98 lines
2.9 KiB
Go
98 lines
2.9 KiB
Go
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// Copyright (c) 2018 Ernest Micklei
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//
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// MIT License
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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package proto
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// Handler is a type of function that accepts a Visitee.
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type Handler func(v Visitee)
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// Walk recursively pays a visit to all Visitees of a Proto and calls each handler with it.
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func Walk(proto *Proto, handlers ...Handler) {
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walk(proto, handlers...)
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}
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func walk(container elementContainer, handlers ...Handler) {
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for _, eachElement := range container.elements() {
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for _, eachFilter := range handlers {
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eachFilter(eachElement)
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}
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if next, ok := eachElement.(elementContainer); ok {
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walk(next, handlers...)
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}
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}
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}
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// WithMessage returns a Handler that will call the apply function when the Visitee is a Message.
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func WithMessage(apply func(*Message)) Handler {
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return func(v Visitee) {
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if s, ok := v.(*Message); ok {
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apply(s)
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}
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}
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}
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// WithOption returns a Handler that will call the apply function when the Visitee is a Option.
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func WithOption(apply func(*Option)) Handler {
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return func(v Visitee) {
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if s, ok := v.(*Option); ok {
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apply(s)
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}
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}
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}
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// WithEnum returns a Handler that will call the apply function when the Visitee is a Enum.
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func WithEnum(apply func(*Enum)) Handler {
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return func(v Visitee) {
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if s, ok := v.(*Enum); ok {
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apply(s)
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}
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}
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}
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// WithOneof returns a Handler that will call the apply function when the Visitee is a Oneof.
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func WithOneof(apply func(*Oneof)) Handler {
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return func(v Visitee) {
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if s, ok := v.(*Oneof); ok {
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apply(s)
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}
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}
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}
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// WithService returns a Handler that will call the apply function when the Visitee is a Service.
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func WithService(apply func(*Service)) Handler {
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return func(v Visitee) {
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if s, ok := v.(*Service); ok {
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apply(s)
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}
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}
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}
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// WithRPC returns a Handler that will call the apply function when the Visitee is a RPC.
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func WithRPC(apply func(*RPC)) Handler {
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return func(v Visitee) {
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if s, ok := v.(*RPC); ok {
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apply(s)
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}
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}
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}
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