87 lines
2.0 KiB
Go
87 lines
2.0 KiB
Go
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package parsec
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import (
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"testing"
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"github.com/stretchr/testify/require"
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)
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func TestPointer(t *testing.T) {
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p := Pointer{"fooo", 0}
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t.Run("Advances", func(t *testing.T) {
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p2 := p.Advance(2)
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require.Equal(t, Pointer{"fooo", 2}, p2)
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require.Equal(t, Pointer{"fooo", 0}, p)
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require.Equal(t, Pointer{"fooo", 3}, p2.Advance(1))
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})
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t.Run("Get", func(t *testing.T) {
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require.Equal(t, "fooo", p.Get())
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require.Equal(t, "ooo", p.Advance(1).Get())
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})
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t.Run("Remaining", func(t *testing.T) {
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require.Equal(t, 4, p.Remaining())
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require.Equal(t, 0, p.Advance(4).Remaining())
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require.Equal(t, 0, p.Advance(10).Remaining())
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})
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t.Run("Next takes one character", func(t *testing.T) {
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s, p2 := p.Next()
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require.Equal(t, p.Advance(1), p2)
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require.Equal(t, 'f', s)
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})
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t.Run("Next handles EOF", func(t *testing.T) {
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s, p2 := p.Advance(5).Next()
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require.Equal(t, p.Advance(5), p2)
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require.Equal(t, EOF, s)
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})
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t.Run("HasPrefix", func(t *testing.T) {
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require.True(t, p.HasPrefix("fo"))
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require.False(t, p.HasPrefix("ooo"))
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require.True(t, p.Advance(1).HasPrefix("ooo"))
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require.False(t, p.Advance(1).HasPrefix("oooo"))
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})
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t.Run("Accept", func(t *testing.T) {
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s, p2 := p.Accept("abcdef")
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require.Equal(t, "f", s)
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require.Equal(t, p.Advance(1), p2)
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s, p2 = p.Accept("ooooo")
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require.Equal(t, "", s)
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require.Equal(t, p.Advance(0), p2)
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s, p2 = p.Advance(4).Accept("ooooo")
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require.Equal(t, "", s)
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require.Equal(t, p.Advance(4), p2)
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})
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t.Run("AcceptRun", func(t *testing.T) {
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s, p2 := p.AcceptRun("f")
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require.Equal(t, "f", s)
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require.Equal(t, p.Advance(1), p2)
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s, p3 := p.AcceptRun("fo")
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require.Equal(t, "fooo", s)
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require.Equal(t, p.Advance(4), p3)
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s, p4 := p3.AcceptRun("fo")
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require.Equal(t, "", s)
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require.Equal(t, p.Advance(4), p4)
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})
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t.Run("AcceptUntil", func(t *testing.T) {
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s, p2 := p.AcceptUntil("o")
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require.Equal(t, "f", s)
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require.Equal(t, p.Advance(1), p2)
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s, p3 := p2.AcceptRun("o")
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require.Equal(t, "ooo", s)
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require.Equal(t, p.Advance(4), p3)
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})
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}
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