feat(util/config): new config parser

Author: WhiredPlanck

app/src/main/java/com/osfans/trime/util/config/Config.kt

@@ -0,0 +1,83 @@
+package com.osfans.trime.util.config
+
+import com.charleskorn.kaml.YamlList
+import com.charleskorn.kaml.YamlMap
+import com.charleskorn.kaml.YamlNode
+import com.charleskorn.kaml.YamlNull
+import com.charleskorn.kaml.YamlScalar
+import com.charleskorn.kaml.yamlList
+import com.charleskorn.kaml.yamlMap
+import com.charleskorn.kaml.yamlScalar
+import timber.log.Timber
+
+/**
+ * New YAML config parser intended to replace the old one.
+ */
+class Config(private val data: ConfigData = ConfigData()) {
+
+    fun loadFromFile(fileName: String) = data.loadFromFile(fileName)
+
+    fun isNull(path: String): Boolean {
+        val p = data.traverse(path)
+        return p == null || p is YamlNull
+    }
+
+    fun isValue(path: String): Boolean {
+        val p = data.traverse(path)
+        return p == null || p is YamlScalar
+    }
+
+    fun isList(path: String): Boolean {
+        val p = data.traverse(path)
+        return p == null || p is YamlList
+    }
+
+    fun isMap(path: String): Boolean {
+        val p = data.traverse(path)
+        return p == null || p is YamlMap
+    }
+
+    fun getBool(path: String, defValue: Boolean = false): Boolean {
+        Timber.d("read: $path")
+        val p = data.traverse(path)?.yamlScalar
+        return p?.toBoolean() ?: defValue
+    }
+
+    fun getInt(path: String, defValue: Int = 0): Int {
+        Timber.d("read: $path")
+        val p = data.traverse(path)?.yamlScalar
+        return p?.toInt() ?: defValue
+    }
+
+    fun getFloat(path: String, defValue: Float = 0f): Float {
+        Timber.d("read: $path")
+        val p = data.traverse(path)?.yamlScalar
+        return p?.toFloat() ?: defValue
+    }
+
+    fun getString(path: String, defValue: String = ""): String {
+        Timber.d("read: $path")
+        val p = data.traverse(path)?.yamlScalar
+        return p?.content ?: defValue
+    }
+
+    fun getNode(path: String): YamlNode? {
+        Timber.d("read: $path")
+        return data.traverse(path)
+    }
+
+    fun getValue(path: String): YamlScalar? {
+        Timber.d("read: $path")
+        return data.traverse(path)?.yamlScalar
+    }
+
+    fun getList(path: String): YamlList? {
+        Timber.d("read: $path")
+        return data.traverse(path)?.yamlList
+    }
+
+    fun getMap(path: String): YamlMap? {
+        Timber.d("read: $path")
+        return data.traverse(path)?.yamlMap
+    }
+}

app/src/main/java/com/osfans/trime/util/config/ConfigData.kt

@@ -0,0 +1,57 @@
+package com.osfans.trime.util.config
+
+import com.charleskorn.kaml.Yaml
+import com.charleskorn.kaml.YamlConfiguration
+import com.charleskorn.kaml.YamlException
+import com.charleskorn.kaml.YamlMap
+import com.charleskorn.kaml.YamlNode
+import com.charleskorn.kaml.yamlMap
+import timber.log.Timber
+import java.io.File
+
+/**
+ * The wrapper of parsed YAML node.
+ */
+class ConfigData {
+    var root: YamlNode? = null
+
+    private val yaml = Yaml(
+        configuration = YamlConfiguration(
+            strictMode = false,
+        ),
+    )
+
+    fun loadFromFile(fileName: String): Boolean {
+        val configFile = File(fileName)
+        if (!configFile.exists()) {
+            Timber.w("Nonexistent config file $fileName")
+            return false
+        }
+        Timber.i("Loading config file $fileName")
+        try {
+            val doc = configFile
+                .inputStream()
+                .bufferedReader()
+                .use { it.readText() }
+            root = yaml.parseToYamlNode(doc)
+        } catch (e: YamlException) {
+            Timber.e("Error parsing YAML: ${e.message}")
+            return false
+        }
+        return true
+    }
+
+    fun traverse(path: String): YamlNode? {
+        Timber.d("traverse: $path")
+        if (path.isEmpty() || path == "/") return root
+        val keys = path.trimEnd('/').split('/')
+        var p = root
+        for (key in keys) {
+            if (p == null || p !is YamlMap) {
+                return null
+            }
+            p = p.yamlMap[key]
+        }
+        return p
+    }
+}