// Parse parses rules expressions
func (r *Rules) Parse(expression string) (*mux.Route, error) {
var resultRoute *mux.Route
err := r.parseRules(expression, func(functionName string, function interface{}, arguments []string) error {
inputs := make([]reflect.Value, len(arguments))
for i := range arguments {
inputs[i] = reflect.ValueOf(arguments[i])
}
method := reflect.ValueOf(function)
if method.IsValid() {
resultRoute = method.Call(inputs)[0].Interface().(*mux.Route)
if r.err != nil {
return r.err
}
if resultRoute.GetError() != nil {
return resultRoute.GetError()
}
} else {
return errors.New("Method not found: '" + functionName + "'")
}
return nil
})
if err != nil {
return nil, fmt.Errorf("Error parsing rule: %v", err)
}
return resultRoute, nil
}
// Parse parses rules expressions
func (r *Rules) Parse(expression string) (*mux.Route, error) {
functions := map[string]interface{}{
"Host": r.host,
"HostRegexp": r.hostRegexp,
"Path": r.path,
"PathStrip": r.pathStrip,
"PathPrefix": r.pathPrefix,
"PathPrefixStrip": r.pathPrefixStrip,
"Method": r.methods,
"Headers": r.headers,
"HeadersRegexp": r.headersRegexp,
}
f := func(c rune) bool {
return c == ':'
}
// Allow multiple rules separated by ;
splitRule := func(c rune) bool {
return c == ';'
}
parsedRules := strings.FieldsFunc(expression, splitRule)
var resultRoute *mux.Route
for _, rule := range parsedRules {
// get function
parsedFunctions := strings.FieldsFunc(rule, f)
if len(parsedFunctions) == 0 {
return nil, errors.New("Error parsing rule: " + rule)
}
parsedFunction, ok := functions[parsedFunctions[0]]
if !ok {
return nil, errors.New("Error parsing rule: " + rule + ". Unknown function: " + parsedFunctions[0])
}
parsedFunctions = append(parsedFunctions[:0], parsedFunctions[1:]...)
fargs := func(c rune) bool {
return c == ','
}
// get function
parsedArgs := strings.FieldsFunc(strings.Join(parsedFunctions, ":"), fargs)
if len(parsedArgs) == 0 {
return nil, errors.New("Error parsing args from rule: " + rule)
}
inputs := make([]reflect.Value, len(parsedArgs))
for i := range parsedArgs {
inputs[i] = reflect.ValueOf(parsedArgs[i])
}
method := reflect.ValueOf(parsedFunction)
if method.IsValid() {
resultRoute = method.Call(inputs)[0].Interface().(*mux.Route)
if r.err != nil {
return nil, r.err
}
if resultRoute.GetError() != nil {
return nil, resultRoute.GetError()
}
} else {
return nil, errors.New("Method not found: " + parsedFunctions[0])
}
}
return resultRoute, nil
}
