+python variant

ocaml/libsyntax/expr.ml

@@ -97,6 +97,27 @@ and parse_letbinds ps acc = match ps.lt () with
   | _ -> (acc, ps)
 
 and parse_expr ps = match ps.lt () with
+  | Seq.Cons ((Let, s), lt) ->
+      let (pat, ps) = Pattern.parse { ps with lt; offset = loc_span_end s; } in
+      let (pty, ps) = match parse_ty_annot ps with
+        | Some (x, y, ps) -> (Some (x, y), ps)
+        | None -> (None, ps)
+      in
+      let (_, ps) = require_token XLet Assign ps in
+      let value_start = ps.offset in
+      let (value_, ps) = parse_expr ps in
+      let value_span = loc_span_of_start_end value_start ps.offset in
+      let old_names = ps.names in
+      let new_names = Pattern.exports ps.names pat in
+      let ps = { ps with names = new_names } in
+      let (_, ps) = require_token XLet SemiColon ps in
+      let body_span_start = ps.offset in
+      let (body, ps) = parse_expr ps in
+      if ps.names <> new_names then failwith "invalid name book-keeping detected";
+      let ps = { ps with names = old_names } in
+      let lam = { pat; pty; body_span = Asai.Range.make (body_span_start, ps.offset); body; } in
+      (Apply (lam, value_span, value_), ps)
+    )
   | Seq.Cons ((Lambda, s), lt) -> (
       let ps = { ps with lt; offset = loc_span_end s; } in
       let (pat, ps) = Pattern.parse ps in

ocaml/libsyntax/lex.ml

@@ -83,7 +83,7 @@ let tokens lx () =
       let res = LLiteral (Sedlexing.Utf8.lexeme buf |> fun x -> Literal.LNatural (int_of_string x)) in
       Some (l_encap_curr lx res)
     | l_ident ->
-      let cur = Sedlexing.Utf8.lexeme buf |> normalize_utf_8 `NFC in
+      let cur = Sedlexing.Utf8.lexeme buf |> normalize_utf_8 `NFKC in
       let res = match Literal.of_string cur with
         | Some x -> LLiteral x
         | None -> match cur with

ocaml/libsyntax/literal.ml

@@ -17,6 +17,7 @@ type lit =
   | LNatural of int
   | LInterval0
   | LInterval1
+  | LRefl
   [@@deriving show, eq]
 
 let lty x = LTy x
@@ -51,8 +52,9 @@ let of_string = function
   | "String"    -> LTy String   |> Option.some
   | "Interval"  -> LTy Interval |> Option.some
   | "IntSize"   -> LTy TIntSize |> Option.some
-  | "Intv0"     -> LInterval0   |> Option.some
-  | "Intv1"     -> LInterval1   |> Option.some
+  | "intv0"     -> LInterval0   |> Option.some
+  | "intv1"     -> LInterval1   |> Option.some
+  | "refl"      -> LRefl        |> Option.some
 
   | s ->  (if String.starts_with ~prefix:"ZI" s then
                str_post 2 s |> isz_of_str |> Option.map (fun x -> LIntSize x)
@@ -76,5 +78,6 @@ let to_string = function
   | LTy (UnsInt sz) -> "UI" ^ (isz_to_str sz)
   | LTy (SigInt sz) -> "SI" ^ (isz_to_str sz)
   | LNatural n      -> Int.to_string n
-  | LInterval0      -> "Intv0"
-  | LInterval1      -> "Intv1"
+  | LInterval0      -> "intv0"
+  | LInterval1      -> "intv1"
+  | LRefl           -> "refl"

ocaml/libsyntax/literal.mli

@@ -17,6 +17,7 @@ type lit =
   | LNatural of int
   | LInterval0
   | LInterval1
+  | LRefl
   [@@deriving show, eq]
 
 val isz_to_pow : int_size -> char

python/LICENSE

@@ -0,0 +1,68 @@
+Apache License
+Version 2.0, January 2004
+http://www.apache.org/licenses/
+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+1. Definitions.
+
+"License" shall mean the terms and conditions for use, reproduction, and distribution as defined by Sections 1 through 9 of this document.
+
+"Licensor" shall mean the copyright owner or entity authorized by the copyright owner that is granting the License.
+
+"Legal Entity" shall mean the union of the acting entity and all other entities that control, are controlled by, or are under common control with that entity. For the purposes of this definition, "control" means (i) the power, direct or indirect, to cause the direction or management of such entity, whether by contract or otherwise, or (ii) ownership of fifty percent (50%) or more of the outstanding shares, or (iii) beneficial ownership of such entity.
+
+"You" (or "Your") shall mean an individual or Legal Entity exercising permissions granted by this License.
+
+"Source" form shall mean the preferred form for making modifications, including but not limited to software source code, documentation source, and configuration files.
+
+"Object" form shall mean any form resulting from mechanical transformation or translation of a Source form, including but not limited to compiled object code, generated documentation, and conversions to other media types.
+
+"Work" shall mean the work of authorship, whether in Source or Object form, made available under the License, as indicated by a copyright notice that is included in or attached to the work (an example is provided in the Appendix below).
+
+"Derivative Works" shall mean any work, whether in Source or Object form, that is based on (or derived from) the Work and for which the editorial revisions, annotations, elaborations, or other modifications represent, as a whole, an original work of authorship. For the purposes of this License, Derivative Works shall not include works that remain separable from, or merely link (or bind by name) to the interfaces of, the Work and Derivative Works thereof.
+
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+5. Submission of Contributions.
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+Unless You explicitly state otherwise, any Contribution intentionally submitted for inclusion in the Work by You to the Licensor shall be under the terms and conditions of this License, without any additional terms or conditions. Notwithstanding the above, nothing herein shall supersede or modify the terms of any separate license agreement you may have executed with Licensor regarding such Contributions.
+
+6. Trademarks.
+
+This License does not grant permission to use the trade names, trademarks, service marks, or product names of the Licensor, except as required for reasonable and customary use in describing the origin of the Work and reproducing the content of the NOTICE file.
+
+7. Disclaimer of Warranty.
+
+Unless required by applicable law or agreed to in writing, Licensor provides the Work (and each Contributor provides its Contributions) on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied, including, without limitation, any warranties or conditions of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A PARTICULAR PURPOSE. You are solely responsible for determining the appropriateness of using or redistributing the Work and assume any risks associated with Your exercise of permissions under this License.
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+8. Limitation of Liability.
+
+In no event and under no legal theory, whether in tort (including negligence), contract, or otherwise, unless required by applicable law (such as deliberate and grossly negligent acts) or agreed to in writing, shall any Contributor be liable to You for damages, including any direct, indirect, special, incidental, or consequential damages of any character arising as a result of this License or out of the use or inability to use the Work (including but not limited to damages for loss of goodwill, work stoppage, computer failure or malfunction, or any and all other commercial damages or losses), even if such Contributor has been advised of the possibility of such damages.
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+9. Accepting Warranty or Additional Liability.
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+
+END OF TERMS AND CONDITIONS

python/Yanais_bootstrap/__init__.py

@@ -0,0 +1 @@
+__version__ = '0.0.1'

python/Yanais_bootstrap/__main__.py

@@ -0,0 +1,2 @@
+"""yanais bootstrapping interpreter"""
+

python/Yanais_bootstrap/lex.py

@@ -0,0 +1,121 @@
+"""A lexer for yanais"""
+
+from typing import Optional
+import unicodedata
+
+def normalize_ident(s: str) -> str:
+    return unicodedata.normalize('NFKC', s)
+
+class Span:
+    def __init__(self, fname: str, start: int, length: int):
+        self.fname = fname
+        self.start = start
+        self.length = length
+
+    def __str__(self):
+        return f'{self.fname}: {self.start}..+{self.length}'
+
+class LexerError(Exception):
+    def __init__(self, src: Span, dat, *args):
+        super().__init__(args)
+        self.src = src
+        self.dat = dat
+
+    def __str__(self):
+        return f'{self.src}: {self.dat}'
+
+class Lexer:
+    def __init__(self, fname: str, buf: str):
+        self.src = Span(fname, 0, len(buf.encode('utf-8')))
+        self.buf = buf
+
+    def _handle_comments(self):
+        src = self.src
+        buf = self.buf
+        lvl = 0
+        try:
+            while True:
+                while buf[0].isspace():
+                    src.start += len(buf[0].encode('utf-8'))
+                    buf = buf[1:]
+                if buf.startswith('(*'):
+                    src.start += 2
+                    buf = buf[2:]
+                    lvl += 1
+                elif lvl > 0:
+                    if buf.startswith('*)'):
+                        src.start += 2
+                        buf = buf[2:]
+                        lvl -= 1
+                    elif not buf:
+                        raise LexerError(Span(src.fname, src.start, 0), 'Unexpected EOF')
+                    else:
+                        ch = buf[0]
+                        src.start += len(ch.encode('utf-8'))
+                        buf = buf[1:]
+                else:
+                    break
+        finally:
+            self.src = src
+            self.buf = buf
+
+    def _handle_string(self):
+        """gets invoked after ""... """
+        ret = ""
+        src = self.src
+        buf = self.buf
+
+        try:
+            while True:
+                if buf.startswith("\\"):
+                    src.start += 1
+                    buf = buf[1:]
+                    if not buf:
+                        raise LexerError(Span(src.fname, src.start, 0), 'Unexpected EOF')
+                    match buf[0]:
+                        case 'b':
+                            ret += "\b"
+                        case 'n':
+                            ret += "\n"
+                        case 'r':
+                            ret += "\r"
+                        case 't':
+                            ret += "\t"
+                        case '"':
+                            ret += "\""
+                        case oth:
+                            raise LexerError(Span(src.fname, src.start - 1, 2), "Unexpected escape sequence")
+
+                elif buf.startswith("\""):
+                    src.start += 1
+                    buf = buf[1:]
+                    break
+
+                elif not buf:
+                    raise LexerError(Span(src.fname, src.start, 0), 'Unexpected EOF')
+
+                else:
+                    ch = buf[0]
+                    src.start += len(ch.encode('utf-8'))
+                    buf = buf[1:]
+
+        finally:
+            self.src = src
+            self.buf = buf
+
+    def _eat_number(self) -> Optional[int]:
+        if not self.buf:
+            return None
+        elif self.buf[0].isascii() and self.buf[0].isdecimal():
+            coll = ""
+            while self.buf and self.buf[0].isascii() and self.buf[0].isdecimal():
+                coll += self.buf[0]
+                self.buf = self.buf[1:]
+            return int(coll)
+        else:
+            return None
+
+    def _eat_ident(self) -> Optional[str]:
+        if not self.buf:
+            return None
+        pass...

python/pyproject.toml

@@ -0,0 +1,41 @@
+[build-system]
+requires = ["flit_core >=3.2,<4"]
+build-backend = "flit_core.buildapi"
+
+[project]
+name = "Yanais-bootstrap"
+description = "Yanais interpreter for bootstrapping"
+readme = "README.md"
+license = {file = "LICENSE"}
+classifiers = [
+  "Development Status :: 4 - Beta",
+  "License :: OSI Approved :: Apache Software License",
+]
+requires-python = ">=3.9"
+dynamic = ["version"]
+dependencies = [
+]
+
+[project.optional-dependencies]
+test = [
+  "pytest >=7.1.2",
+]
+
+[[project.authors]]
+name = "Alain Zscheile"
+email = "fogti+devel@ytrizja.de"
+
+[project.urls]
+Home = "https://git.exozy.me/fogti/yanais"
+
+[tool.flit.sdist]
+exclude = [
+  ".gitignore",
+  "build",
+  "debian",
+  "venv",
+  ".mypy_cache",
+]
+include = [
+  "src/Yanais_bootstrap/py.typed",
+]

rust/crates/yanais-typeck/src/lib.rs

@@ -1,8 +1,18 @@
+use std::sync::Arc;
+use yanais_literal::Literal;
+use yanais_syntax::EvEqSourceSpan;
+
 pub mod egraph;
 
 pub use egraph::Expr;
 use Expr as Type;
 
+#[derive(Clone, Debug)]
+pub struct LambdaV {
+    pub body_span: EvEqSourceSpan,
+    pub body: Box<Value>
+}
+
 #[derive(Clone, Debug, thiserror::Error)]
 pub enum Error {
     #[error("unable to infer type")]
@@ -20,13 +30,27 @@ pub enum BinderState {
     Used,
 }
 
+pub type Result<T> = core::result::Result<T, Error>;
+
+#[derive(Clone, Debug)]
+pub enum Value {
+    // `Infer` is not a valid value (if it can't be inferred, it's invalid)
+    // `Use` gets replaced by what's used
+    // patterns get represented as pointwise extraction instead
+
+    Literal(Literal),
+    RefOf(Arc<Value>),
+
+    Lambda(EvEqSourceSpan, Box<Fn() -> Result<Value>>),
+
+    // pointwise extraction
+}
+
 #[derive(Clone, Debug)]
 pub struct TyContext {
     pub binders: Vec<BinderState>,
 }
 
-pub type Result<T> = core::result::Result<T, Error>;
-
 pub trait TypeCheckPattern {
     fn type_check_pat(&self, ctx: &mut TyContext) -> Result<()>;
 }