pb.py

#!/usr/bin/env python

import sys
import time

varstore = {}
errorcount = 0
warningcount = 0

def main():
    print("ParseBasic interpreter v0.1.1")
    print("Copyright 2015 NETponents")
    print("Licensed under MIT license")
    print("Commercial use of this build is prohibited")
    print("============================================")
    print(" ")
    print("Setting up debugger")
    errorcount = 0
    warningcount = 0
    print("Creating virtual filesystem")
    startpath = "./bootloader/boot.pba"
    if sys.argv[1]:
        startpath = sys.argv[1]
    startRead(startpath)
        
def startRead(filepath):
    print("Opened file " + filepath)
    fileHandle = open(filepath, 'r')
    fileHandle.seek(0)
    for line in fileHandle:
        line = line.replace("/n", "").strip()
        if ";" in line:
            print(".")
        else:
            print("ERROR: missing semicolon")
        line = line.replace(";", "")
        if line.startswith("//"):
            # Do nothing, this is a comment
            print("Comment found")
        elif line.startswith("PRINT"):
            line = line.replace("PRINT", "").replace('"',"").strip()
            print(line)
        elif line.startswith("NEWPRINT"):
            print('\n')
        elif line.startswith("WAIT"):
            time.sleep(int(line.split(" ")[1]) / 1000)
        elif line.startswith("CREATESWAP"):
            print("Initialized SWAP space")
        elif line.startswith("IO"):
            cmds = line.split()
            print("IO port " + cmds[1] + " has a status of " + cmds[2])
        elif line.startswith("NEW"):
            cmds = line.split()
            try:
                varstore[cmds[1].replace("$","")]
                print("ERROR: variable " + cmds[1] + " already exists.")
                errorcount += 1
            except: 
                varstore[cmds[1].replace("$","")] = str(line.replace("NEW","").replace(cmds[1],"").strip())
                pass
        elif line.startswith("DELETE"):
            try:
                del varstore[line.split()[1].replace("$","").strip()]
            except:
                print("ERROR: variable " + line.split()[1] + " is not defined.")
                errorcount += 1
                pass
        elif line.startswith("SET"):
            try:
                varstore[line.split()[1].replace("$","").strip()] = line.replace("SET","").replace(line.split()[1],"").strip()
            except:
                print("ERROR: variable " + line.split()[1] + " is not defined.")
                errorcount += 1
                pass
        elif line.startswith("EXTLOAD"):
            startRead("." + line.replace("EXTLOAD","").strip())
        elif line.startswith("FILEWRITE"):
            line = line.replace("FILEWRITE","").strip()
            fname = line.split(" ")
            filehandler = open("." + fname[0], 'w')
            filehandler.write(line.replace(fname[0], "").strip())
            filehandler.close();
        elif line.startswith("FILEREAD"):
            cmd2 = line.split(" ")
            fhandle = open("." + cmd2[1])
            text = fhandle.read()
            try:
                varstore[cmd2[2].replace("$","").strip()] = text
            except:
                print("ERROR: variable " + cmd2[2] + " is not defined.")
                errorcount += 1
                pass
        elif line.startswith("FILERM"):
            print("ERROR: Not supported yet")
        elif line.startswith("END"):
            print("Program has quit. Exiting.")
            fileHandle.close
            #print "Errors: " + str(errorcount)
            #print "Warnings: " + str(warningcount)
            #sys.exit(errorcount)
            sys.exit(0)
        else:
            print("ERROR: Unknown command in file " + filepath)
            errorcount += 1
    fileHandle.close

if __name__ == '__main__':
    main()