From 9a81784d8331fb59465cb9eed6207ebd3ceb25ff Mon Sep 17 00:00:00 2001
From: lemon <lsof@mailbox.org>
Date: Mon, 15 Aug 2022 15:39:34 +0200
Subject: self hosted hello world parses

---
 src/parse.cff | 41 ++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 40 insertions(+), 1 deletion(-)

(limited to 'src/parse.cff')

diff --git a/src/parse.cff b/src/parse.cff
index 0f06259..f77c30f 100644
--- a/src/parse.cff
+++ b/src/parse.cff
@@ -587,6 +587,12 @@ fn parsetype(P *Parser) *const Type {
 // Expressions Parsing //
 /////////////////////////
 
+fn exprdup(alloc *Allocator, ex Expr) *Expr {
+   return memcpy(alloc->alloc(sizeof(ex)), &ex, sizeof(ex));
+}
+
+fn parseexpr(P *Parser) Expr;
+
 fn pexprimary(P *Parser) Expr {
    let tok Tok = lex(P);
    switch tok.t {
@@ -599,14 +605,46 @@ fn pexprimary(P *Parser) Expr {
    case :null;
       return { tok.loc, ty_voidptr, .u: :NullLit };
    case :str;
-      return { tok.loc, .u: :StrLit tok.u.str };
+      let ty = mkarrtype(tok.u.str.#len + 1, #t, ty_u8);
+      return { tok.loc, ty, .u: :StrLit tok.u.str };
+   case :ident;
+      let ident = tok.u.ident;
+      let decl = finddecl(P, ident);
+      if decl == #null {
+         fatal(P, tok.loc, "%qT is not defined", tok);
+      }
+      switch decl.u {
+      case Fn f;
+         return { tok.loc, f.ty, .u: :Symbol decl };
+      }
    case else;
       fatal(P, tok.loc, "expected expression (near %qT)", tok);
    }
 }
 
 fn pexpostfix(P *Parser) Expr {
+   let tok Tok = {};
    let ex = pexprimary(P);
+   for ;; {
+      switch {
+      case lexmatch(P, &tok, '(');
+         let lhs = exprdup(P.alloc, ex),
+             ty = lhs.ty.u.#tag == :Ptr ? lhs.ty.u.Ptr : lhs.ty;
+         if ty.u.#tag != :Fn {
+            fatal(P, lhs.loc, "not callable (%t)", lhs.ty);
+         }
+         let args Vec<Expr> = {};
+         while not lexmatch(P, #null, ')') {
+            args->push(parseexpr(P));
+            if not lexmatch(P, #null, ',') {
+               lexexpect(P, ')');
+               break;
+            }
+         }
+         ex = { tok.loc, .ty: ty.u.Fn.ret, .u: :Call { lhs, args->move(P.alloc) }};         
+      case else; break;
+      }
+   }
    return ex;
 }
 
@@ -770,6 +808,7 @@ extern fn parse(P *Parser) [#]Decl {
 
    envfree(P.curenv);
    aralloc->destroy();
+   decls->clear();
 }
 
 extern fn parser_init(P *Parser, path *const u8) void {
-- 
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