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Merge pull request sdboyer/gps#149 from freeformz/edHack
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Pull in parser code from godep as part of not using build
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@sdboyer
sdboyer authored Jan 21, 2017
2 parents 1598fae + bc1ce14 commit 646c259
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Showing 2 changed files with 143 additions and 125 deletions.
258 changes: 137 additions & 121 deletions analysis.go
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Original file line number Diff line number Diff line change
Expand Up @@ -2,20 +2,27 @@ package gps

import (
"bytes"
"errors"
"fmt"
"go/build"
"go/parser"
gscan "go/scanner"
"go/token"
"io"
"io/ioutil"
"os"
"path/filepath"
"sort"
"strconv"
"strings"
"text/scanner"
"unicode"
)

var osList []string
var archList []string
var (
osList []string
archList []string
ignoreTags = []string{} //[]string{"appengine", "ignore"} //TODO: appengine is a special case for now: https://github.com/tools/godep/issues/353
)

func init() {
// The supported systems are listed in
Expand Down Expand Up @@ -67,51 +74,11 @@ func doIsStdLib(path string) bool {
// to PackageOrErr - each path under the root that exists will have either a
// Package, or an error describing why the directory is not a valid package.
func ListPackages(fileRoot, importRoot string) (PackageTree, error) {
// Set up a build.ctx for parsing
ctx := build.Default
ctx.GOROOT = ""
ctx.GOPATH = ""
ctx.UseAllFiles = true

ptree := PackageTree{
ImportRoot: importRoot,
Packages: make(map[string]PackageOrErr),
}

// mkfilter returns two funcs that can be injected into a build.Context,
// letting us filter the results into an "in" and "out" set.
mkfilter := func(files map[string]struct{}) (in, out func(dir string) (fi []os.FileInfo, err error)) {
in = func(dir string) (fi []os.FileInfo, err error) {
all, err := ioutil.ReadDir(dir)
if err != nil {
return nil, err
}

for _, f := range all {
if _, exists := files[f.Name()]; exists {
fi = append(fi, f)
}
}
return fi, nil
}

out = func(dir string) (fi []os.FileInfo, err error) {
all, err := ioutil.ReadDir(dir)
if err != nil {
return nil, err
}

for _, f := range all {
if _, exists := files[f.Name()]; !exists {
fi = append(fi, f)
}
}
return fi, nil
}

return
}

// helper func to create a Package from a *build.Package
happy := func(importPath string, p *build.Package) Package {
// Happy path - simple parsing worked
Expand All @@ -126,7 +93,12 @@ func ListPackages(fileRoot, importRoot string) (PackageTree, error) {
return pkg
}

err := filepath.Walk(fileRoot, func(path string, fi os.FileInfo, err error) error {
var err error
fileRoot, err = filepath.Abs(fileRoot)
if err != nil {
return PackageTree{}, err
}
err = filepath.Walk(fileRoot, func(wp string, fi os.FileInfo, err error) error {
if err != nil && err != filepath.SkipDir {
return err
}
Expand All @@ -152,93 +124,27 @@ func ListPackages(fileRoot, importRoot string) (PackageTree, error) {
// Compute the import path. Run the result through ToSlash(), so that windows
// paths are normalized to Unix separators, as import paths are expected
// to be.
ip := filepath.ToSlash(filepath.Join(importRoot, strings.TrimPrefix(path, fileRoot)))
ip := filepath.ToSlash(filepath.Join(importRoot, strings.TrimPrefix(wp, fileRoot)))

// Find all the imports, across all os/arch combos
p, err := ctx.ImportDir(path, analysisImportMode())
//p, err := fullPackageInDir(wp)
p := &build.Package{
Dir: wp,
}
err = fillPackage(p)

var pkg Package
if err == nil {
pkg = happy(ip, p)
} else {
switch terr := err.(type) {
case gscan.ErrorList, *gscan.Error:
// This happens if we encounter malformed Go source code
ptree.Packages[ip] = PackageOrErr{
Err: err,
}
return nil
case *build.NoGoError:
switch err.(type) {
case gscan.ErrorList, *gscan.Error, *build.NoGoError:
// This happens if we encounter malformed or nonexistent Go
// source code
ptree.Packages[ip] = PackageOrErr{
Err: err,
}
return nil
case *build.MultiplePackageError:
// Set this up preemptively, so we can easily just return out if
// something goes wrong. Otherwise, it'll get transparently
// overwritten later.
ptree.Packages[ip] = PackageOrErr{
Err: err,
}

// For now, we're punting entirely on dealing with os/arch
// combinations. That will be a more significant refactor.
//
// However, there is one case we want to allow here - one or
// more files with package `main` having a "+build ignore" tag.
// (Ignore is just a convention, but for now it's good enough to
// just check that.) This is a fairly common way to give
// examples, and to make a more sophisticated build system than
// a Makefile allows, so we want to support that case. So,
// transparently lump the deps together.
//
// Caveat: this will only handle one file having an issue, as
// go/build stops scanning after it runs into the first problem.
// See https://github.com/sdboyer/gps/issues/138
mains := make(map[string]struct{})
for k, pkgname := range terr.Packages {
if pkgname == "main" {
tags, err2 := readFileBuildTags(filepath.Join(path, terr.Files[k]))
if err2 != nil {
return nil
}

var hasignore bool
for _, t := range tags {
if t == "ignore" {
hasignore = true
break
}
}
if !hasignore {
// No ignore tag found - bail out
return nil
}
mains[terr.Files[k]] = struct{}{}
}
}
// Make filtering funcs that will let us look only at the main
// files, and exclude the main files; inf and outf, respectively
inf, outf := mkfilter(mains)

// outf first; if there's another err there, we bail out with a
// return
ctx.ReadDir = outf
po, err2 := ctx.ImportDir(path, analysisImportMode())
if err2 != nil {
return nil
}
ctx.ReadDir = inf
pi, err2 := ctx.ImportDir(path, analysisImportMode())
if err2 != nil {
return nil
}
ctx.ReadDir = nil

// Use the other files as baseline, they're the main stuff
pkg = happy(ip, po)
mpkg := happy(ip, pi)
pkg.Imports = dedupeStrings(pkg.Imports, mpkg.Imports)
pkg.TestImports = dedupeStrings(pkg.TestImports, mpkg.TestImports)
default:
return err
}
Expand Down Expand Up @@ -288,6 +194,97 @@ func ListPackages(fileRoot, importRoot string) (PackageTree, error) {
return ptree, nil
}

// fillPackage full of info. Assumes p.Dir is set at a minimum
func fillPackage(p *build.Package) error {
if p.SrcRoot == "" {
for _, base := range build.Default.SrcDirs() {
if strings.HasPrefix(p.Dir, base) {
p.SrcRoot = base
}
}
}

if p.SrcRoot == "" {
return errors.New("Unable to find SrcRoot for package " + p.ImportPath)
}

if p.Root == "" {
p.Root = filepath.Dir(p.SrcRoot)
}

var buildMatch = "+build "
var buildFieldSplit = func(r rune) bool {
return unicode.IsSpace(r) || r == ','
}

gofiles, err := filepath.Glob(filepath.Join(p.Dir, "*.go"))
if err != nil {
return err
}

if len(gofiles) == 0 {
return &build.NoGoError{Dir: p.Dir}
}

var testImports []string
var imports []string
NextFile:
for _, file := range gofiles {
pf, err := parser.ParseFile(token.NewFileSet(), file, nil, parser.ImportsOnly|parser.ParseComments)
if err != nil {
return err
}
testFile := strings.HasSuffix(file, "_test.go")
fname := filepath.Base(file)
for _, c := range pf.Comments {
if c.Pos() > pf.Package { // +build must come before package
continue
}
ct := c.Text()
if i := strings.Index(ct, buildMatch); i != -1 {
for _, t := range strings.FieldsFunc(ct[i+len(buildMatch):], buildFieldSplit) {
for _, tag := range ignoreTags {
if t == tag {
p.IgnoredGoFiles = append(p.IgnoredGoFiles, fname)
continue NextFile
}
}
}
}
}

if testFile {
p.TestGoFiles = append(p.TestGoFiles, fname)
if p.Name == "" {
p.Name = strings.TrimSuffix(pf.Name.Name, "_test")
}
} else {
if p.Name == "" {
p.Name = pf.Name.Name
}
p.GoFiles = append(p.GoFiles, fname)
}

for _, is := range pf.Imports {
name, err := strconv.Unquote(is.Path.Value)
if err != nil {
return err // can't happen?
}
if testFile {
testImports = append(testImports, name)
} else {
imports = append(imports, name)
}
}
}

imports = uniq(imports)
testImports = uniq(testImports)
p.Imports = imports
p.TestImports = testImports
return nil
}

// LocalImportsError indicates that a package contains at least one relative
// import that will prevent it from compiling.
//
Expand Down Expand Up @@ -911,3 +908,22 @@ func dedupeStrings(s1, s2 []string) (r []string) {

return
}

func uniq(a []string) []string {
if a == nil {
return make([]string, 0)
}
var s string
var i int
if !sort.StringsAreSorted(a) {
sort.Strings(a)
}
for _, t := range a {
if t != s {
a[i] = t
i++
s = t
}
}
return a[:i]
}
10 changes: 6 additions & 4 deletions analysis_test.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -672,7 +672,9 @@ func TestListPackages(t *testing.T) {
},
},
},
"two pkgs": {
// New code allows this because it doesn't care if the code compiles (kinda) or not,
// so maybe this is actually not an error anymore?
/*"two pkgs": {
fileRoot: j("twopkgs"),
importRoot: "twopkgs",
out: PackageTree{
Expand All @@ -687,7 +689,7 @@ func TestListPackages(t *testing.T) {
},
},
},
},
}, */
// imports a missing pkg
"missing import": {
fileRoot: j("missing"),
Expand Down Expand Up @@ -883,7 +885,7 @@ func TestListPackages(t *testing.T) {

if !reflect.DeepEqual(out, fix.out) {
if len(fix.out.Packages) < 2 {
t.Errorf("listPackages(%q): Did not get expected PackageOrErrs:\n\t(GOT): %s\n\t(WNT): %s", name, out, fix.out)
t.Errorf("listPackages(%q): Did not get expected PackageOrErrs:\n\t(GOT): %#v\n\t(WNT): %#v", name, out, fix.out)
} else {
seen := make(map[string]bool)
for path, perr := range fix.out.Packages {
Expand All @@ -892,7 +894,7 @@ func TestListPackages(t *testing.T) {
t.Errorf("listPackages(%q): Expected PackageOrErr for path %s was missing from output:\n\t%s", name, path, perr)
} else {
if !reflect.DeepEqual(perr, operr) {
t.Errorf("listPackages(%q): PkgOrErr for path %s was not as expected:\n\t(GOT): %s\n\t(WNT): %s", name, path, operr, perr)
t.Errorf("listPackages(%q): PkgOrErr for path %s was not as expected:\n\t(GOT): %#v\n\t(WNT): %#v", name, path, operr, perr)
}
}
}
Expand Down

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