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package parser_test
import (
"fmt"
"log"
"testing"
"github.com/gnolang/parscan/lang/golang"
"github.com/gnolang/parscan/parser"
"github.com/gnolang/parscan/scanner"
)
type etest struct{ src, res, err string }
var GoScanner *scanner.Scanner
func init() {
log.SetFlags(log.Lshortfile)
GoScanner = scanner.NewScanner(golang.GoSpec)
}
func gen(test etest) func(*testing.T) {
return func(t *testing.T) {
interp := parser.NewInterpreter(GoScanner)
errStr := ""
r, e := interp.Eval(test.src)
t.Log(r, e)
if e != nil {
errStr = e.Error()
}
if errStr != test.err {
t.Errorf("got error %#v, want error %#v", errStr, test.err)
}
if res := fmt.Sprintf("%v", r); test.err == "" && res != test.res {
t.Errorf("got %#v, want %#v", res, test.res)
}
}
}
func run(t *testing.T, tests []etest) {
for _, test := range tests {
test := test
t.Run("", gen(test))
}
}
func TestExpr(t *testing.T) {
run(t, []etest{
{src: "", res: "<nil>"},
{src: "1+2", res: "3"},
{src: "1+", err: "block not terminated"},
{src: "a := 1 + 2; b := 0; a + 1", res: "4"},
{src: "1+(2+3)", res: "6"},
{src: "(1+2)+3", res: "6"},
{src: "(6+(1+2)+3)+5", res: "17"},
{src: "(6+(1+2+3)+5", err: "1:1: block not terminated"},
{src: "a := 2; a = 3; a", res: "3"},
{src: "2 * 3 + 1 == 7", res: "true"},
{src: "7 == 2 * 3 + 1", res: "true"},
{src: "1 + 3 * 2 == 2 * 3 + 1", res: "true"},
{src: "a := 1 + 3 * 2 == 2 * 3 + 1; a", res: "true"},
})
}
func TestLogical(t *testing.T) {
run(t, []etest{
{src: "true && false", res: "false"},
{src: "true && true", res: "true"},
{src: "true && true && false", res: "false"},
{src: "false || true && true", res: "true"},
{src: "2 < 3 && 1 > 2 || 3 == 3", res: "true"},
{src: "2 > 3 && 1 > 2 || 3 == 3", res: "true"},
{src: "2 > 3 || 2 == 1+1 && 3>0", res: "true"},
{src: "2 > 3 || 2 == 1+1 && 3>4 || 1<2", res: "true"},
{src: "a := 1+1 < 3 && 4 == 2+2; a", res: "true"},
{src: "a := 1+1 < 3 || 3 == 2+2; a", res: "true"},
})
}
func TestFunc(t *testing.T) {
run(t, []etest{
{src: "func f() int {return 2}; a := f(); a", res: "2"},
{src: "func f() int {return 2}; f()", res: "2"},
{src: "func f(a int) int {return a+2}; f(3)", res: "5"},
{src: "func f(a int) int {if a < 4 {a = 5}; return a }; f(3)", res: "5"},
{src: "func f(a int) int {return a+2}; 7 - f(3)", res: "2"},
{src: "func f(a int) int {return a+2}; f(5) - f(3)", res: "2"},
{src: "func f(a int) int {return a+2}; f(3) - 2", res: "3"},
{src: "func f(a, b, c int) int {return a+b-c} ; f(7, 1, 3)", res: "5"},
})
}
func TestIf(t *testing.T) {
run(t, []etest{
{src: "a := 0; if a == 0 { a = 2 } else { a = 1 }; a", res: "2"},
{src: "a := 0; if a == 1 { a = 2 } else { a = 1 }; a", res: "1"},
{src: "a := 0; if a == 1 { a = 2 } else if a == 0 { a = 3 } else { a = 1 }; a", res: "3"},
{src: "a := 0; if a == 1 { a = 2 } else if a == 2 { a = 3 } else { a = 1 }; a", res: "1"},
{src: "a := 1; if a > 0 && a < 2 { a = 3 }; a", res: "3"},
{src: "a := 1; if a < 0 || a < 2 { a = 3 }; a", res: "3"},
})
}
func TestFor(t *testing.T) {
run(t, []etest{
{src: "a := 0; for i := 0; i < 3; i = i+1 {a = a+i}; a", res: "3"},
{src: "func f() int {a := 0; for i := 0; i < 3; i = i+1 {a = a+i}; return a}; f()", res: "3"},
{src: "a := 0; for {a = a+1; if a == 3 {break}}; a", res: "3"},
{src: "func f() int {a := 0; for {a = a+1; if a == 3 {break}}; return a}; f()", res: "3"},
{src: "func f() int {a := 0; for {a = a+1; if a < 3 {continue}; break}; return a}; f()", res: "3"},
})
}
func TestGoto(t *testing.T) {
run(t, []etest{{
src: `
func f(a int) int {
a = a+1
goto end
a = a+1
end:
return a
}
f(3)`, res: "4"},
})
}
func TestSwitch(t *testing.T) {
src0 := `func f(a int) int {
switch a {
default: a = 0
case 1,2: a = a+1
case 3: a = a+2; break; a = 3
case 4: a = 10
}
return a
}
`
src1 := `func f(a int) int {
switch {
case a < 3: return 2
case a < 5: return 5
default: a = 0
}
return a
}
`
run(t, []etest{
{src: src0 + "f(1)", res: "2"},
{src: src0 + "f(2)", res: "3"},
{src: src0 + "f(3)", res: "5"},
{src: src0 + "f(4)", res: "10"},
{src: src0 + "f(5)", res: "0"},
{src: src1 + "f(1)", res: "2"},
{src: src1 + "f(4)", res: "5"},
{src: src1 + "f(6)", res: "0"},
})
}
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