From ac6a192fb07b8c4673c5dd27bc36eb4db1b265c7 Mon Sep 17 00:00:00 2001
From: Brychan Dempsey <brychand@hotmail.com>
Date: Wed, 17 Mar 2021 17:27:48 +1300
Subject: [PATCH] Added multi-line parsing

---
 Assignment 1/Program.cs | 27 +++++++++++++++++++++++++--
 1 file changed, 25 insertions(+), 2 deletions(-)

diff --git a/Assignment 1/Program.cs b/Assignment 1/Program.cs
index 7ce071a..cc8f93a 100644
--- a/Assignment 1/Program.cs	
+++ b/Assignment 1/Program.cs	
@@ -88,20 +88,35 @@ namespace Assignment_1
                 long initSourceLength = source.Length;
                 if ((byte)source.ReadByte() == '{')
                 {
+                    long lastLinePos = 0;
+                    long initPos = 0;
+                    bool cont = false;
                     while (true)
                     {
                         if (dynamicInput)
                         {
-                            Console.WriteLine("Enter a command: ");
+                            lastLinePos = source.Position;
+                            if (!cont)
+                            {
+                                Console.WriteLine("Enter a command: ");
+                            }
                             string s = Console.ReadLine();
                             long pos = source.Position;
                             source.Write(Encoding.UTF8.GetBytes(s));
                             source.Position = pos;
+                            
                         }
                         // parse the statement or list of statements;
                         // This is done by reading the next word
+                        if (!cont)
+                        {
+                            initPos = source.Position;
+                        }
+                        else
+                        {
+                            source.Position = initPos;
+                        }
                         SkipWhitespace(source);
-                        long initPos = source.Position;
                         long position = FindNextWord(source, out string word);
                         try
                         {
@@ -165,6 +180,7 @@ namespace Assignment_1
                                 if (IsNextEoS(source))
                                 {
                                     // Increment the source pos past the semi-colon
+                                    cont = false;
                                     source.Position++;
                                     if (dynamicInput)
                                     {
@@ -173,6 +189,13 @@ namespace Assignment_1
                                     }
                                     result();
                                 }
+                                else if(source.Position != lastLinePos)
+                                {
+                                    // In the case that we expect some more data, we must keep tabs of our current line, and keep accumulating data until we're finished
+                                    cont = true;
+                                    source.WriteByte((byte)' ');
+                                    Console.Write(">");
+                                }
                                 else
                                 {
                                     throw new ParserException("expected a semi-colon", 0, source.Position);