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Support Parsing "Sheet Music" into Channels
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| Original file line number | Diff line number | Diff line change |
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| @@ -1,4 +1,4 @@ | ||
| name: .NET Core Desktop | ||
| name: Build and Test | ||
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| on: | ||
| push: | ||
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,3 @@ | ||
| using System.Runtime.CompilerServices; | ||
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| [assembly: InternalsVisibleTo("SoundMakerTests")] |
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| namespace SoundMaker.ScoreData.SMSC; | ||
| public record Error | ||
| { | ||
| internal Error(SMSCReadErrorType type, Token? token) | ||
| { | ||
| Type = type; | ||
| LineNumber = token?.LineNumber ?? 0; | ||
| Literal = token?.Literal ?? ""; | ||
| } | ||
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| /// <summary> | ||
| /// Type of errors <br/> | ||
| /// エラーの種類 | ||
| /// </summary> | ||
| public SMSCReadErrorType Type { get; } | ||
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| /// <summary> | ||
| /// String of error location <br/> | ||
| /// エラー箇所の文字列 | ||
| /// </summary> | ||
| public string Literal { get; } | ||
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| /// <summary> | ||
| /// Line number of error.<br/> | ||
| /// エラー箇所の行番号 | ||
| /// </summary> | ||
| public int LineNumber { get; } | ||
| } |
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| using System.Text; | ||
| using System.Text.RegularExpressions; | ||
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| namespace SoundMaker.ScoreData.SMSC; | ||
| internal class Lexer | ||
| { | ||
| private readonly Regex _alphaRegex = new("[a-z]|[A-Z]"); | ||
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| private readonly string _data = ""; | ||
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| public Lexer(string data) | ||
| { | ||
| _data = data; | ||
| } | ||
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| public List<Token> ReadAll() | ||
| { | ||
| var tokens = new List<Token>(); | ||
| var data = _data.Replace("\r\n", "\n").Replace('\r', '\n'); | ||
| // 空白、空文字列、コメントだけの行をあらかじめ除外する | ||
| var lines = data.Split('\n').ToArray(); | ||
| for (var i = 0; i < lines.Length; i++) | ||
| { | ||
| var line = lines[i]; | ||
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| // 空白またはコメントだけの行はスキップする | ||
| if (string.IsNullOrWhiteSpace(line) || line.StartsWith("//")) | ||
| { | ||
| continue; | ||
| } | ||
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| var lineNumber = i + 1; | ||
| var chars = line.ToCharArray(); | ||
| var otherTypeLiteralBuilder = new StringBuilder(); | ||
| var numberLiteralBuilder = new StringBuilder(); | ||
| for (var j = 0; j < chars.Length; j++) | ||
| { | ||
| char? next = j + 1 < chars.Length ? chars[j + 1] : null; | ||
| // numbers | ||
| if (char.IsNumber(chars[j])) | ||
| { | ||
| _ = numberLiteralBuilder.Append(chars[j]); | ||
| if (otherTypeLiteralBuilder.Length != 0) | ||
| { | ||
| var literal = otherTypeLiteralBuilder.ToString(); | ||
| var type = MatchOtherType(literal); | ||
| tokens.Add(new(type, otherTypeLiteralBuilder.ToString(), lineNumber)); | ||
| _ = otherTypeLiteralBuilder.Clear(); | ||
| } | ||
| continue; | ||
| } | ||
| // others | ||
| if (IsOtherChar(chars[j], next)) | ||
| { | ||
| _ = otherTypeLiteralBuilder.Append(chars[j]); | ||
| if (numberLiteralBuilder.Length != 0) | ||
| { | ||
| var literal = numberLiteralBuilder.ToString(); | ||
| tokens.Add(new(TokenType.Number, literal, lineNumber)); | ||
| _ = numberLiteralBuilder.Clear(); | ||
| } | ||
| continue; | ||
| } | ||
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| if (numberLiteralBuilder.Length != 0) | ||
| { | ||
| var literal = numberLiteralBuilder.ToString(); | ||
| tokens.Add(new(TokenType.Number, literal, lineNumber)); | ||
| _ = numberLiteralBuilder.Clear(); | ||
| } | ||
| if (otherTypeLiteralBuilder.Length != 0) | ||
| { | ||
| var literal = otherTypeLiteralBuilder.ToString(); | ||
| var type = MatchOtherType(literal); | ||
| tokens.Add(new(type, literal, lineNumber)); | ||
| _ = otherTypeLiteralBuilder.Clear(); | ||
| } | ||
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| // comment out | ||
| if (j + 1 < chars.Length && IsCommentPrefix(chars[j], next)) | ||
| { | ||
| break; | ||
| } | ||
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| // space | ||
| if (char.IsWhiteSpace(chars[j])) | ||
| { | ||
| continue; | ||
| } | ||
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| // symbols | ||
| Token token = chars[j] switch | ||
| { | ||
| '.' => new(TokenType.Dot, ".", lineNumber), | ||
| '#' => new(TokenType.Sharp, "#", lineNumber), | ||
| '(' => new(TokenType.LeftParentheses, "(", lineNumber), | ||
| ')' => new(TokenType.RightParentheses, ")", lineNumber), | ||
| ',' => new(TokenType.Comma, ",", lineNumber), | ||
| ';' => new(TokenType.Semicolon, ";", lineNumber), | ||
| _ => new(TokenType.Unknown, chars[j].ToString(), lineNumber), | ||
| }; | ||
| tokens.Add(token); | ||
| } | ||
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| if (numberLiteralBuilder.Length != 0) | ||
| { | ||
| var literal = numberLiteralBuilder.ToString(); | ||
| tokens.Add(new(TokenType.Number, literal, lineNumber)); | ||
| _ = numberLiteralBuilder.Clear(); | ||
| } | ||
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| if (otherTypeLiteralBuilder.Length != 0) | ||
| { | ||
| var literal = otherTypeLiteralBuilder.ToString(); | ||
| var type = MatchOtherType(literal); | ||
| tokens.Add(new(type, literal, lineNumber)); | ||
| _ = otherTypeLiteralBuilder.Clear(); | ||
| } | ||
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| tokens.Add(new(TokenType.LineBreak, "\n", lineNumber)); | ||
| } | ||
| return tokens; | ||
| } | ||
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| private TokenType MatchOtherType(string other) | ||
| { | ||
| if (int.TryParse(other, out _)) | ||
| { | ||
| return TokenType.Number; | ||
| } | ||
| if (_alphaRegex.IsMatch(other)) | ||
| { | ||
| return other switch | ||
| { | ||
| "tie" => TokenType.Tie, | ||
| "tup" => TokenType.Tuplet, | ||
| "rest" => TokenType.Rest, | ||
| _ => TokenType.Alphabet, | ||
| }; | ||
| } | ||
| return TokenType.Unknown; | ||
| } | ||
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| private bool IsOtherChar(char character, char? nextCharacter) | ||
| { | ||
| var next = nextCharacter ?? 'a'; // 'a' is not comment prefix. | ||
| return | ||
| !IsSymbol(character) && | ||
| !IsCommentPrefix(character, next) && | ||
| !char.IsWhiteSpace(character); | ||
| } | ||
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| private bool IsCommentPrefix(char character, char? nextCharacter) | ||
| { | ||
| return character is '/' && nextCharacter is '/'; | ||
| } | ||
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| private bool IsSymbol(char character) | ||
| { | ||
| return character is '.' or '#' or '(' or ')' or ',' or ';'; | ||
| } | ||
| } |
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