316 lines
11 KiB
Python
316 lines
11 KiB
Python
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# gamesequence.py
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import re as _re
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class SequenceError(RuntimeError):
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pass
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class ScriptBreak(object):
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def __init__(self, value):
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self.value = value
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def getValueFromString(arg: str, env: dict):
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#if env == None:
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#env = self.customValues
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val = None
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validIdent = _re.match(r'[_A-Za-z][_0-9A-Za-z]*', arg)
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if arg[0] in '"\'' and arg[-1] == arg[0]: # assume it's a string
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val = arg[1:-1]
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elif _re.match(r'[+-]?(?:[0-9]*[.])?[0-9]+', arg) != None:
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if '.' in arg:
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val = float(arg)
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else:
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val = int(arg)
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elif arg.casefold() == 'true':
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val = True
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elif arg.casefold() == 'false':
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val = False
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#elif arg.casefold() == 'playerx' and self.player != None:
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# val = self.player.x
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#elif arg.casefold() == 'playery' and self.player != None:
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# val = self.player.y
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#elif arg.casefold() == 'playername' and self.player != None:
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# val = self.player.name
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#elif arg.casefold() == 'playerinv' and self.player != None:
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# val = self.player.inventory
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#elif arg.casefold() == 'playerdesc' and self.player != None:
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# val = self.player.description
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elif validIdent != None and env != None:
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group = validIdent.group()
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if 'scriptLocal' in env and group in env['scriptLocal']:
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val = env['scriptLocal'][group]
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elif group in env['global']:
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val = env['global'][group]
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else:
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return False # for if statements; if a variable doesn't exist, should evaluate to False
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# evaluate all values of all indecies
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openBracket = validIdent.end()
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if openBracket < len(arg):
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if arg[openBracket] == '[':
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ptr = openBracket
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depth = 0
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while ptr < len(arg):
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if depth == 0 and arg[ptr] != '[':
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raise SequenceError('Invalid value syntax: {}'.format(arg))
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if arg[ptr] == '[':
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depth += 1
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elif arg[ptr] == ']':
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depth -= 1
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if depth == 0:
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index = getValueFromString(arg[openBracket+1:ptr], env)
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if index in val:
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val = val[index]
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else:
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return False
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openBracket = ptr + 1
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ptr += 1
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else:
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raise SequenceError('Invalid value syntax: {}'.format(arg))
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else:
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raise SequenceError('Invalid argument to getValueFromString: {}'.format(arg))
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return val
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def compareValues(args: list, env: dict):
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"""Generalized comparisons, may eventually be extended to other operators"""
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if len(args) == 1:
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return bool(getValueFromString(args[0]), env)
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elif len(args) == 3 and args[1] in ('==', '!=', '<=', '>=', '<', '>', 'in'):
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lval = getValueFromString(args[0], env)
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operator = args[1]
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rval = getValueFromString(args[2], env)
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if operator == '==':
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return lval == rval
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elif operator == '!=':
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return lval != rval
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elif operator == '<=':
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return lval <= rval
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elif operator == '>=':
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return lval >= rval
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elif operator == '<':
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return lval < rval
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elif operator == '>':
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return lval > rval
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elif operator == 'in':
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#if args[2].casefold() == 'playerinv':
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# return lval in self.player.thingNames
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#else:
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return lval in rval
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else:
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raise SequenceError("Condition cannot be evaluated: {}".format(' '.join(args)))
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def ifScript(args, env: dict, externalScripts: dict):
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"""If statement: if [not] value [op value] script"""
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if len(args) < 2:
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raise GameError('Incomplete If statement: if {}'.format(' '.join(args)))
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inverse = False
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ret = False
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if args[0] == 'not':
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inverse = True
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args.pop(0)
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if len(args) < 2:
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raise GameError('Incomplete If statement: if {}'.format(' '.join(args)))
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# evaluate condition
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if len(args) > 1 and args[1] in ('==', '!=', '<=', '>=', '<', '>', 'in'):
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if len(args) < 4:
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raise SequenceError('Incomplete If statement: if {}'.format(' '.join(args)))
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ret = compareValues(args[:3], env)
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args = args[3:]
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else:
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ret = bool(getValueFromString(args[0]), env)
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args = args[1:]
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if inverse:
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ret = not ret
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# if condition is true, evaluate further
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if ret:
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if isinstance(args[-1], list):
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return runScript(args[-1], env, externalScripts)
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else:
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return runScript([args], env, externalScripts)
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def getCustomValue(args, env: dict):
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if env == None:
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raise SequenceError("Cannot get a value from an empty environment.")
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return getValueFromString(args[0], env)
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def setCustomValue(args, env: dict):
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"""takes [customValue, op, value]"""
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if env == None:
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raise SequenceError("Cannot set a value from an empty environment.")
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scope = env['scriptLocal']
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if len(args) > 0 and args[0] == 'global':
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scope = env['global']
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args.pop(0)
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if len(args) < 3 or args[1] not in ('=', '+=', '-=', '*=', '/=', '%=', '//=', '**=', 'b=', '!=', '|=', '&=', '^='):
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raise SequenceError('Arguments are not fit for the setCustomValue script.')
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# This next line allows cvmod to use values in the thing's customValues dict,
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# but doing this means that accessing a game CV requires setting it to a local var.
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val = getValueFromString(args[2], env)
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# set the value to a default value (0, 0.0, '', etc.) if not yet assigned
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if args[0] not in scope and args[1] != '=':
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if isinstance(val, int):
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scope[args[0]] = 0
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elif isinstance(val, float):
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scope[args[0]] = 0.0
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elif isinstance(val, str):
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scope[args[0]] = ''
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elif isinstance(val, bool):
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scope[args[0]] = False
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# Beyond this point are types that can only be found from other customValues
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elif isinstance(val, tuple):
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scope[args[0]] = ()
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elif isinstance(val, list):
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scope[args[0]] = []
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elif isinstance(val, dict):
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scope[args[0]] = {}
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else:
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raise SequenceError("Operation not supported for unassigned custom values of type {}: {}"
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.format(type(val), args[1]))
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# done parsing, evaluate
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if args[1] == '=':
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scope[args[0]] = val
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elif args[1] == '+=':
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scope[args[0]] += val
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elif args[1] == '-=':
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scope[args[0]] -= val
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elif args[1] == '*=':
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scope[args[0]] *= val
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elif args[1] == '/=':
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scope[args[0]] /= val
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elif args[1] == '%=':
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scope[args[0]] %= val
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elif args[1] == '//=':
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scope[args[0]] //= val
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elif args[1] == '**=':
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scope[args[0]] **= val
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elif args[1] == 'b=':
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scope[args[0]] = bool(val)
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elif args[1] == '!=':
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scope[args[0]] = not bool(val)
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elif args[1] == '|=':
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scope[args[0]] |= val
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elif args[1] == '&=':
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scope[args[0]] &= val
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elif args[1] == '^=':
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scope[args[0]] ^= val
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return scope[args[0]]
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def delCustomValue(args, env: dict):
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"""To clean up after a map."""
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if env == None:
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raise SequenceError("Cannot delete a value from an empty environment.")
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for i in args:
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if i in env['global']:
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del(env['global'][i])
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_requireEnv = {'get' : getCustomValue, 'set' : setCustomValue, 'del' : delCustomValue}
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_requireScripts = {'if' : ifScript}
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def runScript(script: list, env: dict, externalScripts: dict):
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"""run a script"""
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ret = False
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for line in script:
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if len(line) == 0:
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# empty line
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continue
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elif line[0].casefold() == 'playercmd':
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# run a player command
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self.getIO('playercmd')(line[1:])
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elif line[0].casefold() in _requireScripts:
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ret = _requireScripts[line[0]](line[1:], env, externalScripts)
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elif line[0].casefold() in _requireEnv:
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ret = _requireEnv[line[0]](line[1:], env)
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elif line[0].casefold() == 'break':
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# exit early
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return _ScriptBreak(ret)
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elif line[0] in externalScripts:
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# run a script
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ret = externalScripts[line[0]](line[1:])
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else:
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# conditional evaluation
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compareValues(line, env)
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if isinstance(ret, ScriptBreak):
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return ret
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# We specifically want the return value of the last line executed.
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return ret
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def parseScript(instr: str, envGlobal: dict, externalScripts: dict):
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"""parses then runs a script."""
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#print('parseScript called with {}.'.format(instr))
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if instr == '':
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return # nothing to be done.
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literalStr = list(instr)
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inQuotes = False
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script = []
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stack = []
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ret = []
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argStart = 0
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c = 0
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l = 0
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while c < len(instr):
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if inQuotes:
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if instr[c] == '"':
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if instr[c-1] == '\\':
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del literalStr[l-1]
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l -= 1
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else:
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inQuotes = False
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del literalStr[l]
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l -= 1
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else:
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if instr[c] == '"': # quoted string
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if l > 0 and instr[c-1] == '\\':
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del literalStr[l-1]
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l -= 1
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else:
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inQuotes = True
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del literalStr[l]
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l -= 1
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elif instr[c] in ' \t\n;}{':
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if l > 0 and instr[c-1] == '\\':
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del literalStr[l-1]
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l -= 1
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else:
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if argStart != l:
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ret.append(''.join(literalStr[argStart:l]))
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if instr[c] == ';':
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if len(ret) > 0:
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script.append(ret)
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ret = []
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elif instr[c] == '{': # block
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stack.append(script)
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script.append(ret)
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script = []
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ret.append(script)
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ret = []
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del literalStr[l]
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l -= 1
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elif instr[c] == '}': # close block
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if len(ret) > 0:
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script.append(ret)
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ret = []
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script = stack.pop()
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del literalStr[l]
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l -= 1
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argStart = l + 1
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c += 1
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l += 1
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if argStart != l:
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ret.append(''.join(literalStr[argStart:l]))
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if len(ret) > 0:
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script.append(ret)
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#print('After parsing: {}'.format(script))
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env = {'global' : envGlobal, 'scriptLocal' : {}}
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#self.customValues['scriptLocal'] = {}
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ret = runScript(script, env, externalScripts)
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if isinstance(ret, ScriptBreak):
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ret = ret.value
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return ret
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