feat: implemented csv

types/csv/csv.go

@@ -1,7 +1,20 @@
 package csv
 
+import (
+	"encoding/csv"
+	"strings"
+)
+
 // IsCSV returns true if the content is a CSV.
 func IsCSV(content string) error {
-	// TODO: implement this function
+	if content == "" {
+		return ErrEmptyContent
+	}
+	reader := csv.NewReader(strings.NewReader(content))
+	_, err := reader.ReadAll()
+	if err != nil {
+		return err
+	}
+
 	return nil
 }

types/csv/csv_test.go

@@ -0,0 +1,77 @@
+package csv
+
+import "testing"
+
+func TestIsCSV(t *testing.T) {
+	type args struct {
+		content string
+	}
+	tests := []struct {
+		name    string
+		args    args
+		wantErr bool
+	}{
+		{
+			name:    "empty",
+			args:    args{content: ""},
+			wantErr: true,
+		},
+		{
+			name:    "simple string is csv",
+			args:    args{content: "foo"},
+			wantErr: false,
+		},
+		{
+			name:    "csv comma separated",
+			args:    args{content: "foo,bar\nbaz,qux"},
+			wantErr: false,
+		},
+		{
+			name:    "csv semicolon separated",
+			args:    args{content: "foo;bar\nbaz;qux"},
+			wantErr: false,
+		},
+		{
+			name:    "csv tab separated",
+			args:    args{content: "foo\tbar\nbaz\tqux"},
+			wantErr: false,
+		},
+		{
+			name:    "csv pipe separated",
+			args:    args{content: "foo|bar\nbaz|qux"},
+			wantErr: false,
+		},
+		{
+			name:    "csv with quotes",
+			args:    args{content: "\"foo\",\"bar\"\n\"baz\",\"qux\""},
+			wantErr: false,
+		},
+		{
+			name:    "csv with quotes and commas",
+			args:    args{content: "\"foo,bar\",\"baz,qux\"\n\"foo,bar\",\"baz,qux\""},
+			wantErr: false,
+		},
+		{
+			name:    "different number of columns per line",
+			args:    args{content: "foo,bar\nbaz"},
+			wantErr: true,
+		},
+		{
+			name:    "empty lines",
+			args:    args{content: "foo,bar\n\nbaz,qux"},
+			wantErr: false,
+		},
+		{
+			name:    "different separators per line",
+			args:    args{content: "foo,bar\nbaz;qux"},
+			wantErr: true,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if err := IsCSV(tt.args.content); (err != nil) != tt.wantErr {
+				t.Errorf("IsCSV() error = %v, wantErr %v", err, tt.wantErr)
+			}
+		})
+	}
+}

types/csv/errors.go

@@ -0,0 +1,7 @@
+package csv
+
+import "errors"
+
+var (
+	ErrEmptyContent = errors.New("empty content")
+)