From 41d3519eb4f1dcfe6a5cf9e799f5de56219f50eb Mon Sep 17 00:00:00 2001
From: reilly <tang.ruilin@foxmail.com>
Date: Thu, 5 Oct 2023 00:07:56 +0800
Subject: [PATCH] [test] add test for parser

Signed-off-by: reilly <tang.ruilin@foxmail.com>
---
 src/parser/mod.rs  | 22 +++++++++++++++++++---
 src/parser/stmt.rs |  6 ++++--
 2 files changed, 23 insertions(+), 5 deletions(-)

diff --git a/src/parser/mod.rs b/src/parser/mod.rs
index a2a9c1c..6999cc1 100644
--- a/src/parser/mod.rs
+++ b/src/parser/mod.rs
@@ -26,7 +26,9 @@ use std::collections::BTreeMap;
 use stmt::Statement;
 use token::Token;
 
-use self::stmt::{DropTableStmt, SetStmt, SetVariableType, TransactionIsolationLevel, UpdateStmt};
+use self::stmt::{
+    DropTableStmt, ExplainStmt, SetStmt, SetVariableType, TransactionIsolationLevel, UpdateStmt,
+};
 use self::{
     column::Column,
     operator::Precedence,
@@ -415,6 +417,7 @@ impl Parser {
     fn parse_delete_stmt(&mut self) -> Result<Statement> {
         self.next_expected_keyword(Keyword::From)?;
         let table = self.next_ident()?;
+        self.next_token();
         Ok(Statement::Delete(DeleteTableStmt {
             table,
             r#where: self.parse_clause_where()?,
@@ -710,6 +713,7 @@ impl Parser {
     }
 
     fn parse_drop_stmt(&mut self) -> Result<Statement> {
+        self.next_expected_keyword(Keyword::Table)?;
         Ok(Statement::DropTable(DropTableStmt {
             table: self.next_ident()?,
         }))
@@ -1128,6 +1132,7 @@ impl Parser {
         loop {
             let column = self.next_ident()?;
             self.next_expected_token(Token::Equal)?;
+            self.next_token();
             let expr = self.parse_expression(Precedence::Lowest)?;
             if set.contains_key(&column) {
                 return Err(Error::OtherErr(fmt_err!(
@@ -1136,7 +1141,7 @@ impl Parser {
                 )));
             }
             set.insert(column, expr);
-            if self.peek_token == Token::Comma {
+            if self.peek_token != Token::Comma {
                 self.next_token();
                 break;
             }
@@ -1149,7 +1154,10 @@ impl Parser {
     }
 
     fn parse_explain_stmt(&mut self) -> Result<Statement> {
-        unimplemented!()
+        self.next_token();
+        Ok(Statement::Explain(ExplainStmt {
+            statement: Box::new(self.parse_stmt()?),
+        }))
     }
 
     fn next_token(&mut self) -> &Token {
@@ -1692,6 +1700,14 @@ pub mod test {
     }
 
     test_parser! {
+        explain_wrong_sql: "explain nothing;" => Err(Error::ParseErr("src/parser/mod.rs:86 unexpected token: Token: Ident: nothing".to_owned())),
+        explain_base_sql: "explain drop table person" => Ok(Statement::Explain(ExplainStmt{ statement: Box::new(Statement::DropTable(DropTableStmt { table: "person".to_owned() }))})),
+        update_table_base: "update person set name = 'tangruilin' where id = 1;" => Ok(Statement::Update(UpdateStmt { table: "person".to_owned(), set: BTreeMap::from([
+            ("name".to_owned(), Some(Expression::Literal(Literal::String("tangruilin".to_owned())))),
+        ]), r#where: Some(Expression::Operation(Operation::Equal(Box::new(Expression::Field(None, "id".to_owned())), Box::new(Expression::Literal(Literal::Int(1))))))})),
+        drop_table_base: "drop table person;" => Ok(Statement::DropTable(DropTableStmt { table: "person".to_owned() })),
+        delete_table_base: "delete from person where id = 1;" => Ok(Statement::Delete(DeleteTableStmt { table: "person".to_owned(), r#where: Some(Expression::Operation(Operation::Equal(Box::new(Expression::Field(None, "id".to_owned())), Box::new(Expression::Literal(Literal::Int(1)))))) })),
+        delete_table_without_where: "delete from person;" => Ok(Statement::Delete(DeleteTableStmt { table: "person".to_owned(), r#where: None })),
         insert_table_base: "insert into person (id, name, age) values (1, 'tangruilin', 14)" => Ok(Statement::Insert(InsertStmt {
                 table: "person".to_owned(),
                 columns: Some(["id".to_owned(), "name".to_owned(), "age".to_owned()].to_vec()),
diff --git a/src/parser/stmt.rs b/src/parser/stmt.rs
index 2dd0b7f..5d2f459 100644
--- a/src/parser/stmt.rs
+++ b/src/parser/stmt.rs
@@ -60,8 +60,10 @@ impl std::fmt::Display for BeginStmt {
     }
 }
 
-#[derive(Eq, PartialEq, Debug)]
-pub struct ExplainStmt {}
+#[derive(PartialEq, Debug)]
+pub struct ExplainStmt {
+    pub statement: Box<Statement>,
+}
 #[derive(PartialEq, Debug)]
 pub struct CreateTableStmt {
     pub columns: Vec<Column>,