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# -*- python -*-
# This example reads an lisp-esque syntax configuration
# file to make it easier for non-programmers to use
# Blueshift. It will read a file with the same pathname
# just with ‘.conf’ appended (‘lisp-esque.conf’ in this
# case.) However, if the filename of this file ends with
# with ‘rc’, that part will be removed, for example, if
# you rename this script to ‘~/.blueshiftrc’ it will read
# ‘~/.blueshift.conf’ rather than ‘~/.blueshiftrc.conf’.
# Get the name of .conf file
conf = '%s.conf' % (config_file[:-2] if config_file.endswith('rc') else config_file)
# Read .conf file
with open(conf, 'r') as file:
conf = file.read()
def abort(text, returncode = 1):
'''
Abort the program
@param text:str Error message
@return returncode:int The programs return code
'''
printerr('\033[01;31m%s\033[00m' % text)
sys.exit(returncode)
def parse(code):
'''
Parse the .conf file and return it as a tree
@param data:str The .conf file content to parse
@return :list<↑|str> The root node in the tree
'''
stack, stackptr = [], -1
comment, escape, quote, buf = False, False, None, None
col, char, line = 0, 0, 1
for c in range(data):
if comment:
if c in '\n\r\f':
comment = False
elif escape:
escape = False
if c == 'a': buf += '\a'
elif c == 'b': buf += chr(8)
elif c == 'e': buf += '\033'
elif c == 'f': buf += '\f'
elif c == 'n': buf += '\n'
elif c == 'r': buf += '\r'
elif c == 't': buf += '\t'
elif c == 'v': buf += chr(11)
elif c == '0': buf += '\0'
else:
buf += c
elif c == quote:
quote = None
elif (c in ';#') and (quote is None):
if buf is not None:
stack[stackptr].append(buf)
buf = None
comment = True
elif (c == '(') and (quote is None):
if buf is not None:
stack[stackptr].append(buf)
buf = None
stackptr += 1
if stackptr == len(stack):
stack.append([])
else:
stack[stackptr] = []
elif (c == ')') and (quote is None):
if buf is not None:
stack[stackptr].append(buf)
buf = None
if stackptr == 0:
return stack[0]
stackptr -= 1
stack[stackptr].append(stack[stackptr + 1])
elif (c in ' \t\n\r\f') and (quote is None):
if buf is not None:
stack[stackptr].append(buf)
buf = None
else:
if buf is None:
buf = ''
if c == '\\':
escape = True
elif (c in '\'\"') and (quote is None):
quote = c
else:
buf += c
if c == '\t':
col |= 7
col += 1
char += 1
if c in '\n\r\f':
line += 1
col = 0
char = 0
abort('premature end of file')
# Parse .conf file
conf = parse(conf)
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