94 lines
1.8 KiB
Go
94 lines
1.8 KiB
Go
package quicktemplate
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import (
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"io"
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"strings"
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)
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func writeJSONString(w io.Writer, s string) {
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if len(s) > 24 &&
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strings.IndexByte(s, '"') < 0 &&
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strings.IndexByte(s, '\\') < 0 &&
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strings.IndexByte(s, '\n') < 0 &&
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strings.IndexByte(s, '\r') < 0 &&
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strings.IndexByte(s, '\t') < 0 &&
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strings.IndexByte(s, '\f') < 0 &&
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strings.IndexByte(s, '\b') < 0 &&
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strings.IndexByte(s, '<') < 0 &&
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strings.IndexByte(s, '\'') < 0 &&
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strings.IndexByte(s, 0) < 0 {
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// fast path - nothing to escape
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w.Write(unsafeStrToBytes(s))
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return
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}
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// slow path
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write := w.Write
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b := unsafeStrToBytes(s)
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j := 0
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n := len(b)
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if n > 0 {
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// Hint the compiler to remove bounds checks in the loop below.
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_ = b[n-1]
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}
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for i := 0; i < n; i++ {
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switch b[i] {
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case '"':
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write(b[j:i])
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write(strBackslashQuote)
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j = i + 1
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case '\\':
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write(b[j:i])
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write(strBackslashBackslash)
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j = i + 1
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case '\n':
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write(b[j:i])
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write(strBackslashN)
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j = i + 1
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case '\r':
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write(b[j:i])
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write(strBackslashR)
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j = i + 1
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case '\t':
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write(b[j:i])
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write(strBackslashT)
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j = i + 1
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case '\f':
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write(b[j:i])
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write(strBackslashF)
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j = i + 1
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case '\b':
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write(b[j:i])
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write(strBackslashB)
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j = i + 1
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case '<':
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write(b[j:i])
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write(strBackslashLT)
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j = i + 1
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case '\'':
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write(b[j:i])
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write(strBackslashQ)
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j = i + 1
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case 0:
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write(b[j:i])
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write(strBackslashZero)
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j = i + 1
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}
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}
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write(b[j:])
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}
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var (
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strBackslashQuote = []byte(`\"`)
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strBackslashBackslash = []byte(`\\`)
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strBackslashN = []byte(`\n`)
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strBackslashR = []byte(`\r`)
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strBackslashT = []byte(`\t`)
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strBackslashF = []byte(`\u000c`)
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strBackslashB = []byte(`\u0008`)
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strBackslashLT = []byte(`\u003c`)
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strBackslashQ = []byte(`\u0027`)
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strBackslashZero = []byte(`\u0000`)
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)
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