[WIP] predict next words

Author: dongyuwei

src/InputController.h

@@ -5,6 +5,7 @@
 #import "ConversionEngine.h"
 
 @interface InputController : IMKInputController {
+    NSMutableString *_sentenceBuffer;
     NSMutableString *_composedBuffer;
     NSMutableString *_originalBuffer;
     NSInteger _insertionIndex;
@@ -17,6 +18,9 @@
     AnnotationWinController *_annotationWin;
 }
 
+- (NSMutableString *)sentenceBuffer;
+- (void)setSentenceBuffer:(NSString *)string;
+
 - (NSMutableString *)composedBuffer;
 - (void)setComposedBuffer:(NSString *)string;
 - (NSMutableString *)originalBuffer;

src/InputController.mm

@@ -173,6 +173,7 @@ - (BOOL)onKeyEvent:(NSEvent *)event client:(id)sender {
         if (hasBufferedText) {
             [self appendToComposedBuffer:characters];
             [self commitCompositionWithoutSpace:sender];
+            [self setSentenceBuffer: @""];
             return YES;
         }
     }
@@ -228,6 +229,27 @@ - (void)commitComposition:(id)sender {
     [sender insertText:text replacementRange:NSMakeRange(NSNotFound, NSNotFound)];
 
     [self reset];
+    
+    NSLog(@"Current Sentence Buffer: %@", self.sentenceBuffer);
+    if ([self doesSentenceBufferIncludeSpace]) {
+        [self fetchPredictionsForText:self.sentenceBuffer completion:^(NSDictionary *responseDict, NSArray *bertArray, NSError *error) {
+            if (error) {
+                NSLog(@"Error: %@", error.localizedDescription);
+            } else {
+                NSLog(@"BERT: %@", bertArray);
+                dispatch_async(dispatch_get_main_queue(), ^{
+                    [sharedCandidates setCandidateData:bertArray];
+                    [sharedCandidates show:kIMKLocateCandidatesBelowHint];
+                });
+            }
+        }];
+    }
+    
+}
+
+- (BOOL)doesSentenceBufferIncludeSpace {
+    NSRange range = [self.sentenceBuffer rangeOfString:@" "];
+    return range.location != NSNotFound;
 }
 
 - (void)commitCompositionWithoutSpace:(id)sender {
@@ -242,6 +264,66 @@ - (void)commitCompositionWithoutSpace:(id)sender {
     [self reset];
 }
 
+- (NSString *) fetchAPIURL {
+    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
+    NSString *apiURL = [defaults stringForKey:@"NEXT_WORD_PREDICTION_SERVICE_URL"];
+    if (apiURL) {
+        return apiURL;
+    } else {
+        return @"http://127.0.0.1:8080/get_end_predictions";
+    }
+}
+
+- (void)fetchPredictionsForText:(NSString *)text completion:(void(^)(NSDictionary *responseDict, NSArray *bertArray, NSError *error))completionHandler {
+    NSString *urlString = [self fetchAPIURL];
+    NSURL *url = [NSURL URLWithString:urlString];
+    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
+    request.HTTPMethod = @"POST";
+    [request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
+
+    NSDictionary *jsonBody = @{@"input_text": text, @"top_k": @"9"};
+    NSError *jsonError;
+    NSData *jsonData = [NSJSONSerialization dataWithJSONObject:jsonBody options:0 error:&jsonError];
+
+    if (jsonError) {
+        completionHandler(nil, nil, jsonError);
+        return;
+    }
+
+    request.HTTPBody = jsonData;
+
+    NSURLSession *session = [NSURLSession sharedSession];
+    NSURLSessionDataTask *task = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
+        if (error) {
+            completionHandler(nil, nil, error);
+            return;
+        }
+
+        NSError *jsonParsingError;
+        NSDictionary *responseDict = [NSJSONSerialization JSONObjectWithData:data options:0 error:&jsonParsingError];
+
+        if (jsonParsingError) {
+            completionHandler(nil, nil, jsonParsingError);
+        } else {
+            NSArray *bertArray = nil;
+            NSArray *bertCNArray = nil;
+
+            // Parsing the bert string
+            NSString *bertString = [responseDict objectForKey:@"bert"];
+            if (bertString) {
+                bertArray = [bertString componentsSeparatedByString:@"\n"];
+                bertArray = [bertArray filteredArrayUsingPredicate:[NSPredicate predicateWithBlock:^BOOL(id evaluatedObject, NSDictionary *bindings) {
+                    return [evaluatedObject length] > 0 && ![evaluatedObject isEqualToString:@"[UNK]"];
+                }]];
+            }
+
+            completionHandler(responseDict, bertArray, nil);
+        }
+    }];
+
+    [task resume];
+}
+
 - (void)reset {
     [self setComposedBuffer:@""];
     [self setOriginalBuffer:@""];
@@ -264,6 +346,22 @@ - (NSMutableString *)composedBuffer {
 
 - (void)setComposedBuffer:(NSString *)string {
     NSMutableString *buffer = [self composedBuffer];
+    if (string && string.length > 0) {
+        NSString * sentence = self.sentenceBuffer;
+        [self setSentenceBuffer: [NSString stringWithFormat:@"%@ %@", sentence, string]];
+    }
+    [buffer setString:string];
+}
+
+- (NSMutableString *)sentenceBuffer {
+    if (_sentenceBuffer == nil) {
+        _sentenceBuffer = [[NSMutableString alloc] init];
+    }
+    return _sentenceBuffer;
+}
+
+- (void)setSentenceBuffer:(NSString *)string {
+    NSMutableString *buffer = [self sentenceBuffer];
     [buffer setString:string];
 }