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// Copyright 2018 The Bazel Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package starlarkstruct_test
import (
"fmt"
"path/filepath"
"testing"
"go.starlark.net/starlark"
"go.starlark.net/starlarkstruct"
"go.starlark.net/starlarktest"
)
func Test(t *testing.T) {
testdata := starlarktest.DataFile("starlarkstruct", ".")
thread := &starlark.Thread{Load: load}
starlarktest.SetReporter(thread, t)
filename := filepath.Join(testdata, "testdata/struct.star")
predeclared := starlark.StringDict{
"struct": starlark.NewBuiltin("struct", starlarkstruct.Make),
"gensym": starlark.NewBuiltin("gensym", gensym),
}
if _, err := starlark.ExecFile(thread, filename, nil, predeclared); err != nil {
if err, ok := err.(*starlark.EvalError); ok {
t.Fatal(err.Backtrace())
}
t.Fatal(err)
}
}
// load implements the 'load' operation as used in the evaluator tests.
func load(thread *starlark.Thread, module string) (starlark.StringDict, error) {
if module == "assert.star" {
return starlarktest.LoadAssertModule()
}
return nil, fmt.Errorf("load not implemented")
}
// gensym is a built-in function that generates a unique symbol.
func gensym(thread *starlark.Thread, _ *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
var name string
if err := starlark.UnpackArgs("gensym", args, kwargs, "name", &name); err != nil {
return nil, err
}
return &symbol{name: name}, nil
}
// A symbol is a distinct value that acts as a constructor of "branded"
// struct instances, like a class symbol in Python or a "provider" in Bazel.
type symbol struct{ name string }
var _ starlark.Callable = (*symbol)(nil)
func (sym *symbol) Name() string { return sym.name }
func (sym *symbol) String() string { return sym.name }
func (sym *symbol) Type() string { return "symbol" }
func (sym *symbol) Freeze() {} // immutable
func (sym *symbol) Truth() starlark.Bool { return starlark.True }
func (sym *symbol) Hash() (uint32, error) { return 0, fmt.Errorf("unhashable: %s", sym.Type()) }
func (sym *symbol) CallInternal(thread *starlark.Thread, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
if len(args) > 0 {
return nil, fmt.Errorf("%s: unexpected positional arguments", sym)
}
return starlarkstruct.FromKeywords(sym, kwargs), nil
}
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