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(if) without else case is now supported.

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This commit is contained in:
Devine Lu Linvega 2019-07-15 17:16:09 +09:00
parent 5c6e78eab5
commit ea0d4c3b4a
2 changed files with 3 additions and 4 deletions
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4
desktop/sources/scripts/lisp.js
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@ -53,7 +53,7 @@ function Lisp (input, lib) {
if (interpret(input[1], context)) {
return interpret(input[2], context)
}
return interpret(input[3], context)
return input[3] ? interpret(input[3], context) : []
}
}
@ -66,7 +66,7 @@ function Lisp (input, lib) {
}
const interpret = function (input, context) {
if (!input) { return null }
if (!input) { console.warn('error', context.scope); return null }
if (context === undefined) {
return interpret(input, new Context(lib))

3
examples/benchmark.lisp
View File

@ -21,13 +21,12 @@
(test "gt" (gt 3 4) false)
(test "and - true" (and 1 2 true 4) 4)
(test "and - false" (and 1 false 2) false)
(test "or - true" (or false false 2 false) 2)
(test "if - branch 1" (if (gt 3 2) ("branch 1") ("branch 2")) "branch 1")
(test "if - branch 2" (if (lt 3 2) ("branch 1") ("branch 2")) "branch 2")
(test "if - no else" (if (lt 3 2) ("branch 1")) ())
; Arrays