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.then(spec =\u003e estree.createVisitor(spec, []/*exceptions*/, \"MyVisitor\"))\n  .catch(console.error)\n```\n\n### Visitors\n\nCreation of visitor:\n\n```js\nvar visitor;\nvisitorSource\n  .then(source =\u003e eval(source + \"\\n\" + \"MyVisitor\"))\n  .then(MyVisitor =\u003e visitor = new MyVisitor());\n```\n\n#### Print path example\n\nvisitors have an `accept(node, state, path)` method and visitNodeType methods\nlike `visitVariableDeclaration(node, state, path)`. You can customize it to\nyour needs, for example:\n\n```js\nvar lang = require(\"lively.lang\"), ast = require(\"lively.ast\");\nvisitor.accept = lang.fun.wrap(visitor.accept, (proceed, node, state, path) =\u003e {\n  state.push(path.join(\".\") + \" - \" + node.type);\n  proceed(node, state, path);\n});\nvar state = [];\nvisitor.accept(ast.parse(\"var x = 1+3\"), state, []);\nconsole.log(state.join(\"\\n\")); // =\u003e\n                               //   - Program\n                               //   body.0 - VariableDeclaration\n                               //   body.0.declarations.0 - VariableDeclarator\n                               //   ...\n```\n\n#### Rewriting example\n\n```js\nvar replacer = (node) =\u003e lang.obj.merge(node, {id: {type: \"Identifier\", name: \"foo_\" + node.id.name}})\nvar visitor = new MyVisitor();\nvisitor.accept = lang.fun.wrap(visitor.accept, (proceed, node, state, path) =\u003e {\n  if (node.type === \"VariableDeclarator\") node = replacer(node);\n  return proceed(node, state, path);\n});\nvar rewritten = visitor.accept(ast.parse(\"var x = 1 + 3\"), null, []);\nast.stringify(rewritten); // =\u003e var foo_x = 1 + 3;\n```\n\n## command line\n\n    --out\t\t\tfile output file to write\n    --generate-json-spec\tfetch and parse markdown source and generate JSON spec from it (default)\n    --generate-visitor\tgenerate source code for AST visitor class\n    --json-spec\t\tfile to json spec. If specified it is used instead of fetching + parsing\n\n### Examples:\n\n- `./bin/estree-to-js.js es6` prints JSON spec of es6 estree\n- `./bin/estree-to-js.js es6 --generate-visitor` prints JS source es6 estree visitor class\n\n# License\n\n[MIT](LICENSE)\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Frksm%2Festree-to-js","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Frksm%2Festree-to-js","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Frksm%2Festree-to-js/lists"}