[wallet] show ToS markdown in expandable sections

1 files changed, 65 insertions, 0 deletions

diff --git a/wallet/src/main/java/net/taler/wallet/withdraw/TosSection.kt b/wallet/src/main/java/net/taler/wallet/withdraw/TosSection.kt
new file mode 100644
index 0000000..72a9e34
--- /dev/null
+++ b/wallet/src/main/java/net/taler/wallet/withdraw/TosSection.kt
@@ -0,0 +1,65 @@
+/*
+ * This file is part of GNU Taler
+ * (C) 2020 Taler Systems S.A.
+ *
+ * GNU Taler is free software; you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation; either version 3, or (at your option) any later version.
+ *
+ * GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ * A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+package net.taler.wallet.withdraw
+
+import io.noties.markwon.Markwon
+import org.commonmark.node.Document
+import org.commonmark.node.Heading
+import org.commonmark.node.Node
+import org.commonmark.node.Text
+import java.text.ParseException
+
+data class TosSection(
+    val title: String,
+    val node: Node,
+    var expanded: Boolean = false
+)
+
+@Throws(ParseException::class)
+internal fun parseTos(markwon: Markwon, text: String): List<TosSection> {
+    var node: Node? =
+        markwon.parse(text).firstChild ?: throw ParseException("Invalid markdown", 0)
+    var lastHeading: String? = null
+    var section = Document()
+    val sections = ArrayList<TosSection>()
+    while (node != null) {
+        val next: Node? = node.next
+        if (node is Heading && node.level == 1) {
+            // if lastHeading exists, close previous section
+            if (lastHeading != null) {
+                sections.add(TosSection(lastHeading, section))
+                section = Document()
+            }
+            // check that this is a plain heading
+            if (node.firstChild !is Text || node.firstChild.next != null) {
+                throw ParseException(
+                    "Primary heading includes more than just text", sections.size
+                )
+            }
+            // start new section
+            lastHeading = (node.firstChild as Text).literal
+        } else if (lastHeading == null) {
+            throw ParseException("Found text before first primary heading", 0)
+        } else {
+            section.appendChild(node)
+        }
+        node = next
+    }
+    check(lastHeading != null)
+    sections.add(TosSection(lastHeading, section))
+    return sections
+}