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compiler/tools: add eval_constant and Fraction support

This commit is contained in:
Sebastien Bourdeauducq 2014-08-13 17:54:22 +08:00
parent a2691ab07a
commit 0145e52d4b
1 changed files with 32 additions and 3 deletions

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@ -1,4 +1,5 @@
import ast import ast
from fractions import Fraction
from artiq.language import core as core_language from artiq.language import core as core_language
from artiq.language import units from artiq.language import units
@ -13,6 +14,10 @@ def eval_ast(expr, symdict=dict()):
def value_to_ast(value): def value_to_ast(value):
if isinstance(value, int): if isinstance(value, int):
return ast.Num(value) return ast.Num(value)
elif isinstance(value, Fraction):
return ast.Call(func=ast.Name("Fraction", ast.Load()),
args=[ast.Num(value.numerator), ast.Num(value.denominator)],
keywords=[], starargs=None, kwargs=None)
elif isinstance(value, str): elif isinstance(value, str):
return ast.Str(value) return ast.Str(value)
else: else:
@ -22,10 +27,34 @@ def value_to_ast(value):
if isinstance(value, units.Quantity): if isinstance(value, units.Quantity):
return ast.Call( return ast.Call(
func=ast.Name("Quantity", ast.Load()), func=ast.Name("Quantity", ast.Load()),
args=[ast.Num(value.amount), ast.Name("base_"+value.unit.name+"_unit", ast.Load())], args=[value_to_ast(value.amount), ast.Name(value.unit.name+"_unit", ast.Load())],
keywords=[], starargs=None, kwargs=None) keywords=[], starargs=None, kwargs=None)
return None return None
class NotConstant(Exception):
pass
def eval_constant(node):
if isinstance(node, ast.Num):
return node.n
elif isinstance(node, ast.Str):
return node.s
elif isinstance(node, ast.Call):
funcname = node.func.id
if funcname == "Fraction":
numerator, denominator = eval_constant(node.args[0]), eval_constant(node.args[1])
return Fraction(numerator, denominator)
elif funcname == "Quantity":
amount, unit = node.args
amount = eval_constant(amount)
try:
unit = getattr(units, unit.id)
except:
raise NotConstant
return units.Quantity(amount, unit)
else:
raise NotConstant
def make_stmt_transformer(transformer_class): def make_stmt_transformer(transformer_class):
def stmt_transformer(stmts, *args, **kwargs): def stmt_transformer(stmts, *args, **kwargs):
transformer = transformer_class(*args, **kwargs) transformer = transformer_class(*args, **kwargs)