Uncaught Error: Module name "antlr4/index" has not been loaded yet for context on require.js

Question

我尝试在 javascript 上使用 antlr4，然后阅读 https://tomassetti.me/antlr-and-the-web/ 并进行编译，但出现错误。

index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script type="text/javascript" src="lib/require.js"></script>
    <script type="text/javascript">
        var antlr4 = require('antlr4/index');
        var QueryLexer = require('gram/queryLexer');
        var QueryParser = require('gram/queryParser');
        document.getElementById("parse").addEventListener("click", function() {
            var input = document.getElementById("code").value;
            var chars = new antlr4.InputStream(input);
            var lexer = new QueryLexer.queryLexer(chars);
            var tokens = new antlr4.CommonTokenStream(lexer);
            var parser = new QueryParser.queryParser(tokens);
            parser.buildParseTrees = true;
            var tree = parser.query();
            console.log("Parsed: "+ tree);
        });
    </script>
</head>
<body>
<div id="inputs">
<textarea id="code">
* play with antlr4
* write a tutorial
</textarea>
    <br/>
    <button id="parse">Parse</button>
</div>
</body>
</html>

错误可能会在 "var antlr4 = require('antlr4/index');" 上引起。我从 http://www.antlr.org/download/index.html 下载了 antlr4 并放置了 "index.html" 的同一层。在 lib 目录中存在 "require.js".

index.js

exports.atn = require('./atn/index');
exports.codepointat = require('./polyfills/codepointat');
exports.dfa = require('./dfa/index');
exports.fromcodepoint = require('./polyfills/fromcodepoint');
exports.tree = require('./tree/index');
exports.error = require('./error/index');
exports.Token = require('./Token').Token;
exports.CharStreams = require('./CharStreams').CharStreams;
exports.CommonToken = require('./Token').CommonToken;
exports.InputStream = require('./InputStream').InputStream;
exports.FileStream = require('./FileStream').FileStream;
exports.CommonTokenStream = require('./CommonTokenStream').CommonTokenStream;
exports.Lexer = require('./Lexer').Lexer;
exports.Parser = require('./Parser').Parser;
var pc = require('./PredictionContext');
exports.PredictionContextCache = pc.PredictionContextCache;
exports.ParserRuleContext = require('./ParserRuleContext').ParserRuleContext;
exports.Interval = require('./IntervalSet').Interval;
exports.Utils = require('./Utils');

我觉得没有问题，因为require path('antlr4/index')没有错。但是发生了错误。请给我一些想法。

Answer 1

您在问题中显示的代码不能按原样使用 RequireJS。您必须以不同的方式编写 require 调用，或者将所有 require 调用包装在 define 中，以便使用 RequireJS 提供的 CommonJS support。

但是本教程并未要求您使用 RequireJS。如果你去教程作者提供的github repo，你会看到：

Require.js was obtained from https://github.com/letorbi/smoothie/blob/master/standalone/require.js

你必须使用那个文件，它不是 RequireJS，但在它加载脚本的意义上类似于它，但在它似乎支持 CommonJS 模块格式的意义上与 RequireJS 不同——是，而 RequireJS 没有。

Uncaught Error: Module name "antlr4/index" has not been loaded yet for context on require.js

Uncaught Error: Module name "antlr4/index" has not been loaded yet for context on require.js

javascript

requirejs

antlr4