| // Copyright 2017 The Wuffs Authors. |
| // |
| // 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 |
| // |
| // https://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 generate |
| |
| import ( |
| "flag" |
| "fmt" |
| "io/ioutil" |
| "os" |
| "path/filepath" |
| "strings" |
| |
| "github.com/google/wuffs/lang/check" |
| "github.com/google/wuffs/lang/parse" |
| "github.com/google/wuffs/lang/wuffsroot" |
| |
| a "github.com/google/wuffs/lang/ast" |
| t "github.com/google/wuffs/lang/token" |
| ) |
| |
| type Generator func(packageName string, tm *t.Map, c *check.Checker, files []*a.File) ([]byte, error) |
| |
| func Do(flags *flag.FlagSet, args []string, g Generator) error { |
| packageName := flags.String("package_name", "", "the package name of the Wuffs input code") |
| if err := flags.Parse(args); err != nil { |
| return err |
| } |
| out := []byte(nil) |
| |
| if *packageName == "base" && len(flags.Args()) == 0 { |
| var err error |
| out, err = g("base", nil, nil, nil) |
| if err != nil { |
| return err |
| } |
| |
| } else { |
| pkgName := checkPackageName(*packageName) |
| if pkgName == "" { |
| return fmt.Errorf("prohibited package name %q", *packageName) |
| } |
| |
| tm := &t.Map{} |
| files, err := parseFiles(tm, flags.Args()) |
| if err != nil { |
| return err |
| } |
| |
| c, err := check.Check(tm, files, resolveUse) |
| if err != nil { |
| return err |
| } |
| |
| out, err = g(pkgName, tm, c, files) |
| if err != nil { |
| return err |
| } |
| } |
| |
| _, err := os.Stdout.Write(out) |
| return err |
| } |
| |
| func checkPackageName(s string) string { |
| allUnderscores := true |
| for i := 0; i < len(s); i++ { |
| c := s[i] |
| if ('A' <= c && c <= 'Z') || ('a' <= c && c <= 'z') || (c == '_') || ('0' <= c && c <= '9') { |
| allUnderscores = allUnderscores && c == '_' |
| } else { |
| return "" |
| } |
| } |
| if allUnderscores { |
| return "" |
| } |
| s = strings.ToLower(s) |
| // Blacklist certain package names. |
| switch s { |
| case "base", "base_private", "base_private_header", "base_public", "base_public_header", |
| "config", "implementation", "include_guard", "initialize", "version": |
| return "" |
| } |
| return s |
| } |
| |
| func parseFiles(tm *t.Map, filenames []string) (files []*a.File, err error) { |
| if len(filenames) == 0 { |
| const filename = "stdin" |
| src, err := ioutil.ReadAll(os.Stdin) |
| if err != nil { |
| return nil, err |
| } |
| tokens, _, err := t.Tokenize(tm, filename, src) |
| if err != nil { |
| return nil, err |
| } |
| f, err := parse.Parse(tm, filename, tokens, nil) |
| if err != nil { |
| return nil, err |
| } |
| return []*a.File{f}, nil |
| } |
| return ParseFiles(tm, filenames, nil) |
| } |
| |
| func ParseFiles(tm *t.Map, filenames []string, opts *parse.Options) (files []*a.File, err error) { |
| for _, filename := range filenames { |
| src, err := ioutil.ReadFile(filename) |
| if err != nil { |
| return nil, err |
| } |
| tokens, _, err := t.Tokenize(tm, filename, src) |
| if err != nil { |
| return nil, err |
| } |
| f, err := parse.Parse(tm, filename, tokens, opts) |
| if err != nil { |
| return nil, err |
| } |
| files = append(files, f) |
| } |
| return files, nil |
| } |
| |
| func resolveUse(usePath string) ([]byte, error) { |
| wuffsRoot, err := wuffsroot.Value() |
| if err != nil { |
| return nil, err |
| } |
| return ioutil.ReadFile(filepath.Join(wuffsRoot, "gen", "wuffs", filepath.FromSlash(usePath))) |
| } |