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- use stringtorune library function for faster rune scanning

Browse Source 
- converted 2 right-recursive parsing functions into iterative versions
- renamed node.go -> ast.go (clearer)

R=r
OCL=17496
CL=17498
This commit is contained in:
Robert Griesemer 2008-10-20 15:03:40 -07:00
parent ef40d9435b
commit 5d0e5a7867
6 changed files with 248 additions and 216 deletions
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6
usr/gri/pretty/Makefile
View File

@ -19,11 +19,11 @@ clean:
pretty.6: parser.6 printer.6 platform.6 scanner.6
printer.6: node.6 scanner.6
printer.6: ast.6 scanner.6
parser.6: scanner.6 utils.6 printer.6 node.6
parser.6: scanner.6 utils.6 printer.6 ast.6
node.6: scanner.6
ast.6: scanner.6
scanner.6: utils.6 platform.6

6
usr/gri/pretty/Makefile.iant
View File

@ -9,7 +9,7 @@ GO = /home/iant/go/bin/gccgo
LDFLAGS = -Wl,-R,/home/iant/go/lib
PRETTY_OBJS = \
node.o \
ast.o \
pretty.o \
parser.o \
platform.o \
@ -33,11 +33,11 @@ clean:
pretty.o: parser.o printer.o platform.o scanner.o flag.o
parser.o: node.o scanner.o utils.o printer.o
parser.o: ast.o scanner.o utils.o printer.o
scanner.o: utils.o platform.o
node.o: scanner.o
ast.o: scanner.o
flag.o: fmt.o
$(GO) -O2 -c -g $(GOROOT)/src/lib/flag.go

2
usr/gri/pretty/node.go → usr/gri/pretty/ast.go
View File

@ -2,7 +2,7 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package Node
package AST
import Scanner "scanner"

370
usr/gri/pretty/parser.go
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File diff suppressed because it is too large Load Diff

56
usr/gri/pretty/printer.go
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@ -5,7 +5,7 @@
package Printer
import Scanner "scanner"
import Node "node"
import AST "ast"
export type Printer struct {
@ -16,7 +16,7 @@ export type Printer struct {
newl int; // pending "\n"'s
// comments
clist *Node.List;
clist *AST.List;
cindex int;
cpos int;
}
@ -30,7 +30,7 @@ func (P *Printer) String(pos int, s string) {
/*
for pos > P.cpos {
// we have a comment
c := P.clist.at(P.cindex).(*Node.Comment);
c := P.clist.at(P.cindex).(*AST.Comment);
if c.text[1] == '/' {
print(" " + c.text);
if P.newl <= 0 {
@ -41,7 +41,7 @@ func (P *Printer) String(pos int, s string) {
}
P.cindex++;
if P.cindex < P.clist.len() {
P.cpos = P.clist.at(P.cindex).(*Node.Comment).pos;
P.cpos = P.clist.at(P.cindex).(*AST.Comment).pos;
} else {
P.cpos = 1000000000; // infinite
}
@ -100,14 +100,14 @@ func (P *Printer) Error(pos int, tok int, msg string) {
// ----------------------------------------------------------------------------
// Types
func (P *Printer) Type(t *Node.Type)
func (P *Printer) Expr(x *Node.Expr)
func (P *Printer) Type(t *AST.Type)
func (P *Printer) Expr(x *AST.Expr)
func (P *Printer) Parameters(pos int, list *Node.List) {
func (P *Printer) Parameters(pos int, list *AST.List) {
P.String(pos, "(");
var prev int;
for i, n := 0, list.len(); i < n; i++ {
x := list.at(i).(*Node.Expr);
x := list.at(i).(*AST.Expr);
if i > 0 {
if prev == x.tok || prev == Scanner.TYPE {
P.String(0, ", ");
@ -122,11 +122,11 @@ func (P *Printer) Parameters(pos int, list *Node.List) {
}
func (P *Printer) Fields(list *Node.List) {
func (P *Printer) Fields(list *AST.List) {
P.OpenScope(" {");
var prev int;
for i, n := 0, list.len(); i < n; i++ {
x := list.at(i).(*Node.Expr);
x := list.at(i).(*AST.Expr);
if i > 0 {
if prev == Scanner.TYPE {
P.String(0, ";");
@ -145,7 +145,7 @@ func (P *Printer) Fields(list *Node.List) {
}
func (P *Printer) Type(t *Node.Type) {
func (P *Printer) Type(t *AST.Type) {
switch t.tok {
case Scanner.IDENT:
P.Expr(t.expr);
@ -174,9 +174,9 @@ func (P *Printer) Type(t *Node.Type) {
case Scanner.CHAN:
var m string;
switch t.mode {
case Node.FULL: m = "chan ";
case Node.RECV: m = "<-chan ";
case Node.SEND: m = "chan <- ";
case AST.FULL: m = "chan ";
case AST.RECV: m = "<-chan ";
case AST.SEND: m = "chan <- ";
}
P.String(t.pos, m);
P.Type(t.elt);
@ -201,9 +201,9 @@ func (P *Printer) Type(t *Node.Type) {
// ----------------------------------------------------------------------------
// Expressions
func (P *Printer) Block(list *Node.List, indent bool);
func (P *Printer) Block(list *AST.List, indent bool);
func (P *Printer) Expr1(x *Node.Expr, prec1 int) {
func (P *Printer) Expr1(x *AST.Expr, prec1 int) {
if x == nil {
return; // empty expression list
}
@ -288,7 +288,7 @@ func (P *Printer) Expr1(x *Node.Expr, prec1 int) {
}
func (P *Printer) Expr(x *Node.Expr) {
func (P *Printer) Expr(x *AST.Expr) {
P.Expr1(x, Scanner.LowestPrec);
}
@ -296,17 +296,17 @@ func (P *Printer) Expr(x *Node.Expr) {
// ----------------------------------------------------------------------------
// Statements
func (P *Printer) Stat(s *Node.Stat)
func (P *Printer) Stat(s *AST.Stat)
func (P *Printer) StatementList(list *Node.List) {
func (P *Printer) StatementList(list *AST.List) {
for i, n := 0, list.len(); i < n; i++ {
P.Stat(list.at(i).(*Node.Stat));
P.Stat(list.at(i).(*AST.Stat));
P.newl = 1;
}
}
func (P *Printer) Block(list *Node.List, indent bool) {
func (P *Printer) Block(list *AST.List, indent bool) {
P.OpenScope("{");
if !indent {
P.indent--;
@ -319,7 +319,7 @@ func (P *Printer) Block(list *Node.List, indent bool) {
}
func (P *Printer) ControlClause(s *Node.Stat) {
func (P *Printer) ControlClause(s *AST.Stat) {
has_post := s.tok == Scanner.FOR && s.post != nil; // post also used by "if"
if s.init == nil && !has_post {
// no semicolons required
@ -351,9 +351,9 @@ func (P *Printer) ControlClause(s *Node.Stat) {
}
func (P *Printer) Declaration(d *Node.Decl, parenthesized bool);
func (P *Printer) Declaration(d *AST.Decl, parenthesized bool);
func (P *Printer) Stat(s *Node.Stat) {
func (P *Printer) Stat(s *AST.Stat) {
switch s.tok {
case Scanner.EXPRSTAT:
// expression statement
@ -432,7 +432,7 @@ func (P *Printer) Stat(s *Node.Stat) {
// Declarations
func (P *Printer) Declaration(d *Node.Decl, parenthesized bool) {
func (P *Printer) Declaration(d *AST.Decl, parenthesized bool) {
if !parenthesized {
if d.exported {
P.String(0, "export ");
@ -444,7 +444,7 @@ func (P *Printer) Declaration(d *Node.Decl, parenthesized bool) {
if d.tok != Scanner.FUNC && d.list != nil {
P.OpenScope("(");
for i := 0; i < d.list.len(); i++ {
P.Declaration(d.list.at(i).(*Node.Decl), true);
P.Declaration(d.list.at(i).(*AST.Decl), true);
P.semi, P.newl = true, 1;
}
P.CloseScope(")");
@ -501,12 +501,12 @@ func (P *Printer) Declaration(d *Node.Decl, parenthesized bool) {
// ----------------------------------------------------------------------------
// Program
func (P *Printer) Program(p *Node.Program) {
func (P *Printer) Program(p *AST.Program) {
// TODO should initialize all fields?
P.clist = p.comments;
P.cindex = 0;
if p.comments.len() > 0 {
P.cpos = p.comments.at(0).(*Node.Comment).pos;
P.cpos = p.comments.at(0).(*AST.Comment).pos;
} else {
P.cpos = 1000000000; // infinite
}

16
usr/gri/pretty/scanner.go
View File

@ -295,6 +295,21 @@ export type Scanner struct {
// Read the next Unicode char into S.ch.
// S.ch < 0 means end-of-file.
func (S *Scanner) Next() {
if S.pos < len(S.src) {
// assume ascii
r, w := int(S.src[S.pos]), 1;
if r > 0x80 {
// wasn't ascii
r, w = sys.stringtorune(S.src, S.pos);
}
S.ch = r;
S.chpos = S.pos;
S.pos += w;
} else {
S.ch = -1; // eof
S.chpos = len(S.src);
}
/*
const (
Bit1 = 7;
Bitx = 6;
@ -389,6 +404,7 @@ bad:
S.chpos = S.pos;
S.pos += 1;
return;
*/
}