"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = collectDependencies;

function _posthtml() {
  const data = _interopRequireDefault(require("posthtml"));

  _posthtml = function () {
    return data;
  };

  return data;
}

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

// A list of all attributes that may produce a dependency
// Based on https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes
const ATTRS = {
  src: ['script', 'img', 'audio', 'video', 'source', 'track', 'iframe', 'embed', 'amp-img'],
  // Using href with <script> is described here: https://developer.mozilla.org/en-US/docs/Web/SVG/Element/script
  href: ['link', 'a', 'use', 'script'],
  srcset: ['img', 'source'],
  imagesrcset: ['link'],
  poster: ['video'],
  'xlink:href': ['use', 'image', 'script'],
  content: ['meta'],
  data: ['object']
}; // A list of metadata that should produce a dependency
// Based on:
// - http://schema.org/
// - http://ogp.me
// - https://developer.twitter.com/en/docs/tweets/optimize-with-cards/overview/markup
// - https://msdn.microsoft.com/en-us/library/dn255024.aspx
// - https://vk.com/dev/publications

const META = {
  property: ['og:image', 'og:image:url', 'og:image:secure_url', 'og:audio', 'og:audio:secure_url', 'og:video', 'og:video:secure_url', 'vk:image'],
  name: ['twitter:image', 'msapplication-square150x150logo', 'msapplication-square310x310logo', 'msapplication-square70x70logo', 'msapplication-wide310x150logo', 'msapplication-TileImage', 'msapplication-config'],
  itemprop: ['image', 'logo', 'screenshot', 'thumbnailUrl', 'contentUrl', 'downloadUrl']
};
const FEED_TYPES = new Set(['application/rss+xml', 'application/atom+xml']); // Options to be passed to `addDependency` for certain tags + attributes

const OPTIONS = {
  a: {
    href: {
      needsStableName: true
    }
  },
  iframe: {
    src: {
      needsStableName: true
    }
  },

  link(attrs) {
    if (attrs.rel === 'stylesheet') {
      return {
        // Keep in the same bundle group as the HTML.
        priority: 'parallel'
      };
    }
  }

};

function collectSrcSetDependencies(asset, srcset, opts) {
  let newSources = [];

  for (const source of srcset.split(',')) {
    let pair = source.trim().split(' ');

    if (pair.length === 0) {
      continue;
    }

    pair[0] = asset.addURLDependency(pair[0], opts);
    newSources.push(pair.join(' '));
  }

  return newSources.join(',');
}

function getAttrDepHandler(attr) {
  if (attr === 'srcset' || attr === 'imagesrcset') {
    return collectSrcSetDependencies;
  }

  return (asset, src, opts) => asset.addURLDependency(src, opts);
}

function collectDependencies(asset, ast) {
  let isDirty = false;
  let hasScripts = false;
  let seen = new Set();
  (0, _posthtml().default)().walk.call(ast.program, node => {
    let {
      tag,
      attrs
    } = node;

    if (!attrs || seen.has(node)) {
      return node;
    }

    seen.add(node);

    if (tag === 'meta') {
      const isMetaDependency = Object.keys(attrs).some(attr => {
        let values = META[attr];
        return values && values.includes(attrs[attr]) && attrs.content !== '' && !(attrs.name === 'msapplication-config' && attrs.content === 'none');
      });

      if (isMetaDependency) {
        const metaAssetUrl = attrs.content;

        if (metaAssetUrl) {
          attrs.content = asset.addURLDependency(attrs.content, {
            needsStableName: true
          });
          isDirty = true;
          asset.setAST(ast);
        }
      }

      return node;
    }

    if (tag === 'link' && (attrs.rel === 'canonical' || attrs.rel === 'manifest' || attrs.rel === 'alternate' && FEED_TYPES.has(attrs.type)) && attrs.href) {
      let href = attrs.href;

      if (attrs.rel === 'manifest') {
        // A hack to allow manifest.json rather than manifest.webmanifest.
        // If a custom pipeline is used, it is responsible for running @parcel/transformer-webmanifest.
        if (!href.includes(':')) {
          href = 'webmanifest:' + href;
        }
      }

      attrs.href = asset.addURLDependency(href, {
        needsStableName: true
      });
      isDirty = true;
      asset.setAST(ast);
      return node;
    }

    if (tag === 'script' && attrs.src) {
      let sourceType = attrs.type === 'module' ? 'module' : 'script';
      let loc = node.location ? {
        filePath: asset.filePath,
        start: node.location.start,
        end: node.location.end
      } : undefined;
      let outputFormat = 'global';

      if (attrs.type === 'module' && asset.env.shouldScopeHoist) {
        outputFormat = 'esmodule';
      } else {
        if (attrs.type === 'module') {
          attrs.defer = '';
        }

        delete attrs.type;
      } // If this is a <script type="module">, and not all of the browser targets support ESM natively,
      // add a copy of the script tag with a nomodule attribute.


      let copy;

      if (outputFormat === 'esmodule' && !asset.env.supports('esmodules', true)) {
        let attrs = Object.assign({}, node.attrs);
        copy = { ...node,
          attrs
        };
        delete attrs.type;
        attrs.nomodule = '';
        attrs.defer = '';
        attrs.src = asset.addURLDependency(attrs.src, {
          // Keep in the same bundle group as the HTML.
          priority: 'parallel',
          bundleBehavior: sourceType === 'script' || attrs.async != null ? 'isolated' : undefined,
          env: {
            sourceType,
            outputFormat: 'global',
            loc
          }
        });
        seen.add(copy);
      }

      attrs.src = asset.addURLDependency(attrs.src, {
        // Keep in the same bundle group as the HTML.
        priority: 'parallel',
        // If the script is async it can be executed in any order, so it cannot depend
        // on any sibling scripts for dependencies. Keep all dependencies together.
        // Also, don't share dependencies between classic scripts and nomodule scripts
        // because nomodule scripts won't run when modules are supported.
        bundleBehavior: sourceType === 'script' || attrs.async != null ? 'isolated' : undefined,
        env: {
          sourceType,
          outputFormat,
          loc
        }
      });
      asset.setAST(ast);
      hasScripts = true;
      return copy ? [node, copy] : node;
    }

    for (let attr in attrs) {
      // Check for virtual paths
      if (tag === 'a' && attrs[attr].split('#')[0].lastIndexOf('.') < 1) {
        continue;
      } // Check for id references


      if (attrs[attr][0] === '#') {
        continue;
      }

      let elements = ATTRS[attr];

      if (elements && elements.includes(node.tag)) {
        let depHandler = getAttrDepHandler(attr);
        let depOptionsHandler = OPTIONS[node.tag];
        let depOptions = typeof depOptionsHandler === 'function' ? depOptionsHandler(attrs, asset.env) : depOptionsHandler && depOptionsHandler[attr];
        attrs[attr] = depHandler(asset, attrs[attr], depOptions);
        isDirty = true;
      }
    }

    if (isDirty) {
      asset.setAST(ast);
    }

    return node;
  });
  return hasScripts;
}