jkeymagic.engine.inputProcessor.js

JKME.engine.prototype.processKeyEvent = function (e) {

    log('processKeyEvent', e, this);
    if (this.env.opera) {
        if (e.keyCode >= 33 && e.keyCode <= 40) {
            return;
        }
    }
    
    if (this.on === false) return;
    
    var target = this.env.ie ? e.srcElement : e.target;
    var eat = false;
    var sel = this.getInputSelection(target);
    var _new_context = target.value.substr(0, sel.start);
    var _after_context = target.value.substr(sel.end, target.value.length);
    
    if (this.context != _new_context ) {
        this.reset();
        this.context = _new_context;
    }

    var oldText = this.context;
    
    var code = this.getKeyCode(e);
    
    var modifiers = {
        shift: code.shift,
        alt: e.altKey,
        ctrl: e.ctrlKey,
        cmd: e.metaKey == undefined ? false : e.metaKey
    }
    
    var success = this.processInput(code.keycode, String.fromCharCode(this.env.ie | this.env.opera ? e.keyCode : e.charCode), modifiers);
    
    if (!success && code.keycode) {
        this.switches = {};
    }
    var looped = 0;
    if (success) {
        while (success) {
            if (this.shouldMatchAgain) {
                modifiers = {
                    shift: false,
                    alt: false,
                    ctrl: false,
                    cmd: false
                }
                success = this.processInput(0, "", modifiers);
                
                looped++;
                if (looped == 20) {
                    error('Max loop exceeded.')
                    return;
                }
                if (!success) {
                    this.updateHistory(oldText);
                    break;
                } else if (e.keyCode == 8 && this.contextHistory.length) {
                    if (this.context == this.contextHistory[this.contextHistory.length]) { // if results are the same
                        this.contextHistory.pop(); // sync with smartbackspace
                    } else {
                        this.contextHistory = new Array();
                    }
                }
            } else if (e.keyCode == 8 && this.contextHistory.length) {
                    if (this.context == this.contextHistory[this.contextHistory.length]) { // if results are the same
                        mthis.contextHistory.pop(); // sync with smartbackspace
                    } else {
                        this.contextHistory = new Array();
                    }
                    break;
            } else {
                this.updateHistory(oldText);
                break;
            }
        }
        this.commit(target, _after_context);
        if (e.preventDefault) e.preventDefault();
        return false;
    
    } else {
        if (modifiers.alt || modifiers.ctrl || modifiers.cmd) {
            return;
        }
        
        if (e.keyCode == 8) {
            if (this.keyboard['autobksp'] == true && this.contextHistory.length != 0) {
                this.context = this.contextHistory[this.contextHistory.length - 1];
                this.contextHistory.pop();  
                this.commit(target, _after_context);
                if (e.preventDefault) e.preventDefault();
                return false;
            } else if (this.context.length) {
                this.context = this.context.substr(0, this.context.length - 1);
                this.contextHistory = [];
            }
            return true;
        }

        if (e.charCode <= 0x20 || e.keyCode <= 0x20) {
            return;
        } else if (this.keyboard['eat']) {
            log('eaten')
            if (e.preventDefault)
                e.preventDefault();
            return false;
        } else {
            log('not eaten')
            this.context += String.fromCharCode(this.env.ie | this.env.opera ? e.keyCode : e.charCode);
            this.updateHistory(oldText);
        }
    }
}

JKME.engine.prototype.updateHistory =  function (text) {
    if (this.contextHistory.length == 0) {
        this.contextHistory.push(text);
    } else if (text != this.contextHistory[this.contextHistory.length - 1]) {
        this.contextHistory.push(text);
    }
}

JKME.engine.prototype.getKeyCode = function (e) {
    var
        keycode = 0,
        shift = false;
    var charCode = this.env.ie | this.env.opera ? e.keyCode : e.charCode;
    
    log('getKeyCode', keycode, shift);
    
    if (charCode >= 0x41 && charCode <= 0x5a) {
        shift = true;
        keycode = charCode;
    } else if (charCode >= 0x61 && charCode <= 0x7a) {
        keycode = charCode - 0x20;
    } else if (charCode >= 0x30  && charCode <= 0x39) {
        keycode = charCode;
    } else {
        switch (charCode) {
            case 0x60: keycode = 0xc0; break;
            case 0x7e: keycode = 0xc0; shift = true; break;
            
            case 0x21: keycode = 0x31; shift = true; break;
            case 0x40: keycode = 0x32; shift = true; break;
            case 0x23: keycode = 0x33; shift = true; break;
            case 0x24: keycode = 0x34; shift = true; break;
            case 0x25: keycode = 0x35; shift = true; break;
            case 0x5e: keycode = 0x36; shift = true; break;
            case 0x26: keycode = 0x37; shift = true; break;
            case 0x2a: keycode = 0x38; shift = true; break;
            case 0x28: keycode = 0x39; shift = true; break;
            case 0x29: keycode = 0x30; shift = true; break;
            
            case 0x2d: keycode = 0xbd; break;
            case 0x5f: keycode = 0xbd; shift = true; break;
            
            case 0x3d: keycode = 0xbb; break;
            case 0x2b: keycode = 0xbb; shift = true; break;
            
            case 0x5b: keycode = 0xdb; break;
            case 0x7b: keycode = 0xdb; shift = true; break;
            
            case 0x5d: keycode = 0xdd; break;
            case 0x7d: keycode = 0xdd; shift = true; break;
            
            case 0x5c: keycode = 0xdc; break;
            case 0x7c: keycode = 0xdc; shift = true; break;
            
            case 0x3b: keycode = 0xba; break;
            case 0x3a: keycode = 0xba; shift = true; break;
            
            case 0x27: keycode = 0xde; break;
            case 0x22: keycode = 0xde; shift = true; break;
            
            case 0x2c: keycode = 0xbc; break;
            case 0x3c: keycode = 0xbc; shift = true; break;
            
            case 0x2e: keycode = 0xbe; break;
            case 0x3e: keycode = 0xbe; shift = true; break;
            
            case 0x2f: keycode = 0xbf; break;
            case 0x3f: keycode = 0xbf; shift = true; break;
            default:
                keycode = e.keyCode;
            break;
        }
    }
    log('getKeyCode', keycode, shift);
    return {keycode: keycode, shift: shift};
}

JKME.engine.prototype.processInput = function (keyCode, keyValue, modifiers) {
    log('processInput', keyCode, keyValue, modifiers);
    for (var ruleIdx in this.keyboard['rules']) {
        var rule = this.keyboard['rules'][ruleIdx];
        if (this.matchRule(rule, keyCode, keyValue, modifiers)) {
            log('matchRule=true', rule);
            if (this.matchedVK === false) {
                this.context += keyValue
            }
            if (keyCode) {
                this.switches = {};
            }
            var success = this.processOutput(rule);
            log('processOutput='+success, this.context);
            return success;
        }
    }
    return false;
}

JKME.engine.prototype.processOutput = function (rule) {
    var
        length = rule.length,
        outputResult = "",
        idx;
    
    for (itemIdx in rule['rhs']) {
        var item = rule['rhs'][itemIdx];
        switch (item['type']) {
            case tString: //string
                
                outputResult += item['value'];
                break;
            case tBackRefString:
                
                if (this.backRef.length <= item['index']) {
                    continue;
                }
                idx = rule['lhs'][item['index']]['value'].indexOf(this.backRef[item['index']]);
                if (idx != -1) {
                    outputResult += item['value'].charAt(idx);
                }
                break;
            case tReference:
                
                if (this.backRef.length <= item['index']) {
                    continue;
                }
                outputResult += this.backRef[item['index']];
                break;
            case tVKey:
                
                outputResult += String.fromCharCode(item['keyCode']);
                break;
            case tSwitch:
                log('switch' +item['switchId']);
                if (this.switches[item['switchId']] !== undefined) {
                    this.switches[item['switchId']] = !this.switches[item['switchId']];
                } else {
                    this.switches[item['switchId']] = true;
                }
                break;
        }
    }
    log(this, this.context, outputResult);
    this.context = this.context.substr(0, this.context.length - length);
    this.context += outputResult;
    
    if (outputResult.length == 0 || (outputResult.length == 1 && outputResult.charCodeAt(0) > 0x20 && outputResult.charCodeAt(0) < 0x7F)) {
        this.shouldMatchAgain = false;
    } else {
        this.shouldMatchAgain = true;
    }

    return true;

}

JKME.engine.prototype.matchKeyStates = function (keyCode, modifiers, rule) {
    var
        matchedCount = 0,
        _modifiers = {
            shift : modifiers.shift,
            ctrl : modifiers.ctrl,
            alt : modifiers.alt,
            cmd : modifiers.cmd
        };
    for (var itemIdx in rule) {
        var item = rule[itemIdx];
        if (item['type'] == tVKey) {
            switch (item['keyCode']) {
                case 0x10:
                    if (_modifiers.shift == true) {
                        _modifiers.shift = false;
                    } else {
                        return -1;
                    }
                break;
                case 0x11:
                    if (_modifiers.ctrl == true) {
                        _modifiers.ctrl = false;
                    } else {
                        return -1;
                    }
                break;
                case 0x12:
                    if (_modifiers.alt == true) {
                        _modifiers.alt = false;
                    } else {
                        return -1;
                    }
                break;
                default:
                if (item['keyCode'] != keyCode) {
                    return -1;
                }
            }
            matchedCount++
        }
    }
    
    if (_modifiers.ctrl == true || _modifiers.alt == true || _modifiers.cmd == true) {
        
        return -1;
    }
    
    return matchedCount;
}

JKME.engine.prototype.matchRule = function (rule, keyCode, keyValue, modifiers) {
    
    var appendedContext = this.context;
    this.matchedVK = false;
    var kcode = this.matchKeyStates(keyCode, modifiers, rule['lhs']);
    if (kcode == -1) {
        
        return false;
    } else if (kcode == 0) {
        if (keyValue != "") appendedContext += keyValue
    } else {
        this.matchedVK = true;
    }
    
    var 
        lenToMatch = rule['length'],
        lenAppended = appendedContext.length;
        
    if (lenToMatch > lenAppended) {
        
        return false;
    }
    
    var 
        stringToMatch = appendedContext.substr(lenAppended - lenToMatch),
        stringToMatchIdx = 0; 
    
    this.backRef = new Array();
        
    for (var itemIdx in rule['lhs']) {
        var
            item = rule['lhs'][itemIdx],
            found = false,
            idx = 0,
            curChar = stringToMatch.charAt(stringToMatchIdx);
            
        switch (item['type']) {
            case tString: //string
                
                for (var i = 0; i < item['value'].length; i++) {
                    var c = item['value'].charAt(i);
                    if (stringToMatchIdx == stringToMatch.length) {
                        
                        return false;
                    }
                    if (c != curChar) {
                        
                        return false;
                    }
                    curChar = stringToMatch.charAt(++stringToMatchIdx);
                }
                
                this.backRef.push(item['value']);
                break;
            case tAnyOfString:
                
                if (item['value'].indexOf(curChar) == -1) {
                    
                    return false;
                } else {
                    
                    this.backRef.push(curChar);
                    stringToMatchIdx++;
                }
                break;
            case tNotOfString:
                
                if (item['value'].indexOf(curChar) != -1) {
                    
                    return false;
                } else {
                    
                    this.backRef.push(curChar);
                    stringToMatchIdx++;
                }
                break;
            case tAny:
                
                var c = stringToMatch.charAt(stringToMatchIdx++);
                if ( (c >= '\u0021' && c <= '\u007D') || (c >= '\u00FF' && c < '\uFFFF') ) {
                    stringToMatchIdx++;
                } else {
                    
                    return false;
                }
                this.backRef.push(c);
                
                break;
            case tSwitch:
                if (this.switches[item['switchId']] !== undefined) {
                    if (!this.switches[item['switchId']]) {
                        return false;
                    }
                } else {
                    return false;
                }
                break;
        }
    }
    
    return true;
}