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

export function prettyPrintDiag(ctx: Ctx, diag: Diag) {
    const { severity, msg } = diag;
    const origin = diag.origin ? `${diag.origin}: ` : "";
    console.error(`${origin}${severity}: ${msg}`);
    if (diag.file && (diag.span || diag.pos)) {
        const { absPath: path, text } = ctx.fileInfo(diag.file);
        const { line, col } = diag.span?.begin ?? diag.pos!;
        console.error(`    at ./${path}:${line}:${col}`);
        if (diag.span) {
            let begin = diag.span.begin.idx;
            while (begin >= 0 && text[begin - 1] != "\n") {
                begin -= 1;
            }
            let end = diag.span.end.idx;
            while (end < text.length && text[end + 1] != "\n") {
                end += 1;
            }
        } else if (diag.pos) {
        }
    }
}