# HG changeset patch
# User Andrey Skvortsov <andrej.skvortzov@gmail.com>
# Date 1551773976 -10800
# Node ID 27955f010b2316d449eb75ccf01fd27240f39c0a
# Parent  c48470e2b3833c6333e7653e1b90419b0875b9c3
Fix crash if LD input contact isn't connected

Traceback (most recent call last):
  File "/home/developer/WorkData/PLC/beremiz/beremiz/BeremizIDE.py", line 339, in OnMethod
    obj.CTR.CallMethod('_'+meth)
  File "/home/developer/WorkData/PLC/beremiz/beremiz/ProjectController.py", line 1996, in CallMethod
    getattr(self, method)()
  File "/home/developer/WorkData/PLC/beremiz/beremiz/ProjectController.py", line 1134, in _Build
    IECGenRes = self._Generate_SoftPLC()
  File "/home/developer/WorkData/PLC/beremiz/beremiz/ProjectController.py", line 746, in _Generate_SoftPLC
    if self._Generate_PLC_ST():
  File "/home/developer/WorkData/PLC/beremiz/beremiz/ProjectController.py", line 763, in _Generate_PLC_ST
    self._getIECgeneratedcodepath())
  File "/home/developer/WorkData/PLC/beremiz/beremiz/PLCControler.py", line 456, in GenerateProgram
    self.ProgramChunks = GenerateCurrentProgram(self, self.Project, errors, warnings)
  File "/home/developer/WorkData/PLC/beremiz/beremiz/PLCGenerator.py", line 1762, in GenerateCurrentProgram
    generator.GenerateProgram()
  File "/home/developer/WorkData/PLC/beremiz/beremiz/PLCGenerator.py", line 478, in GenerateProgram
    self.GeneratePouProgram(pou_name)
  File "/home/developer/WorkData/PLC/beremiz/beremiz/PLCGenerator.py", line 260, in GeneratePouProgram
    program = pou_program.GenerateProgram(pou)
  File "/home/developer/WorkData/PLC/beremiz/beremiz/PLCGenerator.py", line 1718, in GenerateProgram
    self.ComputeProgram(pou)
  File "/home/developer/WorkData/PLC/beremiz/beremiz/PLCGenerator.py", line 1028, in ComputeProgram
    self.GenerateBlock(instance, block_infos, body, None)
  File "/home/developer/WorkData/PLC/beremiz/beremiz/PLCGenerator.py", line 1144, in GenerateBlock
    expression = self.ComputeExpression(body, connections, executionOrderId > 0)
  File "/home/developer/WorkData/PLC/beremiz/beremiz/PLCGenerator.py", line 1373, in ComputeExpression
    paths = self.GeneratePaths(connections, body, order, to_inout)
  File "/home/developer/WorkData/PLC/beremiz/beremiz/PLCGenerator.py", line 1344, in GeneratePaths
    elif isinstance(result[0], list):
IndexError: list index out of range


Close #70

diff -r c48470e2b383 -r 27955f010b23 PLCGenerator.py
--- a/PLCGenerator.py	Fri Mar 01 16:55:16 2019 +0300
+++ b/PLCGenerator.py	Tue Mar 05 11:19:36 2019 +0300
@@ -1335,6 +1335,9 @@
                 contact_info = (self.TagName, "contact", next.getlocalId())
                 variable = str(self.ExtractModifier(next, [(next.getvariable(), contact_info + ("reference",))], contact_info))
                 result = self.GeneratePaths(next.connectionPointIn.getconnections(), body, order)
+                if len(result) == 0:
+                    raise PLCGenException(_("Contact \"{a1}\" in POU \"{a2}\" must be connected.").
+                                          format(a1=next.getvariable(), a2=self.Name))
                 if len(result) > 1:
                     factorized_paths = self.FactorizePaths(result)
                     if len(factorized_paths) > 1: