"{ Package: 'jv:smallsense' }"

"{ NameSpace: SmallSense }"

EditTextViewCompletionSupport subclass:#CompletionController

	instanceVariableNames:'support seqno completeIfUnambiguous'

	classVariableNames:''

	poolDictionaries:''

	category:'SmallSense-Core'

!

!CompletionController class methodsFor:'instance creation'!

new

    "return an initialized instance"

    ^ self basicNew initialize.

! !

!CompletionController class methodsFor:'testing'!

isAbstract

    ^ false

    "Created: / 17-10-2013 / 00:29:49 / Jan Vrany <jan.vrany@fit.cvut.cz>"

! !

!CompletionController methodsFor:'accessing'!

support

    ^ support

!

support:anEditSupport

    support := anEditSupport.

! !

!CompletionController methodsFor:'events'!

handleKeyPress:key x:x y:y

    key == #Control_L ifTrue:[

        completionView notNil ifTrue:[

            ^ false.

        ].

    ].

    key == #CodeCompletion  ifTrue: [

        autoSelect := true.    

        self startCompletionProcess.

        ^ true

    ].

    (key == #BackSpace or:[key == #BasicBackspace]) ifTrue:[

        | c |

        c := editView characterBeforeCursor.

        (c notNil and:[c isAlphaNumeric]) ifTrue:[

             ^ false

        ].

    ].     

    completionView notNil ifTrue:[

        (key == #Return and:[completionView hasSelection]) ifTrue:[

            self complete.

            ^ true.

        ].

        key == #Tab ifTrue:[ 

            self handleKeyPressTab.  

            ^ true

        ].

        key isCharacter ifTrue:[

            self updateSelection.

        ].

    ].

    ^ super handleKeyPress:key x:x y:y

    "Created: / 27-09-2013 / 15:38:44 / Jan Vrany <jan.vrany@fit.cvut.cz>"

    "Modified: / 31-03-2014 / 22:55:01 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

handleKeyPressTab

    "Tab has been pressed, try to complete longest common prefix"

    | prefix matching longest minlen |

    prefix := support wordBeforeCursor string.                                        

    matching := OrderedCollection new.

    minlen := SmallInteger maxVal.

    completionView list do:[:po |

        | s |

        s := po stringToComplete.

        (s startsWith: prefix) ifTrue:[

            matching add: po -> s.

            minlen := minlen min: s size.

        ].

    ].

    matching isEmpty ifTrue:[

        completionView flash.

        ^self.

    ].

    matching size == 1 ifTrue:[

        self complete: matching first key.

    ].

    longest := String streamContents:[:s |

        | i |

        s nextPutAll: prefix.

        i := prefix size + 1.

        [ i <= minlen ] whileTrue:[

            | c |

            c := matching first value at: i.

            (matching allSatisfy:[:e|(e value at: i) == c]) ifTrue:[

                s nextPut:c.

                i := i + 1.

            ] ifFalse:[

                "/ terminate the loop    

                i := minlen + 2.

            ]

        ]

    ].

    longest size = prefix size ifTrue:[

        completionView flash.

        ^self.

    ].

    editView insertStringAtCursor:(longest copyFrom: prefix size + 1).

    "Created: / 31-03-2014 / 22:55:01 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

postKeyPress:key

    seqno := seqno + 1.

    seqno == SmallInteger maxVal ifTrue:[

        seqno := 0.

    ].

    UserPreferences current immediateCodeCompletion ifFalse:[

        "/ only update, if already open

        completionView isNil ifTrue:[^ self].

    ].

    (key == #BackSpace or:[key == #BasicBackspace]) ifTrue:[

        self closeCompletionView.

        ^ self

    ].

    key isCharacter ifTrue:[

        key isLetterOrDigit not ifTrue:[

            self closeCompletionView

        ] ifFalse:[

            | c |

            c := editView characterBeforeCursor.

            (c notNil and:[c isLetterOrDigit]) ifTrue:[

                c := editView characterUnderCursor.

                c isSeparator ifTrue:[

                    autoSelect := false.

                    self updateCompletionList.

                ].

            ]

        ].

        ^ self

    ].

    "Created: / 28-09-2013 / 00:21:00 / Jan Vrany <jan.vrany@fit.cvut.cz>"

    "Modified: / 03-10-2013 / 11:01:21 / Jan Vrany <jan.vrany@fit.cvut.cz>"

! !

!CompletionController methodsFor:'initialization'!

initialize

    "Invoked when a new instance is created."

    "/ please change as required (and remove this comment)

    "/ support := nil.

    seqno := 0.

    completeIfUnambiguous := UserPreferences current smallSenseCompleteIfUnambiguous.

    "/ super initialize.   -- commented since inherited method does nothing

    "Modified: / 18-01-2014 / 23:10:49 / Jan Vrany <jan.vrany@fit.cvut.cz>"

! !

!CompletionController methodsFor:'private'!

complete

    self complete: completionView selection.

    "Created: / 27-09-2013 / 15:38:44 / Jan Vrany <jan.vrany@fit.cvut.cz>"

    "Modified: / 31-03-2014 / 23:22:12 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

complete: item

    self closeCompletionView.

    item insert

    "Created: / 31-03-2014 / 23:21:58 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

stopCompletionProcess

    "kill any background completion process"

    editView sensor flushUserEventsFor: self.     

    super stopCompletionProcess

    "Created: / 02-10-2013 / 15:09:58 / Jan Vrany <jan.vrany@fit.cvut.cz>"

    "Modified: / 03-10-2013 / 11:03:01 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

updateCompletionList

    "called for keypress events"

    completionView isNil ifTrue:[

        super updateCompletionList

    ] ifFalse:[

         self updateSelection.

    ].

    "Created: / 27-09-2013 / 15:58:01 / Jan Vrany <jan.vrany@fit.cvut.cz>"

    "Modified: / 28-09-2013 / 00:15:56 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

updateSelection

    "Updates selection in completion view based on

     currently typed partial text. Return true if

     the complection window should be closed or false

     if it shall be kept open."

    list := completionView list.

    prefix := support wordBeforeCursor.

    matches1 notEmptyOrNil ifTrue:[

        matches1 size == 1 ifTrue:[

            completionView selection:  matches1 anElement.

            completeIfUnambiguous ifTrue:[

                self complete.

                ^ true

            ].

        ] ifFalse:[

            | selection |

            selection := matches1 inject: matches1 anElement into:[:mostrelevant :each |

                each relevance > mostrelevant relevance 

                    ifTrue:[each]

                    ifFalse:[mostrelevant]

            ].

            completionView selection: selection.

    ].

    matches2 notEmptyOrNil ifTrue:[

        matches2 size == 1 ifTrue:[

            completionView selection:  matches2 anElement.

        ] ifFalse:[

            | selection |

            selection := matches2 inject: matches2 anElement into:[:mostrelevant :each |

                each relevance > mostrelevant relevance 

                    ifTrue:[each]

                    ifFalse:[mostrelevant]

            ].

            completionView selection: selection.

        ]

    ] ifFalse:[

        completionView selection: nil.

    ].

    ^ false.

    "Created: / 27-09-2013 / 16:16:18 / Jan Vrany <jan.vrany@fit.cvut.cz>"

! !

!CompletionController methodsFor:'private-API'!

closeCompletionView

    |v|

    self stopCompletionProcess.

    (v := completionView) notNil ifTrue:[

        completionView := nil.

        "/ let it close itself - avoids synchronization problems

        v sensor

            pushUserEvent:#value

            for:[ v topView destroy ].

    ].

    "Created: / 02-10-2013 / 13:57:27 / Jan Vrany <jan.vrany@fit.cvut.cz>"

    "Modified: / 04-10-2013 / 21:14:06 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

computeCompletions

    "Actually compute the completions and update the completion view."  

    | completions |

    editView sensor flushUserEventsFor: self.

    "/ Wait a while to give user chance finish typing.

    "/ This also reduces CPU consumption by avoiding

    "/ useless computation

    Delay waitForMilliseconds: 200. 

"/    self updateCompletions: support computeCompletion

    completions := support computeCompletion.

    completions notEmptyOrNil ifTrue:[

        editView sensor pushUserEvent: #updateCompletions:sequence: for: self withArguments: (Array with: completions with: seqno)

    ].

    "Created: / 27-09-2013 / 13:12:11 / Jan Vrany <jan.vrany@fit.cvut.cz>"

    "Modified: / 03-10-2013 / 07:17:10 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

openCompletionView

    self openCompletionView: #()

    "Created: / 27-09-2013 / 16:17:58 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

openCompletionView: list

    "Makes sure the completion view is opened and with given `list`."

    | movePos topView x y  windowExtent screenExtent |

    "/ move the window

    list isEmpty ifTrue:[ ^ self ].

    list = #( 'Busy...' ) ifTrue:[ ^ self ].  

    x := (editView xOfCol:editView cursorCol  inVisibleLine:editView cursorLine)

            - 16"icon" - (editView widthOfString:  support wordBeforeCursor) - 5"magic constant".

    y := editView yOfCursor + editView font maxHeight + 3.

    movePos := (editView originRelativeTo: nil) + (x @ y).

    completionView isNil ifTrue:[

        completionView := CompletionView new.

        completionView completionController: self.  

        completionView list:list.

        completionView font: editView font.

        topView := completionView.

        windowExtent := completionView extent copy.

        screenExtent := Screen current monitorBoundsAt: movePos.

        (screenExtent height) < (movePos y + windowExtent y) ifTrue:[

            movePos y: (movePos y - windowExtent y - editView font maxHeight - 5).

        ].

        topView origin:movePos.

"/        topView resizeToFit.

        self updateSelection ifFalse:[

            topView open.

        ].

    ] ifFalse:[

        completionView list:list.

        self updateSelection.

"/        topView := completionView topView.

"/        topView ~~ completionView ifTrue:[

"/            topView origin:movePos.

"/            topView resizeToFit.

"/        ]

    ].

    "Created: / 27-09-2013 / 14:01:27 / Jan Vrany <jan.vrany@fit.cvut.cz>"

    "Modified: / 27-02-2014 / 10:13:24 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

updateCompletions: completionResult sequence: sequence

    seqno == sequence ifTrue:[

        self openCompletionView: completionResult 

    ].

    "Created: / 03-10-2013 / 07:14:06 / Jan Vrany <jan.vrany@fit.cvut.cz>"

    "Modified: / 03-10-2013 / 11:02:12 / Jan Vrany <jan.vrany@fit.cvut.cz>"

! !

!CompletionController class methodsFor:'documentation'!

version_HG

    ^ '$Changeset: <not expanded> $'

! !