Custom sql

[datasette-pytables.git] / datasette_pytables / utils.py

diff --git a/datasette_pytables/utils.py b/datasette_pytables/utils.py
new file mode 100644 (file)
index 0000000..b4bd2a0
--- /dev/null
+++ b/datasette_pytables/utils.py
@@ -0,0 +1,28 @@
+from moz_sql_parser import parse
+import re
+
+
+def parse_sql(sql, params):
+    # Table name
+    sql = re.sub(r'(?i)from \[(.*)]', r'from "\g<1>"', sql)
+    # Params
+    for param in params:
+        sql = sql.replace(":" + param, param)
+
+    try:
+        parsed = parse(sql)
+    except:
+        # Propably it's a PyTables expression
+        for token in ['group by', 'order by', 'limit', '']:
+            res = re.search('(?i)where (.*)' + token, sql)
+            if res:
+                modified_sql = re.sub('(?i)where (.*)(' + token + ')', r'\g<2>', sql)
+                parsed = parse(modified_sql)
+                parsed['where'] = res.group(1).strip()
+                break
+
+    # Always a list of fields
+    if type(parsed['select']) is not list:
+        parsed['select'] = [parsed['select']]
+
+    return parsed