Re-land: Change actions.txt to actions.xml

tools/metrics/histograms/print_style.py

Index: tools/metrics/histograms/print_style.py
diff --git a/tools/metrics/histograms/print_style.py b/tools/metrics/histograms/print_style.py
new file mode 100644
index 0000000000000000000000000000000000000000..db90b1ec6a9003c2778bb6b48dc6df4c259643a4
--- /dev/null
+++ b/tools/metrics/histograms/print_style.py
@@ -0,0 +1,59 @@
+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""Holds the constants for pretty printing histograms.xml."""
+
+import os
+import sys
+
+# Import the metrics/common module for pretty print xml.
+sys.path.append(os.path.join(os.path.dirname(__file__), '..', 'common'))
+import pretty_print_xml
+
+# Desired order for tag attributes; attributes listed here will appear first,
+# and in the same order as in these lists.
+# { tag_name: [attribute_name, ...] }
+ATTRIBUTE_ORDER = {
+  'enum': ['name', 'type'],
+  'histogram': ['name', 'enum', 'units'],
+  'int': ['value', 'label'],
+  'fieldtrial': ['name', 'separator', 'ordering'],
+  'group': ['name', 'label'],
+  'affected-histogram': ['name'],
+  'with-group': ['name'],
+}
+
+# Tag names for top-level nodes whose children we don't want to indent.
+TAGS_THAT_DONT_INDENT = [
+  'histogram-configuration',
+  'histograms',
+  'fieldtrials',
+  'enums'
+]
+
+# Extra vertical spacing rules for special tag names.
+# {tag_name: (newlines_after_open, newlines_before_close, newlines_after_close)}
+TAGS_THAT_HAVE_EXTRA_NEWLINE = {
+  'histogram-configuration': (2, 1, 1),
+  'histograms': (2, 1, 1),
+  'fieldtrials': (2, 1, 1),
+  'enums': (2, 1, 1),
+  'histogram': (1, 1, 1),
+  'enum': (1, 1, 1),
+  'fieldtrial': (1, 1, 1),
+}
+
+# Tags that we allow to be squished into a single line for brevity.
+TAGS_THAT_ALLOW_SINGLE_LINE = [
+  'summary',
+  'int',
+]
+
+
+def GetPrintStyle():
+  """Returns an XmlStyle object for pretty printing histograms."""
+  return pretty_print_xml.XmlStyle(ATTRIBUTE_ORDER,
+                                   TAGS_THAT_HAVE_EXTRA_NEWLINE,
+                                   TAGS_THAT_DONT_INDENT,
+                                   TAGS_THAT_ALLOW_SINGLE_LINE)