parjs/dist/internal/trace-visualizer.js

Library for building parsers using combinators.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.visualizeTrace = void 0;
const utils_1 = require("../utils");
const functions_1 = require("./functions");
const defaultArgs = {
    lineNumbers: true,
    linesBefore: 1
};
function newTraceVisualizer(pAgs) {
    const args = (0, utils_1.defaults)(pAgs, defaultArgs);
    const visualizer = (trace) => {
        const rows = trace.input.split(/\r\n|\n|\r/g);
        const locRow = trace.location.line;
        const around = args.linesBefore;
        const firstRow = Math.max(0, locRow - around);
        let linesAround = rows.slice(firstRow, locRow + 1);
        let prefixLength = 0;
        if (args.lineNumbers) {
            const numLength = Math.floor(1 + Math.log(locRow + 1) / Math.log(10));
            const rowNumberPrefixer = (n) => `${(0, functions_1.padInt)(firstRow + n, numLength, " ")} | `;
            prefixLength = numLength + 3;
            linesAround = linesAround.map((row, i) => `${rowNumberPrefixer(i + 1)}${row}`);
        }
        const errorMarked = `${" ".repeat(prefixLength + trace.location.column)}^${trace.reason}`;
        linesAround.push(errorMarked);
        const linesVisualization = linesAround.join("\n");
        const stack = trace.stackTrace
            .map(x => {
            const base = x;
            return `${base.expecting} (${x.type})`;
        })
            .filter(x => x)
            .join("\n");
        const fullVisualization = `${trace.kind} failure at Ln ${trace.location.line + 1} Col ${trace.location.column + 1}
${linesVisualization}

Stack:
${stack}
`;
        return fullVisualization;
    };
    visualizer.configure = newTraceVisualizer;
    return visualizer;
}
/** Visualizes a Parjs failure. */
exports.visualizeTrace = newTraceVisualizer(defaultArgs);
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