132 lines
3.4 KiB
Dart
132 lines
3.4 KiB
Dart
import 'dart:ffi';
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import 'dart:io';
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enum Difficulty { Beginner, Easy, Medium, Hard, Challenge, Edit }
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// These are the standard note values:
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//
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// 0 – No note
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// 1 – Normal note
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// 2 – Hold head
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// 3 – Hold/Roll tail
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// 4 – Roll head
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// M – Mine (or other negative note)
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//
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// Later versions of StepMania accept other note values which may not work in older versions:
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//
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// K – Automatic keysound
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// L – Lift note
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// F – Fake note
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RegExp noteTypes = RegExp(r'^([012345MKLF]+)\s*([,;])?');
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class Chart {
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String? chartType;
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// Description/author
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String? author;
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// Difficulty (one of Beginner, Easy, Medium, Hard, Challenge, Edit)
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Difficulty? difficulty;
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// Numerical meter
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int? numericalMeter;
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// Groove radar values, generated by the program
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String? radarValues;
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List<List<String>>? measures;
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Map<double, String> beats = {};
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}
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class Simfile {
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String path;
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String? lines;
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// tags of simfile
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Map<String, String> tags = {};
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Chart? chartSimplest;
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Map<double, double> bpms = {};
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double offset = 0;
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Simfile(this.path);
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void _parseChart({required List<String> keys, required String value}) {
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Chart chart = Chart();
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chart.chartType = keys[1];
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chart.author = keys[2];
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chart.difficulty = Difficulty.values.byName(keys[3]);
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chart.numericalMeter = int.parse(keys[4]);
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chart.radarValues = keys[5];
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if (chartSimplest == null ||
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(chart.difficulty!.index <= chartSimplest!.difficulty!.index &&
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chart.numericalMeter! <= chartSimplest!.numericalMeter!)) {
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List<List<String>> measures = [];
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for (final measureRaw in value.split(',')) {
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List<String> measure = [];
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for (final noteRaw in measureRaw.split('\n')) {
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String note = noteRaw.trim();
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if (noteTypes.hasMatch(note)) {
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measure.add(note);
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}
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}
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measures.add(measure);
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}
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double bpm = bpms.entries.first.value;
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for (final (measureIndex, measure) in measures.indexed) {
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for (final (noteIndex, noteData) in measure.indexed) {
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double beat = measureIndex * 4.0 +
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(noteIndex.toDouble() / measure.length) * 4.0;
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double minutesPerBeat = 1.0 / bpm;
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double offsetMinutes = offset / 60.0;
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chart.beats[beat * minutesPerBeat + offsetMinutes] = noteData;
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}
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}
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chart.measures = measures;
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chartSimplest = chart;
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}
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}
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void _parseTag(RegExpMatch fieldData) {
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List<String> keys =
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fieldData[1]!.split(':').map((key) => key.trim()).toList();
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String value = fieldData[2]!;
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if (keys[0] == "BPMS") {
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for (final pairRaw in value.split(',')) {
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List<String> pair = pairRaw.split('=');
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if (pair.length != 2) {
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continue;
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}
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double time = double.parse(pair[0]);
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double bpm = double.parse(pair[1]);
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bpms[time] = bpm;
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}
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}
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if (keys[0] == "OFFSET") {
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offset = double.parse(value);
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}
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if (keys[0] != "NOTES") {
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tags[keys[0]] = value;
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return;
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}
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_parseChart(keys: keys, value: value);
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}
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void load() {
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lines = File(path).readAsStringSync();
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RegExp commentsRegExp = RegExp(r'//.*$');
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lines = lines?.replaceAll(commentsRegExp, '');
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RegExp fieldDataRegExp = RegExp(r'#([^;]+):([^;]*);');
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for (final fieldData in fieldDataRegExp.allMatches(lines!)) {
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_parseTag(fieldData);
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}
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}
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}
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