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simplify quoteString

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Benchmark results comparison:

benchmark                              old ns/op     new ns/op     delta
BenchmarkValidIdentifier-4             250           241           -3.60%
BenchmarkValidIdentifierUnquoted-4     423           418           -1.18%
BenchmarkValidIdentifierReserved-4     22.0          26.9          +22.27%
BenchmarkBigJSON-4                     84351117      83896179      -0.54%
BenchmarkStatementsLess-4              91.9          90.7          -1.31%
BenchmarkFill-4                        10096         9877          -2.17%
BenchmarkValueTokenFromInterface-4     2274          1977          -13.06%
This commit is contained in:
Mateusz Czapliński 2018-12-06 23:58:42 +01:00
parent 6071b6f9ba
commit d34e9963b7
1 changed files with 24 additions and 40 deletions
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64
token.go
View file

@ -148,53 +148,37 @@ func quoteString(s string) string {
_ = out.WriteByte('"')
for _, r := range s {
if r == '\\' || r == '"' {
_ = out.WriteByte('\\')
_, _ = out.WriteRune(r)
continue
}
switch r {
case '\\':
_, _ = out.WriteString(`\\`)
case '"':
_, _ = out.WriteString(`\"`)
case '\b':
_, _ = out.WriteString(`\b`)
case '\f':
_, _ = out.WriteString(`\f`)
case '\n':
_, _ = out.WriteString(`\n`)
case '\r':
_, _ = out.WriteString(`\r`)
case '\t':
_, _ = out.WriteString(`\t`)
// \u2028 and \u2029 are separator runes that are not valid
// in javascript strings so they must be escaped.
// See http://timelessrepo.com/json-isnt-a-javascript-subset
if r == '\u2028' {
case '\u2028':
_, _ = out.WriteString(`\u2028`)
continue
}
if r == '\u2029' {
case '\u2029':
_, _ = out.WriteString(`\u2029`)
continue
}
// Any other control runes must be escaped
if unicode.IsControl(r) {
switch r {
case '\b':
_ = out.WriteByte('\\')
_ = out.WriteByte('b')
case '\f':
_ = out.WriteByte('\\')
_ = out.WriteByte('f')
case '\n':
_ = out.WriteByte('\\')
_ = out.WriteByte('n')
case '\r':
_ = out.WriteByte('\\')
_ = out.WriteByte('r')
case '\t':
_ = out.WriteByte('\\')
_ = out.WriteByte('t')
default:
_, _ = out.WriteString(fmt.Sprintf(`\u%04X`, r))
default:
// Any other control runes must be escaped
if unicode.IsControl(r) {
_, _ = fmt.Fprintf(out, `\u%04X`, r)
} else {
// Unescaped rune
_, _ = out.WriteRune(r)
}
continue
}
// Unescaped rune
_, _ = out.WriteRune(r)
}
_ = out.WriteByte('"')