@ima/dev-utils/dist/sourceFragment.js

IMA.js dev utils used used mainly in @ima/cli and other dev-related utilities.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.createSourceFragment = void 0;
/**
 * Create fragment of code lines around input line (above and below), created
 * created from provided source code.
 *
 * @param {number} line Source code line number, around which
 *        you want to created source fragment.
 * @param {string} source Source file's source code.
 * @param {number} [contextLines=4] Number of lines to generate,
 *        below and after watched line.
 * @returns {FragmentLine[]} Array of source code lines.
 */
function createSourceFragment(line, source, contextLines = 4) {
    const lines = source.split('\n');
    const startLine = Math.max(0, line - contextLines - 1);
    const endLine = Math.min(lines.length, line + contextLines);
    const fragmentLines = [];
    /**
     * Lines are numbered from 1 up, but indexes are from 0 up,
     * so we need to adjust line number and highlighted line accordingly.
     */
    for (let i = startLine; i < endLine; i++) {
        fragmentLines.push({
            line: (i + 1).toString(),
            source: lines[i],
            highlight: i === line - 1,
        });
    }
    // Adjust line paddings
    const endLineWidth = fragmentLines[fragmentLines.length - 1].line.length;
    fragmentLines.forEach(fragmentLine => {
        fragmentLine.line = fragmentLine.line.padStart(endLineWidth, ' ');
    });
    return fragmentLines;
}
exports.createSourceFragment = createSourceFragment;