| 1 | package abono |
| 2 | |
| 3 | import ( |
| 4 | "embed" |
| 5 | "fmt" |
| 6 | "io/fs" |
| 7 | "strconv" |
| 8 | "strings" |
| 9 | |
| 10 | "amadan.net/rastrillo/rastrillo" |
| 11 | ) |
| 12 | |
| 13 | //go:embed locales/*.toml |
| 14 | var localesFS embed.FS |
| 15 | |
| 16 | // english is locales/en.toml, decoded once. A malformed file is a build |
| 17 | // bug, so it panics at start-up, as rastrillo's own base catalogs do. |
| 18 | var english = func() rastrillo.Catalog { |
| 19 | data, err := fs.ReadFile(localesFS, "locales/en.toml") |
| 20 | if err != nil { |
| 21 | panic(fmt.Sprintf("abono: catalog en: %v", err)) |
| 22 | } |
| 23 | m, err := decodeCatalog(data) |
| 24 | if err != nil { |
| 25 | panic(fmt.Sprintf("abono: catalog en: %v", err)) |
| 26 | } |
| 27 | return m |
| 28 | }() |
| 29 | |
| 30 | // Catalog is abono's English, the "abono.*" message keys the partials and |
| 31 | // the starter pages use. It is a copy: change it freely. |
| 32 | // |
| 33 | // Merge it into the base catalog you give rastrillo.NewLocales, which sits |
| 34 | // under every locale's own catalog and above nothing but the key itself: |
| 35 | // |
| 36 | // base := rastrillo.BaseCatalog() |
| 37 | // for k, v := range abono.Catalog() { |
| 38 | // base[k] = v |
| 39 | // } |
| 40 | // locs, err := rastrillo.NewLocales(codes, "en", base, appFS) |
| 41 | // |
| 42 | // An app overrides any key, or translates it, in its own |
| 43 | // locales/<code>.toml, where an "abono.*" key wins over this one. A |
| 44 | // locale the app has not translated reads the English. |
| 45 | func Catalog() rastrillo.Catalog { |
| 46 | out := make(rastrillo.Catalog, len(english)) |
| 47 | for k, v := range english { |
| 48 | out[k] = v |
| 49 | } |
| 50 | return out |
| 51 | } |
| 52 | |
| 53 | // decodeCatalog reads rastrillo's flat catalog format: one key = "value" |
| 54 | // per line, # comments and blank lines. rastrillo's own decoder is |
| 55 | // internal to it, so this is the same subset: no tables, a dot in a key |
| 56 | // is just a character, a value is a basic string (with escapes) or a |
| 57 | // literal one. |
| 58 | func decodeCatalog(data []byte) (rastrillo.Catalog, error) { |
| 59 | out := rastrillo.Catalog{} |
| 60 | for i, raw := range strings.Split(string(data), "\n") { |
| 61 | line := strings.TrimSpace(raw) |
| 62 | if line == "" || strings.HasPrefix(line, "#") { |
| 63 | continue |
| 64 | } |
| 65 | key, rest, ok := strings.Cut(line, "=") |
| 66 | key = strings.TrimSpace(key) |
| 67 | if !ok || key == "" || strings.ContainsAny(key, " \t[]\"'") { |
| 68 | return nil, fmt.Errorf("line %d: want key = \"value\"", i+1) |
| 69 | } |
| 70 | val, err := catalogValue(strings.TrimSpace(rest)) |
| 71 | if err != nil { |
| 72 | return nil, fmt.Errorf("line %d: %w", i+1, err) |
| 73 | } |
| 74 | if _, dup := out[key]; dup { |
| 75 | return nil, fmt.Errorf("line %d: duplicate key %q", i+1, key) |
| 76 | } |
| 77 | out[key] = val |
| 78 | } |
| 79 | return out, nil |
| 80 | } |
| 81 | |
| 82 | // catalogValue reads a quoted string, then allows only a # comment after it. |
| 83 | func catalogValue(s string) (string, error) { |
| 84 | var end int |
| 85 | switch { |
| 86 | case strings.HasPrefix(s, `"`): |
| 87 | end = -1 |
| 88 | for i := 1; i < len(s); i++ { |
| 89 | if s[i] == '\\' { |
| 90 | i++ |
| 91 | } else if s[i] == '"' { |
| 92 | end = i |
| 93 | break |
| 94 | } |
| 95 | } |
| 96 | case strings.HasPrefix(s, "'"): |
| 97 | end = strings.Index(s[1:], "'") + 1 |
| 98 | if end == 0 { |
| 99 | end = -1 |
| 100 | } |
| 101 | default: |
| 102 | return "", fmt.Errorf("a value must be a quoted string") |
| 103 | } |
| 104 | if end < 0 { |
| 105 | return "", fmt.Errorf("unterminated string") |
| 106 | } |
| 107 | if tail := strings.TrimSpace(s[end+1:]); tail != "" && !strings.HasPrefix(tail, "#") { |
| 108 | return "", fmt.Errorf("unexpected %q after the string", tail) |
| 109 | } |
| 110 | if s[0] == '\'' { |
| 111 | return s[1:end], nil |
| 112 | } |
| 113 | // TOML's basic-string escapes are a subset of Go's. |
| 114 | return strconv.Unquote(s[:end+1]) |
| 115 | } |
| 116 | |
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