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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 parser
import (
"fmt"
"go/ast"
"go/token"
"os"
"testing"
)
var fset = token.NewFileSet()
var validFiles = []string{
"parser.go",
"parser_test.go",
"error_test.go",
"short_test.go",
}
func TestParse(t *testing.T) {
for _, filename := range validFiles {
_, err := ParseFile(fset, filename, nil, DeclarationErrors)
if err != nil {
t.Errorf("ParseFile(%s): %v", filename, err)
}
}
}
func nameFilter(filename string) bool {
switch filename {
case "parser.go":
case "interface.go":
case "parser_test.go":
default:
return false
}
return true
}
func dirFilter(f os.FileInfo) bool { return nameFilter(f.Name()) }
func TestParseDir(t *testing.T) {
path := "."
pkgs, err := ParseDir(fset, path, dirFilter, 0)
if err != nil {
t.Fatalf("ParseDir(%s): %v", path, err)
}
if len(pkgs) != 1 {
t.Errorf("incorrect number of packages: %d", len(pkgs))
}
pkg := pkgs["parser"]
if pkg == nil {
t.Errorf(`package "parser" not found`)
return
}
for filename := range pkg.Files {
if !nameFilter(filename) {
t.Errorf("unexpected package file: %s", filename)
}
}
}
func TestParseExpr(t *testing.T) {
// just kicking the tires:
// a valid expression
src := "a + b"
x, err := ParseExpr(src)
if err != nil {
t.Errorf("ParseExpr(%s): %v", src, err)
}
// sanity check
if _, ok := x.(*ast.BinaryExpr); !ok {
t.Errorf("ParseExpr(%s): got %T, expected *ast.BinaryExpr", src, x)
}
// an invalid expression
src = "a + *"
_, err = ParseExpr(src)
if err == nil {
t.Errorf("ParseExpr(%s): %v", src, err)
}
// it must not crash
for _, src := range valids {
ParseExpr(src)
}
}
func TestColonEqualsScope(t *testing.T) {
f, err := ParseFile(fset, "", `package p; func f() { x, y, z := x, y, z }`, 0)
if err != nil {
t.Errorf("parse: %s", err)
}
// RHS refers to undefined globals; LHS does not.
as := f.Decls[0].(*ast.FuncDecl).Body.List[0].(*ast.AssignStmt)
for _, v := range as.Rhs {
id := v.(*ast.Ident)
if id.Obj != nil {
t.Errorf("rhs %s has Obj, should not", id.Name)
}
}
for _, v := range as.Lhs {
id := v.(*ast.Ident)
if id.Obj == nil {
t.Errorf("lhs %s does not have Obj, should", id.Name)
}
}
}
func TestVarScope(t *testing.T) {
f, err := ParseFile(fset, "", `package p; func f() { var x, y, z = x, y, z }`, 0)
if err != nil {
t.Errorf("parse: %s", err)
}
// RHS refers to undefined globals; LHS does not.
as := f.Decls[0].(*ast.FuncDecl).Body.List[0].(*ast.DeclStmt).Decl.(*ast.GenDecl).Specs[0].(*ast.ValueSpec)
for _, v := range as.Values {
id := v.(*ast.Ident)
if id.Obj != nil {
t.Errorf("rhs %s has Obj, should not", id.Name)
}
}
for _, id := range as.Names {
if id.Obj == nil {
t.Errorf("lhs %s does not have Obj, should", id.Name)
}
}
}
var imports = map[string]bool{
`"a"`: true,
"`a`": true,
`"a/b"`: true,
`"a.b"`: true,
`"m\x61th"`: true,
`"greek/αβ"`: true,
`""`: false,
// Each of these pairs tests both `` vs "" strings
// and also use of invalid characters spelled out as
// escape sequences and written directly.
// For example `"\x00"` tests import "\x00"
// while "`\x00`" tests import `<actual-NUL-byte>`.
`"\x00"`: false,
"`\x00`": false,
`"\x7f"`: false,
"`\x7f`": false,
`"a!"`: false,
"`a!`": false,
`"a b"`: false,
"`a b`": false,
`"a\\b"`: false,
"`a\\b`": false,
"\"`a`\"": false,
"`\"a\"`": false,
`"\x80\x80"`: false,
"`\x80\x80`": false,
`"\xFFFD"`: false,
"`\xFFFD`": false,
}
func TestImports(t *testing.T) {
for path, isValid := range imports {
src := fmt.Sprintf("package p; import %s", path)
_, err := ParseFile(fset, "", src, 0)
switch {
case err != nil && isValid:
t.Errorf("ParseFile(%s): got %v; expected no error", src, err)
case err == nil && !isValid:
t.Errorf("ParseFile(%s): got no error; expected one", src)
}
}
}
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