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// Copyright 2018 The Bazel Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package res
import (
"errors"
"fmt"
"path"
"strings"
)
// ErrNotResPath the provided path does not seem to point to a resource file
var ErrNotResPath = errors.New("Not a resource path")
// ErrSkipResPath the provided path does needs to be skipped.
var ErrSkipResPath = errors.New("resource path that does needs to be skipped")
// PathInfo contains all information about a resource that can be derived from its location on the filesystem.
type PathInfo struct {
Path string
ResDir string
TypeDir string
Type Type
Qualifier string
Density Density
}
// ParsePath converts a path string into a PathInfo object if the string points to a resource file.
func ParsePath(p string) (PathInfo, error) {
parent := path.Dir(p)
resDir := path.Dir(parent)
typeDir := path.Base(parent)
if strings.HasPrefix(path.Base(p), ".") {
return PathInfo{}, ErrSkipResPath
}
resType, err := ParseValueOrType(strings.Split(typeDir, "-")[0])
qualifier := extractQualifier(typeDir)
if err != nil {
return PathInfo{}, ErrNotResPath
}
var density Density
for _, q := range strings.Split(qualifier, "-") {
var err error
density, err = ParseDensity(q)
if err != nil {
return PathInfo{}, err
}
if density != UnspecifiedDensity {
break
}
}
return PathInfo{
Path: p,
ResDir: resDir,
TypeDir: typeDir,
Type: resType,
Qualifier: qualifier,
Density: density,
}, nil
}
// MakePathInfo converts a path string into a PathInfo object.
func MakePathInfo(p string) (*PathInfo, error) {
pi, err := ParsePath(p)
if err != nil {
return nil, fmt.Errorf("ParsePath failed to parse %q: %v", p, err)
}
return &pi, nil
}
// MakePathInfos converts a list of path strings into a list of PathInfo objects.
func MakePathInfos(paths []string) ([]*PathInfo, error) {
pis := make([]*PathInfo, 0, len(paths))
for _, p := range paths {
if strings.HasPrefix(path.Base(p), ".") {
continue
}
pi, err := MakePathInfo(p)
if err != nil {
return nil, err
}
pis = append(pis, pi)
}
return pis, nil
}
func extractQualifier(s string) string {
base := path.Base(s)
parts := strings.SplitN(base, "-", 2)
if len(parts) > 1 {
return parts[1]
}
return ""
}
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