From d0d6aae1e56428f597f69f5c9cfb261afe671f5d Mon Sep 17 00:00:00 2001
From: Elizabeth Hunt <elizabeth.hunt@simponic.xyz>
Date: Fri, 23 Feb 2024 16:46:10 -0700
Subject: initial parser

---
 src/index.ts | 63 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)
 create mode 100644 src/index.ts

(limited to 'src/index.ts')

diff --git a/src/index.ts b/src/index.ts
new file mode 100644
index 0000000..29047f2
--- /dev/null
+++ b/src/index.ts
@@ -0,0 +1,63 @@
+import { args, type Args } from '@/args';
+import { join } from 'path';
+import { watch } from 'fs/promises';
+import { generateParser, GRAMMAR_FILE, GENERATED_PARSER } from '@/parser';
+import {
+  ConsoleTracingLogger,
+  type LogLevel,
+  type TracingLogger,
+} from '@/utils';
+import { evaluate } from '@/interpreter';
+
+const LOG_LEVELS: LogLevel[] = ['info', 'warn', 'error'];
+
+const devMode = async (logger: TracingLogger) => {
+  logger.info('Watching for changes in parser...');
+
+  const watcher = watch(import.meta.dir, { recursive: true });
+  for await (const event of watcher) {
+    if (event.filename?.endsWith(GRAMMAR_FILE)) {
+      const grammarFile = join(import.meta.dir, event.filename);
+      const outputFile = join(
+        import.meta.dir,
+        event.filename.replace(GRAMMAR_FILE, GENERATED_PARSER),
+      );
+      logger.info(
+        `Generating parser at Location=(${grammarFile}) to Source=(${outputFile})...`,
+      );
+      generateParser(grammarFile, outputFile);
+    }
+  }
+};
+
+const doRepl = async (prompt = '~> ') => {
+  process.stdout.write(prompt);
+
+  for await (const line of console) {
+    const result = await evaluate(line);
+    console.log(result);
+    break;
+  }
+
+  await doRepl(prompt);
+};
+
+export const main = async (args: Args) => {
+  if (args.devMode) {
+    LOG_LEVELS.push('debug');
+  }
+
+  const logger = new ConsoleTracingLogger('main', LOG_LEVELS);
+
+  if (args.devMode) {
+    logger.info('Starting in dev mode...');
+    await devMode(logger);
+  }
+
+  if (args.repl) {
+    logger.info('Starting REPL...');
+    logger.info('Welcome to the CPS interpreter!');
+  }
+};
+
+main(args);
-- 
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