feat: fork ink and make it work nicely

ui-tui/packages/hermes-ink/src/ink/squash-text-nodes.ts

@@ -0,0 +1,74 @@
+import type { DOMElement } from './dom.js'
+import type { TextStyles } from './styles.js'
+
+/**
+ * A segment of text with its associated styles.
+ * Used for structured rendering without ANSI string transforms.
+ */
+export type StyledSegment = {
+  text: string
+  styles: TextStyles
+  hyperlink?: string
+}
+
+/**
+ * Squash text nodes into styled segments, propagating styles down through the tree.
+ * This allows structured styling without relying on ANSI string transforms.
+ */
+export function squashTextNodesToSegments(
+  node: DOMElement,
+  inheritedStyles: TextStyles = {},
+  inheritedHyperlink?: string,
+  out: StyledSegment[] = []
+): StyledSegment[] {
+  const mergedStyles = node.textStyles ? { ...inheritedStyles, ...node.textStyles } : inheritedStyles
+
+  for (const childNode of node.childNodes) {
+    if (childNode === undefined) {
+      continue
+    }
+
+    if (childNode.nodeName === '#text') {
+      if (childNode.nodeValue.length > 0) {
+        out.push({
+          text: childNode.nodeValue,
+          styles: mergedStyles,
+          hyperlink: inheritedHyperlink
+        })
+      }
+    } else if (childNode.nodeName === 'ink-text' || childNode.nodeName === 'ink-virtual-text') {
+      squashTextNodesToSegments(childNode, mergedStyles, inheritedHyperlink, out)
+    } else if (childNode.nodeName === 'ink-link') {
+      const href = childNode.attributes['href'] as string | undefined
+      squashTextNodesToSegments(childNode, mergedStyles, href || inheritedHyperlink, out)
+    }
+  }
+
+  return out
+}
+
+/**
+ * Squash text nodes into a plain string (without styles).
+ * Used for text measurement in layout calculations.
+ */
+function squashTextNodes(node: DOMElement): string {
+  let text = ''
+
+  for (const childNode of node.childNodes) {
+    if (childNode === undefined) {
+      continue
+    }
+
+    if (childNode.nodeName === '#text') {
+      text += childNode.nodeValue
+    } else if (childNode.nodeName === 'ink-text' || childNode.nodeName === 'ink-virtual-text') {
+      text += squashTextNodes(childNode)
+    } else if (childNode.nodeName === 'ink-link') {
+      text += squashTextNodes(childNode)
+    }
+  }
+
+  return text
+}
+
+export default squashTextNodes