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Add the abitlity to assign during a declaration and type inference if no type given but there is an expression

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Nathan Braswell
2016-01-17 01:10:09 -05:00
parent 9c41c2fd12
commit bffedcf2fd
4 changed files with 35 additions and 9 deletions
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22
stdlib/ast_transformation.krak
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@@ -272,8 +272,20 @@ obj ast_transformation (Object) {
}
fun transform_declaration_statement(node: *tree<symbol>, scope: *ast_node): *ast_node {
var name = concat_symbol_tree(get_node("identifier", node))
var identifier = ast_identifier_ptr(name, transform_type(get_node("type", node), scope, map<string, *type>()))
var declaration = ast_declaration_statement_ptr(identifier)
// may have type, or an expression, or both
var type_syntax_node = get_node("type", node)
var expression_syntax_node = get_node("boolean_expression", node)
var ident_type = null<type>()
var expression = null<ast_node>()
if (type_syntax_node) ident_type = transform_type(type_syntax_node, scope, map<string, *type>())
if (expression_syntax_node) {
expression = transform(expression_syntax_node, scope)
if (!type_syntax_node)
ident_type = get_ast_type(expression)
}
if (!ident_type) error("declaration statement with no type or expression from which to inference type")
var identifier = ast_identifier_ptr(name, ident_type)
var declaration = ast_declaration_statement_ptr(identifier, expression)
add_to_scope(name, identifier, scope)
return declaration
}
@@ -386,4 +398,10 @@ fun add_to_scope(name: string, to_add: *ast_node, add_to: *ast_node) {
else
add_to_map->set(name, vector(to_add))
}
fun error(message: *char) error(string(message));
fun error(message: string) {
println("****ERROR****")
println(message)
while (true){}
}