109 lines
2 KiB
Go
109 lines
2 KiB
Go
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// Package glob provides objects for matching strings with globs
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package glob
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import "regexp"
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// Glob is a wrapper of *regexp.Regexp.
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// It should contain a glob expression compiled into a regular expression.
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type Glob struct {
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*regexp.Regexp
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}
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// Compile a takes a glob expression as a string and transforms it
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// into a *Glob object (which is really just a regular expression)
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// Compile also returns a possible error.
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func Compile(pattern string) (*Glob, error) {
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r, err := globToRegex(pattern)
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return &Glob{r}, err
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}
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func globToRegex(glob string) (*regexp.Regexp, error) {
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regex := ""
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inGroup := 0
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inClass := 0
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firstIndexInClass := -1
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arr := []byte(glob)
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hasGlobCharacters := false
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for i := 0; i < len(arr); i++ {
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ch := arr[i]
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switch ch {
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case '\\':
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i++
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if i >= len(arr) {
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regex += "\\"
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} else {
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next := arr[i]
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switch next {
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case ',':
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// Nothing
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case 'Q', 'E':
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regex += "\\\\"
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default:
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regex += "\\"
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}
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regex += string(next)
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}
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case '*':
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if inClass == 0 {
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regex += ".*"
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} else {
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regex += "*"
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}
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hasGlobCharacters = true
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case '?':
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if inClass == 0 {
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regex += "."
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} else {
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regex += "?"
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}
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hasGlobCharacters = true
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case '[':
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inClass++
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firstIndexInClass = i + 1
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regex += "["
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hasGlobCharacters = true
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case ']':
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inClass--
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regex += "]"
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case '.', '(', ')', '+', '|', '^', '$', '@', '%':
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if inClass == 0 || (firstIndexInClass == i && ch == '^') {
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regex += "\\"
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}
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regex += string(ch)
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hasGlobCharacters = true
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case '!':
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if firstIndexInClass == i {
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regex += "^"
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} else {
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regex += "!"
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}
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hasGlobCharacters = true
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case '{':
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inGroup++
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regex += "("
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hasGlobCharacters = true
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case '}':
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inGroup--
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regex += ")"
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case ',':
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if inGroup > 0 {
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regex += "|"
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hasGlobCharacters = true
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} else {
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regex += ","
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}
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default:
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regex += string(ch)
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}
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}
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if hasGlobCharacters {
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return regexp.Compile("^" + regex + "$")
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} else {
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return regexp.Compile(regex)
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}
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}
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