25964491dd
- fix commands - import DataTables - initial category view Signed-off-by: Corentin Chary <corentincj@iksaif.net>
30 lines
1.2 KiB
Python
30 lines
1.2 KiB
Python
from django.template import Node, Library
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import math
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register = Library()
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# taken from http://lybniz2.sourceforge.net/safeeval.html
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# make a list of safe functions
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math_safe_list = ['acos', 'asin', 'atan', 'atan2', 'ceil', 'cos', 'cosh', 'degrees', 'e', 'exp', 'fabs', 'floor', 'fmod', 'frexp', 'hypot', 'ldexp', 'log', 'log10', 'modf', 'pi', 'pow', 'radians', 'sin', 'sinh', 'sqrt', 'tan', 'tanh']
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# use the list to filter the local namespace
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math_safe_dict = dict([(k, getattr(math, k)) for k in math_safe_list])
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# add any needed builtins back in.
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math_safe_dict['abs'] = abs
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@register.filter('math')
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def math_(lopr, expr):
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"""Evals a math expression and returns it's value.
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"$1" is a placeholder. Insert "$1" in the expression where the value is to be used. All math functions such as abs, sin, cos, floor are supported.
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Example,
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a. You will be redirected in {{ seconds|math:"$1 / 60.0" }} minutes
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b. Square of {{ x }} is {{ x|math:"$1 * $1" }}
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c. Square root of {{ x }} is {{ x|math:"sqrt($1)" }}
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d. Given x = {{ x }}, (2 + x) * 6 = {{ x|math:"(2 + $1) * 6" }}
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"""
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if lopr:
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return eval(expr.replace('$1', str(lopr)), {"__builtins__": None}, math_safe_dict)
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return ''
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