Adds an example for a symbol table in tree structure.

Source/InputMethodController.swift

@@ -575,6 +575,17 @@ extension McBopomofoInputMethodController: CandidateControllerDelegate {
     func candidateController(_ controller: CandidateController, didSelectCandidateAtIndex index: UInt) {
         let client = currentCandidateClient
 
+        if let state = state as? InputState.SymbolTable,
+           let node = state.node.children?[Int(index)] {
+            if let children = node.children, !children.isEmpty {
+                self.handle(state: .SymbolTable(node: node, useVerticalMode: state.useVerticalMode), client: currentCandidateClient)
+            } else {
+                self.handle(state: .Committing(poppedText: node.title), client: client)
+                self.handle(state: .Empty(), client: client)
+            }
+            return
+        }
+
         if let state = state as? InputState.ChoosingCandidate {
             let selectedValue = state.candidates[Int(index)]
             keyHandler.fixNode(value: selectedValue)
@@ -596,7 +607,10 @@ extension McBopomofoInputMethodController: CandidateControllerDelegate {
             } else {
                 handle(state: inputting, client: client)
             }
-        } else if let state = state as? InputState.AssociatedPhrases {
+            return
+        }
+
+        if let state = state as? InputState.AssociatedPhrases {
             let selectedValue = state.candidates[Int(index)]
             handle(state: .Committing(poppedText: selectedValue), client: currentCandidateClient)
             if Preferences.associatedPhrasesEnabled,

Source/InputState.swift

@@ -317,4 +317,53 @@ class InputState: NSObject {
             "<InputState.AssociatedPhrases, candidates:\(candidates), useVerticalMode:\(useVerticalMode)>"
         }
     }
+
+    @objc (InputStateSymbolTable)
+    class SymbolTable: ChoosingCandidate {
+        @objc var node: SymbolNode
+
+        @objc init(node: SymbolNode, useVerticalMode: Bool) {
+            self.node = node
+            let candidates = node.children?.map { $0.title } ?? [String]()
+            super.init(composingBuffer: "", cursorIndex: 0, candidates: candidates, useVerticalMode: useVerticalMode)
+        }
+
+        override var description: String {
+            "<InputState.SymbolTable, candidates:\(candidates), useVerticalMode:\(useVerticalMode),  composingBuffer:\(composingBuffer), cursorIndex:\(cursorIndex)>"
+        }
+    }
+
+}
+
+@objc class SymbolNode: NSObject {
+    @objc var title: String
+    @objc var children: [SymbolNode]?
+
+    @objc init(_ title: String, _ children: [SymbolNode]? = nil) {
+        self.title = title
+        self.children = children
+        super.init()
+    }
+
+    @objc init(_ title: String, symbols: String) {
+        self.title = title
+        self.children = Array(symbols).map { SymbolNode(String($0), nil) }
+        super.init()
+    }
+
+    @objc static let root: SymbolNode = SymbolNode("/", [
+        SymbolNode("…"),
+        SymbolNode("※"),
+        SymbolNode("常用符號", symbols:"，、。．？！；：‧‥﹐﹒˙·‘’“”〝〞‵′〃～＄％＠＆＃＊"),
+        SymbolNode("左右括號", symbols:"（）「」〔〕｛｝〈〉『』《》【】﹙﹚﹝﹞﹛﹜"),
+        SymbolNode("上下括號", symbols:"︵︶﹁﹂︹︺︷︸︿﹀﹃﹄︽︾︻︼"),
+        SymbolNode("希臘字母", symbols:"αβγδεζηθικλμνξοπρστυφχψωΑΒΓΔΕΖΗΘΙΚΛΜΝΞΟΠΡΣΤΥΦΧΨΩ"),
+        SymbolNode("數學符號", symbols:"＋－×÷＝≠≒∞±√＜＞﹤﹥≦≧∩∪ˇ⊥∠∟⊿㏒㏑∫∮∵∴╳﹢"),
+        SymbolNode("特殊圖形", symbols:"↑↓←→↖↗↙↘㊣◎○●⊕⊙○●△▲☆★◇◆□■▽▼§￥〒￠￡※♀♂"),
+        SymbolNode("Unicode", symbols:"♨☀☁☂☃♠♥♣♦♩♪♫♬☺☻"),
+        SymbolNode("單線框", symbols:"├─┼┴┬┤┌┐╞═╪╡│▕└┘╭╮╰╯"),
+        SymbolNode("雙線框", symbols:"╔╦╗╠═╬╣╓╥╖╒╤╕║╚╩╝╟╫╢╙╨╜╞╪╡╘╧╛"),
+        SymbolNode("填色方塊", symbols:"＿ˍ▁▂▃▄▅▆▇█▏▎▍▌▋▊▉◢◣◥◤"),
+        SymbolNode("線段", symbols:"﹣﹦≡｜∣∥–︱—︳╴¯￣﹉﹊﹍﹎﹋﹌﹏︴∕﹨╱╲／＼"),
+    ])
 }

Source/KeyHandler.mm

@@ -489,20 +489,13 @@ static NSString *const kGraphVizOutputfile = @"/tmp/McBopomofo-visualization.dot
 
     // MARK: Punctuation list
     if ((char)charCode == '`') {
-        if (_languageModel->hasUnigramsForKey("_punctuation_list")) {
-            if (_bpmfReadingBuffer->isEmpty()) {
-                _builder->insertReadingAtCursor("_punctuation_list");
-                NSString *poppedText = [self _popOverflowComposingTextAndWalk];
-                InputStateInputting *inputting = (InputStateInputting *)[self buildInputtingState];
-                inputting.poppedText = poppedText;
-                stateCallback(inputting);
-                InputStateChoosingCandidate *choosingCandidate = [self _buildCandidateState:inputting useVerticalMode:input.useVerticalMode];
-                stateCallback(choosingCandidate);
-            } else { // If there is still unfinished bpmf reading, ignore the punctuation
-                errorCallback();
-            }
-            return YES;
-        }
+        InputStateEmpty *empty = [[InputStateEmpty alloc] init];
+        stateCallback(empty);
+
+        SymbolNode *root = [SymbolNode root];
+        InputStateSymbolTable *symbolState = [[InputStateSymbolTable alloc] initWithNode:root useVerticalMode:input.useVerticalMode];
+        stateCallback(symbolState);
+        return YES;
     }
 
     // MARK: Punctuation