init

index.ts

@@ -0,0 +1,72 @@
+import { 
+  TJAParser, 
+  NoteSequence, 
+  BPMChangeCommand, 
+  MeasureCommand, 
+  DelayCommand 
+} from "tja";
+import { readFile } from "node:fs/promises";
+
+async function main() {
+  const filePath = "tja/1.tja";
+  console.log(`Analyzing ${filePath}...`);
+
+  try {
+    const content = await readFile(filePath, "utf-8");
+    const parsed = TJAParser.parse(content);
+
+    console.log("\n--- Metadata ---");
+    console.log(`Title: ${parsed.title}`);
+    console.log(`BPM: ${parsed.bpm}`);
+    console.log(`Offset: ${parsed.offset}`);
+
+    console.log("\n--- Courses ---");
+    parsed.courses.forEach((course, index) => {
+      console.log(`Course ${index + 1}: ${course.difficulty} (Stars: ${course.stars})`);
+      const commands = course.activeCourse.getCommands();
+      
+      let totalNotes = 0;
+      let currentTime = 0; // in seconds
+      let currentBPM = parsed.bpm || 120;
+      let currentMeasure = { numerator: 4, denominator: 4 };
+      
+      commands.forEach(cmd => {
+        if (cmd instanceof BPMChangeCommand) {
+          currentBPM = cmd.bpm;
+        } else if (cmd instanceof MeasureCommand) {
+          currentMeasure = { 
+            numerator: cmd.numerator, 
+            denominator: cmd.denominator 
+          };
+        } else if (cmd instanceof DelayCommand) {
+          currentTime += cmd.delay;
+        } else if (cmd instanceof NoteSequence) {
+          // Duration of one measure in seconds: 
+          // (60 / BPM) * 4 * (numerator / denominator)
+          const measureDuration = (60 / currentBPM) * 4 * (currentMeasure.numerator / currentMeasure.denominator);
+          
+          const notesInSequence = cmd.notes;
+          const noteCount = notesInSequence.length;
+          
+          notesInSequence.forEach((note) => {
+            if (!note.isBlank && !note.isMeasureEnd) {
+              totalNotes++;
+            }
+          });
+          
+          currentTime += measureDuration;
+        }
+      });
+
+      const nps = currentTime > 0 ? (totalNotes / currentTime).toFixed(2) : "0.00";
+      console.log(`  Total Notes: ${totalNotes}`);
+      console.log(`  Estimated Duration: ${currentTime.toFixed(2)}s`);
+      console.log(`  Average NPS: ${nps}`);
+    });
+
+  } catch (error) {
+    console.error("Error analyzing TJA file:", error);
+  }
+}
+
+main();