forked from clipperhouse/typewriter
/
package.go
117 lines (94 loc) · 2.35 KB
/
package.go
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package typewriter
import (
"fmt"
"go/ast"
"go/token"
"strings"
// gcimporter implements Import for gc-generated files
"go/types"
_ "golang.org/x/tools/go/gcimporter15"
)
type evaluator interface {
Eval(string) (Type, error)
}
func NewPackage(path, name string) *Package {
return &Package{
types.NewPackage(path, name),
token.NewFileSet(),
[]Type{},
}
}
type Package struct {
*types.Package
fset *token.FileSet
Types []Type
}
type TypeCheckError struct {
err error
ignored bool
}
func (t *TypeCheckError) Error() string {
var result string
if t.ignored {
result += "[ignored] "
}
return result + t.err.Error()
}
func (t *TypeCheckError) addPos(fset *token.FileSet, pos token.Pos) {
// some errors come with empty pos
err := strings.TrimLeft(t.err.Error(), ":- ")
// prepend position information (file name, line, column)
t.err = fmt.Errorf("%s: %s", fset.Position(pos), err)
}
func combine(ts []*TypeCheckError) error {
if len(ts) == 0 {
return nil
}
var errs []string
for _, t := range ts {
errs = append(errs, t.Error())
}
return fmt.Errorf(strings.Join(errs, "\n"))
}
func getPackage(fset *token.FileSet, a *ast.Package, conf *Config) (*Package, *TypeCheckError) {
// pull map into a slice
var files []*ast.File
for _, f := range a.Files {
files = append(files, f)
}
config := types.Config{
DisableUnusedImportCheck: true,
IgnoreFuncBodies: true,
}
if conf.IgnoreTypeCheckErrors {
// no-op allows type checking to proceed in presence of errors
// https://godoc.org/golang.org/x/tools/go/types#Config
config.Error = func(err error) {}
}
typesPkg, err := config.Check(a.Name, fset, files, nil)
p := &Package{typesPkg, fset, []Type{}}
if err != nil {
return p, &TypeCheckError{err, conf.IgnoreTypeCheckErrors}
}
return p, nil
}
func (p *Package) Eval(name string) (Type, error) {
var result Type
t, err := types.Eval(p.fset, p.Package, token.NoPos, name)
if err != nil {
return result, err
}
result = Type{
Pointer: isPointer(t.Type),
Name: strings.TrimLeft(name, Pointer(true).String()), // trims the * if it exists
comparable: isComparable(t.Type),
numeric: isNumeric(t.Type),
ordered: isOrdered(t.Type),
Type: t.Type,
}
if isInvalid(t.Type) {
err := fmt.Errorf("invalid type: %s", name)
return result, &TypeCheckError{err, false}
}
return result, nil
}