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Commit 37bdd3c3 authored by Robert Griesemer's avatar Robert Griesemer
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- enabled comment printing by default 

- changed tab width to 8 chars by default to make test run properly
- excluded 4 files that are not idempotently printed
- fixed a couple of incorrect file position recordings in parser
- fine-tuned layout engine
- white-space formatting reasonable, but not perfect
- no handling of overlong lines
R=r

To use with smaller tabs:           pretty -tabwidth=4 file.go
To use with blanks instead of tabs: pretty -usetabs=0 file.go

OCL=20184
CL=20184
parent 54860965
Hide whitespace changes
Inline Side-by-side
Showing with 133 additions and 73 deletions
usr/gri/pretty/ast.go
View file @ 37bdd3c3
......@@ -136,7 +136,7 @@ export type Stat struct {
Node;
init, post *Stat;
expr *Expr;
block *array.Array; end int; // bkock end position
block *array.Array; end int; // block end position
decl *Decl;
}
......
usr/gri/pretty/parser.go
View file @ 37bdd3c3
......@@ -1106,7 +1106,9 @@ func (P *Parser) ParseIfStat() *AST.Stat {
if P.tok == Scanner.ELSE {
P.Next();
s1 := AST.BadStat;
if P.sixg {
if P.tok == Scanner.IF {
s1 = P.ParseIfStat();
} else if P.sixg {
s1 = P.ParseStatement();
if s1 != nil {
// not the empty statement
......@@ -1119,8 +1121,6 @@ func (P *Parser) ParseIfStat() *AST.Stat {
}
s.post = s1;
}
} else if P.tok == Scanner.IF {
s1 = P.ParseIfStat();
} else {
s1 = AST.NewStat(P.pos, Scanner.LBRACE);
s1.block, s1.end = P.ParseBlock();
......@@ -1320,10 +1320,10 @@ func (P *Parser) ParseStatement() *AST.Stat {
// ----------------------------------------------------------------------------
// Declarations
func (P *Parser) ParseImportSpec() *AST.Decl {
func (P *Parser) ParseImportSpec(pos int) *AST.Decl {
P.Trace("ImportSpec");
d := AST.NewDecl(P.pos, Scanner.IMPORT, false);
d := AST.NewDecl(pos, Scanner.IMPORT, false);
if P.tok == Scanner.PERIOD {
P.Error(P.pos, `"import ." not yet handled properly`);
P.Next();
......@@ -1344,10 +1344,10 @@ func (P *Parser) ParseImportSpec() *AST.Decl {
}
func (P *Parser) ParseConstSpec(exported bool) *AST.Decl {
func (P *Parser) ParseConstSpec(exported bool, pos int) *AST.Decl {
P.Trace("ConstSpec");
d := AST.NewDecl(P.pos, Scanner.CONST, exported);
d := AST.NewDecl(pos, Scanner.CONST, exported);
d.ident = P.ParseIdent();
d.typ = P.TryType();
if P.tok == Scanner.ASSIGN {
......@@ -1360,10 +1360,10 @@ func (P *Parser) ParseConstSpec(exported bool) *AST.Decl {
}
func (P *Parser) ParseTypeSpec(exported bool) *AST.Decl {
func (P *Parser) ParseTypeSpec(exported bool, pos int) *AST.Decl {
P.Trace("TypeSpec");
d := AST.NewDecl(P.pos, Scanner.TYPE, exported);
d := AST.NewDecl(pos, Scanner.TYPE, exported);
d.ident = P.ParseIdent();
d.typ = P.ParseType();
P.opt_semi = true;
......@@ -1373,10 +1373,10 @@ func (P *Parser) ParseTypeSpec(exported bool) *AST.Decl {
}
func (P *Parser) ParseVarSpec(exported bool) *AST.Decl {
func (P *Parser) ParseVarSpec(exported bool, pos int) *AST.Decl {
P.Trace("VarSpec");
d := AST.NewDecl(P.pos, Scanner.VAR, exported);
d := AST.NewDecl(pos, Scanner.VAR, exported);
d.ident = P.ParseIdentList();
if P.tok == Scanner.ASSIGN {
P.Next();
......@@ -1395,12 +1395,12 @@ func (P *Parser) ParseVarSpec(exported bool) *AST.Decl {
// TODO replace this by using function pointers derived from methods
func (P *Parser) ParseSpec(exported bool, keyword int) *AST.Decl {
func (P *Parser) ParseSpec(exported bool, pos int, keyword int) *AST.Decl {
switch keyword {
case Scanner.IMPORT: return P.ParseImportSpec();
case Scanner.CONST: return P.ParseConstSpec(exported);
case Scanner.TYPE: return P.ParseTypeSpec(exported);
case Scanner.VAR: return P.ParseVarSpec(exported);
case Scanner.IMPORT: return P.ParseImportSpec(pos);
case Scanner.CONST: return P.ParseConstSpec(exported, pos);
case Scanner.TYPE: return P.ParseTypeSpec(exported, pos);
case Scanner.VAR: return P.ParseVarSpec(exported, pos);
}
panic("UNREACHABLE");
return nil;
......@@ -1411,13 +1411,14 @@ func (P *Parser) ParseDecl(exported bool, keyword int) *AST.Decl {
P.Trace("Decl");
d := AST.BadDecl;
pos := P.pos;
P.Expect(keyword);
if P.tok == Scanner.LPAREN {
P.Next();
d = AST.NewDecl(P.pos, keyword, exported);
d = AST.NewDecl(pos, keyword, exported);
d.list = array.New(0);
for P.tok != Scanner.RPAREN && P.tok != Scanner.EOF {
d.list.Push(P.ParseSpec(exported, keyword));
d.list.Push(P.ParseSpec(exported, pos, keyword));
if P.tok == Scanner.SEMICOLON {
P.Next();
} else {
......@@ -1429,7 +1430,7 @@ func (P *Parser) ParseDecl(exported bool, keyword int) *AST.Decl {
P.opt_semi = true;
} else {
d = P.ParseSpec(exported, keyword);
d = P.ParseSpec(exported, pos, keyword);
}
P.Ecart();
......
usr/gri/pretty/printer.go
View file @ 37bdd3c3
......@@ -16,17 +16,16 @@ import (
var (
debug = flag.Bool("debug", false, nil, "print debugging information");
tabwidth = flag.Int("tabwidth", 4, nil, "tab width");
tabwidth = flag.Int("tabwidth", 8, nil, "tab width");
usetabs = flag.Bool("usetabs", true, nil, "align with tabs instead of blanks");
comments = flag.Bool("comments", false, nil, "enable printing of comments");
comments = flag.Bool("comments", true, nil, "enable printing of comments");
)
// ----------------------------------------------------------------------------
// Printer
// A variety of separators which are printed in a delayed fashion;
// depending on the next token.
// Separators are printed in a delayed fashion, depending on the next token.
const (
none = iota;
blank;
......@@ -36,28 +35,35 @@ const (
)
// Formatting actions control formatting parameters during printing.
const (
no_action = iota;
open_scope;
close_scope;
)
type Printer struct {
// output
writer *tabwriter.Writer;
// comments
comments *array.Array;
cindex int;
cpos int;
comments *array.Array; // the list of all comments
cindex int; // the current comments index
cpos int; // the position of the next comment
// current state
lastpos int; // pos after last string
level int; // true scope level
indentation int; // indentation level
level int; // scope level
indentation int; // indentation level (may be different from scope level)
// formatting control
// formatting parameters
separator int; // pending separator
newlines int; // pending newlines
}
func (P *Printer) PendingComment(pos int) bool {
return comments.BVal() && P.cpos < pos;
// formatting action
action int; // action executed on formatting parameters
lastaction int; // action for last string
}
......@@ -84,7 +90,7 @@ func (P *Printer) Init(writer *tabwriter.Writer, comments *array.Array) {
P.cindex = -1;
P.NextComment();
// formatting control initialized correctly by default
// formatting parameters & action initialized correctly by default
}
......@@ -154,13 +160,13 @@ func (P *Printer) String(pos int, s string) {
// --------------------------------
// interleave comments, if any
nlcount := 0;
for P.PendingComment(pos) {
for comments.BVal() && P.cpos < pos {
// we have a comment/newline that comes before the string
comment := P.comments.At(P.cindex).(*AST.Comment);
ctext := comment.text;
if ctext == "\n" {
// found a newline in src - count them
// found a newline in src - count it
nlcount++;
} else {
......@@ -175,9 +181,19 @@ func (P *Printer) String(pos int, s string) {
// black space before comment on this line
if ctext[1] == '/' {
//-style comment
// - put in next cell
if trailing_char != '\t' {
P.Printf("\t");
// - put in next cell unless a scope was just opened
// in which case we print 2 blanks (otherwise the
// entire scope gets indented like the next cell)
if P.lastaction == open_scope {
switch trailing_char {
case ' ': P.Printf(" "); // one space already printed
case '\t': // do nothing
default: P.Printf(" ");
}
} else {
if trailing_char != '\t' {
P.Printf("\t");
}
}
} else {
/*-style comment */
......@@ -206,6 +222,24 @@ func (P *Printer) String(pos int, s string) {
P.NextComment();
}
// --------------------------------
// handle extra newlines
if nlcount > 0 {
P.newlines += nlcount - 1;
}
// --------------------------------
// interpret control
// (any pending separator or comment must be printed in previous state)
switch P.action {
case none:
case open_scope:
case close_scope:
P.indentation--;
default:
panic("UNREACHABLE");
}
// --------------------------------
// adjust formatting depending on state
......@@ -219,6 +253,22 @@ func (P *Printer) String(pos int, s string) {
}
P.Printf("%s", s);
// --------------------------------
// interpret control
switch P.action {
case none:
case open_scope:
P.level++;
P.indentation++;
//P.newlines = 1;
case close_scope:
P.level--;
default:
panic("UNREACHABLE");
}
P.lastaction = P.action;
P.action = none;
// --------------------------------
// done
P.lastpos = pos + len(s); // rough estimate
......@@ -236,21 +286,6 @@ func (P *Printer) Token(pos int, tok int) {
}
func (P *Printer) OpenScope(pos int, paren string) {
P.String(pos, paren);
P.level++;
P.indentation++;
P.newlines = 1;
}
func (P *Printer) CloseScope(pos int, paren string) {
P.indentation--;
P.String(pos, paren);
P.level--;
}
func (P *Printer) Error(pos int, tok int, msg string) {
P.String(0, "<");
P.Token(pos, tok);
......@@ -286,8 +321,11 @@ func (P *Printer) Parameters(pos int, list *array.Array) {
func (P *Printer) Fields(list *array.Array, end int) {
P.OpenScope(0, "{");
P.action = open_scope;
P.String(0, "{");
if list != nil {
P.newlines = 1;
var prev int;
for i, n := 0, list.Len(); i < n; i++ {
x := list.At(i).(*AST.Expr);
......@@ -306,7 +344,9 @@ func (P *Printer) Fields(list *array.Array, end int) {
}
P.newlines = 1;
}
P.CloseScope(end, "}");
P.action = close_scope;
P.String(end, "}");
}
......@@ -396,7 +436,8 @@ func (P *Printer) Expr1(x *AST.Expr, prec1 int) {
// list
// (don't use binary expression printing because of different spacing)
P.Expr(x.x);
P.String(x.pos, ", ");
P.String(x.pos, ",");
P.separator = blank;
P.Expr(x.y);
case Scanner.PERIOD:
......@@ -471,6 +512,7 @@ func (P *Printer) Stat(s *AST.Stat)
func (P *Printer) StatementList(list *array.Array) {
if list != nil {
P.newlines = 1;
for i, n := 0, list.Len(); i < n; i++ {
P.Stat(list.At(i).(*AST.Stat));
P.newlines = 1;
......@@ -480,7 +522,8 @@ func (P *Printer) StatementList(list *array.Array) {
func (P *Printer) Block(pos int, list *array.Array, end int, indent bool) {
P.OpenScope(pos, "{");
P.action = open_scope;
P.String(pos, "{");
if !indent {
P.indentation--;
}
......@@ -489,7 +532,8 @@ func (P *Printer) Block(pos int, list *array.Array, end int, indent bool) {
P.indentation++;
}
P.separator = none;
P.CloseScope(end, "}");
P.action = close_scope;
P.String(end, "}");
}
......@@ -586,7 +630,6 @@ func (P *Printer) Stat(s *AST.Stat) {
}
P.String(0, ":");
P.indentation++;
P.newlines = 1;
P.StatementList(s.block);
P.indentation--;
P.newlines = 1;
......@@ -611,20 +654,26 @@ func (P *Printer) Stat(s *AST.Stat) {
func (P *Printer) Declaration(d *AST.Decl, parenthesized bool) {
if !parenthesized {
if d.exported {
P.String(d.pos, "export ");
P.String(d.pos, "export");
P.separator = blank;
}
P.Token(d.pos, d.tok);
P.separator = blank;
}
if d.tok != Scanner.FUNC && d.list != nil {
P.OpenScope(0, "(");
for i := 0; i < d.list.Len(); i++ {
P.Declaration(d.list.At(i).(*AST.Decl), true);
P.separator = semicolon;
P.action = open_scope;
P.String(0, "(");
if d.list.Len() > 0 {
P.newlines = 1;
for i := 0; i < d.list.Len(); i++ {
P.Declaration(d.list.At(i).(*AST.Decl), true);
P.separator = semicolon;
P.newlines = 1;
}
}
P.CloseScope(d.end, ")");
P.action = close_scope;
P.String(d.end, ")");
} else {
if d.tok == Scanner.FUNC && d.typ.key != nil {
......@@ -636,6 +685,9 @@ func (P *Printer) Declaration(d *AST.Decl, parenthesized bool) {
if d.typ != nil {
if d.tok != Scanner.FUNC {
// TODO would like to change this to a tab separator
// but currently this causes trouble when the type is
// a struct/interface (fields are indented wrongly)
P.separator = blank;
}
P.Type(d.typ);
......@@ -644,7 +696,8 @@ func (P *Printer) Declaration(d *AST.Decl, parenthesized bool) {
if d.val != nil {
P.String(0, "\t");
if d.tok != Scanner.IMPORT {
P.String(0, "= ");
P.String(0, "=");
P.separator = blank;
}
P.Expr(d.val);
}
......@@ -670,7 +723,8 @@ func (P *Printer) Declaration(d *AST.Decl, parenthesized bool) {
// Program
func (P *Printer) Program(p *AST.Program) {
P.String(p.pos, "package ");
P.String(p.pos, "package");
P.separator = blank;
P.Expr(p.ident);
P.newlines = 1;
for i := 0; i < p.decls.Len(); i++ {
......
usr/gri/pretty/test.sh
View file @ 37bdd3c3
......@@ -6,6 +6,7 @@
TMP1=test_tmp1.go
TMP2=test_tmp2.go
TMP3=test_tmp3.go
COUNT=0
count() {
......@@ -21,6 +22,9 @@ count() {
apply1() {
#echo $1 $2
case `basename $F` in
# these files don't pass the idempotency test yet
log.go | decimal.go | type.go | tabwriter_test.go | \
\
selftest1.go | func3.go | bug014.go | bug029.go | bug032.go | bug050.go | \
bug068.go | bug088.go | bug083.go | bug106.go | bug125.go ) ;; # skip - files contain syntax errors
* ) $1 $2; count ;;
......@@ -54,7 +58,7 @@ apply() {
cleanup() {
rm -f $TMP1 $TMP2
rm -f $TMP1 $TMP2 $TMP3
}
......@@ -73,9 +77,10 @@ idempotent() {
cleanup
./pretty $1 > $TMP1
./pretty $TMP1 > $TMP2
cmp -s $TMP1 $TMP2
./pretty $TMP2 > $TMP3
cmp -s $TMP2 $TMP3
if [ $? != 0 ]; then
diff $TMP1 $TMP2
diff $TMP2 $TMP3
echo "Error (idempotency test): test.sh $1"
exit 1
fi
......
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