remove lots of accumulated crud:

- delete utility files which contained functionality that is now elsewhere
  (or saved the files away for now)
- cleanup Makefile (remove unnecessary deps)
- minor adjustments to godoc, fixed a couple of bugs
- make pretty.go self-contained

TBR=r
DELTA=625  (81 added, 510 deleted, 34 changed)
OCL=27700
CL=27702

11 files changed, 113 insertions, 546 deletions

diff --git a/usr/gri/pretty/Makefile b/usr/gri/pretty/Makefile
index 3546aaa21..c00163fb6 100644
--- a/usr/gri/pretty/Makefile
+++ b/usr/gri/pretty/Makefile
@@ -23,28 +23,16 @@ smoketest: pretty
 	./test.sh astprinter.go
 
 install: pretty godoc untab
-	cp pretty $(HOME)/bin/pretty
 	cp godoc $(HOME)/bin/godoc
+	cp pretty $(HOME)/bin/pretty
 	cp untab $(HOME)/bin/untab
 
 clean:
 	rm -f pretty untab godoc *.6 *.a 6.out *~
 
-godoc.6:	docprinter.6 compilation.6 comment.6
-
-pretty.6:	 platform.6 astprinter.6 compilation.6
-
-compilation.6:	 platform.6 typechecker.6
-
-symboltable.6:
-
-platform.6:	 utils.6
-
-astprinter.6:	 utils.6 symboltable.6
-
-docprinter.6:	astprinter.6
+godoc.6:	astprinter.6 comment.6 docprinter.6
 
-comment.6:
+pretty.6:	 astprinter.6
 
 %.6:	%.go
 	$(G) $(F) $<
diff --git a/usr/gri/pretty/astprinter.go b/usr/gri/pretty/astprinter.go
index 70662e5f7..033cb1a3a 100644
--- a/usr/gri/pretty/astprinter.go
+++ b/usr/gri/pretty/astprinter.go
@@ -5,17 +5,12 @@
 package astPrinter
 
 import (
-	"container/vector";
 	"flag";
 	"fmt";
 	"go/ast";
 	"go/token";
 	"io";
 	"os";
-	"strings";
-	"tabwriter";
-	"unicode";
-	"utf8";
 )
 
 
@@ -56,16 +51,9 @@ func assert(pred bool) {
 }
 
 
-// TODO this should be an AST method
-func isExported(name *ast.Ident) bool {
-	ch, len := utf8.DecodeRuneInString(name.Value, 0);
-	return unicode.IsUpper(ch);
-}
-
-
 func hasExportedNames(names []*ast.Ident) bool {
 	for i, name := range names {
-		if isExported(name) {
+		if name.IsExported() {
 			return true;
 		}
 	}
@@ -315,7 +303,7 @@ func (P *Printer) TaggedString(pos token.Position, tag, s, endtag string) {
 	nlcount := 0;
 	if P.full {
 		for ; P.hasComment(pos); P.nextComments() {
-			// we have a comment group that comes before the string
+			// we have a comment that comes before the string
 			comment := P.comments[P.cindex];
 			ctext := string(comment.Text);  // TODO get rid of string conversion here
 
@@ -508,7 +496,7 @@ func (P *Printer) Idents(list []*ast.Ident, full bool) int {
 			P.separator = blank;
 			P.state = inside_list;
 		}
-		if full || isExported(x) {
+		if full || x.IsExported() {
 			P.Expr(x);
 			n++;
 		}
diff --git a/usr/gri/pretty/compilation.go b/usr/gri/pretty/compilation.go
deleted file mode 100644
index b03d6b33f..000000000
--- a/usr/gri/pretty/compilation.go
+++ /dev/null
@@ -1,190 +0,0 @@
-// Copyright 2009 The Go Authors.  All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package Compilation
-
-import (
-	"container/vector";
-	"fmt";
-	"go/ast";
-	"go/parser";
-	"go/scanner";
-	"go/token";
-	"os";
-	"platform";
-	"sort";
-	"typechecker";
-	"utf8";
-	"utils";
-)
-
-
-func assert(b bool) {
-	if !b {
-		panic("assertion failed");
-	}
-}
-
-
-type Flags struct {
-	Verbose bool;
-	Deps bool;
-	Columns bool;
-}
-
-
-type Error struct {
-	Pos token.Position;
-	Msg string;
-}
-
-
-type ErrorList []Error
-
-func (list ErrorList) Len() int { return len(list); }
-func (list ErrorList) Less(i, j int) bool { return list[i].Pos.Offset < list[j].Pos.Offset; }
-func (list ErrorList) Swap(i, j int) { list[i], list[j] = list[j], list[i]; }
-
-
-type errorHandler struct {
-	filename string;
-	columns bool;
-	errline int;
-	errors vector.Vector;
-}
-
-
-func (h *errorHandler) Init(filename string, columns bool) {
-	h.filename = filename;
-	h.columns = columns;
-	h.errors.Init(0);
-}
-
-
-func (h *errorHandler) Error(pos token.Position, msg string) {
-	// only report errors that are on a new line
-	// in the hope to avoid most follow-up errors
-	if pos.Line == h.errline {
-		return;
-	}
-
-	// report error
-	fmt.Printf("%s:%d:", h.filename, pos.Line);
-	if h.columns {
-		fmt.Printf("%d:", pos.Column);
-	}
-	fmt.Printf(" %s\n", msg);
-
-	// collect the error
-	h.errors.Push(Error{pos, msg});
-	h.errline = pos.Line;
-}
-
-
-func Compile(filename string, flags *Flags) (*ast.Program, ErrorList) {
-	src, os_err := os.Open(filename, os.O_RDONLY, 0);
-	defer src.Close();
-	if os_err != nil {
-		fmt.Printf("cannot open %s (%s)\n", filename, os_err.String());
-		return nil, nil;
-	}
-
-	var err errorHandler;
-	err.Init(filename, flags.Columns);
-
-	mode := parser.ParseComments;
-	if flags.Verbose {
-		mode |= parser.Trace;
-	}
-	prog, ok2 := parser.Parse(src, &err, mode);
-
-	if ok2 {
-		TypeChecker.CheckProgram(&err, prog);
-	}
-
-	// convert error list and sort it
-	errors := make(ErrorList, err.errors.Len());
-	for i := 0; i < err.errors.Len(); i++ {
-		errors[i] = err.errors.At(i).(Error);
-	}
-	sort.Sort(errors);
-
-	return prog, errors;
-}
-
-
-func fileExists(name string) bool {
-	dir, err := os.Stat(name);
-	return err == nil;
-}
-
-/*
-func printDep(localset map [string] bool, wset *vector.Vector, decl ast.Decl2) {
-	src := decl.Val.(*ast.BasicLit).Val;
-	src = src[1 : len(src) - 1];  // strip "'s
-
-	// ignore files when they are seen a 2nd time
-	dummy, found := localset[src];
-	if !found {
-		localset[src] = true;
-		if fileExists(src + ".go") {
-			wset.Push(src);
-			fmt.Printf(" %s.6", src);
-		} else if
-			fileExists(Platform.GOROOT + "/pkg/" + src + ".6") ||
-			fileExists(Platform.GOROOT + "/pkg/" + src + ".a") {
-
-		} else {
-			// TODO should collect these and print later
-			//print("missing file: ", src, "\n");
-		}
-	}
-}
-*/
-
-
-func addDeps(globalset map [string] bool, wset *vector.Vector, src_file string, flags *Flags) {
-	dummy, found := globalset[src_file];
-	if !found {
-		globalset[src_file] = true;
-
-		prog, errors := Compile(src_file, flags);
-		if errors == nil || len(errors) > 0 {
-			return;
-		}
-
-		nimports := len(prog.Decls);
-		if nimports > 0 {
-			fmt.Printf("%s.6:\t", src_file);
-
-			localset := make(map [string] bool);
-			for i := 0; i < nimports; i++ {
-				decl := prog.Decls[i];
-				panic();
-				/*
-				assert(decl.Tok == scanner.IMPORT);
-				if decl.List == nil {
-					printDep(localset, wset, decl);
-				} else {
-					for j := 0; j < decl.List.Len(); j++ {
-						printDep(localset, wset, decl.List.At(j).(*ast.Decl));
-					}
-				}
-				*/
-			}
-			print("\n\n");
-		}
-	}
-}
-
-
-func ComputeDeps(src_file string, flags *Flags) {
-	panic("dependency printing currently disabled");
-	globalset := make(map [string] bool);
-	wset := vector.New(0);
-	wset.Push(Utils.TrimExt(src_file, ".go"));
-	for wset.Len() > 0 {
-		addDeps(globalset, wset, wset.Pop().(string), flags);
-	}
-}
diff --git a/usr/gri/pretty/docprinter.go b/usr/gri/pretty/docprinter.go
index 9f053e4d4..87b973e27 100644
--- a/usr/gri/pretty/docprinter.go
+++ b/usr/gri/pretty/docprinter.go
@@ -16,10 +16,6 @@ import (
 	"regexp";
 	"sort";
 	"strings";
-	"unicode";
-	"utf8";
-
-	"astprinter";
 )
 
 
diff --git a/usr/gri/pretty/godoc.go b/usr/gri/pretty/godoc.go
index 300081ec6..3f91d6510 100644
--- a/usr/gri/pretty/godoc.go
+++ b/usr/gri/pretty/godoc.go
@@ -53,36 +53,30 @@ import (
 )
 
 
-// TODO
-// - uniform use of path, filename, dirname, pakname, etc.
-// - fix weirdness with double-/'s in paths
-// - split http service into its own source file
-
 // TODO: tell flag package about usage string
 const usageString =
 	"usage: godoc package [name ...]\n"
 	"	godoc -http=:6060\n"
 
-var (
-	goroot string;
+const Pkg = "/pkg/"	// name for auto-generated package documentation tree
 
+
+var (
 	verbose = flag.Bool("v", false, "verbose mode");
 
-	// server control
-	httpaddr = flag.String("http", "", "HTTP service address (e.g., ':6060')");
+	// file system roots
+	goroot string;
+	pkgroot = flag.String("pkgroot", "src/lib", "root package source directory (if unrooted, relative to goroot)");
 
 	// layout control
 	tabwidth = flag.Int("tabwidth", 4, "tab width");
 	usetabs = flag.Bool("tabs", false, "align with tabs instead of spaces");
-
 	html = flag.Bool("html", false, "print HTML in command-line mode");
 
-	pkgroot = flag.String("pkgroot", "src/lib", "root package source directory (if unrooted, relative to goroot)");
+	// server control
+	httpaddr = flag.String("http", "", "HTTP service address (e.g., ':6060')");
 )
 
-const (
-	Pkg = "/pkg/"	// name for auto-generated package documentation tree
-)
 
 func init() {
 	var err os.Error;
@@ -140,13 +134,16 @@ type rawError struct {
 	msg string;
 }
 
+
 type rawErrorVector struct {
 	vector.Vector;
 }
 
+
 func (v *rawErrorVector) At(i int) rawError { return v.Vector.At(i).(rawError) }
 func (v *rawErrorVector) Less(i, j int) bool { return v.At(i).pos.Offset < v.At(j).pos.Offset; }
 
+
 func (v *rawErrorVector) Error(pos token.Position, msg string) {
 	// only collect errors that are on a new line
 	// in the hope to avoid most follow-up errors
@@ -167,17 +164,20 @@ type parseError struct {
 	msg string;	// error message
 }
 
+
 // All the errors in the parsed file, plus surrounding source code.
 // Each error has a slice giving the source text preceding it
 // (starting where the last error occurred).  The final element in list[]
 // has msg = "", to give the remainder of the source code.
 // This data structure is handed to the templates parseerror.txt and parseerror.html.
+//
 type parseErrors struct {
 	filename string;	// path to file
 	list []parseError;	// the errors
 	src []byte;	// the file's entire source code
 }
 
+
 // Parses a file (path) and returns the corresponding AST and
 // a sorted list (by file position) of errors, if any.
 //
@@ -425,12 +425,15 @@ func serveFile(c *http.Conn, req *http.Request) {
 
 	case req.Url.Path == "/doc/root.html":
 		// hide landing page from its real name
+		// TODO why - there is no reason for this (remove eventually)
 		http.NotFound(c, req);
 
 	case pathutil.Ext(req.Url.Path) == ".go":
-		serveGoSource(c, req.Url.Path[1:len(req.Url.Path)]);
+		serveGoSource(c, req.Url.Path[1 : len(req.Url.Path)]);  // strip leading '/' from name
 
 	default:
+		// TODO not good enough - don't want to download files
+		// want to see them
 		fileServer.ServeHTTP(c, req);
 	}
 }
@@ -611,13 +614,13 @@ func servePackageList(c *http.Conn, info *pakInfo) {
 
 // Return package or packages named by name.
 // Name is either an import string or a directory,
-// like you'd see in $GOROOT/pkg/ once the 6g
-// tools can handle a hierarchy there.
+// like you'd see in $GOROOT/pkg/.
 //
 // Examples:
 //	"math"	- single package made up of directory
 //	"container"	- directory listing
 //	"container/vector"	- single package in container directory
+//
 func findPackages(name string) *pakInfo {
 	info := new(pakInfo);
 
@@ -733,6 +736,7 @@ func main() {
 			log.Stderrf("Go Documentation Server\n");
 			log.Stderrf("address = %s\n", *httpaddr);
 			log.Stderrf("goroot = %s\n", goroot);
+			log.Stderrf("pkgroot = %s\n", *pkgroot);
 			handler = LoggingHandler(handler);
 		}
 
diff --git a/usr/gri/pretty/package.html b/usr/gri/pretty/package.html
index 5e3cbc40b..f9fd76373 100644
--- a/usr/gri/pretty/package.html
+++ b/usr/gri/pretty/package.html
@@ -26,11 +26,11 @@
 	{.end}
 {.end}
 {.section Types}
-	<hr />
 	{.repeated section @}
+		<hr />
 		<h2>type {.section Type}{Name|html}{.end}</h2>
-		{Doc}
-		<p><code>{Decl|html}</code></p>
+		{Doc|html-comment}
+		<p><pre>{Decl|html}</pre></p>
 		{.repeated section Factories}
 			<h3>func {Name|html}</h3>
 			<p><code>{Decl|html}</code></p>
diff --git a/usr/gri/pretty/platform.go b/usr/gri/pretty/platform.go
deleted file mode 100644
index cbd4678e3..000000000
--- a/usr/gri/pretty/platform.go
+++ /dev/null
@@ -1,84 +0,0 @@
-// Copyright 2009 The Go Authors.  All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package Platform
-
-import IO "io"
-import OS "os"
-import Utils "utils"
-
-
-// ----------------------------------------------------------------------------
-// Environment
-
-var
-	GOARCH,
-	GOOS,
-	GOROOT,
-	USER string;
-
-func init() {
-	var e OS.Error;
-
-	GOARCH, e = OS.Getenv("GOARCH");
-	GOOS, e = OS.Getenv("GOOS");
-	GOROOT, e = OS.Getenv("GOROOT");
-	USER, e = OS.Getenv("USER");
-}
-
-
-// ----------------------------------------------------------------------------
-// I/O
-
-const (
-	MAGIC_obj_file = "@gri-go.7@v0";  // make it clear that it cannot be a source file
-	Src_file_ext = ".go";
-	Obj_file_ext = ".7";
-)
-
-func readfile(filename string) ([]byte, OS.Error) {
-	f, err := OS.Open(filename, OS.O_RDONLY, 0);
-	if err != nil {
-		return []byte{}, err;
-	}
-	var buf [1<<20]byte;
-	n, err1 := IO.FullRead(f, &buf);
-	f.Close();
-	if err1 == IO.ErrEOF {
-		err1 = nil;
-	}
-	return buf[0:n], err1;
-}
-
-func writefile(name, data string) OS.Error {
-	fd, err := OS.Open(name, OS.O_WRONLY, 0);
-	if err != nil {
-		return err;
-	}
-	n, err1 := IO.WriteString(fd, data);
-	fd.Close();
-	return err1;
-}
-
-func ReadObjectFile(filename string) ([]byte, bool) {
-	data, err := readfile(filename + Obj_file_ext);
-	magic := MAGIC_obj_file;  // TODO remove once len(constant) works
-	if err == nil && len(data) >= len(magic) && string(data[0 : len(magic)]) == magic {
-		return data, true;
-	}
-	return []byte{}, false;
-}
-
-
-func ReadSourceFile(name string) ([]byte, bool) {
-	name = Utils.TrimExt(name, Src_file_ext) + Src_file_ext;
-	data, err := readfile(name);
-	return data, err == nil;
-}
-
-
-func WriteObjectFile(name string, data string) bool {
-	name = Utils.TrimExt(Utils.BaseName(name), Src_file_ext) + Obj_file_ext;
-	return writefile(name, data) != nil;
-}
diff --git a/usr/gri/pretty/pretty.go b/usr/gri/pretty/pretty.go
index 2db790d93..c342b72c2 100644
--- a/usr/gri/pretty/pretty.go
+++ b/usr/gri/pretty/pretty.go
@@ -5,31 +5,37 @@
 package main
 
 import (
-	"astprinter";
-	"compilation";
 	"flag";
+	"fmt";
 	"go/ast";
+	"go/parser";
+	"go/token";
+	"io";
+	"log";
 	"os";
-	"platform";
 	"tabwriter";
+
+	"astprinter";
 )
 
 
 var (
-	flags Compilation.Flags;
+	columnsDefault bool;
+
+	// operation modes
+	columns = flag.Bool("columns", columnsDefault, "report column no. in error messages");
 	silent = flag.Bool("s", false, "silent mode: no pretty print output");
+	verbose = flag.Bool("v", false, "verbose mode: trace parsing");
 
 	// layout control
-	html = flag.Bool("html", false, "generate html");
-	tabwidth = flag.Int("pretty_tabwidth", 4, "tab width");
-	usetabs = flag.Bool("pretty_usetabs", false, "align with tabs instead of blanks");
+	tabwidth = flag.Int("tabwidth", 4, "tab width");
+	usetabs = flag.Bool("usetabs", false, "align with tabs instead of blanks");
 )
 
 
 func init() {
-	flag.BoolVar(&flags.Verbose, "v", false, "verbose mode: trace parsing");
-	flag.BoolVar(&flags.Deps, "d", false, "print dependency information only");
-	flag.BoolVar(&flags.Columns, "columns", Platform.USER == "gri", "print column info in error messages");
+	user, err := os.Getenv("USER");
+	columnsDefault = user == "gri";
 }
 
 
@@ -40,47 +46,90 @@ func usage() {
 }
 
 
-func print(prog *ast.Program) {
-	// initialize tabwriter for nicely aligned output
+// TODO(gri) use library function for this once it exists
+func readFile(filename string) ([]byte, os.Error) {
+	f, err := os.Open(filename, os.O_RDONLY, 0);
+	if err != nil {
+		return nil, err;
+	}
+	defer f.Close();
+	var b io.ByteBuffer;
+	if n, err := io.Copy(f, &b); err != nil {
+		return nil, err;
+	}
+	return b.Data(), nil;
+}
+
+
+// TODO(gri) move this function into tabwriter.go? (also used in godoc)
+func makeTabwriter(writer io.Write) *tabwriter.Writer {
 	padchar := byte(' ');
 	if *usetabs {
 		padchar = '\t';
 	}
-	writer := tabwriter.NewWriter(os.Stdout, *tabwidth, 1, padchar, tabwriter.FilterHTML);
+	return tabwriter.NewWriter(writer, *tabwidth, 1, padchar, tabwriter.FilterHTML);
+}
+
 
-	// initialize printer
-	var printer astPrinter.Printer;
-	printer.Init(writer, nil, prog.Comments, *html);
+// TODO(gri) move this into parser as default handler
+type ErrorHandler struct {
+	filename string;
+	lastline int;
+	columns bool;
+}
 
-	printer.DoProgram(prog);
 
-	// flush any pending output
-	writer.Flush();
+func (h *ErrorHandler) Error(pos token.Position, msg string) {
+	// only report errors that are on a new line
+	// in the hope to avoid most follow-up errors
+	if pos.Line == h.lastline {
+		return;
+	}
+
+	// report error
+	fmt.Printf("%s:%d:", h.filename, pos.Line);
+	if h.columns {
+		fmt.Printf("%d:", pos.Column);
+	}
+	fmt.Printf(" %s\n", msg);
 }
 
 
 func main() {
+	// handle flags
 	flag.Parse();
-
 	if flag.NFlag() == 0 && flag.NArg() == 0 {
 		usage();
 	}
 
+	// determine parsing mode
+	mode := parser.ParseComments;
+	if *verbose {
+		mode |= parser.Trace;
+	}
+
 	// process files
 	for i := 0; i < flag.NArg(); i++ {
-		src_file := flag.Arg(i);
-
-		if flags.Deps {
-			Compilation.ComputeDeps(src_file, &flags);
-
-		} else {
-			prog, errors := Compilation.Compile(src_file, &flags);
-			if errors == nil || len(errors) > 0 {
-				sys.Exit(1);
-			}
-			if !*silent {
-				print(prog);
-			}
+		filename := flag.Arg(i);
+
+		src, err := readFile(filename);
+		if err != nil {
+			log.Stderrf("ReadFile %s: %v", filename, err);
+			continue;
+		}
+
+		prog, ok := parser.Parse(src, &ErrorHandler{filename, 0, false}, mode);
+		if !ok {
+			log.Stderr("Parse %s: syntax errors", filename);
+			continue;
+		}
+
+		if !*silent {
+			var printer astPrinter.Printer;
+			writer := makeTabwriter(os.Stdout);
+			printer.Init(writer, nil, nil /*prog.Comments*/, false);
+			printer.DoProgram(prog);
+			writer.Flush();
 		}
 	}
 }
diff --git a/usr/gri/pretty/selftest2.go b/usr/gri/pretty/selftest2.go
index a3de38b1b..783d72d9c 100644
--- a/usr/gri/pretty/selftest2.go
+++ b/usr/gri/pretty/selftest2.go
@@ -5,7 +5,7 @@
 package main
 
 import (
-	"vector";  // not needed
+	"container/vector";  // not needed
 	"utf8";  // not needed
 	Fmt "fmt"
 )
diff --git a/usr/gri/pretty/typechecker.go b/usr/gri/pretty/typechecker.go
deleted file mode 100644
index 4dde63b1f..000000000
--- a/usr/gri/pretty/typechecker.go
+++ /dev/null
@@ -1,93 +0,0 @@
-// Copyright 2009 The Go Authors.  All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package TypeChecker
-
-import (
-	"go/ast";
-	"go/scanner";
-	"go/token";
-)
-
-
-type state struct {
-	// setup
-	err scanner.ErrorHandler;
-}
-
-
-func (s *state) Init(err scanner.ErrorHandler) {
-	s.err = err;
-}
-
-
-// ----------------------------------------------------------------------------
-// Support
-
-func unimplemented() {
-	panic("unimplemented");
-}
-
-
-func unreachable() {
-	panic("unreachable");
-}
-
-
-func assert(pred bool) {
-	if !pred {
-		panic("assertion failed");
-	}
-}
-
-
-func (s *state) Error(pos token.Position, msg string) {
-	s.err.Error(pos, msg);
-}
-
-
-// ----------------------------------------------------------------------------
-
-func (s *state) CheckType() {
-}
-
-
-/*
-func (s *state) CheckDeclaration(d *AST.Decl) {
-	if d.Tok != token.FUNC && d.List != nil {
-		// group of parenthesized declarations
-		for i := 0; i < d.List.Len(); i++ {
-			s.CheckDeclaration(d.List.At(i).(*AST.Decl))
-		}
-
-	} else {
-		// single declaration
-		switch d.Tok {
-		case token.IMPORT:
-		case token.CONST:
-		case token.VAR:
-		case token.TYPE:
-		case token.FUNC:
-		default:
-			unreachable();
-		}
-	}
-}
-*/
-
-
-func (s *state) CheckProgram(p *ast.Program) {
-	for i := 0; i < len(p.Decls); i++ {
-		//s.CheckDeclaration(p.Decls[i].(*AST.Decl));
-	}
-}
-
-
-// ----------------------------------------------------------------------------
-
-func CheckProgram(err scanner.ErrorHandler, p *ast.Program) {
-	var s state;
-	s.Init(err);
-	s.CheckProgram(p);
-}
diff --git a/usr/gri/pretty/utils.go b/usr/gri/pretty/utils.go
deleted file mode 100644
index baacc75de..000000000
--- a/usr/gri/pretty/utils.go
+++ /dev/null
@@ -1,91 +0,0 @@
-// Copyright 2009 The Go Authors.  All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package Utils
-
-
-func BaseName(s string) string {
-	// TODO this is not correct for non-ASCII strings!
-	i := len(s) - 1;
-	for i >= 0 && s[i] != '/' {
-		if s[i] > 128 {
-			panic("non-ASCII string");
-		}
-		i--;
-	}
-	return s[i + 1 : len(s)];
-}
-
-
-func cleanPath(s string) string {
-	for i := 0; i < len(s); i++ {
-		if s[i] == '/' {
-			i++;
-			j := i;
-			for j < len(s) && s[j] == '/' {
-				j++;
-			}
-			if j > i {  // more then one '/'
-				return s[0 : i] + cleanPath(s[j : len(s)]);
-			}
-		}
-	}
-	return s;
-}
-
-
-// Reduce sequences of multiple '/'s into a single '/' and
-// strip any trailing '/' (may result in the empty string).
-func SanitizePath(s string) string {
-	s = cleanPath(s);
-	if s[len(s)-1] == '/' {  // strip trailing '/'
-		s = s[0 : len(s)-1];
-	}
-	return s;
-}
-
-
-func Contains(s, sub string, pos int) bool {
-	end := pos + len(sub);
-	return pos >= 0 && end <= len(s) && s[pos : end] == sub;
-}
-
-
-func TrimExt(s, ext string) string {
-	i := len(s) - len(ext);
-	if i >= 0 && s[i : len(s)] == ext {
-		s = s[0 : i];
-	}
-	return s;
-}
-
-
-func IntToString(x, base int) string {
-	x0 := x;
-	if x < 0 {
-		x = -x;
-		if x < 0 {
-			panic("smallest int not handled");
-		}
-	} else if x == 0 {
-		return "0";
-	}
-
-	// x > 0
-	hex := "0123456789ABCDEF";
-	var buf [32] byte;
-	i := len(buf);
-	for x > 0 {
-		i--;
-		buf[i] = hex[x % base];
-		x /= base;
-	}
-
-	if x0 < 0 {
-		i--;
-		buf[i] = '-';
-	}
-
-	return string(buf[i : len(buf)]);
-}