306 lines
8.4 KiB
JavaScript
306 lines
8.4 KiB
JavaScript
/**
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* Validation rules for members
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*
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* Copyright (C) 2010 Mike Gerwitz
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*
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* This file is part of ease.js.
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*
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* ease.js is free software: you can redistribute it and/or modify it under the
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* terms of the GNU Lesser General Public License as published by the Free
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* Software Foundation, either version 3 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
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* for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* @author Mike Gerwitz
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* @package core
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*/
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module.exports = exports = function MemberBuilderValidator()
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{
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// permit omitting 'new' keyword
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if ( !( this instanceof module.exports ) )
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{
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return new module.exports();
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}
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};
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/**
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* Validates a method declaration, ensuring that keywords are valid, overrides
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* make sense, etc.
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*
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* Throws exception on validation failure
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*
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* @param {string} name method name
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* @param {*} value method value
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*
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* @param {Object.<string,boolean>} keywords parsed keywords
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*
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* @param {Object} prev_data data of member being overridden
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* @param {Object} prev_keywords keywords of member being overridden
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*
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* @return {undefined}
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*/
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exports.prototype.validateMethod = function(
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name, value, keywords, prev_data, prev_keywords
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)
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{
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var prev = ( prev_data ) ? prev_data.member : null;
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if ( keywords[ 'abstract' ] )
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{
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// do not permit private abstract methods (doesn't make sense, since
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// they cannot be inherited/overridden)
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if ( keywords[ 'private' ] )
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{
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throw TypeError(
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"Method '" + name + "' cannot be both private and abstract"
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);
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}
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}
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// const doesn't make sense for methods; they're always immutable
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if ( keywords[ 'const' ] )
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{
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throw TypeError(
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"Cannot declare method '" + name + "' as constant; keyword is " +
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"redundant"
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);
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}
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// virtual static does not make sense, as static methods cannot be
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// overridden
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if ( keywords[ 'virtual' ] && ( keywords[ 'static' ] ) )
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{
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throw TypeError(
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"Cannot declare static method '" + name + "' as virtual"
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);
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}
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// do not allow overriding getters/setters
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if ( prev_data && ( prev_data.get || prev_data.set ) )
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{
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throw TypeError(
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"Cannot override getter/setter '" + name + "' with method"
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);
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}
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// search for any previous instances of this member
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if ( prev )
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{
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// disallow overriding properties with methods
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if ( !( typeof prev === 'function' ) )
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{
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throw TypeError(
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"Cannot override property '" + name + "' with method"
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);
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}
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// disallow overriding non-virtual methods
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if ( keywords[ 'override' ] && !( prev_keywords[ 'virtual' ] ) )
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{
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throw TypeError(
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"Cannot override non-virtual method '" + name + "'"
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);
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}
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// do not allow overriding concrete methods with abstract
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if ( keywords[ 'abstract' ] && !( prev_keywords[ 'abstract' ] ) )
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{
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throw TypeError(
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"Cannot override concrete method '" + name + "' with " +
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"abstract method"
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);
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}
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// ensure parameter list is at least the length of its supertype
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if ( ( value.__length || value.length )
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< ( prev.__length || prev.length )
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)
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{
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throw TypeError(
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"Declaration of method '" + name + "' must be compatible " +
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"with that of its supertype"
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);
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}
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// do not permit visibility deescalation
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if ( this._getVisibilityValue( prev_keywords ) <
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this._getVisibilityValue( keywords )
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)
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{
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throw TypeError(
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"Cannot de-escalate visibility of method '" + name + "'"
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);
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}
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// Disallow overriding method without override keyword (unless parent
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// method is abstract). In the future, this will provide a warning to
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// default to method hiding.
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if ( !( keywords[ 'override' ] || prev_keywords[ 'abstract' ] ) )
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{
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throw TypeError(
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"Attempting to override method '" + name +
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"' without 'override' keyword"
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);
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}
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}
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};
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/**
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* Validates a property declaration, ensuring that keywords are valid, overrides
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* make sense, etc.
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*
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* Throws exception on validation failure
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*
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* @param {string} name method name
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* @param {*} value method value
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*
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* @param {Object.<string,boolean>} keywords parsed keywords
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*
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* @param {Object} prev_data data of member being overridden
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* @param {Object} prev_keywords keywords of member being overridden
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*
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* @return {undefined}
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*/
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exports.prototype.validateProperty = function(
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name, value, keywords, prev_data, prev_keywords
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)
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{
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var prev = ( prev_data ) ? prev_data.member : null;
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// disallow overriding methods with properties
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if ( typeof prev === 'function' )
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{
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throw new TypeError(
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"Cannot override method '" + name + "' with property"
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);
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}
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// do not allow overriding getters/setters
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if ( prev_data && ( prev_data.get || prev_data.set ) )
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{
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throw TypeError(
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"Cannot override getter/setter '" + name + "' with property"
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);
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}
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// do not permit visibility de-escalation
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if ( prev &&
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( this._getVisibilityValue( prev_keywords )
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< this._getVisibilityValue( keywords )
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)
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)
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{
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throw TypeError(
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"Cannot de-escalate visibility of property '" + name + "'"
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);
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}
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// abstract properties do not make sense
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if ( keywords[ 'abstract' ] )
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{
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throw TypeError(
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"Property '" + name + "' cannot be declared as abstract"
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);
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}
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// constants are static
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if ( keywords[ 'static' ] && keywords[ 'const' ] )
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{
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throw TypeError(
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"Static keyword cannot be used with const for property '" +
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name + "'"
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);
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}
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// properties are inherently virtual
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if ( keywords['virtual'] )
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{
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throw TypeError( "Cannot declare property '" + name + "' as virtual" );
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}
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};
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/**
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* Performs common validations on getters/setters
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*
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* If a problem is found, an exception will be thrown.
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*
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* @param {string} name getter/setter name
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* @param {Object.<string,boolean>} keywords parsed keywords
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*
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* @return {undefined}
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*/
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exports.prototype.validateGetterSetter = function(
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name, keywords, prev_data, prev_keywords
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)
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{
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var prev = ( prev_data ) ? prev_data.member : null,
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prev_gs = ( ( prev_data && (prev_data.get || prev_data.set ) )
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? true
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: false
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)
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;
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if ( prev || prev_gs )
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{
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// To speed up the system we'll simply check for a getter/setter, rather
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// than checking separately for methods/properties. This is at the
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// expense of more detailed error messages. They'll live.
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if ( !( prev_gs ) )
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{
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throw TypeError(
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"Cannot override method or property '" + name +
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"' with getter/setter"
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);
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}
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// do not permit visibility de-escalation
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if ( this._getVisibilityValue( prev_keywords )
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< this._getVisibilityValue( keywords )
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)
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{
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throw TypeError(
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"Cannot de-escalate visibility of getter/setter '" + name + "'"
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);
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}
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}
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}
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/**
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* Return the visibility level as a numeric value, where 0 is public and 2 is
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* private
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*
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* @param {Object} keywords keywords to scan for visibility level
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*
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* @return {number} visibility level as a numeric value
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*/
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exports.prototype._getVisibilityValue = function( keywords )
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{
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if ( keywords[ 'protected' ] )
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{
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return 1;
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}
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else if ( keywords[ 'private' ] )
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{
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return 2;
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}
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else
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{
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// default is public
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return 0;
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}
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}
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