08-27-周三_17-09-29

node_modules/dagre-d3-renderer/lib/label/add-text-label.js

@@ -0,0 +1,45 @@
+import util from '../util'
+
+/*
+ * Attaches a text label to the specified root. Handles escape sequences.
+ */
+function addTextLabel (root, node) {
+  const domNode = root.append('text')
+
+  const lines = processEscapeSequences(node.label).split('\n')
+  for (let i = 0; i < lines.length; i += 1) {
+    domNode
+      .append('tspan')
+        .attr('xml:space', 'preserve')
+        .attr('dy', '1em')
+        .attr('x', '1')
+        .text(lines[i])
+  }
+
+  util.applyStyle(domNode, node.labelStyle)
+
+  return domNode
+}
+
+function processEscapeSequences (text) {
+  let newText = ''
+  let escaped = false
+  let ch = null
+  for (let i = 0; i < text.length; i += 1) {
+    ch = text[i]
+    if (escaped) {
+      switch (ch) {
+        case 'n': newText += '\n'; break
+        default: newText += ch
+      }
+      escaped = false
+    } else if (ch === '\\') {
+      escaped = true
+    } else {
+      newText += ch
+    }
+  }
+  return newText
+}
+
+export default addTextLabel