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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 (
"go/ast"
"go/token"
"os"
"testing"
)
var fset = token.NewFileSet()
var illegalInputs = []interface{}{
nil,
3.14,
[]byte(nil),
"foo!",
`package p; func f() { if /* should have condition */ {} };`,
`package p; func f() { if ; /* should have condition */ {} };`,
`package p; func f() { if f(); /* should have condition */ {} };`,
`package p; const c; /* should have constant value */`,
`package p; func f() { if _ = range x; true {} };`,
`package p; func f() { switch _ = range x; true {} };`,
`package p; func f() { for _ = range x ; ; {} };`,
`package p; func f() { for ; ; _ = range x {} };`,
`package p; func f() { for ; _ = range x ; {} };`,
`package p; func f() { switch t = t.(type) {} };`,
`package p; func f() { switch t, t = t.(type) {} };`,
`package p; func f() { switch t = t.(type), t {} };`,
`package p; var a = [1]int; /* illegal expression */`,
`package p; var a = [...]int; /* illegal expression */`,
`package p; var a = struct{} /* illegal expression */`,
`package p; var a = func(); /* illegal expression */`,
`package p; var a = interface{} /* illegal expression */`,
`package p; var a = []int /* illegal expression */`,
`package p; var a = map[int]int /* illegal expression */`,
`package p; var a = chan int; /* illegal expression */`,
`package p; var a = []int{[]int}; /* illegal expression */`,
`package p; var a = ([]int); /* illegal expression */`,
`package p; var a = a[[]int:[]int]; /* illegal expression */`,
`package p; var a = <- chan int; /* illegal expression */`,
`package p; func f() { select { case _ <- chan int: } };`,
}
func TestParseIllegalInputs(t *testing.T) {
for _, src := range illegalInputs {
_, err := ParseFile(fset, "", src, 0)
if err == nil {
t.Errorf("ParseFile(%v) should have failed", src)
}
}
}
var validPrograms = []string{
"package p\n",
`package p;`,
`package p; import "fmt"; func f() { fmt.Println("Hello, World!") };`,
`package p; func f() { if f(T{}) {} };`,
`package p; func f() { _ = (<-chan int)(x) };`,
`package p; func f() { _ = (<-chan <-chan int)(x) };`,
`package p; func f(func() func() func());`,
`package p; func f(...T);`,
`package p; func f(float, ...int);`,
`package p; func f(x int, a ...int) { f(0, a...); f(1, a...,) };`,
`package p; func f(int,) {};`,
`package p; func f(...int,) {};`,
`package p; func f(x ...int,) {};`,
`package p; type T []int; var a []bool; func f() { if a[T{42}[0]] {} };`,
`package p; type T []int; func g(int) bool { return true }; func f() { if g(T{42}[0]) {} };`,
`package p; type T []int; func f() { for _ = range []int{T{42}[0]} {} };`,
`package p; var a = T{{1, 2}, {3, 4}}`,
`package p; func f() { select { case <- c: case c <- d: case c <- <- d: case <-c <- d: } };`,
`package p; func f() { select { case x := (<-c): } };`,
`package p; func f() { if ; true {} };`,
`package p; func f() { switch ; {} };`,
`package p; func f() { for _ = range "foo" + "bar" {} };`,
}
func TestParseValidPrograms(t *testing.T) {
for _, src := range validPrograms {
_, err := ParseFile(fset, "", src, SpuriousErrors)
if err != nil {
t.Errorf("ParseFile(%q): %v", src, err)
}
}
}
var validFiles = []string{
"parser.go",
"parser_test.go",
}
func TestParse3(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 TestParse4(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 validPrograms {
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)
}
}
}
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