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Diffstat (limited to 'modules/mahonia/fallback.go')
| -rw-r--r-- | modules/mahonia/fallback.go | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/modules/mahonia/fallback.go b/modules/mahonia/fallback.go new file mode 100644 index 0000000000..27259c5d79 --- /dev/null +++ b/modules/mahonia/fallback.go @@ -0,0 +1,19 @@ +package mahonia + +// FallbackDecoder combines a series of Decoders into one. +// If the first Decoder returns a status of INVALID_CHAR, the others are tried as well. +// +// Note: if the text to be decoded ends with a sequence of bytes that is not a valid character in the first charset, +// but it could be the beginning of a valid character, the FallbackDecoder will give a status of NO_ROOM instead of +// falling back to the other Decoders. +func FallbackDecoder(decoders ...Decoder) Decoder { + return func(p []byte) (c rune, size int, status Status) { + for _, d := range decoders { + c, size, status = d(p) + if status != INVALID_CHAR { + return + } + } + return 0, 1, INVALID_CHAR + } +} |