XML Message basics

mirai-core/src/commonMain/kotlin/net.mamoe.mirai/message/XML.kt

+package net.mamoe.mirai.message
+
+/**
+ * XML 消息, 如分享, 卡片等.
+ *
+ * @see buildXMLMessage
+ */
+inline class XMLMessage(override val stringValue: String) : Message, SingleOnly {
+    override fun followedBy(tail: Message): Nothing = error("XMLMessage Message cannot be followed")
+}
+
+/**
+ * 构造一条 XML 消息
+ */
+@XMLDsl
+inline fun buildXMLMessage(block: @XMLDsl XMLMessageBuilder.() -> Unit): XMLMessage = XMLMessage(XMLMessageBuilder().apply(block).text)
+
+@Suppress("NOTHING_TO_INLINE")
+@XMLDsl
+class ItemBuilder(
+    var bg: Int = 0,
+    var layout: Int = 4
+) {
+    @PublishedApi
+    internal val builder: StringBuilder = StringBuilder()
+    val text: String get() = "<item bg='$bg' layout='$layout'>$builder</item>"
+
+    inline fun summary(text: String, color: String = "#FFFFFF") {
+        this.builder.append("<summary color='$color'>$text</summary>")
+    }
+
+    inline fun title(text: String, size: Int = 18, color: String = "#FFFFFF") {
+        this.builder.append("<title size='$size', color='$color'>$text</title>")
+    }
+
+    inline fun picture(coverUrl: String) {
+        this.builder.append("<picture cover='$coverUrl'/>")
+    }
+}
+
+@XMLDsl
+@Suppress("NOTHING_TO_INLINE")
+class XMLMessageBuilder(
+    var templateId: Int = 1,
+    var serviceId: Int = 1,
+    var action: String = "plugin",
+    /**
+     * 一般为点击这条消息后跳转的链接
+     */
+    var actionData: String = "",
+    /**
+     * 摘要
+     */
+    var brief: String = "",
+    var flag: Int = 3,
+    var url: String = "", // TODO: 2019/12/3 unknown
+    var sourceName: String = "",
+    var sourceIconURL: String = ""
+) {
+    @PublishedApi
+    internal val builder: StringBuilder = StringBuilder()
+
+    val text: String
+        get() = "<?xml version='1.0' encoding='UTF-8' standalone='yes' ?>" +
+                "<msg templateID='$templateId' serviceID='$serviceId' action='$action' actionData='$actionData' brief='$brief' flag='$flag' url='$url'>" +
+                builder.toString() +
+                "<source name='$sourceName' icon='$sourceIconURL'/>" +
+                "</msg>"
+
+    @XMLDsl
+    inline fun item(block: @XMLDsl ItemBuilder.() -> Unit) {
+        builder.append(ItemBuilder().apply(block).text)
+    }
+
+    inline fun source(name: String, iconURL: String = "") {
+        sourceName = name
+        sourceIconURL = iconURL
+    }
+}
+
+@Target(AnnotationTarget.CLASS, AnnotationTarget.FUNCTION, AnnotationTarget.TYPE)
+@DslMarker
+internal annotation class XMLDsl
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