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https://github.com/golang/go
synced 2024-11-22 14:04:48 -07:00
Some AST tuning:
- have explicit XSpec nodes for declarations - have a general GenDecl node instead of DeclList R=rsc DELTA=164 (52 added, 52 deleted, 60 changed) OCL=27005 CL=27027
This commit is contained in:
Robert Griesemer
parent
c4ad4f9fcf
commit
3ba69bf08b
@ -654,6 +654,38 @@ func (s *RangeStmt) Visit(v StmtVisitor) { v.DoRangeStmt(s); }
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// ----------------------------------------------------------------------------
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// Declarations
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// A Spec node represents a single (non-parenthesized) import,
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// constant, type, or variable declaration.
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//
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type (
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// The Spec type stands for any of *ImportSpec, *ValueSpec, and *TypeSpec.
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Spec interface {};
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// An ImportSpec node represents a single package import.
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ImportSpec struct {
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Doc Comments; // associated documentation; or nil
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Name *Ident; // local package name (including "."); or nil
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Path []*StringLit; // package path
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};
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// A ValueSpec node represents a constant or variable declaration
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// (ConstSpec or VarSpec production).
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ValueSpec struct {
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Doc Comments; // associated documentation; or nil
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Names []*Ident;
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Type Expr; // value type; or nil
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Values []Expr;
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};
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// A TypeSpec node represents a type declaration (TypeSpec production).
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TypeSpec struct {
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Doc Comments; // associated documentation; or nil
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Name *Ident; // type name
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Type Expr;
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};
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)
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// A declaration is represented by one of the following declaration nodes.
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//
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type (
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@ -665,51 +697,33 @@ type (
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token.Position; // beginning position of bad declaration
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};
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ImportDecl struct {
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Doc Comments; // associated documentation; or nil
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token.Position; // position of "import" keyword
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Name *Ident; // local package name or nil
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Path []*StringLit; // package path
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};
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ConstDecl struct {
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Doc Comments; // associated documentation; or nil
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token.Position; // position of "const" keyword
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Names []*Ident;
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Type Expr; // constant type or nil
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Values []Expr;
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};
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TypeDecl struct {
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Doc Comments; // associated documentation; or nil
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token.Position; // position of "type" keyword
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Name *Ident;
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Type Expr;
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};
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VarDecl struct {
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Doc Comments; // associated documentation; or nil
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token.Position; // position of "var" keyword
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Names []*Ident;
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Type Expr; // variable type or nil
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Values []Expr;
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};
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FuncDecl struct {
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Doc Comments; // associated documentation; or nil
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Recv *Field; // receiver (methods) or nil (functions)
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Name *Ident; // function/method name
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Type *FuncType; // position of Func keyword, parameters and results
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Body *BlockStmt; // function body or nil (forward declaration)
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};
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DeclList struct {
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// A GenDecl node (generic declaration node) represents an import,
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// constant, type or variable declaration. A valid Lparen position
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// (Lparen.Line > 0) indicates a parenthesized declaration.
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//
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// Relationship between Tok value and Specs element type:
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//
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// token.IMPORT *ImportSpec
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// token.CONST *ValueSpec
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// token.TYPE *TypeSpec
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// token.VAR *ValueSpec
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//
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GenDecl struct {
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Doc Comments; // associated documentation; or nil
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token.Position; // position of Tok
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Tok token.Token; // IMPORT, CONST, VAR, TYPE
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Lparen token.Position; // position of '('
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List []Decl; // the list of parenthesized declarations
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Rparen token.Position; // position of ')'
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Tok token.Token; // IMPORT, CONST, TYPE, VAR
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Lparen token.Position; // position of '(', if any
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Specs []Spec;
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Rparen token.Position; // position of ')', if any
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};
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// A FuncDecl node represents a function declaration.
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FuncDecl struct {
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Doc Comments; // associated documentation; or nil
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Recv *Field; // receiver (methods); or nil (functions)
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Name *Ident; // function/method name
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Type *FuncType; // position of Func keyword, parameters and results
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Body *BlockStmt; // function body; or nil (forward declaration)
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};
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)
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@ -725,24 +739,16 @@ func (d *FuncDecl) Pos() token.Position { return d.Type.Pos(); }
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//
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type DeclVisitor interface {
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DoBadDecl(d *BadDecl);
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DoImportDecl(d *ImportDecl);
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DoConstDecl(d *ConstDecl);
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DoTypeDecl(d *TypeDecl);
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DoVarDecl(d *VarDecl);
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DoGenDecl(d *GenDecl);
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DoFuncDecl(d *FuncDecl);
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DoDeclList(d *DeclList);
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}
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// Visit() implementations for all declaration nodes.
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//
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func (d *BadDecl) Visit(v DeclVisitor) { v.DoBadDecl(d); }
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func (d *ImportDecl) Visit(v DeclVisitor) { v.DoImportDecl(d); }
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func (d *ConstDecl) Visit(v DeclVisitor) { v.DoConstDecl(d); }
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func (d *TypeDecl) Visit(v DeclVisitor) { v.DoTypeDecl(d); }
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func (d *VarDecl) Visit(v DeclVisitor) { v.DoVarDecl(d); }
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func (d *GenDecl) Visit(v DeclVisitor) { v.DoGenDecl(d); }
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func (d *FuncDecl) Visit(v DeclVisitor) { v.DoFuncDecl(d); }
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func (d *DeclList) Visit(v DeclVisitor) { v.DoDeclList(d); }
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// ----------------------------------------------------------------------------
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@ -1645,14 +1645,16 @@ func (p *parser) parseStatement() ast.Stmt {
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// ----------------------------------------------------------------------------
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// Declarations
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func (p *parser) parseImportSpec(pos token.Position, doc ast.Comments) *ast.ImportDecl {
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type parseSpecFunction func(p *parser, doc ast.Comments) ast.Spec
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func parseImportSpec(p *parser, doc ast.Comments) ast.Spec {
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if p.trace {
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defer un(trace(p, "ImportSpec"));
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}
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var ident *ast.Ident;
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if p.tok == token.PERIOD {
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p.error(p.pos, `"import ." not yet handled properly`);
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ident = &ast.Ident{p.pos, []byte{'.'}};
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p.next();
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} else if p.tok == token.IDENT {
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ident = p.parseIdent();
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@ -1665,11 +1667,11 @@ func (p *parser) parseImportSpec(pos token.Position, doc ast.Comments) *ast.Impo
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p.expect(token.STRING); // use expect() error handling
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}
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return &ast.ImportDecl{doc, pos, ident, path};
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return &ast.ImportSpec{doc, ident, path};
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}
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func (p *parser) parseConstSpec(pos token.Position, doc ast.Comments) *ast.ConstDecl {
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func parseConstSpec(p *parser, doc ast.Comments) ast.Spec {
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if p.trace {
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defer un(trace(p, "ConstSpec"));
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}
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@ -1682,11 +1684,11 @@ func (p *parser) parseConstSpec(pos token.Position, doc ast.Comments) *ast.Const
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values = p.parseExpressionList();
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}
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return &ast.ConstDecl{doc, pos, idents, typ, values};
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return &ast.ValueSpec{doc, idents, typ, values};
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}
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func (p *parser) parseTypeSpec(pos token.Position, doc ast.Comments) *ast.TypeDecl {
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func parseTypeSpec(p *parser, doc ast.Comments) ast.Spec {
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if p.trace {
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defer un(trace(p, "TypeSpec"));
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}
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@ -1694,11 +1696,11 @@ func (p *parser) parseTypeSpec(pos token.Position, doc ast.Comments) *ast.TypeDe
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ident := p.parseIdent();
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typ := p.parseType();
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return &ast.TypeDecl{doc, pos, ident, typ};
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return &ast.TypeSpec{doc, ident, typ};
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}
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func (p *parser) parseVarSpec(pos token.Position, doc ast.Comments) *ast.VarDecl {
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func parseVarSpec(p *parser, doc ast.Comments) ast.Spec {
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if p.trace {
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defer un(trace(p, "VarSpec"));
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}
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@ -1711,55 +1713,43 @@ func (p *parser) parseVarSpec(pos token.Position, doc ast.Comments) *ast.VarDecl
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values = p.parseExpressionList();
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}
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return &ast.VarDecl{doc, pos, idents, typ, values};
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return &ast.ValueSpec{doc, idents, typ, values};
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}
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func (p *parser) parseSpec(pos token.Position, doc ast.Comments, keyword int) ast.Decl {
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switch keyword {
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case token.IMPORT: return p.parseImportSpec(pos, doc);
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case token.CONST: return p.parseConstSpec(pos, doc);
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case token.TYPE: return p.parseTypeSpec(pos, doc);
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case token.VAR: return p.parseVarSpec(pos, doc);
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}
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panic(); // unreachable
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return nil;
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}
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func (p *parser) parseDecl(keyword int) ast.Decl {
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func (p *parser) parseGenDecl(keyword token.Token, f parseSpecFunction) *ast.GenDecl {
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if p.trace {
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defer un(trace(p, "Decl"));
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defer un(trace(p, keyword.String() + "Decl"));
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}
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doc := p.getDoc();
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pos := p.expect(keyword);
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var lparen, rparen token.Position;
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list := vector.New(0);
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if p.tok == token.LPAREN {
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lparen := p.pos;
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lparen = p.pos;
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p.next();
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list := vector.New(0);
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for p.tok != token.RPAREN && p.tok != token.EOF {
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list.Push(p.parseSpec(noPos, nil, keyword));
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doc := p.getDoc();
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list.Push(f(p, doc));
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if p.tok == token.SEMICOLON {
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p.next();
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} else {
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break;
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}
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}
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rparen := p.expect(token.RPAREN);
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rparen = p.expect(token.RPAREN);
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p.opt_semi = true;
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// convert vector
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decls := make([]ast.Decl, list.Len());
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for i := 0; i < list.Len(); i++ {
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decls[i] = list.At(i).(ast.Decl);
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}
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return &ast.DeclList{doc, pos, keyword, lparen, decls, rparen};
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} else {
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list.Push(f(p, doc));
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}
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return p.parseSpec(pos, doc, keyword);
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// convert vector
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specs := make([]ast.Spec, list.Len());
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for i := 0; i < list.Len(); i++ {
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specs[i] = list.At(i);
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}
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return &ast.GenDecl{doc, pos, keyword, lparen, specs, rparen};
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}
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@ -1820,17 +1810,21 @@ func (p *parser) parseDeclaration() ast.Decl {
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defer un(trace(p, "Declaration"));
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}
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var f parseSpecFunction;
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switch p.tok {
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case token.CONST, token.TYPE, token.VAR:
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return p.parseDecl(p.tok);
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case token.CONST: f = parseConstSpec;
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case token.TYPE: f = parseTypeSpec;
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case token.VAR: f = parseVarSpec;
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case token.FUNC:
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return p.parseFunctionDecl();
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default:
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pos := p.pos;
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p.error_expected(pos, "declaration");
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p.next(); // make progress
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return &ast.BadDecl{pos};
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}
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pos := p.pos;
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p.error_expected(pos, "declaration");
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p.next(); // make progress
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return &ast.BadDecl{pos};
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return p.parseGenDecl(p.tok, f);
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}
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@ -1869,7 +1863,7 @@ func (p *parser) parsePackage() *ast.Program {
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// import decls
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list := vector.New(0);
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for p.tok == token.IMPORT {
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list.Push(p.parseDecl(token.IMPORT));
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list.Push(p.parseGenDecl(token.IMPORT, parseImportSpec));
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if p.tok == token.SEMICOLON {
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p.next();
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}
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