weekly snapshot:

format.go:
- better error handling, indentation, support for defaults,
  environments for custom formatters, cleanups (more functionality, less code)

pretty.go:
- better comment printing using format.go

made test script more robust

TBR=r
DELTA=622  (175 added, 305 deleted, 142 changed)
OCL=28956
CL=28956

usr/gri/pretty/ast.txt

@@ -49,7 +49,7 @@ ast.Decl =
 // Comments
 
 ast.Comment =
-	Text:string "\n";
+	Text:string [Text:isMultiLineComment "\n"];
 
 ast.Comments =
 	{*};
@@ -305,9 +305,13 @@ ast.BadDecl =
 ast.GenDecl =
 	Doc
 	Tok " "
-	[Lparen:isValidPos "(" >> "\t" "\n"]
+	(	Lparen:isValidPos
+		>> "\t" "(\n"
 		{Specs / ";\n"}
-	[Rparen:isValidPos << "\n" ")"];
+		<<
+		"\n)"
+	|	{Specs / ";\n"}
+	);
 
 ast.FuncDecl =
 	"func " ["(" Recv ") "] Name Type:funcSignature

usr/gri/pretty/format_test.go

@@ -6,12 +6,17 @@ package format
 
 import (
 	"format";
+	"io";
 	"testing";
 )
 
 
 func check(t *testing.T, form, expected string, args ...) {
-	result := format.ParseOrDie(form, nil).Sprint(args);
+	f, err := format.Parse(io.StringBytes(form), nil);
+	if err != nil {
+		panic(err.String());
+	}
+	result := f.Sprint(args);
 	if result != expected {
 		t.Errorf(
 			"format  : %s\nresult  : `%s`\nexpected: `%s`\n\n",
@@ -39,7 +44,6 @@ func Test0(t *testing.T) {
 
 
 // ----------------------------------------------------------------------------
-// - default formatting of basic type int
 // - formatting of a struct
 
 type T1 struct {
@@ -47,6 +51,7 @@ type T1 struct {
 }
 
 const F1 =
+	`int = "%d";`
 	`format.T1 = "<" a ">";`
 
 func Test1(t *testing.T) {
@@ -56,7 +61,6 @@ func Test1(t *testing.T) {
 
 // ----------------------------------------------------------------------------
 // - formatting of a struct with an optional field (pointer)
-// - default formatting for pointers
 
 type T2 struct {
 	s string;
@@ -65,11 +69,14 @@ type T2 struct {
 
 const F2a =
 	F1 +
+	`string = "%s";`
 	`pointer = *;`
 	`format.T2 = s ["-" p "-"];`
 	
 const F2b =
 	F1 +
+	`string = "%s";`
+	`pointer = *;`
 	`format.T2 = s ("-" p "-" | "empty");`;
 	
 func Test2(t *testing.T) {
@@ -88,9 +95,14 @@ type T3 struct {
 }
 
 const F3a =
+	`default = "%v";`
+	`array = *;`
 	`format.T3 = s  {" " a a / ","};`
 
 const F3b =
+	`int = "%d";`
+	`string = "%s";`
+	`array = *;`
 	`nil = ;`
 	`empty = *:nil;`
 	`format.T3 = s [a:empty ": " {a / "-"}]`
@@ -112,11 +124,17 @@ type T4 struct {
 }
 
 const F4a =
+	`int = "%d";`
+	`pointer = *;`
+	`array = *;`
 	`nil = ;`
 	`empty = *:nil;`
 	`format.T4 = "<" (x:empty x | "-") ">" `
 
 const F4b =
+	`int = "%d";`
+	`pointer = *;`
+	`array = *;`
 	`nil = ;`
 	`empty = *:nil;`
 	`format.T4 = "<" (a:empty {a / ", "} | "-") ">" `

usr/gri/pretty/pretty.go

@@ -94,20 +94,32 @@ func (h *ErrorHandler) Error(pos token.Position, msg string) {
 }
 
 
-func isValidPos(w io.Writer, value interface{}, name string) bool {
+func isValidPos(w io.Writer, env, value interface{}, name string) bool {
 	return value.(token.Position).Line > 0;
 }
 
 
-func isSend(w io.Writer, value interface{}, name string) bool {
+func isSend(w io.Writer, env, value interface{}, name string) bool {
 	return value.(ast.ChanDir) & ast.SEND != 0;
 }
 
 
-func isRecv(w io.Writer, value interface{}, name string) bool {
+func isRecv(w io.Writer, env, value interface{}, name string) bool {
 	return value.(ast.ChanDir) & ast.RECV != 0;
 }
 
+func isMultiLineComment(w io.Writer, env, value interface{}, name string) bool {
+	return value.([]byte)[1] == '*'
+}
+
+
+var fmap = format.FormatterMap{
+	"isValidPos": isValidPos,
+	"isSend": isSend,
+	"isRecv": isRecv,
+	"isMultiLineComment": isMultiLineComment,
+}
+
 
 func main() {
 	// handle flags
@@ -129,7 +141,7 @@ func main() {
 		fmt.Fprintf(os.Stderr, "%s: %v\n", ast_txt, err);
 		os.Exit(1);
 	}
-	ast_format, err := format.Parse(src, format.FormatterMap{"isValidPos": isValidPos, "isSend": isSend, "isRecv": isRecv});
+	ast_format, err := format.Parse(src, fmap);
 	if err != nil {
 		fmt.Fprintf(os.Stderr, "%s: format errors:\n%s", ast_txt, err);
 		os.Exit(1);
@@ -156,7 +168,13 @@ func main() {
 		if !*silent {
 			tw := makeTabwriter(os.Stdout);
 			if *formatter {
-				ast_format.Fprint(tw, prog);
+				var optSemi bool;  // formatting environment
+				_, err := ast_format.Fprint(tw, &optSemi, prog);
+				if err != nil {
+					fmt.Fprintf(os.Stderr, "format error$$: %s", err);
+					exitcode = 1;
+					continue;  // proceed with next file
+				}
 			} else {
 				var p astPrinter.Printer;
 				p.Init(tw, nil, nil /*prog.Comments*/, false);

usr/gri/pretty/symboltable.go

@@ -69,7 +69,7 @@ type Object struct {
 func (obj *Object) IsExported() bool {
 	switch obj.Kind {
 	case NONE /* FUNC for now */, CONST, TYPE, VAR, FUNC:
-		ch, size := utf8.DecodeRuneInString(obj.Ident,  0);
+		ch, size := utf8.DecodeRuneInString(obj.Ident);
 		return unicode.IsUpper(ch);
 	}
 	return false;

usr/gri/pretty/test.sh

@@ -36,8 +36,7 @@ apply1() {
 
 # apply to local files
 applydot() {
-	for F in *.go
-	do
+	for F in `find . -name "*.go" | grep -v "OLD" | grep -v "._"`; do
 		apply1 $1 $F
 	done
 }
@@ -45,7 +44,7 @@ applydot() {
 
 # apply to all .go files we can find
 apply() {
-	for F in `find $GOROOT -name "*.go" | grep -v "OLD"`; do
+	for F in `find $GOROOT -name "*.go" | grep -v "OLD" | grep -v "._"`; do
 		apply1 $1 $F
 	done
 }