func()

in modfile/rule.go [302:460]

• 139 lines of code
• 28 McCabe index (conditional complexity)

func (f *File) add(errs *ErrorList, block *LineBlock, line *Line, verb string, args []string, fix VersionFixer, strict bool) {
	// If strict is false, this module is a dependency.
	// We ignore all unknown directives as well as main-module-only
	// directives like replace and exclude. It will work better for
	// forward compatibility if we can depend on modules that have unknown
	// statements (presumed relevant only when acting as the main module)
	// and simply ignore those statements.
	if !strict {
		switch verb {
		case "go", "module", "retract", "require":
			// want these even for dependency go.mods
		default:
			return
		}
	}

	wrapModPathError := func(modPath string, err error) {
		*errs = append(*errs, Error{
			Filename: f.Syntax.Name,
			Pos:      line.Start,
			ModPath:  modPath,
			Verb:     verb,
			Err:      err,
		})
	}
	wrapError := func(err error) {
		*errs = append(*errs, Error{
			Filename: f.Syntax.Name,
			Pos:      line.Start,
			Err:      err,
		})
	}
	errorf := func(format string, args ...interface{}) {
		wrapError(fmt.Errorf(format, args...))
	}

	switch verb {
	default:
		errorf("unknown directive: %s", verb)

	case "go":
		if f.Go != nil {
			errorf("repeated go statement")
			return
		}
		if len(args) != 1 {
			errorf("go directive expects exactly one argument")
			return
		} else if !GoVersionRE.MatchString(args[0]) {
			fixed := false
			if !strict {
				if m := laxGoVersionRE.FindStringSubmatch(args[0]); m != nil {
					args[0] = m[1]
					fixed = true
				}
			}
			if !fixed {
				errorf("invalid go version '%s': must match format 1.23", args[0])
				return
			}
		}

		f.Go = &Go{Syntax: line}
		f.Go.Version = args[0]

	case "module":
		if f.Module != nil {
			errorf("repeated module statement")
			return
		}
		deprecated := parseDeprecation(block, line)
		f.Module = &Module{
			Syntax:     line,
			Deprecated: deprecated,
		}
		if len(args) != 1 {
			errorf("usage: module module/path")
			return
		}
		s, err := parseString(&args[0])
		if err != nil {
			errorf("invalid quoted string: %v", err)
			return
		}
		f.Module.Mod = module.Version{Path: s}

	case "require", "exclude":
		if len(args) != 2 {
			errorf("usage: %s module/path v1.2.3", verb)
			return
		}
		s, err := parseString(&args[0])
		if err != nil {
			errorf("invalid quoted string: %v", err)
			return
		}
		v, err := parseVersion(verb, s, &args[1], fix)
		if err != nil {
			wrapError(err)
			return
		}
		pathMajor, err := modulePathMajor(s)
		if err != nil {
			wrapError(err)
			return
		}
		if err := module.CheckPathMajor(v, pathMajor); err != nil {
			wrapModPathError(s, err)
			return
		}
		if verb == "require" {
			f.Require = append(f.Require, &Require{
				Mod:      module.Version{Path: s, Version: v},
				Syntax:   line,
				Indirect: isIndirect(line),
			})
		} else {
			f.Exclude = append(f.Exclude, &Exclude{
				Mod:    module.Version{Path: s, Version: v},
				Syntax: line,
			})
		}

	case "replace":
		replace, wrappederr := parseReplace(f.Syntax.Name, line, verb, args, fix)
		if wrappederr != nil {
			*errs = append(*errs, *wrappederr)
			return
		}
		f.Replace = append(f.Replace, replace)

	case "retract":
		rationale := parseDirectiveComment(block, line)
		vi, err := parseVersionInterval(verb, "", &args, dontFixRetract)
		if err != nil {
			if strict {
				wrapError(err)
				return
			} else {
				// Only report errors parsing intervals in the main module. We may
				// support additional syntax in the future, such as open and half-open
				// intervals. Those can't be supported now, because they break the
				// go.mod parser, even in lax mode.
				return
			}
		}
		if len(args) > 0 && strict {
			// In the future, there may be additional information after the version.
			errorf("unexpected token after version: %q", args[0])
			return
		}
		retract := &Retract{
			VersionInterval: vi,
			Rationale:       rationale,
			Syntax:          line,
		}
		f.Retract = append(f.Retract, retract)
	}
}