mirror of
https://github.com/golang/go
synced 2024-11-22 23:50:03 -07:00
483 lines
9.1 KiB
Go
483 lines
9.1 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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// ----------------------------------------------------------------------------
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// Visitor
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export type Visitor interface {
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// Basics
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DoNil(x *Nil);
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DoIdent(x *Ident);
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// Types
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DoFunctionType(x *FunctionType);
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DoArrayType(x *ArrayType);
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DoStructType(x *StructType);
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DoMapType(x *MapType);
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DoChannelType(x *ChannelType);
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DoInterfaceType(x *InterfaceType);
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DoPointerType(x *PointerType);
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// Declarations
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DoImportDecl(x *ImportDecl);
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DoConstDecl(x *ConstDecl);
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DoTypeDecl(x *TypeDecl);
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DoVarDecl(x *VarDecl);
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DoVarDeclList(x *VarDeclList);
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DoFuncDecl(x *FuncDecl);
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DoMethodDecl(x *MethodDecl);
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DoDeclaration(x *Declaration);
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// Expressions
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DoBinary(x *Binary);
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DoUnary(x *Unary);
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DoLiteral(x *Literal);
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DoPair(x *Pair);
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DoIndex(x *Index);
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DoCall(x *Call);
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DoSelector(x *Selector);
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DoCompositeLit(x *CompositeLit);
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DoFunctionLit(x *FunctionLit);
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// Statements
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DoLabel(x *Label);
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DoBlock(x *Block);
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DoExprStat(x *ExprStat);
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DoAssignment(x *Assignment);
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DoIfStat(x *IfStat);
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DoForStat(x *ForStat);
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DoCaseClause(x *CaseClause);
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DoSwitchStat(x *SwitchStat);
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DoReturnStat(x *ReturnStat);
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DoIncDecStat(x *IncDecStat);
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DoControlFlowStat(x *ControlFlowStat);
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DoGoStat(x *GoStat);
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// Program
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DoProgram(x *Program);
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}
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// ----------------------------------------------------------------------------
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// An AST Node
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export type Node interface {
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Visit(x Visitor);
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}
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// ----------------------------------------------------------------------------
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// Lists
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//
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// If p is a list and p == nil, then p.len() == 0.
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// Thus, empty lists can be represented by nil.
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export type List struct {
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a *[] Node;
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}
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func (p *List) len() int {
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if p == nil { return 0; }
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return len(p.a);
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}
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func (p *List) at(i int) Node {
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return p.a[i];
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}
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func (p *List) Add (x Node) {
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a := p.a;
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n := len(a);
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if n == cap(a) {
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b := new([] Node, 2*n);
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for i := 0; i < n; i++ {
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b[i] = a[i];
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}
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a = b;
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}
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a = a[0 : n + 1];
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a[n] = x;
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p.a = a;
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}
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export func NewList() *List {
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p := new(List);
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p.a = new([] Node, 10) [0 : 0];
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return p;
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}
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// ----------------------------------------------------------------------------
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// Basics
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export type Nil struct {
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// The Node "nil" value
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}
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export var NIL *Nil = new(Nil);
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export type Ident struct {
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pos int;
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val string;
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}
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func (x *Nil) Visit(v Visitor) { v.DoNil(x); }
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func (x *Ident) Visit(v Visitor) { v.DoIdent(x); }
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// ----------------------------------------------------------------------------
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// Types
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export type Type interface {
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Visit(x Visitor);
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}
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export type Expr interface {
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Visit(x Visitor);
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}
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export type ArrayType struct {
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pos int; // position of "["
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len_ Expr;
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elt Type;
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}
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export type StructType struct {
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pos int; // position of "struct"
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fields *List; // list of *VarDeclList
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}
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export type MapType struct {
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pos int; // position of "map"
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key, val Type;
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}
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export const /* chan mode */ (
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FULL = iota;
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RECV;
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SEND;
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)
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export type ChannelType struct {
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pos int; // position of "chan" or "<-" (if before "chan")
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elt Type;
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mode int;
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}
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export type PointerType struct {
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pos int; // position of "*"
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base Type;
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}
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export type InterfaceType struct {
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pos int; // position of "interface"
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methods *List; // list of *MethodDecl
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}
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export type FunctionType struct {
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pos int; // position of "("
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recv *VarDeclList;
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params *List; // list of *VarDeclList
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result *List; // list of *VarDeclList
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}
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func (x *FunctionType) Visit(v Visitor) { v.DoFunctionType(x); }
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func (x *ArrayType) Visit(v Visitor) { v.DoArrayType(x); }
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func (x *StructType) Visit(v Visitor) { v.DoStructType(x); }
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func (x *MapType) Visit(v Visitor) { v.DoMapType(x); }
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func (x *ChannelType) Visit(v Visitor) { v.DoChannelType(x); }
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func (x *PointerType) Visit(v Visitor) { v.DoPointerType(x); }
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func (x *InterfaceType) Visit(v Visitor) { v.DoInterfaceType(x); }
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// ----------------------------------------------------------------------------
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// Declarations
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export type Decl interface {
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Visit(x Visitor);
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}
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export type VarDeclList struct {
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idents *List; // possibly nil
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typ Type;
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}
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export type ImportDecl struct {
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ident *Ident;
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file string;
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}
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export type ConstDecl struct {
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ident *Ident;
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typ Type;
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val Expr;
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}
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export type TypeDecl struct {
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ident *Ident;
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typ Type;
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}
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export type VarDecl struct {
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idents *List;
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typ Type;
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vals *List;
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}
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export type Declaration struct {
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pos int; // position of token
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tok int;
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decls *List;
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}
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export type FuncDecl struct {
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pos int; // position of "func"
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ident *Ident;
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typ *FunctionType;
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body *Block;
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}
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export type MethodDecl struct {
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ident *Ident;
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typ *FunctionType;
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}
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func (x *VarDeclList) Visit(v Visitor) { v.DoVarDeclList(x); }
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func (x *ImportDecl) Visit(v Visitor) { v.DoImportDecl(x); }
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func (x *ConstDecl) Visit(v Visitor) { v.DoConstDecl(x); }
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func (x *TypeDecl) Visit(v Visitor) { v.DoTypeDecl(x); }
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func (x *VarDecl) Visit(v Visitor) { v.DoVarDecl(x); }
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func (x *FuncDecl) Visit(v Visitor) { v.DoFuncDecl(x); }
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func (x *MethodDecl) Visit(v Visitor) { v.DoMethodDecl(x); }
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func (x *Declaration) Visit(v Visitor) { v.DoDeclaration(x); }
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// ----------------------------------------------------------------------------
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// Expressions
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export type Selector struct {
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pos int; // position of "."
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x Expr;
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field string;
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}
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export type Index struct {
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pos int; // position of "["
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x Expr;
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index Expr;
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}
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export type Call struct {
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pos int; // position of "("
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fun Expr;
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args *List;
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}
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export type Pair struct {
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pos int; // position of ":"
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x, y Expr;
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}
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export type Binary struct {
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pos int; // position of operator tok
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tok int;
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x, y Expr;
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}
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export type Unary struct {
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pos int; // position of operator tok
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tok int;
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x Expr;
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}
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export type Literal struct {
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pos int; // position of literal
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tok int;
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val string;
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}
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export type CompositeLit struct {
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pos int; // position of "{"
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typ Type;
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vals *List // list of Expr
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}
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export type FunctionLit struct {
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pos int; // position of "func"
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typ *FunctionType;
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body *Block;
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}
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func (x *Binary) Visit(v Visitor) { v.DoBinary(x); }
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func (x *Unary) Visit(v Visitor) { v.DoUnary(x); }
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func (x *Literal) Visit(v Visitor) { v.DoLiteral(x); }
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func (x *Pair) Visit(v Visitor) { v.DoPair(x); }
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func (x *Index) Visit(v Visitor) { v.DoIndex(x); }
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func (x *Call) Visit(v Visitor) { v.DoCall(x); }
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func (x *Selector) Visit(v Visitor) { v.DoSelector(x); }
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func (x *CompositeLit) Visit(v Visitor) { v.DoCompositeLit(x); }
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func (x *FunctionLit) Visit(v Visitor) { v.DoFunctionLit(x); }
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// ----------------------------------------------------------------------------
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// Statements
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export type Stat interface {
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Visit(x Visitor);
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}
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export type Label struct {
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pos int; // position of ":"
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ident Expr; // should be ident
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}
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export type Block struct {
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pos int; // position of "{"
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stats *List;
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}
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export type ExprStat struct {
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expr Expr;
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}
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export type Assignment struct {
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pos int; // position of assignment token
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tok int;
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lhs, rhs *List;
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}
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export type ControlClause struct {
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init Stat;
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expr Expr;
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post Stat;
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has_init, has_expr, has_post bool;
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}
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export type IfStat struct {
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pos int; // position of "if"
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ctrl *ControlClause;
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then *Block;
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else_ Stat;
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has_else bool;
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}
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export type ForStat struct {
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pos int; // position of "for"
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ctrl *ControlClause;
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body *Block;
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}
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export type CaseClause struct {
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pos int; // position of "case" or "default"
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exprs *List; // nil if default case
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stats *List; // list of Stat
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falls bool;
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}
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export type SwitchStat struct {
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pos int; // position of "switch"
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ctrl *ControlClause;
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cases *List; // list of *CaseClause
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}
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export type ReturnStat struct {
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pos int; // position of "return"
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res *List; // list of Expr
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}
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export type IncDecStat struct {
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pos int; // position of token
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tok int;
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expr Expr;
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}
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export type ControlFlowStat struct {
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pos int; // position of token
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tok int;
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label *Ident; // nil, if no label
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}
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export type GoStat struct {
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pos int; // position of "go"
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expr Expr;
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}
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func (x *Block) Visit(v Visitor) { v.DoBlock(x); }
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func (x *Label) Visit(v Visitor) { v.DoLabel(x); }
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func (x *ExprStat) Visit(v Visitor) { v.DoExprStat(x); }
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func (x *Assignment) Visit(v Visitor) { v.DoAssignment(x); }
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func (x *IfStat) Visit(v Visitor) { v.DoIfStat(x); }
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func (x *ForStat) Visit(v Visitor) { v.DoForStat(x); }
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func (x *CaseClause) Visit(v Visitor) { v.DoCaseClause(x); }
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func (x *SwitchStat) Visit(v Visitor) { v.DoSwitchStat(x); }
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func (x *ReturnStat) Visit(v Visitor) { v.DoReturnStat(x); }
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func (x *IncDecStat) Visit(v Visitor) { v.DoIncDecStat(x); }
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func (x *ControlFlowStat) Visit(v Visitor) { v.DoControlFlowStat(x); }
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func (x *GoStat) Visit(v Visitor) { v.DoGoStat(x); }
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// ----------------------------------------------------------------------------
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// Program
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export type Program struct {
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pos int;
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ident *Ident;
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decls *List;
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}
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func (x *Program) Visit(v Visitor) { v.DoProgram(x); }
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