135 lines
4.3 KiB
Markdown
135 lines
4.3 KiB
Markdown
Title: CLD: Context generation
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Date: 2025-03-11 00:00
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Category: News
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Slug: cld_ctx-gen
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Lang: en
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![splash][splash]
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# Context generation
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In February I've updated the **C**ross-**l**anguage **d**ialect (CLD) translator to
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generate Context out of YML. The generated Contexts have already been
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used for the following projects:
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* CLD (the CLD translator generated its own Context)
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* LHA
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* PSKOV
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I never really took time to explain what Context is, so here's
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a very short explanation: Context is very close to
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[Store in Redux][store]. I'm afraid this is not yet the time
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to explain Context in detail because I don't yet have a good
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argument why you need Context. Once that time comes I do it.
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Now let's get back to the Context generation. Here's how LHA's YML for Context looks like: ([entities.yml][entities]):
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```
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# Application state context
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Context:
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type: context
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fields:
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# Command line arguments
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arguments: [String]
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consoleOutput: String
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defaultDir: String
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didLaunch: Bool
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dir: String
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httpDefaultPort: Int
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httpLaunch: Bool
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httpPort: Int
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httpReply: String
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httpRequest: NetRequest
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```
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CLD translator converts it to the following code in Kotlin ([entities.kt][entities-result]):
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```
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// Application state context
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data class Context(
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// Command line arguments
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var arguments: Array<String> = arrayOf(),
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var consoleOutput: String = "",
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var defaultDir: String = "",
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var didLaunch: Boolean = false,
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var dir: String = "",
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var httpDefaultPort: Int = 0,
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var httpLaunch: Boolean = false,
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var httpPort: Int = 0,
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var httpReply: String = "",
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var httpRequest: NetRequest = NetRequest(),
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override var recentField: String = "",
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): CLDContext {
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override fun <T> field(name: String): T {
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if (name == "arguments") {
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return arguments as T
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} else if (name == "consoleOutput") {
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return consoleOutput as T
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} else if (name == "defaultDir") {
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return defaultDir as T
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} else if (name == "didLaunch") {
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return didLaunch as T
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} else if (name == "dir") {
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return dir as T
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} else if (name == "httpDefaultPort") {
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return httpDefaultPort as T
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} else if (name == "httpLaunch") {
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return httpLaunch as T
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} else if (name == "httpPort") {
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return httpPort as T
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} else if (name == "httpReply") {
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return httpReply as T
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} else if (name == "httpRequest") {
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return httpRequest as T
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}
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return "unknown-field-name" as T
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}
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override fun selfCopy(): CLDContext {
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return this.copy()
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}
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override fun setField(
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name: String,
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value: Any?
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) {
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if (name == "arguments") {
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arguments = value as Array<String>
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} else if (name == "consoleOutput") {
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consoleOutput = value as String
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} else if (name == "defaultDir") {
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defaultDir = value as String
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} else if (name == "didLaunch") {
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didLaunch = value as Boolean
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} else if (name == "dir") {
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dir = value as String
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} else if (name == "httpDefaultPort") {
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httpDefaultPort = value as Int
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} else if (name == "httpLaunch") {
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httpLaunch = value as Boolean
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} else if (name == "httpPort") {
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httpPort = value as Int
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} else if (name == "httpReply") {
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httpReply = value as String
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} else if (name == "httpRequest") {
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httpRequest = value as NetRequest
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}
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}
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}
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```
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# March
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Kotlin is currently the anchor programming language of CLD. Thus, to use Kotlin,
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one would have to install related Java tools (Gradle, Android Studio or JVM itself).
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Such a requirement makes it impossible to have a web browser only development
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tool. And being able to code in a web browser is something I consider the
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key feature for code portability.
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That's why in March I plan to create the draft of a tool running in a web browser.
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[entities]: https://github.com/OGStudio/local-host-access/blob/main/cld/entities.yml
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[entities-result]: https://github.com/OGStudio/local-host-access/blob/main/src/entities.kt#L3
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[splash]: ../../images/2025-03_redux-data-flow.jpg
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[store]: https://redux.js.org/introduction/getting-started#basic-example
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