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nora 2023-07-26 13:20:32 +02:00
parent 8b424c0add
commit 87f081a4fe
5 changed files with 33 additions and 25 deletions
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18
src/ast.ts
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@ -20,9 +20,10 @@ export type Item = ItemKind & {
export type FunctionDef = {
name: string;
args: FunctionArg[];
params: FunctionArg[];
body: Expr;
returnType?: Type;
ty?: TyFn;
};
export type FunctionArg = {
@ -253,6 +254,11 @@ export function tyIsUnit(ty: Ty): ty is TyUnit {
return ty.kind === "tuple" && ty.elems.length === 0;
}
export const TY_UNIT: Ty = { kind: "tuple", elems: [] };
export const TY_STRING: Ty = { kind: "string" };
export const TY_BOOL: Ty = { kind: "bool" };
export const TY_INT: Ty = { kind: "int" };
// folders
export type FoldFn<T> = (value: T) => T;
@ -279,14 +285,14 @@ export const DEFAULT_FOLDER: Folder = {
},
};
export function fold_ast(ast: Ast, folder: Folder): Ast {
export function foldAst(ast: Ast, folder: Folder): Ast {
return ast.map((item) => folder.item(item));
}
export function superFoldItem(item: Item, folder: Folder): Item {
switch (item.kind) {
case "function": {
const args = item.node.args.map(({ name, type, span }) => ({
const args = item.node.params.map(({ name, type, span }) => ({
name,
type: folder.type(type),
span,
@ -297,7 +303,7 @@ export function superFoldItem(item: Item, folder: Folder): Item {
span: item.span,
node: {
name: item.node.name,
args,
params: args,
body: folder.expr(item.node.body),
returnType: item.node.returnType && folder.type(item.node.returnType),
},
@ -399,3 +405,7 @@ export function superFoldType(type: Type, folder: Folder): Type {
}
}
}
export function varUnreachable(): never {
throw new Error("Type variables must not occur after type checking");
}