Brainfuck to C Transpiler

bf2c.py

import sys

symbols = {
	'>' : '++ptr;',
	'<' : '--ptr;',
	'+' : '++*ptr;',
	'-' : '--*ptr;',
	'.' : 'putchar(*ptr);',
	',' : '*ptr = getchar();',
	'[' : 'while(*ptr) {',
	']' : '}'
}

with open(sys.argv[1]) as infile, open(sys.argv[2], 'w') as outfile:
	# indent output lines of C code
	depth = 1;

	# C program boilerplate
	outfile.write("#include <stdio.h>\n")
	outfile.write("int main() {\n")
	outfile.write("\tchar array[%s] = {0};\n" % sys.argv[3])
	outfile.write("\tchar *ptr=array;\n")
	
	# convert BF operations to equivalent C operation
	for line in infile:
		for char in line:
			try:
				outfile.write("\t" * depth)
				outfile.write(symbols[char])
				depth += char == '['
				depth -= char == ']'
				outfile.write("\n")
			except: # unrecognized symbols in BF are comments. Print for debug purposes
				print char,
				
	outfile.write("}\n");