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Support meta tags in StaticHTMLRenderer (#483)
This PR adds the ability to control `<head>` tags using a new `HTMLTitle` view and `HTMLMeta` view. Taking inspiration from Next.js `<NextHead>`, you can use these views anywhere in your view hierarchy and they will be hoisted to the top `<head>` section of the html.
Use as a view:
```swift
var body: some View {
VStack {
...
HTMLTitle("Hello, Tokamak")
HTMLMeta(charset: "utf-8")
...
}
}
```
Use as a view modifier:
```swift
var body: some View {
VStack {
...
}
.htmlTitle("Hello, Tokamak")
.htmlMeta(charset: "utf-8")
}
```
And the resulting html (no matter where these are used in your view hierarchy):
```html
<html>
<head>
<title>Hello, Tokamak</title>
<meta charset="utf-8">
</head>
<body>
...
</body>
</html>
```- Loading branch information
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,37 @@ | ||
| // Copyright 2022 Tokamak contributors | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
| // | ||
| // Created by Andrew Barba on 5/20/22. | ||
| // | ||
|
|
||
| import TokamakCore | ||
|
|
||
| public struct HTMLTitlePreferenceKey: PreferenceKey { | ||
| public static var defaultValue: String = "" | ||
|
|
||
| public static func reduce(value: inout String, nextValue: () -> String) { | ||
| value = nextValue() | ||
| } | ||
| } | ||
|
|
||
| public struct HTMLMetaPreferenceKey: PreferenceKey { | ||
| public static var defaultValue: [HTMLMeta.MetaTag] = [] | ||
|
|
||
| public static func reduce( | ||
| value: inout [HTMLMeta.MetaTag], | ||
| nextValue: () -> [HTMLMeta.MetaTag] | ||
| ) { | ||
| value += nextValue() | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,83 @@ | ||
| // Copyright 2022 Tokamak contributors | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
| // | ||
| // Created by Andrew Barba on 5/20/22. | ||
| // | ||
|
|
||
| import TokamakCore | ||
|
|
||
| public struct HTMLMeta: View { | ||
| public enum MetaTag: Equatable, Hashable { | ||
| case charset(_ charset: String) | ||
| case name(_ name: String, content: String) | ||
| case property(_ property: String, content: String) | ||
| case httpEquiv(_ httpEquiv: String, content: String) | ||
| } | ||
|
|
||
| var meta: MetaTag | ||
|
|
||
| public init(_ value: MetaTag) { | ||
| meta = value | ||
| } | ||
|
|
||
| public init(charset: String) { | ||
| meta = .charset(charset) | ||
| } | ||
|
|
||
| public init(name: String, content: String) { | ||
| meta = .name(name, content: content) | ||
| } | ||
|
|
||
| public init(property: String, content: String) { | ||
| meta = .property(property, content: content) | ||
| } | ||
|
|
||
| public init(httpEquiv: String, content: String) { | ||
| meta = .httpEquiv(httpEquiv, content: content) | ||
| } | ||
|
|
||
| public var body: some View { | ||
| EmptyView() | ||
| .preference(key: HTMLMetaPreferenceKey.self, value: [meta]) | ||
| } | ||
| } | ||
|
|
||
| public extension View { | ||
| func htmlMeta(_ value: HTMLMeta.MetaTag) -> some View { | ||
| htmlMeta(.init(value)) | ||
| } | ||
|
|
||
| func htmlMeta(charset: String) -> some View { | ||
| htmlMeta(.init(charset: charset)) | ||
| } | ||
|
|
||
| func htmlMeta(name: String, content: String) -> some View { | ||
| htmlMeta(.init(name: name, content: content)) | ||
| } | ||
|
|
||
| func htmlMeta(property: String, content: String) -> some View { | ||
| htmlMeta(.init(property: property, content: content)) | ||
| } | ||
|
|
||
| func htmlMeta(httpEquiv: String, content: String) -> some View { | ||
| htmlMeta(.init(httpEquiv: httpEquiv, content: content)) | ||
| } | ||
|
|
||
| func htmlMeta(_ meta: HTMLMeta) -> some View { | ||
| Group { | ||
| self | ||
| meta | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,44 @@ | ||
| // Copyright 2022 Tokamak contributors | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
| // | ||
| // Created by Andrew Barba on 5/20/22. | ||
| // | ||
|
|
||
| import TokamakCore | ||
|
|
||
| public struct HTMLTitle: View { | ||
| var title: String | ||
|
|
||
| public init(_ title: String) { | ||
| self.title = title | ||
| } | ||
|
|
||
| public var body: some View { | ||
| EmptyView() | ||
| .preference(key: HTMLTitlePreferenceKey.self, value: title) | ||
| } | ||
| } | ||
|
|
||
| public extension View { | ||
| func htmlTitle(_ title: String) -> some View { | ||
| htmlTitle(.init(title)) | ||
| } | ||
|
|
||
| func htmlTitle(_ title: HTMLTitle) -> some View { | ||
| Group { | ||
| self | ||
| title | ||
| } | ||
| } | ||
| } |
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