From 36e0911c6ec27707a74f0b90b1052a16374243ea Mon Sep 17 00:00:00 2001
From: bjculkin <bjculkin@WIT-136XG42.wvu-ad.wvu.edu>
Date: Wed, 1 Mar 2017 10:13:41 -0500
Subject: Package reorganization

---
 dice-lang/src/bjc/dicelang/StreamEngine.java | 118 +++++++++++++++++++++++++++
 1 file changed, 118 insertions(+)
 create mode 100644 dice-lang/src/bjc/dicelang/StreamEngine.java

(limited to 'dice-lang/src/bjc/dicelang/StreamEngine.java')

diff --git a/dice-lang/src/bjc/dicelang/StreamEngine.java b/dice-lang/src/bjc/dicelang/StreamEngine.java
new file mode 100644
index 0000000..2971392
--- /dev/null
+++ b/dice-lang/src/bjc/dicelang/StreamEngine.java
@@ -0,0 +1,118 @@
+package bjc.dicelang;
+
+import bjc.utils.funcdata.FunctionalList;
+import bjc.utils.funcdata.IList;
+import bjc.utils.funcutils.ListUtils;
+
+import static bjc.dicelang.Errors.ErrorKey.*;
+
+import bjc.utils.esodata.SingleTape;
+import bjc.utils.esodata.Tape;
+
+public class StreamEngine {
+	private DiceLangEngine eng;
+
+	private Tape<IList<String>> streams;
+	private IList<String>       currStream;
+
+	public StreamEngine(DiceLangEngine engine) {
+		eng = engine;
+	}
+
+	private void init() {
+		streams = new SingleTape<>();
+
+		currStream = new FunctionalList<>();
+		streams.insertBefore(currStream);
+	}
+
+	public boolean doStreams(String[] toks, IList<String> dest) {
+		init();
+
+		boolean quoteMode = false;
+
+		for(String tk : toks) {
+			if(tk.startsWith("{@S") && !quoteMode) {
+				if(tk.equals("{@SQ}")) {
+					quoteMode = true;
+				} else if(!processCommand(tk)) {
+					return false;
+				}
+				// Command ran correctly, continue
+			} else {
+				if(tk.equals("{@SU}")) {
+					quoteMode = false;
+				} else if(tk.startsWith("\\") && tk.endsWith("{@SU}")) {
+					currStream.add(tk.substring(1));
+				} else {
+					currStream.add(tk);
+				}
+			}
+		}
+
+		for(String tk : currStream) {
+			dest.add(tk);
+		}
+
+		return true;
+	}
+
+	private boolean processCommand(String tk) {
+		char[] comms = null;
+
+		if(tk.length() > 5) {
+			comms = tk.substring(3, tk.length() - 1).toCharArray();
+		} else {
+			comms = new char[1];
+			comms[0] = tk.charAt(3);
+		}
+
+		for(char comm : comms) {
+			switch(comm) {
+				case '+':
+					streams.insertAfter(new FunctionalList<>());
+					break;
+				case '>':
+					if(!streams.right()) {
+						Errors.inst.printError(EK_STRM_NONEX);
+						return false;
+					}
+
+					currStream = streams.item();
+					break;
+				case '<':
+					if(!streams.left()) {
+						Errors.inst.printError(EK_STRM_NONEX);
+						return false;
+					}
+
+					currStream = streams.item();
+					break;
+				case '-':
+					if(streams.size() == 1) {
+						Errors.inst.printError(EK_STRM_LAST);
+						return false;
+					} else {
+						streams.remove();
+						currStream = streams.item();
+					}
+					break;
+				case 'S':
+					if(streams.size() == 1) {
+						Errors.inst.printError(EK_STRM_LAST);
+						return false;
+					} else {
+						IList<String> stringLit = streams.remove();
+						currStream = streams.item();
+						currStream.add(ListUtils.collapseTokens(stringLit, " "));
+					}
+					break;
+				default:
+					Errors.inst.printError(EK_STRM_INVCOM, tk);
+					return false;
+			}
+		}
+
+		return true;
+	}
+}
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