From 5f3fb9afece2125cbeba79d61a8d88460b7878d7 Mon Sep 17 00:00:00 2001
From: Joshua Rahm <joshua.rahm@colorado.edu>
Date: Tue, 27 Jan 2015 18:40:32 -0700
Subject: initial commit

---
 .../dataread/expressions/ExpressionPart.java       | 136 +++++++++++++++++++++
 1 file changed, 136 insertions(+)
 create mode 100644 project/JavaCommon/src/com/modulus/dataread/expressions/ExpressionPart.java

(limited to 'project/JavaCommon/src/com/modulus/dataread/expressions/ExpressionPart.java')

diff --git a/project/JavaCommon/src/com/modulus/dataread/expressions/ExpressionPart.java b/project/JavaCommon/src/com/modulus/dataread/expressions/ExpressionPart.java
new file mode 100644
index 0000000..bf4e8d8
--- /dev/null
+++ b/project/JavaCommon/src/com/modulus/dataread/expressions/ExpressionPart.java
@@ -0,0 +1,136 @@
+package com.modulus.dataread.expressions;
+
+/**
+ * This class is used to help to assemble the code into more
+ * readable code for the computer, it sets the system based on
+ * a more of a stack-ish way so the virtual machine can linearly
+ * push/pop arguments and call functions.
+ * 
+ * @author jrahm
+ *
+ */
+public abstract class ExpressionPart {
+	
+	// Null if function is global
+	private ExpressionPart caller;
+	private ExpressionPart[] args;
+	
+	private String function;
+	private boolean primary = false;
+	
+	private ExpressionPart(){}
+	
+	/**
+	 * This creates a new Expression part meant to handle multi-part
+	 * expressions such as expressions with parenthesis, functions 
+	 * inside of functions and so on.
+	 * 
+	 * Q-Bar is set up to be very functional, to the point where every entity is made
+	 * of functions being called on arguments and such.
+	 * 
+	 * @param caller the caller of the function (null if the function is global)
+	 * @param function the function to be called
+	 * @param args the arguments of the function
+	 * @return an expression part that describes this layout
+	 */
+	public static ExpressionPart makePrimaryExpressionPart( ExpressionPart caller, String function, ExpressionPart[] args ){
+		ExpressionPart ths = new ExpressionPart(){
+			private String compile;
+			@Override
+			public String compilePart() {
+				
+				if( compile == null ){
+					StringBuffer buf = new StringBuffer();
+					ExpressionPart caller = this.getCaller();
+
+				//	else
+				//		buf.append( "$global$" );
+					for(ExpressionPart part : this.getArgs()){
+						buf.append(' ');
+						buf.append( part.compilePart() );
+					}
+					
+					if(caller != null)
+						buf.append( " " + caller.compilePart() );
+					
+					buf.append(' ');
+					if(this.getFunction().trim().length() > 0){
+						if(caller != null){
+							// \u00FF is the marker for what is an instance function
+							buf.append(  "\u00FF" + this.getFunction() );
+						}
+						else{
+							// \u00FE is the marker for a global function
+							buf.append( "\u00FE" + this.getFunction() );
+						}
+					}
+					compile = buf.toString().replaceAll("\\s+", " ");
+				}
+				
+				return compile;
+			}
+		};
+		
+		ths.caller = caller;
+		ths.function = function;
+		ths.args = args;
+		
+		ths.primary = true;
+		
+		return ths;
+	}
+	
+	/**
+	 * This method returns an expression part that is made entirely up
+	 * of one single variable name. On a side note, these parts are the
+	 * recursive base case for the compilation.
+	 * 
+	 * The name of the variable is stored in the function value, as a variable
+	 * name can be thought of as a function that returns that point in
+	 * memory.
+	 * 
+	 * @param name the name of the variable.
+	 * @return A base case ExpressionPart
+	 */
+	public static ExpressionPart makeExpressionPart( String name ){
+		ExpressionPart ths = new ExpressionPart(){
+			@Override
+			public String compilePart() {
+				return this.getFunction();
+			}
+		};
+		ths.function = name;
+		
+		return ths;
+	}
+	
+	/**
+	 * @return the caller
+	 */
+	public ExpressionPart getCaller() {
+		return caller;
+	}
+
+	/**
+	 * @return the args
+	 */
+	public ExpressionPart[] getArgs() {
+		return args;
+	}
+
+	/**
+	 * @return the function
+	 */
+	public String getFunction() {
+		return function;
+	}
+
+	/**
+	 * @return the primary
+	 */
+	public boolean isPrimary() {
+		return primary;
+	}
+
+	public abstract String compilePart();
+}
-- 
cgit