C-Dash: Add regexp filtering to comparison tables

Signed-off-by: Tibor Frank <tifrank@cisco.com>
Change-Id: Ibe2b951859c9d775dd386dadd1bb141d74f53652

1 files changed, 62 insertions, 0 deletions

diff --git a/csit.infra.dash/app/cdash/comparisons/tables.py b/csit.infra.dash/app/cdash/comparisons/tables.py
index 31e268c6f0..8c19d3c776 100644
--- a/csit.infra.dash/app/cdash/comparisons/tables.py
+++ b/csit.infra.dash/app/cdash/comparisons/tables.py
@@ -309,3 +309,65 @@ def comparison_table(
     )
 
     return (title, df_cmp)
+
+
+def filter_table_data(
+        store_table_data: list,
+        table_filter: str
+    ) -> list:
+    """Filter table data using user specified filter.
+
+    :param store_table_data: Table data represented as a list of records.
+    :param table_filter: User specified filter.
+    :type store_table_data: list
+    :type table_filter: str
+    :returns: A new table created by filtering of table data represented as
+        a list of records.
+    :rtype: list
+    """
+
+    # Checks:
+    if not any((table_filter, store_table_data, )):
+        return store_table_data
+
+    def _split_filter_part(filter_part: str) -> tuple:
+        """Split a part of filter into column name, operator and value.
+        A "part of filter" is a sting berween "&&" operator.
+
+        :param filter_part: A part of filter.
+        :type filter_part: str
+        :returns: Column name, operator, value
+        :rtype: tuple[str, str, str|float]
+        """
+        for operator_type in C.OPERATORS:
+            for operator in operator_type:
+                if operator in filter_part:
+                    name_p, val_p = filter_part.split(operator, 1)
+                    name = name_p[name_p.find("{") + 1 : name_p.rfind("}")]
+                    val_p = val_p.strip()
+                    if (val_p[0] == val_p[-1] and val_p[0] in ("'", '"', '`')):
+                        value = val_p[1:-1].replace("\\" + val_p[0], val_p[0])
+                    else:
+                        try:
+                            value = float(val_p)
+                        except ValueError:
+                            value = val_p
+
+                    return name, operator_type[0].strip(), value
+        return (None, None, None)
+
+    df = pd.DataFrame.from_records(store_table_data)
+    for filter_part in table_filter.split(" && "):
+        col_name, operator, filter_value = _split_filter_part(filter_part)
+        if operator == "contains":
+            df = df.loc[df[col_name].str.contains(filter_value, regex=True)]
+        elif operator in ("eq", "ne", "lt", "le", "gt", "ge"):
+            # These operators match pandas series operator method names.
+            df = df.loc[getattr(df[col_name], operator)(filter_value)]
+        elif operator == "datestartswith":
+            # This is a simplification of the front-end filtering logic,
+            # only works with complete fields in standard format.
+            # Currently not used in comparison tables.
+            df = df.loc[df[col_name].str.startswith(filter_value)]
+
+    return df.to_dict("records")