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- some factoring of scan/parse phase so we can attach other functionality

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easily (for instance import dependency extraction)
- support for new "..." syntax
- minor cleanup

R=r
OCL=17811
CL=17811
This commit is contained in:
Robert Griesemer 2008-10-24 14:04:54 -07:00
parent 2bfa95741f
commit cec64a2dd5
5 changed files with 70 additions and 50 deletions
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4
usr/gri/pretty/Makefile
View File

@ -17,7 +17,9 @@ install: pretty
clean:
rm -f pretty *.6 *~
pretty.6: parser.6 printer.6 platform.6 scanner.6
pretty.6: printer.6 platform.6 compilation.6
compilation.6: scanner.6 parser.6 ast.6
printer.6: ast.6 scanner.6

13
usr/gri/pretty/Makefile.iant
View File

@ -11,6 +11,7 @@ LDFLAGS = -Wl,-R,/home/iant/go/lib
PRETTY_OBJS = \
ast.o \
pretty.o \
compilation.go \
parser.o \
platform.o \
printer.o \
@ -31,13 +32,19 @@ install: pretty
clean:
rm -f pretty *.o *~
pretty.o: parser.o printer.o platform.o scanner.o flag.o
parser.o: ast.o scanner.o utils.o printer.o
pretty.o: printer.o platform.o compilation.o
compilation.o: scanner.o parser.o ast.o
printer.o: ast.o scanner.o
parser.o: scanner.o utils.o printer.o ast.o
ast.o: scanner.o
scanner.o: utils.o platform.o
ast.o: scanner.o
flag.o: fmt.o
$(GO) -O2 -c -g $(GOROOT)/src/lib/flag.go

55
usr/gri/pretty/parser.go
View File

@ -309,6 +309,9 @@ func (P *Parser) ParseVarDecl(expect_ident bool) *AST.Type {
x := P.ParseIdent();
t = AST.NewType(x.pos, Scanner.IDENT);
t.expr = x;
} else if P.tok == Scanner.ELLIPSIS {
t = AST.NewType(P.pos, Scanner.ELLIPSIS);
P.Next();
} else {
t = P.ParseType();
}
@ -316,26 +319,32 @@ func (P *Parser) ParseVarDecl(expect_ident bool) *AST.Type {
}
func (P *Parser) ParseVarDeclList(list *AST.List) {
func (P *Parser) ParseVarDeclList(list *AST.List, ellipsis_ok bool) {
P.Trace("VarDeclList");
// parse a list of types
i0 := list.len();
list.Add(P.ParseVarDecl(i0 > 0));
for P.tok == Scanner.COMMA {
P.Next();
for {
list.Add(P.ParseVarDecl(i0 > 0));
if P.tok == Scanner.COMMA {
P.Next();
} else {
break;
}
}
var typ *AST.Type;
if i0 > 0 {
typ := P.TryType();
if typ == nil && P.tok == Scanner.ELLIPSIS {
typ = AST.NewType(P.pos, Scanner.ELLIPSIS);
P.Next();
}
if i0 > 0 && typ == nil {
// not the first parameter section; we must have a type
typ = P.ParseType();
} else {
// first parameter section; we may have a type
typ = P.TryType();
P.Error(P.pos, "type expected");
typ = AST.BadType;
}
// convert the list into a list of (type) expressions
if typ != nil {
// all list entries must be identifiers
@ -355,7 +364,11 @@ func (P *Parser) ParseVarDeclList(list *AST.List) {
} else {
// all list entries are types
// convert all type entries into type expressions
for i, n := i0, list.len(); i < n; i++ {
if i0 > 0 {
panic("internal parser error");
}
for i, n := 0, list.len(); i < n; i++ {
t := list.at(i).(*AST.Type);
list.set(i, AST.NewTypeExpr(t));
}
@ -369,14 +382,14 @@ func (P *Parser) ParseVarDeclList(list *AST.List) {
}
func (P *Parser) ParseParameterList() *AST.List {
func (P *Parser) ParseParameterList(ellipsis_ok bool) *AST.List {
P.Trace("ParameterList");
list := AST.NewList();
P.ParseVarDeclList(list);
P.ParseVarDeclList(list, ellipsis_ok);
for P.tok == Scanner.COMMA {
P.Next();
P.ParseVarDeclList(list);
P.ParseVarDeclList(list, ellipsis_ok);
}
P.Ecart();
@ -384,13 +397,13 @@ func (P *Parser) ParseParameterList() *AST.List {
}
func (P *Parser) ParseParameters() *AST.Type {
func (P *Parser) ParseParameters(ellipsis_ok bool) *AST.Type {
P.Trace("Parameters");
t := AST.NewType(P.pos, Scanner.STRUCT);
P.Expect(Scanner.LPAREN);
if P.tok != Scanner.RPAREN {
t.list = P.ParseParameterList();
t.list = P.ParseParameterList(ellipsis_ok);
}
P.Expect(Scanner.RPAREN);
@ -420,7 +433,7 @@ func (P *Parser) ParseResult() *AST.Type {
var t *AST.Type;
if P.tok == Scanner.LPAREN {
t = P.ParseParameters();
t = P.ParseParameters(false);
} else {
typ := P.TryType();
if typ != nil {
@ -445,7 +458,7 @@ func (P *Parser) ParseFunctionType() *AST.Type {
P.Trace("FunctionType");
t := AST.NewType(P.pos, Scanner.LPAREN);
t.list = P.ParseParameters().list; // TODO find better solution
t.list = P.ParseParameters(true).list; // TODO find better solution
t.elt = P.ParseResult();
P.Ecart();
@ -509,7 +522,7 @@ func (P *Parser) ParseStructType() *AST.Type {
P.Next();
t.list = AST.NewList();
for P.tok == Scanner.IDENT {
P.ParseVarDeclList(t.list);
P.ParseVarDeclList(t.list, false);
if P.tok != Scanner.RBRACE {
P.Expect(Scanner.SEMICOLON);
}
@ -1423,7 +1436,7 @@ func (P *Parser) ParseFunctionDecl(exported bool) *AST.Decl {
var recv *AST.Type;
if P.tok == Scanner.LPAREN {
pos := P.pos;
recv = P.ParseParameters();
recv = P.ParseParameters(true);
if recv.nfields() != 1 {
P.Error(pos, "must have exactly one receiver");
}

40
usr/gri/pretty/pretty.go
View File

@ -6,18 +6,19 @@ package main
import Flag "flag"
import Platform "platform"
import Scanner "scanner"
import Parser "parser"
import Printer "printer"
import Compilation "compilation"
var (
flags Compilation.Flags;
silent = Flag.Bool("s", false, nil, "silent mode: no pretty print output");
verbose = Flag.Bool("v", false, nil, "verbose mode: trace parsing");
sixg = Flag.Bool("6g", true, nil, "6g compatibility mode");
columns = Flag.Bool("columns", Platform.USER == "gri", nil, "print column info in error messages");
testmode = Flag.Bool("t", false, nil, "test mode: interprets /* ERROR */ and /* SYNC */ comments");
tokenchan = Flag.Bool("token_chan", false, nil, "use token channel for scanner-parser connection");
verbose = Flag.Bool("v", false, &flags.verbose, "verbose mode: trace parsing");
sixg = Flag.Bool("6g", true, &flags.sixg, "6g compatibility mode");
deps = Flag.Bool("d", false, &flags.deps, "print dependency information only");
columns = Flag.Bool("columns", Platform.USER == "gri", &flags.columns, "print column info in error messages");
testmode = Flag.Bool("t", false, &flags.testmode, "test mode: interprets /* ERROR */ and /* SYNC */ comments");
tokenchan = Flag.Bool("token_chan", false, &flags.tokenchan, "use token channel for scanner-parser connection");
)
@ -45,26 +46,21 @@ func main() {
sys.exit(1);
}
scanner := new(Scanner.Scanner);
scanner.Open(src_file, src, columns.BVal(), testmode.BVal());
C := Compilation.Compile(src_file, src, &flags);
var tstream *<-chan *Scanner.Token;
if tokenchan.BVal() {
tstream = scanner.TokenStream();
}
parser := new(Parser.Parser);
parser.Open(verbose.BVal(), sixg.BVal(), scanner, tstream);
prog := parser.ParseProgram();
if scanner.nerrors > 0 {
if C.nerrors > 0 {
sys.exit(1);
}
if flags.deps {
print("deps\n");
panic("UNIMPLEMENTED");
return;
}
if !silent.BVal() && !testmode.BVal() {
if !silent.BVal() && !flags.testmode {
var P Printer.Printer;
(&P).Program(prog);
(&P).Program(C.prog);
}
}
}

8
usr/gri/pretty/printer.go
View File

@ -134,14 +134,13 @@ func (P *Printer) Parameters(pos int, list *AST.List) {
func (P *Printer) Fields(list *AST.List) {
P.OpenScope(" {");
P.OpenScope("{");
var prev int;
for i, n := 0, list.len(); i < n; i++ {
x := list.at(i).(*AST.Expr);
if i > 0 {
if prev == Scanner.TYPE {
P.String(0, ";");
P.newl = 1;
P.semi, P.newl = true, 1;
} else if prev == x.tok {
P.String(0, ", ");
} else {
@ -203,6 +202,9 @@ func (P *Printer) Type(t *AST.Type) {
P.Parameters(0, t.elt.list);
}
case Scanner.ELLIPSIS:
P.String(t.pos, "...");
default:
P.Error(t.pos, t.tok, "type");
}