/
ast.py
288 lines (199 loc) · 7.28 KB
/
ast.py
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from enum import Enum
from inspect import getmembers, isclass
from sys import modules
class Expr:
output_size = 1
# Setting this value to true serves as an indication that the result
# of evaluation of this expression is being used in other expressions
# and it's recommended to persist or cache it in some way.
# The actual caching mechanism (if any) is left up to a specific
# interpreter implementation to provide.
to_reuse = False
class IdExpr(Expr):
def __init__(self, expr, to_reuse=False):
self.expr = expr
self.to_reuse = to_reuse
self.output_size = expr.output_size
def __str__(self):
args = ",".join([str(self.expr), "to_reuse=" + str(self.to_reuse)])
return "IdExpr(" + args + ")"
class FeatureRef(Expr):
def __init__(self, index):
self.index = index
def __str__(self):
return "FeatureRef(" + str(self.index) + ")"
class BinExpr(Expr):
pass
# Numeric Expressions.
class NumExpr(Expr):
pass
class NumVal(NumExpr):
def __init__(self, value, dtype=None):
if dtype:
value = dtype(value)
self.value = value
def __str__(self):
return "NumVal(" + str(self.value) + ")"
class AbsExpr(NumExpr):
def __init__(self, expr, to_reuse=False):
assert expr.output_size == 1, "Only scalars are supported"
self.expr = expr
self.to_reuse = to_reuse
def __str__(self):
args = ",".join([str(self.expr), "to_reuse=" + str(self.to_reuse)])
return "AbsExpr(" + args + ")"
class ExpExpr(NumExpr):
def __init__(self, expr, to_reuse=False):
assert expr.output_size == 1, "Only scalars are supported"
self.expr = expr
self.to_reuse = to_reuse
def __str__(self):
args = ",".join([str(self.expr), "to_reuse=" + str(self.to_reuse)])
return "ExpExpr(" + args + ")"
class SqrtExpr(NumExpr):
def __init__(self, expr, to_reuse=False):
assert expr.output_size == 1, "Only scalars are supported"
self.expr = expr
self.to_reuse = to_reuse
def __str__(self):
args = ",".join([str(self.expr), "to_reuse=" + str(self.to_reuse)])
return "SqrtExpr(" + args + ")"
class TanhExpr(NumExpr):
def __init__(self, expr, to_reuse=False):
assert expr.output_size == 1, "Only scalars are supported"
self.expr = expr
self.to_reuse = to_reuse
def __str__(self):
args = ",".join([str(self.expr), "to_reuse=" + str(self.to_reuse)])
return "TanhExpr(" + args + ")"
class PowExpr(NumExpr):
def __init__(self, base_expr, exp_expr, to_reuse=False):
assert base_expr.output_size == 1, "Only scalars are supported"
assert exp_expr.output_size == 1, "Only scalars are supported"
self.base_expr = base_expr
self.exp_expr = exp_expr
self.to_reuse = to_reuse
def __str__(self):
args = ",".join([
str(self.base_expr),
str(self.exp_expr),
"to_reuse=" + str(self.to_reuse)
])
return "PowExpr(" + args + ")"
class BinNumOpType(Enum):
ADD = '+'
SUB = '-'
MUL = '*'
DIV = '/'
class BinNumExpr(NumExpr, BinExpr):
def __init__(self, left, right, op, to_reuse=False):
assert left.output_size == 1, "Only scalars are supported"
assert right.output_size == 1, "Only scalars are supported"
self.left = left
self.right = right
self.op = op
self.to_reuse = to_reuse
def __str__(self):
args = ",".join([
str(self.left),
str(self.right),
self.op.name,
"to_reuse=" + str(self.to_reuse)
])
return "BinNumExpr(" + args + ")"
# Vector Expressions.
class VectorExpr(Expr):
pass
class VectorVal(VectorExpr):
def __init__(self, exprs):
assert all(e.output_size == 1 for e in exprs), (
"All expressions for VectorVal must be scalar")
self.exprs = exprs
self.output_size = len(exprs)
def __str__(self):
args = ",".join([str(e) for e in self.exprs])
return "VectorVal([" + args + "])"
class BinVectorExpr(VectorExpr, BinExpr):
def __init__(self, left, right, op):
assert left.output_size > 1, "Only vectors are supported"
assert left.output_size == right.output_size, (
"Vectors must be of the same size")
self.left = left
self.right = right
self.op = op
self.output_size = left.output_size
def __str__(self):
args = ",".join([str(self.left), str(self.right), self.op.name])
return "BinVectorExpr(" + args + ")"
class BinVectorNumExpr(VectorExpr, BinExpr):
def __init__(self, left, right, op):
assert left.output_size > 1, "Only vectors are supported"
assert right.output_size == 1, "Only scalars are supported"
self.left = left
self.right = right
self.op = op
self.output_size = left.output_size
def __str__(self):
args = ",".join([str(self.left), str(self.right), self.op.name])
return "BinVectorNumExpr(" + args + ")"
# Boolean Expressions.
class BoolExpr(Expr):
pass
class CompOpType(Enum):
GT = '>'
GTE = '>='
LT = '<'
LTE = '<='
EQ = '=='
NOT_EQ = '!='
@staticmethod
def from_str_op(op):
return COMP_OP_TYPE_MAPPING[op]
COMP_OP_TYPE_MAPPING = {e.value: e for e in CompOpType}
class CompExpr(BoolExpr):
def __init__(self, left, right, op):
assert left.output_size == 1, "Only scalars are supported"
assert right.output_size == 1, "Only scalars are supported"
self.left = left
self.right = right
self.op = op
def __str__(self):
args = ",".join([str(self.left), str(self.right), self.op.name])
return "CompExpr(" + args + ")"
# Control Expressions.
class CtrlExpr(Expr):
size = None
class IfExpr(CtrlExpr):
def __init__(self, test, body, orelse):
assert body.output_size == orelse.output_size, (
"body and orelse expressions should have the same output size")
self.test = test
self.body = body
self.orelse = orelse
self.output_size = body.output_size
def __str__(self):
args = ",".join([str(self.test), str(self.body), str(self.orelse)])
return "IfExpr(" + args + ")"
TOTAL_NUMBER_OF_EXPRESSIONS = len(getmembers(modules[__name__], isclass))
NESTED_EXPRS_MAPPINGS = [
((BinExpr, CompExpr), lambda e: [e.left, e.right]),
(PowExpr, lambda e: [e.base_expr, e.exp_expr]),
(VectorVal, lambda e: e.exprs),
(IfExpr, lambda e: [e.test, e.body, e.orelse]),
((AbsExpr, IdExpr, ExpExpr, SqrtExpr, TanhExpr), lambda e: [e.expr]),
]
def count_exprs(expr, exclude_list=None):
expr_type = type(expr)
excluded = tuple(exclude_list) if exclude_list else ()
init = 1
if issubclass(expr_type, excluded):
init = 0
if isinstance(expr, (NumVal, FeatureRef)):
return init
for tpes, nested_f in NESTED_EXPRS_MAPPINGS:
if issubclass(expr_type, tpes):
return init + sum(map(
lambda e: count_exprs(e, exclude_list),
nested_f(expr)))
expr_type_name = expr_type.__name__
raise ValueError("Unexpected expression type '{}'".format(expr_type_name))