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go/usr/austin/eval/value.go
Austin Clements 79fac7ca86 Implement array types and index expressions. 
Some cleanup.  Elem() on PtrType is now just Elem and matches
with ArrayType.  Generators now switch over the result type
instead of the operand type.  Delete unused diag function.

R=rsc
APPROVED=rsc
DELTA=281  (219 added, 18 deleted, 44 changed)
OCL=31876
CL=31891
2009-07-20 17:41:40 -07:00

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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 (
"bignum";
"eval";
"fmt";
)
/*
* Bool
*/
type boolV bool
func (*boolV) Type() Type {
return BoolType;
}
func (v *boolV) String() string {
return fmt.Sprint(*v);
}
func (v *boolV) Get() bool {
return bool(*v);
}
func (v *boolV) Set(x bool) {
*v = boolV(x);
}
func (t *boolType) value(v bool) BoolValue {
res := boolV(v);
return &res;
}
/*
* Uint
*/
type uint8V uint8
func (*uint8V) Type() Type {
return Uint8Type;
}
func (v *uint8V) String() string {
return fmt.Sprint(*v);
}
func (v *uint8V) Get() uint64 {
return uint64(*v);
}
func (v *uint8V) Set(x uint64) {
*v = uint8V(x);
}
type uint16V uint16
func (*uint16V) Type() Type {
return Uint16Type;
}
func (v *uint16V) String() string {
return fmt.Sprint(*v);
}
func (v *uint16V) Get() uint64 {
return uint64(*v);
}
func (v *uint16V) Set(x uint64) {
*v = uint16V(x);
}
type uint32V uint32
func (*uint32V) Type() Type {
return Uint32Type;
}
func (v *uint32V) String() string {
return fmt.Sprint(*v);
}
func (v *uint32V) Get() uint64 {
return uint64(*v);
}
func (v *uint32V) Set(x uint64) {
*v = uint32V(x);
}
type uint64V uint64
func (*uint64V) Type() Type {
return Uint64Type;
}
func (v *uint64V) String() string {
return fmt.Sprint(*v);
}
func (v *uint64V) Get() uint64 {
return uint64(*v);
}
func (v *uint64V) Set(x uint64) {
*v = uint64V(x);
}
type uintV uint
func (*uintV) Type() Type {
return UintType;
}
func (v *uintV) String() string {
return fmt.Sprint(*v);
}
func (v *uintV) Get() uint64 {
return uint64(*v);
}
func (v *uintV) Set(x uint64) {
*v = uintV(x);
}
type uintptrV uintptr
func (*uintptrV) Type() Type {
return UintptrType;
}
func (v *uintptrV) String() string {
return fmt.Sprint(*v);
}
func (v *uintptrV) Get() uint64 {
return uint64(*v);
}
func (v *uintptrV) Set(x uint64) {
*v = uintptrV(x);
}
func (t *uintType) value(v uint64) UintValue {
// TODO(austin) The 'value' methods are only used for
// testing right now. Get rid of them.
// TODO(austin) Deal with named types
switch Type(t) {
case Uint8Type:
res := uint8V(v);
return &res;
case Uint16Type:
res := uint16V(v);
return &res;
case Uint32Type:
res := uint32V(v);
return &res;
case Uint64Type:
res := uint64V(v);
return &res;
case UintType:
res := uintV(v);
return &res;
case UintptrType:
res := uintptrV(v);
return &res;
}
panic("unknown uint type ", t.String());
}
/*
* Int
*/
type int8V int8
func (*int8V) Type() Type {
return Int8Type;
}
func (v *int8V) String() string {
return fmt.Sprint(*v);
}
func (v *int8V) Get() int64 {
return int64(*v);
}
func (v *int8V) Set(x int64) {
*v = int8V(x);
}
type int16V int16
func (*int16V) Type() Type {
return Int16Type;
}
func (v *int16V) String() string {
return fmt.Sprint(*v);
}
func (v *int16V) Get() int64 {
return int64(*v);
}
func (v *int16V) Set(x int64) {
*v = int16V(x);
}
type int32V int32
func (*int32V) Type() Type {
return Int32Type;
}
func (v *int32V) String() string {
return fmt.Sprint(*v);
}
func (v *int32V) Get() int64 {
return int64(*v);
}
func (v *int32V) Set(x int64) {
*v = int32V(x);
}
type int64V int64
func (*int64V) Type() Type {
return Int64Type;
}
func (v *int64V) String() string {
return fmt.Sprint(*v);
}
func (v *int64V) Get() int64 {
return int64(*v);
}
func (v *int64V) Set(x int64) {
*v = int64V(x);
}
type intV int
func (*intV) Type() Type {
return IntType;
}
func (v *intV) String() string {
return fmt.Sprint(*v);
}
func (v *intV) Get() int64 {
return int64(*v);
}
func (v *intV) Set(x int64) {
*v = intV(x);
}
func (t *intType) value(v int64) IntValue {
switch Type(t) {
case Int8Type:
res := int8V(v);
return &res;
case Int16Type:
res := int16V(v);
return &res;
case Int32Type:
res := int32V(v);
return &res;
case Int64Type:
res := int64V(v);
return &res;
case IntType:
res := intV(v);
return &res;
}
panic("unknown int type ", t.String());
}
/*
* Ideal int
*/
type idealIntV struct {
V *bignum.Integer;
}
func (*idealIntV) Type() Type {
return IdealIntType;
}
func (v *idealIntV) String() string {
return v.V.String();
}
func (v *idealIntV) Get() *bignum.Integer {
return v.V;
}
func (t *idealIntType) value(v *bignum.Integer) IdealIntValue {
return &idealIntV{v};
}
/*
* Float
*/
type float32V float32
func (*float32V) Type() Type {
return Float32Type;
}
func (v *float32V) String() string {
return fmt.Sprint(*v);
}
func (v *float32V) Get() float64 {
return float64(*v);
}
func (v *float32V) Set(x float64) {
*v = float32V(x);
}
type float64V float64
func (*float64V) Type() Type {
return Float64Type;
}
func (v *float64V) String() string {
return fmt.Sprint(*v);
}
func (v *float64V) Get() float64 {
return float64(*v);
}
func (v *float64V) Set(x float64) {
*v = float64V(x);
}
type floatV float
func (*floatV) Type() Type {
return FloatType;
}
func (v *floatV) String() string {
return fmt.Sprint(*v);
}
func (v *floatV) Get() float64 {
return float64(*v);
}
func (v *floatV) Set(x float64) {
*v = floatV(x);
}
func (t *floatType) value(v float64) FloatValue {
switch Type(t) {
case Float32Type:
res := float32V(v);
return &res;
case Float64Type:
res := float64V(v);
return &res;
case FloatType:
res := floatV(v);
return &res;
}
panic("unknown float type ", t.String());
}
/*
* Ideal float
*/
type idealFloatV struct {
V *bignum.Rational;
}
func (*idealFloatV) Type() Type {
return IdealFloatType;
}
func (v *idealFloatV) String() string {
return ratToString(v.V);
}
func (v *idealFloatV) Get() *bignum.Rational {
return v.V;
}
func (t *idealFloatType) value(v *bignum.Rational) IdealFloatValue {
return &idealFloatV{v};
}
/*
* String
*/
type stringV string
func (*stringV) Type() Type {
return StringType;
}
func (v *stringV) String() string {
return fmt.Sprint(*v);
}
func (v *stringV) Get() string {
return string(*v);
}
func (v *stringV) Set(x string) {
*v = stringV(x);
}
func (t *stringType) value(v string) StringValue {
res := stringV(v);
return &res;
}
/*
* Array
*/
type arrayV []Value
func (*arrayV) Type() Type {
panic("Not implemented");
}
func (v *arrayV) String() string {
return fmt.Sprint(*v);
}
func (v *arrayV) Get() ArrayValue {
return v;
}
func (v *arrayV) Elem(i int64) Value {
return (*v)[i];
}
func (t *ArrayType) value(v []Value) ArrayValue {
res := arrayV(v);
return &res;
}
/*
* Pointer
*/
type ptrV struct {
// nil if the pointer is nil
target Value;
}
func (v *ptrV) Type() Type {
return NewPtrType(v.target.Type());
}
func (v *ptrV) String() string {
return "&" + v.target.String();
}
func (v *ptrV) Get() Value {
return v.target;
}
func (v *ptrV) Set(x Value) {
v.target = x;
}
func (t *PtrType) value(v Value) PtrValue {
res := ptrV{v};
return &res;
}
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