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test.js
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test.js
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const test = require('ava')
const SchemeLang = require('./index.js')
let schemelang = new SchemeLang()
const scheme = schemelang.interpret
const parser = schemelang.parse
const handle = schemelang.handle
test('parse', t => {
t.deepEqual(parser('(define a 5)'), ['define','a',5])
})
test('handle', t => {
t.deepEqual(handle(['define','l',['abslist','a','b','c']]), ['list','a','b','c'])
})
test('define', t => {
scheme('(clear)')
scheme('(define a 5)')
t.is(scheme('a'), 5)
})
test('action', t => {
scheme('(clear)')
t.is(scheme('(define a (+ 5 4))'), 9)
})
test('lambda', t => {
scheme('(clear)')
let meth = scheme('(define func (lambda (a b) (+ a b)))')
t.is(typeof meth, 'function')
})
test('exec lambda', t => {
t.is(scheme('(func 2 3)'), 5)
})
test('list car', t => {
t.is(scheme("(car '(a b c d))"), "a")
})
test('list cdr', t => {
t.deepEqual(scheme("(cdr '(a b c d))"), ['list','b','c','d'])
})
test('list cadr', t => {
t.is(scheme("(cadr '(a b c d))"), 'b')
})
test('list define', t => {
scheme('(clear)')
t.deepEqual(scheme("(define tot '(+ a b))"), ['list','+','a','b'])
})
test('list read', t => {
t.deepEqual(scheme("tot"), ['list','+','a','b'])
})
test('list eval', t => {
t.is(scheme("(define a 5)"), 5)
t.is(scheme("(define b 4)"), 4)
t.is(scheme("(eval tot)"),9)
})
test('lambda recurs', t => {
scheme('(define rev (lambda (l) (if (null? l) l (append (rev (cdr l)) (list (car l))))))')
t.deepEqual(scheme("(rev '(a b c d))"), ['list','d','c','b','a'])
})
test('cons', t => {
scheme('(clear)')
scheme("(define l1 '(a b c d))")
scheme("(define l2 '(1 2 3 4))")
t.deepEqual(scheme("(cons (car l1) (cdr l2))"), ['list','a',2,3,4])
t.deepEqual(scheme("(cons '(g h) (cdr l2))"), ['list',['list','g','h'],2,3,4])
})
test('negate', t => {
scheme('(clear)')
scheme("(define a #t)")
scheme("(define b #f)")
t.is(scheme("a"), true)
t.is(scheme("b"), false)
t.is(scheme("(not b)"), true)
})
test('let', t => {
scheme('(clear)')
scheme("(define func (lambda (n) (let ((a 5)) (- a n))))")
t.is(scheme("(func 5)"), 0)
t.is(scheme("(func (- 5))"), 10)
})
test('specific scheme env', t => {
let sc1 = new SchemeLang({'a':3})
let sc2 = new SchemeLang({'a':5})
let sc3 = new SchemeLang()
t.is(sc1.interpret("a"), 3)
t.is(sc2.interpret("a"), 5)
t.is(sc3.interpret("(define a 7)"), 7)
t.is(sc3.interpret("a"), 7)
})
test('and', t => {
t.is(scheme('(and #t #t #f)'),false)
t.is(scheme('(and #f #t #t)'),false)
t.is(scheme('(and #t #t #t)'),true)
t.is(scheme('(and #t #t 5)'),5)
t.is(scheme('(and 5 #t 7)'),7)
t.is(scheme('(and 5 #f 7)'),false)
t.deepEqual(scheme("(and 5 #t '(a b))"),['list','a','b'])
})
test('or', t => {
t.is(scheme('(or #f #f #t)'),true)
t.is(scheme('(or #f #t #f)'),true)
t.is(scheme('(or #f 7 #f)'),7)
t.is(scheme('(or 5 7 #f)'),5)
t.is(scheme('(or #f #f #f)'),false)
t.deepEqual(scheme("(or '(a b) #f #f)"),['list','a','b'])
})
test('string', t => {
t.is(scheme('"hello world"'),'"hello world"')
t.is(scheme('(define a "holo")'),'"holo"')
t.is(scheme('a'),'"holo"')
scheme('(define a (lambda (a) (if (> a 5) "is bigger" "is less")))')
t.is(scheme('(a 10)'),'"is bigger"')
t.is(scheme('(a 2)'),'"is less"')
})
test('string in list', t => {
scheme("(define a '(define a \"hello world\"))")
t.deepEqual(scheme('a'), ['list','define','a','"hello world"'])
})