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generate.nu
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generate.nu
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;; @file generate.nu
;; @discussion Code generator for Objective-C classes.
;; Generates instance variables, accessors, setters, and archiving functions.
;;
;; @copyright Copyright (c) 2007 Tim Burks, Radtastical Inc.
;;
;; Licensed under the Apache License, Version 2.0 (the "License");
;; you may not use this file except in compliance with the License.
;; You may obtain a copy of the License at
;;
;; https://www.apache.org/licenses/LICENSE-2.0
;;
;; Unless required by applicable law or agreed to in writing, software
;; distributed under the License is distributed on an "AS IS" BASIS,
;; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
;; See the License for the specific language governing permissions and
;; limitations under the License.
(load "template")
(class NSString
;; Get the last character of a string.
(- (int) lastCharacter is
(self characterAtIndex:(- (self length) 1)))
;; Capitalize the first character of a string.
(- (id) capitalizeFirstCharacter is
(self stringByReplacingCharactersInRange:'(0 1)
withString:((self substringWithRange:'(0 1)) capitalizedString)))
;; Remove the parentheses surrounding a string.
(- (id) stripParens is
(self substringWithRange:(list 1 (- (self length) 2)))))
;; @abstract A code generator for Objective-C classes.
;; @discussion Given a list of instance variables and their types,
;; NuGenerator generates code for Objective-C classes. This
;; code includes variable declarations, accessors, and
;; encoding and decoding methods. Much of this capability
;; is available in Objective-C 2.0 using properties,
;; but it is provided here to show how easy it is to
;; use Nu to take direct control of the process.
;;
(class NuGenerator is NSObject
(ivars)
;; Initialize a generator with a list that describes a set of classes to be generated.
(- (id) initWithDescription:(id) description is
(super init)
(set @description description)
self)
;; Generate typedefs for enumerated types
(- (id) generateEnumTypedefs is
(set result ((NSMutableString alloc) init))
(@description each:
(do (declaration)
(if (eq (car declaration) 'enum)
(set enumType ((declaration second) stringValue))
(result appendString:<<-END
typedef enum {
END)
(((declaration cdr) cdr) each:
(do (enum)
(result appendString:<<-END
#{enumType}#{enum},
END)))
(result appendString:<<-END
} #{enumType}Type;
END)
)))
result)
;; Generate class forward declarations; usually these are placed in header files.
(- (id) generateDeclarations is
(set result ((NSMutableString alloc) init))
(@description each:
(do (declaration)
(if (eq (car declaration) 'class)
;; open the class interface
(result appendString:<<-END
@class #{(declaration second)};
END))))
result)
;; Generate class interface descriptions; usually these are placed in header files.
(- (id) generateInterfaces is
(set result ((NSMutableString alloc) init))
(@description each:
(do (declaration)
(if (eq (car declaration) 'class)
;; open the class interface
(result appendString:<<-END
@interface #{(declaration second)} : #{(declaration fourth)} {
END)
(set cursor (cdr (cdr (cdr (cdr declaration)))))
(while cursor
(set group (cursor car))
(if (eq (group car) 'ivar)
((group cdr) eachPair:
(do (type name)
;; declare each variable
(result appendString:<<-END
#{((type stringValue) stripParens)} #{name};
END)
)))
(set cursor (cursor cdr)))
;; close the instance variables section
(result appendString:<<-END
}
END)
(set remainder (cdr (cdr (cdr (cdr declaration)))))
(remainder each:
(do (group)
(if (eq (group car) 'ivar)
((group cdr) eachPair:
(do (type name)
;; declare each getter and setter
(result appendString:<<-END
- #{type} #{name};
- (void) set#{((name stringValue) capitalizeFirstCharacter)}: #{type} #{name};
END)
)))))
;; close the class interface
(result appendString:<<-END
@end
END)
)))
result)
;; Generate class implementations; usually these are placed in source (.m) files.
(- (id) generateImplementations is
(set result ((NSMutableString alloc) init))
(@description each:
(do (declaration)
(if (eq (car declaration) 'class)
;; open the class implementation
(result appendString:<<-END
@implementation #{(declaration second)}
END)
(set remainder (cdr (cdr (cdr (cdr declaration)))))
(remainder each:
(do (group)
(if (eq (group car) 'ivar)
((group cdr) eachPair:
(do (type name)
;; define each getter and setter
(result appendString:<<-END
- #{type} #{name} {return #{name};}
- (void) set#{((name stringValue) capitalizeFirstCharacter)}:#{type} _#{name} {
END)
(if (or (eq type '(id)) (eq (((type stringValue) stripParens) lastCharacter) 42))
(result appendString:<<-END
[_#{name} retain];
[#{name} release];
END))
(result appendString:<<-END
#{name} = _#{name};
}
END))))))
;; define the archiving method
(result appendString:<<-END
- (void)encodeWithCoder:(NSCoder *)coder
{
END)
(set remainder (cdr (cdr (cdr (cdr declaration)))))
(remainder each:
(do (group)
(if (eq (group car) 'ivar)
((group cdr) eachPair:
(do (type name)
(result appendString: (self encodeVariable:name withType:type))
(result appendString: (NSString carriageReturn))
)))))
(result appendString:<<-END
}
END)
;; define the unarchiving method
(result appendString:<<-END
- (id) initWithCoder:(NSCoder *)coder
{
[super init];
END)
(set remainder (cdr (cdr (cdr (cdr declaration)))))
(remainder each:
(do (group)
(if (eq (group car) 'ivar)
((group cdr) eachPair:
(do (type name)
(result appendString: (self decodeVariable:name withType:type))
(result appendString: (NSString carriageReturn))
)))))
(result appendString:<<-END
return self;
}
END)
;; close the class implementation
(result appendString:<<-END
@end
END))))
result)
;; Generate code to encode instance variables during archiving.
(+ (id) encodeVariable:(id) name withType:(id) type is
(set typeName ((type stringValue) stripParens))
(cond ((eq typeName "int")
" [coder encodeValueOfObjCType:@encode(int) at:&#{name}];")
((eq typeName "double")
" [coder encodeValueOfObjCType:@encode(double) at:&#{name}];")
((eq typeName "bool")
" [coder encodeValueOfObjCType:@encode(bool) at:&#{name}];")
((eq (typeName lastCharacter) 42)
" [coder encodeObject:#{name}];")
(t
" [coder encodeValueOfObjCType:@encode(int) at:&#{name}];")))
;; Generate code to decode instance variables during unarchiving.
(+ (id) decodeVariable:(id) name withType:(id) type is
(set typeName ((type stringValue) stripParens))
(cond ((eq typeName "int")
" [coder decodeValueOfObjCType:@encode(int) at:&#{name}];")
((eq typeName "double")
" [coder decodeValueOfObjCType:@encode(double) at:&#{name}];")
((eq typeName "bool")
" [coder decodeValueOfObjCType:@encode(bool) at:&#{name}];")
((eq (typeName lastCharacter) 42)
" #{name} = [[coder decodeObject] retain];")
(t
" [coder decodeValueOfObjCType:@encode(int) at:&#{name}];"))))