51 lines
1.4 KiB
Go
51 lines
1.4 KiB
Go
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package eol
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import (
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"io"
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"sourcecode.social/reiver/go-opt"
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"sourcecode.social/reiver/go-eol/cr"
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"sourcecode.social/reiver/go-eol/lf"
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"sourcecode.social/reiver/go-eol/lfcr"
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)
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// ReadLFCR tries to read the "\r\n" (i.e., carriage-return line-feed) end-of-line sequence.
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//
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// If successful, it returns the number-of-bytes read (to read in end-of-line sequence "\r\n").
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//
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// If the first character read is not a '\n', then ReadLFCR will try to unread the character.
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// If the second character read is not a '\r', then ReadLFCR will also try to unread the second character, but will not be able to unread the first character (i.e., '\n') it already read.
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//
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// Example usage:
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//
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// size, err := eol.ReadLFCR(runescanner)
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func ReadLFCR(runescanner io.RuneScanner) (size int, err error) {
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var size0 int
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{
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var err error
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const characterNumber uint64 = 1
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var circumstance internalCircumstance = specifyCircumstance(opt.Something(lfcr.String), characterNumber)
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size0, err = readthisrune(circumstance, runescanner, lf.Rune)
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if nil != err {
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return size0, err
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}
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}
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var size1 int
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{
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var err error
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const characterNumber uint64 = 2
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var circumstance internalCircumstance = specifyCircumstance(opt.Something(lfcr.String), characterNumber)
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size1, err = readthisrune(circumstance, runescanner, cr.Rune)
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if nil != err {
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return size1+size0, err
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}
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}
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return size1+size0, nil
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}
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