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use crate::error::Error;
use proc_macro2::{Ident, Span};
use quote::quote;
use quote::ToTokens;
use syn::{BinOp, Expr, Lit, Member};
///translate like `#{a + b}` Expr to rust code Expr
#[allow(clippy::only_used_in_recursion)]
pub fn translate(context: &str, arg: Expr, ignore: &[String]) -> Result<Expr, Error> {
match arg {
Expr::Path(b) => {
let token = b.to_token_stream().to_string();
if token == "null" {
return syn::parse_str::<Expr>("rbs::Value::Null").map_err(Error::from);
}
if token == "sql" {
return Ok(Expr::Path(b));
}
let param = b.to_token_stream().to_string().trim().to_string();
let mut fetch_from_arg = true;
for x in ignore {
if param.eq(x) {
fetch_from_arg = false;
}
}
if fetch_from_arg {
syn::parse_str::<Expr>(&format!("&arg[\"{}\"]", param)).map_err(Error::from)
} else {
syn::parse_str::<Expr>(¶m.to_string()).map_err(Error::from)
}
}
Expr::MethodCall(mut b) => {
//receiver is named need to convert to arg["xxx"]
b.receiver = Box::new(translate(context, *b.receiver, ignore)?);
Ok(Expr::MethodCall(b))
}
Expr::Binary(mut b) => {
b.left = Box::new(translate(context, *b.left, ignore)?);
b.right = Box::new(translate(context, *b.right, ignore)?);
match b.op {
BinOp::Add(_) => {
let left_token = b.left.to_token_stream().to_string();
if left_token.trim().ends_with("\"") && left_token.trim().starts_with("\"") {
return syn::parse_str::<Expr>(&format!(
"(String::from({})).op_add({})",
b.left.to_token_stream(),
b.right.to_token_stream()
))
.map_err(Error::from);
} else {
return syn::parse_str::<Expr>(&format!(
"({}).op_add(&{})",
b.left.to_token_stream(),
b.right.to_token_stream()
))
.map_err(Error::from);
}
}
BinOp::And(_) => {
b.left = Box::new(
syn::parse_str::<Expr>(&format!(
"bool::op_from({})",
b.left.to_token_stream().to_string().trim()
))
.expect("codegen_func fail"),
);
b.right = Box::new(
syn::parse_str::<Expr>(&format!(
"bool::op_from({})",
b.right.to_token_stream().to_string().trim()
))
.expect("codegen_func fail"),
);
}
BinOp::Or(_) => {
b.left = Box::new(
syn::parse_str::<Expr>(&format!(
"bool::op_from({})",
b.left.to_token_stream().to_string().trim()
))
.expect("codegen_func fail"),
);
b.right = Box::new(
syn::parse_str::<Expr>(&format!(
"bool::op_from({})",
b.right.to_token_stream().to_string().trim()
))
.expect("codegen_func fail"),
);
}
// The `-` operator (subtraction)
BinOp::Sub(_) => {
return syn::parse_str::<Expr>(&format!(
"({}).op_sub(&{})",
b.left.to_token_stream(),
b.right.to_token_stream()
))
.map_err(Error::from);
}
// The `*` operator (multiplication)
BinOp::Mul(_) => {
return syn::parse_str::<Expr>(&format!(
"({}).op_mul(&{})",
b.left.to_token_stream(),
b.right.to_token_stream()
))
.map_err(Error::from);
}
// The `/` operator (division)
BinOp::Div(_) => {
return syn::parse_str::<Expr>(&format!(
"({}).op_div(&{})",
b.left.to_token_stream(),
b.right.to_token_stream()
))
.map_err(Error::from);
}
// The `%` operator (modulus)
BinOp::Rem(_) => {
return syn::parse_str::<Expr>(&format!(
"({}).op_rem(&{})",
b.left.to_token_stream(),
b.right.to_token_stream()
))
.map_err(Error::from);
}
// The `&` operator (bitwise and)
BinOp::BitAnd(_) => {
return syn::parse_str::<Expr>(&format!(
"({}).op_bitand(&{})",
b.left.to_token_stream(),
b.right.to_token_stream()
))
.map_err(Error::from);
}
// The `|` operator (bitwise or)
BinOp::BitOr(_) => {
return syn::parse_str::<Expr>(&format!(
"({}).op_bitor(&{})",
b.left.to_token_stream(),
b.right.to_token_stream()
))
.map_err(Error::from);
}
// The `==` operator (equality)
BinOp::Eq(_) => {
return syn::parse_str::<Expr>(&format!(
"({}).op_eq(&{})",
b.left.to_token_stream(),
b.right.to_token_stream()
))
.map_err(Error::from);
}
// The `<` operator (less than)
BinOp::Lt(_) => {
return syn::parse_str::<Expr>(&format!(
"({}).op_lt(&{})",
b.left.to_token_stream(),
b.right.to_token_stream()
))
.map_err(Error::from);
}
// The `<=` operator (less than or equal to)
BinOp::Le(_) => {
return syn::parse_str::<Expr>(&format!(
"({}).op_le(&{})",
b.left.to_token_stream(),
b.right.to_token_stream()
))
.map_err(Error::from);
}
// The `!=` operator (not equal to)
BinOp::Ne(_) => {
return syn::parse_str::<Expr>(&format!(
"({}).op_ne(&{})",
b.left.to_token_stream(),
b.right.to_token_stream()
))
.map_err(Error::from);
}
// The `>=` operator (greater than or equal to)
BinOp::Ge(_) => {
return syn::parse_str::<Expr>(&format!(
"({}).op_ge(&{})",
b.left.to_token_stream(),
b.right.to_token_stream()
))
.map_err(Error::from);
}
// The `>` operator (greater than)
BinOp::Gt(_) => {
return syn::parse_str::<Expr>(&format!(
"({}).op_gt(&{})",
b.left.to_token_stream(),
b.right.to_token_stream()
))
.map_err(Error::from);
}
// The `^` operator (bitwise xor)
BinOp::BitXor(_) => {
return syn::parse_str::<Expr>(&format!(
"({}).op_bitxor(&{})",
b.left.to_token_stream(),
b.right.to_token_stream()
))
.map_err(Error::from);
}
// The `<<` operator (shift left)
BinOp::Shl(_) => {
return syn::parse_str::<Expr>(&format!(
"({}).op_shl(&{})",
b.left.to_token_stream(),
b.right.to_token_stream()
))
.map_err(Error::from);
}
// The `>>` operator (shift right)
BinOp::Shr(_) => {
return syn::parse_str::<Expr>(&format!(
"({}).op_shr(&{})",
b.left.to_token_stream(),
b.right.to_token_stream()
))
.map_err(Error::from);
}
// Unknown operator
_ => {
return Err(Error::from(format!(
"unsupported token {}",
b.op.to_token_stream()
)))
}
}
Ok(Expr::Binary(b))
}
Expr::Unary(mut b) => {
b.expr = Box::new(translate(context, *b.expr, ignore)?);
if b.op.to_token_stream().to_string().trim() == "-" {
return syn::parse_str::<Expr>(&format!(
"0i64.op_sub({})",
b.expr.to_token_stream().to_string().trim()
))
.map_err(Error::from);
}
if b.op.to_token_stream().to_string().trim() == "!" {
b.expr = Box::new(
syn::parse_str::<Expr>(&format!(
"bool::from({})",
b.expr.to_token_stream().to_string().trim()
))
.map_err(Error::from)?,
);
}
Ok(Expr::Unary(b))
}
//(a-b)
Expr::Paren(mut b) => {
b.expr = Box::new(translate(context, *b.expr, ignore)?);
Ok(Expr::Paren(b))
}
//a.b
Expr::Field(mut b) => {
b.base = Box::new(translate(context, *b.base, ignore)?);
match b.member {
Member::Named(named) => {
return syn::parse_str::<Expr>(&format!(
"(&{}[\"{}\"])",
b.base.to_token_stream(),
named.to_token_stream()
))
.map_err(Error::from);
}
Member::Unnamed(_) => {}
}
Ok(Expr::Field(b))
}
Expr::Reference(mut b) => {
b.expr = Box::new(translate(context, *b.expr, ignore)?);
let result = Expr::Reference(b);
Ok(result)
}
Expr::Index(mut b) => {
*b.expr = translate(context, *b.expr, ignore)?;
syn::parse_str::<Expr>(&format!(
"&{}[{}]",
b.expr.to_token_stream(),
b.index.to_token_stream()
))
.map_err(Error::from)
}
Expr::Let(_let_expr) => Err(Error::from("unsupported token `let`")),
Expr::Lit(b) => {
match b.lit {
Lit::Str(_) => {}
Lit::ByteStr(_) => {}
Lit::Byte(_) => {}
Lit::Char(_) => {}
Lit::Int(i) => {
//cast int to i64
return syn::parse_str::<Expr>(&format!("{}i64", i))
.map_err(Error::from);
}
Lit::Float(f) => {
//cast int to f64
return syn::parse_str::<Expr>(&format!("{}f64", f))
.map_err(Error::from);
}
Lit::Bool(_) => {}
Lit::Verbatim(_) => {}
_ => {}
}
Ok(Expr::Lit(b))
}
_ => Ok(arg),
}
}
/// gen method or body(if func_name_ident is empty)
pub fn impl_fn(
context: &str,
func_name_ident: &str,
args: &str,
serialize_result: bool,
ignore: &[String],
) -> proc_macro2::TokenStream {
let mut string_data = args.to_string();
string_data = string_data[1..string_data.len() - 1].to_string();
//convert string define
let mut last_char = '_';
let mut string_data_new = String::new();
for x in string_data.chars() {
if x == '\'' && last_char != '\\' {
string_data_new.push('\"');
} else {
string_data_new.push(x);
}
last_char = x;
}
string_data = string_data_new;
let mut t = syn::parse_str::<Expr>(&string_data).unwrap_or_else(|e| {
panic!(
"[rbatis-codegen]syn::parse_str: {} fail: {}",
args, e
)
});
t = translate(context, t, ignore).expect("translate fail");
string_data = t.to_token_stream().to_string();
let t = syn::parse_str::<Expr>(&string_data).unwrap_or_else(|e| {
panic!(
"[rbatis-codegen]syn::parse_str: {} fail: {}",
args, e
)
});
let mut result_impl = quote! { {#t} };
if serialize_result {
result_impl = quote! {rbs::value({#t}).unwrap_or_default()};
}
if func_name_ident.is_empty() || func_name_ident.eq("\"\"") {
quote! {#result_impl}
} else {
let func_name_ident = Ident::new(func_name_ident, Span::call_site());
quote! {
pub fn #func_name_ident(arg:&rbs::Value) -> rbs::Value {
use rbatis_codegen::ops::*;
#result_impl
}
}
}
}