🔀 Merge next

[Sone.git] / src / main / kotlin / net / pterodactylus / sone / freenet / L10nFilter.kt

diff --git a/src/main/kotlin/net/pterodactylus/sone/freenet/L10nFilter.kt b/src/main/kotlin/net/pterodactylus/sone/freenet/L10nFilter.kt
new file mode 100644 (file)
index 0000000..b48bfec
--- /dev/null
+++ b/src/main/kotlin/net/pterodactylus/sone/freenet/L10nFilter.kt
@@ -0,0 +1,51 @@
+/*
+ * Sone - L10nFilter.java - Copyright © 2010–2019 David Roden
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package net.pterodactylus.sone.freenet
+
+import net.pterodactylus.util.template.*
+import java.text.*
+
+/**
+ * [Filter] implementation replaces [String] values with their
+ * translated equivalents.
+ */
+class L10nFilter(private val translation: Translation) : Filter {
+
+       override fun format(templateContext: TemplateContext?, data: Any?, parameters: Map<String, Any>?): String {
+               val parameterValues = getParameters(data, parameters)
+               val text = getText(data)
+               return if (parameterValues.isEmpty()) {
+                       translation.translate(text)
+               } else
+                       MessageFormat(translation.translate(text), translation.currentLocale).format(parameterValues.toTypedArray())
+       }
+
+       private fun getText(data: Any?) = (data as? L10nText)?.text ?: data.toString()
+
+       private fun getParameters(data: Any?, parameters: Map<String, Any>?) =
+                       if (data is L10nText)
+                               data.parameters
+                       else
+                               (parameters ?: emptyMap()).let { params ->
+                                       generateSequence(0) { it + 1 }
+                                                       .takeWhile { it.toString() in params }
+                                                       .map { params[it.toString()] }
+                                                       .toList()
+                               }
+
+}