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package expr_test
import (
"context"
"encoding/json"
"fmt"
"os"
"reflect"
"strings"
"sync"
"testing"
"time"
"github.com/expr-lang/expr/conf"
"github.com/expr-lang/expr/internal/testify/assert"
"github.com/expr-lang/expr/internal/testify/require"
"github.com/expr-lang/expr/types"
"github.com/expr-lang/expr/vm"
"github.com/expr-lang/expr"
"github.com/expr-lang/expr/ast"
"github.com/expr-lang/expr/file"
"github.com/expr-lang/expr/test/mock"
)
func ExampleEval() {
output, err := expr.Eval("greet + name", map[string]any{
"greet": "Hello, ",
"name": "world!",
})
if err != nil {
fmt.Printf("err: %v", err)
return
}
fmt.Printf("%v", output)
// Output: Hello, world!
}
func ExampleEval_runtime_error() {
_, err := expr.Eval(`map(1..3, {1 % (# - 3)})`, nil)
fmt.Print(err)
// Output: runtime error: integer divide by zero (1:14)
// | map(1..3, {1 % (# - 3)})
// | .............^
}
func ExampleCompile() {
env := map[string]any{
"foo": 1,
"bar": 99,
}
program, err := expr.Compile("foo in 1..99 and bar in 1..99", expr.Env(env))
if err != nil {
fmt.Printf("%v", err)
return
}
output, err := expr.Run(program, env)
if err != nil {
fmt.Printf("%v", err)
return
}
fmt.Printf("%v", output)
// Output: true
}
func ExampleEnv() {
type Segment struct {
Origin string
}
type Passengers struct {
Adults int
}
type Meta struct {
Tags map[string]string
}
type Env struct {
Meta
Segments []*Segment
Passengers *Passengers
Marker string
}
code := `all(Segments, {.Origin == "MOW"}) && Passengers.Adults > 0 && Tags["foo"] startsWith "bar"`
program, err := expr.Compile(code, expr.Env(Env{}))
if err != nil {
fmt.Printf("%v", err)
return
}
env := Env{
Meta: Meta{
Tags: map[string]string{
"foo": "bar",
},
},
Segments: []*Segment{
{Origin: "MOW"},
},
Passengers: &Passengers{
Adults: 2,
},
Marker: "test",
}
output, err := expr.Run(program, env)
if err != nil {
fmt.Printf("%v", err)
return
}
fmt.Printf("%v", output)
// Output: true
}
func ExampleEnv_tagged_field_names() {
env := struct {
FirstWord string
Separator string `expr:"Space"`
SecondWord string `expr:"second_word"`
}{
FirstWord: "Hello",
Separator: " ",
SecondWord: "World",
}
output, err := expr.Eval(`FirstWord + Space + second_word`, env)
if err != nil {
fmt.Printf("%v", err)
return
}
fmt.Printf("%v", output)
// Output: Hello World
}
func ExampleEnv_hidden_tagged_field_names() {
type Internal struct {
Visible string
Hidden string `expr:"-"`
}
type environment struct {
Visible string
Hidden string `expr:"-"`
HiddenInternal Internal `expr:"-"`
VisibleInternal Internal
}
env := environment{
Hidden: "First level secret",
HiddenInternal: Internal{
Visible: "Second level secret",
Hidden: "Also hidden",
},
VisibleInternal: Internal{
Visible: "Not a secret",
Hidden: "Hidden too",
},
}
hiddenValues := []string{
`Hidden`,
`HiddenInternal`,
`HiddenInternal.Visible`,
`HiddenInternal.Hidden`,
`VisibleInternal["Hidden"]`,
}
for _, expression := range hiddenValues {
output, err := expr.Eval(expression, env)
if err == nil || !strings.Contains(err.Error(), "cannot fetch") {
fmt.Printf("unexpected output: %v; err: %v\n", output, err)
return
}
fmt.Printf("%q is hidden as expected\n", expression)
}
visibleValues := []string{
`Visible`,
`VisibleInternal`,
`VisibleInternal["Visible"]`,
}
for _, expression := range visibleValues {
_, err := expr.Eval(expression, env)
if err != nil {
fmt.Printf("unexpected error: %v\n", err)
return
}
fmt.Printf("%q is visible as expected\n", expression)
}
testWithIn := []string{
`not ("Hidden" in $env)`,
`"Visible" in $env`,
`not ("Hidden" in VisibleInternal)`,
`"Visible" in VisibleInternal`,
}
for _, expression := range testWithIn {
val, err := expr.Eval(expression, env)
shouldBeTrue, ok := val.(bool)
if err != nil || !ok || !shouldBeTrue {
fmt.Printf("unexpected result; value: %v; error: %v\n", val, err)
return
}
}
// Output: "Hidden" is hidden as expected
// "HiddenInternal" is hidden as expected
// "HiddenInternal.Visible" is hidden as expected
// "HiddenInternal.Hidden" is hidden as expected
// "VisibleInternal[\"Hidden\"]" is hidden as expected
// "Visible" is visible as expected
// "VisibleInternal" is visible as expected
// "VisibleInternal[\"Visible\"]" is visible as expected
}
func ExampleAsKind() {
program, err := expr.Compile("{a: 1, b: 2}", expr.AsKind(reflect.Map))
if err != nil {
fmt.Printf("%v", err)
return
}
output, err := expr.Run(program, nil)
if err != nil {
fmt.Printf("%v", err)
return
}
fmt.Printf("%v", output)
// Output: map[a:1 b:2]
}
func ExampleAsBool() {
env := map[string]int{
"foo": 0,
}
program, err := expr.Compile("foo >= 0", expr.Env(env), expr.AsBool())
if err != nil {
fmt.Printf("%v", err)
return
}
output, err := expr.Run(program, env)
if err != nil {
fmt.Printf("%v", err)
return
}
fmt.Printf("%v", output.(bool))
// Output: true
}
func ExampleAsBool_error() {
env := map[string]any{
"foo": 0,
}
_, err := expr.Compile("foo + 42", expr.Env(env), expr.AsBool())
fmt.Printf("%v", err)
// Output: expected bool, but got int
}
func ExampleAsInt() {
program, err := expr.Compile("42", expr.AsInt())
if err != nil {
fmt.Printf("%v", err)
return
}
output, err := expr.Run(program, nil)
if err != nil {
fmt.Printf("%v", err)
return
}
fmt.Printf("%T(%v)", output, output)
// Output: int(42)
}
func ExampleAsInt64() {
env := map[string]any{
"rating": 5.5,
}
program, err := expr.Compile("rating", expr.Env(env), expr.AsInt64())
if err != nil {
fmt.Printf("%v", err)
return
}
output, err := expr.Run(program, env)
if err != nil {
fmt.Printf("%v", err)
return
}
fmt.Printf("%v", output.(int64))
// Output: 5
}
func ExampleAsFloat64() {
program, err := expr.Compile("42", expr.AsFloat64())
if err != nil {
fmt.Printf("%v", err)
return
}
output, err := expr.Run(program, nil)
if err != nil {
fmt.Printf("%v", err)
return
}
fmt.Printf("%v", output.(float64))
// Output: 42
}
func ExampleAsFloat64_error() {
_, err := expr.Compile(`!!true`, expr.AsFloat64())
fmt.Printf("%v", err)
// Output: expected float64, but got bool
}
func ExampleWarnOnAny() {
// Arrays always have []any type. The expression return type is any.
// AsInt() instructs compiler to expect int or any, and cast to int,
// if possible. WarnOnAny() instructs to return an error on any type.
_, err := expr.Compile(`[42, true, "yes"][0]`, expr.AsInt(), expr.WarnOnAny())
fmt.Printf("%v", err)
// Output: expected int, but got interface {}
}
func ExampleOperator() {
code := `
Now() > CreatedAt &&
(Now() - CreatedAt).Hours() > 24
`
type Env struct {
CreatedAt time.Time
Now func() time.Time
Sub func(a, b time.Time) time.Duration
After func(a, b time.Time) bool
}
options := []expr.Option{
expr.Env(Env{}),
expr.Operator(">", "After"),
expr.Operator("-", "Sub"),
}
program, err := expr.Compile(code, options...)
if err != nil {
fmt.Printf("%v", err)
return
}
env := Env{
CreatedAt: time.Date(2018, 7, 14, 0, 0, 0, 0, time.UTC),
Now: func() time.Time { return time.Now() },
Sub: func(a, b time.Time) time.Duration { return a.Sub(b) },
After: func(a, b time.Time) bool { return a.After(b) },
}
output, err := expr.Run(program, env)
if err != nil {
fmt.Printf("%v", err)
return
}
fmt.Printf("%v", output)
// Output: true
}
func ExampleOperator_with_decimal() {
type Decimal struct{ N float64 }
code := `A + B - C`
type Env struct {
A, B, C Decimal
Sub func(a, b Decimal) Decimal
Add func(a, b Decimal) Decimal
}
options := []expr.Option{
expr.Env(Env{}),
expr.Operator("+", "Add"),
expr.Operator("-", "Sub"),
}
program, err := expr.Compile(code, options...)
if err != nil {
fmt.Printf("Compile error: %v", err)
return
}
env := Env{
A: Decimal{3},
B: Decimal{2},
C: Decimal{1},
Sub: func(a, b Decimal) Decimal { return Decimal{a.N - b.N} },
Add: func(a, b Decimal) Decimal { return Decimal{a.N + b.N} },
}
output, err := expr.Run(program, env)
if err != nil {
fmt.Printf("%v", err)
return
}
fmt.Printf("%v", output)
// Output: {4}
}
func fib(n int) int {
if n <= 1 {
return n
}
return fib(n-1) + fib(n-2)
}
func ExampleConstExpr() {
code := `[fib(5), fib(3+3), fib(dyn)]`
env := map[string]any{
"fib": fib,
"dyn": 0,
}
options := []expr.Option{
expr.Env(env),
expr.ConstExpr("fib"), // Mark fib func as constant expression.
}
program, err := expr.Compile(code, options...)
if err != nil {
fmt.Printf("%v", err)
return
}
// Only fib(5) and fib(6) calculated on Compile, fib(dyn) can be called at runtime.
env["dyn"] = 7
output, err := expr.Run(program, env)
if err != nil {
fmt.Printf("%v", err)
return
}
fmt.Printf("%v\n", output)
// Output: [5 8 13]
}
func ExampleAllowUndefinedVariables() {
code := `name == nil ? "Hello, world!" : sprintf("Hello, %v!", name)`
env := map[string]any{
"sprintf": fmt.Sprintf,
}
options := []expr.Option{
expr.Env(env),
expr.AllowUndefinedVariables(), // Allow to use undefined variables.
}
program, err := expr.Compile(code, options...)
if err != nil {
fmt.Printf("%v", err)
return
}
output, err := expr.Run(program, env)
if err != nil {
fmt.Printf("%v", err)
return
}
fmt.Printf("%v\n", output)
env["name"] = "you" // Define variables later on.
output, err = expr.Run(program, env)
if err != nil {
fmt.Printf("%v", err)
return
}
fmt.Printf("%v\n", output)
// Output: Hello, world!
// Hello, you!
}
func ExampleAllowUndefinedVariables_zero_value() {
code := `name == "" ? foo + bar : foo + name`
// If environment has different zero values, then undefined variables
// will have it as default value.
env := map[string]string{}
options := []expr.Option{
expr.Env(env),
expr.AllowUndefinedVariables(), // Allow to use undefined variables.
}
program, err := expr.Compile(code, options...)
if err != nil {
fmt.Printf("%v", err)
return
}
env = map[string]string{
"foo": "Hello, ",
"bar": "world!",
}
output, err := expr.Run(program, env)
if err != nil {
fmt.Printf("%v", err)
return
}
fmt.Printf("%v", output)
// Output: Hello, world!
}
func ExampleAllowUndefinedVariables_zero_value_functions() {
code := `words == "" ? Split("foo,bar", ",") : Split(words, ",")`
// Env is map[string]string type on which methods are defined.
env := mock.MapStringStringEnv{}
options := []expr.Option{
expr.Env(env),
expr.AllowUndefinedVariables(), // Allow to use undefined variables.
}
program, err := expr.Compile(code, options...)
if err != nil {
fmt.Printf("%v", err)
return
}
output, err := expr.Run(program, env)
if err != nil {
fmt.Printf("%v", err)
return
}
fmt.Printf("%v", output)
// Output: [foo bar]
}
type patcher struct{}
func (p *patcher) Visit(node *ast.Node) {
switch n := (*node).(type) {
case *ast.MemberNode:
ast.Patch(node, &ast.CallNode{
Callee: &ast.IdentifierNode{Value: "get"},
Arguments: []ast.Node{n.Node, n.Property},
})
}
}
func ExamplePatch() {
program, err := expr.Compile(
`greet.you.world + "!"`,
expr.Patch(&patcher{}),
)
if err != nil {
fmt.Printf("%v", err)
return
}
env := map[string]any{
"greet": "Hello",
"get": func(a, b string) string {
return a + ", " + b
},
}
output, err := expr.Run(program, env)
if err != nil {
fmt.Printf("%v", err)
return
}
fmt.Printf("%v", output)
// Output: Hello, you, world!
}
func ExampleWithContext() {
env := map[string]any{
"fn": func(ctx context.Context, _, _ int) int {
// An infinite loop that can be canceled by context.
for {
select {
case <-ctx.Done():
return 42
}
}
},
"ctx": context.TODO(), // Context should be passed as a variable.
}
program, err := expr.Compile(`fn(1, 2)`,
expr.Env(env),
expr.WithContext("ctx"), // Pass context variable name.
)
if err != nil {
fmt.Printf("%v", err)
return
}
// Cancel context after 100 milliseconds.
ctx, cancel := context.WithTimeout(context.Background(), time.Millisecond*100)
defer cancel()
// After program is compiled, context can be passed to Run.
env["ctx"] = ctx
// Run will return 42 after 100 milliseconds.
output, err := expr.Run(program, env)
if err != nil {
fmt.Printf("%v", err)
return
}
fmt.Printf("%v", output)
// Output: 42
}
func ExampleTimezone() {
program, err := expr.Compile(`now().Location().String()`, expr.Timezone("Asia/Kamchatka"))
if err != nil {
fmt.Printf("%v", err)
return
}
output, err := expr.Run(program, nil)
if err != nil {
fmt.Printf("%v", err)
return
}
fmt.Printf("%v", output)
// Output: Asia/Kamchatka
}
func TestExpr_readme_example(t *testing.T) {
env := map[string]any{
"greet": "Hello, %v!",
"names": []string{"world", "you"},
"sprintf": fmt.Sprintf,
}
code := `sprintf(greet, names[0])`
program, err := expr.Compile(code, expr.Env(env))
require.NoError(t, err)
output, err := expr.Run(program, env)
require.NoError(t, err)
require.Equal(t, "Hello, world!", output)
}
func TestExpr(t *testing.T) {
date := time.Date(2017, time.October, 23, 18, 30, 0, 0, time.UTC)
oneDay, _ := time.ParseDuration("24h")
timeNowPlusOneDay := date.Add(oneDay)
env := mock.Env{
Embed: mock.Embed{},
Ambiguous: "",
Any: nil,
Bool: true,
Float: 0,
Int64: 0,
Int32: 0,
Int: 0,
One: 1,
Two: 2,
Uint32: 0,
String: "string",
BoolPtr: nil,
FloatPtr: nil,
IntPtr: nil,
IntPtrPtr: nil,
StringPtr: nil,
Foo: mock.Foo{
Value: "foo",
Bar: mock.Bar{
Baz: "baz",
},
},
Abstract: nil,
ArrayOfAny: nil,
ArrayOfInt: []int{1, 2, 3, 4, 5},
ArrayOfFoo: []*mock.Foo{{Value: "foo"}, {Value: "bar"}, {Value: "baz"}},
MapOfFoo: nil,
MapOfAny: nil,
FuncParam: nil,
FuncParamAny: nil,
FuncTooManyReturns: nil,
FuncNamed: nil,
NilAny: nil,
NilFn: nil,
NilStruct: nil,
Variadic: func(head int, xs ...int) bool {
sum := 0
for _, x := range xs {
sum += x
}
return head == sum
},
Fast: nil,
Time: date,
TimePlusDay: timeNowPlusOneDay,
Duration: oneDay,
}
tests := []struct {
code string
want any
}{
{
`1`,
1,
},
{
`-.5`,
-.5,
},
{
`true && false || false`,
false,
},
{
`Int == 0 && Int32 == 0 && Int64 == 0 && Float64 == 0 && Bool && String == "string"`,
true,
},
{
`-Int64 == 0`,
true,
},
{
`"a" != "b"`,
true,
},
{
`"a" != "b" || 1 == 2`,
true,
},
{
`Int + 0`,
0,
},
{
`Uint64 + 0`,
0,
},
{
`Uint64 + Int64`,
0,
},
{
`Int32 + Int64`,
0,
},
{
`Float64 + 0`,
float64(0),
},
{
`0 + Float64`,
float64(0),
},
{
`0 <= Float64`,
true,
},
{
`Float64 < 1`,
true,
},
{
`Int < 1`,
true,
},
{
`2 + 2 == 4`,
true,
},
{
`8 % 3`,
2,
},
{
`2 ** 8`,
float64(256),
},
{
`2 ^ 8`,
float64(256),
},
{
`-(2-5)**3-2/(+4-3)+-2`,
float64(23),
},
{
`"hello" + " " + "world"`,
"hello world",
},
{
`0 in -1..1 and 1 in 1..1`,
true,
},
{
`Int in 0..1`,
true,
},
{
`Int32 in 0..1`,
true,
},
{
`Int64 in 0..1`,
true,
},
{
`1 in [1, 2, 3] && "foo" in {foo: 0, bar: 1} && "Bar" in Foo`,
true,
},
{
`1 in [1.5] || 1 not in [1]`,
false,
},
{
`One in 0..1 && Two not in 0..1`,
true,
},
{
`Two not in 0..1`,
true,
},
{
`Two not in 0..1`,
true,
},
{
`-1 not in [1]`,
true,
},
{
`Int32 in [10, 20]`,
false,
},
{
`String matches "s.+"`,
true,
},
{
`String matches ("^" + String + "$")`,
true,
},
{
`'foo' + 'bar' not matches 'foobar'`,
false,
},
{
`"foobar" contains "bar"`,
true,
},
{
`"foobar" startsWith "foo"`,
true,
},
{
`"foobar" endsWith "bar"`,
true,
},
{
`(0..10)[5]`,
5,
},
{
`Foo.Bar.Baz`,
"baz",
},
{
`Add(10, 5) + GetInt()`,
15,
},
{
`Foo.Method().Baz`,
`baz (from Foo.Method)`,
},
{
`Foo.MethodWithArgs("prefix ")`,
"prefix foo",
},
{
`len([1, 2, 3])`,
3,
},
{
`len([1, Two, 3])`,
3,
},
{
`len(["hello", "world"])`,
2,
},
{
`len("hello, world")`,
12,
},
{
`len('北京')`,
2,
},
{
`len('👍🏻')`, // one grapheme cluster, two code points
2,
},
{
`len('👍')`, // one grapheme cluster, one code point
1,
},
{
`len(ArrayOfInt)`,
5,
},
{
`len({a: 1, b: 2, c: 2})`,
3,
},
{
`max([1, 2, 3])`,
3,
},
{
`max(1, 2, 3)`,
3,
},
{
`min([1, 2, 3])`,
1,
},
{
`min(1, 2, 3)`,
1,
},
{
`{foo: 0, bar: 1}`,
map[string]any{"foo": 0, "bar": 1},
},
{
`{foo: 0, bar: 1}`,
map[string]any{"foo": 0, "bar": 1},
},
{
`(true ? 0+1 : 2+3) + (false ? -1 : -2)`,
-1,
},
{
`filter(1..9, {# > 7})`,
[]any{8, 9},
},
{
`map(1..3, {# * #})`,
[]any{1, 4, 9},
},
{
`all(1..3, {# > 0})`,
true,
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