Function computeErrorLocation

eval/error.go:69–109

computeErrorLocation implements a heuristic to find the location in the user code where the error occurred. It walks back the callstack until the file doesn't match "/goa/design/*.go" or one of the DSL package paths. When successful it returns the file name and line number, empty string and 0 otherw

()

// When successful it returns the file name and line number, empty string and
// 0 otherwise.
func computeErrorLocation() (file string, line int) {
	shouldSkip := func(file, name string) bool {
		if strings.HasSuffix(file, "_test.go") { // Be nice with tests
			return false
		}
		if isGoaSourceFile(file) {
			return true
		}
		file = filepath.ToSlash(file)
		normalized := normalizeFileForPackageMatch(file)
		for _, pkg := range Context.dslPackages {
			if strings.Contains(file, pkg) || strings.Contains(normalized, pkg) || strings.Contains(name, pkg) {
				return true
			}
		}
		return false
	}

	// Start scanning just above computeErrorLocation itself. This is robust to
	// inlining and avoids hardcoding assumptions about the exact call depth.
	const skip = 2
	pcs := make([]uintptr, 32)
	n := runtime.Callers(skip, pcs)
	frames := runtime.CallersFrames(pcs[:n])
	for {
		frame, more := frames.Next()
		if frame.File == "" || frame.Line == 0 {
			if !more {
				break
			}
			continue
		}
		if !shouldSkip(frame.File, frame.Function) {
			return relativeToWorkdir(frame.File), frame.Line
		}
		if !more {
			break
		}
	}
	return "", 0
}

// isGoaSourceFile reports whether file points into the Goa module sources.
//