feat: open-source 小浣熊阅读 for iOS

Tests/LegadoCoreTests/RuleExpressionParserTests.swift

@@ -0,0 +1,32 @@
+import Testing
+@testable import LegadoCore
+
+struct RuleExpressionParserTests {
+    private let parser = RuleExpressionParser()
+
+    @Test func detectsModesAndReplacement() throws {
+        let plan = try parser.parse("@Json:$.book.name##\\s+## ")
+
+        #expect(plan.combination == .single)
+        #expect(plan.branches.count == 1)
+        #expect(plan.branches[0].mode == .jsonPath)
+        #expect(plan.branches[0].expression == "$.book.name")
+        #expect(plan.branches[0].replacePattern == "\\s+")
+        #expect(plan.branches[0].replacement == " ")
+    }
+
+    @Test func doesNotSplitOperatorsInsideJSONPathFilter() throws {
+        let plan = try parser.parse("$.books[?(@.enabled && @.score > 1)]||$.fallback")
+
+        #expect(plan.combination == .fallback)
+        #expect(plan.branches.count == 2)
+        #expect(plan.branches[0].expression.contains("&&"))
+    }
+
+    @Test func rejectsUnbalancedRules() {
+        #expect(throws: RuleEngineError.self) {
+            try parser.parse("$.books[0")
+        }
+    }
+}
+