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implement field accesses

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This commit is contained in:
nora 2023-07-30 23:59:43 +02:00
parent 7f65dc0277
commit 2da011caf4
7 changed files with 224 additions and 96 deletions
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70
src/typeck.ts
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@ -677,6 +677,76 @@ export function checkBody(
return { ...expr, lhs, args, ty: lhsTy.returnTy };
}
case "fieldAccess": {
const lhs = this.expr(expr.lhs);
lhs.ty = infcx.resolveIfPossible(lhs.ty!);
const { field } = expr;
let ty: Ty;
let fieldIdx: number;
switch (lhs.ty.kind) {
case "tuple": {
const { elems } = lhs.ty;
if (typeof field.value === "number") {
if (elems.length > field.value) {
ty = elems[field.value];
fieldIdx = field.value;
} else {
throw new CompilerError(
`tuple with ${elems.length} elements cannot be indexed with ${field.value}`,
field.span
);
}
} else {
throw new CompilerError(
"tuple fields must be accessed with numbers",
field.span
);
}
break;
}
case "struct": {
if (typeof field.value === "string") {
const idx = lhs.ty.fields.findIndex(
([name]) => name === field.value
);
if (idx === -1) {
throw new CompilerError(
`field \`${field.value}\` does not exist on ${printTy(
lhs.ty
)}`,
field.span
);
}
ty = lhs.ty.fields[idx][1];
fieldIdx = idx;
} else {
throw new CompilerError(
"struct fields must be accessed with their name",
field.span
);
}
break;
}
default: {
throw new CompilerError(
"only tuples and structs have fields",
expr.span
);
}
}
return {
...expr,
lhs,
field: {
...expr.field,
fieldIdx,
},
ty,
};
}
case "if": {
const cond = this.expr(expr.cond);
const then = this.expr(expr.then);