1 files changed, 117 insertions, 0 deletions
diff --git a/ext/bg/js/conditions.js b/ext/bg/js/conditions.js
new file mode 100644
index 00000000..ed4b14f5
--- /dev/null
+++ b/ext/bg/js/conditions.js
@@ -0,0 +1,117 @@
+/*
+ * Copyright (C) 2019  Alex Yatskov <alex@foosoft.net>
+ * Author: Alex Yatskov <alex@foosoft.net>
+ *
+ * This program 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 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+
+function conditionsValidateOptionValue(object, value) {
+    if (object.hasOwnProperty('validate') && !object.validate(value)) {
+        throw new Error('Invalid value for condition');
+    }
+
+    if (object.hasOwnProperty('transform')) {
+        value = object.transform(value);
+
+        if (object.hasOwnProperty('validateTransformed') && !object.validateTransformed(value)) {
+            throw new Error('Invalid value for condition');
+        }
+    }
+
+    return value;
+}
+
+function conditionsNormalizeOptionValue(descriptors, type, operator, optionValue) {
+    if (!descriptors.hasOwnProperty(type)) {
+        throw new Error('Invalid type');
+    }
+
+    const conditionDescriptor = descriptors[type];
+    if (!conditionDescriptor.operators.hasOwnProperty(operator)) {
+        throw new Error('Invalid operator');
+    }
+
+    const operatorDescriptor = conditionDescriptor.operators[operator];
+
+    let transformedValue = conditionsValidateOptionValue(conditionDescriptor, optionValue);
+    transformedValue = conditionsValidateOptionValue(operatorDescriptor, transformedValue);
+
+    if (operatorDescriptor.hasOwnProperty('transformReverse')) {
+        transformedValue = operatorDescriptor.transformReverse(transformedValue);
+    }
+    return transformedValue;
+}
+
+function conditionsTestValueThrowing(descriptors, type, operator, optionValue, value) {
+    if (!descriptors.hasOwnProperty(type)) {
+        throw new Error('Invalid type');
+    }
+
+    const conditionDescriptor = descriptors[type];
+    if (!conditionDescriptor.operators.hasOwnProperty(operator)) {
+        throw new Error('Invalid operator');
+    }
+
+    const operatorDescriptor = conditionDescriptor.operators[operator];
+    if (operatorDescriptor.hasOwnProperty('transform')) {
+        if (operatorDescriptor.hasOwnProperty('transformCache')) {
+            const key = `${optionValue}`;
+            const transformCache = operatorDescriptor.transformCache;
+            if (transformCache.hasOwnProperty(key)) {
+                optionValue = transformCache[key];
+            } else {
+                optionValue = operatorDescriptor.transform(optionValue);
+                transformCache[key] = optionValue;
+            }
+        } else {
+            optionValue = operatorDescriptor.transform(optionValue);
+        }
+    }
+
+    return operatorDescriptor.test(value, optionValue);
+}
+
+function conditionsTestValue(descriptors, type, operator, optionValue, value) {
+    try {
+        return conditionsTestValueThrowing(descriptors, type, operator, optionValue, value);
+    } catch (e) {
+        return false;
+    }
+}
+
+function conditionsClearCaches(descriptors) {
+    for (const type in descriptors) {
+        if (!descriptors.hasOwnProperty(type)) {
+            continue;
+        }
+
+        const conditionDescriptor = descriptors[type];
+        if (conditionDescriptor.hasOwnProperty('transformCache')) {
+            conditionDescriptor.transformCache = {};
+        }
+
+        const operatorDescriptors = conditionDescriptor.operators;
+        for (const operator in operatorDescriptors) {
+            if (!operatorDescriptors.hasOwnProperty(operator)) {
+                continue;
+            }
+
+            const operatorDescriptor = operatorDescriptors[operator];
+            if (operatorDescriptor.hasOwnProperty('transformCache')) {
+                operatorDescriptor.transformCache = {};
+            }
+        }
+    }
+}