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Add ability to handle digraphs in gesture and tap typing 

Example: Gesture the German word "ueber" and the system will now replace
the transliteration "ue" with the correct u-umlaut.

Bug: 8493920
Change-Id: I03e1d6311b4187b6c7f802d8fef43a50eee12721
main
Tom Ouyang 2013-04-05 16:30:34 -07:00 committed by Android (Google) Code Review
parent b6e1777d4b
commit fd9f3d97ae
2 changed files with 25 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

28
native/jni/src/suggest/core/suggest.cpp
View File

@ -18,6 +18,7 @@
#include "char_utils.h"
#include "dictionary.h"
#include "digraph_utils.h"
#include "proximity_info.h"
#include "suggest/core/dicnode/dic_node.h"
#include "suggest/core/dicnode/dic_node_priority_queue.h"
@ -221,7 +222,7 @@ int Suggest::outputSuggestions(DicTraverseSession *traverseSession, int *frequen
void Suggest::expandCurrentDicNodes(DicTraverseSession *traverseSession) const {
const int inputSize = traverseSession->getInputSize();
DicNodeVector childDicNodes(TRAVERSAL->getDefaultExpandDicNodeSize());
DicNode omissionDicNode;
DicNode correctionDicNode;
// TODO: Find more efficient caching
const bool shouldDepthLevelCache = TRAVERSAL->shouldDepthLevelCache(traverseSession);
@ -257,7 +258,10 @@ void Suggest::expandCurrentDicNodes(DicTraverseSession *traverseSession) const {
dicNode.setCached();
}
if (isLookAheadCorrection) {
if (dicNode.isInDigraph()) {
// Finish digraph handling if the node is in the middle of a digraph expansion.
processDicNodeAsDigraph(traverseSession, &dicNode);
} else if (isLookAheadCorrection) {
// The algorithm maintains a small set of "deferred" nodes that have not consumed the
// latest touch point yet. These are needed to apply look-ahead correction operations
// that require special handling of the latest touch point. For example, with insertions
@ -291,12 +295,18 @@ void Suggest::expandCurrentDicNodes(DicTraverseSession *traverseSession) const {
processDicNodeAsMatch(traverseSession, childDicNode);
continue;
}
if (DigraphUtils::hasDigraphForCodePoint(traverseSession->getDictFlags(),
childDicNode->getNodeCodePoint())) {
correctionDicNode.initByCopy(childDicNode);
correctionDicNode.advanceDigraphIndex();
processDicNodeAsDigraph(traverseSession, &correctionDicNode);
}
if (allowsErrorCorrections
&& TRAVERSAL->isOmission(traverseSession, &dicNode, childDicNode)) {
// TODO: (Gesture) Change weight between omission and substitution errors
// TODO: (Gesture) Terminal node should not be handled as omission
omissionDicNode.initByCopy(childDicNode);
processDicNodeAsOmission(traverseSession, &omissionDicNode);
correctionDicNode.initByCopy(childDicNode);
processDicNodeAsOmission(traverseSession, &correctionDicNode);
}
const ProximityType proximityType = TRAVERSAL->getProximityType(
traverseSession, &dicNode, childDicNode);
@ -400,6 +410,16 @@ void Suggest::processDicNodeAsSubstitution(DicTraverseSession *traverseSession,
processExpandedDicNode(traverseSession, childDicNode);
}
// Process the node codepoint as a digraph. This means that composite glyphs like the German
// u-umlaut is expanded to the transliteration "ue". Note that this happens in parallel with
// the normal non-digraph traversal, so both "uber" and "ueber" can be corrected to "[u-umlaut]ber".
void Suggest::processDicNodeAsDigraph(DicTraverseSession *traverseSession,
DicNode *childDicNode) const {
weightChildNode(traverseSession, childDicNode);
childDicNode->advanceDigraphIndex();
processExpandedDicNode(traverseSession, childDicNode);
}
/**
* Handle the dicNode as an omission error (e.g., ths => this). Skip the current letter and consider
* matches for all possible next letters. Note that just skipping the current letter without any

1
native/jni/src/suggest/core/suggest.h
View File

@ -64,6 +64,7 @@ class Suggest : public SuggestInterface {
void generateFeatures(
DicTraverseSession *traverseSession, DicNode *dicNode, float *features) const;
void processDicNodeAsOmission(DicTraverseSession *traverseSession, DicNode *dicNode) const;
void processDicNodeAsDigraph(DicTraverseSession *traverseSession, DicNode *dicNode) const;
void processDicNodeAsTransposition(DicTraverseSession *traverseSession,
DicNode *dicNode) const;
void processDicNodeAsInsertion(DicTraverseSession *traverseSession, DicNode *dicNode) const;