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logging-espree.js
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logging-espree.js
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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'); // Usamos el formato utf-8 para que no nos de problemas con los caracteres especiales
let output = addLogging(input);
if (outputFile === undefined) {
console.log(output);
return;
}
await fs.writeFile(outputFile, output);
}
/**
* @description Adds logging statements at the beginning of any function.
*
* @param {string} code The code to process.
* @returns {string} The JavaScript code with logging statements added
*/
export function addLogging(code) {
const ast = espree.parse(code, { ecmaVersion: 2020, loc: true });
estraverse.traverse(ast, {
enter: function(node, _) {
if (/\w*Function\w*/.test(node.type)) addBeforeCode(node);
}
});
return escodegen.generate(ast);
}
/**
* @desc Recibe un nodo y le añade un console.log antes de la función, incluyendo el numero de linea y
*
* @param {*} node
*/
function addBeforeCode(node, lines) {
const name = node.id ? node.id.name : '<anonymous function>';
const parameters = node.params.map(param => `\$\{${param.name}\}`);
const beforeCode = "console.log(`Entering " + name + "(" + parameters + ") at line " + lines + "`);";
const beforeNodes = espree.parse(beforeCode, {ecmaVersion:6}).body;
node.body.body = beforeNodes.concat(node.body.body);
}