MediaWiki:Gadget-calculator-core.js

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/**
 * @author Chris Rishel
 */
( function() {
    /**
     * Class CalculatorObject
     *
     * @param {Object} varData
     * @param {Object} propertyData
     * @returns {Object}
     * @constructor
     */
    function CalculatorObject( varData, propertyData ) {
        if( propertyData ) {
            if( propertyData.hasOwnProperty( 'required' ) ) {
                for( var iRequiredProperty in propertyData.required ) {
                    var requiredProperty = propertyData.required[ iRequiredProperty ];

                    if( !varData.hasOwnProperty( requiredProperty ) ) {
                        console.error( 'Missing required property "' + requiredProperty + '"' );
                        console.log( varData );

                        return null;
                    }

                    this[ requiredProperty ] = varData[ requiredProperty ];
                }
            }

            if( propertyData.hasOwnProperty( 'optional' ) ) {
                for( var iOptionalProperty in propertyData.optional ) {
                    var optionalProperty = propertyData.optional[ iOptionalProperty ];

                    if( varData.hasOwnProperty( optionalProperty ) ) {
                        this[ optionalProperty ] = varData[ optionalProperty ];
                    } else {
                        this[ optionalProperty ] = null;
                    }
                }
            }
        }
    }


    /**
     * Class CalculatorVariable
     * @param {Object} varData
     * @returns {CalculatorVariable}
     * @constructor
     */
    function CalculatorVariable( varData ) {
        var propertyData = {
            required: [
                'name',
                'type'
            ],
            optional: [
                'defaultValue',
                'options',
                'units'
            ]
        };

        CalculatorObject.call( this, varData, propertyData );

        this.value = null;
    }

    CalculatorVariable.prototype = Object.create( CalculatorObject.prototype );

    CalculatorVariable.prototype.getValue = function() {
        return this.value;
    };

    CalculatorVariable.prototype.getValueString = function() {
        return String( this.value );
    };

    CalculatorVariable.prototype.hasUnits = function() {
        return this.units !== null;
    };

    CalculatorVariable.prototype.setValue = function( value ) {
        if( this.type === 'number' ) {
            if( typeof value !== 'object' ) {
                value = math.unit( value );
            }

            if( this.units ) {
                var valueUnits = value.formatUnits();

                if( !valueUnits ) {
                    throw new Error( 'Could not set value for "' + this.name + '": Value must define units' );
                } else if( this.units.indexOf( valueUnits ) === -1 ) {
                    throw new Error( 'Could not set value for "' + this.name + '": Units "' + valueUnits + '" are not valid for this variable' );
                }
            }
        }

        this.value = value;
    };


    mw.calculators = {
        variables: {},
        addVariables: function( variables ) {
            for( var varName in variables ) {
                if( mw.calculators.variables.hasOwnProperty( varName ) ) {
                    console.warn( 'Calculation variable "' + varName + '" already defined.' );
                    continue;
                }

                var varData = variables[ varName ];

                varData.name = varName;

                var calculationVariable = new CalculatorVariable( varData );

                if( calculationVariable ) {
                    mw.calculators.variables[ varName ] = calculationVariable;
                }
            }
        },
        defineUnits: function() {
            // Create aliases for abbreviations of existing units
            math.createUnit( 'dy', {
                definition: '1 day'
            } );

            math.createUnit( 'mo', {
                definition: '1 month'
            } );

            math.createUnit( 'yr', {
                definition: '1 year'
            } );

            // Body weight needs to be treated as a different fundamental unit type compared to mass for stoichiometry
            // Gram-weight, which uses short SI prefixes (e.g. 1 kgwt = 1000 gwt)
            math.createUnit( 'gwt', {
                prefixes: 'short'
            } );

            // Pound-weight, which uses no prefixes
            math.createUnit( 'lbwt', {
                definition: '453.59237 gwt'
            } );

            math.createUnit( 'puff' );

            math.createUnit( 'unit', {
                aliases: [ 'units' ]
            } );

            math.createUnit( 'vial', {
                aliases: [ 'vials' ]
            } );

        },
        getCookieKey: function( varName ) {
            return 'calculators-var-' + varName;
        },
        getVariable: function( varName ) {
            if( mw.calculators.variables.hasOwnProperty( varName ) ) {
                return mw.calculators.variables[ varName ];
            } else {
                return null;
            }
        },
        getValue: function( varName ) {
            if( mw.calculators.variables.hasOwnProperty( varName ) ) {
                return mw.calculators.variables[ varName ].getValue();
            } else {
                return null;
            }
        },
        init: function() {
            mw.calculators.defineUnits();
        },
        setValue: function( varName, value ) {
            if( !mw.calculators.variables.hasOwnProperty( varName ) ) {
                return false;
            }

            return mw.calculators.variables[ varName ].setValue( value );
        }
    };

    mw.calculators.init();

}() );