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use crate::ast::{
ColumnName,
Function,
Operator,
Value,
};
use sql_ast::ast as sql;
use std::fmt;
#[derive(Debug, PartialEq, Clone)]
pub enum Expr {
Column(ColumnName),
Function(Function),
Value(Value),
BinaryOperation(Box<BinaryOperation>),
Nested(Box<Expr>),
}
#[derive(Debug, PartialEq, Clone)]
pub struct ExprRename {
pub expr: Expr,
pub rename: Option<String>,
}
#[derive(Debug, PartialEq, Clone)]
pub struct BinaryOperation {
pub left: Expr,
pub operator: Operator,
pub right: Expr,
}
impl Into<sql::Expr> for &Expr {
fn into(self) -> sql::Expr {
match self {
Expr::Column(column) => {
sql::Expr::Identifier(sql::Ident::new(&column.name))
}
Expr::Function(function) => {
sql::Expr::Function(Into::into(function))
}
Expr::Value(value) => sql::Expr::Value(Into::into(value)),
Expr::BinaryOperation(binop) => {
sql::Expr::BinaryOp {
left: Box::new(Into::into(&binop.left)),
op: Into::into(&binop.operator),
right: Box::new(Into::into(&binop.right)),
}
}
Expr::Nested(expr) => {
sql::Expr::Nested(Box::new(Into::into(expr.as_ref())))
}
}
}
}
impl fmt::Display for Expr {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
Expr::Column(column) => column.fmt(f),
Expr::Function(function) => function.fmt(f),
Expr::Value(value) => value.fmt(f),
Expr::BinaryOperation(bop) => bop.fmt(f),
Expr::Nested(expr) => write!(f, "({})", expr),
}
}
}
impl fmt::Display for BinaryOperation {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
if self.operator.needs_separator() {
write!(f, "{}={}.{}", self.left, self.operator, self.right)
} else {
write!(f, "{}{}{}", self.left, self.operator, self.right)
}
}
}
impl fmt::Display for ExprRename {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
self.expr.fmt(f)?;
if let Some(rename) = &self.rename {
write!(f, "=>{}", rename)?;
}
Ok(())
}
}