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Implement the . attribute access DSL

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This fixes #399
This commit is contained in:
Nicolas Dandrimont 2014-01-09 02:41:49 +01:00
parent d4357fe35c
commit d18e752d33
1 changed files with 41 additions and 0 deletions
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41
hy/compiler.py
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@ -1081,6 +1081,47 @@ class HyASTCompiler(object):
return ret + val
@builds(".")
@checkargs(min=1)
def compile_attribute_access(self, expr):
expr.pop(0) # dot
ret = self.compile(expr.pop(0))
for attr in expr:
if isinstance(attr, HySymbol):
ret += ast.Attribute(lineno=attr.start_line,
col_offset=attr.start_column,
value=ret.force_expr,
attr=ast_str(attr),
ctx=ast.Load())
elif type(attr) == HyList:
if len(attr) != 1:
raise HyTypeError(
attr,
"The attribute access DSL only accepts HySymbols "
"and one-item lists, got {0}-item list instead".format(
len(attr),
),
)
compiled_attr = self.compile(attr.pop(0))
ret = compiled_attr + ret + ast.Subscript(
lineno=attr.start_line,
col_offset=attr.start_column,
value=ret.force_expr,
slice=ast.Index(value=compiled_attr.force_expr),
ctx=ast.Load())
else:
raise HyTypeError(
attr,
"The attribute access DSL only accepts HySymbols "
"and one-item lists, got {0} instead".format(
type(attr).__name__,
),
)
return ret
@builds("del")
@checkargs(min=1)
def compile_del_expression(self, expr):