FM / postcss-nested

/opt/canhelp/node_modules/postcss-nested/

/opt/canhelp/node_modules/postcss-nested

Name	Size	Mode	Actions
index.d.ts	1161	0644	edit dl rm
index.js	9058	0644	edit dl rm
LICENSE	1095	0644	edit dl rm
package.json	695	0644	edit dl rm
README.md	1953	0644	edit dl rm

Edit: /opt/canhelp/node_modules/postcss-nested/index.js (9058B)

const { AtRule, Rule } = require('postcss')
let parser = require('postcss-selector-parser')

/**
 * Run a selector string through postcss-selector-parser
 */
function parse(rawSelector, rule) {
  let nodes
  try {
    parser(parsed => {
      nodes = parsed
    }).processSync(rawSelector)
  } catch (e) {
    if (rawSelector.includes(':')) {
      throw rule ? rule.error('Missed semicolon') : e
    } else {
      throw rule ? rule.error(e.message) : e
    }
  }
  return nodes.at(0)
}

/**
 * Replaces the "&" token in a node's selector with the parent selector
 * similar to what SCSS does.
 *
 * Mutates the nodes list
 */
function interpolateAmpInSelector(nodes, parent) {
  let replaced = false
  nodes.each(node => {
    if (node.type === 'nesting') {
      let clonedParent = parent.clone({})
      if (node.value !== '&') {
        node.replaceWith(
          parse(node.value.replace('&', clonedParent.toString()))
        )
      } else {
        node.replaceWith(clonedParent)
      }
      replaced = true
    } else if ('nodes' in node && node.nodes) {
      if (interpolateAmpInSelector(node, parent)) {
        replaced = true
      }
    }
  })
  return replaced
}

/**
 * Combines parent and child selectors, in a SCSS-like way
 */
function mergeSelectors(parent, child) {
  let merged = []
  parent.selectors.forEach(sel => {
    let parentNode = parse(sel, parent)

child.selectors.forEach(selector => {
      if (!selector) {
        return
      }
      let node = parse(selector, child)
      let replaced = interpolateAmpInSelector(node, parentNode)
      if (!replaced) {
        node.prepend(parser.combinator({ value: ' ' }))
        node.prepend(parentNode.clone({}))
      }
      merged.push(node.toString())
    })
  })
  return merged
}

/**
 * Move a child and its preceeding comment(s) to after "after"
 */
function breakOut(child, after) {
  let prev = child.prev()
  after.after(child)
  while (prev && prev.type === 'comment') {
    let nextPrev = prev.prev()
    after.after(prev)
    prev = nextPrev
  }
  return child
}

function createFnAtruleChilds(bubble) {
  return function atruleChilds(rule, atrule, bubbling, mergeSels = bubbling) {
    let children = []
    atrule.each(child => {
      if (child.type === 'rule' && bubbling) {
        if (mergeSels) {
          child.selectors = mergeSelectors(rule, child)
        }
      } else if (child.type === 'atrule' && child.nodes) {
        if (bubble[child.name]) {
          atruleChilds(rule, child, mergeSels)
        } else if (atrule[rootRuleMergeSel] !== false) {
          children.push(child)
        }
      } else {
        children.push(child)
      }
    })
    if (bubbling) {
      if (children.length) {
        let clone = rule.clone({ nodes: [] })
        for (let child of children) {
          clone.append(child)
        }
        atrule.prepend(clone)
      }
    }
  }
}

function pickDeclarations(selector, declarations, after) {
  let parent = new Rule({
    nodes: [],
    selector
  })
  parent.append(declarations)
  after.after(parent)
  return parent
}

function atruleNames(defaults, custom) {
  let list = {}
  for (let name of defaults) {
    list[name] = true
  }
  if (custom) {
    for (let name of custom) {
      list[name.replace(/^@/, '')] = true
    }
  }
  return list
}

function parseRootRuleParams(params) {
  params = params.trim()
  let braceBlock = params.match(/^$(.*)$$/)
  if (!braceBlock) {
    return { selector: params, type: 'basic' }
  }
  let bits = braceBlock[1].match(/^(with(?:out)?):(.+)$/)
  if (bits) {
    let allowlist = bits[1] === 'with'
    let rules = Object.fromEntries(
      bits[2]
        .trim()
        .split(/\s+/)
        .map(name => [name, true])
    )
    if (allowlist && rules.all) {
      return { type: 'noop' }
    }
    let escapes = rule => !!rules[rule]
    if (rules.all) {
      escapes = () => true
    } else if (allowlist) {
      escapes = rule => (rule === 'all' ? false : !rules[rule])
    }

return {
      escapes,
      type: 'withrules'
    }
  }
  // Unrecognized brace block
  return { type: 'unknown' }
}

function getAncestorRules(leaf) {
  let lineage = []
  let parent = leaf.parent

while (parent && parent instanceof AtRule) {
    lineage.push(parent)
    parent = parent.parent
  }
  return lineage
}

function unwrapRootRule(rule) {
  let escapes = rule[rootRuleEscapes]

if (!escapes) {
    rule.after(rule.nodes)
  } else {
    let nodes = rule.nodes

let topEscaped
    let topEscapedIdx = -1
    let breakoutLeaf
    let breakoutRoot
    let clone

let lineage = getAncestorRules(rule)
    lineage.forEach((parent, i) => {
      if (escapes(parent.name)) {
        topEscaped = parent
        topEscapedIdx = i
        breakoutRoot = clone
      } else {
        let oldClone = clone
        clone = parent.clone({ nodes: [] })
        oldClone && clone.append(oldClone)
        breakoutLeaf = breakoutLeaf || clone
      }
    })

if (!topEscaped) {
      rule.after(nodes)
    } else if (!breakoutRoot) {
      topEscaped.after(nodes)
    } else {
      let leaf = breakoutLeaf
      leaf.append(nodes)
      topEscaped.after(breakoutRoot)
    }

if (rule.next() && topEscaped) {
      let restRoot
      lineage.slice(0, topEscapedIdx + 1).forEach((parent, i, arr) => {
        let oldRoot = restRoot
        restRoot = parent.clone({ nodes: [] })
        oldRoot && restRoot.append(oldRoot)

let nextSibs = []
        let _child = arr[i - 1] || rule
        let next = _child.next()
        while (next) {
          nextSibs.push(next)
          next = next.next()
        }
        restRoot.append(nextSibs)
      })
      restRoot && (breakoutRoot || nodes[nodes.length - 1]).after(restRoot)
    }
  }

rule.remove()
}

const rootRuleMergeSel = Symbol('rootRuleMergeSel')
const rootRuleEscapes = Symbol('rootRuleEscapes')

function normalizeRootRule(rule) {
  let { params } = rule
  let { escapes, selector, type } = parseRootRuleParams(params)
  if (type === 'unknown') {
    throw rule.error(
      `Unknown @${rule.name} parameter ${JSON.stringify(params)}`
    )
  }
  if (type === 'basic' && selector) {
    let selectorBlock = new Rule({ nodes: rule.nodes, selector })
    rule.removeAll()
    rule.append(selectorBlock)
  }
  rule[rootRuleEscapes] = escapes
  rule[rootRuleMergeSel] = escapes ? !escapes('all') : type === 'noop'
}

const hasRootRule = Symbol('hasRootRule')

module.exports = (opts = {}) => {
  let bubble = atruleNames(
    ['media', 'supports', 'layer', 'container', 'starting-style'],
    opts.bubble
  )
  let atruleChilds = createFnAtruleChilds(bubble)
  let unwrap = atruleNames(
    [
      'document',
      'font-face',
      'keyframes',
      '-webkit-keyframes',
      '-moz-keyframes'
    ],
    opts.unwrap
  )
  let rootRuleName = (opts.rootRuleName || 'at-root').replace(/^@/, '')
  let preserveEmpty = opts.preserveEmpty

return {
    Once(root) {
      root.walkAtRules(rootRuleName, node => {
        normalizeRootRule(node)
        root[hasRootRule] = true
      })
    },

postcssPlugin: 'postcss-nested',

RootExit(root) {
      if (root[hasRootRule]) {
        root.walkAtRules(rootRuleName, unwrapRootRule)
        root[hasRootRule] = false
      }
    },

Rule(rule) {
      let unwrapped = false
      let after = rule
      let copyDeclarations = false
      let declarations = []

rule.each(child => {
        if (child.type === 'rule') {
          if (declarations.length) {
            after = pickDeclarations(rule.selector, declarations, after)
            declarations = []
          }

copyDeclarations = true
          unwrapped = true
          child.selectors = mergeSelectors(rule, child)
          after = breakOut(child, after)
        } else if (child.type === 'atrule') {
          if (declarations.length) {
            after = pickDeclarations(rule.selector, declarations, after)
            declarations = []
          }
          if (child.name === rootRuleName) {
            unwrapped = true
            atruleChilds(rule, child, true, child[rootRuleMergeSel])
            after = breakOut(child, after)
          } else if (bubble[child.name]) {
            copyDeclarations = true
            unwrapped = true
            atruleChilds(rule, child, true)
            after = breakOut(child, after)
          } else if (unwrap[child.name]) {
            copyDeclarations = true
            unwrapped = true
            atruleChilds(rule, child, false)
            after = breakOut(child, after)
          } else if (copyDeclarations) {
            declarations.push(child)
          }
        } else if (child.type === 'decl' && copyDeclarations) {
          declarations.push(child)
        }
      })

if (declarations.length) {
        after = pickDeclarations(rule.selector, declarations, after)
      }

if (unwrapped && preserveEmpty !== true) {
        rule.raws.semicolon = true
        if (rule.nodes.length === 0) rule.remove()
      }
    }
  }
}
module.exports.postcss = true

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