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import { Token, Parse, TokenType, ASTNode, NodeType } from "../../ts-lang";
import { lex } from "./lexer";
const resolveNodeFromToken = (token: Token): ASTNode => {
// FIXME not correct
if (!isNaN(Number(token.name))) {
return {
type: NodeType.INT,
name: "",
value: Number(token.name),
children: [],
};
}
if (token.name[0] === '"' && token.name[token.name.length - 1] === '"') {
return {
type: NodeType.INT,
name: "",
value: token.name.slice(1, token.name.length - 1),
children: [],
};
}
return {
type: NodeType.EXT,
name: token.name,
value: null,
children: [],
};
};
const _parse = ({
remainingTokens,
lastToken,
stack,
}: {
remainingTokens: Token[];
lastToken: Token | null;
stack: ASTNode[];
}): ASTNode | null => {
const head = remainingTokens.shift();
if (!head) {
if (lastToken) {
(stack[stack.length - 1].children as ASTNode[]).push(
resolveNodeFromToken(lastToken)
);
return _parse({
lastToken: null,
remainingTokens: [],
stack,
});
}
return stack[0] ?? null;
}
if (lastToken) {
if (head.type === TokenType.NAME) {
(stack[stack.length - 1].children as ASTNode[]).push(
resolveNodeFromToken(lastToken)
);
return _parse({
lastToken: head,
remainingTokens,
stack,
});
}
if (head.type === TokenType.CLOSE_PAREN) {
const top = stack.pop()!;
(top.children as ASTNode[]).push(resolveNodeFromToken(lastToken));
(stack[stack.length - 1].children as ASTNode[]).push(top);
return _parse({
lastToken: null,
remainingTokens,
stack,
});
}
if (head.type === TokenType.OPEN_PAREN) {
return _parse({
lastToken: null,
remainingTokens,
stack: [...stack, resolveNodeFromToken(lastToken)],
});
}
throw new Error(
`${JSON.stringify({
lastToken,
remainingTokens,
stack,
})} Was not expecting ${head.type}`
);
}
if (head.type === TokenType.NAME) {
return _parse({
lastToken: head,
remainingTokens,
stack,
});
}
if (head.type === TokenType.CLOSE_PAREN) {
const top = stack.pop()!;
(stack[stack.length - 1].children as ASTNode[]).push(top);
return _parse({
lastToken: null,
remainingTokens,
stack,
});
}
throw new Error(
`${JSON.stringify({
lastToken,
remainingTokens,
stack,
})} Expected nextToken to be a name or close paren at ${head.type}`
);
};
export const parse = <const Raw extends readonly Token[]>(
raw: Raw
): Parse<Raw> =>
_parse({
remainingTokens: raw as unknown as Token[],
lastToken: null,
stack: [{ type: NodeType.EXT, name: "arr", value: null, children: [] }],
}) as Parse<Raw>;
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