initial parser

3 files changed, 54 insertions, 0 deletions

diff --git a/src/utils/exception.ts b/src/utils/exception.ts
new file mode 100644
index 0000000..625c32a
--- /dev/null
+++ b/src/utils/exception.ts
@@ -0,0 +1 @@
+export class NotImplementedException extends Error {}
diff --git a/src/utils/index.ts b/src/utils/index.ts
new file mode 100644
index 0000000..f44ed5a
--- /dev/null
+++ b/src/utils/index.ts
@@ -0,0 +1,2 @@
+export * from './logger';
+export * from './exception';
diff --git a/src/utils/logger.ts b/src/utils/logger.ts
new file mode 100644
index 0000000..80126c3
--- /dev/null
+++ b/src/utils/logger.ts
@@ -0,0 +1,51 @@
+export interface TracingLogger {
+  info(log: string): void;
+  warn(log: string): void;
+  error(log: string): void;
+  debug(log: string): void;
+
+  createChild(prefix: string): TracingLogger;
+}
+
+export type LogLevel = 'debug' | 'info' | 'warn' | 'error';
+
+export class ConsoleTracingLogger implements TracingLogger {
+  protected prefix: string;
+  private levels: LogLevel[];
+
+  constructor(prefix: string, levels: LogLevel[] = ['warn', 'error']) {
+    this.prefix = prefix;
+    this.levels = levels;
+  }
+
+  private makePrefix(level: LogLevel): string {
+    return `[${new Date().toISOString()}] ${level} (${this.prefix}) > `;
+  }
+
+  public info(log: string) {
+    if (this.levels.includes('info'))
+      console.log(this.makePrefix('info') + log);
+  }
+
+  public warn(log: string) {
+    if (this.levels.includes('warn'))
+      console.warn(this.makePrefix('warn') + log);
+  }
+
+  public error(log: string) {
+    if (this.levels.includes('error'))
+      console.error(this.makePrefix('error') + log);
+  }
+
+  public debug(log: string) {
+    if (this.levels.includes('debug'))
+      console.debug(this.makePrefix('debug') + log);
+  }
+
+  public createChild(prefix: string, levels?: LogLevel[]) {
+    return new ConsoleTracingLogger(
+      `${this.prefix} -> ${prefix}`,
+      levels ?? this.levels,
+    );
+  }
+}