case b == ' ':
			buf.WriteByte('_')
		case b >= '!' && b <= '~' && b != '=' && b != '?' && b != '_':
			buf.WriteByte(b)
		default:
			buf.WriteByte('=')
			buf.WriteByte(upperhex[b>>4])
			buf.WriteByte(upperhex[b&0x0f])
		}
	}
}

// openWord writes the beginning of an encoded-word into buf.
func (e WordEncoder) openWord(buf *strings.Builder, charset string) {
	buf.WriteString("=?")

	j := 0
	for i := 0; i < len(s); i++ {
		switch c := s[i]; {
		case c == ' ' && mode == encodeQueryComponent:
			t[j] = '+'
			j++
		case shouldEscape(c, mode):
			t[j] = '%'
			t[j+1] = upperhex[c>>4]
			t[j+2] = upperhex[c&15]
			j += 3
		default:
			t[j] = s[i]
			j++
		}
	}
	return string(t)
}

// A URL represents a parsed URL (technically, a URI reference).
//

			mant++
		}
		mant <<= 60 - shift
		if mant&(1<<61) != 0 {
			// Wrapped around.
			mant >>= 1
			exp++
		}
	}

	hex := lowerhex
	if fmt == 'X' {
		hex = upperhex
	}

	// sign, 0x, leading digit
	if neg {
		dst = append(dst, '-')
	}
	dst = append(dst, '0', fmt, '0'+byte((mant>>60)&1))

	// .fraction
	mant <<= 4 // remove leading 0 or 1

// license that can be found in the LICENSE file.

//go:generate go run makeisprint.go -output isprint.go

package strconv

import (
	"unicode/utf8"
)

const (
	lowerhex = "0123456789abcdef"
	upperhex = "0123456789ABCDEF"
)

// contains reports whether the string contains the byte c.
func contains(s string, c byte) bool {
	return index(s, c) != -1
}