Merge pull request apache#7 from zhyass/main

Process escape character in quoted string

Author: sundy-li

src/ast/mod.rs

@@ -433,15 +433,14 @@ impl fmt::Display for WindowSpec {
             write!(f, "ORDER BY {}", display_comma_separated(&self.order_by))?;
         }
         if let Some(window_frame) = &self.window_frame {
+            f.write_str(delim)?;
             if let Some(end_bound) = &window_frame.end_bound {
-                f.write_str(delim)?;
                 write!(
                     f,
                     "{} BETWEEN {} AND {}",
                     window_frame.units, window_frame.start_bound, end_bound
                 )?;
             } else {
-                f.write_str(delim)?;
                 write!(f, "{} {}", window_frame.units, window_frame.start_bound)?;
             }
         }

src/parser.rs

@@ -1620,9 +1620,10 @@ impl<'a> Parser<'a> {
         loop {
             if let Some(constraint) = self.parse_optional_table_constraint()? {
                 constraints.push(constraint);
-            } else if let Token::Word(_) = self.peek_token() {
-                columns.push(self.parse_column_def()?);
-            } else if let Token::BackQuotedString(_) = self.peek_token() {
+            } else if matches!(
+                self.peek_token(),
+                Token::Word(_) | Token::BackQuotedString(_)
+            ) {
                 columns.push(self.parse_column_def()?);
             } else {
                 return self.expected("column name or constraint definition", self.peek_token());
@@ -2793,10 +2794,10 @@ impl<'a> Parser<'a> {
             // followed by some joins or (B) another level of nesting.
             let mut table_and_joins = self.parse_table_and_joins()?;
 
-            if !table_and_joins.joins.is_empty() {
-                self.expect_token(&Token::RParen)?;
-                Ok(TableFactor::NestedJoin(Box::new(table_and_joins))) // (A)
-            } else if let TableFactor::NestedJoin(_) = &table_and_joins.relation {
+            if !table_and_joins.joins.is_empty()
+                || matches!(&table_and_joins.relation, TableFactor::NestedJoin(_))
+            {
+                // (A)
                 // (B): `table_and_joins` (what we found inside the parentheses)
                 // is a nested join `(foo JOIN bar)`, not followed by other joins.
                 self.expect_token(&Token::RParen)?;

src/tokenizer.rs

@@ -643,10 +643,9 @@ impl<'a> Tokenizer<'a> {
     ) -> Result<String, TokenizerError> {
         let mut s = String::new();
         chars.next(); // consume the opening quote
-        while let Some(&ch) = chars.peek() {
+        while let Some(ch) = chars.next() {
             match ch {
                 '\'' => {
-                    chars.next(); // consume
                     let escaped_quote = chars.peek().map(|c| *c == '\'').unwrap_or(false);
                     if escaped_quote {
                         s.push('\'');
@@ -655,8 +654,25 @@ impl<'a> Tokenizer<'a> {
                         return Ok(s);
                     }
                 }
+                '\\' => {
+                    if let Some(c) = chars.next() {
+                        match c {
+                            'n' => s.push('\n'),
+                            't' => s.push('\t'),
+                            'r' => s.push('\r'),
+                            'b' => s.push('\u{08}'),
+                            '0' => s.push('\0'),
+                            '\'' => s.push('\''),
+                            '\\' => s.push('\\'),
+                            '\"' => s.push('\"'),
+                            _ => {
+                                s.push('\\');
+                                s.push(c);
+                            }
+                        }
+                    }
+                }
                 _ => {
-                    chars.next(); // consume
                     s.push(ch);
                 }
             }