Created
February 2, 2018 11:14
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| const { includes, last, lowerCase, padStart } = require("lodash"); | |
| const babylon = require("babylon"); | |
| const generator = require("babel-generator").default; | |
| const t = require("babel-types"); | |
| const traverse = require("babel-traverse").default; | |
| const fs = require("fs"); | |
| const path = require("path"); | |
| const prettier = require("prettier"); | |
| // Usage: t-extractor [options] [filename] | |
| const argv = require("minimist")(process.argv.slice(2), { | |
| default: { | |
| write: false, | |
| keyPrefix: "extracted" | |
| } | |
| }); | |
| console.info(argv); | |
| const fileName = last(argv._); | |
| if (!fileName) { | |
| console.error("Please provide a file"); | |
| process.exit(1); | |
| } | |
| const code = fs.readFileSync(path.join(__dirname, "..", fileName)).toString(); | |
| const ast = babylon.parse(code, { | |
| sourceType: "module", | |
| plugins: ["jsx", "classProperties", "objectRestSpread"] | |
| }); | |
| const translations = {}; | |
| function* keyGenerator() { | |
| let n = 0; | |
| while (true) { | |
| n = n + 1; | |
| yield `extracted_${padStart(n, 3, "0")}`; | |
| } | |
| } | |
| const keyIterator = keyGenerator(); | |
| const pushTranslation = text => { | |
| const key = [ | |
| argv.keyPrefix, | |
| keyIterator.next().value, | |
| lowerCase(text) | |
| .replace(/\s/gi, "_") | |
| .substr(0, 32) | |
| ].join(":"); | |
| translations[key] = text.trim(); | |
| return { key }; | |
| }; | |
| const tExpression = key => | |
| t.callExpression(t.identifier("t"), [t.stringLiteral(key)]); | |
| traverse(ast, { | |
| // Do nothing with translated strings `t("something")` | |
| CallExpression(path) { | |
| if (path.node.callee.name === "t") { | |
| path.skip(); | |
| } | |
| }, | |
| // Do nothing with import statements | |
| ImportDeclaration(path) { | |
| path.skip(); | |
| }, | |
| // TODO(lucassus): template literals are quite completed :/ | |
| TemplateLiteral(path) { | |
| path.skip(); | |
| }, | |
| StringLiteral(path) { | |
| const { key } = pushTranslation(path.node.value); | |
| if (t.isJSXAttribute(path.parent)) { | |
| path.replaceWith(t.jSXExpressionContainer(tExpression(key))); | |
| } | |
| if (t.isStringLiteral(path)) { | |
| // Do not translate property's keys | |
| if (t.isObjectProperty(path.parent) && path.parent.key === path.node) { | |
| return; | |
| } | |
| path.replaceWith(tExpression(key)); | |
| } | |
| }, | |
| JSXElement(path) { | |
| const tags = ["svg"]; | |
| if (includes(tags, path.node.openingElement.name.name)) { | |
| path.skip(); | |
| } | |
| }, | |
| // Do not translate JSX `className` attributes | |
| JSXAttribute(path) { | |
| const attrs = ["className", "id", "type"]; | |
| if (includes(attrs, path.node.name.name)) { | |
| path.skip(); | |
| } | |
| }, | |
| // Strings inside JSX tags | |
| JSXText(path) { | |
| const { value } = path.node; | |
| // Skip empty nodes | |
| if (value.trim() === "") { | |
| return; | |
| } | |
| const { key } = pushTranslation(value); | |
| path.replaceWith(t.jSXExpressionContainer(tExpression(key))); | |
| } | |
| }); | |
| const generatedCode = prettier.format(generator(ast).code); | |
| if (argv.write) { | |
| fs.writeFileSync(fileName, generatedCode); | |
| } else { | |
| console.info(generatedCode); | |
| } | |
| console.info(translations); |
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