Unescape all known escapes

[sqlconvert.git] / sqlconvert / process_mysql.py

diff --git a/sqlconvert/process_mysql.py b/sqlconvert/process_mysql.py
index b11eccb38f4376f526a7b8b3130e618f7ff58c8f..218655aa976090c7af1a79c6881ca6d35b0311e0 100644 (file)
--- a/sqlconvert/process_mysql.py
+++ b/sqlconvert/process_mysql.py
@@ -1,11 +1,45 @@
 
-from sqlparse.tokens import Name
+from sqlparse.sql import Comment
+from sqlparse import tokens as T
+
+
+def _is_directive_token(token):
+    if isinstance(token, Comment):
+        subtokens = token.tokens
+        if subtokens:
+            comment = subtokens[0]
+            if comment.ttype is T.Comment.Multiline and \
+                    comment.value.startswith('/*!'):
+                return True
+    return False
+
+
+def is_directive_statement(statement):
+    tokens = statement.tokens
+    if not _is_directive_token(tokens[0]):
+        return False
+    if tokens[-1].ttype is not T.Punctuation or tokens[-1].value != ';':
+        return False
+    for token in tokens[1:-1]:
+        if token.ttype not in (T.Newline, T.Whitespace):
+            return False
+    return True
+
+
+def remove_directive_tokens(statement):
+    """Remove /*! directives */ from the first-level"""
+    new_tokens = []
+    for token in statement.tokens:
+        if _is_directive_token(token):
+            continue
+        new_tokens.append(token)
+    statement.tokens = new_tokens
 
 
 def requote_names(token_list):
     """Remove backticks, quote non-lowercase identifiers"""
     for token in token_list.flatten():
-        if token.ttype is Name:
+        if token.ttype is T.Name:
             value = token.value
             if (value[0] == "`") and (value[-1] == "`"):
                 value = value[1:-1]
@@ -13,3 +47,29 @@ def requote_names(token_list):
                 token.normalized = token.value = value
             else:
                 token.normalized = token.value = '"%s"' % value
+
+
+def unescape_strings(token_list):
+    """Unescape strings"""
+    for token in token_list.flatten():
+        if token.ttype is T.String.Single:
+            value = token.value
+            for orig, repl in (
+                ('\\"', '"'),
+                ("\\'", "'"),
+                ("''", "'"),
+                ('\\b', '\b'),
+                ('\\n', '\n'),
+                ('\\r', '\r'),
+                ('\\t', '\t'),
+                ('\\\032', '\032'),
+                ('\\\\', '\\'),
+            ):
+                value = value.replace(orig, repl)
+            token.normalized = token.value = value
+
+
+def process_statement(statement):
+    remove_directive_tokens(statement)
+    requote_names(statement)
+    unescape_strings(statement)