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go.tools/go/types: Provide explicit type checker Error.

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R=adonovan
CC=golang-dev
https://golang.org/cl/20400044
This commit is contained in:
Robert Griesemer 2013-10-31 12:01:00 -07:00
parent 03e3f0cf81
commit fb0632eb7d
2 changed files with 19 additions and 5 deletions
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19
go/types/api.go
View File

@ -23,6 +23,7 @@
package types
import (
"fmt"
"go/ast"
"go/token"
@ -44,6 +45,20 @@ func Check(path string, fset *token.FileSet, files []*ast.File) (*Package, error
return pkg, nil
}
// An Error describes a type-checking error;
// it implements the error interface.
type Error struct {
Fset *token.FileSet // file set for interpretation of Pos
Pos token.Pos // error position
Msg string // error message
}
// Error returns an error string formatted as follows:
// filename:line:column: message
func (err Error) Error() string {
return fmt.Sprintf("%s: %s", err.Fset.Position(err.Pos), err.Msg)
}
// A Config specifies the configuration for type checking.
// The zero value for Config is a ready-to-use default configuration.
type Config struct {
@ -66,9 +81,7 @@ type Config struct {
Packages map[string]*Package
// If Error != nil, it is called with each error found
// during type checking. The error strings of errors with
// detailed position information are formatted as follows:
// filename:line:column: message
// during type checking; err has dynamic type Error.
Error func(err error)
// If Import != nil, it is called for each imported package.

5
go/types/errors.go
View File

@ -53,7 +53,8 @@ func (check *checker) dump(format string, args ...interface{}) {
fmt.Println(check.sprintf(format, args...))
}
func (check *checker) err(err error) {
func (check *checker) err(pos token.Pos, msg string) {
err := Error{check.fset, pos, msg}
if check.firstErr == nil {
check.firstErr = err
}
@ -65,7 +66,7 @@ func (check *checker) err(err error) {
}
func (check *checker) errorf(pos token.Pos, format string, args ...interface{}) {
check.err(fmt.Errorf("%s: %s", check.fset.Position(pos), check.sprintf(format, args...)))
check.err(pos, check.sprintf(format, args...))
}
func (check *checker) invalidAST(pos token.Pos, format string, args ...interface{}) {