# All files / lib/util parse.js

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     // Adapted implementation from:
    // https://github.com/ashi009/node-fast-html-parser

    import createTree from '../tree/create';
    import getConfig from './config';
    import process from './process';
    import { VTree, Supplemental, TransactionConfig, ParserConfig, EMPTY, NODE_TYPE } from './types';

    // Magic token used for interpolation.
    export const TOKEN = '__DIFFHTML__';

    const doctypeEx = /<!DOCTYPE.*>/i;
    const spaceEx = /[^ ]/;
    const tokenEx = new RegExp(`${TOKEN}([^_]*)__`);

    /** @type {Supplemental} */
    const defaultSupplemental = {
      tags: [],
      attributes: {},
      children: {},
    }

    const { assign } = Object;
    const { isArray } = Array;

    const rawElementsDefaults = [
      'script',
      'noscript',
      'style',
      'template',
    ];

    const selfClosingElementsDefaults = [
      'source',
      'embed',
      'param',
      'track',
      'input',
      'meta',
      'link',
      'area',
      'base',
      'col',
      'wbr',
      'img',
      'br',
      'hr',
    ];

    /** @type {any} */
    const kElementsClosedByOpening = {
      li: { li: true },
      p: { p: true, div: true },
      td: { td: true, th: true },
      th: { td: true, th: true },
    };

    /** @type {any} */
    const kElementsClosedByClosing = {
      li: { ul: true, ol: true },
      a: { div: true },
      b: { div: true },
      i: { div: true },
      p: { div: true },
      td: { tr: true, table: true },
      th: { tr: true, table: true },
    };

    /**
     * Interpolates children from dynamic supplemental values into the parent node.
     *
     * @param {VTree} currentParent - Active element VTree
     * @param {string} markup - Incoming partial HTML markup
     * @param {Supplemental} supplemental - Dynamic interpolated data values
     */
    const interpolateChildNodes = (currentParent, markup, supplemental) => {
      if ('childNodes' in currentParent.attributes) {
        return;
      }

      // If this is text and not a doctype, add as a text node.
      if (markup && !doctypeEx.test(markup) && !tokenEx.test(markup)) {
        return currentParent.childNodes.push(/** @type {VTree} */ (createTree('#text', markup)));
      }

      const childNodes = [];
      const parts = markup.split(tokenEx);

      for (let i = 0; i < parts.length; i++) {
        const value = parts[i];

        if (!value) { continue; }

        // When we split on the token expression, the capture group will replace
        // the token's position. So all we do is ensure that we're on an odd
        // index and then we can source the correct value.
        if (i % 2 === 1) {
          const supValue = supplemental.children[value];
          const innerTree = value in supplemental.children ? supValue : createTree(
            '#text',
            `${TOKEN}${value}__`,
          );

          if (!innerTree) continue;

          const isFragment = innerTree.nodeType === NODE_TYPE.FRAGMENT;

          if (typeof innerTree.rawNodeName === 'string' && isFragment) {
            childNodes.push(...innerTree.childNodes);
          }
          else {
            childNodes.push(innerTree);
          }
        }
        else if (!doctypeEx.test(value)) {
          childNodes.push(createTree('#text', value));
        }
      }

      currentParent.childNodes.push(...childNodes);
    };

    /**
     * HTMLElement, which contains a set of children.
     *
     * Note: this is a minimalist implementation, no complete tree structure
     * provided (no parentNode, nextSibling, previousSibling etc).
     *
     * @param {String} nodeName - DOM Node name
     * @param {String} rawAttrs - DOM Node Attributes
     * @param {Supplemental} supplemental - Interpolated data from a tagged template
     * @param {TransactionConfig} options
     * @return {VTree} vTree
     */
    const HTMLElement = (nodeName, rawAttrs, supplemental, options) => {
      let match = null;
      const attrEx = /([_@$#a-z][^\s\x00-\x1F"'>\/=\uFDD0-\uFDEF\uFFFE\uFFFF]*)\s*(=\s*("([^"]+)"|'([^']+)'|(\S+)))?/ig;

      // Support dynamic tag names like: `<${MyComponent} />`.
      if (match = tokenEx.exec(nodeName)) {
        return HTMLElement(
          supplemental.tags[match[1]],
          rawAttrs,
          supplemental,
          options
        );
      }

      /** @type {{ [key: string]: any }} */
      const attributes = {};

      // Migrate raw attributes into the attributes object used by the VTree.
      for (let match; match = attrEx.exec(rawAttrs || EMPTY.STR);) {
        const isHTML = typeof nodeName === 'string';
        const name = match[1];

        let tokenValue;

        if (name === '') {
          const match = rawAttrs.match(tokenEx);
          tokenValue = match ? match[0] : '';
        }

        const testValue = match[6] || match[5] || match[4];
        /** @type {unknown} */
        const rawValue = tokenValue || testValue || (isHTML ? match[1] : testValue || true);
        const value = rawValue === `''` || rawValue === `""` ? EMPTY.STR : rawValue;
        let valueMatchesToken = String(value).match(tokenEx);

        // If we have multiple interpolated values in an attribute, we must
        // flatten to a string. There are no other valid options.
        if (valueMatchesToken && valueMatchesToken.length) {
          const parts = String(value).split(tokenEx);
          const hasToken = tokenEx.exec(name);
          const newName = hasToken ? supplemental.attributes[hasToken[1]] : name;

          for (let i = 0; i < parts.length; i++) {
            /** @type {string} */
            const value = parts[i];

            if (!value) { continue; }

            // When we split on the token expression, the capture group will
            // replace the token's position. So all we do is ensure that we're on
            // an odd index and then we can source the correct value.
            if (i % 2 === 1) {
              const isObject = typeof newName === 'object';
              const hasSupValue = value in supplemental.attributes;
              const supValue = supplemental.attributes[value];
              const fallback = `${TOKEN}${value}__`;

              // Allow interpolating multiple values into a single attribute.
              if (attributes[newName]) {
                attributes[newName] += hasSupValue ? supValue : fallback;
              }
              // Merge object attributes directly into the existing attributes.
              else if (isObject) {
                if (newName && !isArray(newName)) {
                  assign(attributes, newName);
                }
                else {
                  if (process.env.NODE_ENV !== 'production') {
                    throw new Error('Arrays cannot be spread as attributes');
                  }
                }
              }
              else if (newName) {
                const defaultValue = hasSupValue ? supValue : fallback;
                attributes[newName] = testValue ? defaultValue : true;
              }
            }
            // Otherwise this is a static iteration, simply concat the raw value into the attribute.
            else if (attributes[newName]) {
              attributes[newName] += value;
            }
            // Set the initial attribute value.
            else {
              attributes[newName] = value;
            }
          }
        }
        // If the name was injected, pull from attributes and assign as either
        // empty or truthy.
        else if (valueMatchesToken = tokenEx.exec(name)) {
          const nameAndValue = supplemental.attributes[valueMatchesToken[1]];

          if (typeof nameAndValue === 'object' && !isArray(nameAndValue)) {
            assign(attributes, nameAndValue);
          }
          else {
            attributes[nameAndValue] = value;
          }
        }
        // If the remaining value is a string, directly assign to the attribute
        // name. If the value is anything else, treat it as unknown and default to
        // a boolean.
        else {
          // If no test value was found, this means no real value was provided, use
          // the default value of true.
          attributes[name] = testValue !== undefined ? value : true;
        }
      }

      return createTree(nodeName, attributes, attributes.childNodes || []);
    };

    /**
     * Parses HTML and returns a root element
     *
     * @param {String} html - String of HTML markup to parse into a Virtual Tree
     * @param {Supplemental=} supplemental - Dynamic interpolated data values
     * @param {TransactionConfig=} options - Contains options like silencing warnings
     * @return {VTree} - Parsed Virtual Tree Element
     */
    export default function parse(html, supplemental, options = {}) {
      if (!options.parser) {
        /** @type {ParserConfig} */
        options.parser = {};
      }

      if (!supplemental) {
        supplemental = defaultSupplemental;
      }

      const blockText = new Set(
        /** @type {string[]} */(
          getConfig(
            'rawElements',
            rawElementsDefaults,
            'array',
            options.parser,
          )
        ),
      );

      const selfClosing = new Set(
        /** @type {string[]} */(
          getConfig(
            'selfClosingElements',
            selfClosingElementsDefaults,
            'array',
            options.parser,
          )
        ),
      );

      const tagEx =
        /<!--[^]*?(?=-->)-->|<(\/?)([a-z\-\_][a-z0-9\-\_]*)\s*([^>]*?)(".*?"|'.*?')?(\/?)>/ig;
      const root = createTree('#document-fragment', null, []);
      const stack = [root];
      let currentParent = root;
      let lastTextPos = -1;

      if (process.env.NODE_ENV !== 'production') {
        const markup = [html];

        if (!html.includes('<') && options.parser.strict) {
          markup.splice(1, 0, `
    Possibly invalid markup. Opening tag was not properly opened.
          `);

          throw new Error(`\n\n${markup.join('\n')}`);
        }

        if (!html.includes('>') && options.parser.strict) {
          markup.splice(1, 0, `
    Possibly invalid markup. Opening tag was not properly closed.
          `);

          throw new Error(`\n\n${markup.join('\n')}`);
        }
      }

      // If there are no HTML elements, treat the passed in html as a single
      // text node.
      if (!html.includes('<') && html) {
        interpolateChildNodes(currentParent, html, supplemental);
        return root;
      }

      // Look through the HTML markup for valid tags.
      for (let match, text, i=0; match = tagEx.exec(html); i++) {
        const [
          fullMatch,
          isClosingMatch,
          tagMatch,
          attributeMatch,
          extraMatch,
          selfClosingMatch,
        ] = match;

        if (lastTextPos > -1) {
          if (lastTextPos + fullMatch.length < tagEx.lastIndex) {
            text = html.slice(lastTextPos, tagEx.lastIndex - fullMatch.length);

            if (text) {
              interpolateChildNodes(currentParent, text, supplemental);
            }
          }
        }

        const matchOffset = tagEx.lastIndex - fullMatch.length;

        if (lastTextPos === -1 && matchOffset > 0) {
          const string = html.slice(0, matchOffset);

          if (string && !doctypeEx.exec(string)) {
            interpolateChildNodes(currentParent, string, supplemental);
          }
        }

        lastTextPos = tagEx.lastIndex;

        // This is a comment (TODO someday support these).
        if (match[0][1] === '!') {
          continue;
        }

        // Get the tag index.
        const tokenMatch = tokenEx.exec(tagMatch);

        // Normalized name, use either the tag extracted from the supplemental
        // tags, or use tagMatch.
        const supTag = tokenMatch && supplemental.tags[tokenMatch[1]];
        const name = supTag ? supTag.name || supTag : tagMatch;

        let bypassMatch;

        if (!isClosingMatch) {
          // not </ tags
          if (!match[4] && kElementsClosedByOpening[currentParent.rawNodeName]) {
            if (kElementsClosedByOpening[currentParent.rawNodeName][name]) {
              stack.pop();
              currentParent = stack[stack.length - 1];
            }
          }

          const attrs = attributeMatch + (extraMatch || '');
          currentParent = currentParent.childNodes[
            currentParent.childNodes.push(
              HTMLElement(tagMatch, attrs, supplemental, options)
            ) - 1
          ];

          stack.push(currentParent);

          if (options.parser.strict || blockText.has(name)) {
            // A little test to find next </script> or </style> ...
            const closeMarkup = `</${name}>`;
            const index = html.indexOf(closeMarkup, tagEx.lastIndex);

            if (process.env.NODE_ENV !== 'production') {
              if (index === -1 && options.parser.strict && !selfClosing.has(name)) {
                // Find a subset of the markup passed in to validate.
                const markup = html
                  .slice(tagEx.lastIndex - fullMatch.length)
                  .split('\n')
                  .map(line => line.replace(tokenEx, (value, index) => {
                    if (!supplemental) {
                      return value;
                    }

                    const { tags, children, attributes } = supplemental;
                    return tags[index] || children[index] || attributes[index];
                  }))
                  .slice(0, 3);

                // Position the caret next to the first non-whitespace character.
                const lookup = spaceEx.exec(markup[0]);
                const caret = Array(
                  (lookup ? lookup.index - 1 : 0) + closeMarkup.length - 1
                ).join(' ') + '^';

                // Craft the warning message and inject it into the markup.
                markup.splice(1, 0, `${caret}
        Possibly invalid markup. <${name}> must be closed in strict mode.
                `);

                // Throw an error message if the markup isn't what we expected.
                throw new Error(`\n\n${markup.join('\n')}`);
              }
            }

            if (blockText.has(name)) {
              if (index === -1) {
                lastTextPos = tagEx.lastIndex = html.length + 1;
              }
              else {
                lastTextPos = index + closeMarkup.length;
                tagEx.lastIndex = lastTextPos;
                bypassMatch = true;
              }

              const newText = html.slice(match.index + fullMatch.length, index);
              interpolateChildNodes(currentParent, newText, supplemental);
            }
          }
        }

        if (bypassMatch || isClosingMatch || selfClosingMatch || selfClosing.has(name)) {
          if (process.env.NODE_ENV !== 'production') {
            if (currentParent && name !== currentParent.rawNodeName && options.parser.strict) {
              const nodeName = currentParent.rawNodeName;

              // Find a subset of the markup passed in to validate.
              const markup = html
                .slice(tagEx.lastIndex - fullMatch.length)
                .split('\n')
                .map(line => line.replace(tokenEx, (value, index) => {
                  if (!supplemental) {
                    return value;
                  }

                  const { tags, children, attributes } = supplemental;
                  return tags[index] || children[index] || attributes[index];
                }))
                .slice(0, 3);

              // Position the caret next to the first non-whitespace character.
              const lookup = spaceEx.exec(markup[0]);
              const caret = Array(lookup ? lookup.index : 0).join(' ') + '^';

              // Craft the warning message and inject it into the markup.
              markup.splice(1, 0, `${caret}
      Possibly invalid markup. Saw ${name}, expected ${nodeName}...
              `);

              // Throw an error message if the markup isn't what we expected.
              throw new Error(`\n\n${markup.join('\n')}`);
            }
          }

          // </ or /> or <br> etc.
          while (currentParent) {
            // Self closing dynamic nodeName.
            if (selfClosingMatch === '/' && tokenMatch) {
              stack.pop();
              currentParent = stack[stack.length - 1];

              break;
            }
            // Not self-closing, so seek out the next match.
            else if (supTag) {
              if (currentParent.rawNodeName === name) {
                stack.pop();
                currentParent = stack[stack.length - 1];

                break;
              }
            }

            if (currentParent.rawNodeName === name) {
              stack.pop();
              currentParent = stack[stack.length - 1];

              break;
            }
            else {
              const tag = kElementsClosedByClosing[currentParent.rawNodeName];

              // Trying to close current tag, and move on
              if (tag) {
                if (tag[name]) {
                  stack.pop();
                  currentParent = stack[stack.length - 1];

                  continue;
                }
              }

              // Use aggressive strategy to handle unmatching markups.
              break;
            }
          }
        }
      }

      // Find any last remaining text after the parsing completes over tags.
      const remainingText = html.slice(lastTextPos === -1 ? 0 : lastTextPos);

      if (process.env.NODE_ENV !== 'production') {
        if ((remainingText.includes('>') || remainingText.includes('<')) && options.parser.strict) {
          // Find a subset of the markup passed in to validate.
          const markup = [remainingText];

          // Position the caret next to the first non-whitespace character.
          const lookup = spaceEx.exec(markup[0]);
          const caret = Array(lookup ? lookup.index : 0).join(' ') + '^';

          // Craft the warning message and inject it into the markup.
          if (remainingText.includes('>')) {
            markup.splice(1, 0, `${caret}
      Possibly invalid markup. Opening tag was not properly opened.
            `);
          }
          else {
            markup.splice(1, 0, `${caret}
      Possibly invalid markup. Opening tag was not properly closed.
            `);
          }

          // Throw an error message if the markup isn't what we expected.
          throw new Error(`\n\n${markup.join('\n')}`);
        }
      }

      // Ensure that all values are properly interpolated through the remaining
      // markup after parsing.
      if (remainingText) {
        interpolateChildNodes(currentParent, remainingText, supplemental);
      }

      // This is an entire document, so only allow the HTML children to be
      // body or head.
      if (root.childNodes.length && root.childNodes[0].nodeName === 'html') {
        // Store elements from before body end and after body end.
        /** @type {{ [name: string]: VTree[] }} */
        const head = { before: [], after: [] };
        /** @type {{ [name: string]: VTree[] }} */
        const body = { after: [] };
        const HTML = root.childNodes[0];

        let beforeHead = true;
        let beforeBody = true;

        // Iterate the children and store elements in the proper array for
        // later concat, replace the current childNodes with this new array.
        HTML.childNodes = HTML.childNodes.filter(el => {
          // If either body or head, allow as a valid element.
          if (el.nodeName === 'body' || el.nodeName === 'head') {
            if (el.nodeName === 'head') beforeHead = false;
            if (el.nodeName === 'body') beforeBody = false;

            return true;
          }
          // Not a valid nested HTML tag element, move to respective container.
          else if (el.nodeType === NODE_TYPE.ELEMENT) {
            if (beforeHead && beforeBody) head.before.push(el);
            else if (!beforeHead && beforeBody) head.after.push(el);
            else if (!beforeBody) body.after.push(el);
          }
        });

        // Ensure the first element is the HEAD tag.
        if (!HTML.childNodes[0] || HTML.childNodes[0].nodeName !== 'head') {
          const headInstance = createTree('head', null, []);

          if (headInstance) {
            const existing = headInstance.childNodes;

            existing.unshift.apply(existing, head.before);
            existing.push.apply(existing, head.after);
            HTML.childNodes.unshift(headInstance);
          }
        }
        else {
          const existing = HTML.childNodes[0].childNodes;

          existing.unshift.apply(existing, head.before);
          existing.push.apply(existing, head.after);
        }

        // Ensure the second element is the body tag.
        if (!HTML.childNodes[1] || HTML.childNodes[1].nodeName !== 'body') {
          const bodyInstance = createTree('body', null, []);

          if (bodyInstance) {
            const existing = bodyInstance.childNodes;

            existing.push.apply(existing, body.after);
            HTML.childNodes.push(bodyInstance);
          }
        }
        else {
          const existing = HTML.childNodes[1].childNodes;
          existing.push.apply(existing, body.after);
        }
      }

      return root;
    }