use erg_common::color::{GREEN, RED, RESET};
use erg_common::error::Location;
use erg_common::get_hash;
use erg_common::traits::{HasType, Locational, Stream};
use erg_common::ty::{ParamTy, TyParam, Type};
use erg_common::value::{ValueObj, Visibility};
use erg_common::{fn_name, log, switch_lang};
use erg_parser::ast;
use erg_parser::ast::AST;
use crate::context::{Context, ContextKind, RegistrationMode};
use crate::error::{LowerError, LowerErrors, LowerResult, LowerWarnings};
use crate::hir;
use crate::hir::HIR;
use Visibility::*;
#[derive(Debug)]
pub struct ASTLowerer {
pub(crate) ctx: Context,
errs: LowerErrors,
warns: LowerWarnings,
}
impl ASTLowerer {
pub fn new() -> Self {
Self {
ctx: Context::new_root_module(),
errs: LowerErrors::empty(),
warns: LowerWarnings::empty(),
}
}
fn return_t_check(
&self,
loc: Location,
name: &str,
expect: &Type,
found: &Type,
) -> LowerResult<()> {
self.ctx.unify(expect, found, Some(loc), None).map_err(|_| {
LowerError::type_mismatch_error(
line!() as usize,
loc,
self.ctx.caused_by(),
name,
expect,
found,
)
})
}
fn use_check(&self, expr: hir::Expr, mode: &str) -> LowerResult<hir::Expr> {
if mode != "eval" && !expr.ref_t().is_nonelike() {
Err(LowerError::syntax_error(
0,
expr.loc(),
self.ctx.name.clone(),
switch_lang!(
"japanese" => "式の評価結果が使われていません",
"simplified_chinese" => "表达式评估结果未使用",
"traditional_chinese" => "表達式評估結果未使用",
"english" => "the evaluation result of the expression is not used",
),
Some(
switch_lang!(
"japanese" => "値を使わない場合は、discard関数を使用してください",
"simplified_chinese" => "如果您不想使用该值,请使用discard函数",
"traditional_chinese" => "如果您不想使用該值,請使用discard函數",
"english" => "if you don't use the value, use discard function",
)
.into(),
),
))
} else {
Ok(expr)
}
}
fn pop_append_errs(&mut self) {
if let Err(mut errs) = self.ctx.pop() {
self.errs.append(&mut errs);
}
}
fn lower_array(&mut self, array: ast::Array, check: bool) -> LowerResult<hir::Array> {
log!("[DEBUG] entered {}({array})", fn_name!());
match array {
ast::Array::Normal(arr) => Ok(hir::Array::Normal(self.lower_normal_array(arr, check)?)),
ast::Array::WithLength(arr) => Ok(hir::Array::WithLength(
self.lower_array_with_length(arr, check)?,
)),
other => todo!("{other}"),
}
}
fn lower_normal_array(
&mut self,
array: ast::NormalArray,
check: bool,
) -> LowerResult<hir::NormalArray> {
log!("[DEBUG] entered {}({array})", fn_name!());
let mut hir_array = hir::NormalArray::new(
array.l_sqbr,
array.r_sqbr,
self.ctx.level,
hir::Args::empty(),
);
let inner_t = hir_array.t.ref_t().inner_ts().first().unwrap().clone();
let (elems, _) = array.elems.into_iters();
for elem in elems {
let elem = self.lower_expr(elem.expr, check)?;
self.ctx
.sub_unify(elem.ref_t(), &inner_t, Some(elem.loc()), None)?;
hir_array.push(elem);
}
Ok(hir_array)
}
fn lower_array_with_length(
&mut self,
array: ast::ArrayWithLength,
check: bool,
) -> LowerResult<hir::ArrayWithLength> {
log!("[DEBUG] entered {}({array})", fn_name!());
let elem = self.lower_expr(array.elem.expr, check)?;
let array_t = self.gen_array_with_length_type(&elem, &array.len);
let len = self.lower_expr(*array.len, check)?;
let hir_array = hir::ArrayWithLength::new(array.l_sqbr, array.r_sqbr, array_t, elem, len);
Ok(hir_array)
}
fn gen_array_with_length_type(&self, elem: &hir::Expr, len: &ast::Expr) -> Type {
let maybe_len = self.ctx.eval.eval_const_expr(len, &self.ctx);
match maybe_len {
Some(v @ ValueObj::Nat(_)) => {
if elem.ref_t().is_mut() {
Type::poly(
"ArrayWithMutType!",
vec![TyParam::t(elem.t()), TyParam::Value(v)],
)
} else {
Type::array(elem.t(), TyParam::Value(v))
}
}
Some(v @ ValueObj::Mut(_)) if v.class() == Type::mono("Nat!") => {
if elem.ref_t().is_mut() {
Type::poly(
"ArrayWithMutTypeAndLength!",
vec![TyParam::t(elem.t()), TyParam::Value(v)],
)
} else {
Type::array_mut(elem.t(), TyParam::Value(v))
}
}
Some(other) => todo!("{other} is not a Nat object"),
None => {
if elem.ref_t().is_mut() {
Type::poly(
"ArrayWithMutType!",
vec![TyParam::t(elem.t()), TyParam::erased(Type::Nat)],
)
} else {
Type::array(elem.t(), TyParam::erased(Type::Nat))
}
}
}
}
fn lower_acc(&mut self, acc: ast::Accessor, check: bool) -> LowerResult<hir::Accessor> {
log!("[DEBUG] entered {}({acc})", fn_name!());
match acc {
ast::Accessor::Local(n) => {
let (t, __name__) = if check {
(
self.ctx.get_var_t(&n.symbol, Private, &self.ctx.name)?,
self.ctx.get_local_uniq_obj_name(&n.symbol),
)
} else {
(Type::ASTOmitted, None)
};
let acc = hir::Accessor::Local(hir::Local::new(n.symbol, __name__, t));
Ok(acc)
}
ast::Accessor::Public(n) => {
let (t, __name__) = if check {
(
self.ctx.get_var_t(&n.symbol, Public, &self.ctx.name)?,
self.ctx.get_local_uniq_obj_name(&n.symbol),
)
} else {
(Type::ASTOmitted, None)
};
let public = hir::Public::new(n.dot, n.symbol, __name__, t);
let acc = hir::Accessor::Public(public);
Ok(acc)
}
ast::Accessor::Attr(a) => {
let obj = self.lower_expr(*a.obj, true)?;
let t = if check {
self.ctx.get_attr_t(&obj, &a.name.symbol, &self.ctx.name)?
} else {
Type::ASTOmitted
};
let acc = hir::Accessor::Attr(hir::Attribute::new(obj, a.name.symbol, t));
Ok(acc)
}
_ => todo!(),
}
}
fn lower_bin(&mut self, bin: ast::BinOp) -> LowerResult<hir::BinOp> {
log!("[DEBUG] entered {}({bin})", fn_name!());
let mut args = bin.args.into_iter();
let lhs = hir::PosArg::new(self.lower_expr(*args.next().unwrap(), true)?);
let rhs = hir::PosArg::new(self.lower_expr(*args.next().unwrap(), true)?);
let args = [lhs, rhs];
let t = self.ctx.get_binop_t(&bin.op, &args, &self.ctx.name)?;
let mut args = args.into_iter();
let lhs = args.next().unwrap().expr;
let rhs = args.next().unwrap().expr;
Ok(hir::BinOp::new(bin.op, lhs, rhs, t))
}
fn lower_unary(&mut self, unary: ast::UnaryOp) -> LowerResult<hir::UnaryOp> {
log!("[DEBUG] entered {}({unary})", fn_name!());
let mut args = unary.args.into_iter();
let arg = hir::PosArg::new(self.lower_expr(*args.next().unwrap(), true)?);
let args = [arg];
let t = self.ctx.get_unaryop_t(&unary.op, &args, &self.ctx.name)?;
let mut args = args.into_iter();
let expr = args.next().unwrap().expr;
Ok(hir::UnaryOp::new(unary.op, expr, t))
}
fn lower_call(&mut self, call: ast::Call) -> LowerResult<hir::Call> {
log!("[DEBUG] entered {}({}(...))", fn_name!(), call.obj);
let (pos_args, kw_args, paren) = call.args.deconstruct();
let mut hir_args = hir::Args::new(
Vec::with_capacity(pos_args.len()),
Vec::with_capacity(kw_args.len()),
paren,
);
for arg in pos_args.into_iter() {
hir_args.push_pos(hir::PosArg::new(self.lower_expr(arg.expr, true)?));
}
for arg in kw_args.into_iter() {
hir_args.push_kw(hir::KwArg::new(
arg.keyword,
self.lower_expr(arg.expr, true)?,
));
}
let obj = self.lower_expr(*call.obj, false)?;
let t = self.ctx.get_call_t(
&obj,
&call.method_name,
&hir_args.pos_args,
&hir_args.kw_args,
&self.ctx.name,
)?;
Ok(hir::Call::new(obj, call.method_name, hir_args, t))
}
fn lower_lambda(&mut self, lambda: ast::Lambda) -> LowerResult<hir::Lambda> {
log!("[DEBUG] entered {}({lambda})", fn_name!());
let is_procedural = lambda.is_procedural();
let id = get_hash(&lambda.sig);
let name = format!("<lambda_{id}>");
let kind = if is_procedural {
ContextKind::Proc
} else {
ContextKind::Func
};
self.ctx.grow(&name, kind, Private)?;
self.ctx
.assign_params(&lambda.sig.params, None)
.map_err(|e| {
self.pop_append_errs();
e
})?;
self.ctx
.preregister(lambda.body.ref_payload())
.map_err(|e| {
self.pop_append_errs();
e
})?;
let body = self.lower_block(lambda.body).map_err(|e| {
self.pop_append_errs();
e
})?;
let (non_default_params, default_params): (Vec<_>, Vec<_>) = self
.ctx
.params
.iter()
.partition(|(_, v)| v.kind.has_default());
let non_default_params = non_default_params
.into_iter()
.map(|(name, vi)| {
ParamTy::new(name.as_ref().map(|n| n.inspect().clone()), vi.t.clone())
})
.collect();
let default_params = default_params
.into_iter()
.map(|(name, vi)| {
ParamTy::new(name.as_ref().map(|n| n.inspect().clone()), vi.t.clone())
})
.collect();
let bounds = self
.ctx
.instantiate_ty_bounds(&lambda.sig.bounds, RegistrationMode::Normal)
.map_err(|e| {
self.pop_append_errs();
e
})?;
self.pop_append_errs();
let t = if is_procedural {
Type::proc(non_default_params, default_params, body.t())
} else {
Type::func(non_default_params, default_params, body.t())
};
let t = if bounds.is_empty() {
t
} else {
Type::quantified(t, bounds)
};
Ok(hir::Lambda::new(id, lambda.sig.params, lambda.op, body, t))
}
fn lower_def(&mut self, def: ast::Def) -> LowerResult<hir::Def> {
log!("[DEBUG] entered {}({})", fn_name!(), def.sig);
self.ctx
.grow(def.sig.name_as_str(), ContextKind::Instant, Private)?;
let res = match def.sig {
ast::Signature::Subr(sig) => self.lower_subr_def(sig, def.body),
ast::Signature::Var(sig) => self.lower_var_def(sig, def.body),
};
self.pop_append_errs();
res
}
fn lower_var_def(
&mut self,
sig: ast::VarSignature,
body: ast::DefBody,
) -> LowerResult<hir::Def> {
log!("[DEBUG] entered {}({sig})", fn_name!());
self.ctx.preregister(body.block.ref_payload())?;
let block = self.lower_block(body.block)?;
let found_body_t = block.ref_t();
let opt_expect_body_t = self
.ctx
.outer
.as_ref()
.unwrap()
.get_current_scope_var(sig.inspect().unwrap())
.map(|vi| vi.t.clone());
let name = sig.pat.inspect().unwrap();
if let Some(expect_body_t) = opt_expect_body_t {
if let Err(e) = self.return_t_check(sig.loc(), name, &expect_body_t, found_body_t) {
self.errs.push(e);
}
}
let id = body.id;
self.ctx
.outer
.as_mut()
.unwrap()
.assign_var(&sig, id, found_body_t)?;
match block.first().unwrap() {
hir::Expr::Call(call) => {
if let ast::VarPattern::Ident(ident) = &sig.pat {
if call.is_import_call() {
self.ctx
.outer
.as_mut()
.unwrap()
.import_mod(&ident.name, &call.args.pos_args.first().unwrap().expr)?;
}
} else {
todo!()
}
}
_other => {}
}
let sig = hir::VarSignature::new(sig.pat, found_body_t.clone());
let body = hir::DefBody::new(body.op, block, body.id);
Ok(hir::Def::new(hir::Signature::Var(sig), body))
}
fn lower_subr_def(
&mut self,
sig: ast::SubrSignature,
body: ast::DefBody,
) -> LowerResult<hir::Def> {
log!("[DEBUG] entered {}({sig})", fn_name!());
let t = self
.ctx
.outer
.as_ref()
.unwrap()
.get_current_scope_var(sig.ident.inspect())
.unwrap_or_else(|| {
log!("{}\n", sig.ident.inspect());
log!("{}\n", self.ctx.outer.as_ref().unwrap());
panic!()
}) .t
.clone();
self.ctx.assign_params(&sig.params, None)?;
self.ctx.preregister(body.block.ref_payload())?;
let block = self.lower_block(body.block)?;
let found_body_t = block.ref_t();
let expect_body_t = t.return_t().unwrap();
if let Err(e) =
self.return_t_check(sig.loc(), sig.ident.inspect(), expect_body_t, found_body_t)
{
self.errs.push(e);
}
let id = body.id;
self.ctx
.outer
.as_mut()
.unwrap()
.assign_subr(&sig, id, found_body_t)?;
let sig = hir::SubrSignature::new(sig.ident, sig.params, t);
let body = hir::DefBody::new(body.op, block, body.id);
Ok(hir::Def::new(hir::Signature::Subr(sig), body))
}
fn lower_expr(&mut self, expr: ast::Expr, check: bool) -> LowerResult<hir::Expr> {
log!("[DEBUG] entered {}", fn_name!());
match expr {
ast::Expr::Lit(lit) => Ok(hir::Expr::Lit(hir::Literal::from(lit.token))),
ast::Expr::Array(arr) => Ok(hir::Expr::Array(self.lower_array(arr, check)?)),
ast::Expr::Accessor(acc) => Ok(hir::Expr::Accessor(self.lower_acc(acc, check)?)),
ast::Expr::BinOp(bin) => Ok(hir::Expr::BinOp(self.lower_bin(bin)?)),
ast::Expr::UnaryOp(unary) => Ok(hir::Expr::UnaryOp(self.lower_unary(unary)?)),
ast::Expr::Call(call) => Ok(hir::Expr::Call(self.lower_call(call)?)),
ast::Expr::Lambda(lambda) => Ok(hir::Expr::Lambda(self.lower_lambda(lambda)?)),
ast::Expr::Def(def) => Ok(hir::Expr::Def(self.lower_def(def)?)),
other => todo!("{other}"),
}
}
fn lower_block(&mut self, ast_block: ast::Block) -> LowerResult<hir::Block> {
log!("[DEBUG] entered {}", fn_name!());
let mut hir_block = Vec::with_capacity(ast_block.len());
for expr in ast_block.into_iter() {
let expr = self.lower_expr(expr, true)?;
hir_block.push(expr);
}
Ok(hir::Block::new(hir_block))
}
pub fn lower(&mut self, ast: AST, mode: &str) -> Result<(HIR, LowerWarnings), LowerErrors> {
log!("{GREEN}[DEBUG] the type-checking process has started.");
let mut module = hir::Module::with_capacity(ast.module.len());
self.ctx.preregister(ast.module.ref_payload())?;
for expr in ast.module.into_iter() {
match self
.lower_expr(expr, true)
.and_then(|e| self.use_check(e, mode))
{
Ok(expr) => {
module.push(expr);
}
Err(e) => {
self.errs.push(e);
}
}
}
let hir = HIR::new(ast.name, module);
log!("HIR (not derefed):\n{hir}");
let hir = self.ctx.deref_toplevel(hir)?;
log!(
"[DEBUG] {}() has completed, found errors: {}",
fn_name!(),
self.errs.len()
);
if self.errs.is_empty() {
log!("HIR:\n{hir}");
log!("[DEBUG] the type-checking process has completed.{RESET}");
Ok((hir, LowerWarnings::from(self.warns.take_all())))
} else {
log!("{RED}[DEBUG] the type-checking process has failed.{RESET}");
Err(LowerErrors::from(self.errs.take_all()))
}
}
}
impl Default for ASTLowerer {
fn default() -> Self {
Self::new()
}
}