slige/compiler/diagnostics.ts

import { Ctx, File } from "./ctx.ts";

export type Span = {
    begin: Pos;
    end: Pos;
};

export type Pos = {
    idx: number;
    line: number;
    col: number;
};

export type Report = {
    severity: "fatal" | "error" | "warning" | "info";
    origin?: string;
    msg: string;
    file?: File;
    span?: Span;
    pos?: Pos;
};

export function prettyPrintReport(ctx: Ctx, rep: Report) {
    const { severity, msg } = rep;
    const origin = rep.origin ? `${rep.origin}: ` : "";
    console.error(`${origin}${severity}: ${msg}`);
    if (rep.file && (rep.span || rep.pos)) {
        const { absPath: path } = ctx.fileInfo(rep.file);
        const { line, col } = rep.span?.begin ?? rep.pos!;
        console.error(`    at ./${path}:${line}:${col}`);
    }
}

export function printStackTrace() {
    class StackTracer extends Error {
        constructor() {
            super("StackTracer");
        }
    }
    try {
        throw new StackTracer();
    } catch (error) {
        if (!(error instanceof StackTracer)) {
            throw error;
        }
        console.log(
            error.stack?.replace(
                "Error: StackTracer",
                "Stack trace:",
            ) ??
                error,
        );
    }
}