lf cr
parent
00cd6c6917
commit
0c561bbb23
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@ -0,0 +1,50 @@
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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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@ -0,0 +1,215 @@
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package eol_test
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import (
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"testing"
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"io"
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"strings"
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"sourcecode.social/reiver/go-utf8"
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"sourcecode.social/reiver/go-eol"
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)
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func TestReadLFCR(t *testing.T) {
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tests := []struct{
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Value string
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ExpectedSize int
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}{
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{
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Value: "\n\r",
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ExpectedSize: 2,
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},
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{
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Value: "\n\rapple banana cherry",
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ExpectedSize: 2,
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},
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}
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for testNumber, test := range tests {
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var reader io.Reader = strings.NewReader(test.Value)
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var runescanner io.RuneScanner = utf8.NewRuneScanner(reader)
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actualSize, err := eol.ReadLFCR(runescanner)
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if nil != err {
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t.Errorf("For test #%d, did not expect an error but actually got one.", testNumber)
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t.Logf("ERROR: (%T) %s", err, err)
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t.Logf("VALUE: %q", test.Value)
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continue
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}
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{
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expected := test.ExpectedSize
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actual := actualSize
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if expected != actual {
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t.Errorf("For test #%d, the actual size is not what was expected.", testNumber)
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t.Logf("EXPECTED: %d", expected)
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t.Logf("ACTUAL: %d", actual)
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t.Logf("VALUE: %q", test.Value)
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continue
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}
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}
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}
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}
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func TestReadLFCR_fail(t *testing.T) {
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tests := []struct{
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Value string
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ExpectedError string
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ExpectedSize int
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}{
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{
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Value: "",
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ExpectedError: `eol: problem reading character №1 of end-of-line sequence "\n\r": EOF`,
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},
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{
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Value: "\r",
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ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n\r" character №1 — instead found '\r' (U+000D)`,
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},
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{
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Value: "\n",
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ExpectedError: `eol: problem reading character №2 of end-of-line sequence "\n\r": EOF`,
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ExpectedSize: 1,
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},
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{
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Value: "\u0085",
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ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n\r" character №1 — instead found '\u0085' (U+0085)`,
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},
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{
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Value: "\u2028",
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ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n\r" character №1 — instead found '\u2028' (U+2028)`,
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},
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{
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Value: "😈",
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ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n\r" character №1 — instead found '😈' (U+1F608)`,
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},
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{
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Value: "\rapple banana cherry",
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ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n\r" character №1 — instead found '\r' (U+000D)`,
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},
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{
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Value: "\u0085apple banana cherry",
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ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n\r" character №1 — instead found '\u0085' (U+0085)`,
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},
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{
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Value: "\u2028apple banana cherry",
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ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n\r" character №1 — instead found '\u2028' (U+2028)`,
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},
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{
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Value: "😈apple banana cherry",
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ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n\r" character №1 — instead found '😈' (U+1F608)`,
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},
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{
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Value: " \r",
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ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n\r" character №1 — instead found ' ' (U+0020)`,
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},
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{
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Value: " \n",
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ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n\r" character №1 — instead found ' ' (U+0020)`,
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},
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{
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Value: " \u0085",
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ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n\r" character №1 — instead found ' ' (U+0020)`,
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},
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{
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Value: " \u2028",
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ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n\r" character №1 — instead found ' ' (U+0020)`,
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},
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{
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Value: " 😈",
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ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n\r" character №1 — instead found ' ' (U+0020)`,
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},
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{
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Value: ".\n",
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ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n\r" character №1 — instead found '.' (U+002E)`,
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},
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{
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Value: ".\r",
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ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n\r" character №1 — instead found '.' (U+002E)`,
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},
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{
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Value: ".\u0085",
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ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n\r" character №1 — instead found '.' (U+002E)`,
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},
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{
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Value: ".\u2028",
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ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n\r" character №1 — instead found '.' (U+002E)`,
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},
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{
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Value: ".😈",
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ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n\r" character №1 — instead found '.' (U+002E)`,
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},
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}
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for testNumber, test := range tests {
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var reader io.Reader = strings.NewReader(test.Value)
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var runescanner io.RuneScanner = utf8.NewRuneScanner(reader)
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actualSize, err := eol.ReadLFCR(runescanner)
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if nil == err {
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t.Errorf("For test #%d, expected an error but did not actually get one.", testNumber)
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t.Logf("EXPECTED-ERROR: %q", test.ExpectedError)
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t.Logf("VALUE: %q", test.Value)
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continue
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}
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{
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expected := test.ExpectedError
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actual := err.Error()
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if expected != actual {
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t.Errorf("For test #%d, the actual error is not what was expected.", testNumber)
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t.Logf("EXPECTED: %q", expected)
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t.Logf("ACTUAL: %q", actual)
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t.Logf("VALUE: %q", test.Value)
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continue
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}
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}
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{
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expected := test.ExpectedSize
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actual := actualSize
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if expected != actual {
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t.Errorf("For test #%d, the actual size is not what was expected.", testNumber)
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t.Logf("EXPECTED: %d", expected)
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t.Logf("ACTUAL: %d", actual)
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t.Logf("VALUE: %q", test.Value)
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continue
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}
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}
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}
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}
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