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// 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 (
"vector";
"utf8";
"fmt";
"os";
Utils "utils";
Platform "platform";
Scanner "scanner";
Parser "parser";
AST "ast";
TypeChecker "typechecker";
)
func assert(b bool) {
if !b {
panic("assertion failed");
}
}
type Flags struct {
Verbose bool;
Deps bool;
Columns bool;
}
type errorHandler struct {
filename string;
src []byte;
nerrors int;
nwarnings int;
errpos int;
columns bool;
}
func (h *errorHandler) Init(filename string, src []byte, columns bool) {
h.filename = filename;
h.src = src;
h.nerrors = 0;
h.nwarnings = 0;
h.errpos = 0;
h.columns = columns;
}
// Compute (line, column) information for a given source position.
func (h *errorHandler) LineCol(pos int) (line, col int) {
line = 1;
lpos := 0;
src := h.src;
if pos > len(src) {
pos = len(src);
}
for i := 0; i < pos; i++ {
if src[i] == '\n' {
line++;
lpos = i;
}
}
return line, utf8.RuneCount(src[lpos : pos]);
}
func (h *errorHandler) ErrorMsg(pos int, msg string) {
print(h.filename, ":");
if pos >= 0 {
// print position
line, col := h.LineCol(pos);
print(line, ":");
if h.columns {
print(col, ":");
}
}
print(" ", msg, "\n");
h.nerrors++;
h.errpos = pos;
if h.nerrors >= 10 {
sys.Exit(1);
}
}
func (h *errorHandler) Error(pos int, msg string) {
// only report errors that are sufficiently far away from the previous error
// in the hope to avoid most follow-up errors
const errdist = 20;
delta := pos - h.errpos; // may be negative!
if delta < 0 {
delta = -delta;
}
if delta > errdist || h.nerrors == 0 /* always report first error */ {
h.ErrorMsg(pos, msg);
}
}
func Compile(src_file string, flags *Flags) (*AST.Program, int) {
src, ok := Platform.ReadSourceFile(src_file);
if !ok {
print("cannot open ", src_file, "\n");
return nil, 1;
}
var err errorHandler;
err.Init(src_file, src, flags.Columns);
var scanner Scanner.Scanner;
scanner.Init(src, &err, true);
var parser Parser.Parser;
parser.Open(&scanner, &err, flags.Verbose);
prog := parser.ParseProgram();
if err.nerrors == 0 {
TypeChecker.CheckProgram(&err, prog);
}
return prog, err.nerrors;
}
func fileExists(name string) bool {
fd, err := os.Open(name, os.O_RDONLY, 0);
defer fd.Close();
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, nerrors := Compile(src_file, flags);
if nerrors > 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);
}
}
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