#!/usr/bin/env python
# -*- coding: UTF-8 -*-
#
# Copyright 2016-2019 European Commission (JRC);
# Licensed under the EUPL (the 'Licence');
# You may not use this work except in compliance with the Licence.
# You may obtain a copy of the Licence at: http://ec.europa.eu/idabc/eupl
"""
It provides Function classes.
"""
# noinspection PyCompatibility
import regex
import functools
from . import Token
from .parenthesis import Parenthesis
[docs]class Function(Token):
_re = regex.compile(r'^\s*@?(?P<name>[A-Z_][\w\.]*)\(\s*', regex.IGNORECASE)
[docs] def ast(self, tokens, stack, builder, check_n=lambda *args: True):
super(Function, self).ast(tokens, stack, builder)
stack.append(self)
t = Parenthesis('(')
t.attr['check_n'] = check_n
t.ast(tokens, stack, builder)
[docs] def compile(self):
from formulas.functions import get_functions
return get_functions()[self.name.upper()]
[docs] def set_expr(self, *tokens):
args = ', '.join(t.get_expr for t in tokens)
self.attr['expr'] = '%s(%s)' % (self.name.upper(), args)
def _check_tkn_n_args(n_args, token):
return token.n_args == n_args
[docs]class Array(Function):
_re = regex.compile(r'^\s*(?P<name>(?P<start>{)|(?P<end>})|(?P<sep>;))\s*')
[docs] def ast(self, tokens, stack, builder, check_n=lambda t: t.n_args):
if self.has_start:
Function('ARRAY(').ast(tokens, stack, builder, check_n=check_n)
Function('ARRAY(').ast(tokens, stack, builder, check_n=check_n)
else:
token = Parenthesis(')')
token.ast(tokens, stack, builder)
if self.has_sep:
check_n = functools.partial(_check_tkn_n_args, token.get_n_args)
Function('ARRAY(').ast(tokens, stack, builder, check_n=check_n)
else:
Parenthesis(')').ast(tokens, stack, builder)