added generic tokenizer helper

tools/tokenizer/tokenizer_test.go

@@ -0,0 +1,185 @@
+package tokenizer
+
+import (
+	"io"
+	"strings"
+	"testing"
+)
+
+func TestFactories(t *testing.T) {
+	expectedContent := "test"
+
+	scenarios := []struct {
+		name string
+		tk   *Tokenizer
+	}{
+		{
+			"New()",
+			New(strings.NewReader(expectedContent)),
+		},
+		{
+			"NewFromString()",
+			NewFromString(expectedContent),
+		},
+		{
+			"NewFromBytes()",
+			NewFromBytes([]byte(expectedContent)),
+		},
+	}
+
+	for _, s := range scenarios {
+		content, _ := s.tk.r.ReadString(0)
+
+		if content != expectedContent {
+			t.Fatalf("[%s] Expected reader with content %q, got %q", s.name, expectedContent, content)
+		}
+
+		if len(s.tk.separators) != len(DefaultSeparators) {
+			t.Fatalf("[%s] Expected \n%v, \ngot \n%v", s.name, DefaultSeparators, s.tk.separators)
+		}
+
+		for _, r := range s.tk.separators {
+			exists := false
+			for _, def := range s.tk.separators {
+				if r == def {
+					exists = true
+					break
+				}
+			}
+			if !exists {
+				t.Fatalf("[%s] Unexpected sepator %s", s.name, string(r))
+			}
+		}
+	}
+}
+
+func TestScan(t *testing.T) {
+	tk := NewFromString("abc 123.456 (abc)")
+
+	expectedTokens := []string{"abc", "123.456", "(abc)"}
+
+	for _, token := range expectedTokens {
+		result, err := tk.Scan()
+		if err != nil {
+			t.Fatalf("Expected token %q, got error %v", token, err)
+		}
+
+		if result != token {
+			t.Fatalf("Expected token %q, got error %v", token, result)
+		}
+	}
+
+	// scan the last character
+	token, err := tk.Scan()
+	if err != io.EOF {
+		t.Fatalf("Expected EOF error, got %v", err)
+	}
+	if token != "" || err != io.EOF {
+		t.Fatalf("Expected empty token, got %q", token)
+	}
+}
+
+func TestScanAllWithDefaultSeparators(t *testing.T) {
+	scenarios := []struct {
+		name         string
+		content      string
+		separators   []rune
+		expectError  bool
+		expectTokens []string
+	}{
+		{
+			"empty string",
+			"",
+			DefaultSeparators,
+			false,
+			nil,
+		},
+		{
+			"unbalanced parenthesis",
+			`(a,b() c`,
+			DefaultSeparators,
+			true,
+			[]string{},
+		},
+		{
+			"unmatching quotes",
+			`'asd"`,
+			DefaultSeparators,
+			true,
+			[]string{},
+		},
+		{
+			"no separators",
+			`a, b, c, d, e 123, "abc"`,
+			nil,
+			false,
+			[]string{
+				`a, b, c, d, e 123, "abc"`,
+			},
+		},
+		{
+			"default separators",
+			`   a   , 123.456, b, c d, (
+				test (a,b,c) " 123 "
+			),"(abc d", "abc) d", "(abc) d \" " 'abc "'`,
+			DefaultSeparators,
+			false,
+			[]string{
+				"a",
+				"123.456",
+				"b",
+				"c",
+				"d",
+				"(\n\t\t\t\ttest (a,b,c) \" 123 \"\n\t\t\t)",
+				`"(abc d"`,
+				`"abc) d"`,
+				`"(abc) d \" "`,
+				`'abc "'`,
+			},
+		},
+		{
+			"custom separators",
+			`a, b, c, d e, "a,b,  c  ", (123, 456)`,
+			[]rune{','},
+			false,
+			[]string{
+				"a",
+				"b",
+				"c",
+				"d e",
+				`"a,b,  c  "`,
+				`(123, 456)`,
+			},
+		},
+	}
+
+	for _, s := range scenarios {
+		tk := NewFromString(s.content)
+
+		tk.SetSeparators(s.separators...)
+
+		tokens, err := tk.ScanAll()
+
+		hasErr := err != nil
+		if hasErr != s.expectError {
+			t.Fatalf("[%s] Expected hasErr %v, got %v (%v)", s.name, s.expectError, hasErr, err)
+		}
+
+		if len(tokens) != len(s.expectTokens) {
+			t.Fatalf("[%s] Expected \n%v, \ngot \n%v", s.name, s.expectTokens, tokens)
+		}
+
+		for _, tok := range tokens {
+			exists := false
+			for _, def := range s.expectTokens {
+				if tok == def {
+					exists = true
+					break
+				}
+			}
+			if !exists {
+				t.Fatalf("[%s] Unexpected token %s", s.name, tok)
+			}
+		}
+	}
+}