/
react_vetter.go
158 lines (128 loc) · 2.81 KB
/
react_vetter.go
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package main
import (
"fmt"
"go/ast"
"go/build"
"go/importer"
"go/parser"
"go/token"
"go/types"
"path"
"sort"
"strings"
)
const (
jsxImportPath = "myitcv.io/react/jsx"
jsxHTML = "HTML"
jsxMarkdown = "Markdown"
jsxHTMLElem = "HTMLElem"
)
type reactVetter struct {
wd string
bpkg *build.Package
pkgs map[string]*ast.Package
info *types.Info
errlist []vetErr
}
func (r *reactVetter) errorf(node ast.Node, format string, args ...interface{}) {
msg := fmt.Sprintf(format, args...)
r.errlist = append(r.errlist, vetErr{
pos: fset.Position(node.Pos()),
msg: msg,
})
}
var fset = token.NewFileSet()
func newReactVetter(bpkg *build.Package, wd string) *reactVetter {
pkgs, err := parser.ParseDir(fset, bpkg.Dir, nil, parser.ParseComments)
if err != nil {
fatalf("could not parse package directory for %v", bpkg.Name)
}
return &reactVetter{
pkgs: pkgs,
bpkg: bpkg,
wd: wd,
}
}
func (r *reactVetter) vetPackages() {
pns := make([]string, 0, len(r.pkgs))
for n := range r.pkgs {
pns = append(pns, n)
}
sort.Strings(pns)
for _, n := range pns {
pkg := r.pkgs[n]
files := make([]*ast.File, 0, len(pkg.Files))
var jsxFiles []*jsxWalker
for _, f := range pkg.Files {
files = append(files, f)
for _, i := range f.Imports {
if strings.Trim(i.Path.Value, "\"") == jsxImportPath {
name := path.Base(jsxImportPath)
if i.Name != nil && i.Name.Name != "_" {
name = i.Name.Name
}
jsxFiles = append(jsxFiles, &jsxWalker{
reactVetter: r,
f: f,
name: name,
})
}
}
}
// TODO this logic will certainly need to be relaxed if we add more vet rules
if len(jsxFiles) == 0 {
continue
}
conf := types.Config{
Importer: importer.Default(),
}
info := &types.Info{
Defs: make(map[*ast.Ident]types.Object),
Types: make(map[ast.Expr]types.TypeAndValue),
Uses: make(map[*ast.Ident]types.Object),
}
_, err := conf.Check(r.bpkg.ImportPath, fset, files, info)
if err != nil {
fatalf("type checking failed, %v", err)
}
r.info = info
for _, j := range jsxFiles {
ast.Walk(j, j.f)
}
}
}
type jsxWalker struct {
*reactVetter
f *ast.File
name string
}
func (j *jsxWalker) Visit(n ast.Node) ast.Visitor {
switch n := n.(type) {
case *ast.CallExpr:
se, ok := n.Fun.(*ast.SelectorExpr)
if !ok {
break
}
i, ok := se.X.(*ast.Ident)
if !ok {
break
}
if i.Name != j.name {
break
}
switch se.Sel.Name {
case jsxHTML, jsxHTMLElem, jsxMarkdown:
default:
fatalf("unknown jsx package method %v", se.Sel.Name)
}
if v := len(n.Args); v != 1 {
fatalf("expected 1 arg; got %v", v)
}
a := n.Args[0]
tv, ok := j.info.Types[a]
if !ok || tv.Type != types.Typ[types.String] || tv.Value == nil {
j.errorf(a, "argument must be a constant string")
}
}
return j
}