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pug-walk

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pug-walk

Walk and transform a pug AST

  • 2.0.0
  • unpublished
  • latest
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  • npm
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1.2M
decreased by-27.28%
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3
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What is pug-walk?

The pug-walk npm package is designed for walking through the abstract syntax tree (AST) of Pug templates. It allows developers to traverse and manipulate nodes in the AST, enabling operations such as modification, filtering, and analysis of Pug templates.

What are pug-walk's main functionalities?

Walking the AST

This example demonstrates how to traverse a Pug template's AST to find all `div` tags and add an `id` attribute to them. The `walk` function takes the AST and a callback function that is applied to every node. If the node matches the criteria (a `div` tag in this case), a new attribute is added.

const pug = require('pug');
const pugWalk = require('pug-walk');

const ast = pug.parser.parse('div(class=classes)');
pugWalk.walk(ast, (node, replace) => {
  if (node.type === 'Tag' && node.name === 'div') {
    node.attrs.push({
      name: 'id',
      val: '"dynamic-id"',
      mustEscape: false
    });
    replace(node);
  }
});

Filtering Nodes

This code snippet shows how to filter nodes of a specific type, in this case, `Conditional` nodes, from a Pug template's AST. The `walk` function is used to traverse the AST, and nodes that match the specified condition are added to an array for further processing.

const pug = require('pug');
const pugWalk = require('pug-walk');

const ast = pug.parser.parse('div
  if condition
    p True
  else
    p False');
const filteredNodes = [];
pugWalk.walk(ast, node => {
  if (node.type === 'Conditional') {
    filteredNodes.push(node);
  }
}, {includeDependencies: true});

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Package last updated on 25 May 2020

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