Methods.java

import java.util.ArrayList;
import java.util.Scanner;

/**
 * Methods
 * Code for executing elvish methods
 *
 * @author CC Coding Club
 * @version 0.4
 */
public class Methods
{
    Scanner scan = new Scanner(System.in);
    
    /**
     * Elvish method for displaying to console
     *
     * @param code the entire .elv file
     * @param lParenLoc location of the ( before the @show argument to be printed
     * @param variables list of variables and their contents in case one appears in arg
     */
    public void show(String code, int lParenLoc, ArrayList<Variable> variables)
    {
        String arg = "";
        String finalString = "";
        int    pointer = lParenLoc;
        
        //find second quote symbol:
        int rParenLoc = code.indexOf(")", lParenLoc + 1);
        
        //get the argument being sent to show()
        String contents = code.substring(lParenLoc + 1, rParenLoc);        
        boolean inString = false;
        boolean inVariable = false;
               
        String varName = "";
        //loop through all characters, finding Strings or String variables:
        for(int i = 0; i < contents.length(); i++)
        {
            //find characters between quotes:
            String c = contents.substring(i, i + 1);

            //if not a quote, add to String:
            if(inString && !c.equals("\"")) arg += c;
            
            if(c.equals("\"") && !inString)
            {
                inString = true;  //beginning of String
            }
            else if(c.equals("\"") && inString)
            {
                inString = false;
            }
            //start or inside of variable name:
            else if(Character.isAlphabetic(c.charAt(0)))
            {
                //variable name starting:
                if(!inVariable)
                {
                    inVariable = true;
                    varName = c;
                }
                else //adding to variable name:
                {
                    varName += c;
                }
                
                if(i == contents.length() - 1)
                {
                    //loop through all variables, checking .name
                    for(Variable v : variables)
                    {
                        if(v.name.equals(varName)) //found the variable object
                        {
                           System.out.print(arg);
                            arg += v.contents;
                        }
                    }
                }
            }
            //reached end of variable name:
            else if(inVariable)
            {
                //loop through all variables, checking .name
                for(Variable v : variables)
                {                
                    if(v.name.equals(varName)) //found the variable object
                    {                       
                        arg += v.contents;
                    }
                }
                
                inVariable = false;
            }
        }
        
        System.out.println(arg);
    }

    /**
     * displays message and returns user input
     * 
     * @param code the entire elvish file
     * @param mostRecentPipeLoc location of end of previous line of code
     * @param variables list of variables and their contents
     * @param lParenLoc location of start of message argument
     * 
     * POSTCONDITION: variable has been added with contents
     * TODO: take into account, variable might already have been declared!!!
     */
    public void get(String code, int mostRecentPipeLoc, 
                    int pointer, ArrayList<Variable> variables, int lParenLoc)
    {
        //find the =, which implies variable assignment:
        int equalsLoc = code.indexOf('=', mostRecentPipeLoc);
        
        //determine variable name:
        String var1name = code.substring(mostRecentPipeLoc, equalsLoc).trim(); 

        //find end of argument to be printed:
        int     endQuoteLoc = code.indexOf("\"", lParenLoc + 2);
        String  arg = code.substring(pointer + 2, endQuoteLoc);
        boolean varExists = false;
        
        System.out.println(arg);
        
        //wait for user input:
        String var1 = scan.nextLine();
        
        //check if variable already exists:
        for(Variable v : variables)
        { 
            //change contents of variable:
            if(v.name.equals(var1name.substring(1, var1name.length())))
            {    
               varExists = true;
               v.contents = var1;
            }
        }
        
        //create new variable:
        if(!varExists)
        {
            Variable v;
        
            //if variable is a number
            if(Character.isDigit(var1.charAt(0)))
            {
               v = new Variable(var1name, var1, "num");
            }
            //if variable is a string
            else
            {
               v = new Variable(var1name, var1, "string");
            }
               
            variables.add(v);
        }
    }
}