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add --image-url-substitution #296
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,59 @@ | ||
| package checker | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "regexp" | ||
| "strings" | ||
| ) | ||
|
|
||
| type Substitution struct { | ||
| Pattern *regexp.Regexp | ||
| Substitute string | ||
| All bool | ||
| } | ||
|
|
||
| func NewSubstitutionFromSedCommand(sedCommand string) (*Substitution, error) { | ||
| pattern, substitute, flags, err := splitSedSubstitutionCommand(sedCommand) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| compiledPattern, err := regexp.Compile(pattern) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("sed command for substitution has regex that does not compile: %s %w", pattern, err) | ||
| } | ||
| var all bool | ||
| if flags == "g" { | ||
| all = true | ||
| } else if flags != "" { | ||
| return nil, fmt.Errorf("sed command for substitution only supports the 'g' flag: %s", flags) | ||
| } | ||
|
|
||
| return &Substitution{ | ||
| Pattern: compiledPattern, | ||
| Substitute: substitute, | ||
| All: all, | ||
| }, nil | ||
| } | ||
|
|
||
| func splitSedSubstitutionCommand(sedCommand string) (string, string, string, error) { | ||
| if len(sedCommand) < 4 { | ||
| return "", "", "", fmt.Errorf("sed command for substitution seems to short: %s", sedCommand) | ||
| } | ||
| if sedCommand[0] != 's' { | ||
| return "", "", "", fmt.Errorf("sed command for substitution should start with s: %s", sedCommand) | ||
| } | ||
| separator := regexp.QuoteMeta(sedCommand[1:2]) | ||
| group := fmt.Sprintf(`((?:.|\\[%s])*)`, separator) | ||
| pattern := `^s` + separator + group + separator + group + separator + group + `$` | ||
| matcher, err := regexp.Compile(pattern) | ||
| if err != nil { | ||
| return "", "", "", fmt.Errorf("regexp to parse sed command for substitution does not compile: %s %w", pattern, err) | ||
| } | ||
| submatches := matcher.FindStringSubmatch(sedCommand) | ||
| if len(submatches) != 4 { | ||
| return "", "", "", fmt.Errorf("sed command for substitution could not be parsed: %s", pattern) | ||
| } | ||
| return strings.ReplaceAll(submatches[1], "\\"+separator, separator), | ||
| strings.ReplaceAll(submatches[2], "\\"+separator, separator), | ||
| submatches[3], nil | ||
| } | ||
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Is there any reason why you chose SED over a standard/traditional Regex? (which looks like you're doing anyway after all the sed-specific searches)
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I used the sed-like format/syntax to have the search and replacement string in one cli option. It seemed like a well-known/popular/widely-used format to me (
s/search/replace). For the rest it doesn't have anything to do with sed.