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// Copyright 2023 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package eval
import (
"math"
"strings"
"testing"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
func tokens(s string) (a []any) {
for _, v := range strings.Fields(s) {
a = append(a, v)
}
return a
}
func TestEval(t *testing.T) {
n, err := Expr(0, "/", 0.0)
require.NoError(t, err)
assert.True(t, math.IsNaN(n.Value.(float64)))
_, err = Expr(nil)
require.ErrorContains(t, err, "unsupported token type")
_, err = Expr([]string{})
require.ErrorContains(t, err, "unsupported token type")
_, err = Expr(struct{}{})
require.ErrorContains(t, err, "unsupported token type")
cases := []struct {
expr string
want any
}{
{"-1", int64(-1)},
{"1 + 2", int64(3)},
{"3 - 2 + 4", int64(5)},
{"1 + 2 * 3", int64(7)},
{"1 + ( 2 * 3 )", int64(7)},
{"( 1 + 2 ) * 3", int64(9)},
{"( 1 + 2.0 ) / 3", float64(1)},
{"sum( 1 , 2 , 3 , 4 )", int64(10)},
{"100 + sum( 1 , 2 + 3 , 0.0 ) / 2", float64(103)},
{"100 * 5 / ( 5 + 15 )", int64(25)},
{"9 == 5", int64(0)},
{"5 == 5", int64(1)},
{"9 != 5", int64(1)},
{"5 != 5", int64(0)},
{"9 > 5", int64(1)},
{"5 > 9", int64(0)},
{"5 >= 9", int64(0)},
{"9 >= 9", int64(1)},
{"9 < 5", int64(0)},
{"5 < 9", int64(1)},
{"9 <= 5", int64(0)},
{"5 <= 5", int64(1)},
{"1 and 2", int64(1)}, // Golang template definition: non-zero values are all truth
{"1 and 0", int64(0)},
{"0 and 0", int64(0)},
{"1 or 2", int64(1)},
{"1 or 0", int64(1)},
{"0 or 1", int64(1)},
{"0 or 0", int64(0)},
{"not 2 == 1", int64(1)},
{"not not ( 9 < 5 )", int64(0)},
}
for _, c := range cases {
n, err := Expr(tokens(c.expr)...)
require.NoError(t, err, "expr: %s", c.expr)
assert.Equal(t, c.want, n.Value)
}
bads := []struct {
expr string
errMsg string
}{
{"0 / 0", "integer divide by zero"},
{"1 +", "num stack is empty"},
{"+ 1", "num stack is empty"},
{"( 1", "incomplete sub-expression"},
{"1 )", "op stack is empty"}, // can not find the corresponding open bracket after the stack becomes empty
{"1 , 2", "expect 1 value as final result"},
{"( 1 , 2 )", "too many values in one bracket"},
{"1 a 2", "unknown operator"},
}
for _, c := range bads {
_, err = Expr(tokens(c.expr)...)
require.ErrorContains(t, err, c.errMsg, "expr: %s", c.expr)
}
}
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