First minimalist test for csvtab implementation.

src/vtab/csvtab.rs

@@ -9,7 +9,7 @@ use libc;
 use {Connection, Error, Result};
 use ffi;
 use types::Null;
-use vtab::{declare_vtab, VTab, VTabCursor};
+use vtab::{declare_vtab, escape_double_quote, VTab, VTabCursor};
 
 pub fn load_module(conn: &Connection) -> Result<()> {
     let aux: Option<()> = None;
@@ -29,6 +29,7 @@ struct CSVTab {
     reader: csv::Reader<File>,
     offset_first_row: u64,
     cols: Vec<String>,
+    eof: bool,
 }
 
 impl VTab<CSVTabCursor> for CSVTab {
@@ -63,7 +64,7 @@ impl VTab<CSVTabCursor> for CSVTab {
                 } else if uc.contains("NO_QUOTE") {
                     reader = reader.quote(0);
                 } else {
-                    cols.push(String::from(arg));
+                    cols.push(escape_double_quote(String::from(arg)));
                 }
             }
         }
@@ -102,6 +103,7 @@ impl VTab<CSVTabCursor> for CSVTab {
             reader: reader,
             offset_first_row: offset_first_row,
             cols: cols,
+            eof: false,
         };
         try!(declare_vtab(db, &sql));
         Ok(vtab)
@@ -137,7 +139,12 @@ impl VTabCursor<CSVTab> for CSVTabCursor {
         unsafe { &mut *(self.base.pVtab as *mut CSVTab) }
     }
 
-    fn filter(&mut self) -> Result<()> {
+    fn filter(&mut self,
+              _idx_num: libc::c_int,
+              _idx_str: *const libc::c_char,
+              _argc: libc::c_int,
+              _argv: *mut *mut ffi::sqlite3_value)
+              -> Result<()> {
         {
             let vtab = self.vtab();
             try!(vtab.reader.seek(vtab.offset_first_row));
@@ -148,8 +155,9 @@ impl VTabCursor<CSVTab> for CSVTabCursor {
     fn next(&mut self) -> Result<()> {
         {
             let vtab = self.vtab();
-            if vtab.reader.done() {
-                return Err(Error::ModuleError(format!("eof")));
+            vtab.eof = vtab.reader.done();
+            if vtab.eof {
+                return Ok(());
             }
 
             vtab.cols.clear();
@@ -163,7 +171,7 @@ impl VTabCursor<CSVTab> for CSVTabCursor {
     }
     fn eof(&self) -> bool {
         let vtab = self.vtab();
-        vtab.reader.done()
+        vtab.eof
     }
     fn column(&self, ctx: *mut ffi::sqlite3_context, col: libc::c_int) -> Result<()> {
         use functions::ToResult;
@@ -190,3 +198,34 @@ impl From<csv::Error> for Error {
         Error::ModuleError(String::from(err.description()))
     }
 }
+
+#[cfg(test)]
+mod test {
+    use Connection;
+    use vtab::csvtab;
+
+    #[test]
+    fn test_csv_module() {
+        let db = Connection::open_in_memory().unwrap();
+        csvtab::load_module(&db).unwrap();
+        db.execute_batch("CREATE VIRTUAL TABLE vtab USING csv('test.csv', HAS_HEADERS)").unwrap();
+
+        let mut s = db.prepare("SELECT rowid, * FROM vtab").unwrap();
+        {
+            let headers = s.column_names();
+            assert_eq!(vec!["rowid", "colA", "colB", "colC"], headers);
+        }
+
+        let rows = s.query(&[]).unwrap();
+        let mut sum = 0;
+        for row in rows {
+            let row = row.unwrap();
+            let id: i64 = row.get(0);
+            // println!("{}, {:?}, {:?}, {:?}", id, row.get::<i32, Value>(1), row.get::<i32, Value>(2), row.get::<i32, Value>(3));
+            sum = sum + id;
+        }
+        assert_eq!(sum, 15);
+
+        db.execute_batch("DROP TABLE vtab").unwrap();
+    }
+}

src/vtab/int_array.rs

@@ -7,27 +7,19 @@ use libc;
 
 use {Connection, Error, Result};
 use ffi;
-use vtab::{declare_vtab, VTab, VTabCursor};
+use vtab::{declare_vtab, escape_double_quote, VTab, VTabCursor};
 
 pub fn create_int_array(conn: &Connection, name: &str) -> Result<Rc<RefCell<Vec<i64>>>> {
     let array = Rc::new(RefCell::new(Vec::new()));
     try!(conn.create_module(name, &INT_ARRAY_MODULE, Some(array.clone())));
-    try!(conn.execute_batch(&format!("CREATE VIRTUAL TABLE temp.{0} USING {0}",
-                                     escape_quote(name.to_string()))));
+    try!(conn.execute_batch(&format!("CREATE VIRTUAL TABLE temp.\"{0}\" USING \"{0}\"",
+                                     escape_double_quote(name.to_string()))));
     Ok(array)
 }
 
 pub fn drop_int_array(conn: &Connection, name: &str) -> Result<()> {
-    conn.execute_batch(&format!("DROP TABLE temp.{0}", escape_quote(name.to_string())))
-}
-
-fn escape_quote(identifier: String) -> String {
-    if identifier.contains('"') {
-        // escape quote by doubling them
-        identifier.replace("\"", "\"\"")
-    } else {
-        identifier
-    }
+    conn.execute_batch(&format!("DROP TABLE temp.\"{0}\"",
+                                escape_double_quote(name.to_string())))
 }
 
 init_module!(INT_ARRAY_MODULE, IntArrayVTab, IntArrayVTabCursor,
@@ -85,7 +77,12 @@ impl VTabCursor<IntArrayVTab> for IntArrayVTabCursor {
     fn vtab(&self) -> &mut IntArrayVTab {
         unsafe { &mut *(self.base.pVtab as *mut IntArrayVTab) }
     }
-    fn filter(&mut self) -> Result<()> {
+    fn filter(&mut self,
+              _idx_num: libc::c_int,
+              _idx_str: *const libc::c_char,
+              _argc: libc::c_int,
+              _argv: *mut *mut ffi::sqlite3_value)
+              -> Result<()> {
         self.i = 0;
         Ok(())
     }

src/vtab/mod.rs

@@ -37,21 +37,39 @@ use ffi;
 //  \-> if not eof { cursor.column or xrowid } else { cursor.xclose }
 //
 
+/// Virtual table instance trait.
 pub trait VTab<C: VTabCursor<Self>>: Sized {
+    /// Create a new instance of a virtual table in response to a CREATE VIRTUAL TABLE statement.
+    /// The `db` parameter is a pointer to the SQLite database connection that is executing the CREATE VIRTUAL TABLE statement.
     fn create(db: *mut ffi::sqlite3,
               aux: *mut libc::c_void,
               args: &[*const libc::c_char])
               -> Result<Self>;
+    /// Determine the best way to access the virtual table.
     fn best_index(&self, info: *mut ffi::sqlite3_index_info);
+    /// Create a new cursor used for accessing a virtual table.
     fn open(&self) -> Result<C>;
 }
 
+/// Virtual table cursor trait.
 pub trait VTabCursor<V: VTab<Self>>: Sized {
+    /// Accessor to the associated virtual table.
     fn vtab(&self) -> &mut V;
-    fn filter(&mut self) -> Result<()>;
+    /// Begin a search of a virtual table.
+    fn filter(&mut self,
+              idx_num: libc::c_int,
+              idx_str: *const libc::c_char,
+              argc: libc::c_int,
+              argv: *mut *mut ffi::sqlite3_value)
+              -> Result<()>;
+    /// Advance cursor to the next row of a result set initiated by `filter`.
     fn next(&mut self) -> Result<()>;
+    /// Must return `false` if the cursor currently points to a valid row of data, or `true` otherwise.
     fn eof(&self) -> bool;
+    /// Find the value for the `i`-th column of the current row. `i` is zero-based so the first column is numbered 0.
+    /// May return its result back to SQLite using one of the specified `ctx`.
     fn column(&self, ctx: *mut ffi::sqlite3_context, i: libc::c_int) -> Result<()>;
+    /// Return the rowid of row that the cursor is currently pointing at.
     fn rowid(&self) -> Result<i64>;
 }
 
@@ -98,6 +116,7 @@ impl InnerConnection {
     }
 }
 
+/// Declare the schema of a virtual table.
 pub fn declare_vtab(db: *mut ffi::sqlite3, sql: &str) -> Result<()> {
     let c_sql = try!(CString::new(sql));
     let rc = unsafe { ffi::sqlite3_declare_vtab(db, c_sql.as_ptr()) };
@@ -108,6 +127,16 @@ pub fn declare_vtab(db: *mut ffi::sqlite3, sql: &str) -> Result<()> {
     }
 }
 
+/// Escape double-quote (`"`) character occurences by doubling them (`""`).
+pub fn escape_double_quote(identifier: String) -> String {
+    if identifier.contains('"') {
+        // escape quote by doubling them
+        identifier.replace("\"", "\"\"")
+    } else {
+        identifier
+    }
+}
+
 // FIXME copy/paste from function.rs
 unsafe extern "C" fn free_boxed_value<T>(p: *mut libc::c_void) {
     let _: Box<T> = Box::from_raw(mem::transmute(p));
@@ -220,14 +249,14 @@ unsafe extern "C" fn $close(cursor: *mut ffi::sqlite3_vtab_cursor) -> libc::c_in
 }
 
 unsafe extern "C" fn $filter(cursor: *mut ffi::sqlite3_vtab_cursor,
-                              _idx_num: libc::c_int,
-                              _idx_str: *const libc::c_char,
-                              _argc: libc::c_int,
-                              _argv: *mut *mut ffi::sqlite3_value)
+                              idx_num: libc::c_int,
+                              idx_str: *const libc::c_char,
+                              argc: libc::c_int,
+                              argv: *mut *mut ffi::sqlite3_value)
                               -> libc::c_int {
     use vtab::cursor_error;
     let cr = cursor as *mut $cursor;
-    cursor_error(cursor, (*cr).filter())
+    cursor_error(cursor, (*cr).filter(idx_num, idx_str, argc, argv))
 }
 unsafe extern "C" fn $next(cursor: *mut ffi::sqlite3_vtab_cursor) -> libc::c_int {
     use vtab::cursor_error;
@@ -242,9 +271,9 @@ unsafe extern "C" fn $column(cursor: *mut ffi::sqlite3_vtab_cursor,
                               ctx: *mut ffi::sqlite3_context,
                               i: libc::c_int)
                               -> libc::c_int {
-    use vtab::cursor_error;
+    use vtab::result_error;
     let cr = cursor as *mut $cursor;
-    cursor_error(cursor, (*cr).column(ctx, i))
+    result_error(ctx, (*cr).column(ctx, i))
 }
 unsafe extern "C" fn $rowid(cursor: *mut ffi::sqlite3_vtab_cursor,
                              p_rowid: *mut ffi::sqlite3_int64)
@@ -262,6 +291,7 @@ unsafe extern "C" fn $rowid(cursor: *mut ffi::sqlite3_vtab_cursor,
     }
 }
 
+/// Virtual table cursors can set an error message by assigning a string to `zErrMsg`.
 pub unsafe fn cursor_error<T>(cursor: *mut ffi::sqlite3_vtab_cursor,
                               result: Result<T>)
                               -> libc::c_int {
@@ -281,6 +311,7 @@ pub unsafe fn cursor_error<T>(cursor: *mut ffi::sqlite3_vtab_cursor,
     }
 }
 
+/// Virtual tables methods can set an error message by assigning a string to `zErrMsg`.
 pub unsafe fn set_err_msg(vtab: *mut ffi::sqlite3_vtab, err_msg: &str) {
     if !(*vtab).zErrMsg.is_null() {
         ffi::sqlite3_free((*vtab).zErrMsg as *mut libc::c_void);
@@ -288,22 +319,34 @@ pub unsafe fn set_err_msg(vtab: *mut ffi::sqlite3_vtab, err_msg: &str) {
     (*vtab).zErrMsg = mprintf(err_msg);
 }
 
-unsafe fn result_error(ctx: *mut ffi::sqlite3_context, err: Error) -> libc::c_int {
+/// To raise an error, the `column` method should use this method to set the error message and return the error code.
+pub unsafe fn result_error<T>(ctx: *mut ffi::sqlite3_context, result: Result<T>) -> libc::c_int {
     use std::error::Error as StdError;
-    match err {
-        Error::SqliteFailure(err, s) => {
-            ffi::sqlite3_result_error_code(ctx, err.extended_code);
+    match result {
+        Ok(_) => ffi::SQLITE_OK,
+        Err(Error::SqliteFailure(err, s)) => {
+            match err.extended_code {
+                ffi::SQLITE_TOOBIG => {
+                    ffi::sqlite3_result_error_toobig(ctx);
+                }
+                ffi::SQLITE_NOMEM => {
+                    ffi::sqlite3_result_error_nomem(ctx);
+                }
+                code => {
+                    ffi::sqlite3_result_error_code(ctx, code);
                     if let Some(Ok(cstr)) = s.map(|s| str_to_cstring(&s)) {
                         ffi::sqlite3_result_error(ctx, cstr.as_ptr(), -1);
                     }
+                }
+            };
             err.extended_code
         }
-        _ => {
-            ffi::sqlite3_result_error_code(ctx, ffi::SQLITE_CORRUPT_VTAB);
+        Err(err) => {
+            ffi::sqlite3_result_error_code(ctx, ffi::SQLITE_ERROR);
             if let Ok(cstr) = str_to_cstring(err.description()) {
                 ffi::sqlite3_result_error(ctx, cstr.as_ptr(), -1);
             }
-            ffi::SQLITE_CORRUPT_VTAB
+            ffi::SQLITE_ERROR
         }
     }
 }

test.csv

@@ -0,0 +1,6 @@
+"colA","colB","colC"
+1,2,3
+a,b,c
+a,"b",c
+"a","b","c .. z"
+"a","b","c,d"