53 lines
1.1 KiB
Go
53 lines
1.1 KiB
Go
// SPDX-License-Identifier: Unlicense
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// Package test contains helpers for testing parsers.
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package test
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import (
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"io"
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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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)
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type errReaderAt struct {
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err error
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}
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func (r errReaderAt) ReadAt([]byte, int64) (int, error) {
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return 0, r.err
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}
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// ErrReaderAt returns an [io.ReaderAt] with a ReadAt method that always returns err.
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func ErrReaderAt(err error) io.ReaderAt {
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return errReaderAt{err: err}
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}
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type errCursor[T any] struct {
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err error
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pos uint64
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}
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func (c errCursor[T]) Read([]T) (uint64, cursor.Cursor[T], error) {
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return 0, c, c.err
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}
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func (c errCursor[T]) At(pos uint64) cursor.Cursor[T] {
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c.pos = pos
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return c
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}
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func (c errCursor[T]) Pos() uint64 {
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return c.pos
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}
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// ErrCursor return a [cursor.Cursor] with a Read method that always returns err.
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func ErrCursor[T any](err error) cursor.Cursor[T] {
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return errCursor[T]{err: err}
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}
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func StateIsAt[Input any](t test.T, s gigaparsec.State[Input], pos uint64) {
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test.EqOp(t, pos, s.Pos(), test.Sprintf("expected parser state to be at position %d, got %d", pos, s.Pos()))
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}
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