From e03b3f477bcc160b72af4ab09cd8d12081017d2c Mon Sep 17 00:00:00 2001
From: bculkin2442 <bjculkin@mix.wvu.edu>
Date: Sun, 19 Feb 2017 08:30:45 -0500
Subject: Lots of things, but mostly evaluation

---
 dice-lang/src/bjc/dicelang/v2/Parser.java | 147 ++++++++++++++++++++++++++++++
 1 file changed, 147 insertions(+)
 create mode 100644 dice-lang/src/bjc/dicelang/v2/Parser.java

(limited to 'dice-lang/src/bjc/dicelang/v2/Parser.java')

diff --git a/dice-lang/src/bjc/dicelang/v2/Parser.java b/dice-lang/src/bjc/dicelang/v2/Parser.java
new file mode 100644
index 0000000..0e778b4
--- /dev/null
+++ b/dice-lang/src/bjc/dicelang/v2/Parser.java
@@ -0,0 +1,147 @@
+package bjc.dicelang.v2;
+
+import java.util.Deque;
+import java.util.LinkedList;
+
+import bjc.utils.data.ITree;
+import bjc.utils.data.Tree;
+import bjc.utils.funcdata.IList;
+
+import static bjc.dicelang.v2.Node.Type.*;
+import static bjc.dicelang.v2.Token.Type.*;
+
+public class Parser {
+	public Parser() {
+
+	}
+
+	public boolean parseTokens(IList<Token> tokens,
+			IList<ITree<Node>> results) {
+		Deque<ITree<Node>> working = new LinkedList<>();
+
+		for(Token tk : tokens) {
+			switch(tk.type) {
+				case OBRACKET:
+				case OBRACE:
+					working.push(new Tree<>(new Node(OGROUP, tk)));
+					break;
+				case CBRACKET:
+				case CBRACE:
+					if(working.size() == 0) {
+						System.out.println("\tERROR: Group closing with no possible group opener");
+						return false;
+					}
+					
+					ITree<Node> groupNode = null;
+					switch(tk.type) {
+						case CBRACE:
+							groupNode = new Tree<>(new Node(GROUP, Node.GroupType.CODE));
+							break;
+						case CBRACKET:
+							groupNode = new Tree<>(new Node(GROUP, Node.GroupType.ARRAY));
+							break;
+						default:
+							break;
+					}
+					Token matching = null;
+
+					if(tk.type == CBRACKET) {
+						matching = new Token(Token.Type.OBRACKET, tk.intValue);
+					} else if(tk.type == CBRACE) {
+						matching = new Token(Token.Type.OBRACE, tk.intValue);
+					}
+
+					ITree<Node> matchNode = new Tree<>(new Node(OGROUP, matching));
+
+					if(!working.contains(matchNode)) {
+						System.out.println("\tERROR: Found group closing without group opener: (closing was " + tk + ", matcher was "
+								+ matchNode + ")");
+
+						System.out.println("\tCurrent forest is: ");
+
+						int treeNo = 1;
+						for(ITree<Node> ast : working) {
+							System.out.println("Tree " + treeNo++ + ": " + ast.toString());
+						}
+						return false;
+					} else {
+						Deque<ITree<Node>> childs = new LinkedList<>();
+
+						while(!working.peek().equals(matchNode)) {
+							childs.push(working.pop());
+						}
+
+						// Discard opener
+						working.pop();
+
+						for(ITree<Node> child : childs) {
+							groupNode.addChild(child);
+						}
+
+						working.push(groupNode);
+					}
+					break;
+				case LET:
+				case BIND:
+					if(working.size() < 2) {
+						System.out.println("\tERROR: Let and bind require at least two operands");
+					} else {
+						ITree<Node> right = working.pop();
+						ITree<Node> left  = working.pop();
+
+						ITree<Node> opNode = new Tree<>(new Node(BINOP, tk.type));
+						
+						working.push(opNode);
+					}
+					break;
+				case ADD:
+				case SUBTRACT:
+				case MULTIPLY:
+				case DIVIDE:
+				case IDIVIDE:
+				case DICEGROUP:
+				case DICECONCAT:
+				case DICELIST:
+					if(working.size() == 0) {
+						System.out.println("\tERROR: Binary operator " + tk.type + " requires more operands than provided.");
+						return false;
+					} else if(working.size() == 1) {
+						ITree<Node> operand = working.pop();
+
+						ITree<Node> opNode  = new Tree<>(new Node(UNARYOP, tk.type));
+						
+						opNode.addChild(operand);
+
+						working.push(opNode);
+					} else {
+						ITree<Node> right = working.pop();
+						ITree<Node> left  = working.pop();
+
+						ITree<Node> opNode = new Tree<>(new Node(BINOP, tk.type));
+						
+						opNode.addChild(left);
+						opNode.addChild(right);
+
+						working.push(opNode);
+					}
+					break;
+				case INT_LIT:
+				case FLOAT_LIT:
+				case STRING_LIT:
+				case VREF:
+				case DICE_LIT:
+					working.push(new Tree<>(new Node(TOKREF, tk)));
+					break;
+				default:
+					System.out.println("\tERROR: Unrecognized token type in parsing: " + tk.type);
+					return false;
+			}
+		}
+
+		for(ITree<Node> ast : working) {
+			results.add(ast);
+		}
+
+		return true;
+	}
+}
-- 
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