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