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105 lines
2.7 KiB
105 lines
2.7 KiB
using System;
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using System.Collections.Generic;
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using System.Text;
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using System.IO;
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using System.Text.RegularExpressions;
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namespace SuperBASIC
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{
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class Parser
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{
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[Serializable]
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public class ParseException : Exception
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{
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public ParseException() { }
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public ParseException(string message) : base(message) { }
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public ParseException(string message, Exception inner) : base(message, inner) { }
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protected ParseException(
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System.Runtime.Serialization.SerializationInfo info,
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System.Runtime.Serialization.StreamingContext context) : base(info, context) { }
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}
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readonly Library library;
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readonly Runtime runtime;
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public Parser(Runtime rt)
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{
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runtime = rt;
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library = rt.lib;
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}
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public Bytecode ParseFile(string filepath)
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{
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Bytecode c = new Bytecode();
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string[] sourceLines = File.ReadAllLines(filepath);
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Regex lws = new Regex(@"\s+");
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Regex leadings = new Regex(@"^\s+");
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Regex trailings = new Regex(@"\s+$");
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List<string> codeLines = new List<string>();
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List<int> lineSpans = new List<int>();
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int a = 0;
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foreach (string line in sourceLines)
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{
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a++;
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string l = lws.Replace(line, " ");
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l = leadings.Replace(l, "");
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l = trailings.Replace(l, "");
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if(l != String.Empty)
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{
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lineSpans.Add(a);
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a = 0;
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codeLines.Add(l);
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}
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}
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for(int idx = 0; idx < codeLines.Count; idx++)
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{
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string line = codeLines[idx];
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var components = line.Split(' ');
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if(!library.nameResolution.ContainsKey(components[0]))
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{
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int lineIndex = 0;
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foreach (int cnt in lineSpans.GetRange(0, idx+1)) lineIndex += cnt;
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throw new ParseException($"Unknown operation \"{components[0]}\"\n\tat line {lineIndex}");
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}
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int opcode = library.nameResolution[components[0]];
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int arity = library.arities[opcode];
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if(arity != components.Length-1)
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{
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int lineIndex = 0;
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foreach (int cnt in lineSpans.GetRange(0, idx+1)) lineIndex += cnt;
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throw new ParseException($"Operation {components[0]} was provided with the wrong number of arguments\n\tExpected {arity} found {components.Length-1}\n\tat line {lineIndex}");
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}
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c.bytecode.Add(new BasicNumber(runtime, opcode));
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foreach (string elem in components.AsSpan(1))
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{
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if (elem != "$")
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{
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try
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{
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float v = float.Parse(elem);
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c.bytecode.Add(new BasicNumber(runtime, v));
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}
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catch(Exception) {
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int lineIndex = 0;
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foreach (int cnt in lineSpans.GetRange(0, idx+1)) lineIndex += cnt;
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throw new ParseException($"Cannot parse {elem} as argument\n\tExpected floating point number or '$'\n\tat line {lineIndex}");
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}
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}
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else
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{
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c.bytecode.Add(new BasicNumber(runtime));
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}
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}
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}
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return c;
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}
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}
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}
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