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#
# Copyright Capita Translation and Interpreting 2013
#
# This file is part of Pipeline Creation Language (PCL).
#
# Pipeline Creation Language (PCL) is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Pipeline Creation Language (PCL) 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 Pipeline Creation Language (PCL). If not, see <http://www.gnu.org/licenses/>.
#
from multimethod import multimethod, multimethodclass
from parser.import_spec import Import
from parser.component import Component
from parser.conditional_expressions import AndConditionalExpression, \
OrConditionalExpression, \
XorConditionalExpression, \
EqualsConditionalExpression, \
NotEqualsConditionalExpression, \
GreaterThanConditionalExpression, \
LessThanConditionalExpression, \
GreaterThanEqualToConditionalExpression, \
LessThanEqualToConditionalExpression, \
UnaryConditionalExpression, \
TerminalConditionalExpression
from parser.declaration import Declaration
from parser.expressions import CompositionExpression, \
ParallelWithScalarExpression, \
IfExpression, \
Identifier, \
StateIdentifier
from pypeline.core.types.just import Just
from pypeline.core.types.nothing import Nothing
from first_pass_resolver_visitor import type_formatting_fn
from second_pass_resolver_visitor import SecondPassResolverVisitor
@multimethodclass
class ThirdPassResolverVisitor(SecondPassResolverVisitor):
def __init__(self):
SecondPassResolverVisitor.__init__(self)
@multimethod(object)
def visit(self, nowt):
# Root expression, so get inputs and outpus
# from module defined inputs and outputs clauses
expr = self._module.definition.definition
# Place the input/output specifications in a Maybe monad
expected_fn = lambda e: Just((frozenset(e[0]), frozenset(e[1]))) \
if isinstance(e, tuple) else Just(frozenset(e))
self._module.resolution_symbols['inputs'] = expected_fn(self._module.definition.inputs) >= \
(lambda expected_inputs: expr.resolution_symbols['inputs'] >= \
(lambda actual_inputs: self._add_errors("ERROR: %(filename)s at line %(lineno)d, component " \
"defines mismatched inputs:" \
"\n\texpected %(expected)s\n\tgot %(got)s", \
[expr],
lambda e: {'filename' : e.filename, \
'lineno' : e.lineno, \
'expected' : type_formatting_fn(expected_inputs), \
'got' : type_formatting_fn(actual_inputs)}) or Nothing() \
if expected_inputs != actual_inputs else Just(actual_inputs)))
self._module.resolution_symbols['outputs'] = expected_fn(self._module.definition.outputs) >= \
(lambda expected_outputs: expr.resolution_symbols['outputs'] >= \
(lambda actual_outputs: self._add_errors("ERROR: %(filename)s at line %(lineno)d, component " \
"defines mismatched outputs:" \
"\n\texpected %(expected)s\n\tgot %(got)s", \
[expr],
lambda e: {'filename' : e.filename, \
'lineno' : e.lineno, \
'expected' : type_formatting_fn(expected_outputs), \
'got' : type_formatting_fn(actual_outputs)}) or Nothing() \
if expected_outputs != actual_outputs else Just(actual_outputs)))
# (>>>) :: Arrow c => a b c -> a c d -> a b d
@multimethod(CompositionExpression)
def visit(self, comp_expr):
# Check that the composing components are output/input
# compatible
left_outputs = comp_expr.left.resolution_symbols['outputs']
right_inputs = comp_expr.right.resolution_symbols['inputs']
if left_outputs != right_inputs or left_outputs is Nothing() or right_inputs is Nothing():
self._add_errors("ERROR: %(filename)s at line %(lineno)d, attempted composition " \
"with incompatible components:\n\texpected %(expected)s\n\tgot %(got)s", \
[comp_expr],
lambda e: {'filename' : e.filename,
'lineno' : e.lineno,
'expected' : left_outputs >= type_formatting_fn,
'got' : right_inputs >= type_formatting_fn})
# Update the inputs and outputs for this composed component
comp_expr.resolution_symbols['inputs'] = comp_expr.left.resolution_symbols['inputs']
comp_expr.resolution_symbols['outputs'] = comp_expr.right.resolution_symbols['outputs']
# &&& : Arrow a => a b c -> a b c' -> a b (c c')
@multimethod(ParallelWithScalarExpression)
def visit(self, para_scalar_expr):
# Inputs are all the union of the top and bottom component inputs
top_inputs = para_scalar_expr.left.resolution_symbols['inputs']
bottom_inputs = para_scalar_expr.right.resolution_symbols['inputs']
if top_inputs != bottom_inputs or top_inputs is Nothing() or bottom_inputs is Nothing():
self._add_errors("ERROR: %(filename)s at line %(lineno)d, attempted use of incompatible inputs " \
"with components in fanout:\n\ttop %(top_inputs)s\n\tbottom %(bottom_inputs)s", \
[para_scalar_expr],
lambda e: {'filename' : e.filename,
'lineno' : e.lineno,
'top_inputs' : top_inputs >= type_formatting_fn,
'bottom_inputs' : bottom_inputs >= type_formatting_fn})
@multimethod(IfExpression)
def visit(self, if_expr):
# Store the current if expression for condition expression resolution
self._current_if_expr = if_expr
# Check that the then and else components' inputs and output match
then_inputs = if_expr.then.resolution_symbols['inputs']
then_outputs = if_expr.then.resolution_symbols['outputs']
else_inputs = if_expr.else_.resolution_symbols['inputs']
else_outputs = if_expr.else_.resolution_symbols['outputs']
if then_inputs != else_inputs or then_inputs is Nothing() or else_inputs is Nothing():
self._add_errors("ERROR: %(filename)s at line %(lineno)d, if components have mismatched " \
"component inputs:\n\tthen = %(then_inputs)s\n\telse = %(else_inputs)s",
[if_expr],
lambda i: {'filename' : i.filename,
'lineno' : i.lineno,
'then_inputs' : then_inputs >= type_formatting_fn,
'else_inputs' : else_inputs >= type_formatting_fn})
if then_outputs != else_outputs or then_outputs is Nothing() or else_outputs is Nothing():
self._add_errors("ERROR: %(filename)s at line %(lineno)d, if components have mismatched " \
"component outputs:\n\tthen = %(then_outputs)s\n\telse = %(else_outputs)s",
[if_expr],
lambda i: {'filename' : i.filename,
'lineno' : i.lineno,
'then_outputs' : then_outputs >= type_formatting_fn,
'else_outputs' : else_outputs >= type_formatting_fn})
if_expr.resolution_symbols['inputs'] = then_inputs
if_expr.resolution_symbols['outputs'] = then_outputs
@multimethod(TerminalConditionalExpression)
def visit(self, term_cond_expr):
terminal = term_cond_expr.terminal
if isinstance(terminal, StateIdentifier):
if terminal not in self._module.resolution_symbols['configuration']:
self._add_errors("ERROR: %(filename)s at line %(lineno)d, identifier %(entity)s " \
"not defined in component configuration",
[terminal],
lambda e: {'entity' : e,
'filename' : e.filename,
'lineno' : e.lineno})
elif isinstance(terminal, Identifier):
self._current_if_expr.resolution_symbols['inputs'] >= (lambda s: self._add_errors("ERROR: %(filename)s at line %(lineno)d, " \
"identifier %(entity)s not defined in " \
"if inputs",
[terminal],
lambda e: {'entity' : e,
'filename' : e.filename,
'lineno' : e.lineno}) \
if terminal not in s else None)
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