#! python 2.7
"""
V: 0.0.1 Test Build
Easy As Py
easyPyCompiler.py
Last edit was: Sunday, December 11, 2016
Jacob DiDiodato
A python-based interpreter for very novice programmers
Probably pretty slow and error-prone
Should write to a temporary python file and run it with syntax error checking
A very space-minded language

My apologies about not much commenting. I think a lot of this is fairly self-explainatory. If people want it then I'll add it later

My attempt at writing a compiler without an AST (just text verification)
"""

#Includes pygame and random natively! Thats fun!
import pygame
from random import *
import os,sys

dQuote = '"'
sQuote = "'"

#Words and symbols you can't use in var names
keyWords = ["print", "set", "to", "random", "add", "False", "None", "True", "and", "as", "assert", "break", "class", "continue", "def", "del", "elif", "else", "except", "finally", "for", "from", "global", "if", "import", "in", "is", "lambda", "nonlocal", "not", "or", "pass", "raise", "return", "try", "while", "with", "yield"]
keyChars = ['~', '`', '!', '@', '#', '$', '%', '^', '&', '*', '(', ')', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '-', '+', '=', '{', '[', '}', ']',
			':', ';', dQuote, sQuote, '<', ',', '>', '.', '?', '/', '|', '\\']
			
def generateRandom(commands):
	exclusive = False
	try:
		commands[3]
	except IndexError:
		exclusive = True
	else:
		if (commands[3] == "e"):
			exclusive = True
	return "randint(" + str(commands[0]) + ", " + str(commands[2]) + " - " + str(int(exclusive)) + ")"

def checkRandomNum(commands, lineNo, globalVars):
	if (commands[1] == "to"):
		if (globalVars.get(commands[0]) != None):
			commands[0] = globalVars.get(commands[0])
		if (globalVars.get(commands[2]) != None):
			commands[2] = globalVars.get(commands[2])
		try:
			int(commands[0])
			int(commands[2])
		except ValueError:
			print "Line " + str(lineNo + 1) + "\nValueError: [easyPyError #4] One of the numbers you have entered cannot be converted to an integer."
			return -1
		else:
			if (int(commands[2]) < int(commands[0])):
				print "Line " + str(lineNo + 1) + "\nRandomError: [easyPyError #5] Your second number in range is larger than your first number in range.\nConsider switching them."
				return -1
			else:
				return generateRandom(commands)
	else:
		print "Line " + str(lineNo + 1) + "\nFormattingError: [easyPyError #3] Missing word 'to'.\nFormat random number like: 'random num1 to num2 (i/e)'."
		return -1
		
def addition(commands):
	return str(commands[0]) + "+" + str(commands[2])

def checkAddNum(commands, lineNo, globalVars):
	if (commands[1] == "to"):
		if (globalVars.get(commands[0]) != None):
			commands[0] = globalVars.get(commands[0])
		if (globalVars.get(commands[2]) != None):
			commands[2] = globalVars.get(commands[2])
		try:
			int(commands[0])
			int(commands[2])
		except ValueError:
			print "Line " + str(lineNo + 1) + "\nValueError: [easyPyError #4] One of the numbers you have entered cannot be converted to an integer."
			return -1
		else:
			return addition(commands)
	else:
		print "Line " + str(lineNo + 1) + "\nFormattingError: [easyPyError #3] Missing word 'to'.\nFormat addition like: 'add num1 to num2'."
		return -1
		
def subtract(commands):
	return str(commands[0]) + "-" + str(commands[2])

def checkSubNum(commands, lineNo, globalVars):
	if (commands[1] == "from"):
		if (globalVars.get(commands[0]) != None):
			commands[0] = globalVars.get(commands[0])
		if (globalVars.get(commands[2]) != None):
			commands[2] = globalVars.get(commands[2])
		try:
			int(commands[0])
			int(commands[2])
		except ValueError:
			print "Line " + str(lineNo + 1) + "\nValueError: [easyPyError #4] One of the numbers you have entered cannot be converted to an integer."
			return -1
		else:
			return subtract(commands)
	else:
		print "Line " + str(lineNo + 1) + "\nFormattingError: [easyPyError #3] Missing word 'from'.\nFormat subtraction like: 'subtract num1 from num2'."
		return -1

def interpret(srcText):
	#the container for all global variables in the code
	globalVars = {}
	runningTab = ""
	open("pySource.py", "w").close()
	pySource = open("pySource.py", "a")
	pySource.write("#! python2.7\n#Compiled with the Easy As Py Compiler\n\nimport pygame\nfrom random import *\n\n")
	line = len(srcText)
	for i in range(line):
		commands = srcText[i].split(" ")
		#To print a string/variable
		if (commands[0] == "print"):
			pySource.write("print ")
			#If i am printing a variable check if that variable exists
			#If it does then i print it but if it doesnt then i just print the word instead
			if (globalVars.get(commands[1]) != None):
				pySource.write(runningTab + commands[1] + "\n")
			elif (commands[1] == "random"):
				if (checkRandomNum(commands[2:], i, globalVars) != -1):
					pySource.write(runningTab + checkRandomNum(commands[2:], i, globalVars) + "\n")
				else:
					break
			elif (commands[1] == "add"):
				if (checkAddNum(commands[2:], i, globalVars) != -1):
					pySource.write(runningTab + checkAddNum(commands[2:], i, globalVars) + "\n")
				else:
					break
			elif (commands[1] == "subtract"):
				if (checkSubNum(commands[2:], i, globalVars) != -1):
					pySource.write(runningTab + checkSubNum(commands[2:], i, globalVars) + "\n")
				else:
					break
			#If i am printing a string
			else:
				#Print the contents of the string
				pySource.write(runningTab + dQuote + " ".join(commands[1:]) + dQuote + "\n")
		#To set a variable
		elif (commands[0] == "set"):
			#Checking syntax
			if (commands[2] == "to"):
				badVar = False
				for j in range(len(keyChars)):
					for k in range(len(commands[1])):
						if (commands[1][k] == keyChars[j]):
							print(commands[1][k])
							print "Line " + str(i + 1) + "\nVariableNameError: [easyPyError #6] Invalid variable name.\nThe character '" + keyChars[j] + "' can't be used in a variable name."
							badVar = True
							
				for j in range(len(keyWords)):
					if (commands[1] == keyWords[j]):
						print "Line " + str(i + 1) + "\nVariableNameError: [easyPyError #6] Invalid variable name.\nThe word '" + keyWords[j] + "' is special and can't be used in a variable name."
						badVar = True
						
				if (badVar == True):
					break
					
				#Set our variable internally in a sort of RAM
				#I use a dictionary to specify an arbitrarily large amount of RAM
				#Write it into python code
				if (commands[3] == "random"):
					if (checkRandomNum(commands[4:], i, globalVars) != -1):
						exclusive = False
						try:
							commands[7]
						except IndexError:
							exclusive = True
						else:
							if (commands[7] == "e"):
								exclusive = True
						if (globalVars.get(commands[4]) != None):
							commands[4] = globalVars.get(commands[4])
						if (globalVars.get(commands[6]) != None):
							commands[6] = globalVars.get(commands[6])
						randVar = randint(int(commands[4]), int(commands[6]) - int(exclusive))
						globalVars[commands[1]] = randVar
						pySource.write(runningTab + commands[1] + "=" + str(globalVars[commands[1]]) + "\n")
					else:
						break
				elif (commands[3] == "add"):
					if (checkAddNum(commands[4:], i, globalVars) != -1):
						globalVars[commands[1]] = int(commands[4]) + int(commands[6])
						pySource.write(runningTab + commands[1] + "=" + str(checkAddNum(commands[4:], i, globalVars)) + "\n")
					else:
						break
				elif (commands[3] == "subtract"):
					if (checkSubNum(commands[4:], i, globalVars) != -1):
						globalVars[commands[1]] = int(commands[4]) - int(commands[6])
						pySource.write(runningTab + commands[1] + "=" + str(checkSubNum(commands[4:], i, globalVars)) + "\n")
					else:
						break
				else:
					try:
						globalVars[commands[1]] = int(commands[3]);
						pySource.write(runningTab + commands[1] + "=" + str(globalVars[commands[1]]) + "\n")
					except ValueError:
						globalVars[commands[1]] = commands[3];
						pySource.write(runningTab + commands[1] + "=" + dQuote + globalVars[commands[1]] + dQuote + "\n")
			else:
				#If we are missing some syntax
				print "Line " + str(i + 1) + "\nFormattingError: [easyPyError #3] Missing word 'to'.\nFormat varible setting like: 'set varName to value'."
				break
		elif (commands[0] == "random"):
			pySource.write(runningTab + checkRandomNum(commands[1:], i, globalVars))
		elif (commands[0] == "add"):
			pySource.write(runningTab + checkAddNum(commands[1:], i, globalVars))
		elif (commands[0] == "subtract"):
			pySource.write(runningTab + checkSubNum(commands[1:], i, globalVars))
		elif (commands[0] == "!"):
			pySource.write("#" + " ".join(commands[1:]) + "\n")
		elif (commands[0] == ""):
			pass
		#If the first token is not recognized by the compiler
		else:
			print "Line " + str(i + 1) + "\nSyntaxError: [easyPyError #2] Token or function '" + str(commands[0] + "' does not exist.\nTake a look at the first word of line " + str(i + 1) + " to see if thats what you meant to type.")
			pySource.close()
			os.remove("pySource.py")
			return -1
	pySource.close()
	os.system("python pySource.py")
	#Keep the following line in the release build
	#os.remove("pySource.py")
	return 0

def openFile():
	#Get the filename from the command line arguments
	filename = str(sys.argv[1])

	#Check to see if the file exists
	try:
		#Open the file
		src = open(filename, "r")
	except IOError:
		#Give a very English defintion of the error
		print "Line 0\nFileNameError: [easyPyError #1] That file does not exist.\nTry naming the file something like: '" + str(sys.argv[1].split(".")[0]) + ".easyPy'"
	else:
		srcText = src.read().split("\n")
		interpret(srcText)
	
def main():
	openFile()
	
main()