A minimal DSL for Python
Minilanguage
is a minimal DSL for Python written with Ply.
Is it intended to be a starting point for writing more specific DSLs.
Currently, it only implements simple boolean logic and objects/strings evaluation.
from minilanguage.grammar import Parser
context = {
'country': 'US',
'user': {
'username': 'regular_user',
'data_bag': {
"payload": 'abc',
}
}
}
parser = Parser()
parser.build()
parser.evaluate("2 + 0.5", context)
# 2.5
parser.evaluate("12 + 12", context)
# 24
parser.evaluate("12 == 12", context)
# True
parser.evaluate("12 != 12", context)
# False
parser.evaluate("12 and False", context)
# False
parser.evaluate("12 or False", context)
# 12
parser.evaluate("12 > 10", context)
# True
parser.evaluate("12 < 10", context)
# False
parser.evaluate("12 <= 12", context)
# True
parser.evaluate("12 >= 12", context)
# True
parser.evaluate("country", context)
# 'US'
parser.evaluate("country == 'US'", context)
# True
parser.evaluate("user['username']", context)
# 'regular_user'
parser.evaluate("'a', 'b'", context)
# tuple('a', 'b')
parser.evaluate("user['data_bag']['payload']", context)
# 'abc'
parser.evaluate("user.get('missing_key', 'default')", context)
# 'default'
parser.evaluate("12 if False else 14", context)
# 14
This software is released under the MIT License.