74 строки
1.3 KiB
Go
74 строки
1.3 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package ebnf
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import (
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"bytes"
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"testing"
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)
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var goodGrammars = []string{
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`Program = .`,
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`Program = foo .
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foo = "foo" .`,
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`Program = "a" | "b" "c" .`,
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`Program = "a" … "z" .`,
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`Program = Song .
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Song = { Note } .
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Note = Do | (Re | Mi | Fa | So | La) | Ti .
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Do = "c" .
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Re = "d" .
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Mi = "e" .
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Fa = "f" .
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So = "g" .
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La = "a" .
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Ti = ti .
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ti = "b" .`,
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"Program = `\"` .",
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}
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var badGrammars = []string{
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`Program = | .`,
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`Program = | b .`,
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`Program = a … b .`,
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`Program = "a" … .`,
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`Program = … "b" .`,
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`Program = () .`,
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`Program = [] .`,
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`Program = {} .`,
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}
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func checkGood(t *testing.T, src string) {
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grammar, err := Parse("", bytes.NewBuffer([]byte(src)))
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if err != nil {
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t.Errorf("Parse(%s) failed: %v", src, err)
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return
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}
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if err = Verify(grammar, "Program"); err != nil {
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t.Errorf("Verify(%s) failed: %v", src, err)
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}
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}
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func checkBad(t *testing.T, src string) {
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_, err := Parse("", bytes.NewBuffer([]byte(src)))
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if err == nil {
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t.Errorf("Parse(%s) should have failed", src)
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}
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}
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func TestGrammars(t *testing.T) {
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for _, src := range goodGrammars {
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checkGood(t, src)
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}
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for _, src := range badGrammars {
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checkBad(t, src)
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}
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}
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