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template_test.go
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template_test.go
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package yaegi_template
import (
"io"
"reflect"
"testing"
"bytes"
"fmt"
"strconv"
"os"
"path/filepath"
"io/ioutil"
"github.com/stretchr/testify/require"
"github.com/traefik/yaegi/interp"
"github.com/traefik/yaegi/stdlib"
)
func TestExec(t *testing.T) {
tests := []struct {
Name string
Options interp.Options
Use []interp.Exports
Imports []Import
Template string
ExpectOutput string
ExpectError string
}{
{
"Hello Yaegi",
interp.Options{},
[]interp.Exports{stdlib.Symbols},
nil,
`<html><$print("Hello Yaegi")$></html>`,
`<html>Hello Yaegi</html>`,
"",
},
{
"Error",
interp.Options{},
[]interp.Exports{stdlib.Symbols},
nil,
`<$ Hello $>`,
"",
"error during execution of\n1\t Hello \n: 1:29: undefined: Hello",
},
{
"Import",
interp.Options{},
[]interp.Exports{stdlib.Symbols},
nil,
`<$import "net/url"$><$print(url.PathEscape("Hello World"))$>`,
"Hello%20World",
"",
},
}
for i := range tests {
test := tests[i]
t.Run(test.Name, func(t *testing.T) {
template := MustNew(test.Options, test.Use...).MustImport(test.Imports...).MustParseString(test.Template)
var buf bytes.Buffer
n, err := template.Exec(&buf, nil)
if test.ExpectError == "" {
require.NoError(t, err)
} else {
require.EqualError(t, err, test.ExpectError)
}
require.Equal(t, test.ExpectOutput, buf.String())
require.Len(t, test.ExpectOutput, n)
})
}
}
func TestExecWithContext(t *testing.T) {
type User struct {
ID int
Name string
}
tests := []struct {
Name string
Options interp.Options
Use []interp.Exports
Imports []Import
Template string
ContextRun1 interface{}
ExpectContextAfterRun1 interface{}
ExpectOutputRun1 string
ContextRun2 interface{}
ExpectContextAfterRun2 interface{}
ExpectOutputRun2 string
ExpectError string
}{
{
"Struct",
interp.Options{},
[]interp.Exports{stdlib.Symbols},
[]Import{{Name: "", Path: "fmt"}},
`Hello <$fmt.Printf("%s (%d)", context.Name, context.ID)$>`,
User{10, "Yaegi"},
User{10, "Yaegi"},
`Hello Yaegi (10)`,
User{11, "Joe"},
User{11, "Joe"},
`Hello Joe (11)`,
"",
},
{
"PtrStruct",
interp.Options{},
[]interp.Exports{stdlib.Symbols},
[]Import{{Name: "", Path: "fmt"}},
`Hello <$fmt.Printf("%s (%d)", context.Name, context.ID)$>`,
&User{10, "Yaegi"},
&User{10, "Yaegi"},
`Hello Yaegi (10)`,
&User{11, "Joe"},
&User{11, "Joe"},
`Hello Joe (11)`,
"",
},
{
"Map",
interp.Options{},
[]interp.Exports{stdlib.Symbols},
[]Import{{Name: "", Path: "fmt"}},
`<$fmt.Printf("%d %s", context["Foo"], context["Bar"])$>`,
map[string]interface{}{"Foo": 10, "Bar": "Yaegi"},
map[string]interface{}{"Foo": 10, "Bar": "Yaegi"},
`10 Yaegi`,
map[string]interface{}{"Foo": 11, "Bar": "Joe"},
map[string]interface{}{"Foo": 11, "Bar": "Joe"},
`11 Joe`,
"",
},
{
"Package",
interp.Options{},
[]interp.Exports{stdlib.Symbols},
[]Import{{Name: "", Path: "fmt"}},
`<$
package main
func main() {
fmt.Printf("%d %s", context["Foo"], context["Bar"])
}
$>`,
map[string]interface{}{"Foo": 10, "Bar": "Yaegi"},
map[string]interface{}{"Foo": 10, "Bar": "Yaegi"},
`10 Yaegi`,
map[string]interface{}{"Foo": 11, "Bar": "Joe"},
map[string]interface{}{"Foo": 11, "Bar": "Joe"},
`11 Joe`,
"",
},
{
"Package (Indented)",
interp.Options{},
[]interp.Exports{stdlib.Symbols},
[]Import{{Name: "", Path: "fmt"}},
`<$
package main
func main() {
fmt.Printf("%d %s", context["Foo"], context["Bar"])
}
$>`,
map[string]interface{}{"Foo": 10, "Bar": "Yaegi"},
map[string]interface{}{"Foo": 10, "Bar": "Yaegi"},
`10 Yaegi`,
map[string]interface{}{"Foo": 11, "Bar": "Joe"},
map[string]interface{}{"Foo": 11, "Bar": "Joe"},
`11 Joe`,
"",
},
}
for i := range tests {
test := tests[i]
t.Run(test.Name, func(t *testing.T) {
template := MustNew(test.Options, test.Use...).MustImport(test.Imports...).MustParseString(test.Template)
var buf bytes.Buffer
n, err := template.Exec(&buf, test.ContextRun1)
if test.ExpectError == "" {
require.NoError(t, err)
} else {
require.Error(t, err, test.ExpectError)
}
require.Equal(t, test.ExpectOutputRun1, buf.String())
require.Equal(t, test.ExpectContextAfterRun1, test.ContextRun1)
require.Len(t, test.ExpectOutputRun1, n)
// run again with the second context
buf.Reset()
n, err = template.Exec(&buf, test.ContextRun2)
if test.ExpectError == "" {
require.NoError(t, err)
} else {
require.Error(t, err, test.ExpectError)
}
require.Equal(t, test.ExpectOutputRun2, buf.String())
require.Equal(t, test.ExpectContextAfterRun2, test.ContextRun2)
require.Len(t, test.ExpectOutputRun2, n)
})
}
}
func TestTemplate_MustParse(t *testing.T) {
template := MustNew(interp.Options{}, stdlib.Symbols).
MustParse(bytes.NewBufferString(`Hello <$ print("Yaegi") $>`))
var buf bytes.Buffer
if _, err := template.Exec(&buf, nil); err != nil {
t.Fatal("exec failed")
}
if buf.String() != "Hello Yaegi" {
t.Fatalf(`expected "Hello Yaegi", got %#v`, buf.String())
}
}
func TestMultiExec(t *testing.T) {
type MessageContext struct {
Message string
}
var templates []*Template
for i := 0; i < 3; i++ {
templates = append(templates,
MustNew(interp.Options{}, stdlib.Symbols).
MustImport(Import{Name: "", Path: "fmt"}).
MustParseString(`<$fmt.Printf("Hello `+strconv.Itoa(i)+` %s", context.Message)$>`),
)
}
run := func(i int) func(t *testing.T) {
return func(t *testing.T) {
t.Parallel()
templateIndex := i % len(templates)
msg := MessageContext{Message: strconv.Itoa(i)}
var buf bytes.Buffer
templates[templateIndex].MustExec(&buf, msg)
require.Equal(t, fmt.Sprintf("Hello %d %d", templateIndex, i), buf.String())
}
}
for i := 0; i < 1000; i++ {
t.Run(strconv.Itoa(i), run(i))
}
}
func TestFmtSprintf(t *testing.T) {
template := MustNew(interp.Options{}, stdlib.Symbols).
MustImport(Import{Name: "", Path: "fmt"}).
MustParseString(`<$fmt.Printf(fmt.Sprintf("Hello %s", "World"))$>`)
var buf bytes.Buffer
template.MustExec(&buf, nil)
require.Equal(t, "Hello World", buf.String())
}
func TestPanic(t *testing.T) {
template := MustNew(interp.Options{}, stdlib.Symbols).
MustParseString(`<$panic("Oh no")$>`)
var buf bytes.Buffer
_, err := template.Exec(&buf, nil)
require.EqualError(t, err, "error during execution of\n1\tpanic(\"Oh no\")\n: Oh no")
}
func TestNoStartOrEnd(t *testing.T) {
template := MustNew(interp.Options{}, stdlib.Symbols).
MustImport(Import{Name: "", Path: "fmt"})
template.StartTokens = []rune{}
template.EndTokens = []rune{}
template.MustParseString(`fmt.Printf(fmt.Sprintf("Hello %s", "World"))`)
var buf bytes.Buffer
template.MustExec(&buf, nil)
require.Equal(t, "Hello World", buf.String())
}
func TestImport(t *testing.T) {
// create sample package
tmp, err := ioutil.TempDir("", "")
if err != nil {
t.Fatalf("unable to create temp dir: %v", err)
}
defer os.RemoveAll(tmp)
srcPath := filepath.Join(tmp, "src", "world")
if err = os.MkdirAll(srcPath, 0777); err != nil {
t.Fatalf("unable to create temp dir /src/world: %v", err)
}
err = ioutil.WriteFile(filepath.Join(srcPath, "world.go"), []byte(`
package world
func World() string {
return "World"
}`), 0777)
if err != nil {
t.Fatalf("unable to create world.go: %v", err)
}
t.Run("simple", func(t *testing.T) {
template := MustNew(interp.Options{
GoPath: tmp,
}, stdlib.Symbols).
MustImport(Import{Name: "", Path: "fmt"})
template.StartTokens = []rune{}
template.EndTokens = []rune{}
template.MustParseString(`
import "world"
fmt.Printf(fmt.Sprintf("Hello %s", world.World()))`)
var buf bytes.Buffer
template.MustExec(&buf, nil)
require.Equal(t, "Hello World", buf.String())
buf.Reset()
template.MustExec(&buf, nil)
require.Equal(t, "Hello World", buf.String())
})
t.Run("multi import", func(t *testing.T) {
template := MustNew(interp.Options{
GoPath: tmp,
}, stdlib.Symbols).
MustImport(Import{Name: "", Path: "fmt"})
template.StartTokens = []rune{}
template.EndTokens = []rune{}
template.MustParseString(`
import (
"fmt"
"world"
)
fmt.Printf(fmt.Sprintf("Hello %s", world.World()))`)
var buf bytes.Buffer
template.MustExec(&buf, nil)
require.Equal(t, "Hello World", buf.String())
buf.Reset()
template.MustExec(&buf, nil)
require.Equal(t, "Hello World", buf.String())
})
t.Run("multi import", func(t *testing.T) {
template := MustNew(interp.Options{
GoPath: tmp,
}, stdlib.Symbols)
template.StartTokens = []rune{}
template.EndTokens = []rune{}
template.MustParseString(`
import (
"fmt"
)
import (
"world"
)
fmt.Printf(fmt.Sprintf("Hello %s", world.World()))`)
var buf bytes.Buffer
template.MustExec(&buf, nil)
require.Equal(t, "Hello World", buf.String())
buf.Reset()
template.MustExec(&buf, nil)
require.Equal(t, "Hello World", buf.String())
})
t.Run("alias import", func(t *testing.T) {
template := MustNew(interp.Options{
GoPath: tmp,
}, stdlib.Symbols)
template.StartTokens = []rune{}
template.EndTokens = []rune{}
template.MustParseString(`
import (
"fmt"
w "world"
)
fmt.Printf(fmt.Sprintf("Hello %s", w.World()))`)
var buf bytes.Buffer
template.MustExec(&buf, nil)
require.Equal(t, "Hello World", buf.String())
buf.Reset()
template.MustExec(&buf, nil)
require.Equal(t, "Hello World", buf.String())
})
t.Run("alias dot import", func(t *testing.T) {
template := MustNew(interp.Options{
GoPath: tmp,
}, stdlib.Symbols)
template.StartTokens = []rune{}
template.EndTokens = []rune{}
template.MustParseString(`
import (
"fmt"
. "world"
)
fmt.Printf(fmt.Sprintf("Hello %s", World()))`)
var buf bytes.Buffer
template.MustExec(&buf, nil)
require.Equal(t, "Hello World", buf.String())
buf.Reset()
template.MustExec(&buf, nil)
require.Equal(t, "Hello World", buf.String())
})
t.Run("package", func(t *testing.T) {
template := MustNew(interp.Options{
GoPath: tmp,
}, stdlib.Symbols).
MustImport(Import{Name: "", Path: "fmt"})
template.StartTokens = []rune{}
template.EndTokens = []rune{}
template.MustParseString(`
package main
import "world"
func main() {
fmt.Printf(fmt.Sprintf("Hello %s", world.World()))
}`)
var buf bytes.Buffer
template.MustExec(&buf, nil)
require.Equal(t, "Hello World", buf.String())
buf.Reset()
template.MustExec(&buf, nil)
require.Equal(t, "Hello World", buf.String())
})
}
func TestImplicitReturn(t *testing.T) {
tests := []struct {
key string
value interface{}
expect string
}{
{
"Bool",
false,
"false",
},
{
"Int",
1,
"1",
},
{
"Uint",
uint(1),
"1",
},
{
"Float",
1.2,
"1.2",
},
{
"String",
"Foo",
"Foo",
},
{
"Func",
func() {},
"",
},
}
for _, test := range tests {
t.Run(test.key, func(t *testing.T) {
template := MustNew(interp.Options{}, stdlib.Symbols)
template.StartTokens = nil
template.EndTokens = nil
template.MustParseString(fmt.Sprintf(`context["%s"]`, test.key))
var buf bytes.Buffer
template.MustExec(&buf, map[string]interface{}{test.key: test.value})
require.Equal(t, test.expect, buf.String())
})
}
}
func TestTemplate_LazyParse(t *testing.T) {
buf := bytes.NewReader([]byte(`Hello <$ print("World") $>`))
MustNew(DefaultOptions(), DefaultSymbols()...).MustLazyParse(buf)
pos, err := buf.Seek(0, io.SeekCurrent)
require.NoError(t, err)
require.Equal(t, int64(0), pos)
}
func TestTemplate_ExecWithoutParse(t *testing.T) {
_, err := MustNew(DefaultOptions(), DefaultSymbols()...).Exec(nil, nil)
require.EqualError(t, err, "template was never parsed")
}
func TestTemplate_ExecToNilWriter(t *testing.T) {
buf := bytes.NewReader([]byte(`Hello <$ print("World") $>`))
MustNew(DefaultOptions(), DefaultSymbols()...).MustLazyParse(buf).MustExec(nil, nil)
}
func TestTemplate_Import(t *testing.T) {
t.Run("single", func(t *testing.T) {
tm := MustNew(DefaultOptions(), DefaultSymbols()...).
MustParseString(`Hello <$ print(http.StatusOK) $>`).
MustImport(Import{
Path: "net/http",
})
var buf bytes.Buffer
tm.MustExec(&buf, nil)
require.Equal(t, "Hello 200", buf.String())
})
t.Run("double import", func(t *testing.T) {
tm := MustNew(DefaultOptions(), DefaultSymbols()...).
MustParseString(`Hello <$ print(http.StatusOK) $>`).
MustImport(Import{
Path: "net/http",
}).
MustImport(Import{
Path: "net/http",
})
var buf bytes.Buffer
tm.MustExec(&buf, nil)
require.Equal(t, "Hello 200", buf.String())
})
t.Run("alias import", func(t *testing.T) {
tm := MustNew(DefaultOptions(), DefaultSymbols()...).
MustParseString(`Hello <$ print(h.StatusOK) $>`).
MustImport(Import{
Name: "h",
Path: "net/http",
}).
MustImport(Import{
Path: "net/http",
})
var buf bytes.Buffer
tm.MustExec(&buf, nil)
require.Equal(t, "Hello 200", buf.String())
})
t.Run("import before parse", func(t *testing.T) {
tm := MustNew(DefaultOptions(), DefaultSymbols()...).
MustImport(Import{
Path: "net/http",
}).
MustParseString(`Hello <$ print(http.StatusOK) $>`)
var buf bytes.Buffer
tm.MustExec(&buf, nil)
require.Equal(t, "Hello 200", buf.String())
})
}
func TestTemplateWithAdditionalSymbols(t *testing.T) {
t.Run("using New+Import", func(t *testing.T) {
t.Run("separate namespace", func(t *testing.T) {
var buf bytes.Buffer
MustNew(
DefaultOptions(),
append(DefaultSymbols(), interp.Exports{
"ext/ext": map[string]reflect.Value{
"Foo": reflect.ValueOf(func() string {
return "foo"
}),
},
})...).
MustImport(Import{
Path: "ext",
}).
MustParseString(`Hello <$ print(ext.Foo()) $>`).
MustExec(&buf, nil)
require.Equal(t, "Hello foo", buf.String())
})
t.Run("in own namespace (dot import)", func(t *testing.T) {
var buf bytes.Buffer
MustNew(
DefaultOptions(),
append(DefaultSymbols(), interp.Exports{
"ext/ext": map[string]reflect.Value{
"Foo": reflect.ValueOf(func() string {
return "foo"
}),
},
})...).
MustImport(Import{
Name: ".",
Path: "ext",
}).
MustParseString(`Hello <$ print(Foo()) $>`).
MustExec(&buf, nil)
require.Equal(t, "Hello foo", buf.String())
})
t.Run("in own namespace (private dot import)", func(t *testing.T) {
var buf bytes.Buffer
MustNew(
DefaultOptions(),
append(DefaultSymbols(), interp.Exports{
"ext/ext": map[string]reflect.Value{
"foo": reflect.ValueOf(func() string {
return "foo"
}),
},
})...).
MustImport(Import{
Name: ".",
Path: "ext",
}).
MustParseString(`Hello <$ print(foo()) $>`).
MustExec(&buf, nil)
require.Equal(t, "Hello foo", buf.String())
})
})
t.Run("Use() func", func(t *testing.T) {
t.Run("separate namespace", func(t *testing.T) {
var buf bytes.Buffer
MustNew(
DefaultOptions(),
DefaultSymbols()...).
MustUse(interp.Exports{
"ext/ext": map[string]reflect.Value{
"Foo": reflect.ValueOf(func() string {
return "foo"
}),
},
}).
MustImport(Import{Path: "ext"}).
MustParseString(`Hello <$ print(ext.Foo()) $>`).
MustExec(&buf, nil)
require.Equal(t, "Hello foo", buf.String())
})
t.Run("in own namespace (dot import)", func(t *testing.T) {
var buf bytes.Buffer
MustNew(
DefaultOptions(),
DefaultSymbols()...).
MustUse(interp.Exports{
"ext/ext": map[string]reflect.Value{
"Foo": reflect.ValueOf(func() string {
return "foo"
}),
},
}).
MustImport(Import{Name: ".", Path: "ext"}).
MustParseString(`Hello <$ print(Foo()) $>`).
MustExec(&buf, nil)
require.Equal(t, "Hello foo", buf.String())
})
t.Run("in own namespace (private dot import)", func(t *testing.T) {
var buf bytes.Buffer
MustNew(
DefaultOptions(),
DefaultSymbols()...).
MustUse(interp.Exports{
"ext/ext": map[string]reflect.Value{
"foo": reflect.ValueOf(func() string {
return "foo"
}),
},
}).
MustImport(Import{Name: ".", Path: "ext"}).
MustParseString(`Hello <$ print(foo()) $>`).
MustExec(&buf, nil)
require.Equal(t, "Hello foo", buf.String())
})
})
}
func TestMultiParts(t *testing.T) {
t.Run("single line", func(t *testing.T) {
template := MustNew(interp.Options{}, stdlib.Symbols).
MustParseString(`Hello <$ if context.Name == "" { $>Unknown<$ } else { print(context.Name) } $>`)
type Context struct {
Name string
}
var buf bytes.Buffer
template.MustExec(&buf, Context{Name: "Joe"})
require.Equal(t, "Hello Joe", buf.String())
buf.Reset()
template.MustExec(&buf, Context{Name: ""})
require.Equal(t, "Hello Unknown", buf.String())
})
t.Run("multi line", func(t *testing.T) {
template := MustNew(interp.Options{}, stdlib.Symbols).
MustParseString(`Hello
<$-
print(" ")
if context.Name == "" { -$>
Unknown
<$- } else {
print(context.Name)
} -$>`)
type Context struct {
Name string
}
var buf bytes.Buffer
template.MustExec(&buf, Context{Name: "Joe"})
require.Equal(t, "Hello Joe", buf.String())
buf.Reset()
template.MustExec(&buf, Context{Name: ""})
require.Equal(t, "Hello Unknown", buf.String())
})
t.Run("multi line - html", func(t *testing.T) {
template := MustNew(interp.Options{}, stdlib.Symbols).
MustParseString(`<ul>
<$-
for _, name := range context.Names {
$><li><$ print(name) $></li><$
}
-$>
</ul>`)
type Context struct {
Names []string
}
var buf bytes.Buffer
template.MustExec(&buf, Context{Names: []string{"Alice", "Joe"}})
require.Equal(t, "<ul><li>Alice</li><li>Joe</li></ul>", buf.String())
})
}