planning

node_modules/micromark-extension-gfm-task-list-item/syntax.js

@@ -0,0 +1,80 @@
+var markdownLineEndingOrSpace = require('micromark/dist/character/markdown-line-ending-or-space')
+var spaceFactory = require('micromark/dist/tokenize/factory-space')
+var prefixSize = require('micromark/dist/util/prefix-size')
+
+var tasklistCheck = {tokenize: tokenizeTasklistCheck}
+
+exports.text = {91: tasklistCheck}
+
+function tokenizeTasklistCheck(effects, ok, nok) {
+  var self = this
+
+  return open
+
+  function open(code) {
+    if (
+      // Exit if not `[`.
+      code !== 91 ||
+      // Exit if there’s stuff before.
+      self.previous !== null ||
+      // Exit if not in the first content that is the first child of a list
+      // item.
+      !self._gfmTasklistFirstContentOfListItem
+    ) {
+      return nok(code)
+    }
+
+    effects.enter('taskListCheck')
+    effects.enter('taskListCheckMarker')
+    effects.consume(code)
+    effects.exit('taskListCheckMarker')
+    return inside
+  }
+
+  function inside(code) {
+    // Tab or space.
+    if (code === -2 || code === 32) {
+      effects.enter('taskListCheckValueUnchecked')
+      effects.consume(code)
+      effects.exit('taskListCheckValueUnchecked')
+      return close
+    }
+
+    // Upper- and lower `x`.
+    if (code === 88 || code === 120) {
+      effects.enter('taskListCheckValueChecked')
+      effects.consume(code)
+      effects.exit('taskListCheckValueChecked')
+      return close
+    }
+
+    return nok(code)
+  }
+
+  function close(code) {
+    // `]`
+    if (code === 93) {
+      effects.enter('taskListCheckMarker')
+      effects.consume(code)
+      effects.exit('taskListCheckMarker')
+      effects.exit('taskListCheck')
+      return effects.check({tokenize: spaceThenNonSpace}, ok, nok)
+    }
+
+    return nok(code)
+  }
+}
+
+function spaceThenNonSpace(effects, ok, nok) {
+  var self = this
+
+  return spaceFactory(effects, after, 'whitespace')
+
+  function after(code) {
+    return prefixSize(self.events, 'whitespace') &&
+      code !== null &&
+      !markdownLineEndingOrSpace(code)
+      ? ok(code)
+      : nok(code)
+  }
+}