1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168

import selectorParser from 'postcss-selector-parser'
import fs from 'fs'
import path from 'path'
import dset from 'dset'
import dlv from 'dlv'

function createSelectorFromNodes(nodes) {
  if (nodes.length === 0) return null
  const selector = selectorParser.selector()
  for (let i = 0; i < nodes.length; i++) {
    selector.append(nodes[i])
  }
  return String(selector).trim()
}

function getClassNamesFromSelector(selector) {
  const classNames = []
  const { nodes: subSelectors } = selectorParser().astSync(selector)

  for (let i = 0; i < subSelectors.length; i++) {
    let scope = []
    for (let j = 0; j < subSelectors[i].nodes.length; j++) {
      let node = subSelectors[i].nodes[j]
      let pseudo = []

      if (node.type === 'class') {
        let next = subSelectors[i].nodes[j + 1]

        while (next && next.type === 'pseudo') {
          pseudo.push(next)
          j++
          next = subSelectors[i].nodes[j + 1]
        }

        classNames.push({
          className: node.value.trim(),
          scope: createSelectorFromNodes(scope),
          __rule: j === subSelectors[i].nodes.length - 1,
          __pseudo: pseudo.map(String),
        })
      }
      scope.push(node, ...pseudo)
    }
  }

  return classNames
}

async function process(groups) {
  const tree = {}
  const commonContext = {}

  groups.forEach((group) => {
    group.root.walkRules((rule) => {
      const classNames = getClassNamesFromSelector(rule.selector)

      const decls = {}
      rule.walkDecls((decl) => {
        if (decls[decl.prop]) {
          decls[decl.prop] = [
            ...(Array.isArray(decls[decl.prop])
              ? decls[decl.prop]
              : [decls[decl.prop]]),
            decl.value,
          ]
        } else {
          decls[decl.prop] = decl.value
        }
      })

      let p = rule
      const keys = []
      while (p.parent.type !== 'root') {
        p = p.parent
        if (p.type === 'atrule') {
          keys.push(`@${p.name} ${p.params}`)
        }
      }

      for (let i = 0; i < classNames.length; i++) {
        const context = keys.concat([])
        const baseKeys = classNames[i].className.split('__TAILWIND_SEPARATOR__')
        const contextKeys = baseKeys.slice(0, baseKeys.length - 1)
        const index = []

        const existing = dlv(tree, baseKeys)
        if (typeof existing !== 'undefined') {
          if (Array.isArray(existing)) {
            const scopeIndex = existing.findIndex(
              (x) =>
                x.__scope === classNames[i].scope &&
                arraysEqual(existing.__context, context)
            )
            if (scopeIndex > -1) {
              keys.unshift(scopeIndex)
              index.push(scopeIndex)
            } else {
              keys.unshift(existing.length)
              index.push(existing.length)
            }
          } else {
            if (
              existing.__scope !== classNames[i].scope ||
              !arraysEqual(existing.__context, context)
            ) {
              dset(tree, baseKeys, [existing])
              keys.unshift(1)
              index.push(1)
            }
          }
        }
        if (classNames[i].__rule) {
          dset(tree, [...baseKeys, ...index, '__rule'], true)
          dset(tree, [...baseKeys, ...index, '__source'], group.source)

          dsetEach(tree, [...baseKeys, ...index], decls)
        }
        dset(tree, [...baseKeys, ...index, '__pseudo'], classNames[i].__pseudo)
        dset(tree, [...baseKeys, ...index, '__scope'], classNames[i].scope)
        dset(
          tree,
          [...baseKeys, ...index, '__context'],
          context.concat([]).reverse()
        )

        // common context
        context.push(...classNames[i].__pseudo)

        for (let i = 0; i < contextKeys.length; i++) {
          if (typeof commonContext[contextKeys[i]] === 'undefined') {
            commonContext[contextKeys[i]] = context
          } else {
            commonContext[contextKeys[i]] = intersection(
              commonContext[contextKeys[i]],
              context
            )
          }
        }
      }
    })
  })

  return { classNames: tree, context: commonContext }
}

function intersection(arr1, arr2) {
  return arr1.filter((value) => arr2.indexOf(value) !== -1)
}

function dsetEach(obj, keys, values) {
  const k = Object.keys(values)
  for (let i = 0; i < k.length; i++) {
    dset(obj, [...keys, k[i]], values[k[i]])
  }
}

function arraysEqual(a, b) {
  if (a === b) return true
  if (a == null || b == null) return false
  if (a.length !== b.length) return false

  for (let i = 0; i < a.length; ++i) {
    if (a[i] !== b[i]) return false
  }
  return true
}

export default process