#!/usr/bin/env python
import os, sys
import pprint
def import_module(name, path):
import imp
try:
mod_fp, mod_path, mod_desc = imp.find_module(name, [path])
mod = getattr( imp.load_module(name, mod_fp, mod_path, mod_desc), name )
except ImportError as exc:
mod = None
sys.stderr.write("Error: failed to import module ({})".format(exc))
finally:
if mod_fp: mod_fp.close()
return mod
# import the GrammarTemplate.py engine (as a) module, probably you will want to place this in another dir/package
GrammarTemplate = import_module('GrammarTemplate', os.path.join(os.path.dirname(__file__), '../src/python/'))
if not GrammarTemplate:
print ('Could not load the GrammarTemplate Module')
sys.exit(1)
else:
pass
def echo( s='' ):
print (s)
echo('GrammarTemplate.VERSION = ' + GrammarTemplate.VERSION)
echo('GrammarTemplate POST-OP Mode')
echo( )
#
# i.e:
# foreach "expression:terms" as "term":
# foreach "term:factors" as "factor":
# ..
#
# here an :EXPR template is defined which itself uses (anonymous) sub-templates
# it is equivalent to (expand sub-templates to distinct):
#
#<:FACTOR>:=[<lhs>[ <op>? <rhs|NULL>]]
#
#<:TERM>:=[(<factor:FACTOR>[ AND <factor:FACTOR>*])]
#
#<:EXPR>:=[<term:TERM>[ OR <term:TERM>*]]
#
#<expression:EXPR>
#<expression2:EXPR>
#
#
tpl = "<:EXPR>:=[<term>:=[(<factor>:=[<globalNegation:NEG><lhs>[ <op:OP>? <rhs|NULL>]][ AND <factor>*])][ OR <term>*]]<expression:EXPR>\n<expression2:EXPR>\n<foo:FOO>?<foo:FOO>\\?<foo:FOO> ?"
def op_func( val, *rest ):
return '<>' if '!=' == val else val
def neg_func( val, *rest ):
return 'NOT ' if val else ''
def foo_func( val, *rest ):
return 'foo'
expr = GrammarTemplate(tpl, None, True) # post-op mode
GrammarTemplate.fnGlobal['NEG'] = neg_func
GrammarTemplate.fnGlobal['FOO'] = foo_func
expr.fn['OP'] = op_func
echo("input template:")
echo(tpl)
echo( )
echo("output:")
echo(expr.render({
'globalNegation': False,
'expression' : [
# term
[
# factor
{'lhs': 1, 'op': '=', 'rhs': 1},
# factor
{'lhs': 1, 'op': '=', 'rhs': 2},
# factor
{'lhs': 1, 'op': '=', 'rhs': 3}
],
# term
[
# factor
{'lhs': 1, 'op': '<', 'rhs': 1},
# factor
{'lhs': 1, 'op': '<', 'rhs': 2},
# factor
{'lhs': 1, 'op': '<', 'rhs': 3}
],
# term
[
# factor
{'lhs': 1, 'op': '>', 'rhs': 1},
# factor
{'lhs': 1, 'op': '>', 'rhs': 2},
# factor
{'lhs': 1, 'op': '>', 'rhs': 3}
]
],
'expression2' : [
# term
[
# factor
{'lhs': 2, 'op': '=', 'rhs': 1},
# factor
{'lhs': 2, 'op': '=', 'rhs': 2},
# factor
{'lhs': 2, 'op': '=', 'rhs': 3}
],
# term
[
# factor
{'lhs': 2, 'op': '<', 'rhs': 1},
# factor
{'lhs': 2, 'op': '<', 'rhs': 2},
# factor
{'lhs': 2, 'op': '<', 'rhs': 3}
],
# term
[
# factor
{'lhs': 2, 'op': '>', 'rhs': 1},
# factor
{'lhs': 2, 'op': '>', 'rhs': 2},
# factor
{'lhs': 2, 'op': '>', 'rhs': 3}
],
# term
[
# factor
{'lhs': 3},
# factor
{'lhs': 3, 'op': '!='}
]
]
}))
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