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|
package driver
import (
"strings"
"testing"
"github.com/nihei9/vartan/grammar"
"github.com/nihei9/vartan/spec"
)
func TestParser_Parse(t *testing.T) {
specSrc := `
expr
: expr "\+" term
| term
;
term
: term "\*" factor
| factor
;
factor
: "\(" expr "\)"
| id
;
id: "[A-Za-z_][0-9A-Za-z_]*";
`
ast, err := spec.Parse(strings.NewReader(specSrc))
if err != nil {
t.Fatal(err)
}
g, err := grammar.NewGrammar(ast)
if err != nil {
t.Fatal(err)
}
gram, err := grammar.Compile(g)
if err != nil {
t.Fatal(err)
}
src := `(a+(b+c))*d+e`
p, err := NewParser(gram, strings.NewReader(src))
if err != nil {
t.Fatal(err)
}
err = p.Parse()
if err != nil {
t.Fatal(err)
}
printCST(p.GetCST(), 0)
}
|
