69 lines
2.1 KiB
Go
69 lines
2.1 KiB
Go
package gigaparsec_test
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import (
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"bytes"
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"testing"
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"git.codemonkeysoftware.net/b/gigaparsec"
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"git.codemonkeysoftware.net/b/gigaparsec/cursor"
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"github.com/shoenig/test"
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"pgregory.net/rapid"
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)
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func Todo(t *testing.T) {
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t.Errorf("TODO")
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}
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func not[T any](pred func(T) bool) func(T) bool {
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return func(x T) bool { return !pred(x) }
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}
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func hasPrefix(prefix []byte) func([]byte) bool {
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return func(b []byte) bool { return bytes.HasPrefix(b, prefix) }
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}
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func TestSlice(t *testing.T) {
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assertParseFails := func(t rapid.TB, input []byte, p gigaparsec.Parser[byte, []byte]) (parseErr gigaparsec.ParseError) {
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t.Helper()
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start := gigaparsec.MakeState(cursor.NewSlice(input))
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consumed, result, err := p(start)
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test.ErrorAs(t, err, &parseErr, test.Sprint("expected ParseError"))
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test.False(t, consumed, test.Sprint("expected consumed to be false"))
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test.SliceEmpty(t, result.Value, test.Sprint("expected result value to be empty"))
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if t.Failed() {
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t.FailNow()
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}
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return parseErr
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}
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t.Run("fails with wrong contents", rapid.MakeCheck(func(t *rapid.T) {
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s := rapid.SliceOfN(rapid.Byte(), 1, -1).Draw(t, "s")
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input := rapid.SliceOfN(rapid.Byte(), len(s), -1).
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Filter(not(hasPrefix(s))).Draw(t, "input")
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assertParseFails(t, input, gigaparsec.Slice(s))
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}))
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t.Run("fails at end of input", rapid.MakeCheck(func(t *rapid.T) {
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s := rapid.SliceOfN(rapid.Byte(), 1, -1).Draw(t, "s")
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inputLen := rapid.IntRange(0, len(s)-1).Draw(t, "inputLen")
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input := s[:inputLen]
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assertParseFails(t, input, gigaparsec.Slice(s))
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}))
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t.Run("fails when read fails", Todo)
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t.Run("succeeds when contents match", rapid.MakeCheck(func(t *rapid.T) {
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input := rapid.SliceOfN(rapid.Byte(), 1, -1).Draw(t, "input")
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sLen := rapid.IntRange(0, len(input)).Draw(t, "sLen")
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s := input[:sLen]
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start := gigaparsec.MakeState(cursor.NewSlice(input))
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consumed, result, err := gigaparsec.Slice(s)(start)
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test.NoError(t, err)
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test.True(t, consumed, test.Sprint("expected consumed to be true"))
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test.SliceEqOp(t, s, result.Value)
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test.EqOp(t, uint64(len(s)), result.State.Pos())
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}))
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}
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func TestChoose(t *testing.T) {
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Todo(t)
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}
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