Golang PathEnclosingInterval Examples

Example #1

File: quickfix.go Project: Pinkxa/gophernotes

func (c Config) QuickFixOnce() (bool, error) {
	fset := c.Fset
	files := c.Files

	errs := []error{}
	config := &types.Config{
		Error: func(err error) {
			errs = append(errs, err)
		},
	}

	_, err := config.Check("_quickfix", fset, files, c.TypeInfo)
	if err == nil {
		return false, nil
	}

	// apply fixes on AST later so that we won't break funcs that inspect AST by positions
	fixes := map[error]func() bool{}
	unhandled := ErrorList{}

	foundError := len(errs) > 0

	for _, err := range errs {
		err, ok := err.(types.Error)
		if !ok {
			unhandled = append(unhandled, err)
			continue
		}

		f := findFile(c.Files, err.Pos)
		if f == nil {
			e := ErrCouldNotLocate{
				Err:  err,
				Fset: fset,
			}
			unhandled = append(unhandled, e)
			continue
		}

		nodepath, _ := astutil.PathEnclosingInterval(f, err.Pos, err.Pos)

		var fix func() bool

		// - "%s declared but not used"
		// - "%q imported but not used" (+ " as %s")
		// - "label %s declared but not used" TODO
		// - "no new variables on left side of :="
		if m := declaredNotUsed.FindStringSubmatch(err.Msg); m != nil {
			identName := m[1]
			fix = func() bool {
				return fixDeclaredNotUsed(nodepath, identName)
			}
		} else if m := importedNotUsed.FindStringSubmatch(err.Msg); m != nil {
			pkgPath := m[1] // quoted string, but it's okay because this will be compared to ast.BasicLit.Value.
			fix = func() bool {
				return fixImportedNotUsed(nodepath, pkgPath)
			}
		} else if err.Msg == noNewVariablesOnDefine {
			fix = func() bool {
				return fixNoNewVariables(nodepath)
			}
		} else {
			unhandled = append(unhandled, err)
		}

		if fix != nil {
			fixes[err] = fix
		}
	}

	for err, fix := range fixes {
		if fix() == false {
			unhandled = append(unhandled, err)
		}
	}

	return foundError, unhandled.any()
}

Example #2

File: quickfix.go Project: Pinkxa/gophernotes

// doQuickFix tries to fix the source AST so that it compiles well.
func (s *Session) doQuickFix() error {
	const maxAttempts = 10

	s.reset()

quickFixAttempt:
	for i := 0; i < maxAttempts; i++ {
		s.TypeInfo = types.Info{
			Types: make(map[ast.Expr]types.TypeAndValue),
		}

		files := s.ExtraFiles
		files = append(files, s.File)

		config := quickfix.Config{
			Fset:     s.Fset,
			Files:    files,
			TypeInfo: &s.TypeInfo,
		}
		_, err := config.QuickFixOnce()
		if err == nil {
			break
		}

		debugf("quickFix :: err = %#v", err)

		errList, ok := err.(quickfix.ErrorList)
		if !ok {
			continue
		}

		// (try to) fix gore-specific remaining errors
		for _, err := range errList {
			err, ok := err.(types.Error)
			if !ok {
				continue
			}

			// "... used as value":
			//
			// convert
			//   __gore_pp(funcWithSideEffectReturningNoValue())
			// to
			//   funcWithSideEffectReturningNoValue()
			if strings.HasSuffix(err.Msg, " used as value") {
				nodepath, _ := astutil.PathEnclosingInterval(s.File, err.Pos, err.Pos)

				for _, node := range nodepath {
					stmt, ok := node.(ast.Stmt)
					if !ok {
						continue
					}

					for i := range s.mainBody.List {
						if s.mainBody.List[i] != stmt {
							continue
						}

						exprs := printedExprs(stmt)

						stmts := s.mainBody.List[0:i]
						for _, expr := range exprs {
							stmts = append(stmts, &ast.ExprStmt{expr})
						}

						s.mainBody.List = append(stmts, s.mainBody.List[i+1:]...)
						continue quickFixAttempt
					}
				}
			}
		}

		debugf("quickFix :: give up: %#v", err)
	}

	return nil
}