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node_modules/autoprefixer/lib/declaration.js

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+let Prefixer = require('./prefixer')
+let Browsers = require('./browsers')
+let utils = require('./utils')
+
+class Declaration extends Prefixer {
+  /**
+   * Always true, because we already get prefixer by property name
+   */
+  check(/* decl */) {
+    return true
+  }
+
+  /**
+   * Return prefixed version of property
+   */
+  prefixed(prop, prefix) {
+    return prefix + prop
+  }
+
+  /**
+   * Return unprefixed version of property
+   */
+  normalize(prop) {
+    return prop
+  }
+
+  /**
+   * Check `value`, that it contain other prefixes, rather than `prefix`
+   */
+  otherPrefixes(value, prefix) {
+    for (let other of Browsers.prefixes()) {
+      if (other === prefix) {
+        continue
+      }
+      if (value.includes(other)) {
+        return true
+      }
+    }
+    return false
+  }
+
+  /**
+   * Set prefix to declaration
+   */
+  set(decl, prefix) {
+    decl.prop = this.prefixed(decl.prop, prefix)
+    return decl
+  }
+
+  /**
+   * Should we use visual cascade for prefixes
+   */
+  needCascade(decl) {
+    if (!decl._autoprefixerCascade) {
+      decl._autoprefixerCascade =
+        this.all.options.cascade !== false && decl.raw('before').includes('\n')
+    }
+    return decl._autoprefixerCascade
+  }
+
+  /**
+   * Return maximum length of possible prefixed property
+   */
+  maxPrefixed(prefixes, decl) {
+    if (decl._autoprefixerMax) {
+      return decl._autoprefixerMax
+    }
+
+    let max = 0
+    for (let prefix of prefixes) {
+      prefix = utils.removeNote(prefix)
+      if (prefix.length > max) {
+        max = prefix.length
+      }
+    }
+    decl._autoprefixerMax = max
+
+    return decl._autoprefixerMax
+  }
+
+  /**
+   * Calculate indentation to create visual cascade
+   */
+  calcBefore(prefixes, decl, prefix = '') {
+    let max = this.maxPrefixed(prefixes, decl)
+    let diff = max - utils.removeNote(prefix).length
+
+    let before = decl.raw('before')
+    if (diff > 0) {
+      before += Array(diff).fill(' ').join('')
+    }
+
+    return before
+  }
+
+  /**
+   * Remove visual cascade
+   */
+  restoreBefore(decl) {
+    let lines = decl.raw('before').split('\n')
+    let min = lines[lines.length - 1]
+
+    this.all.group(decl).up(prefixed => {
+      let array = prefixed.raw('before').split('\n')
+      let last = array[array.length - 1]
+      if (last.length < min.length) {
+        min = last
+      }
+    })
+
+    lines[lines.length - 1] = min
+    decl.raws.before = lines.join('\n')
+  }
+
+  /**
+   * Clone and insert new declaration
+   */
+  insert(decl, prefix, prefixes) {
+    let cloned = this.set(this.clone(decl), prefix)
+    if (!cloned) return undefined
+
+    let already = decl.parent.some(
+      i => i.prop === cloned.prop && i.value === cloned.value
+    )
+    if (already) {
+      return undefined
+    }
+
+    if (this.needCascade(decl)) {
+      cloned.raws.before = this.calcBefore(prefixes, decl, prefix)
+    }
+    return decl.parent.insertBefore(decl, cloned)
+  }
+
+  /**
+   * Did this declaration has this prefix above
+   */
+  isAlready(decl, prefixed) {
+    let already = this.all.group(decl).up(i => i.prop === prefixed)
+    if (!already) {
+      already = this.all.group(decl).down(i => i.prop === prefixed)
+    }
+    return already
+  }
+
+  /**
+   * Clone and add prefixes for declaration
+   */
+  add(decl, prefix, prefixes, result) {
+    let prefixed = this.prefixed(decl.prop, prefix)
+    if (
+      this.isAlready(decl, prefixed) ||
+      this.otherPrefixes(decl.value, prefix)
+    ) {
+      return undefined
+    }
+    return this.insert(decl, prefix, prefixes, result)
+  }
+
+  /**
+   * Add spaces for visual cascade
+   */
+  process(decl, result) {
+    if (!this.needCascade(decl)) {
+      super.process(decl, result)
+      return
+    }
+
+    let prefixes = super.process(decl, result)
+
+    if (!prefixes || !prefixes.length) {
+      return
+    }
+
+    this.restoreBefore(decl)
+    decl.raws.before = this.calcBefore(prefixes, decl)
+  }
+
+  /**
+   * Return list of prefixed properties to clean old prefixes
+   */
+  old(prop, prefix) {
+    return [this.prefixed(prop, prefix)]
+  }
+}
+
+module.exports = Declaration