56 lines
1.6 KiB
TypeScript
56 lines
1.6 KiB
TypeScript
import { CheckedExpr, CheckedType } from "./checked.ts";
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import { ParsedExpr } from "./parsed.ts";
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import { CompileError } from "./token.ts";
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export type SymbolValue = {
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id: number;
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subject: string;
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valueType: CheckedType;
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};
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export class SymbolTable {
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private idCounter = 0;
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private symbols: { [key: string]: SymbolValue } = {};
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public define(subject: string, valueType: CheckedType) {
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if (subject in this.symbols) {
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throw new Error("redefinition not implemented");
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}
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const id = this.idCounter;
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this.idCounter++;
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this.symbols[subject] = { id, subject, valueType };
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}
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}
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export class Checker {
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private symbolTable = new SymbolTable();
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public errors: CompileError[] = [];
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public check(statements: ParsedExpr[]): CheckedExpr[] {
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return statements as CheckedExpr[];
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}
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private searchTopLevelStatements(statements: ParsedExpr[]) {
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for (const statement of statements) {
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switch (statement.exprType) {
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case "fn":
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this.searchTopLevelFn(statement);
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break;
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case "let":
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break;
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default:
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this.errors.push({
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pos: statement.pos,
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message:
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`statement '${statement.exprType}' not supported in top level`,
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});
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break;
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}
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}
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}
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private searchTopLevelFn(statement: ParsedExpr & { exprType: "fn" }) {
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}
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}
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