style: refactored time offset generation of beat inside of Simfile class

1 files changed, 69 insertions, 47 deletions

diff --git a/lib/simfile.dart b/lib/simfile.dart
index 2174de9..102c989 100644
--- a/lib/simfile.dart
+++ b/lib/simfile.dart
@@ -32,6 +32,8 @@ class Chart {
   String? radarValues;
 
   List<List<String>>? measures;
+
+  Map<double, String> beats = {};
 }
 
 class Simfile {
@@ -48,62 +50,82 @@ class Simfile {
 
   Simfile(this.path);
 
-  void load() {
-    lines = File(path).readAsStringSync();
-
-    RegExp commentsRegExp = RegExp(r'//.*$');
-    lines = lines?.replaceAll(commentsRegExp, '');
-    RegExp fieldDataRegExp = RegExp(r'#([^;]+):([^;]*);');
-
-    for (final fieldData in fieldDataRegExp.allMatches(lines!)) {
-      List<String> keys =
-          fieldData[1]!.split(':').map((key) => key.trim()).toList();
-      String value = fieldData[2]!;
-      if (keys[0] == "BPMS") {
-        for (final pairRaw in value.split(',')) {
-          List<String> pair = pairRaw.split('=');
-          if (pair.length != 2) {
-            continue;
+  void _parseChart({required List<String> keys, required String value}) {
+    Chart chart = Chart();
+    chart.chartType = keys[1];
+    chart.author = keys[2];
+    chart.difficulty = Difficulty.values.byName(keys[3]);
+    chart.numericalMeter = int.parse(keys[4]);
+    chart.radarValues = keys[5];
+
+    if (chartSimplest == null ||
+        (chart.difficulty!.index <= chartSimplest!.difficulty!.index &&
+            chart.numericalMeter! <= chartSimplest!.numericalMeter!)) {
+      List<List<String>> measures = [];
+      for (final measureRaw in value.split(',')) {
+        List<String> measure = [];
+        for (final noteRaw in measureRaw.split('\n')) {
+          String note = noteRaw.trim();
+          if (noteTypes.hasMatch(note)) {
+            measure.add(note);
           }
-          double time = double.parse(pair[0]);
-          double bpm = double.parse(pair[1]);
-          bpms[time] = bpm;
         }
+        measures.add(measure);
       }
 
-      if (keys[0] == "OFFSET") {
-        offset = double.parse(value);
-      }
+      double bpm = bpms.entries.first.value;
 
-      if (keys[0] != "NOTES") {
-        tags[keys[0]] = value;
-        continue;
+      for (final (measureIndex, measure) in measures.indexed) {
+        for (final (noteIndex, noteData) in measure.indexed) {
+          double beat = measureIndex * 4.0 +
+              (noteIndex.toDouble() / measure.length) * 4.0;
+          double minutesPerBeat = 1.0 / bpm;
+          double offsetMinutes = offset / 60.0;
+          chart.beats[beat * minutesPerBeat + offsetMinutes] = noteData;
+        }
       }
 
-      Chart chart = Chart();
-      chart.chartType = keys[1];
-      chart.author = keys[2];
-      chart.difficulty = Difficulty.values.byName(keys[3]);
-      chart.numericalMeter = int.parse(keys[4]);
-      chart.radarValues = keys[5];
-
-      if (chartSimplest == null ||
-          (chart.difficulty!.index <= chartSimplest!.difficulty!.index &&
-              chart.numericalMeter! <= chartSimplest!.numericalMeter!)) {
-        List<List<String>> measures = [];
-        for (final measureRaw in value.split(',')) {
-          List<String> measure = [];
-          for (final noteRaw in measureRaw.split('\n')) {
-            String note = noteRaw.trim();
-            if (noteTypes.hasMatch(note)) {
-              measure.add(note);
-            }
-          }
-          measures.add(measure);
+      chart.measures = measures;
+      chartSimplest = chart;
+    }
+  }
+
+  void _parseTag(RegExpMatch fieldData) {
+    List<String> keys =
+        fieldData[1]!.split(':').map((key) => key.trim()).toList();
+    String value = fieldData[2]!;
+    if (keys[0] == "BPMS") {
+      for (final pairRaw in value.split(',')) {
+        List<String> pair = pairRaw.split('=');
+        if (pair.length != 2) {
+          continue;
         }
-        chart.measures = measures;
-        chartSimplest = chart;
+        double time = double.parse(pair[0]);
+        double bpm = double.parse(pair[1]);
+        bpms[time] = bpm;
       }
     }
+
+    if (keys[0] == "OFFSET") {
+      offset = double.parse(value);
+    }
+
+    if (keys[0] != "NOTES") {
+      tags[keys[0]] = value;
+      return;
+    }
+    _parseChart(keys: keys, value: value);
+  }
+
+  void load() {
+    lines = File(path).readAsStringSync();
+
+    RegExp commentsRegExp = RegExp(r'//.*$');
+    lines = lines?.replaceAll(commentsRegExp, '');
+    RegExp fieldDataRegExp = RegExp(r'#([^;]+):([^;]*);');
+
+    for (final fieldData in fieldDataRegExp.allMatches(lines!)) {
+      _parseTag(fieldData);
+    }
   }
 }