- more front-end stuff: hooking up packages, preparing for exports

SVN=127931

usr/gri/gosrc/compilation.go

@@ -15,7 +15,7 @@ import Export "export"
 
 func BaseName(s string) string {
 	// TODO this is not correct for non-ASCII strings!
-	i := len(s);
+	i := len(s) - 1;
 	for i >= 0 && s[i] != '/' {
 		if s[i] > 128 {
 			panic "non-ASCII string"
@@ -31,43 +31,40 @@ func FixExt(s string) string {
 	if s[i : len(s)] == ".go" {
 		s = s[0 : i];
 	}
-	return s + ".7"
-}
-
-
-func Import(C *Globals.Compilation, pkg_name string) (pno int) {
-	panic "UNIMPLEMENTED";
-}
-
-
-func Export(C *Globals.Compilation) {
-	file_name := FixExt(BaseName(C.src_name));  // strip src dir
-	Export.Export(file_name/*, C */);
+	return s + ".7";
 }
 
 
 export Compile
-func Compile(src_name string, verbose int) {
-	comp := new(Globals.Compilation);
-	comp.src_name = src_name;
-	comp.pkg = nil;
-	comp.nimports = 0;
-	
-	src, ok := sys.readfile(src_name);
+func Compile(file_name string, verbose int) {
+	src, ok := sys.readfile(file_name);
 	if !ok {
-		print "cannot open ", src_name, "\n"
+		print "cannot open ", file_name, "\n"
 		return;
 	}
 	
-	Universe.Init();
+	Universe.Init();  // TODO eventually this should be only needed once
+	
+	comp := Globals.NewCompilation();
+	pkg := Globals.NewPackage(file_name);
+	comp.Insert(pkg);
+	if comp.npkgs != 1 {
+		panic "should have exactly one package now";
+	}
 
-	S := new(Scanner.Scanner);
-	S.Open(src_name, src);
+	scanner := new(Scanner.Scanner);
+	scanner.Open(file_name, src);
 
-	P := new(Parser.Parser);
-	P.Open(S, verbose);
+	parser := new(Parser.Parser);
+	parser.Open(comp, scanner, verbose);
+
+	print "parsing ", file_name, "\n";
+	parser.ParseProgram();
+	if parser.S.nerrors > 0 {
+		return;
+	}
 	
-	print "parsing ", src_name, "\n";
-	P.ParseProgram();
-	//comp.Export();
+	// export
+	export_file_name := FixExt(BaseName(file_name));  // strip file dir
+	Export.Export(comp, export_file_name);
 }

usr/gri/gosrc/export.go

@@ -252,7 +252,7 @@ func (E *Exporter) WritePackage(pkg *Globals.Package) {
 	pkg.ref = E.pkg_ref;
 	E.pkg_ref++;
 
-	E.WriteString(pkg.ident);
+	E.WriteString(pkg.obj.ident);
 	E.WriteString(pkg.file_name);
 	E.WriteString(pkg.key);
 }
@@ -294,7 +294,7 @@ func (E *Exporter) Export(/*Compilation* comp, BBuffer* buf*/) {
 
 
 export Export
-func Export(file_name string /*comp *Compilation.Compilation*/) {
+func Export(comp *Globals.Compilation, file_name string) {
 	/*
 	Exporter exp;
 	exp.Export(comp, buf);

usr/gri/gosrc/globals.go

@@ -34,7 +34,17 @@ type Type struct {
 	obj *Object;  // primary type object or NULL
 	key *Object;  // maps
 	elt *Object;  // arrays, maps, channels, pointers, references
-	scope *Scope;  // incomplete types, structs, interfaces, functions, packages
+	scope *Scope;  // structs, interfaces, functions
+}
+
+
+export Package
+type Package struct {
+	ref int;  // for exporting only: >= 0 means already exported
+	file_name string;
+	key string;
+	obj *Object;
+	scope *Scope;
 }
 
 
@@ -46,6 +56,7 @@ type Elem struct {
 	str string;
 	obj *Object;
 	typ *Type;
+	pkg *Package;
 }
 
 
@@ -64,23 +75,11 @@ type Scope struct {
 }
 
 
-export Package
-type Package struct {
-	ref int;  // for exporting only: >= 0 means already exported
-	file_name string;
-	ident string;
-	key string;
-	scope *Scope;
-	pno int;
-}
-
-
 export Compilation
 type Compilation struct {
-  src_name string;
-  pkg *Object;
-  imports [256] *Package;  // TODO need open arrays
-  nimports int;
+	// TODO use open arrays eventually
+	pkgs [256] *Package;  // pkgs[0] is the current package
+	npkgs int;
 }
 
 
@@ -103,11 +102,21 @@ func NewObject(pos, kind int, ident string) *Object {
 export NewType
 func NewType(form int) *Type {
 	typ := new(Type);
+	typ.ref = -1;
 	typ.form = form;
 	return typ;
 }
 
 
+export NewPackage;
+func NewPackage(file_name string) *Package {
+	pkg := new(Package);
+	pkg.ref = -1;
+	pkg.file_name = file_name;
+	return pkg;
+}
+
+
 export NewList
 func NewList() *List {
 	return new(List);
@@ -123,10 +132,10 @@ func NewScope(parent *Scope) *Scope {
 }
 
 
-export NewPackage;
-func NewPackage() *Package {
-	pkg := new(Package);
-	return pkg;
+export NewCompilation;
+func NewCompilation() *Compilation {
+	comp := new(Compilation);
+	return comp;
 }
 
 
@@ -241,8 +250,8 @@ func (scope *Scope) Print() {
 // Compilation methods
 
 func (C *Compilation) Lookup(file_name string) *Package {
-	for i := 0; i < C.nimports; i++ {
-		pkg := C.imports[i];
+	for i := 0; i < C.npkgs; i++ {
+		pkg := C.pkgs[i];
 		if pkg.file_name == file_name {
 			return pkg;
 		}
@@ -255,9 +264,8 @@ func (C *Compilation) Insert(pkg *Package) {
 	if C.Lookup(pkg.file_name) != nil {
 		panic "package already inserted";
 	}
-	pkg.pno = C.nimports;
-	C.imports[C.nimports] = pkg;
-	C.nimports++;
+	C.pkgs[C.npkgs] = pkg;
+	C.npkgs++;
 }
 
 

usr/gri/gosrc/parser.go

@@ -17,12 +17,14 @@ const EnableSemanticTests = false;
 
 export Parser
 type Parser struct {
+	comp *Globals.Compilation;
 	verbose, indent int;
 	S *Scanner.Scanner;
 	tok int;  // one token look-ahead
 	beg, end int;  // token position
 	ident string;  // last ident seen
 	top_scope *Globals.Scope;
+	exports *Globals.List;
 }
 
 
@@ -66,12 +68,14 @@ func (P *Parser) Next() {
 }
 
 
-func (P *Parser) Open(S *Scanner.Scanner, verbose int) {
+func (P *Parser) Open(comp *Globals.Compilation, S *Scanner.Scanner, verbose int) {
+	P.comp = comp;
 	P.verbose = verbose;
 	P.indent = 0;
 	P.S = S;
 	P.Next();
 	P.top_scope = Universe.scope;
+	P.exports = Globals.NewList();
 }
 
 
@@ -1238,15 +1242,15 @@ func (P *Parser) ParseExportDecl() {
 	if P.tok == Scanner.LPAREN {
 		P.Next();
 		for P.tok != Scanner.RPAREN {
-			P.ParseIdent();
+			P.exports.AddStr(P.ParseIdent());
 			P.Optional(Scanner.COMMA);  // TODO this seems wrong
 		}
 		P.Next();
 	} else {
-		P.ParseIdent();
+		P.exports.AddStr(P.ParseIdent());
 		for P.tok == Scanner.COMMA {
 			P.Next();
-			P.ParseIdent();
+			P.exports.AddStr(P.ParseIdent());
 		}
 	}
 	
@@ -1284,14 +1288,46 @@ func (P *Parser) ParseDeclaration() {
 // ----------------------------------------------------------------------------
 // Program
 
+func (P *Parser) MarkExports() {
+	if !EnableSemanticTests {
+		return;
+	}
+	
+	scope := P.top_scope;
+	for p := P.exports.first; p != nil; p = p.next {
+		obj := scope.Lookup(p.str);
+		if obj != nil {
+			obj.mark = true;
+			// For now we export deep
+			// TODO this should change eventually - we need selective export
+			if obj.kind == Object.TYPE {
+				typ := obj.typ;
+				if typ.form == Type.STRUCT || typ.form == Type.INTERFACE {
+					scope := typ.scope;
+					for p := scope.entries.first; p != nil; p = p.next {
+						p.obj.mark = true;
+					}
+				}
+			}
+		} else {
+			// TODO need to report proper src position
+			P.Error(0, `"` + p.str + `" is not declared - cannot be exported`);
+		}
+	}
+}
+
+
 func (P *Parser) ParseProgram() {
 	P.Trace("Program");
+	
 	P.OpenScope();
 	P.Expect(Scanner.PACKAGE);
-	P.ParseIdent();
+	pkg := P.comp.pkgs[0];
+	pkg.obj = P.ParseIdentDecl(Object.PACKAGE);
 	P.Optional(Scanner.SEMICOLON);
 	
 	{	P.OpenScope();
+		pkg.scope = P.top_scope;
 		for P.tok == Scanner.IMPORT {
 			P.ParseImportDecl();
 			P.Optional(Scanner.SEMICOLON);
@@ -1301,6 +1337,8 @@ func (P *Parser) ParseProgram() {
 			P.ParseDeclaration();
 			P.Optional(Scanner.SEMICOLON);
 		}
+		
+		P.MarkExports();
 		P.CloseScope();
 	}
 	

usr/gri/gosrc/scanner.go

@@ -415,7 +415,8 @@ func (S *Scanner) LineCol(pos int) (line, col int) {
 
 func (S *Scanner) Error(pos int, msg string) {
 	const errdist = 10;
-	if pos > S.errpos + errdist || S.nerrors == 0 {
+	delta := pos - S.errpos;  // may be negative!
+	if delta < errdist || delta > errdist || S.nerrors == 0 {
 		line, col := S.LineCol(pos);
 		if VerboseMsgs {
 			print S.filename, ":", line, ":", col, ": ", msg, "\n";

usr/gri/gosrc/test_parser.go

@@ -14,7 +14,7 @@ func Parse(filename, src string, verbose int) {
 	S.Open(filename, src);
 	
 	P := new(Parser.Parser);
-	P.Open(S, verbose);
+	P.Open(nil, S, verbose);
 	
 	P.ParseProgram();
 }