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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 eval
import (
"big"
"flag"
"fmt"
"go/token"
"log"
"os"
"reflect"
"regexp"
"testing"
)
// All tests are done using the same file set.
var fset = token.NewFileSet()
// Print each statement or expression before parsing it
var noisy = false
func init() { flag.BoolVar(&noisy, "noisy", false, "chatter during eval tests") }
/*
* Generic statement/expression test framework
*/
type test []job
type job struct {
code string
cerr string
rterr string
val Value
noval bool
}
func runTests(t *testing.T, baseName string, tests []test) {
for i, test := range tests {
name := fmt.Sprintf("%s[%d]", baseName, i)
test.run(t, name)
}
}
func (a test) run(t *testing.T, name string) {
w := newTestWorld()
for _, j := range a {
src := j.code + ";" // trailing semicolon to finish statement
if noisy {
println("code:", src)
}
code, err := w.Compile(fset, src)
if err != nil {
if j.cerr == "" {
t.Errorf("%s: Compile %s: %v", name, src, err)
break
}
if !match(t, err, j.cerr) {
t.Errorf("%s: Compile %s = error %s; want %v", name, src, err, j.cerr)
break
}
continue
}
if j.cerr != "" {
t.Errorf("%s: Compile %s succeeded; want %s", name, src, j.cerr)
break
}
val, err := code.Run()
if err != nil {
if j.rterr == "" {
t.Errorf("%s: Run %s: %v", name, src, err)
break
}
if !match(t, err, j.rterr) {
t.Errorf("%s: Run %s = error %s; want %v", name, src, err, j.rterr)
break
}
continue
}
if j.rterr != "" {
t.Errorf("%s: Run %s succeeded; want %s", name, src, j.rterr)
break
}
if !j.noval && !reflect.DeepEqual(val, j.val) {
t.Errorf("%s: Run %s = %T(%v) want %T(%v)", name, src, val, val, j.val, j.val)
}
}
}
func match(t *testing.T, err os.Error, pat string) bool {
ok, err1 := regexp.MatchString(pat, err.String())
if err1 != nil {
t.Fatalf("compile regexp %s: %v", pat, err1)
}
return ok
}
/*
* Test constructors
*/
// Expression compile error
func CErr(expr string, cerr string) test { return test([]job{{code: expr, cerr: cerr}}) }
// Expression runtime error
func RErr(expr string, rterr string) test { return test([]job{{code: expr, rterr: rterr}}) }
// Expression value
func Val(expr string, val interface{}) test {
return test([]job{{code: expr, val: toValue(val)}})
}
// Statement runs without error
func Run(stmts string) test { return test([]job{{code: stmts, noval: true}}) }
// Two statements without error.
// TODO(rsc): Should be possible with Run but the parser
// won't let us do both top-level and non-top-level statements.
func Run2(stmt1, stmt2 string) test {
return test([]job{{code: stmt1, noval: true}, {code: stmt2, noval: true}})
}
// Statement runs and test one expression's value
func Val1(stmts string, expr1 string, val1 interface{}) test {
return test([]job{
{code: stmts, noval: true},
{code: expr1, val: toValue(val1)},
})
}
// Statement runs and test two expressions' values
func Val2(stmts string, expr1 string, val1 interface{}, expr2 string, val2 interface{}) test {
return test([]job{
{code: stmts, noval: true},
{code: expr1, val: toValue(val1)},
{code: expr2, val: toValue(val2)},
})
}
/*
* Value constructors
*/
type vstruct []interface{}
type varray []interface{}
type vslice struct {
arr varray
len, cap int
}
func toValue(val interface{}) Value {
switch val := val.(type) {
case bool:
r := boolV(val)
return &r
case uint8:
r := uint8V(val)
return &r
case uint:
r := uintV(val)
return &r
case int:
r := intV(val)
return &r
case *big.Int:
return &idealIntV{val}
case float64:
r := float64V(val)
return &r
case *big.Rat:
return &idealFloatV{val}
case string:
r := stringV(val)
return &r
case vstruct:
elems := make([]Value, len(val))
for i, e := range val {
elems[i] = toValue(e)
}
r := structV(elems)
return &r
case varray:
elems := make([]Value, len(val))
for i, e := range val {
elems[i] = toValue(e)
}
r := arrayV(elems)
return &r
case vslice:
return &sliceV{Slice{toValue(val.arr).(ArrayValue), int64(val.len), int64(val.cap)}}
case Func:
return &funcV{val}
}
log.Panicf("toValue(%T) not implemented", val)
panic("unreachable")
}
/*
* Default test scope
*/
type testFunc struct{}
func (*testFunc) NewFrame() *Frame { return &Frame{nil, make([]Value, 2)} }
func (*testFunc) Call(t *Thread) {
n := t.f.Vars[0].(IntValue).Get(t)
res := n + 1
t.f.Vars[1].(IntValue).Set(t, res)
}
type oneTwoFunc struct{}
func (*oneTwoFunc) NewFrame() *Frame { return &Frame{nil, make([]Value, 2)} }
func (*oneTwoFunc) Call(t *Thread) {
t.f.Vars[0].(IntValue).Set(t, 1)
t.f.Vars[1].(IntValue).Set(t, 2)
}
type voidFunc struct{}
func (*voidFunc) NewFrame() *Frame { return &Frame{nil, []Value{}} }
func (*voidFunc) Call(t *Thread) {}
func newTestWorld() *World {
w := NewWorld()
def := func(name string, t Type, val interface{}) { w.DefineVar(name, t, toValue(val)) }
w.DefineConst("c", IdealIntType, toValue(big.NewInt(1)))
def("i", IntType, 1)
def("i2", IntType, 2)
def("u", UintType, uint(1))
def("f", Float64Type, 1.0)
def("s", StringType, "abc")
def("t", NewStructType([]StructField{{"a", IntType, false}}), vstruct{1})
def("ai", NewArrayType(2, IntType), varray{1, 2})
def("aai", NewArrayType(2, NewArrayType(2, IntType)), varray{varray{1, 2}, varray{3, 4}})
def("aai2", NewArrayType(2, NewArrayType(2, IntType)), varray{varray{5, 6}, varray{7, 8}})
def("fn", NewFuncType([]Type{IntType}, false, []Type{IntType}), &testFunc{})
def("oneTwo", NewFuncType([]Type{}, false, []Type{IntType, IntType}), &oneTwoFunc{})
def("void", NewFuncType([]Type{}, false, []Type{}), &voidFunc{})
def("sli", NewSliceType(IntType), vslice{varray{1, 2, 3}, 2, 3})
return w
}
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