86 lines
2.0 KiB
Go
86 lines
2.0 KiB
Go
package misspell
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import (
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"bytes"
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"regexp"
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"strings"
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)
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var (
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reEmail = regexp.MustCompile(`[a-zA-Z0-9_.%+-]+@[a-zA-Z0-9-.]+\.[a-zA-Z]{2,6}[^a-zA-Z]`)
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reHost = regexp.MustCompile(`[a-zA-Z0-9-.]+\.[a-zA-Z]+`)
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reBackslash = regexp.MustCompile(`\\[a-z]`)
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)
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// RemovePath attempts to strip away embedded file system paths, e.g.
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// /foo/bar or /static/myimg.png
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//
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// TODO: windows style
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//
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func RemovePath(s string) string {
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out := bytes.Buffer{}
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var idx int
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for len(s) > 0 {
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if idx = strings.IndexByte(s, '/'); idx == -1 {
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out.WriteString(s)
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break
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}
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if idx > 0 {
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idx--
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}
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var chclass string
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switch s[idx] {
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case '/', ' ', '\n', '\t', '\r':
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chclass = " \n\r\t"
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case '[':
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chclass = "]\n"
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case '(':
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chclass = ")\n"
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default:
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out.WriteString(s[:idx+2])
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s = s[idx+2:]
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continue
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}
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endx := strings.IndexAny(s[idx+1:], chclass)
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if endx != -1 {
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out.WriteString(s[:idx+1])
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out.Write(bytes.Repeat([]byte{' '}, endx))
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s = s[idx+endx+1:]
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} else {
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out.WriteString(s)
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break
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}
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}
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return out.String()
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}
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// replaceWithBlanks returns a string with the same number of spaces as the input
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func replaceWithBlanks(s string) string {
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return strings.Repeat(" ", len(s))
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}
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// RemoveEmail remove email-like strings, e.g. "nickg+junk@xfoobar.com", "nickg@xyz.abc123.biz"
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func RemoveEmail(s string) string {
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return reEmail.ReplaceAllStringFunc(s, replaceWithBlanks)
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}
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// RemoveHost removes host-like strings "foobar.com" "abc123.fo1231.biz"
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func RemoveHost(s string) string {
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return reHost.ReplaceAllStringFunc(s, replaceWithBlanks)
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}
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// RemoveBackslashEscapes removes characters that are preceeded by a backslash
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// commonly found in printf format stringd "\nto"
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func removeBackslashEscapes(s string) string {
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return reBackslash.ReplaceAllStringFunc(s, replaceWithBlanks)
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}
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// RemoveNotWords blanks out all the not words
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func RemoveNotWords(s string) string {
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// do most selective/specific first
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return removeBackslashEscapes(RemoveHost(RemoveEmail(RemovePath(StripURL(s)))))
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}
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