From 59ffc10f5bc14e24d9d8dcdf7049f8560d1855a6 Mon Sep 17 00:00:00 2001
From: Ian Gulliver <ian@flamingcow.tv>
Date: Tue, 25 Jun 2019 19:43:32 +0000
Subject: [PATCH] Start of graphviz export

---
 architype.js | 61 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)

diff --git a/architype.js b/architype.js
index 1392ae6..61cf6d6 100644
--- a/architype.js
+++ b/architype.js
@@ -8,6 +8,8 @@ class Architype {
     // TODO: make theme selectable
     this.container_.classList.add('google');
 
+    this.container_.addEventListener('keydown', (e) => { this.onKeyDown(e); });
+
     let editorElem = document.createElement('ul');
     this.container_.appendChild(editorElem);
     this.editor_ = new Editor(editorElem);
@@ -51,12 +53,26 @@ class Architype {
   }
 
   onEdit(e) {
+    // TODO: differentiate between value change and structure change
     localStorage.setItem('currentState', JSON.stringify(this.serialize()));
     this.graph_ = this.buildGraph();
     console.log(this.graph_);
     this.updateTargets();
   }
 
+  onKeyDown(e) {
+    switch (e.key) {
+      case 'z':
+        this.exportGraphviz();
+        break;
+    }
+  }
+
+  exportGraphviz() {
+    let lines = this.editor_.exportGraphviz('digraph G');
+    navigator.clipboard.writeText(lines.join('\n'));
+  }
+
   updateTargets() {
     // Lots of effort to avoid churning the datalist
 
@@ -408,6 +424,22 @@ class Editor extends List {
     }
   }
 
+  exportGraphviz(prefix, extras) {
+    let ret = [
+        prefix + ' {',
+    ];
+    if (extras) {
+      ret.push(...extras);
+    }
+    for (let entry of this.getEntries()) {
+      for (let line of entry.exportGraphviz()) {
+        ret.push('\t' + line);
+      }
+    }
+    ret.push('}');
+    return ret;
+  }
+
   isAllowed(type) {
     return this.mayAdd() && this.allowedTypes_.has(type);
   }
@@ -589,6 +621,13 @@ class Node extends EditorEntryBase {
     };
   }
 
+  exportGraphviz() {
+    if (this.getLabel() == '') {
+      return [];
+    }
+    return ['"' + this.getLabel() + '";'];
+  }
+
   clear() {
     super.clear();
     this.elem_.classList.remove('error');
@@ -724,6 +763,16 @@ class Group extends EditorEntryBase {
     };
   }
 
+  exportGraphviz() {
+    let extras = (this.getLabel() == '' ?
+                  [] :
+                  ['label = "' + this.getLabel() + '";']);
+    let ret = this.nodes_.exportGraphviz(
+        'subgraph ' + Math.floor(Math.random() * 999999999),
+        extras);
+    return ret;
+  }
+
   clear() {
     super.clear();
     this.elem_.classList.remove('error');
@@ -857,6 +906,18 @@ class Link extends EditorEntryBase {
     };
   }
 
+  exportGraphviz() {
+    if (this.getFrom().getLabel() == '' || this.getTo().getLabel() == '') {
+      return [];
+    }
+    let str = '"' + this.getFrom().getLabel() + '" -> "' +
+        this.getTo().getLabel() + '"';
+    if (this.getLabel()) {
+      str += ' [label="' + this.getLabel() + '"]';
+    }
+    return [str + ';'];
+  };
+
   clear() {
     super.clear();
     this.elem_.classList.remove('error');