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package buffer
import (
"bytes"
"io"
"testing"
"github.com/tdewolff/test"
)
func TestBufferPool(t *testing.T) {
z := &bufferPool{}
lorem := []byte("Lorem ipsum")
dolor := []byte("dolor sit amet")
consectetur := []byte("consectetur adipiscing elit")
// set lorem as first buffer and get new dolor buffer
b := z.swap(lorem, len(dolor))
test.That(t, len(b) == 0)
test.That(t, cap(b) == len(dolor))
b = append(b, dolor...)
// free first buffer so it will be reused
z.free(len(lorem))
b = z.swap(b, len(lorem))
b = b[:len(lorem)]
test.Bytes(t, b, lorem)
b = z.swap(b, len(consectetur))
b = append(b, consectetur...)
// free in advance to reuse the same buffer
z.free(len(dolor) + len(lorem) + len(consectetur))
test.That(t, z.head == 0)
b = z.swap(b, len(consectetur))
b = b[:len(consectetur)]
test.Bytes(t, b, consectetur)
// free in advance but request larger buffer
z.free(len(consectetur))
b = z.swap(b, len(consectetur)+1)
b = append(b, consectetur...)
b = append(b, '.')
test.That(t, cap(b) == len(consectetur)+1)
}
func TestStreamLexer(t *testing.T) {
s := `Lorem ipsum dolor sit amet, consectetur adipiscing elit.`
z := NewStreamLexer(bytes.NewBufferString(s))
test.T(t, z.err, io.EOF, "buffer must be fully in memory")
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.ShiftLen() == len("Lorem "), "shifted length must equal last shift")
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")
z.Free(0) // has already been tested
}
func TestStreamLexerShift(t *testing.T) {
s := `Lorem ipsum dolor sit amet, consectetur adipiscing elit.`
z := NewStreamLexerSize(test.NewPlainReader(bytes.NewBufferString(s)), 5)
z.Move(len("Lorem "))
test.Bytes(t, z.Shift(), []byte("Lorem "), "shift must return the buffered string")
test.That(t, z.ShiftLen() == len("Lorem "), "shifted length must equal last shift")
}
func TestStreamLexerSmall(t *testing.T) {
s := `abcdefghijklm`
z := NewStreamLexerSize(test.NewPlainReader(bytes.NewBufferString(s)), 4)
test.That(t, z.Peek(8) == 'i', "first character must be 'i' at position 8")
z = NewStreamLexerSize(test.NewPlainReader(bytes.NewBufferString(s)), 4)
test.That(t, z.Peek(12) == 'm', "first character must be 'm' at position 12")
z = NewStreamLexerSize(test.NewPlainReader(bytes.NewBufferString(s)), 0)
test.That(t, z.Peek(4) == 'e', "first character must be 'e' at position 4")
z = NewStreamLexerSize(test.NewPlainReader(bytes.NewBufferString(s)), 13)
test.That(t, z.Peek(13) == 0, "must yield error at position 13")
}
func TestStreamLexerSingle(t *testing.T) {
z := NewStreamLexer(test.NewInfiniteReader())
test.That(t, z.Peek(0) == '.')
test.That(t, z.Peek(1) == '.')
test.That(t, z.Peek(3) == '.', "required two successful reads")
}
func TestStreamLexerRunes(t *testing.T) {
z := NewStreamLexer(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 TestStreamLexerBadRune(t *testing.T) {
z := NewStreamLexer(bytes.NewBufferString("\xF0")) // expect four byte rune
r, n := z.PeekRune(0)
test.T(t, n, 4, "length")
test.T(t, r, rune(0), "rune")
}
func TestStreamLexerZeroLen(t *testing.T) {
z := NewStreamLexer(test.NewPlainReader(bytes.NewBufferString("")))
test.That(t, z.Peek(0) == 0, "first character must yield error")
}
func TestStreamLexerEmptyReader(t *testing.T) {
z := NewStreamLexer(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")
}
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