compiler: add struct types

slige/compiler/ast/ast.ts

@@ -48,6 +48,7 @@ export type Item = {
     span: Span;
     ident: Ident;
     pub: boolean;
+    attrs: Attr[];
 };
 
 export type ItemKind =
@@ -95,11 +96,11 @@ export type VariantDataKind =
     | { tag: "tuple" } & TupleVariantData
     | { tag: "struct" } & StructVariantData;
 
-export type TupleVariantData = { elems: VariantData[] };
+export type TupleVariantData = { elems: FieldDef[] };
 export type StructVariantData = { fields: FieldDef[] };
 
 export type FieldDef = {
-    ident: Ident;
+    ident?: Ident;
     ty: Ty;
     pub: boolean;
     span: Span;
@@ -251,6 +252,7 @@ export type AnonFieldDef = {
 };
 
 export type Path = {
+    id: AstId;
     segments: PathSegment[];
     span: Span;
 };
@@ -266,3 +268,9 @@ export type Ident = {
     text: string;
     span: Span;
 };
+
+export type Attr = {
+    ident: Ident;
+    args?: Expr[];
+    span: Span;
+};

slige/compiler/ast/cx.ts

@@ -1,11 +1,14 @@
 import { AstId, Ids, Span } from "@slige/common";
 import {
+    Attr,
     Expr,
     ExprKind,
     Ident,
     Item,
     ItemKind,
     Pat,
+    Path,
+    PathSegment,
     PatKind,
     Stmt,
     StmtKind,
@@ -30,9 +33,10 @@ export class Cx {
         span: Span,
         ident: Ident,
         pub: boolean,
+        attrs: Attr[],
     ): Item {
         const id = this.id();
-        return { id, kind, span, ident, pub };
+        return { id, kind, span, ident, pub, attrs };
     }
 
     public expr(kind: ExprKind, span: Span): Expr {
@@ -49,4 +53,9 @@ export class Cx {
         const id = this.id();
         return { id, kind, span };
     }
+
+    public path(segments: PathSegment[], span: Span): Path {
+        const id = this.id();
+        return { id, segments, span };
+    }
 }

slige/compiler/ast/visitor.ts

@@ -18,6 +18,7 @@ import {
     EnumItem,
     Expr,
     ExprStmt,
+    FieldDef,
     FieldExpr,
     File,
     FnItem,
@@ -91,6 +92,8 @@ export interface Visitor<
     visitTypeAliasItem?(item: Item, kind: TypeAliasItem, ...p: P): R;
 
     visitVariant?(variant: Variant, ...p: P): R;
+    visitVariantData?(data: VariantData, ...p: P): R;
+    visitFieldDef?(field: FieldDef, ...p: P): R;
 
     visitExpr?(expr: Expr, ...p: P): R;
     visitErrorExpr?(expr: Expr, ...p: P): R;
@@ -291,6 +294,7 @@ export function visitVariantData<
     data: VariantData,
     ...p: P
 ) {
+    if (v.visitVariantData?.(data, ...p) === "stop") return;
     const dk = data.kind;
     switch (dk.tag) {
         case "error":
@@ -299,19 +303,30 @@ export function visitVariantData<
             return;
         case "tuple":
             for (const elem of dk.elems) {
-                visitVariantData(v, elem, ...p);
+                visitFieldDef(v, elem, ...p);
             }
             return;
         case "struct":
             for (const field of dk.fields) {
-                visitIdent(v, field.ident, ...p);
+                visitFieldDef(v, field, ...p);
-                visitTy(v, field.ty, ...p);
             }
             return;
     }
     exhausted(dk);
 }
 
+export function visitFieldDef<
+    P extends PM = [],
+>(
+    v: Visitor<P>,
+    field: FieldDef,
+    ...p: P
+) {
+    if (v.visitFieldDef?.(field, ...p) === "stop") return;
+    field.ident && visitIdent(v, field.ident, ...p);
+    visitTy(v, field.ty, ...p);
+}
+
 export function visitGenerics<
     P extends PM = [],
 >(

slige/compiler/check/checker.ts

@@ -12,7 +12,7 @@ import {
     todo,
 } from "@slige/common";
 import * as resolve from "@slige/resolve";
-import { Ty, tyToString } from "@slige/ty";
+import { ElemDef, FieldDef, Ty, tyToString, VariantData } from "@slige/ty";
 
 export class Checker {
     private stmtChecked = new IdSet<AstId>();
@@ -232,6 +232,44 @@ export class Checker {
         exhausted(k);
     }
 
+    public structItemTy(item: ast.Item, kind: ast.StructItem): Ty {
+        return this.itemTys.get(item.id) ?? this.checkStructItem(item, kind);
+    }
+
+    private checkStructItem(item: ast.Item, kind: ast.StructItem): Ty {
+        const data = this.checkVariantData(kind.data);
+        return Ty({ tag: "struct", item, kind, data });
+    }
+
+    private checkVariantData(data: ast.VariantData): VariantData {
+        const k = data.kind;
+        switch (k.tag) {
+            case "error":
+                return { tag: "error" };
+            case "unit":
+                return { tag: "unit" };
+            case "tuple": {
+                const elems = k.elems
+                    .map(({ ty, pub }): ElemDef => ({
+                        ty: this.tyTy(ty),
+                        pub,
+                    }));
+                return { tag: "tuple", elems };
+            }
+            case "struct": {
+                const fields = k.fields
+                    .map(({ ident, ty, pub }): FieldDef => {
+                        if (!ident) {
+                            throw new Error();
+                        }
+                        return { ident: ident.id, ty: this.tyTy(ty), pub };
+                    });
+                return { tag: "struct", fields };
+            }
+        }
+        exhausted(k);
+    }
+
     public fnItemTy(item: ast.Item, kind: ast.FnItem): Ty {
         return this.itemTys.get(item.id) ?? this.checkFnItem(item, kind);
     }
@@ -270,7 +308,7 @@ export class Checker {
             case "repeat":
                 return todo();
             case "struct":
-                return todo();
+                return this.checkStructExpr(expr, k, expected);
             case "ref":
                 return todo();
             case "deref":
@@ -312,6 +350,13 @@ export class Checker {
         switch (res.kind.tag) {
             case "error":
                 return Ty({ tag: "error" });
+            case "enum":
+            case "struct":
+                return todo("return a ctor here");
+            case "variant":
+                return todo("return a ctor here");
+            case "field":
+                throw new Error();
             case "fn": {
                 const fn = res.kind.item;
                 const ty = this.fnItemTy(fn, res.kind.kind);
@@ -336,6 +381,70 @@ export class Checker {
         exhausted(res.kind);
     }
 
+    private checkStructExpr(
+        expr: ast.Expr,
+        kind: ast.StructExpr,
+        expected: Ty,
+    ): Ty {
+        if (!kind.path) {
+            return todo();
+        }
+        const res = this.re.pathRes(kind.path.id);
+        if (res.kind.tag !== "struct") {
+            this.report("type is not a struct", kind.path.span);
+            const ty = Ty({ tag: "error" });
+            this.exprTys.set(expr.id, ty);
+            return ty;
+        }
+        const ty = this.structItemTy(res.kind.item, res.kind.kind);
+        this.exprTys.set(expr.id, ty);
+        if (ty.kind.tag === "error") {
+            return ty;
+        }
+        if (ty.kind.tag !== "struct") {
+            throw new Error();
+        }
+        const data = ty.kind.data;
+        if (data.tag !== "struct") {
+            this.report("struct data not a struct", kind.path.span);
+            const ty = Ty({ tag: "error" });
+            this.exprTys.set(expr.id, ty);
+            return ty;
+        }
+        const notCovered = new Set<FieldDef>();
+        for (const field of data.fields) {
+            notCovered.add(field);
+        }
+        for (const field of kind.fields) {
+            const found = data.fields
+                .find((f) => f.ident === field.ident.id);
+            if (!found) {
+                this.report(`no field named '${field.ident.text}'`, field.span);
+                return ty;
+            }
+            const fieldTy = this.exprTy(field.expr);
+            const tyRes = this.resolveTys(fieldTy, found.ty);
+            if (!tyRes.ok) {
+                this.report(tyRes.val, field.span);
+                return ty;
+            }
+            notCovered.delete(found);
+        }
+        if (notCovered.size !== 0) {
+            this.report(
+                `fields ${
+                    notCovered
+                        .keys()
+                        .toArray()
+                        .map((field) => `'${field}'`)
+                        .join(", ")
+                } not covered`,
+                expr.span,
+            );
+        }
+        return ty;
+    }
+
     private checkCallExpr(
         expr: ast.Expr,
         kind: ast.CallExpr,
@@ -552,13 +661,32 @@ export class Checker {
                 return Ty({ tag: "int" });
             case "bool":
             case "str":
-            case "path":
+                return todo(k.tag);
+            case "path": {
+                const re = this.re.tyRes(ty.id);
+                const k = re.kind;
+                switch (k.tag) {
+                    case "error":
+                        return Ty({ tag: "error" });
+                    case "enum":
+                        return todo();
+                    case "struct":
+                        return this.structItemTy(k.item, k.kind);
+                    case "fn":
+                    case "variant":
+                    case "field":
+                    case "local":
+                        return todo();
+                }
+                exhausted(k);
+                return todo();
+            }
             case "ref":
             case "ptr":
             case "slice":
             case "array":
             case "anon_struct":
-                return todo(k);
+                return todo(k.tag);
         }
         exhausted(k);
     }
@@ -611,7 +739,7 @@ export class Checker {
 
     private resolveTys(a: Ty, b: Ty): Res<Ty, string> {
         if (a.kind.tag === "error" || b.kind.tag === "error") {
-            return Res.Ok(a);
+            return Res.Ok(Ty({ tag: "error" }));
         }
         if (b.kind.tag === "unknown") {
             return Res.Ok(a);
@@ -653,6 +781,15 @@ export class Checker {
                 }
                 return Res.Ok(a);
             }
+            case "struct": {
+                if (b.kind.tag !== "struct") {
+                    return incompat();
+                }
+                if (a.kind.item.id !== b.kind.item.id) {
+                    return incompat();
+                }
+                return Res.Ok(a);
+            }
         }
         exhausted(a.kind);
     }

slige/compiler/deno.jsonc

@@ -4,6 +4,7 @@
         "./check",
         "./middle",
         "./parse",
+        "./pat",
         "./resolve",
         "./ty",
         "./common",

slige/compiler/middle/ast_lower.ts

@@ -307,6 +307,11 @@ export class FnLowerer {
         switch (re.kind.tag) {
             case "error":
                 return { tag: "error" };
+            case "enum":
+            case "struct":
+            case "variant":
+            case "field":
+                return todo();
             case "fn":
             case "local":
                 return {
@@ -617,6 +622,11 @@ export class FnLowerer {
         switch (re.kind.tag) {
             case "error":
                 return { tag: "error" };
+            case "enum":
+            case "struct":
+            case "variant":
+            case "field":
+                return todo();
             case "local": {
                 const patRes = this.re.patRes(re.kind.id);
                 const ty = this.ch.exprTy(expr);
@@ -651,6 +661,7 @@ export class FnLowerer {
                 case "bool":
                     return true;
                 case "fn":
+                case "struct":
                     return false;
             }
             exhausted(ty.kind);

slige/compiler/parse/parser.ts

@@ -1,12 +1,14 @@
 import {
     AnonFieldDef,
     AssignType,
+    Attr,
     BinaryType,
     Block,
     Cx,
     Expr,
     ExprField,
     ExprKind,
+    FieldDef,
     File,
     GenericParam,
     Ident,
@@ -23,8 +25,10 @@ import {
     Ty,
     TyKind,
     UnaryType,
+    Variant,
+    VariantData,
 } from "@slige/ast";
-import { Ctx, File as CtxFile, Res, Span } from "@slige/common";
+import { Ctx, File as CtxFile, Res, Span, todo } from "@slige/common";
 import { Lexer } from "./lexer.ts";
 import { TokenIter } from "./token.ts";
 import { SigFilter } from "./token.ts";
@@ -63,12 +67,15 @@ export class Parser {
     }
 
     private parseStmt(): Stmt {
+        const attrs = this.parseAttrs();
         if (
-            ["#", "pub", "mod", "fn"].some((tt) => this.test(tt))
+            ["pub", "mod", "enum", "struct", "fn", "type_alias"].some((tt) =>
+                this.test(tt)
+            )
         ) {
-            return this.parseItemStmt();
+            return this.parseItemStmt(undefined, false, attrs);
         } else if (
-            ["let", "type_alias", "return", "break"].some((tt) => this.test(tt))
+            ["let", "return", "break"].some((tt) => this.test(tt))
         ) {
             const expr = this.parseSingleLineBlockStmt();
             this.eatSemicolon();
@@ -85,6 +92,45 @@ export class Parser {
         }
     }
 
+    private parseAttrs(): Attr[] {
+        const attrs: Attr[] = [];
+        while (this.test("#")) {
+            const begin = this.span();
+            this.step();
+            if (!this.test("[")) {
+                this.report("expected '['");
+                return attrs;
+            }
+            this.step();
+            if (!this.test("ident")) {
+                this.report("expected 'ident'");
+                return attrs;
+            }
+            const ident = this.parseIdent();
+            let args: Expr[] | undefined = undefined;
+            if (this.test("(")) {
+                this.step();
+                args = this.parseDelimitedList(
+                    this.parseAttrArg,
+                    ")",
+                    ",",
+                );
+            }
+            if (!this.test("]")) {
+                this.report("expected ']'");
+                return attrs;
+            }
+            const end = this.span();
+            this.step();
+            attrs.push({ ident, args, span: Span.fromto(begin, end) });
+        }
+        return attrs;
+    }
+
+    private parseAttrArg(): Res<Expr, undefined> {
+        return Res.Ok(this.parseExpr());
+    }
+
     private parseMultiLineBlockExpr(): Expr {
         const begin = this.span();
         if (this.test("{")) {
@@ -111,9 +157,6 @@ export class Parser {
         if (this.test("let")) {
             return this.parseLet();
         }
-        if (this.test("type_alias")) {
-            return this.parseTypeAlias();
-        }
         if (this.test("return")) {
             return this.parseReturn();
         }
@@ -143,16 +186,19 @@ export class Parser {
         this.step();
         const stmts: Stmt[] = [];
         while (!this.done()) {
+            const attrs = this.parseAttrs();
             if (this.test("}")) {
                 const span = Span.fromto(begin, this.span());
                 this.step();
                 return Res.Ok({ stmts, span });
             } else if (
-                ["#", "pub", "mod", "fn"].some((tt) => this.test(tt))
+                ["pub", "mod", "enum", "struct", "fn", "type_alias"].some((
+                    tt,
+                ) => this.test(tt))
             ) {
-                stmts.push(this.parseItemStmt());
+                stmts.push(this.parseItemStmt(undefined, false, attrs));
             } else if (
-                ["let", "type_alias", "return", "break"]
+                ["let", "return", "break"]
                     .some((tt) => this.test(tt))
             ) {
                 stmts.push(this.parseSingleLineBlockStmt());
@@ -210,67 +256,29 @@ export class Parser {
 
     private parseItemStmt(
         pos = this.span(),
-        details: StmtDetails = {
+        pub: boolean,
-            pub: false,
+        attrs: Attr[],
-            annos: [],
-        },
     ): Stmt {
-        const sbegin = this.span();
+        if (this.test("pub") && !pub) {
-        if (this.test("#") && !details.pub) {
             this.step();
-            if (!this.test("[")) {
+            return this.parseItemStmt(pos, pub, attrs);
-                this.report("expected '['");
-                return this.stmt({ tag: "error" }, sbegin);
-            }
-            this.step();
-            if (!this.test("ident")) {
-                this.report("expected 'ident'");
-                return this.stmt({ tag: "error" }, sbegin);
-            }
-            const ident = this.parseIdent();
-            const args: Expr[] = [];
-            if (this.test("(")) {
-                this.step();
-                if (!this.done() && !this.test(")")) {
-                    args.push(this.parseExpr());
-                    while (this.test(",")) {
-                        this.step();
-                        if (this.done() || this.test(")")) {
-                            break;
-                        }
-                        args.push(this.parseExpr());
-                    }
-                }
-                if (!this.test(")")) {
-                    this.report("expected ')'");
-                    return this.stmt({ tag: "error" }, sbegin);
-                }
-                this.step();
-            }
-            if (!this.test("]")) {
-                this.report("expected ']'");
-                return this.stmt({ tag: "error" }, sbegin);
-            }
-            this.step();
-            const anno = { ident, args, pos: sbegin };
-            return this.parseItemStmt(pos, {
-                ...details,
-                annos: [...details.annos, anno],
-            });
-        } else if (this.test("pub") && !details.pub) {
-            this.step();
-            return this.parseItemStmt(pos, { ...details, pub: true });
         } else if (this.test("mod")) {
-            return this.parseMod(details);
+            return this.parseModItem(pub, attrs);
+        } else if (this.test("enum")) {
+            return this.parseEnumItem(pub, attrs);
+        } else if (this.test("struct")) {
+            return this.parseStructItem(pub, attrs);
         } else if (this.test("fn")) {
-            return this.parseFn(details);
+            return this.parseFnItem(pub, attrs);
+        } else if (this.test("type_alias")) {
+            return this.parseTypeAliasItem(pub, attrs);
         } else {
             this.report("expected item statement");
             return this.stmt({ tag: "error" }, pos);
         }
     }
 
-    private parseMod(details: StmtDetails): Stmt {
+    private parseModItem(pub: boolean, attrs: Attr[]): Stmt {
         const pos = this.span();
         this.step();
         if (!this.test("ident")) {
@@ -288,7 +296,8 @@ export class Parser {
                     { tag: "mod_file", filePath },
                     pos,
                     ident,
-                    details.pub,
+                    pub,
+                    attrs,
                 ),
             }, pos);
         }
@@ -322,12 +331,123 @@ export class Parser {
                 },
                 pos,
                 ident,
-                details.pub,
+                pub,
+                attrs,
             ),
         }, pos);
     }
 
-    private parseFn(details: StmtDetails): Stmt {
+    private parseEnumItem(pub: boolean, attrs: Attr[]): Stmt {
+        const begin = this.span();
+        this.step();
+        if (!this.test("ident")) {
+            this.report("expected ident");
+            return this.stmt({ tag: "error" }, begin);
+        }
+        const ident = this.parseIdent();
+        if (!this.test("{")) {
+            this.report("expected '{'");
+            return this.stmt({ tag: "error" }, begin);
+        }
+        this.step();
+        const endSpan: [Span] = [begin];
+        const variants = this.parseDelimitedList(
+            this.parseVariant,
+            "}",
+            ",",
+            endSpan,
+        );
+        const span = Span.fromto(begin, endSpan[0]);
+        return this.stmt({
+            tag: "item",
+            item: this.item({ tag: "enum", variants }, span, ident, pub, attrs),
+        }, span);
+    }
+
+    private parseVariant(): Res<Variant, undefined> {
+        const begin = this.span();
+        let pub = false;
+        if (this.test("pub")) {
+            this.step();
+            pub = true;
+        }
+        if (!this.test("ident")) {
+            this.report("expected 'ident'");
+            return Res.Err(undefined);
+        }
+        const ident = this.parseIdent();
+        const data = this.parseVariantData();
+        return Res.Ok({
+            ident,
+            data,
+            pub,
+            span: Span.fromto(begin, data.span),
+        });
+    }
+
+    private parseStructItem(pub: boolean, attrs: Attr[]): Stmt {
+        const begin = this.span();
+        this.step();
+        if (!this.test("ident")) {
+            this.report("expected ident");
+            return this.stmt({ tag: "error" }, begin);
+        }
+        const ident = this.parseIdent();
+        const data = this.parseVariantData();
+        const span = Span.fromto(begin, data.span);
+        return this.stmt({
+            tag: "item",
+            item: this.item({ tag: "struct", data }, span, ident, pub, attrs),
+        }, span);
+    }
+
+    private parseVariantData(): VariantData {
+        const begin = this.span();
+        if (this.test("(")) {
+            const elems = this.parseDelimitedList(this.parseFieldDef, ")", ",");
+            return {
+                kind: { tag: "tuple", elems },
+                span: Span.fromto(begin, elems.at(-1)?.span ?? begin),
+            };
+        } else if (this.test("{")) {
+            const fields = this.parseDelimitedList(
+                this.parseFieldDef,
+                "}",
+                ",",
+            );
+            return {
+                kind: { tag: "struct", fields },
+                span: Span.fromto(begin, fields.at(-1)?.span ?? begin),
+            };
+        } else {
+            return {
+                kind: { tag: "unit" },
+                span: { begin: begin.end, end: begin.end },
+            };
+        }
+    }
+
+    private parseFieldDef(): Res<FieldDef, undefined> {
+        const begin = this.span();
+        let pub = false;
+        if (this.test("pub")) {
+            this.step();
+            pub = true;
+        }
+        let ident: Ident | undefined = undefined;
+        if (this.test("ident")) {
+            ident = this.parseIdent();
+            if (!this.test(":")) {
+                this.report("expected ':'");
+                return Res.Err(undefined);
+            }
+            this.step();
+        }
+        const ty = this.parseTy();
+        return Res.Ok({ ident, ty, pub, span: Span.fromto(begin, ty.span) });
+    }
+
+    private parseFnItem(pub: boolean, attrs: Attr[]): Stmt {
         const pos = this.span();
         this.step();
         if (!this.test("ident")) {
@@ -373,7 +493,8 @@ export class Parser {
                 },
                 pos,
                 ident,
-                details.pub,
+                pub,
+                attrs,
             ),
         }, pos);
     }
@@ -400,6 +521,7 @@ export class Parser {
         parseElem: (this: Parser, index: number) => ParseRes<T>,
         endToken: string,
         delimiter: string,
+        outEndSpan?: [Span],
     ): T[] {
         this.step();
         if (this.test(endToken)) {
@@ -430,6 +552,7 @@ export class Parser {
             this.report(`expected '${endToken}'`);
             return elems;
         }
+        outEndSpan && (outEndSpan[0] = this.span());
         this.step();
         return elems;
     }
@@ -468,7 +591,7 @@ export class Parser {
         return this.stmt({ tag: "let", pat, ty, expr }, pos);
     }
 
-    private parseTypeAlias(): Stmt {
+    private parseTypeAliasItem(pub: boolean, attrs: Attr[]): Stmt {
         const begin = this.span();
         this.step();
         if (!this.test("ident")) {
@@ -491,7 +614,8 @@ export class Parser {
                 },
                 Span.fromto(begin, ty.span),
                 ident,
-                false,
+                pub,
+                attrs,
             ),
         }, begin);
     }
@@ -644,7 +768,7 @@ export class Parser {
         return this.expr({ tag: "array", exprs }, pos);
     }
 
-    private parseStruct(): Expr {
+    private parseAnonStructExpr(): Expr {
         const pos = this.span();
         this.step();
         if (!this.test("{")) {
@@ -906,7 +1030,6 @@ export class Parser {
                 return this.expr({ tag: "error" }, pos);
             }
             if (this.test("{") && !(rs & ExprRestricts.NoStructs)) {
-                this.step();
                 const fields = this.parseDelimitedList(
                     this.parseExprField,
                     "}",
@@ -955,7 +1078,7 @@ export class Parser {
             return this.parseArray();
         }
         if (this.test("struct")) {
-            return this.parseStruct();
+            return this.parseAnonStructExpr();
         }
         if (this.test("{")) {
             return this.parseBlockExpr();
@@ -1166,7 +1289,7 @@ export class Parser {
                 span: Span.fromto(begin, end),
             });
         }
-        return Res.Ok({ segments, span: Span.fromto(begin, end) });
+        return Res.Ok(this.path(segments, Span.fromto(begin, end)));
     }
 
     private parseTyRes(): ParseRes<Ty> {
@@ -1229,8 +1352,9 @@ export class Parser {
         span: Span,
         ident: Ident,
         pub: boolean,
+        attrs: Attr[],
     ): Item {
-        return this.cx.item(kind, span, ident, pub);
+        return this.cx.item(kind, span, ident, pub, attrs);
     }
 
     private expr(kind: ExprKind, span: Span): Expr {
@@ -1244,6 +1368,10 @@ export class Parser {
     private ty(kind: TyKind, span: Span): Ty {
         return this.cx.ty(kind, span);
     }
+
+    private path(segments: PathSegment[], span: Span): Path {
+        return this.cx.path(segments, span);
+    }
 }
 
 const ExprRestricts = {

slige/compiler/pat/ctor.ts

@@ -0,0 +1,7 @@
+export type Ctor = {
+    kind: CtorKind;
+};
+
+export type CtorKind =
+    | { tag: "error" }
+    | { tag: "struct" };

slige/compiler/pat/deno.jsonc

@@ -0,0 +1,4 @@
+{
+    "name": "@slige/pat",
+    "exports": "./mod.ts",
+}

slige/compiler/pat/mod.ts

@@ -0,0 +1,2 @@
+export * as ctor from "./ctor.ts";
+export * from "./ctor.ts";

slige/compiler/program.slg

@@ -1,6 +1,10 @@
 
+struct A {
+    v: int,
+}
+
 fn main() {
-    for (let mut i = 0; i < 10; i = i + 1) {}
+    let a: A = A { v: 123 };
 }
 
 

slige/compiler/resolve/cx.ts

@@ -1,5 +1,5 @@
 import * as ast from "@slige/ast";
-import { AstId, IdBase, IdentId, IdMap, Res } from "@slige/common";
+import { AstId, IdentId, IdMap, Res } from "@slige/common";
 
 export interface Syms {
     getVal(ident: ast.Ident): Resolve;
@@ -16,7 +16,17 @@ export type Resolve = {
 
 export type ResolveKind =
     | { tag: "error" }
+    | { tag: "enum"; item: ast.Item; kind: ast.EnumItem }
+    | { tag: "struct"; item: ast.Item; kind: ast.StructItem }
     | { tag: "fn"; item: ast.Item; kind: ast.FnItem }
+    | {
+        tag: "variant";
+        item: ast.Item;
+        kind: ast.EnumItem;
+        variant: ast.Variant;
+        variantIdx: number;
+    }
+    | { tag: "field"; item: ast.Item; field: ast.FieldDef }
     | { tag: "local"; id: AstId };
 
 export type PatResolve = {
@@ -127,6 +137,31 @@ export class FnSyms implements Syms {
     }
 }
 
+export class ItemSyms implements Syms {
+    private syms = new SymsNsTab();
+
+    public constructor(
+        private parent: Syms,
+    ) {}
+
+    getVal(ident: ast.Ident): Resolve {
+        const res = this.syms.getVal(ident) || this.parent.getVal(ident);
+        if (res.kind.tag === "local") {
+            return ResolveError(ident);
+        }
+        return res;
+    }
+    getTy(ident: ast.Ident): Resolve {
+        return this.syms.getTy(ident) || this.parent.getTy(ident);
+    }
+    defVal(ident: ast.Ident, kind: ResolveKind): Res<void, Redef> {
+        return this.syms.defVal(ident, kind);
+    }
+    defTy(ident: ast.Ident, kind: ResolveKind): Res<void, Redef> {
+        return this.syms.defTy(ident, kind);
+    }
+}
+
 export class LocalSyms implements Syms {
     private syms = new SymsNsTab();
 

slige/compiler/resolve/resolver.ts

@@ -12,6 +12,7 @@ import {
 } from "@slige/common";
 import {
     FnSyms,
+    ItemSyms,
     LocalSyms,
     LoopBreakResolve,
     LoopResolve,
@@ -27,6 +28,8 @@ import {
 export class Resols {
     public constructor(
         private exprResols: IdMap<AstId, Resolve>,
+        private tyResols: IdMap<AstId, Resolve>,
+        private pathResols: IdMap<AstId, Resolve>,
         private patResols: IdMap<AstId, PatResolve>,
         private loopsResols: IdMap<AstId, LoopResolve>,
         private loopBreakResols: IdMap<AstId, LoopBreakResolve[]>,
@@ -39,6 +42,20 @@ export class Resols {
         return this.exprResols.get(id)!;
     }
 
+    public tyRes(id: AstId): Resolve {
+        if (!this.tyResols.has(id)) {
+            throw new Error();
+        }
+        return this.tyResols.get(id)!;
+    }
+
+    public pathRes(id: AstId): Resolve {
+        if (!this.pathResols.has(id)) {
+            throw new Error();
+        }
+        return this.pathResols.get(id)!;
+    }
+
     public patRes(id: AstId): PatResolve {
         if (!this.patResols.has(id)) {
             throw new Error();
@@ -67,6 +84,8 @@ export class Resolver implements ast.Visitor {
     private syms: Syms = this.rootSyms;
 
     private exprResols = new IdMap<AstId, Resolve>();
+    private tyResols = new IdMap<AstId, Resolve>();
+    private pathResols = new IdMap<AstId, Resolve>();
 
     private patResols = new IdMap<AstId, PatResolve>();
     private patResolveStack: PatResolveKind[] = [];
@@ -84,6 +103,8 @@ export class Resolver implements ast.Visitor {
         ast.visitFile(this, this.entryFileAst);
         return new Resols(
             this.exprResols,
+            this.tyResols,
+            this.pathResols,
             this.patResols,
             this.loopsResols,
             this.loopBreakResols,
@@ -145,11 +166,33 @@ export class Resolver implements ast.Visitor {
     }
 
     visitEnumItem(item: ast.Item, kind: ast.EnumItem): ast.VisitRes {
-        todo();
+        this.syms.defTy(item.ident, { tag: "enum", item, kind });
+        const outerSyms = this.syms;
+        this.syms = new ItemSyms(this.syms);
+        for (const variant of kind.variants) {
+            ast.visitVariant(this, variant);
+        }
+        this.syms = outerSyms;
+        return "stop";
     }
 
     visitStructItem(item: ast.Item, kind: ast.StructItem): ast.VisitRes {
-        todo();
+        this.syms.defTy(item.ident, { tag: "struct", item, kind });
+        const outerSyms = this.syms;
+        this.syms = new ItemSyms(this.syms);
+        ast.visitVariantData(this, kind.data);
+        this.syms = outerSyms;
+        return "stop";
+    }
+
+    visitVariant(variant: ast.Variant): ast.VisitRes {
+        ast.visitVariantData(this, variant.data);
+        return "stop";
+    }
+
+    visitFieldDef(field: ast.FieldDef): ast.VisitRes {
+        ast.visitTy(this, field.ty);
+        return "stop";
     }
 
     private fnBodiesToCheck: [ast.Item, ast.FnItem][][] = [];
@@ -160,6 +203,14 @@ export class Resolver implements ast.Visitor {
         return "stop";
     }
 
+    visitUseItem(item: ast.Item, kind: ast.UseItem): ast.VisitRes {
+        todo();
+    }
+
+    visitTypeAliasItem(item: ast.Item, kind: ast.TypeAliasItem): ast.VisitRes {
+        todo();
+    }
+
     private popAndVisitFnBodies() {
         for (const [item, kind] of this.fnBodiesToCheck.at(-1)!) {
             const outerSyms = this.syms;
@@ -182,41 +233,20 @@ export class Resolver implements ast.Visitor {
     }
 
     visitPathExpr(expr: ast.Expr, kind: ast.PathExpr): ast.VisitRes {
-        if (kind.path.segments.length === 1) {
+        if (kind.qty) {
-            const res = this.syms.getVal(kind.path.segments[0].ident);
+            return todo();
-            switch (res.kind.tag) {
+        }
-                case "error":
+        const res = this.resolveValPath(kind.path);
-                    return "stop";
-                case "fn":
-                    this.exprResols.set(expr.id, res);
-                    return "stop";
-                case "local":
         this.exprResols.set(expr.id, res);
         return "stop";
     }
-            exhausted(res.kind);
-        }
-        const pathRes = this.resolveInnerPath(kind.path);
-        switch (pathRes.kind.tag) {
-            case "error":
-                todo();
-                return "stop";
-            case "fn":
-                todo();
-                return "stop";
-            case "local":
-                todo();
-                return "stop";
-        }
-        exhausted(pathRes.kind);
-    }
 
-    visitUseItem(item: ast.Item, kind: ast.UseItem): ast.VisitRes {
+    visitStructExpr(expr: ast.Expr, kind: ast.StructExpr): ast.VisitRes {
-        todo();
+        if (!kind.path) {
+            return todo();
         }
-
+        this.resolveValPath(kind.path);
-    visitTypeAliasItem(item: ast.Item, kind: ast.TypeAliasItem): ast.VisitRes {
+        return "stop";
-        todo();
     }
 
     visitLoopExpr(expr: ast.Expr, kind: ast.LoopExpr): ast.VisitRes {
@@ -272,6 +302,15 @@ export class Resolver implements ast.Visitor {
         todo(pat, kind);
     }
 
+    visitPathTy(ty: ast.Ty, kind: ast.PathTy): ast.VisitRes {
+        if (kind.qty) {
+            return todo();
+        }
+        const res = this.resolveTyPath(kind.path);
+        this.tyResols.set(ty.id, res);
+        return "stop";
+    }
+
     visitPath(_path: ast.Path): ast.VisitRes {
         throw new Error("should not be reached");
     }
@@ -280,35 +319,80 @@ export class Resolver implements ast.Visitor {
         throw new Error("should not be reached");
     }
 
-    private resolveInnerPath(path: ast.Path): Resolve {
+    private resolveValPath(path: ast.Path): Resolve {
-        const res = path.segments.slice(1, path.segments.length)
+        let res: Resolve;
-            .reduce((innerRes, seg) => {
+        if (path.segments.length === 0) {
-                const k = innerRes.kind;
+            res = this.syms.getVal(path.segments[0].ident);
+        } else {
+            res = path.segments
+                .slice(1)
+                .reduce((inner, seg): Resolve => {
+                    const k = inner.kind;
                     switch (k.tag) {
                         case "error":
-                        return innerRes;
+                            return inner;
+                        case "enum":
+                            return this.resolveEnumVariant(k.item, k.kind, seg);
+                        case "struct":
                         case "fn":
-                        this.ctx.report({
+                        case "variant":
-                            severity: "error",
+                        case "field":
-                            file: this.currentFile,
-                            span: seg.ident.span,
-                            msg: "function, not pathable",
-                        });
-                        return ResolveError(seg.ident);
                         case "local":
-                        this.ctx.report({
+                            return todo();
-                            severity: "error",
-                            file: this.currentFile,
-                            span: seg.ident.span,
-                            msg: "local variable, not pathable",
-                        });
-                        return ResolveError(seg.ident);
                     }
-                exhausted(k);
+                    exhausted();
                 }, this.syms.getTy(path.segments[0].ident));
+        }
+        this.pathResols.set(path.id, res);
         return res;
     }
 
+    private resolveTyPath(path: ast.Path): Resolve {
+        const res = path.segments
+            .slice(1)
+            .reduce((inner, seg): Resolve => {
+                const k = inner.kind;
+                switch (k.tag) {
+                    case "error":
+                        return inner;
+                    case "enum":
+                        return this.resolveEnumVariant(k.item, k.kind, seg);
+                    case "struct":
+                    case "fn":
+                    case "variant":
+                    case "field":
+                    case "local":
+                        return todo();
+                }
+                exhausted();
+            }, this.syms.getTy(path.segments[0].ident));
+        this.pathResols.set(path.id, res);
+        return res;
+    }
+
+    private resolveEnumVariant(
+        item: ast.Item,
+        kind: ast.EnumItem,
+        seg: ast.PathSegment,
+    ): Resolve {
+        const { ident } = seg;
+        const found = kind.variants
+            .map((v, idx) => [v, idx] as const)
+            .find(([variant]) => variant.ident.id === ident.id);
+        if (!found) {
+            this.report(
+                `enum ${item.ident.text} has no member '${ident.text}'`,
+                seg.span,
+            );
+            return ResolveError(ident);
+        }
+        const [variant, variantIdx] = found;
+        return {
+            ident,
+            kind: { tag: "variant", item, kind, variant, variantIdx },
+        };
+    }
+
     private report(msg: string, span: Span) {
         this.ctx.report({
             severity: "error",

slige/compiler/stringify/hir.ts

@@ -59,7 +59,9 @@ export class HirStringifyer {
             case "enum":
                 return todo();
             case "struct":
-                return todo();
+                return `struct ${ident}: ${
+                    this.ty(this.ch.structItemTy(item, k))
+                };`;
             case "fn": {
                 const ty = this.ch.fnItemTy(item, k);
                 if (ty.kind.tag !== "fn") {
@@ -98,7 +100,19 @@ export class HirStringifyer {
             case "group":
             case "array":
             case "repeat":
+                return todo(k.tag);
             case "struct":
+                return `${k.path ? `${this.path(k.path)}` : "struct "} {${
+                    [
+                        k.fields
+                            .map((field) =>
+                                `${indent(d + 1)}${field.ident.text}: ${
+                                    this.expr(field.expr, d + 1)
+                                },`
+                            )
+                            .join("\n"),
+                    ].map((s) => `\n${s}\n${indent(d)}`)
+                }}`;
             case "ref":
             case "deref":
             case "elem":

slige/compiler/ty/to_string.ts

@@ -1,5 +1,5 @@
 import { Ctx, exhausted } from "@slige/common";
-import { Ty } from "./ty.ts";
+import { Ty, VariantData } from "./ty.ts";
 
 export function tyToString(ctx: Ctx, ty: Ty): string {
     const k = ty.kind;
@@ -22,6 +22,10 @@ export function tyToString(ctx: Ctx, ty: Ty): string {
             const reTy = tyToString(ctx, k.returnTy);
             return `fn ${identText}(${params}) -> ${reTy}`;
         }
+        case "struct": {
+            const identText = ctx.identText(k.item.ident.id);
+            return identText;
+        }
     }
     exhausted(k);
 }

slige/compiler/ty/ty.ts

@@ -1,4 +1,5 @@
 import * as ast from "@slige/ast";
+import { IdentId } from "@slige/common";
 
 export type Ty = {
     kind: TyKind;
@@ -18,4 +19,27 @@ export type TyKind =
         kind: ast.FnItem;
         params: Ty[];
         returnTy: Ty;
+    }
+    | {
+        tag: "struct";
+        item: ast.Item;
+        kind: ast.StructItem;
+        data: VariantData;
     };
+
+export type VariantData =
+    | { tag: "error" }
+    | { tag: "unit" }
+    | { tag: "tuple"; elems: ElemDef[] }
+    | { tag: "struct"; fields: FieldDef[] };
+
+export type ElemDef = {
+    ty: Ty;
+    pub: boolean;
+};
+
+export type FieldDef = {
+    ident: IdentId;
+    ty: Ty;
+    pub: boolean;
+};