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