added basic search lexer and parser enabling search for parameters and attributes - could be extended

the error handling is very basic, but effective
some missing features like ordering
...and maybe a potential security as the search will allow search for all attributes somehow related to the component model

shimatta_kenkyusho/parts/views/component_views.py

@@ -1,4 +1,3 @@
-import uuid
 from django.shortcuts import redirect
 from django.urls import reverse
 from django.views.generic import TemplateView, DetailView
@@ -8,6 +7,7 @@ from django.db.models import Q
 from django.forms import formset_factory
 from django.db import IntegrityError
 from django.db.models import ProtectedError
+from shimatta_modules.ShimattaSearchLanguage import ShimattaSearchLanguage
 from ..models import Stock, Component, ComponentParameter, DistributorNum, PackageParameter
 from ..forms import *
 from .component_import import import_components_from_csv
@@ -26,15 +26,23 @@ class ComponentView(LoginRequiredMixin, BaseTemplateMixin, TemplateView):
 
     def get_component_query_set(self, search_string):
         queryset = Component.objects.all()
+        error_string = ''
 
         if not search_string:
             return queryset
+        
+        search_parser = ShimattaSearchLanguage()
+        query, errors = search_parser.search_for_components(search_string)
 
-        search_fragments = search_string.strip().split()
-        for search in search_fragments:
-            queryset = queryset.filter(Q(name__icontains = search) | Q(manufacturer__name__icontains = search) | Q(package__name__icontains = search))
+        if query:
+            try:
+                queryset = queryset.filter(query)
+            except Exception as ex:
+                error_string = str(ex)
+        else:
+            error_string = '<br><br>'.join(errors)
 
-        return queryset
+        return queryset, error_string
 
     def get_component_queryset_from_advanced_search(self, cleaned_data):
         queryset = Component.objects.all()
@@ -60,6 +68,8 @@ class ComponentView(LoginRequiredMixin, BaseTemplateMixin, TemplateView):
     def get_context_data_int(self, advanced_search, parameter_formset : ParameterSearchFormSet, **kwargs):
         context = super().get_context_data(**kwargs)
 
+        errors = ''
+
         comp_page_num = self.request.GET.get('comp_page', default=1)
 
         if advanced_search and parameter_formset:
@@ -79,7 +89,7 @@ class ComponentView(LoginRequiredMixin, BaseTemplateMixin, TemplateView):
 
         else:
             search = self.request.GET.get('search', default=None)
-            paginator_queryset = self.get_component_query_set(search)
+            paginator_queryset, errors = self.get_component_query_set(search)
 
         comp_paginator = Paginator(paginator_queryset, self.default_page_size)
 
@@ -87,11 +97,11 @@ class ComponentView(LoginRequiredMixin, BaseTemplateMixin, TemplateView):
         context['comp_form'] = ComponentForm()
         context['import_comp_form'] = ImportComponentForm()
         context['search_string'] = search
+        context['errors'] = errors
 
         if not parameter_formset:
             context['advanced_search_param_formset'] = ParameterSearchFormSet()
 
-
         if not advanced_search:
             context['advanced_search_form'] = AdvancedComponentSearchForm(auto_id='adv_search_%s')