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README.md

@@ -1,4 +1,7 @@
 # ASV
+
+[![Go Reference](https://pkg.go.dev/badge/git.tebibyte.media/sashakoshka/go-asv.svg)](https://pkg.go.dev/git.tebibyte.media/sashakoshka/go-asv)
+
 This module allows encoding and decoding data using ASV (ASCII-separated
 values). Data is organized into a hierarchy of files, groups, records, and
 units, separated by ASCII FS, GS, RS, and US respectively.

asv.go

@@ -4,6 +4,7 @@ package asv
 import "io"
 import "bufio"
 import "strings"
+import "strconv"
 
 // Collection is composed of Files.
 type Collection []File
@@ -16,6 +17,50 @@ type Record []Unit
 // Unit is an element of a record.
 type Unit string
 
+func (collection Collection) String () string {
+	builder := strings.Builder { }
+	builder.WriteString("Collection { ")
+	for index, file := range collection {
+		if index > 0 { builder.WriteString(", ") }
+		builder.WriteString(file.String())
+	}
+	builder.WriteString(" }")
+	return builder.String()
+}
+
+func (file File) String () string {
+	builder := strings.Builder { }
+	builder.WriteString("File { ")
+	for index, group := range file {
+		if index > 0 { builder.WriteString(", ") }
+		builder.WriteString(group.String())
+	}
+	builder.WriteString(" }")
+	return builder.String()
+}
+
+func (group Group) String () string {
+	builder := strings.Builder { }
+	builder.WriteString("Group { ")
+	for index, record := range group {
+		if index > 0 { builder.WriteString(", ") }
+		builder.WriteString(record.String())
+	}
+	builder.WriteString(" }")
+	return builder.String()
+}
+
+func (record Record) String () string {
+	builder := strings.Builder { }
+	builder.WriteString("Record { ")
+	for index, unit := range record {
+		if index > 0 { builder.WriteString(", ") }
+		builder.WriteString(strconv.Quote(string(unit)))
+	}
+	builder.WriteString(" }")
+	return builder.String()
+}
+
 const (
 	Escape          rune = '\x1B'
 	FileSeparator   rune = '\x1C'
@@ -61,7 +106,7 @@ func (this *Decoder) ReadFile () (file File, next rune, err error) {
 		group, next, err := this.ReadGroup()
 		file = append(file, group)
 		if err != nil { return file, 0, err }
-		if next >= FileSeparator {
+		if next <= FileSeparator {
 			return file, next, nil
 		}
 	}
@@ -76,7 +121,7 @@ func (this *Decoder) ReadGroup () (group Group, next rune, err error) {
 		record, next, err := this.ReadRecord()
 		group = append(group, record)
 		if err != nil { return group, 0, err }
-		if next >= GroupSeparator {
+		if next <= GroupSeparator {
 			return group, next, nil
 		}
 	}
@@ -91,7 +136,7 @@ func (this *Decoder) ReadRecord () (record Record, next rune, err error) {
 		unit, next, err := this.ReadUnit()
 		record = append(record, unit)
 		if err != nil { return record, 0, err }
-		if next >= RecordSeparator {
+		if next <= RecordSeparator {
 			return record, next, nil
 		}
 	}
@@ -111,12 +156,17 @@ func (this *Decoder) ReadUnit () (unit Unit, next rune, err error) {
 		char, _, err := this.reader.ReadRune()
 		if err != nil { return Unit(str.String()), 0, err }
 
-		if esc {
+		switch {
+		case esc:
 			esc = false
-		} else if char >= FileSeparator && char <= UnitSeparator {
+			str.WriteRune(char)
+		case char == Escape:
+			esc = true
+		case IsSeparator(char):
 			return Unit(str.String()), char, nil
+		default:
+			str.WriteRune(char)
 		}
-		str.WriteRune(char)
 	}
 }
 

asv_test.go

@@ -0,0 +1,70 @@
+package asv
+
+import "io"
+import "strings"
+import "testing"
+import "reflect"
+
+func TestDecodeCollection (test *testing.T) {
+	decoder := NewDecoder(strings.NewReader(
+"record\x1fone\x1erecord\x1ftwo\x1drecord one in group two\x1crecord one in file two" +
+"\x1flots of \x1b\x1b\x1b\x1f\x1b\x1d\x1b\x1e\x1b\x1cescape sequences"))
+	got, err := decoder.ReadCollection()
+	testErr(test, err)
+	testEqual(test, "structures", got,
+		Collection {
+			File {
+				Group {
+					Record {
+						"record",
+						"one",
+					},
+					Record {
+						"record",
+						"two",
+					},
+				},
+				Group {
+					Record {
+						"record one in group two",
+					},
+				},
+			},
+			File {
+				Group {
+					Record {
+						"record one in file two",
+						"lots of \x1b\x1f\x1d\x1e\x1cescape sequences",
+					},
+				},	
+			},
+		})
+}
+
+func TestDecodeRecord (test *testing.T) {
+	decoder := NewDecoder(strings.NewReader(
+"record\x1fone"))
+	got, next, err := decoder.ReadRecord()
+	testEqual(test, "errors", err,  io.EOF)
+	testEqual(test, "next",   next, rune(0))
+	testEqual(test, "structures", got,
+		Record {
+			"record",
+			"one",
+		})
+}
+
+func testErr (test *testing.T, err error) {
+	if err != nil {
+		test.Fatalf("unexpected error: %v", err)
+	}
+}
+
+func testEqual (test *testing.T, desc string, got, correct any) {
+	if !reflect.DeepEqual(got, correct) {
+		test.Error(desc, "not equal")
+		test.Errorf("GOT:\n%v",     got)
+		test.Errorf("CORRECT:\n%v", correct)
+		test.FailNow()
+	}
+}