diff options
Diffstat (limited to 'vendor/github.com/tdewolff/parse/buffer/lexer_test.go')
-rw-r--r-- | vendor/github.com/tdewolff/parse/buffer/lexer_test.go | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/vendor/github.com/tdewolff/parse/buffer/lexer_test.go b/vendor/github.com/tdewolff/parse/buffer/lexer_test.go new file mode 100644 index 0000000..1317dd0 --- /dev/null +++ b/vendor/github.com/tdewolff/parse/buffer/lexer_test.go @@ -0,0 +1,91 @@ +package buffer // import "github.com/tdewolff/parse/buffer" + +import ( + "bytes" + "io" + "testing" + + "github.com/tdewolff/test" +) + +func TestLexer(t *testing.T) { + s := `Lorem ipsum dolor sit amet, consectetur adipiscing elit.` + z := NewLexer(bytes.NewBufferString(s)) + + test.T(t, z.err, nil, "buffer has no error") + test.T(t, z.Err(), nil, "buffer is at EOF but must not return EOF until we reach that") + test.That(t, z.Pos() == 0, "buffer must start at position 0") + test.That(t, z.Peek(0) == 'L', "first character must be 'L'") + test.That(t, z.Peek(1) == 'o', "second character must be 'o'") + + z.Move(1) + test.That(t, z.Peek(0) == 'o', "must be 'o' at position 1") + test.That(t, z.Peek(1) == 'r', "must be 'r' at position 1") + z.Rewind(6) + test.That(t, z.Peek(0) == 'i', "must be 'i' at position 6") + test.That(t, z.Peek(1) == 'p', "must be 'p' at position 7") + + test.Bytes(t, z.Lexeme(), []byte("Lorem "), "buffered string must now read 'Lorem ' when at position 6") + test.Bytes(t, z.Shift(), []byte("Lorem "), "shift must return the buffered string") + test.That(t, z.Pos() == 0, "after shifting position must be 0") + test.That(t, z.Peek(0) == 'i', "must be 'i' at position 0 after shifting") + test.That(t, z.Peek(1) == 'p', "must be 'p' at position 1 after shifting") + test.T(t, z.Err(), nil, "error must be nil at this point") + + z.Move(len(s) - len("Lorem ") - 1) + test.T(t, z.Err(), nil, "error must be nil just before the end of the buffer") + z.Skip() + test.That(t, z.Pos() == 0, "after skipping position must be 0") + z.Move(1) + test.T(t, z.Err(), io.EOF, "error must be EOF when past the buffer") + z.Move(-1) + test.T(t, z.Err(), nil, "error must be nil just before the end of the buffer, even when it has been past the buffer") +} + +func TestLexerRunes(t *testing.T) { + z := NewLexer(bytes.NewBufferString("aæ†\U00100000")) + r, n := z.PeekRune(0) + test.That(t, n == 1, "first character must be length 1") + test.That(t, r == 'a', "first character must be rune 'a'") + r, n = z.PeekRune(1) + test.That(t, n == 2, "second character must be length 2") + test.That(t, r == 'æ', "second character must be rune 'æ'") + r, n = z.PeekRune(3) + test.That(t, n == 3, "fourth character must be length 3") + test.That(t, r == '†', "fourth character must be rune '†'") + r, n = z.PeekRune(6) + test.That(t, n == 4, "seventh character must be length 4") + test.That(t, r == '\U00100000', "seventh character must be rune '\U00100000'") +} + +func TestLexerBadRune(t *testing.T) { + z := NewLexer(bytes.NewBufferString("\xF0")) // expect four byte rune + r, n := z.PeekRune(0) + test.T(t, n, 1, "length") + test.T(t, r, rune(0xF0), "rune") +} + +func TestLexerZeroLen(t *testing.T) { + z := NewLexer(test.NewPlainReader(bytes.NewBufferString(""))) + test.That(t, z.Peek(0) == 0, "first character must yield error") +} + +func TestLexerEmptyReader(t *testing.T) { + z := NewLexer(test.NewEmptyReader()) + test.That(t, z.Peek(0) == 0, "first character must yield error") + test.T(t, z.Err(), io.EOF, "error must be EOF") + test.That(t, z.Peek(0) == 0, "second peek must also yield error") +} + +func TestLexerErrorReader(t *testing.T) { + z := NewLexer(test.NewErrorReader(0)) + test.That(t, z.Peek(0) == 0, "first character must yield error") + test.T(t, z.Err(), test.ErrPlain, "error must be ErrPlain") + test.That(t, z.Peek(0) == 0, "second peek must also yield error") +} + +func TestLexerBytes(t *testing.T) { + b := []byte{'t', 'e', 's', 't'} + z := NewLexerBytes(b) + test.That(t, z.Peek(4) == 0, "fifth character must yield NULL") +} |