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//! Inquerest can parse complex url query into a SQL abstract syntax tree.
//!
//! Example this url:
//! ```no_run,ignore
//! /person?age=lt.42&(student=eq.true|gender=eq.'M')&group_by=sum(age),grade,gender&having=min(age)=gt.42&order_by=age.desc,height.asc&page=20&page_size=100
//! ```
//! will be parsed into:
//!
//! ```rust,ignore
//! Select {
//! from_table: FromTable {
//! from: Table {
//! name: "person",
//! },
//! join: None,
//! },
//! filter: Some(
//! BinaryOperation(
//! BinaryOperation {
//! left: BinaryOperation(
//! BinaryOperation {
//! left: Column(
//! Column {
//! name: "age",
//! },
//! ),
//! operator: Lt,
//! right: Value(
//! Number(
//! 42.0,
//! ),
//! ),
//! },
//! ),
//! operator: And,
//! right: Nested(
//! BinaryOperation(
//! BinaryOperation {
//! left: BinaryOperation(
//! BinaryOperation {
//! left: Column(
//! Column {
//! name: "student",
//! },
//! ),
//! operator: Eq,
//! right: Value(
//! Bool(
//! true,
//! ),
//! ),
//! },
//! ),
//! operator: Or,
//! right: BinaryOperation(
//! BinaryOperation {
//! left: Column(
//! Column {
//! name: "gender",
//! },
//! ),
//! operator: Eq,
//! right: Value(
//! String(
//! "M",
//! ),
//! ),
//! },
//! ),
//! },
//! ),
//! ),
//! },
//! ),
//! ),
//! group_by: Some(
//! [
//! Function(
//! Function {
//! name: "sum",
//! params: [
//! Column(
//! Column {
//! name: "age",
//! },
//! ),
//! ],
//! },
//! ),
//! Column(
//! Column {
//! name: "grade",
//! },
//! ),
//! Column(
//! Column {
//! name: "gender",
//! },
//! ),
//! ],
//! ),
//! having: Some(
//! BinaryOperation(
//! BinaryOperation {
//! left: Function(
//! Function {
//! name: "min",
//! params: [
//! Column(
//! Column {
//! name: "age",
//! },
//! ),
//! ],
//! },
//! ),
//! operator: Gt,
//! right: Value(
//! Number(
//! 42.0,
//! ),
//! ),
//! },
//! ),
//! ),
//! projection: None,
//! order_by: Some(
//! [
//! Order {
//! expr: Column(
//! Column {
//! name: "age",
//! },
//! ),
//! direction: Some(
//! Desc,
//! ),
//! },
//! Order {
//! expr: Column(
//! Column {
//! name: "height",
//! },
//! ),
//! direction: Some(
//! Asc,
//! ),
//! },
//! ],
//! ),
//! range: Some(
//! Page(
//! Page {
//! page: 20,
//! page_size: 100,
//! },
//! ),
//! ),
//! }
//! ```
//! Which translate to the sql statement:
//! ```sql
//! SELECT * FROM person WHERE age < 42 AND (student = true OR gender = 'M') GROUP BY sum(age), grade, gender HAVING min(age) > 42 ORDER BY age DESC, height ASC LIMIT 100 OFFSET 1900 ROWS
//! ```
//! Note: However, you don't want to convert to the sql statement directly to avoid sql injection
//! attack. You need to validate the tables and columns if it is allowed to be accessed by the
//! user. You also need to extract the values yourself and supply it as a parameterized value into
//! your ORM.
//!
//! #### Please support this project:
//! [](https://www.patreon.com/ivanceras)
pub use restq;
pub use ;
/// Parse a path and query in a url to a Select AST
/// Example:
/// ```rust
/// use inquerest::*;
///
/// let url = "/person?age=lt.42&(student=eq.true|gender=eq.'M')&group_by=sum(age),grade,gender&having=min(age)=gt.42&order_by=age.desc,height.asc&page=20&page_size=100";
/// let query = inquerest::parse_query(url);
/// println!("query: {:#?}", query);
/// println!(
/// "sql query: {}",
/// query.unwrap().into_sql_statement(None).unwrap().to_string()
/// );
/// ```
/// Parse the query in a url to an Expression
///
/// Example:
/// ```rust
/// use inquerest::*;
///
/// let filter = "age=lt.42&(student=eq.true|gender=eq.'M')&group_by=sum(age),grade,gender&having=min(age)=gt.42&order_by=age.desc,height.asc&page=20&page_size=100";
/// let result = parse_filter(filter);
/// println!("filter_only: {:#?}", result);
/// ```