Add logging module (denoland/deno_std#33)

Original: https://github.com/denoland/deno_std/commit/25b88bcf8c260865d2b6b68f539c4772bac095ee

1 files changed, 44 insertions, 0 deletions

diff --git a/logging/logger.ts b/logging/logger.ts
new file mode 100644
index 000000000..733b1fd09
--- /dev/null
+++ b/logging/logger.ts
@@ -0,0 +1,44 @@
+import { LogLevel, getLevelByName, getLevelName } from "./levels.ts";
+
+export class Logger {
+  level: number;
+  levelName: string;
+  handlers: any[];
+
+  constructor(levelName, handlers) {
+    this.level = getLevelByName(levelName);
+    this.levelName = levelName;
+    this.handlers = handlers;
+  }
+
+  _log(level, ...args) {
+    this.handlers.forEach(handler => {
+      handler.handle(level, ...args);
+    });
+  }
+
+  log(level, ...args) {
+    if (this.level > level) return;
+    return this._log(level, ...args);
+  }
+
+  debug(...args) {
+    return this.log(LogLevel.DEBUG, ...args);
+  }
+
+  info(...args) {
+    return this.log(LogLevel.INFO, ...args);
+  }
+
+  warning(...args) {
+    return this.log(LogLevel.WARNING, ...args);
+  }
+
+  error(...args) {
+    return this.log(LogLevel.ERROR, ...args);
+  }
+
+  critical(...args) {
+    return this.log(LogLevel.CRITICAL, ...args);
+  }
+}