Rename mysql2sql -> sqlconvert

[sqlconvert.git] / sqlconvert / process_tokens.py

diff --git a/sqlconvert/process_tokens.py b/sqlconvert/process_tokens.py
new file mode 100644 (file)
index 0000000..1e74ac9
--- /dev/null
+++ b/sqlconvert/process_tokens.py
@@ -0,0 +1,74 @@
+
+from sqlparse import parse
+from sqlparse.compat import PY3
+from sqlparse.tokens import Name, Error, Punctuation, Comment, Newline, \
+    Whitespace
+
+
+def requote_names(token_list):
+    """Remove backticks, quote non-lowercase identifiers"""
+    for token in token_list.flatten():
+        if token.ttype is Name:
+            value = token.value
+            if (value[0] == "`") and (value[-1] == "`"):
+                value = value[1:-1]
+            if value.islower():
+                token.normalized = token.value = value
+            else:
+                token.normalized = token.value = '"%s"' % value
+
+
+def find_error(token_list):
+    """Find an error"""
+    for token in token_list.flatten():
+        if token.ttype is Error:
+            return True
+    return False
+
+
+if PY3:
+    xrange = range
+
+
+class StatementGrouper(object):
+    """Collect lines and reparse until the last statement is complete"""
+
+    def __init__(self, encoding=None):
+        self.lines = []
+        self.statements = []
+        self.encoding = encoding
+
+    def process_line(self, line):
+        self.lines.append(line)
+        self.process_lines()
+
+    def process_lines(self):
+        statements = parse(''.join(self.lines), encoding=self.encoding)
+        last_stmt = statements[-1]
+        for i in xrange(len(last_stmt.tokens) - 1, 0, -1):
+            token = last_stmt.tokens[i]
+            if token.ttype in (Comment.Single, Comment.Multiline,
+                               Newline, Whitespace):
+                continue
+            if token.ttype is Punctuation and token.value == ';':
+                break  # The last statement is complete
+            # The last statement is still incomplete - wait for the next line
+            return
+        self.lines = []
+        self.statements = statements
+
+    def get_statements(self):
+        for stmt in self.statements:
+            yield stmt
+        self.statements = []
+
+    def close(self):
+        if not self.lines:
+            return
+        tokens = parse(''.join(self.lines), encoding=self.encoding)
+        for token in tokens:
+            if (token.ttype not in (Comment.Single, Comment.Multiline,
+                                    Newline, Whitespace)):
+                raise ValueError("Incomplete SQL statement: %s" %
+                                 tokens)
+        return tokens