mirror of
https://github.com/golang/go
synced 2024-11-13 19:10:22 -07:00
140 lines
2.3 KiB
Go
140 lines
2.3 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package AST
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import Globals "globals"
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import Universe "universe"
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// ----------------------------------------------------------------------------
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// Expressions
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export type Literal struct {
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pos_ int;
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typ_ *Globals.Type;
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b bool;
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i int;
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f float;
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s string;
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}
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func (x *Literal) pos() int {
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return x.pos_;
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}
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func (x *Literal) typ() *Globals.Type {
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return x.typ_;
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}
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export func NewLiteral(pos int, typ *Globals.Type) *Literal {
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x := new(Literal);
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x.pos_ = pos;
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x.typ_ = typ;
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return x;
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}
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export var Bad, True, False, Nil *Literal;
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// NOTE We could use Globals.Object directly if we'd added a typ()
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// method to its interface. However, this would require renaming the
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// typ field everywhere... - Need to think about accessors again.
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export type Object struct {
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pos_ int;
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obj *Globals.Object;
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}
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func (x *Object) pos() int {
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return x.pos_;
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}
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func (x *Object) typ() *Globals.Type {
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return x.obj.typ;
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}
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export func NewObject(pos int, obj* Globals.Object) *Object {
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x := new(Object);
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x.pos_ = pos;
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x.obj = obj;
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return x;
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}
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// TODO model Selector as binary operation?
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export type Selector struct {
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pos_ int;
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typ_ *Globals.Type;
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}
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func (x *Selector) pos() int {
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return x.pos_;
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}
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func (x *Selector) typ() *Globals.Type {
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return x.typ_;
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}
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export func NewSelector(pos int, typ *Globals.Type) *Selector {
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x := new(Selector);
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x.pos_ = pos;
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x.typ_ = typ;
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return x;
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}
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export type BinaryExpr struct {
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pos_ int;
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typ_ *Globals.Type;
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op int;
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x, y Globals.Expr;
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}
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func (x *BinaryExpr) pos() int {
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return x.pos_;
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}
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func (x *BinaryExpr) typ() *Globals.Type {
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return x.typ_;
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}
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// ----------------------------------------------------------------------------
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// Statements
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export type Block struct {
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// TODO fill in
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}
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export type IfStat struct {
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cond Globals.Expr;
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then_ Globals.Stat;
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else_ Globals.Stat;
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}
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// ----------------------------------------------------------------------------
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// Initialization
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func init() {
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Bad = NewLiteral(-1, Universe.bad_t);
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True = NewLiteral(-1, Universe.bool_t); True.b = true;
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False = NewLiteral(-1, Universe.bool_t); False.b = false;
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Nil = NewLiteral(-1, Universe.nil_t);
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}
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