
"display: block;\n",
|
||
"}\n",
|
||
".err-msg {\n",
|
||
"color: red;\n",
|
||
"font-style: italic;\n",
|
||
"font-family: monospace;\n",
|
||
"white-space: pre;\n",
|
||
"display: block;\n",
|
||
"}\n",
|
||
"#unshowable {\n",
|
||
"color: red;\n",
|
||
"font-weight: bold;\n",
|
||
"}\n",
|
||
".err-msg.in.collapse {\n",
|
||
"padding-top: 0.7em;\n",
|
||
"}\n",
|
||
".highlight-code {\n",
|
||
"white-space: pre;\n",
|
||
"font-family: monospace;\n",
|
||
"}\n",
|
||
".suggestion-warning { \n",
|
||
"font-weight: bold;\n",
|
||
"color: rgb(200, 130, 0);\n",
|
||
"}\n",
|
||
".suggestion-error { \n",
|
||
"font-weight: bold;\n",
|
||
"color: red;\n",
|
||
"}\n",
|
||
".suggestion-name {\n",
|
||
"font-weight: bold;\n",
|
||
"}\n",
|
||
"</style><span class='get-type'>(payload . cargo) :: forall (f :: * -> *). Functor f => (String -> f String) -> Ship -> f Ship</span>"
|
||
],
|
||
"text/plain": [
|
||
"(payload . cargo) :: forall (f :: * -> *). Functor f => (String -> f String) -> Ship -> f Ship"
|
||
]
|
||
},
|
||
"metadata": {},
|
||
"output_type": "display_data"
|
||
},
|
||
{
|
||
"data": {
|
||
"text/plain": [
|
||
"\"Livestock\""
|
||
]
|
||
},
|
||
"metadata": {},
|
||
"output_type": "display_data"
|
||
},
|
||
{
|
||
"data": {
|
||
"text/plain": [
|
||
"\"Livestock\""
|
||
]
|
||
},
|
||
"metadata": {},
|
||
"output_type": "display_data"
|
||
}
|
||
],
|
||
"source": [
|
||
"-- view ^.\n",
|
||
"\n",
|
||
"data Payload =\n",
|
||
" Payload { _weightKilos :: Int\n",
|
||
" , _cargo :: String \n",
|
||
" } deriving (Show)\n",
|
||
" \n",
|
||
"data Ship =\n",
|
||
" Ship { _payload :: Payload\n",
|
||
" } deriving (Show)\n",
|
||
" \n",
|
||
"makeLenses ''Payload\n",
|
||
"makeLenses ''Ship\n",
|
||
"\n",
|
||
"serenity :: Ship\n",
|
||
"serenity = Ship (Payload 50000 \"Livestock\")\n",
|
||
"\n",
|
||
":t (payload . cargo)\n",
|
||
"\n",
|
||
"view (payload . cargo) serenity\n",
|
||
"\n",
|
||
"serenity ^. payload . cargo"
|
||
]
|
||
},
|
||
{
|
||
"cell_type": "code",
|
||
"execution_count": 5,
|
||
"metadata": {},
|
||
"outputs": [
|
||
{
|
||
"data": {
|
||
"text/plain": [
|
||
"Ship {_payload = Payload {_weightKilos = 50000, _cargo = \"Medicine\"}}"
|
||
]
|
||
},
|
||
"metadata": {},
|
||
"output_type": "display_data"
|
||
},
|
||
{
|
||
"data": {
|
||
"text/plain": [
|
||
"Ship {_payload = Payload {_weightKilos = 50000, _cargo = \"Medicine\"}}"
|
||
]
|
||
},
|
||
"metadata": {},
|
||
"output_type": "display_data"
|
||
}
|
||
],
|
||
"source": [
|
||
"-- set .~\n",
|
||
"\n",
|
||
"set (payload . cargo) \"Medicine\" serenity\n",
|
||
"\n",
|
||
"serenity & payload . cargo .~ \"Medicine\""
|
||
]
|
||
},
|
||
{
|
||
"cell_type": "code",
|
||
"execution_count": 7,
|
||
"metadata": {},
|
||
"outputs": [
|
||
{
|
||
"data": {
|
||
"text/plain": [
|
||
"Ship {_payload = Payload {_weightKilos = 2310, _cargo = \"Chocolate\"}}"
|
||
]
|
||
},
|
||
"metadata": {},
|
||
"output_type": "display_data"
|
||
},
|
||
{
|
||
"data": {
|
||
"text/plain": [
|
||
"Ship {_payload = Payload {_weightKilos = 2310, _cargo = \"Chocolate\"}}"
|
||
]
|
||
},
|
||
"metadata": {},
|
||
"output_type": "display_data"
|
||
}
|
||
],
|
||
"source": [
|
||
"serenity\n",
|
||
" & payload . cargo .~ \"Chocolate\"\n",
|
||
" & payload . weightKilos .~ 2310\n",
|
||
" \n",
|
||
"serenity\n",
|
||
" & set (payload . cargo) \"Chocolate\"\n",
|
||
" & set (payload . weightKilos) 2310"
|
||
]
|
||
},
|
||
{
|
||
"cell_type": "code",
|
||
"execution_count": 8,
|
||
"metadata": {},
|
||
"outputs": [
|
||
{
|
||
"data": {
|
||
"text/plain": [
|
||
"Ship {_payload = Payload {_weightKilos = 49000, _cargo = \"Chocolate\"}}"
|
||
]
|
||
},
|
||
"metadata": {},
|
||
"output_type": "display_data"
|
||
}
|
||
],
|
||
"source": [
|
||
"-- over %~\n",
|
||
"\n",
|
||
"serenity\n",
|
||
" & payload . weightKilos %~ subtract 1000\n",
|
||
" & payload . cargo .~ \"Chocolate\""
|
||
]
|
||
},
|
||
{
|
||
"cell_type": "code",
|
||
"execution_count": 12,
|
||
"metadata": {},
|
||
"outputs": [
|
||
{
|
||
"data": {
|
||
"text/plain": [
|
||
"(2,35)"
|
||
]
|
||
},
|
||
"metadata": {},
|
||
"output_type": "display_data"
|
||
},
|
||
{
|
||
"data": {
|
||
"text/plain": [
|
||
"(2,15.0)"
|
||
]
|
||
},
|
||
"metadata": {},
|
||
"output_type": "display_data"
|
||
},
|
||
{
|
||
"data": {
|
||
"text/plain": [
|
||
"(8,30)"
|
||
]
|
||
},
|
||
"metadata": {},
|
||
"output_type": "display_data"
|
||
},
|
||
{
|
||
"data": {
|
||
"text/plain": [
|
||
"(True,30)"
|
||
]
|
||
},
|
||
"metadata": {},
|
||
"output_type": "display_data"
|
||
},
|
||
{
|
||
"data": {
|
||
"text/plain": [
|
||
"(\"abracadabra\",30)"
|
||
]
|
||
},
|
||
"metadata": {},
|
||
"output_type": "display_data"
|
||
}
|
||
],
|
||
"source": [
|
||
"-- ^ Usually denote that the actions view/gets something\n",
|
||
"-- . Typically used to represent the absence of any other modifiers\n",
|
||
"\n",
|
||
"-- % Means \"modify\" using a location\n",
|
||
"-- ~ Denotes that this action updates or sets something\n",
|
||
"\n",
|
||
"-- +~, -~, *~ Add, substract or multiply a value with focus\n",
|
||
"\n",
|
||
"(2, 30) & _2 +~ 5\n",
|
||
"\n",
|
||
"-- //∼ Divide the focus by a provided denominator\n",
|
||
"\n",
|
||
"(2, 30) & _2 //~ 2\n",
|
||
"\n",
|
||
"-- ^∼ , ^^∼ , **∼\n",
|
||
"\n",
|
||
"(2, 30) & _1 ^~ 3\n",
|
||
"\n",
|
||
"-- ||∼ , &&∼\n",
|
||
"\n",
|
||
"(False, 30) & _1 ||~ True\n",
|
||
"\n",
|
||
"-- <>∼ mappend a value onto the focus (from the right).\n",
|
||
"\n",
|
||
"(\"abra\", 30) & _1 <>~ \"cadabra\""
|
||
]
|
||
},
|
||
{
|
||
"cell_type": "code",
|
||
"execution_count": 15,
|
||
"metadata": {},
|
||
"outputs": [
|
||
{
|
||
"data": {
|
||
"text/plain": [
|
||
"(35,Thermometer {_temperature = 35})"
|
||
]
|
||
},
|
||
"metadata": {},
|
||
"output_type": "display_data"
|
||
},
|
||
{
|
||
"data": {
|
||
"text/plain": [
|
||
"(20,Thermometer {_temperature = 35})"
|
||
]
|
||
},
|
||
"metadata": {},
|
||
"output_type": "display_data"
|
||
}
|
||
],
|
||
"source": [
|
||
"newtype Thermometer =\n",
|
||
" Thermometer { _temperature :: Int\n",
|
||
" } deriving Show\n",
|
||
"makeLenses ''Thermometer\n",
|
||
"\n",
|
||
"-- < Get the altered focus in addition to modifying it.\n",
|
||
"\n",
|
||
"Thermometer 20 & temperature <+~ 15\n",
|
||
"\n",
|
||
"-- << Get the OLD focus in addition to setting a new one.\n",
|
||
"\n",
|
||
"Thermometer 20 & temperature <<+~ 15"
|
||
]
|
||
},
|
||
{
|
||
"cell_type": "markdown",
|
||
"metadata": {},
|
||
"source": [
|
||
"### Exercises"
|
||
]
|
||
},
|
||
{
|
||
"cell_type": "code",
|
||
"execution_count": 16,
|
||
"metadata": {},
|
||
"outputs": [],
|
||
"source": [
|
||
"-- 1.\n",
|
||
"data Gate =\n",
|
||
" Gate { _open :: Bool\n",
|
||
" , _oilTemp :: Float\n",
|
||
" } deriving Show\n",
|
||
"makeLenses ''Gate\n",
|
||
"\n",
|
||
"data Army =\n",
|
||
" Army { _archers :: Int\n",
|
||
" , _knights :: Int\n",
|
||
" } deriving Show\n",
|
||
"makeLenses ''Army\n",
|
||
"\n",
|
||
"data Kingdom = \n",
|
||
" Kingdom { _name :: String\n",
|
||
" , _army :: Army\n",
|
||
" , _gate :: Gate\n",
|
||
" } deriving Show\n",
|
||
"makeLenses ''Kingdom\n",
|
||
" \n",
|
||
"duloc :: Kingdom\n",
|
||
"duloc = \n",
|
||
" Kingdom { _name = \"Duloc\"\n",
|
||
" , _army = Army { _archers = 22\n",
|
||
" , _knights = 44\n",
|
||
" }\n",
|
||
" , _gate = Gate { _open = True\n",
|
||
" , _oilTemp = 10.0\n",
|
||
" }\n",
|
||
" }"
|
||
]
|
||
}
|
||
],
|
||
"metadata": {
|
||
"kernelspec": {
|
||
"display_name": "Haskell",
|
||
"language": "haskell",
|
||
"name": "haskell"
|
||
},
|
||
"language_info": {
|
||
"codemirror_mode": "ihaskell",
|
||
"file_extension": ".hs",
|
||
"name": "haskell",
|
||
"pygments_lexer": "Haskell",
|
||
"version": "8.6.5"
|
||
}
|
||
},
|
||
"nbformat": 4,
|
||
"nbformat_minor": 2
|
||
}
|