mirror of
https://github.com/kanaka/mal.git
synced 2024-09-19 17:47:53 +03:00
94 lines
2.6 KiB
Smalltalk
94 lines
2.6 KiB
Smalltalk
String extend [
|
|
String >> loadRelative [
|
|
| scriptPath scriptDirectory |
|
|
scriptPath := thisContext currentFileName.
|
|
scriptDirectory := FilePath stripFileNameFor: scriptPath.
|
|
FileStream fileIn: (FilePath append: self to: scriptDirectory)
|
|
]
|
|
]
|
|
|
|
'readline.st' loadRelative.
|
|
'util.st' loadRelative.
|
|
'types.st' loadRelative.
|
|
'reader.st' loadRelative.
|
|
'printer.st' loadRelative.
|
|
|
|
Object subclass: MAL [
|
|
MAL class >> READ: input [
|
|
^Reader readStr: input
|
|
]
|
|
|
|
MAL class >> evalAst: sexp env: env [
|
|
sexp type = #symbol ifTrue: [
|
|
^env at: sexp value ifAbsent: [
|
|
^MALUnknownSymbol new signal: sexp value
|
|
].
|
|
].
|
|
|
|
sexp type = #list ifTrue: [
|
|
^self evalList: sexp env: env class: MALList
|
|
].
|
|
sexp type = #vector ifTrue: [
|
|
^self evalList: sexp env: env class: MALVector
|
|
].
|
|
sexp type = #map ifTrue: [
|
|
^self evalList: sexp env: env class: MALMap
|
|
].
|
|
|
|
^sexp
|
|
]
|
|
|
|
MAL class >> evalList: sexp env: env class: aClass [
|
|
| items |
|
|
items := sexp value collect:
|
|
[ :item | self EVAL: item env: env ].
|
|
^aClass new: items
|
|
]
|
|
|
|
MAL class >> EVAL: sexp env: env [
|
|
| forms function args |
|
|
sexp type ~= #list ifTrue: [
|
|
^self evalAst: sexp env: env
|
|
].
|
|
sexp value isEmpty ifTrue: [
|
|
^sexp
|
|
].
|
|
|
|
forms := (self evalAst: sexp env: env) value.
|
|
function := forms first.
|
|
args := forms allButFirst asArray.
|
|
^function valueWithArguments: args
|
|
]
|
|
|
|
MAL class >> PRINT: sexp [
|
|
^Printer prStr: sexp printReadably: true
|
|
]
|
|
|
|
MAL class >> rep: input env: env [
|
|
^self PRINT: (self EVAL: (self READ: input) env: env)
|
|
]
|
|
]
|
|
|
|
| input historyFile replEnv |
|
|
|
|
historyFile := '.mal_history'.
|
|
ReadLine readHistory: historyFile.
|
|
replEnv := Dictionary from:
|
|
{ #+ -> [ :a :b | MALNumber new: a value + b value ].
|
|
#- -> [ :a :b | MALNumber new: a value - b value ].
|
|
#* -> [ :a :b | MALNumber new: a value * b value ].
|
|
#/ -> [ :a :b | MALNumber new: a value // b value ] }.
|
|
|
|
[ input := ReadLine readLine: 'user> '. input isNil ] whileFalse: [
|
|
input isEmpty ifFalse: [
|
|
ReadLine addHistory: input.
|
|
ReadLine writeHistory: historyFile.
|
|
[ (MAL rep: input env: replEnv) displayNl ]
|
|
on: MALEmptyInput do: [ #return ]
|
|
on: MALError do:
|
|
[ :err | ('error: ', err messageText) displayNl. #return ].
|
|
]
|
|
]
|
|
|
|
'' displayNl.
|