83 lines
1.8 KiB
Go
83 lines
1.8 KiB
Go
package pretty
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import (
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"io"
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"unicode/utf8"
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)
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var hexStr = "0123456789abcdef"
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func (d *Encoder) emitString(s string) {
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d.wr.Write(decoValSigil)
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d.writeByte('"')
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d.wr.Write(decoValString)
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start := 0
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for i := 0; i < len(s); {
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if b := s[i]; b < utf8.RuneSelf {
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if 0x20 <= b && b != '\\' && b != '"' {
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i++
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continue
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}
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if start < i {
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d.wr.Write([]byte(s[start:i]))
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}
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switch b {
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case '\\', '"':
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d.writeByte('\\')
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d.writeByte(b)
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case '\n':
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d.writeByte('\\')
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d.writeByte('n')
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case '\r':
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d.writeByte('\\')
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d.writeByte('r')
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case '\t':
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d.writeByte('\\')
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d.writeByte('t')
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default:
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// This encodes bytes < 0x20 except for \t, \n and \r.
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d.wr.Write([]byte(`\u00`))
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d.writeByte(hexStr[b>>4])
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d.writeByte(hexStr[b&0xF])
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}
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i++
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start = i
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continue
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}
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c, size := utf8.DecodeRuneInString(s[i:])
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if c == utf8.RuneError && size == 1 {
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if start < i {
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d.wr.Write([]byte(s[start:i]))
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}
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d.wr.Write([]byte(`\ufffd`))
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i += size
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start = i
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continue
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}
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// U+2028 is LINE SEPARATOR.
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// U+2029 is PARAGRAPH SEPARATOR.
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// They are both technically valid characters in JSON strings,
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// but don't work in JSONP, which has to be evaluated as JavaScript,
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// and can lead to security holes there. It is valid JSON to
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// escape them, so we do so unconditionally.
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// See http://timelessrepo.com/json-isnt-a-javascript-subset for discussion.
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if c == '\u2028' || c == '\u2029' {
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if start < i {
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d.wr.Write([]byte(s[start:i]))
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}
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d.wr.Write([]byte(`\u202`))
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d.writeByte(hexStr[c&0xF])
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i += size
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start = i
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continue
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}
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i += size
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}
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if start < len(s) {
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io.WriteString(d.wr, s[start:])
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}
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d.wr.Write(decoValSigil)
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d.writeByte('"')
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d.wr.Write(decoOff)
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}
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