vertical-tab

README.md

@@ -5,6 +5,7 @@ Package **eol** implements tools for working with end-of-line, for the Go progra
 The end-of-line sequences it supports is:
 
 * `"\n"     // line-feed       (LF)`
+* `"\v"     // vertical-tab    (VT)`
 * `"\n\r"   // line-feed       (LF), carriage-return (CR)`
 * `"\r"     // carriage-return (CR)`
 * `"\r\n"   // carriage-return (CR), line-feed (LF)`

circumstance.go

@@ -28,6 +28,8 @@ import (
 //
 //	var circumstance internalCircumstance = specifyCircumstance(opt.Something]("\n"), 1)
 //
+//	var circumstance internalCircumstance = specifyCircumstance(opt.Something]("\v"), 1)
+//
 //	var circumstance internalCircumstance = specifyCircumstance(opt.Something]("\r"), 1)
 //
 //	var circumstance internalCircumstance = specifyCircumstance(opt.Something]("\r\n"), 1)

notfound.go

@@ -9,6 +9,7 @@ import (
 	"sourcecode.social/reiver/go-eol/lf"
 	"sourcecode.social/reiver/go-eol/ls"
 	"sourcecode.social/reiver/go-eol/nel"
+	"sourcecode.social/reiver/go-eol/vt"
 )
 
 var _ error = internalNotFoundError{}
@@ -46,6 +47,12 @@ func (receiver internalNotFoundError) Error() string {
 			s    = fmt.Sprintf(`eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence %q character №%d — instead found %q (%U)`, sequence, characterNumber, actual, actual)
 		})
 		p = append(p, s...)
+	case vt.Rune:
+		var s string = fmt.Sprintf(`eol: vertical-tab (VT) character ('\v') (U+000B) not found for end-of-line sequence character №%d — instead found %q (%U)`, characterNumber, actual, actual)
+		eolSequence.WhenSomething(func(sequence string){
+			s    = fmt.Sprintf(`eol: vertical-tab (VT) character ('\v') (U+000B) not found for end-of-line sequence %q character №%d — instead found %q (%U)`, sequence, characterNumber, actual, actual)
+		})
+		p = append(p, s...)
 	case cr.Rune:
 			var s string = fmt.Sprintf(`eol: carriage-return (CR) character ('\r') (U+000D) not found for end-of-line sequence character №%d — instead found %q (%U)`, characterNumber, actual, actual)
 		eolSequence.WhenSomething(func(sequence string){

readeol.go

@@ -11,6 +11,7 @@ import (
 	"sourcecode.social/reiver/go-eol/lfcr"
 	"sourcecode.social/reiver/go-eol/ls"
 	"sourcecode.social/reiver/go-eol/nel"
+	"sourcecode.social/reiver/go-eol/vt"
 )
 
 // ReadEOL tries to read an end-of-line sequence.
@@ -18,6 +19,7 @@ import (
 // The end-of-line sequences it supports are:
 //
 //	line-feed       (LF)  (U+000A) ('\n')
+//	vertical-tab    (VT)  (U+000B) ('\v')
 //	line-feed, carriage-return     ("\n\r")
 //	carriage-return (CR)  (U+000D) ('\r')
 //	carriage-return, line-feed     ("\r\n")
@@ -52,6 +54,8 @@ func ReadEOL(runescanner io.RuneScanner) (endofline string, size int, err error)
 	switch r0 {
 	case lf.Rune:
 		// Nothing here.
+	case vt.Rune:
+		return vt.String, size0, nil
 	case cr.Rune:
 		// Nothing here.
 	case nel.Rune:

readeol_test.go

@@ -15,6 +15,7 @@ import (
 	"sourcecode.social/reiver/go-eol/lfcr"
 	"sourcecode.social/reiver/go-eol/ls"
 	"sourcecode.social/reiver/go-eol/nel"
+	"sourcecode.social/reiver/go-eol/vt"
 )
 
 func TestReadEOL(t *testing.T) {
@@ -29,6 +30,11 @@ func TestReadEOL(t *testing.T) {
 			ExpectedEOL: lf.String,
 			ExpectedSize: 1,
 		},
+		{
+			Value: "\v",
+			ExpectedEOL: vt.String,
+			ExpectedSize: 1,
+		},
 		{
 			Value: "\n\r",
 			ExpectedEOL: lfcr.String,
@@ -62,6 +68,11 @@ func TestReadEOL(t *testing.T) {
 			ExpectedEOL: lf.String,
 			ExpectedSize: 1,
 		},
+		{
+			Value: "\vapple banana cherry",
+			ExpectedEOL: vt.String,
+			ExpectedSize: 1,
+		},
 		{
 			Value: "\n\rapple banana cherr",
 			ExpectedEOL: lfcr.String,

readvt.go

@@ -0,0 +1,24 @@
+package eol
+
+import (
+	"io"
+
+	"sourcecode.social/reiver/go-opt"
+
+	"sourcecode.social/reiver/go-eol/vt"
+)
+
+// ReadVT tries to read the "\r" (i.e., carriage-return) end-of-line sequence.
+//
+// If successful, it returns the number-of-bytes read (to read in end-of-line sequence "\r").
+//
+// If the character read is not a '\r', then ReadVT will try to unread the character.
+//
+// Example usage:
+//
+//	size, err := eol.ReadVT(runescanner)
+func ReadVT(runescanner io.RuneScanner) (size int, err error) {
+	const characterNumber uint64 = 1
+	var circumstance internalCircumstance = specifyCircumstance(opt.Something(vt.String), characterNumber)
+	return readthisrune(circumstance, runescanner, vt.Rune)
+}

readvt_test.go

@@ -0,0 +1,209 @@
+package eol_test
+
+import (
+	"testing"
+
+	"io"
+	"strings"
+
+	"sourcecode.social/reiver/go-utf8"
+
+	"sourcecode.social/reiver/go-eol"
+)
+
+func TestReadVT(t *testing.T) {
+
+	tests := []struct{
+		Value string
+		ExpectedSize int
+	}{
+		{
+			Value: "\v",
+			ExpectedSize: 1,
+		},
+
+
+
+		{
+			Value: "\vapple banana cherry",
+			ExpectedSize: 1,
+		},
+	}
+
+	for testNumber, test := range tests {
+
+		var reader io.Reader = strings.NewReader(test.Value)
+		var runescanner io.RuneScanner = utf8.NewRuneScanner(reader)
+
+		actualSize, err := eol.ReadVT(runescanner)
+		if nil != err {
+			t.Errorf("For test #%d, did not expect an error but actually got one.", testNumber)
+			t.Logf("ERROR: (%T) %s", err, err)
+			t.Logf("VALUE: %q", test.Value)
+			continue
+		}
+
+		{
+			expected := test.ExpectedSize
+			actual   := actualSize
+
+			if expected != actual {
+				t.Errorf("For test #%d, the actual size is not what was expected.", testNumber)
+				t.Logf("EXPECTED: %d", expected)
+				t.Logf("ACTUAL:   %d", actual)
+				t.Logf("VALUE: %q", test.Value)
+				continue
+			}
+		}
+
+	}
+}
+
+func TestReadVT_fail(t *testing.T) {
+
+	tests := []struct{
+		Value string
+		ExpectedError string
+	}{
+		{
+			Value: "",
+			ExpectedError: `eol: problem reading character №1 of end-of-line sequence "\v": EOF`,
+		},
+
+
+
+		{
+			Value: "\n",
+			ExpectedError: `eol: vertical-tab (VT) character ('\v') (U+000B) not found for end-of-line sequence "\v" character №1 — instead found '\n' (U+000A)`,
+		},
+		{
+			Value: "\u0085",
+			ExpectedError: `eol: vertical-tab (VT) character ('\v') (U+000B) not found for end-of-line sequence "\v" character №1 — instead found '\u0085' (U+0085)`,
+		},
+		{
+			Value: "\u2028",
+			ExpectedError: `eol: vertical-tab (VT) character ('\v') (U+000B) not found for end-of-line sequence "\v" character №1 — instead found '\u2028' (U+2028)`,
+		},
+
+
+
+		{
+			Value: "😈",
+			ExpectedError: `eol: vertical-tab (VT) character ('\v') (U+000B) not found for end-of-line sequence "\v" character №1 — instead found '😈' (U+1F608)`,
+		},
+
+
+
+		{
+			Value: "\napple banana cherry",
+			ExpectedError: `eol: vertical-tab (VT) character ('\v') (U+000B) not found for end-of-line sequence "\v" character №1 — instead found '\n' (U+000A)`,
+		},
+		{
+			Value: "\u0085apple banana cherry",
+			ExpectedError: `eol: vertical-tab (VT) character ('\v') (U+000B) not found for end-of-line sequence "\v" character №1 — instead found '\u0085' (U+0085)`,
+		},
+		{
+			Value: "\u2028apple banana cherry",
+			ExpectedError: `eol: vertical-tab (VT) character ('\v') (U+000B) not found for end-of-line sequence "\v" character №1 — instead found '\u2028' (U+2028)`,
+		},
+
+
+
+		{
+			Value: "😈apple banana cherry",
+			ExpectedError: `eol: vertical-tab (VT) character ('\v') (U+000B) not found for end-of-line sequence "\v" character №1 — instead found '😈' (U+1F608)`,
+		},
+
+
+
+		{
+			Value: " \n",
+			ExpectedError: `eol: vertical-tab (VT) character ('\v') (U+000B) not found for end-of-line sequence "\v" character №1 — instead found ' ' (U+0020)`,
+		},
+		{
+			Value: " \r",
+			ExpectedError: `eol: vertical-tab (VT) character ('\v') (U+000B) not found for end-of-line sequence "\v" character №1 — instead found ' ' (U+0020)`,
+		},
+		{
+			Value: " \u0085",
+			ExpectedError: `eol: vertical-tab (VT) character ('\v') (U+000B) not found for end-of-line sequence "\v" character №1 — instead found ' ' (U+0020)`,
+		},
+		{
+			Value: " \u2028",
+			ExpectedError: `eol: vertical-tab (VT) character ('\v') (U+000B) not found for end-of-line sequence "\v" character №1 — instead found ' ' (U+0020)`,
+		},
+
+
+
+		{
+			Value: " 😈",
+			ExpectedError: `eol: vertical-tab (VT) character ('\v') (U+000B) not found for end-of-line sequence "\v" character №1 — instead found ' ' (U+0020)`,
+		},
+
+
+
+		{
+			Value: ".\n",
+			ExpectedError: `eol: vertical-tab (VT) character ('\v') (U+000B) not found for end-of-line sequence "\v" character №1 — instead found '.' (U+002E)`,
+		},
+		{
+			Value: ".\r",
+			ExpectedError: `eol: vertical-tab (VT) character ('\v') (U+000B) not found for end-of-line sequence "\v" character №1 — instead found '.' (U+002E)`,
+		},
+		{
+			Value: ".\u0085",
+			ExpectedError: `eol: vertical-tab (VT) character ('\v') (U+000B) not found for end-of-line sequence "\v" character №1 — instead found '.' (U+002E)`,
+		},
+		{
+			Value: ".\u2028",
+			ExpectedError: `eol: vertical-tab (VT) character ('\v') (U+000B) not found for end-of-line sequence "\v" character №1 — instead found '.' (U+002E)`,
+		},
+
+
+
+		{
+			Value: ".😈",
+			ExpectedError: `eol: vertical-tab (VT) character ('\v') (U+000B) not found for end-of-line sequence "\v" character №1 — instead found '.' (U+002E)`,
+		},
+	}
+
+	for testNumber, test := range tests {
+
+		var reader io.Reader = strings.NewReader(test.Value)
+		var runescanner io.RuneScanner = utf8.NewRuneScanner(reader)
+
+		actualSize, err := eol.ReadVT(runescanner)
+		if nil == err {
+			t.Errorf("For test #%d, expected an error but did not actually get one.", testNumber)
+			t.Logf("EXPECTED-ERROR: %q", test.ExpectedError)
+			t.Logf("VALUE: %q", test.Value)
+			continue
+		}
+
+		{
+			expected := test.ExpectedError
+			actual   := err.Error()
+
+			if expected != actual {
+				t.Errorf("For test #%d, the actual error is not what was expected.", testNumber)
+				t.Logf("EXPECTED: %q", expected)
+				t.Logf("ACTUAL:   %q", actual)
+				t.Logf("VALUE: %q", test.Value)
+				continue
+			}
+		}
+
+		{
+			expected := 0
+			actual   := actualSize
+
+			if expected != actual {
+				t.Errorf("For test #%d, the actual size is not what was expected.", testNumber)
+				t.Logf("EXPECTED: %d", expected)
+				t.Logf("ACTUAL:   %d", actual)
+				t.Logf("VALUE: %q", test.Value)
+				continue
+			}
+		}
+	}
+}

vt/byte.go

@@ -0,0 +1,3 @@
+package vt
+
+const Byte byte  = '\u000B'

vt/rune.go

@@ -0,0 +1,3 @@
+package vt
+
+const Rune rune  = '\u000B'

vt/string.go

@@ -0,0 +1,3 @@
+package vt
+
+const String string  = string(Rune)