105 lines
3.3 KiB
Python
105 lines
3.3 KiB
Python
# -*- coding: utf8 -*-
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"""
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.. module:: lesscpy.plib.deferred
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:synopsis: Deferred mixin call.
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Copyright (c)
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See LICENSE for details.
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.. moduleauthor:: Jóhann T. Maríusson <jtm@robot.is>
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"""
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from .node import Node
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from lesscpy.lessc import utility
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class Deferred(Node):
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def __init__(self, mixin, args, lineno=0, caller=None):
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"""This node represents mixin calls. The calls
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to these mixins are deferred until the second
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parse cycle. lessc.js allows calls to mixins not
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yet defined or known.
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args:
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mixin (Mixin): Mixin object
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args (list): Call arguments
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"""
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self.tokens = [mixin, args]
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self.lineno = lineno
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self.caller = caller
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def parse(self, scope, error=False):
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""" Parse function. We search for mixins
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first within current scope then fallback
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to global scope. The special scope.deferred
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is used when local scope mixins are called
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within parent mixins.
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If nothing is found we fallback to block-mixin
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as lessc.js allows calls to blocks and mixins to
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be inter-changable.
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clx: This method is a HACK that stems from
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poor design elsewhere. I will fix it
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when I have more time.
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args:
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scope (Scope): Current scope
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returns:
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mixed
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"""
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res = False
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ident, args = self.tokens
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ident.parse(scope)
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mixins = scope.mixins(ident.raw())
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if not mixins:
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ident.parse(None)
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mixins = scope.mixins(ident.raw())
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if not mixins:
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if scope.deferred:
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store = [t for t in scope.deferred.parsed[-1]]
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while scope.deferred.parsed[-1]:
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scope.current = scope.deferred
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ident.parse(scope)
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mixins = scope.mixins(ident.raw())
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scope.current = None
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if mixins:
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break
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scope.deferred.parsed[-1].pop()
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scope.deferred.parsed[-1] = store
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if not mixins:
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# Fallback to blocks
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block = scope.blocks(ident.raw())
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if not block:
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ident.parse(None)
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self.caller.parse(None)
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block = scope.blocks(ident.raw())
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if block:
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scope.current = self.caller
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res = block.copy_inner(scope)
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scope.current = None
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if mixins:
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for mixin in mixins:
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res = mixin.call(scope, args)
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if res:
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# Add variables to scope to support
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# closures
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[scope.add_variable(v) for v in mixin.vars]
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scope.deferred = ident
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break
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if res:
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res = [p.parse(scope) for p in res if p]
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while(any(t for t in res if type(t) is Deferred)):
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res = [p.parse(scope) for p in res if p]
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if error and not res:
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raise SyntaxError('NameError `%s`' % mixin.raw(True))
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return res
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def copy(self):
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""" Returns self (used when Block objects are copy'd)
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returns:
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self
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"""
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return self
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