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mirror of https://github.com/golang/go synced 2024-11-22 17:24:53 -07:00

- added initial formatting: indentation

- more AST nodes built and printed

R=r
OCL=15735
CL=15735
This commit is contained in:
Robert Griesemer 2008-09-23 18:34:17 -07:00
parent 09bed25621
commit 83267dce11
3 changed files with 165 additions and 63 deletions

View File

@ -13,7 +13,11 @@ export type Visitor interface {
DoNil(x *Nil);
DoIdent(x *Ident);
// Types
DoFunctionType(x *FunctionType);
// Declarations
//DoVarDeclList(x *VarDeclList);
DoFuncDecl(x *FuncDecl);
// Expressions
@ -29,8 +33,8 @@ export type Visitor interface {
DoBlock(x *Block);
DoExprStat(x *ExprStat);
DoAssignment(x *Assignment);
DoIf(x *If);
DoFor(x *For);
DoIfStat(x *IfStat);
DoForStat(x *ForStat);
DoSwitch(x *Switch);
DoReturn(x *Return);
@ -110,6 +114,24 @@ func (x *Nil) Visit(v Visitor) { v.DoNil(x); }
func (x *Ident) Visit(v Visitor) { v.DoIdent(x); }
// ----------------------------------------------------------------------------
// Types
export type Type interface {
Visit(x Visitor);
}
export type FunctionType struct {
recv *VarDeclList;
params *List;
result *List;
}
func (x *FunctionType) Visit(v Visitor) { v.DoFunctionType(x); }
// ----------------------------------------------------------------------------
// Declarations
@ -118,14 +140,22 @@ export type Decl interface {
}
export type VarDeclList struct {
idents *List;
typ *Node;
}
export type FuncDecl struct {
pos int;
ident *Ident;
typ *FunctionType;
body *Block;
}
func (x *FuncDecl) Visit(v Visitor) { v.DoFuncDecl(x); }
func (x *VarDeclList) Visit(v Visitor) { /*v.DoVarDeclList(x);*/ }
func (x *FuncDecl) Visit(v Visitor) { v.DoFuncDecl(x); }
// ----------------------------------------------------------------------------
@ -219,14 +249,17 @@ export type Assignment struct {
}
export type If struct {
export type IfStat struct {
pos int;
init Stat;
cond Expr;
then, else_ *Block;
}
export type For struct {
export type ForStat struct {
pos int;
body *Block;
}
@ -243,8 +276,8 @@ export type Return struct {
func (x *Block) Visit(v Visitor) { v.DoBlock(x); }
func (x *ExprStat) Visit(v Visitor) { v.DoExprStat(x); }
func (x *Assignment) Visit(v Visitor) { v.DoAssignment(x); }
func (x *If) Visit(v Visitor) { v.DoIf(x); }
func (x *For) Visit(v Visitor) { v.DoFor(x); }
func (x *IfStat) Visit(v Visitor) { v.DoIfStat(x); }
func (x *ForStat) Visit(v Visitor) { v.DoForStat(x); }
func (x *Switch) Visit(v Visitor) { v.DoSwitch(x); }
func (x *Return) Visit(v Visitor) { v.DoReturn(x); }

View File

@ -137,19 +137,18 @@ func (P *Parser) ParseIdent() *AST.Ident {
}
func (P *Parser) ParseIdentList() int {
func (P *Parser) ParseIdentList() *AST.List {
P.Trace("IdentList");
P.ParseIdent();
n := 1;
list := AST.NewList();
list.Add(P.ParseIdent());
for P.tok == Scanner.COMMA {
P.Next();
P.ParseIdent();
n++;
list.Add(P.ParseIdent());
}
P.Ecart();
return n;
return list;
}
@ -243,43 +242,47 @@ func (P *Parser) ParseChannelType() {
}
func (P *Parser) ParseVarDeclList() int {
func (P *Parser) ParseVarDeclList() *AST.VarDeclList {
P.Trace("VarDeclList");
n := P.ParseIdentList();
res := new(AST.VarDeclList);
res.idents = P.ParseIdentList();
P.ParseVarType();
P.Ecart();
return n;
return res;
}
func (P *Parser) ParseParameterList() int {
// Returns a list of AST.VarDeclList
func (P *Parser) ParseParameterList() *AST.List {
P.Trace("ParameterList");
n := P.ParseVarDeclList();
list := AST.NewList();
list.Add(P.ParseVarDeclList());
for P.tok == Scanner.COMMA {
P.Next();
n += P.ParseVarDeclList();
list.Add(P.ParseVarDeclList());
}
P.Ecart();
return n;
return list;
}
func (P *Parser) ParseParameters() int {
// Returns a list of AST.VarDeclList
func (P *Parser) ParseParameters() *AST.List {
P.Trace("Parameters");
n := 0;
var list *AST.List;
P.Expect(Scanner.LPAREN);
if P.tok != Scanner.RPAREN {
n = P.ParseParameterList();
list = P.ParseParameterList();
}
P.Expect(Scanner.RPAREN);
P.Ecart();
return n;
return list;
}
@ -299,7 +302,7 @@ func (P *Parser) ParseResultList() {
}
func (P *Parser) ParseResult() {
func (P *Parser) ParseResult() *AST.List {
P.Trace("Result");
if P.tok == Scanner.LPAREN {
@ -317,6 +320,7 @@ func (P *Parser) ParseResult() {
}
P.Ecart();
return nil
}
@ -326,19 +330,21 @@ func (P *Parser) ParseResult() {
// (params) type
// (params) (results)
func (P *Parser) ParseFunctionType() {
func (P *Parser) ParseFunctionType() *AST.FunctionType {
P.Trace("FunctionType");
P.OpenScope();
P.level--;
P.ParseParameters();
P.ParseResult();
typ := new(AST.FunctionType);
typ.params = P.ParseParameters();
typ.result = P.ParseResult();
P.level++;
P.CloseScope();
P.Ecart();
return typ;
}
@ -892,25 +898,31 @@ func (P *Parser) ParseControlFlowStat(tok int) {
}
func (P *Parser) ParseIfStat() *AST.If {
func (P *Parser) ParseIfStat() *AST.IfStat {
P.Trace("IfStat");
x := new(AST.If);
x := new(AST.IfStat);
x.pos, x.cond = P.pos, AST.NIL;
var init, cond AST.Node = AST.NIL, AST.NIL;
P.Expect(Scanner.IF);
P.OpenScope();
if P.tok != Scanner.LBRACE {
if P.tok != Scanner.SEMICOLON {
P.ParseSimpleStat();
init = P.ParseSimpleStat();
}
if P.tok == Scanner.SEMICOLON {
P.Next();
if P.tok != Scanner.LBRACE {
x.cond = P.ParseExpression();
cond = P.ParseExpression();
} else {
cond = init;
init = AST.NIL;
}
}
}
x.init, x.cond = init, cond;
x.then = P.ParseBlock();
if P.tok == Scanner.ELSE {
P.Next();
@ -931,9 +943,12 @@ func (P *Parser) ParseIfStat() *AST.If {
}
func (P *Parser) ParseForStat() {
func (P *Parser) ParseForStat() *AST.ForStat {
P.Trace("ForStat");
stat := new(AST.ForStat);
stat.pos = P.pos;
P.Expect(Scanner.FOR);
P.OpenScope();
if P.tok != Scanner.LBRACE {
@ -951,10 +966,11 @@ func (P *Parser) ParseForStat() {
}
}
}
P.ParseBlock();
stat.body = P.ParseBlock();
P.CloseScope();
P.Ecart();
return stat;
}
@ -1113,7 +1129,7 @@ func (P *Parser) TryStatement() (AST.Stat, bool) {
case Scanner.IF:
stat = P.ParseIfStat();
case Scanner.FOR:
P.ParseForStat();
stat = P.ParseForStat();
case Scanner.SWITCH:
P.ParseSwitchStat();
case Scanner.RANGE:
@ -1247,40 +1263,42 @@ func (P *Parser) ParseDecl(exported bool, keyword int) {
func (P *Parser) ParseFuncDecl(exported bool) *AST.FuncDecl {
P.Trace("FuncDecl");
pos := P.pos;
fun := new(AST.FuncDecl);
fun.pos = P.pos;
P.Expect(Scanner.FUNC);
P.OpenScope();
P.level--;
var recv *AST.VarDeclList;
if P.tok == Scanner.LPAREN {
recv_pos := P.pos;
n := P.ParseParameters();
recv := P.ParseParameters().at(0);
/*
if n != 1 {
P.Error(recv_pos, "must have exactly one receiver");
}
*/
}
ident := P.ParseIdent();
P.ParseFunctionType();
fun.ident = P.ParseIdent();
fun.typ = P.ParseFunctionType();
fun.typ.recv = recv;
P.level++;
P.CloseScope();
var body *AST.Block;
if P.tok == Scanner.SEMICOLON {
// forward declaration
P.Next();
} else {
body = P.ParseBlock();
fun.body = P.ParseBlock();
}
P.Ecart();
x := new(AST.FuncDecl);
x.pos, x.ident, x.body = pos, ident, body;
return x;
return fun;
}

View File

@ -13,6 +13,18 @@ type Printer /* implements AST.Visitor */ struct {
}
func (P *Printer) NewLine(delta int) {
P.indent += delta;
if P.indent < 0 {
panic("negative indent");
}
print("\n");
for i := P.indent; i > 0; i-- {
print("\t");
}
}
func (P *Printer) String(s string) {
print(s);
}
@ -23,7 +35,7 @@ func (P *Printer) Print(x AST.Node) {
}
func (P *Printer) PrintExprList(p *AST.List) {
func (P *Printer) PrintList(p *AST.List) {
if p != nil {
for i := 0; i < p.len(); i++ {
if i > 0 {
@ -39,7 +51,8 @@ func (P *Printer) PrintExprList(p *AST.List) {
// Basics
func (P *Printer) DoNil(x *AST.Nil) {
P.String("?\n");
P.String("?");
P.NewLine(0);
}
@ -48,20 +61,48 @@ func (P *Printer) DoIdent(x *AST.Ident) {
}
// ----------------------------------------------------------------------------
// Types
func (P *Printer) DoFunctionType(x *AST.FunctionType) {
/*
if x.recv != nil {
P.DoVarDeclList(x.recv);
}
*/
P.String("(");
P.PrintList(x.params);
P.String(") ");
}
// ----------------------------------------------------------------------------
// Declarations
func (P *Printer) DoBlock(x *AST.Block);
//func (P *Printer) DoVarDeclList(x *VarDeclList) {
//}
func (P *Printer) DoFuncDecl(x *AST.FuncDecl) {
P.String("func ");
if x.typ.recv != nil {
P.String("(");
P.PrintList(x.typ.recv.idents);
P.String(") ");
}
P.DoIdent(x.ident);
P.String("(... something here ...) ");
P.DoFunctionType(x.typ);
if x.body != nil {
P.DoBlock(x.body);
} else {
P.String(";\n");
P.String(";");
}
P.NewLine(0);
P.NewLine(0);
P.NewLine(0);
}
@ -106,7 +147,7 @@ func (P *Printer) DoIndex(x *AST.Index) {
func (P *Printer) DoCall(x *AST.Call) {
P.Print(x.fun);
P.String("(");
P.PrintExprList(x.args);
P.PrintList(x.args);
P.String(")");
}
@ -123,55 +164,65 @@ func (P *Printer) DoSelector(x *AST.Selector) {
func (P *Printer) DoBlock(x *AST.Block) {
if x == nil || x.stats == nil {
P.String("\n");
P.NewLine(0);
return;
}
P.String("{\n");
P.indent++;
P.String("{");
P.NewLine(1);
for i := 0; i < x.stats.len(); i++ {
if i > 0 {
P.NewLine(0);
}
P.Print(x.stats.at(i));
P.String("\n");
}
P.indent--;
P.String("}\n");
P.NewLine(-1);
P.String("}");
}
func (P *Printer) DoExprStat(x *AST.ExprStat) {
P.Print(x.expr);
P.String(";");
}
func (P *Printer) DoAssignment(x *AST.Assignment) {
P.PrintExprList(x.lhs);
P.PrintList(x.lhs);
P.String(" " + Scanner.TokenName(x.tok) + " ");
P.PrintExprList(x.rhs);
P.PrintList(x.rhs);
P.String(";");
}
func (P *Printer) DoIf(x *AST.If) {
func (P *Printer) DoIfStat(x *AST.IfStat) {
P.String("if ");
P.Print(x.init);
P.String("; ");
P.Print(x.cond);
P.DoBlock(x.then);
if x.else_ != nil {
P.String("else ");
P.String(" else ");
P.DoBlock(x.else_);
}
}
func (P *Printer) DoFor(x *AST.For) {
func (P *Printer) DoForStat(x *AST.ForStat) {
P.String("for ");
P.DoBlock(x.body);
}
func (P *Printer) DoSwitch(x *AST.Switch) {
P.String("switch ");
}
func (P *Printer) DoReturn(x *AST.Return) {
P.String("return ");
P.PrintExprList(x.res);
P.PrintList(x.res);
P.String(";");
}
@ -181,7 +232,7 @@ func (P *Printer) DoReturn(x *AST.Return) {
func (P *Printer) DoProgram(x *AST.Program) {
P.String("package ");
P.DoIdent(x.ident);
P.String("\n");
P.NewLine(0);
for i := 0; i < x.decls.len(); i++ {
P.Print(x.decls.at(i));
}