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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 | 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 6x 6x 6x 6x 6x 6x 1x 1x 1x 1x 1x 1x 1x 6x 6x 6x 349x 349x 349x 11x 11x 349x 6x 6x 6x 1x 1x 1x 1x 1x 1x 11x 11x 11x 11x 11x 11x 11x 11x 11x | import * as escodegen from "escodegen";
import * as espree from "espree";
import * as estraverse from "estraverse";
import * as fs from "fs/promises";
/**
* Transpile the input file and write the output to the output file.
* @param {string} inputFile
* @param {string} outputFile
*/
export async function transpile(inputFile, outputFile) {
let input = await fs.readFile(inputFile, 'utf-8')
const code = addLogging(input);
if (outputFile === undefined) {
console.log(code);
return;
}
await fs.writeFile(outputFile, code)
console.log('Output written to', outputFile);
}
/**
* Add logging to the input code.
* @param {string} code
* @returns {string} The code with logging added.
*/
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);
}
/**
* Add code to the beginning of a function.
* @param {object} node The function node.
* @returns {object} The node with code added.
*/
function addBeforeCode(node) {
const name = node.id ? node.id.name : '<anonymous function>';
const args = node.params.map( p => "${ "+ p.name +" }" );
const line = node.loc.start.line;
const beforeCode = "console.log(`Entering " +
name + "(" + args.join(', ') + ") at line " + line +"`);";
const beforeNodes = espree.parse(beforeCode, {ecmaVersion:6}).body;
node.body.body = beforeNodes.concat(node.body.body);
}
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