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Example of pegjs (PEG.js)
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| import peg from 'pegjs'; | |
| import pegSrc from './source.pegjs'; | |
| (() => { | |
| // Event handler | |
| const button = document.getElementById('button-parse'); | |
| button.addEventListener('click', (evt) => { | |
| const div = document.getElementById('div-output'); | |
| try { | |
| // Input | |
| const textarea = document.getElementById('textarea-source'); | |
| const source = textarea.value; | |
| // Parser | |
| const parser = peg.generate(pegSrc); | |
| const result = parser.parse(source.trim()); | |
| // DOM | |
| div.innerText = result; | |
| } catch (err) { | |
| div.innerText = err.message; | |
| } | |
| }); | |
| })(); | |
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| #!/bin/bash | |
| test -d src || mkdir src | |
| cp -v index.js *.pegjs template.html src | |
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| { | |
| "name": "pegjs-example-1", | |
| "version": "1.0.0", | |
| "description": "Example of pegjs", | |
| "main": "index.js", | |
| "scripts": { | |
| "webpack": "webpack", | |
| "start:dev": "webpack-serve ./webpack.config.js --no-reload", | |
| "test": "echo \"Error: no test specified\" && exit 1" | |
| }, | |
| "author": "[email protected]", | |
| "license": "ISC", | |
| "dependencies": { | |
| "pegjs": "^0.10.0" | |
| }, | |
| "devDependencies": { | |
| "@babel/core": "^7.0.0", | |
| "babel-loader": "^8.0.2", | |
| "babel-preset-env": "^1.7.0", | |
| "css-loader": "^1.0.0", | |
| "html-webpack-plugin": "^3.2.0", | |
| "raw-loader": "^0.5.1", | |
| "style-loader": "^0.23.0", | |
| "webpack": "^4.18.0", | |
| "webpack-cli": "^3.1.0", | |
| "webpack-serve": "^2.0.2" | |
| } | |
| } |
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| start | |
| = additive | |
| additive | |
| = left:multiplicative "+" right:additive { return left + right; } | |
| / multiplicative | |
| multiplicative | |
| = left:primary "*" right:multiplicative { return left * right; } | |
| / primary | |
| primary | |
| = integer | |
| / "(" additive:additive ")" { return additive; } | |
| integer "integer" | |
| = digits:[0-9]+ { return parseInt(digits.join(""), 10); } | |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <title>Example of pegjs (PEG.js)</title> | |
| </head> | |
| <body> | |
| <div> | |
| <form onsubmit="return false;"> | |
| <textarea id="textarea-source" rows="10" style="width: 100%"></textarea> | |
| <button id="button-parse">Parse</button> | |
| </form> | |
| </div> | |
| <div id="div-output"> | |
| </div> | |
| </body> | |
| </html> | |
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| const HtmlWebpackPlugin = require('html-webpack-plugin'); // Installed via npm | |
| const webpack = require('webpack'); // To access built-in plugins | |
| const path = require('path'); | |
| const paths = { | |
| src: path.join(__dirname, 'src'), | |
| dist: path.join(__dirname, 'dist'), | |
| public: path.join(__dirname, 'public') | |
| }; | |
| const HOST = process.env.HOST; | |
| module.exports = { | |
| mode: process.env.WEBPACK_SERVE ? 'development' : 'production', | |
| // Or pass it as a CLI argument: webpack --mode=production | |
| target: 'web', // Default | |
| entry: { | |
| main: path.join(paths.src, 'index.js') | |
| }, | |
| output: { | |
| path: path.resolve(paths.dist), | |
| filename: '[name].js', | |
| pathinfo: true | |
| }, | |
| module: { | |
| rules: [ | |
| { | |
| test: /\.(txt|md|pegjs)$/, | |
| use: 'raw-loader' | |
| }, | |
| { // webpack --module-bind 'css=style-loader!css-loader' | |
| test: /\.css$/, | |
| use: [ | |
| { loader: 'style-loader' }, | |
| { | |
| loader: 'css-loader', | |
| options: { | |
| modules: true // Enable CSS Modules | |
| } | |
| } | |
| ] | |
| }, | |
| { | |
| test: /\.(js|jsx)$/, | |
| include: paths.src, | |
| loader: require.resolve('babel-loader'), | |
| options: { | |
| babelrc: false, | |
| presets: ["env"], | |
| // This is a feature of `babel-loader` for webpack (not Babel itself). | |
| // It enables caching results in ./node_modules/.cache/babel-loader/ | |
| // directory for faster rebuilds. | |
| cacheDirectory: false | |
| }, | |
| } | |
| ] | |
| }, | |
| performance: { | |
| hints: "warning", | |
| maxEntrypointSize: 1000000, | |
| maxAssetSize: 1000000 | |
| }, | |
| devtool: "source-map", | |
| serve: { | |
| host: HOST, | |
| port: 3000, | |
| content: paths.dist, | |
| logLevel: 'debug' | |
| }, | |
| stats: "verbose", | |
| plugins: [ | |
| new HtmlWebpackPlugin({ | |
| filename: 'index.html', | |
| template: path.join(paths.src, 'template.html') | |
| }) | |
| ] | |
| }; | |
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