1 files changed, 61 insertions, 0 deletions
diff --git a/node_modules/vue/src/platforms/web/runtime/class-util.js b/node_modules/vue/src/platforms/web/runtime/class-util.js
new file mode 100644
index 00000000..709526c2
--- /dev/null
+++ b/node_modules/vue/src/platforms/web/runtime/class-util.js
@@ -0,0 +1,61 @@
+/* @flow */
+
+/**
+ * Add class with compatibility for SVG since classList is not supported on
+ * SVG elements in IE
+ */
+export function addClass (el: HTMLElement, cls: ?string) {
+  /* istanbul ignore if */
+  if (!cls || !(cls = cls.trim())) {
+    return
+  }
+
+  /* istanbul ignore else */
+  if (el.classList) {
+    if (cls.indexOf(' ') > -1) {
+      cls.split(/\s+/).forEach(c => el.classList.add(c))
+    } else {
+      el.classList.add(cls)
+    }
+  } else {
+    const cur = ` ${el.getAttribute('class') || ''} `
+    if (cur.indexOf(' ' + cls + ' ') < 0) {
+      el.setAttribute('class', (cur + cls).trim())
+    }
+  }
+}
+
+/**
+ * Remove class with compatibility for SVG since classList is not supported on
+ * SVG elements in IE
+ */
+export function removeClass (el: HTMLElement, cls: ?string) {
+  /* istanbul ignore if */
+  if (!cls || !(cls = cls.trim())) {
+    return
+  }
+
+  /* istanbul ignore else */
+  if (el.classList) {
+    if (cls.indexOf(' ') > -1) {
+      cls.split(/\s+/).forEach(c => el.classList.remove(c))
+    } else {
+      el.classList.remove(cls)
+    }
+    if (!el.classList.length) {
+      el.removeAttribute('class')
+    }
+  } else {
+    let cur = ` ${el.getAttribute('class') || ''} `
+    const tar = ' ' + cls + ' '
+    while (cur.indexOf(tar) >= 0) {
+      cur = cur.replace(tar, ' ')
+    }
+    cur = cur.trim()
+    if (cur) {
+      el.setAttribute('class', cur)
+    } else {
+      el.removeAttribute('class')
+    }
+  }
+}