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30 lines
546 B
Go
30 lines
546 B
Go
package parser
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import (
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"bytes"
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"strconv"
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)
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// IsCallout detects a callout in the following format: <<N>> Where N is a integer > 0.
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func IsCallout(data []byte) (id []byte, consumed int) {
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if !bytes.HasPrefix(data, []byte("<<")) {
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return nil, 0
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}
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start := 2
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end := bytes.Index(data[start:], []byte(">>"))
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if end < 0 {
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return nil, 0
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}
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b := data[start : start+end]
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b = bytes.TrimSpace(b)
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i, err := strconv.Atoi(string(b))
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if err != nil {
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return nil, 0
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}
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if i <= 0 {
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return nil, 0
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}
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return b, start + end + 2 // 2 for >>
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}
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