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Append.py
48 lines (41 loc) · 1.75 KB
/
Append.py
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from __future__ import print_function
# Copyright (C) 2007-2010 Samuel Abels.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2, as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
from Exscript.parselib import Token
from Exscript.interpreter.Term import Term
class Append(Token):
def __init__(self, lexer, parser, parent):
Token.__init__(self, 'Append', lexer, parser, parent)
# First expect an expression.
lexer.expect(self, 'keyword', 'append')
lexer.expect(self, 'whitespace')
self.expr = Term(lexer, parser, parent)
# Expect "to" keyword.
lexer.expect(self, 'whitespace')
lexer.expect(self, 'keyword', 'to')
# Expect a variable name.
lexer.expect(self, 'whitespace')
_, self.varname = lexer.token()
lexer.expect(self, 'varname')
self.parent.define(**{self.varname: []})
self.mark_end()
def value(self, context):
existing = self.parent.get(self.varname)
args = {self.varname: existing + self.expr.value(context)}
self.parent.define(**args)
return 1
def dump(self, indent = 0):
print((' ' * indent) + self.name, "to", self.varname)
self.expr.dump(indent + 1)