Initial commit

node_modules/doiuse/stream.js

@@ -0,0 +1,80 @@
+var through = require('through2')
+var duplexer = require('duplexer2')
+var rules = require('css-rule-stream')
+var sourcemap = require('source-map')
+
+var postcss = require('postcss')
+var doiuse = require('./')
+
+module.exports = stream
+
+/**
+ * @param {Object} options (browsers, ignore, etc.)
+ * @param {string} [filename]  Filename for outputting source code locations.
+ */
+function stream (options, filename) {
+  var inp = rules()
+  filename = filename || '<streaming css input>'
+
+  var processor
+
+  var out = through.obj(write)
+  var duplex = duplexer(inp, out)
+
+  try {
+    processor = postcss([doiuse({
+      browsers: options.browsers,
+      ignore: options.ignore,
+      onFeatureUsage: pushUsage
+    })])
+
+    inp.pipe(out)
+  } catch (e) {
+    setImmediate(function () { duplex.emit('error', e) })
+  }
+
+  return duplex
+
+  function write (rule, enc, next) {
+    try {
+      var mapper = new sourcemap.SourceMapGenerator()
+
+      var lines = rule.content.split('\n')
+      var oline = rule.line
+      var ocol = rule.column
+      for (var line = 0; line < lines.length; line++) {
+        mapper.addMapping({
+          generated: { line: line + 1, column: 1 },
+          original: { line: oline, column: ocol },
+          source: filename
+        })
+        mapper.addMapping({
+          generated: { line: line + 1, column: lines[line].length },
+          original: { line: oline, column: ocol + lines[line].length },
+          source: filename
+        })
+        oline++
+        ocol = 1
+      }
+
+      processor.process(rule.content, { map: { prev: mapper.toString() } })
+        .then(function (result) { next() })
+        .catch(handleError)
+    } catch (e) {
+      handleError(e)
+    }
+
+    function handleError (error) {
+      if (options.skipErrors) {
+        duplex.emit('warning', error)
+        next()
+      } else {
+        next(error)
+      }
+    }
+  }
+
+  function pushUsage (usage) {
+    out.push(usage)
+  }
+}