57 lines
1.4 KiB
Go
57 lines
1.4 KiB
Go
package format
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import (
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"strings"
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"unsafe"
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)
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// ContainsSpaceOrTab checks if "s" contains space or tabs.
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func ContainsSpaceOrTab(s string) bool {
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if i := strings.IndexByte(s, ' '); i != -1 {
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return true // note using indexbyte as it is ASM.
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} else if i := strings.IndexByte(s, '\t'); i != -1 {
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return true
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}
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return false
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}
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// ContainsDoubleQuote checks if "s" contains a double quote.
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func ContainsDoubleQuote(s string) bool {
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return (strings.IndexByte(s, '"') != -1)
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}
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// AppendEscape will append 's' to 'dst' and escape any double quotes.
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func AppendEscape(dst []byte, str string) []byte {
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var delim bool
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for i := range str {
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if str[i] == '\\' && !delim {
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// Set delim flag
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delim = true
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continue
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} else if str[i] == '"' && !delim {
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// Append escaped double quote
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dst = append(dst, `\"`...)
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continue
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} else if delim {
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// Append skipped slash
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dst = append(dst, `\`...)
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delim = false
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}
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// Append char as-is
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dst = append(dst, str[i])
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}
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return dst
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}
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// isNil will safely check if 'v' is nil without dealing with weird Go interface nil bullshit.
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func isNil(i interface{}) bool {
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type eface struct{ _type, data unsafe.Pointer } //nolint
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return (*(*eface)(unsafe.Pointer(&i))).data == nil //nolint
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}
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// b2s converts a byteslice to string without allocation.
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func b2s(b []byte) string {
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return *(*string)(unsafe.Pointer(&b))
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}
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