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18
Cargo.toml
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@ -1,6 +1,22 @@
[package]
name = "datafusion-sql"
name = "sqlparser"
description = "ANSI SQL parser"
version = "0.1.0"
authors = ["Andy Grove <andygrove73@gmail.com>"]
homepage = "https://github.com/andygrove/sqlparser-rs"
documentation = "https://github.com/andygrove/sqlparser-rs"
keywords = [ "sql", "lexer", "parser" ]
repository = "https://github.com/andygrove/sqlparser-rs"
license = "Apache-2.0"
include = [
"src/**/*.rs",
"Cargo.toml",
]
[lib]
name = "sqlparser"
path = "src/lib.rs"
[dependencies]
fnv = "1.0.3"
lazy_static = "1.0"

201
LICENSE
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@ -1,201 +0,0 @@
Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
1. Definitions.
"License" shall mean the terms and conditions for use, reproduction,
and distribution as defined by Sections 1 through 9 of this document.
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otherwise, or (ii) ownership of fifty percent (50%) or more of the
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To apply the Apache License to your work, attach the following
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LICENSE.TXT Normal file
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Apache License
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http://www.apache.org/licenses/
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
1. Definitions.
"License" shall mean the terms and conditions for use, reproduction,
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outstanding shares, or (iii) beneficial ownership of such entity.
"You" (or "Your") shall mean an individual or Legal Entity
exercising permissions granted by this License.
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including but not limited to software source code, documentation
source, and configuration files.
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transformation or translation of a Source form, including but
not limited to compiled object code, generated documentation,
and conversions to other media types.
"Work" shall mean the work of authorship, whether in Source or
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copyright notice that is included in or attached to the work
(an example is provided in the Appendix below).
"Derivative Works" shall mean any work, whether in Source or Object
form, that is based on (or derived from) the Work and for which the
editorial revisions, annotations, elaborations, or other modifications
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of this License, Derivative Works shall not include works that remain
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"Contribution" shall mean any work of authorship, including
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4. Redistribution. You may reproduce and distribute copies of the
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of your accepting any such warranty or additional liability.
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See the License for the specific language governing permissions and
limitations under the License.

13
README.md
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@ -1,12 +1,3 @@
# datafusion-sql
This is a work-in-progress to develop a new version of the DataFusion SQL Parser.
Goals for this version:
- Support for custom SQL dialects, so other projects can implement their own parsers easily
- Good error reporting (e.g. show line / column numbers and descriptive messages)
- Zero-copy of tokens when parsing
- Concise code
- Full support for ANSI SQL:2011 standard
# SQL Parser
TBD

20
examples/parse_sql.rs
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@ -1,20 +0,0 @@
use std::sync::{Arc, Mutex};
extern crate datafusion_sql;
use datafusion_sql::ansi::tokenizer::ANSISQLTokenizer;
use datafusion_sql::ansi::parser::ANSISQLParser;
use datafusion_sql::tokenizer::*;
use datafusion_sql::parser::*;
fn main() {
let sql = "SELECT 1 + 1";
// Create parsers
match ANSISQLParser::parse(sql).unwrap() {
Some(ast) => println!("{:?}", ast),
_ => {}
}
}

3
src/ansi/mod.rs
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pub mod tokenizer;
pub mod parser;

70
src/ansi/parser.rs
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use std::cmp::PartialEq;
use std::fmt::Debug;
//use std::rc::Rc;
//use std::sync::{Arc, Mutex};
use super::tokenizer::ANSISQLTokenizer;
use super::super::tokenizer::*;
use super::super::parser::*;
pub struct ANSISQLParser {
tokenizer: Box<SQLTokenizer>
}
impl ANSISQLParser where {
pub fn parse(sql: &str) -> Result<Option<Box<SQLExpr>>, ParserError> {
let mut parser = ANSISQLParser { tokenizer: Box::new(ANSISQLTokenizer::new(sql)) };
parser.parse_expr()
}
}
impl SQLParser for ANSISQLParser {
fn parse_expr(&mut self) -> Result<Option<Box<SQLExpr>>, ParserError> {
let precedence: usize = 0;
let mut e = self.parse_prefix()?;
match e {
Some(mut expr) => {
while let Some(token) = self.tokenizer.peek_token()? {
let next_precedence = self.tokenizer.precedence(&token);
if precedence >= next_precedence {
break;
}
expr = self.parse_infix(&expr, next_precedence)?.unwrap(); //TODO: fix me
}
Ok(Some(expr))
}
_ => {
Ok(None)
}
}
}
fn parse_prefix(&mut self) -> Result<Option<Box<SQLExpr>>, ParserError> {
match self.tokenizer.next_token()? {
Some(SQLToken::Keyword(ref k)) => match k.to_uppercase().as_ref() {
"INSERT" => unimplemented!(),
"UPDATE" => unimplemented!(),
"DELETE" => unimplemented!(),
"SELECT" => unimplemented!(),
"CREATE" => unimplemented!(),
_ => unimplemented!()
},
_ => unimplemented!()
}
}
fn parse_infix(&mut self, _left: &SQLExpr, _precedence: usize) -> Result<Option<Box<SQLExpr>>, ParserError> {
unimplemented!()
}
}

56
src/ansi/tokenizer.rs
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@ -1,56 +0,0 @@
use std::cmp::PartialEq;
use std::fmt::Debug;
use super::super::tokenizer::*;
pub struct ANSISQLTokenizer {
chars: CharSeq
}
impl ANSISQLTokenizer {
pub fn new(sql: &str) -> Self {
ANSISQLTokenizer { chars: CharSeq::new(sql) }
}
}
impl SQLTokenizer for ANSISQLTokenizer {
fn precedence(&self, _token: &SQLToken) -> usize {
unimplemented!()
}
fn peek_token(&mut self) -> Result<Option<SQLToken>, TokenizerError> {
unimplemented!()
}
fn next_token(&mut self) -> Result<Option<SQLToken>, TokenizerError> {
match self.chars.next() {
Some(ch) => match ch {
' ' | '\t' | '\n' => Ok(Some(SQLToken::Whitespace(ch))),
'0' ... '9' => {
let mut s = String::new();
s.push(ch);
while let Some(&ch) = self.chars.peek() {
match ch {
'0' ... '9' => {
self.chars.next(); // consume
s.push(ch);
},
_ => break
}
}
Ok(Some(SQLToken::Literal(s)))
},
'+' => Ok(Some(SQLToken::Plus)),
'-' => Ok(Some(SQLToken::Minus)),
'*' => Ok(Some(SQLToken::Mult)),
'/' => Ok(Some(SQLToken::Divide)),
_ => Err(TokenizerError::UnexpectedChar(ch,Position::new(0, 0)))
},
None => Ok(None)
}
}
}

25
src/lib.rs
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@ -1,3 +1,22 @@
pub mod ansi;
pub mod tokenizer;
pub mod parser;
// Copyright 2018 Grove Enterprises LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
extern crate fnv;
#[macro_use]
extern crate lazy_static;
pub mod sqlast;
pub mod sqlparser;
pub mod sqltokenizer;

106
src/parser.rs
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@ -1,106 +0,0 @@
use std::cmp::PartialEq;
use std::fmt::Debug;
use super::tokenizer::*;
// https://jakewheat.github.io/sql-overview/sql-2011-foundation-grammar.html
/// ANSI SQL:2011 Data Types
#[derive(Debug)]
pub enum SQLDataType {
/// BOOLEAN
Boolean,
/// NUMERIC, DECIMAL, DEC
Numeric { precision: usize, scale: Option<usize> },
/// SMALLINT
SmallInt,
/// INT, INTEGER
Int,
/// BIGINT
BigInt,
/// Floating point: `FLOAT(precision)`
Float(usize),
/// REAL
Real,
/// Double: `DOUBLE PRECISION`
Double,
/// Fixed-length character. `CHAR, CHARACTER`
Char(usize),
/// Variable-length character: `VARCHAR, CHARACTER VARYING, CHAR VARYING`
VarChar(usize),
/// Character Large Object: `CHARACTER LARGE OBJECT, CHAR LARGE OBJECT, CLOB`
Clob(usize),
/// Fixed-length character. `NCHAR, NATIONAL CHAR, NATIONAL CHARACTER`
NChar(usize),
/// Variable-length character: `NCHAR VARYING, NATIONAL CHARACTER VARYING, NATIONAL CHAR VARYING`
NVarChar(usize),
/// National Character Large Object: `NATIONAL CHARACTER LARGE OBJECT, NCHAR LARGE OBJECT, NCLOB`
NClob(usize),
/// Fixed-length binary
Binary(usize),
/// Variable-length binary
VarBinary(usize),
/// Binary large object
Blob(usize),
/// Date
Date,
/// Time: `TIME [(precision)] [WITH TIME ZONE | WITHOUT TIME ZONE]`
Time { precision: usize, tz: bool },
/// Time: `TIMESTAMP [(precision)] [WITH TIME ZONE | WITHOUT TIME ZONE]`
Timestamp { precision: usize, tz: bool },
}
#[derive(Debug)]
pub enum SQLOperator {
Plus,
Minus,
Mult,
Div,
Eq,
Gt,
GtEq,
Lt,
LtEq,
}
/// SQL Expressions
#[derive(Debug)]
pub enum SQLExpr{
/// Identifier e.g. table name or column name
Identifier(String),
/// Literal value
Literal(String),
/// Binary expression e.g. `1 + 2` or `fname LIKE "A%"`
Binary(Box<SQLExpr>, SQLOperator, Box<SQLExpr>),
/// Function invocation with function name and list of argument expressions
FunctionCall(String, Vec<SQLExpr>),
Insert,
Update,
Delete,
Select,
CreateTable,
}
#[derive(Debug)]
pub enum ParserError {
WrongToken { expected: Vec<SQLToken>, actual: SQLToken, line: usize, col: usize },
Custom(String)
}
impl From<TokenizerError> for ParserError {
fn from(e: TokenizerError) -> Self {
ParserError::Custom(format!("{:?}", e))
}
}
pub trait SQLParser {
fn parse_expr(&mut self) -> Result<Option<Box<SQLExpr>>, ParserError>;
/// parse the prefix and stop once an infix operator is reached
fn parse_prefix(&mut self) -> Result<Option<Box<SQLExpr>>, ParserError> ;
/// parse the next infix expression, returning None if the precedence has changed
fn parse_infix(&mut self, left: &SQLExpr, precedence: usize) -> Result<Option<Box<SQLExpr>>, ParserError>;
}

122
src/sqlast.rs Normal file
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// Copyright 2018 Grove Enterprises LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//! SQL Abstract Syntax Tree (AST) types
/// Supported file types for `CREATE EXTERNAL TABLE`
#[derive(Debug, Clone, PartialEq)]
pub enum FileType {
CSV,
NdJson,
Parquet,
}
/// SQL Abstract Syntax Tree (AST)
#[derive(Debug, Clone, PartialEq)]
pub enum ASTNode {
SQLIdentifier(String),
SQLWildcard,
SQLCompoundIdentifier(Vec<String>),
SQLIsNull(Box<ASTNode>),
SQLIsNotNull(Box<ASTNode>),
SQLBinaryExpr {
left: Box<ASTNode>,
op: SQLOperator,
right: Box<ASTNode>,
},
SQLCast {
expr: Box<ASTNode>,
data_type: SQLType,
},
SQLNested(Box<ASTNode>),
SQLUnary {
operator: SQLOperator,
rex: Box<ASTNode>,
},
SQLLiteralLong(i64),
SQLLiteralDouble(f64),
SQLLiteralString(String),
SQLFunction {
id: String,
args: Vec<ASTNode>,
},
SQLOrderBy {
expr: Box<ASTNode>,
asc: bool,
},
SQLSelect {
projection: Vec<ASTNode>,
relation: Option<Box<ASTNode>>,
selection: Option<Box<ASTNode>>,
order_by: Option<Vec<ASTNode>>,
group_by: Option<Vec<ASTNode>>,
having: Option<Box<ASTNode>>,
limit: Option<Box<ASTNode>>,
},
SQLCreateTable {
/// Table name
name: String,
/// Optional schema
columns: Vec<SQLColumnDef>,
/// File type (CSV or Parquet)
file_type: FileType,
/// For CSV files, indicate whether the file has a header row or not
header_row: bool,
/// Path to file or directory contianing files
location: String,
},
}
/// SQL column definition
#[derive(Debug, Clone, PartialEq)]
pub struct SQLColumnDef {
pub name: String,
pub data_type: SQLType,
pub allow_null: bool,
}
/// SQL datatypes for literals in SQL statements
#[derive(Debug, Clone, PartialEq)]
pub enum SQLType {
Boolean,
UInt8,
UInt16,
UInt32,
UInt64,
Int8,
Int16,
Int32,
Int64,
Float32,
Double64,
Utf8(usize),
}
/// SQL Operator
#[derive(Debug, PartialEq, Clone)]
pub enum SQLOperator {
Plus,
Minus,
Multiply,
Divide,
Modulus,
Gt,
Lt,
GtEq,
LtEq,
Eq,
NotEq,
And,
Or,
}

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// Copyright 2018 Grove Enterprises LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//! SQL Parser
use super::sqlast::*;
use super::sqltokenizer::*;
#[derive(Debug, Clone)]
pub enum ParserError {
TokenizerError(String),
ParserError(String),
}
macro_rules! parser_err {
($MSG:expr) => {
Err(ParserError::ParserError($MSG.to_string()))
};
}
impl From<TokenizerError> for ParserError {
fn from(e: TokenizerError) -> Self {
ParserError::TokenizerError(format!("{:?}", e))
}
}
/// SQL Parser
pub struct Parser {
tokens: Vec<Token>,
index: usize,
}
impl Parser {
/// Parse the specified tokens
pub fn new(tokens: Vec<Token>) -> Self {
Parser {
tokens: tokens,
index: 0,
}
}
/// Parse a SQL statement and produce an Abstract Syntax Tree (AST)
pub fn parse_sql(sql: String) -> Result<ASTNode, ParserError> {
let mut tokenizer = Tokenizer::new(&sql);
let tokens = tokenizer.tokenize()?;
let mut parser = Parser::new(tokens);
parser.parse()
}
/// Parse a new expression
pub fn parse(&mut self) -> Result<ASTNode, ParserError> {
self.parse_expr(0)
}
/// Parse tokens until the precedence changes
fn parse_expr(&mut self, precedence: u8) -> Result<ASTNode, ParserError> {
// println!("parse_expr() precendence = {}", precedence);
let mut expr = self.parse_prefix()?;
// println!("parsed prefix: {:?}", expr);
loop {
let next_precedence = self.get_next_precedence()?;
if precedence >= next_precedence {
// println!("break on precedence change ({} >= {})", precedence, next_precedence);
break;
}
if let Some(infix_expr) = self.parse_infix(expr.clone(), next_precedence)? {
// println!("parsed infix: {:?}", infix_expr);
expr = infix_expr;
}
}
// println!("parse_expr() returning {:?}", expr);
Ok(expr)
}
/// Parse an expression prefix
fn parse_prefix(&mut self) -> Result<ASTNode, ParserError> {
match self.next_token() {
Some(t) => {
match t {
Token::Keyword(k) => match k.to_uppercase().as_ref() {
"SELECT" => Ok(self.parse_select()?),
"CREATE" => Ok(self.parse_create()?),
_ => return parser_err!(format!("No prefix parser for keyword {}", k)),
},
Token::Mult => Ok(ASTNode::SQLWildcard),
Token::Identifier(id) => {
match self.peek_token() {
Some(Token::LParen) => {
self.next_token(); // skip lparen
match id.to_uppercase().as_ref() {
"CAST" => self.parse_cast_expression(),
_ => {
let args = self.parse_expr_list()?;
self.next_token(); // skip rparen
Ok(ASTNode::SQLFunction { id, args })
}
}
}
Some(Token::Period) => {
let mut id_parts: Vec<String> = vec![id];
while self.peek_token() == Some(Token::Period) {
self.consume_token(&Token::Period)?;
match self.next_token() {
Some(Token::Identifier(id)) => id_parts.push(id),
_ => {
return parser_err!(format!(
"Error parsing compound identifier"
))
}
}
}
Ok(ASTNode::SQLCompoundIdentifier(id_parts))
}
_ => Ok(ASTNode::SQLIdentifier(id)),
}
}
Token::Number(ref n) if n.contains(".") => match n.parse::<f64>() {
Ok(n) => Ok(ASTNode::SQLLiteralDouble(n)),
Err(e) => parser_err!(format!("Could not parse '{}' as i64: {}", n, e)),
},
Token::Number(ref n) => match n.parse::<i64>() {
Ok(n) => Ok(ASTNode::SQLLiteralLong(n)),
Err(e) => parser_err!(format!("Could not parse '{}' as i64: {}", n, e)),
},
Token::String(ref s) => Ok(ASTNode::SQLLiteralString(s.to_string())),
_ => parser_err!(format!(
"Prefix parser expected a keyword but found {:?}",
t
)),
}
}
None => parser_err!(format!("Prefix parser expected a keyword but hit EOF")),
}
}
/// Parse a SQL CAST function e.g. `CAST(expr AS FLOAT)`
fn parse_cast_expression(&mut self) -> Result<ASTNode, ParserError> {
let expr = self.parse_expr(0)?;
self.consume_token(&Token::Keyword("AS".to_string()))?;
let data_type = self.parse_data_type()?;
self.consume_token(&Token::RParen)?;
Ok(ASTNode::SQLCast {
expr: Box::new(expr),
data_type,
})
}
/// Parse an expression infix (typically an operator)
fn parse_infix(
&mut self,
expr: ASTNode,
precedence: u8,
) -> Result<Option<ASTNode>, ParserError> {
match self.next_token() {
Some(tok) => match tok {
Token::Keyword(ref k) => if k == "IS" {
if self.parse_keywords(vec!["NULL"]) {
Ok(Some(ASTNode::SQLIsNull(Box::new(expr))))
} else if self.parse_keywords(vec!["NOT", "NULL"]) {
Ok(Some(ASTNode::SQLIsNotNull(Box::new(expr))))
} else {
parser_err!("Invalid tokens after IS")
}
} else {
Ok(Some(ASTNode::SQLBinaryExpr {
left: Box::new(expr),
op: self.to_sql_operator(&tok)?,
right: Box::new(self.parse_expr(precedence)?),
}))
},
Token::Eq
| Token::Neq
| Token::Gt
| Token::GtEq
| Token::Lt
| Token::LtEq
| Token::Plus
| Token::Minus
| Token::Mult
| Token::Mod
| Token::Div => Ok(Some(ASTNode::SQLBinaryExpr {
left: Box::new(expr),
op: self.to_sql_operator(&tok)?,
right: Box::new(self.parse_expr(precedence)?),
})),
_ => parser_err!(format!("No infix parser for token {:?}", tok)),
},
None => Ok(None),
}
}
/// Convert a token operator to an AST operator
fn to_sql_operator(&self, tok: &Token) -> Result<SQLOperator, ParserError> {
match tok {
&Token::Eq => Ok(SQLOperator::Eq),
&Token::Neq => Ok(SQLOperator::NotEq),
&Token::Lt => Ok(SQLOperator::Lt),
&Token::LtEq => Ok(SQLOperator::LtEq),
&Token::Gt => Ok(SQLOperator::Gt),
&Token::GtEq => Ok(SQLOperator::GtEq),
&Token::Plus => Ok(SQLOperator::Plus),
&Token::Minus => Ok(SQLOperator::Minus),
&Token::Mult => Ok(SQLOperator::Multiply),
&Token::Div => Ok(SQLOperator::Divide),
&Token::Mod => Ok(SQLOperator::Modulus),
&Token::Keyword(ref k) if k == "AND" => Ok(SQLOperator::And),
&Token::Keyword(ref k) if k == "OR" => Ok(SQLOperator::Or),
_ => parser_err!(format!("Unsupported SQL operator {:?}", tok)),
}
}
/// Get the precedence of the next token
fn get_next_precedence(&self) -> Result<u8, ParserError> {
if self.index < self.tokens.len() {
self.get_precedence(&self.tokens[self.index])
} else {
Ok(0)
}
}
/// Get the precedence of a token
fn get_precedence(&self, tok: &Token) -> Result<u8, ParserError> {
//println!("get_precedence() {:?}", tok);
match tok {
&Token::Keyword(ref k) if k == "OR" => Ok(5),
&Token::Keyword(ref k) if k == "AND" => Ok(10),
&Token::Keyword(ref k) if k == "IS" => Ok(15),
&Token::Eq | &Token::Lt | &Token::LtEq | &Token::Neq | &Token::Gt | &Token::GtEq => {
Ok(20)
}
&Token::Plus | &Token::Minus => Ok(30),
&Token::Mult | &Token::Div | &Token::Mod => Ok(40),
_ => Ok(0),
}
}
/// Peek at the next token
fn peek_token(&mut self) -> Option<Token> {
if self.index < self.tokens.len() {
Some(self.tokens[self.index].clone())
} else {
None
}
}
/// Get the next token and increment the token index
fn next_token(&mut self) -> Option<Token> {
if self.index < self.tokens.len() {
self.index = self.index + 1;
Some(self.tokens[self.index - 1].clone())
} else {
None
}
}
/// Get the previous token and decrement the token index
fn prev_token(&mut self) -> Option<Token> {
if self.index > 0 {
Some(self.tokens[self.index - 1].clone())
} else {
None
}
}
/// Look for an expected keyword and consume it if it exists
fn parse_keyword(&mut self, expected: &'static str) -> bool {
match self.peek_token() {
Some(Token::Keyword(k)) => {
if expected.eq_ignore_ascii_case(k.as_str()) {
self.next_token();
true
} else {
false
}
}
_ => false,
}
}
/// Look for an expected sequence of keywords and consume them if they exist
fn parse_keywords(&mut self, keywords: Vec<&'static str>) -> bool {
let index = self.index;
for keyword in keywords {
//println!("parse_keywords aborting .. expecting {}", keyword);
if !self.parse_keyword(&keyword) {
//println!("parse_keywords aborting .. did not find {}", keyword);
// reset index and return immediately
self.index = index;
return false;
}
}
true
}
// fn parse_identifier(&mut self) -> Result<ASTNode::SQLIdentifier, Err> {
// let expr = self.parse_expr()?;
// match expr {
// Some(ASTNode::SQLIdentifier { .. }) => Ok(expr),
// _ => parser_err!(format!("Expected identifier but found {:?}", expr)))
// }
// }
/// Consume the next token if it matches the expected token, otherwise return an error
fn consume_token(&mut self, expected: &Token) -> Result<bool, ParserError> {
match self.peek_token() {
Some(ref t) => if *t == *expected {
self.next_token();
Ok(true)
} else {
Ok(false)
},
_ => parser_err!(format!(
"expected token {:?} but was {:?}",
expected,
self.prev_token()
)),
}
}
/// Parse a SQL CREATE statement
fn parse_create(&mut self) -> Result<ASTNode, ParserError> {
if self.parse_keywords(vec!["EXTERNAL", "TABLE"]) {
match self.next_token() {
Some(Token::Identifier(id)) => {
// parse optional column list (schema)
let mut columns = vec![];
if self.consume_token(&Token::LParen)? {
loop {
if let Some(Token::Identifier(column_name)) = self.next_token() {
if let Ok(data_type) = self.parse_data_type() {
let allow_null = if self.parse_keywords(vec!["NOT", "NULL"]) {
false
} else if self.parse_keyword("NULL") {
true
} else {
true
};
match self.peek_token() {
Some(Token::Comma) => {
self.next_token();
columns.push(SQLColumnDef {
name: column_name,
data_type: data_type,
allow_null,
});
}
Some(Token::RParen) => {
self.next_token();
columns.push(SQLColumnDef {
name: column_name,
data_type: data_type,
allow_null,
});
break;
}
_ => {
return parser_err!(
"Expected ',' or ')' after column definition"
);
}
}
} else {
return parser_err!(
"Error parsing data type in column definition"
);
}
} else {
return parser_err!("Error parsing column name");
}
}
}
//println!("Parsed {} column defs", columns.len());
let mut headers = true;
let file_type: FileType = if self.parse_keywords(vec!["STORED", "AS", "CSV"]) {
if self.parse_keywords(vec!["WITH", "HEADER", "ROW"]) {
headers = true;
} else if self.parse_keywords(vec!["WITHOUT", "HEADER", "ROW"]) {
headers = false;
}
FileType::CSV
} else if self.parse_keywords(vec!["STORED", "AS", "NDJSON"]) {
FileType::NdJson
} else if self.parse_keywords(vec!["STORED", "AS", "PARQUET"]) {
FileType::Parquet
} else {
return parser_err!(format!(
"Expected 'STORED AS' clause, found {:?}",
self.peek_token()
));
};
let location: String = if self.parse_keywords(vec!["LOCATION"]) {
self.parse_literal_string()?
} else {
return parser_err!("Missing 'LOCATION' clause");
};
Ok(ASTNode::SQLCreateTable {
name: id,
columns,
file_type,
header_row: headers,
location,
})
}
_ => parser_err!(format!(
"Unexpected token after CREATE EXTERNAL TABLE: {:?}",
self.peek_token()
)),
}
} else {
parser_err!(format!(
"Unexpected token after CREATE: {:?}",
self.peek_token()
))
}
}
/// Parse a literal integer/long
fn parse_literal_int(&mut self) -> Result<i64, ParserError> {
match self.next_token() {
Some(Token::Number(s)) => s.parse::<i64>().map_err(|e| {
ParserError::ParserError(format!("Could not parse '{}' as i64: {}", s, e))
}),
other => parser_err!(format!("Expected literal int, found {:?}", other)),
}
}
/// Parse a literal string
fn parse_literal_string(&mut self) -> Result<String, ParserError> {
match self.next_token() {
Some(Token::String(ref s)) => Ok(s.clone()),
other => parser_err!(format!("Expected literal string, found {:?}", other)),
}
}
/// Parse a SQL datatype (in the context of a CREATE TABLE statement for example)
fn parse_data_type(&mut self) -> Result<SQLType, ParserError> {
match self.next_token() {
Some(Token::Keyword(k)) => match k.to_uppercase().as_ref() {
"BOOLEAN" => Ok(SQLType::Boolean),
"UINT8" => Ok(SQLType::UInt8),
"UINT16" => Ok(SQLType::UInt16),
"UINT32" => Ok(SQLType::UInt32),
"UINT64" => Ok(SQLType::UInt64),
"INT8" => Ok(SQLType::Int8),
"INT16" => Ok(SQLType::Int16),
"INT32" | "INT" | "INTEGER" => Ok(SQLType::Int32),
"INT64" | "LONG" => Ok(SQLType::Int64),
"FLOAT32" | "FLOAT" => Ok(SQLType::Float32),
"FLOAT64" | "DOUBLE" => Ok(SQLType::Double64),
"UTF8" | "VARCHAR" | "STRING" => {
// optional length
if self.consume_token(&Token::LParen)? {
let n = self.parse_literal_int()?;
self.consume_token(&Token::RParen)?;
Ok(SQLType::Utf8(n as usize))
} else {
Ok(SQLType::Utf8(100 as usize))
}
}
_ => parser_err!(format!("Invalid data type '{:?}'", k)),
},
other => parser_err!(format!("Invalid data type: '{:?}'", other)),
}
}
/// Parse a SELECT statement
fn parse_select(&mut self) -> Result<ASTNode, ParserError> {
let projection = self.parse_expr_list()?;
let relation: Option<Box<ASTNode>> = if self.parse_keyword("FROM") {
//TODO: add support for JOIN
Some(Box::new(self.parse_expr(0)?))
} else {
None
};
let selection = if self.parse_keyword("WHERE") {
Some(Box::new(self.parse_expr(0)?))
} else {
None
};
let group_by = if self.parse_keywords(vec!["GROUP", "BY"]) {
Some(self.parse_expr_list()?)
} else {
None
};
let having = if self.parse_keyword("HAVING") {
Some(Box::new(self.parse_expr(0)?))
} else {
None
};
let order_by = if self.parse_keywords(vec!["ORDER", "BY"]) {
Some(self.parse_order_by_expr_list()?)
} else {
None
};
let limit = if self.parse_keyword("LIMIT") {
self.parse_limit()?
} else {
None
};
if let Some(next_token) = self.peek_token() {
parser_err!(format!(
"Unexpected token at end of SELECT: {:?}",
next_token
))
} else {
Ok(ASTNode::SQLSelect {
projection,
selection,
relation,
limit,
order_by,
group_by,
having,
})
}
}
/// Parse a comma-delimited list of SQL expressions
fn parse_expr_list(&mut self) -> Result<Vec<ASTNode>, ParserError> {
let mut expr_list: Vec<ASTNode> = vec![];
loop {
expr_list.push(self.parse_expr(0)?);
if let Some(t) = self.peek_token() {
if t == Token::Comma {
self.next_token();
} else {
break;
}
} else {
//EOF
break;
}
}
Ok(expr_list)
}
/// Parse a comma-delimited list of SQL ORDER BY expressions
fn parse_order_by_expr_list(&mut self) -> Result<Vec<ASTNode>, ParserError> {
let mut expr_list: Vec<ASTNode> = vec![];
loop {
let expr = self.parse_expr(0)?;
// look for optional ASC / DESC specifier
let asc = match self.peek_token() {
Some(Token::Keyword(k)) => {
self.next_token(); // consume it
match k.to_uppercase().as_ref() {
"ASC" => true,
"DESC" => false,
_ => {
return parser_err!(format!(
"Invalid modifier for ORDER BY expression: {:?}",
k
))
}
}
}
Some(Token::Comma) => true,
Some(other) => {
return parser_err!(format!("Unexpected token after ORDER BY expr: {:?}", other))
}
None => true,
};
expr_list.push(ASTNode::SQLOrderBy {
expr: Box::new(expr),
asc,
});
if let Some(t) = self.peek_token() {
if t == Token::Comma {
self.next_token();
} else {
break;
}
} else {
// EOF
break;
}
}
Ok(expr_list)
}
/// Parse a LIMIT clause
fn parse_limit(&mut self) -> Result<Option<Box<ASTNode>>, ParserError> {
if self.parse_keyword("ALL") {
Ok(None)
} else {
self.parse_literal_int()
.map(|n| Some(Box::new(ASTNode::SQLLiteralLong(n))))
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn parse_simple_select() {
let sql = String::from("SELECT id, fname, lname FROM customer WHERE id = 1 LIMIT 5");
let ast = parse_sql(&sql);
match ast {
ASTNode::SQLSelect {
projection, limit, ..
} => {
assert_eq!(3, projection.len());
assert_eq!(Some(Box::new(ASTNode::SQLLiteralLong(5))), limit);
}
_ => assert!(false),
}
}
#[test]
fn parse_select_wildcard() {
let sql = String::from("SELECT * FROM customer");
let ast = parse_sql(&sql);
match ast {
ASTNode::SQLSelect { projection, .. } => {
assert_eq!(1, projection.len());
assert_eq!(ASTNode::SQLWildcard, projection[0]);
}
_ => assert!(false),
}
}
#[test]
fn parse_select_count_wildcard() {
let sql = String::from("SELECT COUNT(*) FROM customer");
let ast = parse_sql(&sql);
match ast {
ASTNode::SQLSelect { projection, .. } => {
assert_eq!(1, projection.len());
assert_eq!(
ASTNode::SQLFunction {
id: "COUNT".to_string(),
args: vec![ASTNode::SQLWildcard],
},
projection[0]
);
}
_ => assert!(false),
}
}
#[test]
fn parse_select_string_predicate() {
let sql = String::from(
"SELECT id, fname, lname FROM customer \
WHERE salary != 'Not Provided' AND salary != ''",
);
let _ast = parse_sql(&sql);
//TODO: add assertions
}
#[test]
fn parse_projection_nested_type() {
let sql = String::from("SELECT customer.address.state FROM foo");
let _ast = parse_sql(&sql);
//TODO: add assertions
}
#[test]
fn parse_compound_expr_1() {
use self::ASTNode::*;
use self::SQLOperator::*;
let sql = String::from("a + b * c");
let ast = parse_sql(&sql);
assert_eq!(
SQLBinaryExpr {
left: Box::new(SQLIdentifier("a".to_string())),
op: Plus,
right: Box::new(SQLBinaryExpr {
left: Box::new(SQLIdentifier("b".to_string())),
op: Multiply,
right: Box::new(SQLIdentifier("c".to_string()))
})
},
ast
);
}
#[test]
fn parse_compound_expr_2() {
use self::ASTNode::*;
use self::SQLOperator::*;
let sql = String::from("a * b + c");
let ast = parse_sql(&sql);
assert_eq!(
SQLBinaryExpr {
left: Box::new(SQLBinaryExpr {
left: Box::new(SQLIdentifier("a".to_string())),
op: Multiply,
right: Box::new(SQLIdentifier("b".to_string()))
}),
op: Plus,
right: Box::new(SQLIdentifier("c".to_string()))
},
ast
);
}
#[test]
fn parse_is_null() {
use self::ASTNode::*;
let sql = String::from("a IS NULL");
let ast = parse_sql(&sql);
assert_eq!(SQLIsNull(Box::new(SQLIdentifier("a".to_string()))), ast);
}
#[test]
fn parse_is_not_null() {
use self::ASTNode::*;
let sql = String::from("a IS NOT NULL");
let ast = parse_sql(&sql);
assert_eq!(SQLIsNotNull(Box::new(SQLIdentifier("a".to_string()))), ast);
}
#[test]
fn parse_select_order_by() {
let sql = String::from(
"SELECT id, fname, lname FROM customer WHERE id < 5 ORDER BY lname ASC, fname DESC",
);
let ast = parse_sql(&sql);
match ast {
ASTNode::SQLSelect { order_by, .. } => {
assert_eq!(
Some(vec![
ASTNode::SQLOrderBy {
expr: Box::new(ASTNode::SQLIdentifier("lname".to_string())),
asc: true,
},
ASTNode::SQLOrderBy {
expr: Box::new(ASTNode::SQLIdentifier("fname".to_string())),
asc: false,
},
]),
order_by
);
}
_ => assert!(false),
}
}
#[test]
fn parse_select_group_by() {
let sql = String::from("SELECT id, fname, lname FROM customer GROUP BY lname, fname");
let ast = parse_sql(&sql);
match ast {
ASTNode::SQLSelect { group_by, .. } => {
assert_eq!(
Some(vec![
ASTNode::SQLIdentifier("lname".to_string()),
ASTNode::SQLIdentifier("fname".to_string()),
]),
group_by
);
}
_ => assert!(false),
}
}
#[test]
fn parse_limit_accepts_all() {
let sql = String::from("SELECT id, fname, lname FROM customer WHERE id = 1 LIMIT ALL");
let ast = parse_sql(&sql);
match ast {
ASTNode::SQLSelect {
projection, limit, ..
} => {
assert_eq!(3, projection.len());
assert_eq!(None, limit);
}
_ => assert!(false),
}
}
#[test]
fn parse_cast() {
let sql = String::from("SELECT CAST(id AS DOUBLE) FROM customer");
let ast = parse_sql(&sql);
match ast {
ASTNode::SQLSelect { projection, .. } => {
assert_eq!(1, projection.len());
assert_eq!(
ASTNode::SQLCast {
expr: Box::new(ASTNode::SQLIdentifier("id".to_string())),
data_type: SQLType::Double64
},
projection[0]
);
}
_ => assert!(false),
}
}
#[test]
fn parse_create_external_table_csv_with_header_row() {
let sql = String::from(
"CREATE EXTERNAL TABLE uk_cities (\
name VARCHAR(100) NOT NULL,\
lat DOUBLE NULL,\
lng DOUBLE NULL) \
STORED AS CSV WITH HEADER ROW \
LOCATION '/mnt/ssd/uk_cities.csv'",
);
let ast = parse_sql(&sql);
match ast {
ASTNode::SQLCreateTable {
name,
columns,
file_type,
header_row,
location,
} => {
assert_eq!("uk_cities", name);
assert_eq!(3, columns.len());
assert_eq!(FileType::CSV, file_type);
assert_eq!(true, header_row);
assert_eq!("/mnt/ssd/uk_cities.csv", location);
let c_name = &columns[0];
assert_eq!("name", c_name.name);
assert_eq!(SQLType::Utf8(100), c_name.data_type);
assert_eq!(false, c_name.allow_null);
let c_lat = &columns[1];
assert_eq!("lat", c_lat.name);
assert_eq!(SQLType::Double64, c_lat.data_type);
assert_eq!(true, c_lat.allow_null);
let c_lng = &columns[2];
assert_eq!("lng", c_lng.name);
assert_eq!(SQLType::Double64, c_lng.data_type);
assert_eq!(true, c_lng.allow_null);
}
_ => assert!(false),
}
}
#[test]
fn parse_create_external_table_csv_without_header_row() {
let sql = String::from(
"CREATE EXTERNAL TABLE uk_cities (\
name VARCHAR(100) NOT NULL,\
lat DOUBLE NOT NULL,\
lng DOUBLE NOT NULL) \
STORED AS CSV WITHOUT HEADER ROW \
LOCATION '/mnt/ssd/uk_cities.csv'",
);
let ast = parse_sql(&sql);
match ast {
ASTNode::SQLCreateTable {
name,
columns,
file_type,
header_row,
location,
} => {
assert_eq!("uk_cities", name);
assert_eq!(3, columns.len());
assert_eq!(FileType::CSV, file_type);
assert_eq!(false, header_row);
assert_eq!("/mnt/ssd/uk_cities.csv", location);
}
_ => assert!(false),
}
}
#[test]
fn parse_create_external_table_parquet() {
let sql = String::from(
"CREATE EXTERNAL TABLE uk_cities \
STORED AS PARQUET \
LOCATION '/mnt/ssd/uk_cities.parquet'",
);
let ast = parse_sql(&sql);
match ast {
ASTNode::SQLCreateTable {
name,
columns,
file_type,
location,
..
} => {
assert_eq!("uk_cities", name);
assert_eq!(0, columns.len());
assert_eq!(FileType::Parquet, file_type);
assert_eq!("/mnt/ssd/uk_cities.parquet", location);
}
_ => assert!(false),
}
}
#[test]
fn parse_scalar_function_in_projection() {
let sql = String::from("SELECT sqrt(id) FROM foo");
let ast = parse_sql(&sql);
if let ASTNode::SQLSelect { projection, .. } = ast {
assert_eq!(
vec![ASTNode::SQLFunction {
id: String::from("sqrt"),
args: vec![ASTNode::SQLIdentifier(String::from("id"))],
}],
projection
);
} else {
assert!(false);
}
}
#[test]
fn parse_aggregate_with_group_by() {
let sql = String::from("SELECT a, COUNT(1), MIN(b), MAX(b) FROM foo GROUP BY a");
let _ast = parse_sql(&sql);
//TODO: assertions
}
#[test]
fn parse_select_version() {
let sql = "SELECT @@version";
match parse_sql(&sql) {
ASTNode::SQLSelect { ref projection, .. } => {
assert_eq!(
projection[0],
ASTNode::SQLIdentifier("@@version".to_string())
);
}
_ => panic!(),
}
}
fn parse_sql(sql: &str) -> ASTNode {
let mut tokenizer = Tokenizer::new(&sql);
let tokens = tokenizer.tokenize().unwrap();
let mut parser = Parser::new(tokens);
let ast = parser.parse().unwrap();
ast
}
}

427
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@ -0,0 +1,427 @@
// Copyright 2018 Grove Enterprises LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//! SQL Tokenizer
use std::iter::Peekable;
use std::str::Chars;
use fnv::FnvHashSet;
/// SQL Token enumeration
#[derive(Debug, Clone, PartialEq)]
pub enum Token {
/// SQL identifier e.g. table or column name
Identifier(String),
/// SQL keyword e.g. Keyword("SELECT")
Keyword(String),
/// Numeric literal
Number(String),
/// String literal
String(String),
/// Comma
Comma,
/// Whitespace (space, tab, etc)
Whitespace,
/// Equality operator `=`
Eq,
/// Not Equals operator `!=` or `<>`
Neq,
/// Less Than operator `<`
Lt,
/// Greater han operator `>`
Gt,
/// Less Than Or Equals operator `<=`
LtEq,
/// Greater Than Or Equals operator `>=`
GtEq,
/// Plus operator `+`
Plus,
/// Minus operator `-`
Minus,
/// Multiplication operator `*`
Mult,
/// Division operator `/`
Div,
/// Modulo Operator `%`
Mod,
/// Left parenthesis `(`
LParen,
/// Right parenthesis `)`
RParen,
/// Period (used for compound identifiers or projections into nested types)
Period,
}
/// Tokenizer error
#[derive(Debug)]
pub struct TokenizerError(String);
lazy_static! {
static ref KEYWORDS: FnvHashSet<&'static str> = {
let mut m = FnvHashSet::default();
m.insert("SELECT");
m.insert("FROM");
m.insert("WHERE");
m.insert("LIMIT");
m.insert("ORDER");
m.insert("GROUP");
m.insert("BY");
m.insert("HAVING");
m.insert("UNION");
m.insert("ALL");
m.insert("INSERT");
m.insert("UPDATE");
m.insert("DELETE");
m.insert("IN");
m.insert("IS");
m.insert("NULL");
m.insert("SET");
m.insert("CREATE");
m.insert("EXTERNAL");
m.insert("TABLE");
m.insert("ASC");
m.insert("DESC");
m.insert("AND");
m.insert("OR");
m.insert("NOT");
m.insert("AS");
m.insert("STORED");
m.insert("CSV");
m.insert("PARQUET");
m.insert("LOCATION");
m.insert("WITH");
m.insert("WITHOUT");
m.insert("HEADER");
m.insert("ROW");
// SQL types
m.insert("STRING");
m.insert("VARCHAR");
m.insert("FLOAT");
m.insert("DOUBLE");
m.insert("INT");
m.insert("INTEGER");
m.insert("LONG");
// Arrow native types
m.insert("BOOLEAN");
m.insert("UINT8");
m.insert("UINT16");
m.insert("UINT32");
m.insert("UINT64");
m.insert("INT8");
m.insert("INT16");
m.insert("INT32");
m.insert("INT64");
m.insert("FLOAT32");
m.insert("FLOAT64");
m.insert("UTF8");
m
};
}
/// SQL Tokenizer
pub struct Tokenizer {
pub query: String,
}
impl Tokenizer {
/// Create a new SQL tokenizer for the specified SQL statement
pub fn new(query: &str) -> Self {
Self {
query: query.to_string(),
}
}
/// Tokenize the statement and produce a vector of tokens
pub fn tokenize(&mut self) -> Result<Vec<Token>, TokenizerError> {
let mut peekable = self.query.chars().peekable();
let mut tokens: Vec<Token> = vec![];
while let Some(token) = self.next_token(&mut peekable)? {
tokens.push(token);
}
Ok(tokens
.into_iter()
.filter(|t| match t {
Token::Whitespace => false,
_ => true,
})
.collect())
}
/// Get the next token or return None
fn next_token(&self, chars: &mut Peekable<Chars>) -> Result<Option<Token>, TokenizerError> {
//println!("next_token: {:?}", chars.peek());
match chars.peek() {
Some(&ch) => match ch {
// whitespace
' ' | '\t' | '\n' => {
chars.next(); // consume
Ok(Some(Token::Whitespace))
}
// identifier or keyword
'a'...'z' | 'A'...'Z' | '_' | '@' => {
let mut s = String::new();
while let Some(&ch) = chars.peek() {
match ch {
'a'...'z' | 'A'...'Z' | '_' | '0'...'9' | '@' => {
chars.next(); // consume
s.push(ch);
}
_ => break,
}
}
let upper_str = s.to_uppercase();
if KEYWORDS.contains(upper_str.as_str()) {
Ok(Some(Token::Keyword(upper_str)))
} else {
Ok(Some(Token::Identifier(s)))
}
}
// string
'\'' => {
//TODO: handle escaped quotes in string
//TODO: handle EOF before terminating quote
let mut s = String::new();
chars.next(); // consume
while let Some(&ch) = chars.peek() {
match ch {
'\'' => {
chars.next(); // consume
break;
}
_ => {
chars.next(); // consume
s.push(ch);
}
}
}
Ok(Some(Token::String(s)))
}
// numbers
'0'...'9' => {
let mut s = String::new();
while let Some(&ch) = chars.peek() {
match ch {
'0'...'9' | '.' => {
chars.next(); // consume
s.push(ch);
}
_ => break,
}
}
Ok(Some(Token::Number(s)))
}
// punctuation
',' => {
chars.next();
Ok(Some(Token::Comma))
}
'(' => {
chars.next();
Ok(Some(Token::LParen))
}
')' => {
chars.next();
Ok(Some(Token::RParen))
}
// operators
'+' => {
chars.next();
Ok(Some(Token::Plus))
}
'-' => {
chars.next();
Ok(Some(Token::Minus))
}
'*' => {
chars.next();
Ok(Some(Token::Mult))
}
'/' => {
chars.next();
Ok(Some(Token::Div))
}
'%' => {
chars.next();
Ok(Some(Token::Mod))
}
'=' => {
chars.next();
Ok(Some(Token::Eq))
}
'.' => {
chars.next();
Ok(Some(Token::Period))
}
'!' => {
chars.next(); // consume
match chars.peek() {
Some(&ch) => match ch {
'=' => {
chars.next();
Ok(Some(Token::Neq))
}
_ => Err(TokenizerError(format!("TBD"))),
},
None => Err(TokenizerError(format!("TBD"))),
}
}
'<' => {
chars.next(); // consume
match chars.peek() {
Some(&ch) => match ch {
'=' => {
chars.next();
Ok(Some(Token::LtEq))
}
'>' => {
chars.next();
Ok(Some(Token::Neq))
}
_ => Ok(Some(Token::Lt)),
},
None => Ok(Some(Token::Lt)),
}
}
'>' => {
chars.next(); // consume
match chars.peek() {
Some(&ch) => match ch {
'=' => {
chars.next();
Ok(Some(Token::GtEq))
}
_ => Ok(Some(Token::Gt)),
},
None => Ok(Some(Token::Gt)),
}
}
_ => Err(TokenizerError(format!(
"unhandled char '{}' in tokenizer",
ch
))),
},
None => Ok(None),
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn tokenize_select_1() {
let sql = String::from("SELECT 1");
let mut tokenizer = Tokenizer::new(&sql);
let tokens = tokenizer.tokenize().unwrap();
let expected = vec![
Token::Keyword(String::from("SELECT")),
Token::Number(String::from("1")),
];
compare(expected, tokens);
}
#[test]
fn tokenize_scalar_function() {
let sql = String::from("SELECT sqrt(1)");
let mut tokenizer = Tokenizer::new(&sql);
let tokens = tokenizer.tokenize().unwrap();
let expected = vec![
Token::Keyword(String::from("SELECT")),
Token::Identifier(String::from("sqrt")),
Token::LParen,
Token::Number(String::from("1")),
Token::RParen,
];
compare(expected, tokens);
}
#[test]
fn tokenize_simple_select() {
let sql = String::from("SELECT * FROM customer WHERE id = 1 LIMIT 5");
let mut tokenizer = Tokenizer::new(&sql);
let tokens = tokenizer.tokenize().unwrap();
let expected = vec![
Token::Keyword(String::from("SELECT")),
Token::Mult,
Token::Keyword(String::from("FROM")),
Token::Identifier(String::from("customer")),
Token::Keyword(String::from("WHERE")),
Token::Identifier(String::from("id")),
Token::Eq,
Token::Number(String::from("1")),
Token::Keyword(String::from("LIMIT")),
Token::Number(String::from("5")),
];
compare(expected, tokens);
}
#[test]
fn tokenize_string_predicate() {
let sql = String::from("SELECT * FROM customer WHERE salary != 'Not Provided'");
let mut tokenizer = Tokenizer::new(&sql);
let tokens = tokenizer.tokenize().unwrap();
let expected = vec![
Token::Keyword(String::from("SELECT")),
Token::Mult,
Token::Keyword(String::from("FROM")),
Token::Identifier(String::from("customer")),
Token::Keyword(String::from("WHERE")),
Token::Identifier(String::from("salary")),
Token::Neq,
Token::String(String::from("Not Provided")),
];
compare(expected, tokens);
}
#[test]
fn tokenize_is_null() {
let sql = String::from("a IS NULL");
let mut tokenizer = Tokenizer::new(&sql);
let tokens = tokenizer.tokenize().unwrap();
let expected = vec![
Token::Identifier(String::from("a")),
Token::Keyword("IS".to_string()),
Token::Keyword("NULL".to_string()),
];
compare(expected, tokens);
}
fn compare(expected: Vec<Token>, actual: Vec<Token>) {
//println!("------------------------------");
//println!("tokens = {:?}", actual);
//println!("expected = {:?}", expected);
//println!("------------------------------");
assert_eq!(expected, actual);
}
}

124
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@ -1,124 +0,0 @@
use std::cmp::PartialEq;
use std::fmt::Debug;
/// Simple holder for a sequence of characters that supports iteration and mark/reset methods
pub struct CharSeq {
chars: Vec<char>,
i: usize,
m: usize
}
impl CharSeq {
/// Create a CharSeq from a string
pub fn new(sql: &str) -> Self {
CharSeq {
chars: sql.chars().collect(),
i: 0,
m: 0
}
}
/// Mark the current index
pub fn mark(&mut self) {
self.m = self.i;
}
/// Reset the index
pub fn reset(&mut self) {
self.i = self.m;
}
/// Peek the next char
pub fn peek(&mut self) -> Option<&char> {
if self.i < self.chars.len() {
Some(&self.chars[self.i])
} else {
None
}
}
/// Get the next char
pub fn next(&mut self) -> Option<char> {
if self.i < self.chars.len() {
self.i += 1;
Some(self.chars[self.i-1])
} else {
None
}
}
}
#[derive(Debug)]
pub struct Position {
line: usize,
col: usize
}
impl Position {
pub fn new(line: usize, col: usize) -> Self {
Position { line, col }
}
}
#[derive(Debug)]
pub enum TokenizerError {
UnexpectedChar(char,Position),
UnexpectedEof(Position),
UnterminatedStringLiteral(Position),
Custom(String)
}
/// SQL Tokens
#[derive(Debug,PartialEq)]
pub enum SQLToken {
Whitespace(char),
Keyword(String),
Identifier(String),
Literal(String), //TODO: need to model different types of literal
Plus,
Minus,
Mult,
Divide,
Eq,
Not,
NotEq,
Gt,
GtEq,
Lt,
LtEq,
LParen,
RParen,
Comma,
}
pub trait SQLTokenizer {
/// get the precendence of a token
fn precedence(&self, token: &SQLToken) -> usize;
fn peek_token(&mut self) -> Result<Option<SQLToken>, TokenizerError>;
/// return a reference to the next token and advance the index
fn next_token(&mut self) -> Result<Option<SQLToken>, TokenizerError>;
}
pub fn tokenize(sql: &str, tokenizer: &mut SQLTokenizer) -> Result<Vec<SQLToken>, TokenizerError> {
let mut chars = CharSeq::new(sql);
let mut tokens : Vec<SQLToken> = vec![];
loop {
match tokenizer.next_token()? {
Some(SQLToken::Whitespace(_)) => { /* ignore */ },
Some(token) => {
println!("Token: {:?}", token);
tokens.push(token)
},
None => break
}
}
Ok(tokens)
}