func checkAnalysisResults()

in go/tools/builders/nogo_main.go [368:446]
71 lines of code
19 McCabe index (conditional complexity)

func checkAnalysisResults(actions []*action, pkg *goPackage) string {
	type entry struct {
		analysis.Diagnostic
		*analysis.Analyzer
	}
	var diagnostics []entry
	var errs []error
	for _, act := range actions {
		if act.err != nil {
			// Analyzer failed.
			errs = append(errs, fmt.Errorf("analyzer %q failed: %v", act.a.Name, act.err))
			continue
		}
		if len(act.diagnostics) == 0 {
			continue
		}
		config, ok := configs[act.a.Name]
		if !ok {
			// If the analyzer is not explicitly configured, it emits diagnostics for
			// all files.
			for _, diag := range act.diagnostics {
				diagnostics = append(diagnostics, entry{Diagnostic: diag, Analyzer: act.a})
			}
			continue
		}
		// Discard diagnostics based on the analyzer configuration.
		for _, d := range act.diagnostics {
			// NOTE(golang.org/issue/31008): nilness does not set positions,
			// so don't assume the position is valid.
			p := pkg.fset.Position(d.Pos)
			filename := "-"
			if p.IsValid() {
				filename = p.Filename
			}
			include := true
			if len(config.onlyFiles) > 0 {
				// This analyzer emits diagnostics for only a set of files.
				include = false
				for _, pattern := range config.onlyFiles {
					if pattern.MatchString(filename) {
						include = true
						break
					}
				}
			}
			if include {
				for _, pattern := range config.excludeFiles {
					if pattern.MatchString(filename) {
						include = false
						break
					}
				}
			}
			if include {
				diagnostics = append(diagnostics, entry{Diagnostic: d, Analyzer: act.a})
			}
		}
	}
	if len(diagnostics) == 0 && len(errs) == 0 {
		return ""
	}

	sort.Slice(diagnostics, func(i, j int) bool {
		return diagnostics[i].Pos < diagnostics[j].Pos
	})
	errMsg := &bytes.Buffer{}
	sep := ""
	for _, err := range errs {
		errMsg.WriteString(sep)
		sep = "\n"
		errMsg.WriteString(err.Error())
	}
	for _, d := range diagnostics {
		errMsg.WriteString(sep)
		sep = "\n"
		fmt.Fprintf(errMsg, "%s: %s (%s)", pkg.fset.Position(d.Pos), d.Message, d.Name)
	}
	return errMsg.String()
}