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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 | 1x 1x 1x 1x 1x 1x 1x 5x 5x 5x 5x 1x 1x 1x 1x 1x 1x 5x 5x 5x 13x 13x 5x 5x 13x 5x 5x 5x 1x 1x 1x 1x 1x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x | import * as escodegen from "escodegen";
import * as espree from "espree";
import * as estraverse from "estraverse";
import * as fs from "fs/promises";
export async function transpile(inputFile, outputFile) {
let input = await fs.readFile(inputFile, 'utf-8')
let output = addLogging(input);
if (outputFile === undefined) {
console.log(output);
return;
}
await fs.writeFile(outputFile, output);
}
/**
* @desc Adds logging to the input code.
* @param {string} code The code to add logging to.
*/
export function addLogging(code) {
const ast = espree.parse(code, { ecmaVersion: 6 }, { loc: true });
estraverse.traverse(ast, {
enter: function (node, parent) {
if (node.type === 'FunctionDeclaration' ||
node.type === 'FunctionExpression' || node.type === 'ArrowFunctionExpression') {
addBeforeCode(node);
}
}
});
return escodegen.generate(ast);
}
/**
* @desc Adds a console.log statement before the function
* @param {Object} node the function node
*/
function addBeforeCode(node) {
let name = node.id ? node.id.name : '<anonymous function>';
let lineNum = node.loc.start.line;
let params = node.params.map(function (argumentos) {
if (argumentos.type === 'Identifier') {
return argumentos.name;
}
else if (argumentos.type === 'AssignmentPattern') {
return argumentos.left.name + "=" + argumentos.right.name;
}
else if (argumentos.type === 'RestElement') {
return "..." + argumentos.argument.name;
}
});
params = params.join(', ');
let beforeCode = `console.log(\`Entering ${name}(${params}) at line ${lineNum}\`);`;
let beforeNodes = espree.parse(beforeCode, { ecmaVersion: 6 }).body;
node.body.body = beforeNodes.concat(node.body.body);
}
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