Begin work on safely allowing concurrent edits on data, giving better form interface.

1 files changed, 57 insertions, 0 deletions

diff --git a/src/lib/Form.class.php b/src/lib/Form.class.php
new file mode 100644
index 0000000..725bac5
--- /dev/null
+++ b/src/lib/Form.class.php
@@ -0,0 +1,57 @@
+<?php
+
+require_once('Auth.class.php');
+
+class Form {
+	public $getter = null;
+	public $setter = null;
+	public function __constructor($get, $set) {
+		$this->getter = $get;
+		$this->setter = $set;
+	}
+	private function getConf($key) {
+		call_user_func($getter, $key);
+	}
+	public function setConf($key, $value) {
+		call_user_func($setter, $key, $value);
+	}
+	private function getConfString($key) {
+		$raw = $this->getConf($key);
+		$value = $raw['value'];
+		if ($value===false) return 'false';
+		if ($value===true)  return 'true';
+		return $value;
+	}
+
+	public function updateValue($value, $value_base=null) {
+		$doit = true;
+		$forked = false;
+		$have_old = ($value_base!==null);
+		if ($have_old) {
+			@$value_base = $old[$uid];
+			$we_changed_it = $value_base != $value;
+			if ($we_changed_it) {
+				$value_fork = $this->getConfString($key);
+				$someone_else_changed_it =
+					$value_fork != $value_base;
+				if ($someone_else_changed_it) {
+					if ($value == $value_fork) {
+						// we might as well not have
+						$we_changed_it = false;
+					} else {
+						$forked = true;
+					}
+				}
+			}
+			if (!$we_changed_it) {
+				$doit = false;// nothing to do
+			}
+		}
+		if ($doit) {
+			return $this->setConf($key, $value);
+		}
+		if ($forked) {
+			return $value_fork;
+		}
+	}
+}