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making sure that the body of extends only gets defined once per file.

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Jeremy Ashkenas
2010-02-27 19:29:34 -05:00
parent 8f871a8218
commit d2cb1f321e
2 changed files with 162 additions and 276 deletions
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35
src/nodes.coffee
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@@ -371,30 +371,25 @@ exports.CallNode: class CallNode extends BaseNode
exports.ExtendsNode: class ExtendsNode extends BaseNode
type: 'Extends'
code: '''
function(child, parent) {
var ctor = function(){ };
ctor.prototype = parent.prototype;
child.__superClass__ = parent.prototype;
child.prototype = new ctor();
child.prototype.constructor = child;
}
'''
constructor: (child, parent) ->
@children: [@child: child, @parent: parent]
# Hooking one constructor into another's prototype chain.
compile_node: (o) ->
construct: o.scope.free_variable()
child: @child.compile(o)
parent: @parent.compile(o)
prefix: ''
if not (@child instanceof ValueNode) or @child.has_properties() or not (@child.unwrap() instanceof LiteralNode)
child_var: o.scope.free_variable()
prefix += @idt() + child_var + ' = ' + child + ';\n'
child: child_var
if not (@parent instanceof ValueNode) or @parent.has_properties() or not (@parent.unwrap() instanceof LiteralNode)
parent_var: o.scope.free_variable()
prefix += @idt() + parent_var + ' = ' + parent + ';\n'
parent: parent_var
prefix + @idt() + construct + ' = function(){};\n' + @idt() +
construct + '.prototype = ' + parent + ".prototype;\n" + @idt() +
child + '.__superClass__ = ' + parent + ".prototype;\n" + @idt() +
child + '.prototype = new ' + construct + "();\n" + @idt() +
child + '.prototype.constructor = ' + child + ';'
statement ExtendsNode
o.scope.assign('__extends', @code, true)
ref: new ValueNode new LiteralNode '__extends'
call: new CallNode ref, [@child, @parent]
call.compile(o)
# A dotted accessor into a part of a value, or the :: shorthand for
@@ -532,7 +527,7 @@ exports.ClassNode: class ClassNode extends BaseNode
construct: @idt() + constructor.compile(o) + ';\n'
props: if props.empty() then '' else props.compile(o) + '\n'
extension: if extension then extension.compile(o) + '\n' else ''
extension: if extension then @idt() + extension.compile(o) + ';\n' else ''
returns: if ret then '\n' + @idt() + 'return ' + @variable.compile(o) + ';' else ''
construct + extension + props + returns