framework/grid_view_helpers.py - monorail-avm99963 - Gitiles

 # Copyright 2016 The Chromium Authors
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

 """Classes and functions for displaying grids of project artifacts.

 A grid is a two-dimensional display of items where the user can choose
 the X and Y axes.
 """
 from __future__ import print_function
 from __future__ import division
 from __future__ import absolute_import

 import ezt

 import collections
 import logging
 import settings

 from features import features_constants
 from framework import framework_constants
 from framework import sorting
 from framework import table_view_helpers
 from framework import template_helpers
 from framework import urls
 from mrproto import tracker_pb2
 from tracker import tracker_bizobj
 from tracker import tracker_constants
 from tracker import tracker_helpers


 # We shorten long attribute values to fit into the table cells.
 _MAX_CELL_DISPLAY_CHARS = 70


 def SortGridHeadings(col_name, heading_value_list, users_by_id, config,
                      asc_accessors):
   """Sort the grid headings according to well-known status and label order.

   Args:
     col_name: String column name that is used on that grid axis.
     heading_value_list: List of grid row or column heading values.
     users_by_id: Dict mapping user_ids to UserViews.
     config: ProjectIssueConfig PB for the current project.
     asc_accessors: Dict (col_name -> function()) for special columns.

   Returns:
     The same heading values, but sorted in a logical order.
   """
   decorated_list = []
   fd = tracker_bizobj.FindFieldDef(col_name, config)
   if fd and fd.field_type != tracker_pb2.FieldTypes.ENUM_TYPE:  # Handle fields.
     for value in heading_value_list:
       field_value = tracker_bizobj.GetFieldValueWithRawValue(
           fd.field_type, None, users_by_id, value)
       decorated_list.append([field_value, field_value])
   elif col_name == 'status':
     wk_statuses = [wks.status.lower()
                    for wks in config.well_known_statuses]
     decorated_list = [(_WKSortingValue(value.lower(), wk_statuses), value)
                       for value in heading_value_list]

   elif col_name in asc_accessors:  # Special cols still sort alphabetically.
     decorated_list = [(value, value)
                       for value in heading_value_list]

   else:  # Anything else is assumed to be a label prefix
     col_name_dash = col_name + '-'
     wk_labels = []
     for wkl in config.well_known_labels:
       lab_lower = wkl.label.lower()
       if lab_lower.startswith(col_name_dash):
         wk_labels.append(lab_lower.split('-', 1)[-1])
     decorated_list = [(_WKSortingValue(value.lower(), wk_labels), value)
                       for value in heading_value_list]

   decorated_list.sort()
   result = [decorated_tuple[1] for decorated_tuple in decorated_list]
   logging.info('Headers for %s are: %r', col_name, result)
   return result


 def _WKSortingValue(value, well_known_list):
   """Return a value used to sort headings so that well-known ones are first."""
   if not value:
     return sorting.MAX_STRING  # Undefined values sort last.
   try:
     # well-known values sort by index
     return '%09d' % well_known_list.index(value)
   except ValueError:
     return value  # odd-ball values lexicographically after all well-known ones


 def MakeGridData(
     artifacts, x_attr, x_headings, y_attr, y_headings, users_by_id,
     artifact_view_factory, all_label_values, config, related_issues,
     hotlist_context_dict=None):
   """Return a list of grid row items for display by EZT.

   Args:
     artifacts: a list of issues to consider showing.
     x_attr: lowercase name of the attribute that defines the x-axis.
     x_headings: list of values for column headings.
     y_attr: lowercase name of the attribute that defines the y-axis.
     y_headings: list of values for row headings.
     users_by_id: dict {user_id: user_view, ...} for referenced users.
     artifact_view_factory: constructor for grid tiles.
     all_label_values: pre-parsed dictionary of values from the key-value
         labels on each issue: {issue_id: {key: [val,...], ...}, ...}
     config: ProjectIssueConfig PB for the current project.
     related_issues: dict {issue_id: issue} of pre-fetched related issues.
     hotlist_context_dict: dict{issue_id: {hotlist_item_field: field_value, ..}}

   Returns:
     A list of EZTItems, each representing one grid row, and each having
     a nested list of grid cells.

   Each grid row has a row name, and a list of cells.  Each cell has a
   list of tiles.  Each tile represents one artifact.  Artifacts are
   represented once in each cell that they match, so one artifact that
   has multiple values for a certain attribute can occur in multiple cells.
   """
   x_attr = x_attr.lower()
   y_attr = y_attr.lower()

   # A flat dictionary {(x, y): [cell, ...], ...] for the whole grid.
   x_y_data = collections.defaultdict(list)

   # Put each issue into the grid cell(s) where it belongs.
   for art in artifacts:
     if hotlist_context_dict:
       hotlist_issues_context = hotlist_context_dict[art.issue_id]
     else:
       hotlist_issues_context = None
     label_value_dict = all_label_values[art.local_id]
     x_vals = GetArtifactAttr(
         art, x_attr, users_by_id, label_value_dict, config, related_issues,
         hotlist_issue_context=hotlist_issues_context)
     y_vals = GetArtifactAttr(
         art, y_attr, users_by_id, label_value_dict, config, related_issues,
         hotlist_issue_context=hotlist_issues_context)
     tile = artifact_view_factory(art)

     # Put the current issue into each cell where it belongs, which will usually
     # be exactly 1 cell, but it could be a few.
     if x_attr != '--' and y_attr != '--':  # User specified both axes.
       for x in x_vals:
         for y in y_vals:
           x_y_data[x, y].append(tile)
     elif y_attr != '--':  # User only specified Y axis.
       for y in y_vals:
         x_y_data['All', y].append(tile)
     elif x_attr != '--':  # User only specified X axis.
       for x in x_vals:
         x_y_data[x, 'All'].append(tile)
     else:  # User specified neither axis.
       x_y_data['All', 'All'].append(tile)

   # Convert the dictionary to a list-of-lists so that EZT can iterate over it.
   grid_data = []
   i = 0
   for y in y_headings:
     cells_in_row = []
     for x in x_headings:
       tiles = x_y_data[x, y]
       for tile in tiles:
         tile.data_idx = i
         i += 1

       drill_down = ''
       if x_attr != '--':
         drill_down = MakeDrillDownSearch(x_attr, x)
       if y_attr != '--':
         drill_down += MakeDrillDownSearch(y_attr, y)

       cells_in_row.append(template_helpers.EZTItem(
           tiles=tiles, count=len(tiles), drill_down=drill_down))
     grid_data.append(template_helpers.EZTItem(
         grid_y_heading=y, cells_in_row=cells_in_row))

   return grid_data


 def MakeDrillDownSearch(attr, value):
   """Constructs search term for drill-down.

   Args:
     attr: lowercase name of the attribute to narrow the search on.
     value: value to narrow the search to.

   Returns:
     String with user-query term to narrow a search to the given attr value.
   """
   if value == framework_constants.NO_VALUES:
     return '-has:%s ' % attr
   else:
     return '%s=%s ' % (attr, value)


 def MakeLabelValuesDict(art):
   """Return a dict of label values and a list of one-word labels.

   Args:
     art: artifact object, e.g., an issue PB.

   Returns:
     A dict {prefix: [suffix,...], ...} for each key-value label.
   """
   label_values = collections.defaultdict(list)
   for label_name in tracker_bizobj.GetLabels(art):
     if '-' in label_name:
       key, value = label_name.split('-', 1)
       label_values[key.lower()].append(value)

   return label_values


 def GetArtifactAttr(
     art, attribute_name, users_by_id, label_attr_values_dict,
     config, related_issues, hotlist_issue_context=None):
   """Return the requested attribute values of the given artifact.

   Args:
     art: a tracked artifact with labels, local_id, summary, stars, and owner.
     attribute_name: lowercase string name of attribute to get.
     users_by_id: dictionary of UserViews already created.
     label_attr_values_dict: dictionary {'key': [value, ...], }.
     config: ProjectIssueConfig PB for the current project.
     related_issues: dict {issue_id: issue} of pre-fetched related issues.
     hotlist_issue_context: dict of {hotlist_issue_field: field_value,..}

   Returns:
     A list of string attribute values, or [framework_constants.NO_VALUES]
     if the artifact has no value for that attribute.
   """
   if attribute_name == '--':
     return []
   if attribute_name == 'id':
     return [art.local_id]
   if attribute_name == 'summary':
     return [art.summary]
   if attribute_name == 'status':
     return [tracker_bizobj.GetStatus(art)]
   if attribute_name == 'stars':
     return [art.star_count]
   if attribute_name == 'attachments':
     return [art.attachment_count]
   # TODO(jrobbins): support blocking
   if attribute_name == 'project':
     return [art.project_name]
   if attribute_name == 'mergedinto':
     if art.merged_into and art.merged_into != 0:
       return [tracker_bizobj.FormatIssueRef((
           related_issues[art.merged_into].project_name,
           related_issues[art.merged_into].local_id))]
     else:
       return [framework_constants.NO_VALUES]
   if attribute_name == 'blocked':
     return ['Yes' if art.blocked_on_iids else 'No']
   if attribute_name == 'blockedon':
     if not art.blocked_on_iids:
       return [framework_constants.NO_VALUES]
     else:
       return [tracker_bizobj.FormatIssueRef((
           related_issues[blocked_on_iid].project_name,
           related_issues[blocked_on_iid].local_id)) for
               blocked_on_iid in art.blocked_on_iids]
   if attribute_name == 'blocking':
     if not art.blocking_iids:
       return [framework_constants.NO_VALUES]
     return [tracker_bizobj.FormatIssueRef((
         related_issues[blocking_iid].project_name,
         related_issues[blocking_iid].local_id)) for
             blocking_iid in art.blocking_iids]
   if attribute_name == 'adder':
     if hotlist_issue_context:
       adder_id = hotlist_issue_context['adder_id']
       return [users_by_id[adder_id].display_name]
     else:
       return [framework_constants.NO_VALUES]
   if attribute_name == 'added':
     if hotlist_issue_context:
       return [hotlist_issue_context['date_added']]
     else:
       return [framework_constants.NO_VALUES]
   if attribute_name == 'reporter':
     return [users_by_id[art.reporter_id].display_name]
   if attribute_name == 'owner':
     owner_id = tracker_bizobj.GetOwnerId(art)
     if not owner_id:
       return [framework_constants.NO_VALUES]
     else:
       return [users_by_id[owner_id].display_name]
   if attribute_name == 'cc':
     cc_ids = tracker_bizobj.GetCcIds(art)
     if not cc_ids:
       return [framework_constants.NO_VALUES]
     else:
       return [users_by_id[cc_id].display_name for cc_id in cc_ids]
   if attribute_name == 'component':
     comp_ids = list(art.component_ids) + list(art.derived_component_ids)
     if not comp_ids:
       return [framework_constants.NO_VALUES]
     else:
       paths = []
       for comp_id in comp_ids:
         cd = tracker_bizobj.FindComponentDefByID(comp_id, config)
         if cd:
           paths.append(cd.path)
       return paths

   # Check to see if it is a field. Process as field only if it is not an enum
   # type because enum types are stored as key-value labels.
   fd = tracker_bizobj.FindFieldDef(attribute_name, config)
   if fd and fd.field_type != tracker_pb2.FieldTypes.ENUM_TYPE:
     values = []
     for fv in art.field_values:
       if fv.field_id == fd.field_id:
         value = tracker_bizobj.GetFieldValueWithRawValue(
             fd.field_type, fv, users_by_id, None)
         values.append(value)
     return values

   # Since it is not a built-in attribute or a field, it must be a key-value
   # label.
   return label_attr_values_dict.get(
       attribute_name, [framework_constants.NO_VALUES])


 def AnyArtifactHasNoAttr(
     artifacts, attr_name, users_by_id, all_label_values, config,
     related_issues, hotlist_context_dict=None):
   """Return true if any artifact does not have a value for attr_name."""
   # TODO(jrobbins): all_label_values needs to be keyed by issue_id to allow
   # cross-project grid views.
   for art in artifacts:
     if hotlist_context_dict:
       hotlist_issue_context = hotlist_context_dict[art.issue_id]
     else:
       hotlist_issue_context = None
     vals = GetArtifactAttr(
         art, attr_name.lower(), users_by_id, all_label_values[art.local_id],
         config, related_issues, hotlist_issue_context=hotlist_issue_context)
     if framework_constants.NO_VALUES in vals:
       return True

   return False


 def GetGridViewData(
     mr, results, config, users_by_id, starred_iid_set,
     grid_limited, related_issues, hotlist_context_dict=None):
   """EZT template values to render a Grid View of issues.
   Args:
     mr: commonly used info parsed from the request.
     results: The Issue PBs that are the search results to be displayed.
     config: The ProjectConfig PB for the project this view is in.
     users_by_id: A dictionary {user_id: user_view,...} for all the users
         involved in results.
     starred_iid_set: Set of issues that the user has starred.
     grid_limited: True if the results were limited to fit within the grid.
     related_issues: dict {issue_id: issue} of pre-fetched related issues.
     hotlist_context_dict: dict for building a hotlist grid table

   Returns:
     Dictionary for EZT template rendering of the Grid View.
   """
   # We need ordered_columns because EZT loops have no loop-counter available.
   # And, we use column number in the Javascript to hide/show columns.
   columns = mr.col_spec.split()
   ordered_columns = [template_helpers.EZTItem(col_index=i, name=col)
                      for i, col in enumerate(columns)]
   other_built_in_cols = (features_constants.OTHER_BUILT_IN_COLS if
                          hotlist_context_dict else
                          tracker_constants.OTHER_BUILT_IN_COLS)
   unshown_columns = table_view_helpers.ComputeUnshownColumns(
       results, columns, config, other_built_in_cols)

   grid_x_attr = (mr.x or config.default_x_attr or '--').lower()
   grid_y_attr = (mr.y or config.default_y_attr or '--').lower()

   # Prevent the user from using an axis that we don't support.
   for bad_axis in tracker_constants.NOT_USED_IN_GRID_AXES:
     lower_bad_axis = bad_axis.lower()
     if grid_x_attr == lower_bad_axis:
       grid_x_attr = '--'
     if grid_y_attr == lower_bad_axis:
       grid_y_attr = '--'
   # Using the same attribute on both X and Y is not useful.
   if grid_x_attr == grid_y_attr:
     grid_x_attr = '--'

   all_label_values = {}
   for art in results:
     all_label_values[art.local_id] = (
         MakeLabelValuesDict(art))

   if grid_x_attr == '--':
     grid_x_headings = ['All']
   else:
     grid_x_items = table_view_helpers.ExtractUniqueValues(
         [grid_x_attr], results, users_by_id, config, related_issues,
         hotlist_context_dict=hotlist_context_dict)
     grid_x_headings = grid_x_items[0].filter_values
     if AnyArtifactHasNoAttr(
         results, grid_x_attr, users_by_id, all_label_values,
         config, related_issues, hotlist_context_dict= hotlist_context_dict):
       grid_x_headings.append(framework_constants.NO_VALUES)
     grid_x_headings = SortGridHeadings(
         grid_x_attr, grid_x_headings, users_by_id, config,
         tracker_helpers.SORTABLE_FIELDS)

   if grid_y_attr == '--':
     grid_y_headings = ['All']
   else:
     grid_y_items = table_view_helpers.ExtractUniqueValues(
         [grid_y_attr], results, users_by_id, config, related_issues,
         hotlist_context_dict=hotlist_context_dict)
     grid_y_headings = grid_y_items[0].filter_values
     if AnyArtifactHasNoAttr(
         results, grid_y_attr, users_by_id, all_label_values,
         config, related_issues, hotlist_context_dict= hotlist_context_dict):
       grid_y_headings.append(framework_constants.NO_VALUES)
     grid_y_headings = SortGridHeadings(
         grid_y_attr, grid_y_headings, users_by_id, config,
         tracker_helpers.SORTABLE_FIELDS)

   logging.info('grid_x_headings = %s', grid_x_headings)
   logging.info('grid_y_headings = %s', grid_y_headings)
   grid_data = PrepareForMakeGridData(
       results, starred_iid_set, grid_x_attr, grid_x_headings,
       grid_y_attr, grid_y_headings, users_by_id, all_label_values,
       config, related_issues, hotlist_context_dict=hotlist_context_dict)

   grid_axis_choice_dict = {}
   for oc in ordered_columns:
     grid_axis_choice_dict[oc.name] = True
   for uc in unshown_columns:
     grid_axis_choice_dict[uc] = True
   for bad_axis in tracker_constants.NOT_USED_IN_GRID_AXES:
     if bad_axis in grid_axis_choice_dict:
       del grid_axis_choice_dict[bad_axis]
   grid_axis_choices = list(grid_axis_choice_dict.keys())
   grid_axis_choices.sort()

   grid_cell_mode = mr.cells
   if len(results) > settings.max_tiles_in_grid and mr.cells == 'tiles':
     grid_cell_mode = 'ids'

   grid_view_data = {
       'grid_limited': ezt.boolean(grid_limited),
       'grid_shown': len(results),
       'grid_x_headings': grid_x_headings,
       'grid_y_headings': grid_y_headings,
       'grid_data': grid_data,
       'grid_axis_choices': grid_axis_choices,
       'grid_cell_mode': grid_cell_mode,
       'results': results,  # Really only useful in if-any.
   }
   return grid_view_data


 def PrepareForMakeGridData(
     allowed_results, starred_iid_set, x_attr,
     grid_col_values, y_attr, grid_row_values, users_by_id, all_label_values,
     config, related_issues, hotlist_context_dict=None):
   """Return all data needed for EZT to render the body of the grid view."""

   def IssueViewFactory(issue):
     return template_helpers.EZTItem(
       summary=issue.summary, local_id=issue.local_id, issue_id=issue.issue_id,
       status=issue.status or issue.derived_status, starred=None, data_idx=0,
       project_name=issue.project_name)

   grid_data = MakeGridData(
       allowed_results, x_attr, grid_col_values, y_attr, grid_row_values,
       users_by_id, IssueViewFactory, all_label_values, config, related_issues,
       hotlist_context_dict=hotlist_context_dict)
   issue_dict = {issue.issue_id: issue for issue in allowed_results}
   for grid_row in grid_data:
     for grid_cell in grid_row.cells_in_row:
       for tile in grid_cell.tiles:
         if tile.issue_id in starred_iid_set:
           tile.starred = ezt.boolean(True)
         issue = issue_dict[tile.issue_id]
         tile.issue_url = tracker_helpers.FormatRelativeIssueURL(
             issue.project_name, urls.ISSUE_DETAIL, id=tile.local_id)
         tile.issue_ref = issue.project_name + ':' + str(tile.local_id)

   return grid_data
	# Copyright 2016 The Chromium Authors
	# Use of this source code is governed by a BSD-style license that can be
	# found in the LICENSE file.

	"""Classes and functions for displaying grids of project artifacts.

	A grid is a two-dimensional display of items where the user can choose
	the X and Y axes.
	"""
	from __future__ import print_function
	from __future__ import division
	from __future__ import absolute_import

	import ezt

	import collections
	import logging
	import settings

	from features import features_constants
	from framework import framework_constants
	from framework import sorting
	from framework import table_view_helpers
	from framework import template_helpers
	from framework import urls
	from mrproto import tracker_pb2
	from tracker import tracker_bizobj
	from tracker import tracker_constants
	from tracker import tracker_helpers


	# We shorten long attribute values to fit into the table cells.
	_MAX_CELL_DISPLAY_CHARS = 70


	def SortGridHeadings(col_name, heading_value_list, users_by_id, config,
	asc_accessors):
	"""Sort the grid headings according to well-known status and label order.

	Args:
	col_name: String column name that is used on that grid axis.
	heading_value_list: List of grid row or column heading values.
	users_by_id: Dict mapping user_ids to UserViews.
	config: ProjectIssueConfig PB for the current project.
	asc_accessors: Dict (col_name -> function()) for special columns.

	Returns:
	The same heading values, but sorted in a logical order.
	"""
	decorated_list = []
	fd = tracker_bizobj.FindFieldDef(col_name, config)
	if fd and fd.field_type != tracker_pb2.FieldTypes.ENUM_TYPE: # Handle fields.
	for value in heading_value_list:
	field_value = tracker_bizobj.GetFieldValueWithRawValue(
	fd.field_type, None, users_by_id, value)
	decorated_list.append([field_value, field_value])
	elif col_name == 'status':
	wk_statuses = [wks.status.lower()
	for wks in config.well_known_statuses]
	decorated_list = [(_WKSortingValue(value.lower(), wk_statuses), value)
	for value in heading_value_list]

	elif col_name in asc_accessors: # Special cols still sort alphabetically.
	decorated_list = [(value, value)
	for value in heading_value_list]

	else: # Anything else is assumed to be a label prefix
	col_name_dash = col_name + '-'
	wk_labels = []
	for wkl in config.well_known_labels:
	lab_lower = wkl.label.lower()
	if lab_lower.startswith(col_name_dash):
	wk_labels.append(lab_lower.split('-', 1)[-1])
	decorated_list = [(_WKSortingValue(value.lower(), wk_labels), value)
	for value in heading_value_list]

	decorated_list.sort()
	result = [decorated_tuple[1] for decorated_tuple in decorated_list]
	logging.info('Headers for %s are: %r', col_name, result)
	return result


	def _WKSortingValue(value, well_known_list):
	"""Return a value used to sort headings so that well-known ones are first."""
	if not value:
	return sorting.MAX_STRING # Undefined values sort last.
	try:
	# well-known values sort by index
	return '%09d' % well_known_list.index(value)
	except ValueError:
	return value # odd-ball values lexicographically after all well-known ones


	def MakeGridData(
	artifacts, x_attr, x_headings, y_attr, y_headings, users_by_id,
	artifact_view_factory, all_label_values, config, related_issues,
	hotlist_context_dict=None):
	"""Return a list of grid row items for display by EZT.

	Args:
	artifacts: a list of issues to consider showing.
	x_attr: lowercase name of the attribute that defines the x-axis.
	x_headings: list of values for column headings.
	y_attr: lowercase name of the attribute that defines the y-axis.
	y_headings: list of values for row headings.
	users_by_id: dict {user_id: user_view, ...} for referenced users.
	artifact_view_factory: constructor for grid tiles.
	all_label_values: pre-parsed dictionary of values from the key-value
	labels on each issue: {issue_id: {key: [val,...], ...}, ...}
	config: ProjectIssueConfig PB for the current project.
	related_issues: dict {issue_id: issue} of pre-fetched related issues.
	hotlist_context_dict: dict{issue_id: {hotlist_item_field: field_value, ..}}

	Returns:
	A list of EZTItems, each representing one grid row, and each having
	a nested list of grid cells.

	Each grid row has a row name, and a list of cells. Each cell has a
	list of tiles. Each tile represents one artifact. Artifacts are
	represented once in each cell that they match, so one artifact that
	has multiple values for a certain attribute can occur in multiple cells.
	"""
	x_attr = x_attr.lower()
	y_attr = y_attr.lower()

	# A flat dictionary {(x, y): [cell, ...], ...] for the whole grid.
	x_y_data = collections.defaultdict(list)

	# Put each issue into the grid cell(s) where it belongs.
	for art in artifacts:
	if hotlist_context_dict:
	hotlist_issues_context = hotlist_context_dict[art.issue_id]
	else:
	hotlist_issues_context = None
	label_value_dict = all_label_values[art.local_id]
	x_vals = GetArtifactAttr(
	art, x_attr, users_by_id, label_value_dict, config, related_issues,
	hotlist_issue_context=hotlist_issues_context)
	y_vals = GetArtifactAttr(
	art, y_attr, users_by_id, label_value_dict, config, related_issues,
	hotlist_issue_context=hotlist_issues_context)
	tile = artifact_view_factory(art)

	# Put the current issue into each cell where it belongs, which will usually
	# be exactly 1 cell, but it could be a few.
	if x_attr != '--' and y_attr != '--': # User specified both axes.
	for x in x_vals:
	for y in y_vals:
	x_y_data[x, y].append(tile)
	elif y_attr != '--': # User only specified Y axis.
	for y in y_vals:
	x_y_data['All', y].append(tile)
	elif x_attr != '--': # User only specified X axis.
	for x in x_vals:
	x_y_data[x, 'All'].append(tile)
	else: # User specified neither axis.
	x_y_data['All', 'All'].append(tile)

	# Convert the dictionary to a list-of-lists so that EZT can iterate over it.
	grid_data = []
	i = 0
	for y in y_headings:
	cells_in_row = []
	for x in x_headings:
	tiles = x_y_data[x, y]
	for tile in tiles:
	tile.data_idx = i
	i += 1

	drill_down = ''
	if x_attr != '--':
	drill_down = MakeDrillDownSearch(x_attr, x)
	if y_attr != '--':
	drill_down += MakeDrillDownSearch(y_attr, y)

	cells_in_row.append(template_helpers.EZTItem(
	tiles=tiles, count=len(tiles), drill_down=drill_down))
	grid_data.append(template_helpers.EZTItem(
	grid_y_heading=y, cells_in_row=cells_in_row))

	return grid_data


	def MakeDrillDownSearch(attr, value):
	"""Constructs search term for drill-down.

	Args:
	attr: lowercase name of the attribute to narrow the search on.
	value: value to narrow the search to.

	Returns:
	String with user-query term to narrow a search to the given attr value.
	"""
	if value == framework_constants.NO_VALUES:
	return '-has:%s ' % attr
	else:
	return '%s=%s ' % (attr, value)


	def MakeLabelValuesDict(art):
	"""Return a dict of label values and a list of one-word labels.

	Args:
	art: artifact object, e.g., an issue PB.

	Returns:
	A dict {prefix: [suffix,...], ...} for each key-value label.
	"""
	label_values = collections.defaultdict(list)
	for label_name in tracker_bizobj.GetLabels(art):
	if '-' in label_name:
	key, value = label_name.split('-', 1)
	label_values[key.lower()].append(value)

	return label_values


	def GetArtifactAttr(
	art, attribute_name, users_by_id, label_attr_values_dict,
	config, related_issues, hotlist_issue_context=None):
	"""Return the requested attribute values of the given artifact.

	Args:
	art: a tracked artifact with labels, local_id, summary, stars, and owner.
	attribute_name: lowercase string name of attribute to get.
	users_by_id: dictionary of UserViews already created.
	label_attr_values_dict: dictionary {'key': [value, ...], }.
	config: ProjectIssueConfig PB for the current project.
	related_issues: dict {issue_id: issue} of pre-fetched related issues.
	hotlist_issue_context: dict of {hotlist_issue_field: field_value,..}

	Returns:
	A list of string attribute values, or [framework_constants.NO_VALUES]
	if the artifact has no value for that attribute.
	"""
	if attribute_name == '--':
	return []
	if attribute_name == 'id':
	return [art.local_id]
	if attribute_name == 'summary':
	return [art.summary]
	if attribute_name == 'status':
	return [tracker_bizobj.GetStatus(art)]
	if attribute_name == 'stars':
	return [art.star_count]
	if attribute_name == 'attachments':
	return [art.attachment_count]
	# TODO(jrobbins): support blocking
	if attribute_name == 'project':
	return [art.project_name]
	if attribute_name == 'mergedinto':
	if art.merged_into and art.merged_into != 0:
	return [tracker_bizobj.FormatIssueRef((
	related_issues[art.merged_into].project_name,
	related_issues[art.merged_into].local_id))]
	else:
	return [framework_constants.NO_VALUES]
	if attribute_name == 'blocked':
	return ['Yes' if art.blocked_on_iids else 'No']
	if attribute_name == 'blockedon':
	if not art.blocked_on_iids:
	return [framework_constants.NO_VALUES]
	else:
	return [tracker_bizobj.FormatIssueRef((
	related_issues[blocked_on_iid].project_name,
	related_issues[blocked_on_iid].local_id)) for
	blocked_on_iid in art.blocked_on_iids]
	if attribute_name == 'blocking':
	if not art.blocking_iids:
	return [framework_constants.NO_VALUES]
	return [tracker_bizobj.FormatIssueRef((
	related_issues[blocking_iid].project_name,
	related_issues[blocking_iid].local_id)) for
	blocking_iid in art.blocking_iids]
	if attribute_name == 'adder':
	if hotlist_issue_context:
	adder_id = hotlist_issue_context['adder_id']
	return [users_by_id[adder_id].display_name]
	else:
	return [framework_constants.NO_VALUES]
	if attribute_name == 'added':
	if hotlist_issue_context:
	return [hotlist_issue_context['date_added']]
	else:
	return [framework_constants.NO_VALUES]
	if attribute_name == 'reporter':
	return [users_by_id[art.reporter_id].display_name]
	if attribute_name == 'owner':
	owner_id = tracker_bizobj.GetOwnerId(art)
	if not owner_id:
	return [framework_constants.NO_VALUES]
	else:
	return [users_by_id[owner_id].display_name]
	if attribute_name == 'cc':
	cc_ids = tracker_bizobj.GetCcIds(art)
	if not cc_ids:
	return [framework_constants.NO_VALUES]
	else:
	return [users_by_id[cc_id].display_name for cc_id in cc_ids]
	if attribute_name == 'component':
	comp_ids = list(art.component_ids) + list(art.derived_component_ids)
	if not comp_ids:
	return [framework_constants.NO_VALUES]
	else:
	paths = []
	for comp_id in comp_ids:
	cd = tracker_bizobj.FindComponentDefByID(comp_id, config)
	if cd:
	paths.append(cd.path)
	return paths

	# Check to see if it is a field. Process as field only if it is not an enum
	# type because enum types are stored as key-value labels.
	fd = tracker_bizobj.FindFieldDef(attribute_name, config)
	if fd and fd.field_type != tracker_pb2.FieldTypes.ENUM_TYPE:
	values = []
	for fv in art.field_values:
	if fv.field_id == fd.field_id:
	value = tracker_bizobj.GetFieldValueWithRawValue(
	fd.field_type, fv, users_by_id, None)
	values.append(value)
	return values

	# Since it is not a built-in attribute or a field, it must be a key-value
	# label.
	return label_attr_values_dict.get(
	attribute_name, [framework_constants.NO_VALUES])


	def AnyArtifactHasNoAttr(
	artifacts, attr_name, users_by_id, all_label_values, config,
	related_issues, hotlist_context_dict=None):
	"""Return true if any artifact does not have a value for attr_name."""
	# TODO(jrobbins): all_label_values needs to be keyed by issue_id to allow
	# cross-project grid views.
	for art in artifacts:
	if hotlist_context_dict:
	hotlist_issue_context = hotlist_context_dict[art.issue_id]
	else:
	hotlist_issue_context = None
	vals = GetArtifactAttr(
	art, attr_name.lower(), users_by_id, all_label_values[art.local_id],
	config, related_issues, hotlist_issue_context=hotlist_issue_context)
	if framework_constants.NO_VALUES in vals:
	return True

	return False


	def GetGridViewData(
	mr, results, config, users_by_id, starred_iid_set,
	grid_limited, related_issues, hotlist_context_dict=None):
	"""EZT template values to render a Grid View of issues.
	Args:
	mr: commonly used info parsed from the request.
	results: The Issue PBs that are the search results to be displayed.
	config: The ProjectConfig PB for the project this view is in.
	users_by_id: A dictionary {user_id: user_view,...} for all the users
	involved in results.
	starred_iid_set: Set of issues that the user has starred.
	grid_limited: True if the results were limited to fit within the grid.
	related_issues: dict {issue_id: issue} of pre-fetched related issues.
	hotlist_context_dict: dict for building a hotlist grid table

	Returns:
	Dictionary for EZT template rendering of the Grid View.
	"""
	# We need ordered_columns because EZT loops have no loop-counter available.
	# And, we use column number in the Javascript to hide/show columns.
	columns = mr.col_spec.split()
	ordered_columns = [template_helpers.EZTItem(col_index=i, name=col)
	for i, col in enumerate(columns)]
	other_built_in_cols = (features_constants.OTHER_BUILT_IN_COLS if
	hotlist_context_dict else
	tracker_constants.OTHER_BUILT_IN_COLS)
	unshown_columns = table_view_helpers.ComputeUnshownColumns(
	results, columns, config, other_built_in_cols)

	grid_x_attr = (mr.x or config.default_x_attr or '--').lower()
	grid_y_attr = (mr.y or config.default_y_attr or '--').lower()

	# Prevent the user from using an axis that we don't support.
	for bad_axis in tracker_constants.NOT_USED_IN_GRID_AXES:
	lower_bad_axis = bad_axis.lower()
	if grid_x_attr == lower_bad_axis:
	grid_x_attr = '--'
	if grid_y_attr == lower_bad_axis:
	grid_y_attr = '--'
	# Using the same attribute on both X and Y is not useful.
	if grid_x_attr == grid_y_attr:
	grid_x_attr = '--'

	all_label_values = {}
	for art in results:
	all_label_values[art.local_id] = (
	MakeLabelValuesDict(art))

	if grid_x_attr == '--':
	grid_x_headings = ['All']
	else:
	grid_x_items = table_view_helpers.ExtractUniqueValues(
	[grid_x_attr], results, users_by_id, config, related_issues,
	hotlist_context_dict=hotlist_context_dict)
	grid_x_headings = grid_x_items[0].filter_values
	if AnyArtifactHasNoAttr(
	results, grid_x_attr, users_by_id, all_label_values,
	config, related_issues, hotlist_context_dict= hotlist_context_dict):
	grid_x_headings.append(framework_constants.NO_VALUES)
	grid_x_headings = SortGridHeadings(
	grid_x_attr, grid_x_headings, users_by_id, config,
	tracker_helpers.SORTABLE_FIELDS)

	if grid_y_attr == '--':
	grid_y_headings = ['All']
	else:
	grid_y_items = table_view_helpers.ExtractUniqueValues(
	[grid_y_attr], results, users_by_id, config, related_issues,
	hotlist_context_dict=hotlist_context_dict)
	grid_y_headings = grid_y_items[0].filter_values
	if AnyArtifactHasNoAttr(
	results, grid_y_attr, users_by_id, all_label_values,
	config, related_issues, hotlist_context_dict= hotlist_context_dict):
	grid_y_headings.append(framework_constants.NO_VALUES)
	grid_y_headings = SortGridHeadings(
	grid_y_attr, grid_y_headings, users_by_id, config,
	tracker_helpers.SORTABLE_FIELDS)

	logging.info('grid_x_headings = %s', grid_x_headings)
	logging.info('grid_y_headings = %s', grid_y_headings)
	grid_data = PrepareForMakeGridData(
	results, starred_iid_set, grid_x_attr, grid_x_headings,
	grid_y_attr, grid_y_headings, users_by_id, all_label_values,
	config, related_issues, hotlist_context_dict=hotlist_context_dict)

	grid_axis_choice_dict = {}
	for oc in ordered_columns:
	grid_axis_choice_dict[oc.name] = True
	for uc in unshown_columns:
	grid_axis_choice_dict[uc] = True
	for bad_axis in tracker_constants.NOT_USED_IN_GRID_AXES:
	if bad_axis in grid_axis_choice_dict:
	del grid_axis_choice_dict[bad_axis]
	grid_axis_choices = list(grid_axis_choice_dict.keys())
	grid_axis_choices.sort()

	grid_cell_mode = mr.cells
	if len(results) > settings.max_tiles_in_grid and mr.cells == 'tiles':
	grid_cell_mode = 'ids'

	grid_view_data = {
	'grid_limited': ezt.boolean(grid_limited),
	'grid_shown': len(results),
	'grid_x_headings': grid_x_headings,
	'grid_y_headings': grid_y_headings,
	'grid_data': grid_data,
	'grid_axis_choices': grid_axis_choices,
	'grid_cell_mode': grid_cell_mode,
	'results': results, # Really only useful in if-any.
	}
	return grid_view_data


	def PrepareForMakeGridData(
	allowed_results, starred_iid_set, x_attr,
	grid_col_values, y_attr, grid_row_values, users_by_id, all_label_values,
	config, related_issues, hotlist_context_dict=None):
	"""Return all data needed for EZT to render the body of the grid view."""

	def IssueViewFactory(issue):
	return template_helpers.EZTItem(
	summary=issue.summary, local_id=issue.local_id, issue_id=issue.issue_id,
	status=issue.status or issue.derived_status, starred=None, data_idx=0,
	project_name=issue.project_name)

	grid_data = MakeGridData(
	allowed_results, x_attr, grid_col_values, y_attr, grid_row_values,
	users_by_id, IssueViewFactory, all_label_values, config, related_issues,
	hotlist_context_dict=hotlist_context_dict)
	issue_dict = {issue.issue_id: issue for issue in allowed_results}
	for grid_row in grid_data:
	for grid_cell in grid_row.cells_in_row:
	for tile in grid_cell.tiles:
	if tile.issue_id in starred_iid_set:
	tile.starred = ezt.boolean(True)
	issue = issue_dict[tile.issue_id]
	tile.issue_url = tracker_helpers.FormatRelativeIssueURL(
	issue.project_name, urls.ISSUE_DETAIL, id=tile.local_id)
	tile.issue_ref = issue.project_name + ':' + str(tile.local_id)

	return grid_data