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parser_test.go
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package golisp2
import (
"testing"
"github.com/stretchr/testify/require"
)
func Test_ParseTokens(t *testing.T) {
t.Run("basic", func(t *testing.T) {
assertNumValue(t, evalStrToVal(t, "; hello there\n(+ 1 2)"), 3)
})
t.Run("fn", func(t *testing.T) {
assertNumValue(t, evalStrToVal(t, `((fn (x) (+ x x)) 5)`), 10)
})
t.Run("if", func(t *testing.T) {
assertNumValue(t, evalStrToVal(t, `(if (== 1 2) (+ 5 5) (+ 10 10))`), 20)
assertNilValue(t, evalStrToVal(t, `(if (== 1 2) (+ 5 5))`))
assertNilValue(t, evalStrToVal(t, `(if (== 1 1))`))
})
t.Run("str", func(t *testing.T) {
assertStringValue(t, evalStrToVal(t, `(concat "abc" "efg")`), "abcefg")
})
t.Run("bool", func(t *testing.T) {
assertBoolValue(t, evalStrToVal(t, `(or true false)`), true)
})
t.Run("let", func(t *testing.T) {
assertNumValue(t, evalStrToVal(t, `
((fn (x)
(let y (+ x x))
(+ y y))
5)`), 20)
})
t.Run("operators", func(t *testing.T) {
t.Run("+", func(t *testing.T) {
assertNumValue(t, evalStrToVal(t, `(+ 1 1)`), 2)
})
t.Run("-", func(t *testing.T) {
assertNumValue(t, evalStrToVal(t, `(- 1 2)`), -1)
})
t.Run("*", func(t *testing.T) {
assertNumValue(t, evalStrToVal(t, `(* 2 3)`), 6)
})
t.Run("/", func(t *testing.T) {
assertNumValue(t, evalStrToVal(t, `(/ 12 3)`), 4)
})
t.Run("==", func(t *testing.T) {
assertBoolValue(t, evalStrToVal(t, `(== 1 1)`), true)
assertBoolValue(t, evalStrToVal(t, `(== 1 2)`), false)
assertBoolValue(t, evalStrToVal(t, `(== 2 1)`), false)
})
t.Run("<", func(t *testing.T) {
assertBoolValue(t, evalStrToVal(t, `(< 1 1)`), false)
assertBoolValue(t, evalStrToVal(t, `(< 1 2)`), true)
assertBoolValue(t, evalStrToVal(t, `(< 2 1)`), false)
})
t.Run(">", func(t *testing.T) {
assertBoolValue(t, evalStrToVal(t, `(> 1 1)`), false)
assertBoolValue(t, evalStrToVal(t, `(> 1 2)`), false)
assertBoolValue(t, evalStrToVal(t, `(> 2 1)`), true)
})
t.Run("<=", func(t *testing.T) {
assertBoolValue(t, evalStrToVal(t, `(<= 1 1)`), true)
assertBoolValue(t, evalStrToVal(t, `(<= 1 2)`), true)
assertBoolValue(t, evalStrToVal(t, `(<= 2 1)`), false)
})
t.Run(">=", func(t *testing.T) {
assertBoolValue(t, evalStrToVal(t, `(>= 1 1)`), true)
assertBoolValue(t, evalStrToVal(t, `(>= 1 2)`), false)
assertBoolValue(t, evalStrToVal(t, `(>= 2 1)`), true)
})
})
t.Run("errorsInParse", func(t *testing.T) {
t.Run("incompleteExpression", func(t *testing.T) {
parseStrToErr(t, `(+ 1 (+ 2 3`)
})
t.Run("invalidToken", func(t *testing.T) {
parseStrToErr(t, `(+ 1. 2)`)
})
t.Run("badOperator", func(t *testing.T) {
err := parseStrToErr(t, `(++== 1 2)`)
require.IsType(t, (*ParseError)(nil), err)
asPE := err.(*ParseError)
require.Equal(t, "++==", asPE.Token.Value)
require.Equal(t, 2, asPE.Token.Pos.Col)
require.Equal(t, 1, asPE.Token.Pos.Row)
})
t.Run("invalidFn", func(t *testing.T) {
parseStrToErr(t, `(fn)`)
parseStrToErr(t, `(fn (+ 1 2))`)
parseStrToErr(t, `(fn "abc")`)
parseStrToErr(t, `(fn (a b 1))`)
parseStrToErr(t, `(fn (a b`)
})
t.Run("invalidLet", func(t *testing.T) {
parseStrToErr(t, `(let)`)
parseStrToErr(t, `(let `)
parseStrToErr(t, `(let a)`)
parseStrToErr(t, `(let 1 a)`)
})
t.Run("invalidIf", func(t *testing.T) {
parseStrToErr(t, `(if)`)
})
})
}