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translate.py
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translate.py
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import json
import sys
from string import Template
import os.path
import argparse
import re
# import set in a python 2->3 safe way
try:
set
except NameError:
from sets import Set as set
class Translator:
def __init__(self, targetDict):
self.dependencies = {
# All object types used throughout the program
"AllClasses":set(),
# All classes where the class interface has been used explicitly.
# I.e. classes used to construct objects and classes where static
# methods are called
"InterfacedClasses":set(),
# All enum types used throughout the program
"Enums":set()
}
self.targetDict = targetDict
self.storeVars = False
def translateProgram(self, program, programName=None,
tags={}, storeVars=False):
""" Translate program AST
Args:
program: object like [statementAST, statementAST, statementAST, ...]
"""
# reset dependencies
self.dependencies["AllClasses"] = set()
self.dependencies["InterfacedClasses"] = set()
self.dependencies["Enums"] = set()
self.tags = tags
self.storeVars = storeVars
self.varsToStore = []
targetProgram = ""
for line in program:
if "Statement" in line:
targetProgram += self.translateStatement(line["Statement"])
elif "Comment" in line:
targetProgram += self.translateComment(line["Comment"])
programTemplate = Template(self.targetDict["Program"])
testing = ""
if self.storeVars:
testing = self.translateVarsStoring(programName)
return programTemplate.substitute(program=targetProgram,
testing=testing,
dependencies=self.dependenciesString(),
programName=programName)
def translateVarsStoring(self, programName):
result = ""
storage = "__sg_storage"
storageFile = "__sg_storage_file"
# TODO: handle directories
storageFilename = {"Expr": {"StringLiteral": "{}.dat".format(programName)}}
# 'w'
storageFilemode = {"Expr": {"NumberLiteral": "119"}}
storageComment = {"Comment": {"StringLiteral": "Serialize output for integration testing (automatically generated)"}}
storageInit = {"Init": [{"ObjectType": "WrappedObjectArray"},
{"Identifier": storage},
{"ArgumentList": []}]}
storageFileInit = {"Init": [{"ObjectType": "SerializableAsciiFile"},
{"Identifier": storageFile},
{"ArgumentList": [storageFilename, storageFilemode]}]}
result += self.translateStatement(storageInit)
result += self.translateStatement(storageFileInit)
for vartype, varname in self.varsToStore:
# avoid storing itself
if varname in (storage, storageFile):
continue
varnameExpr = {"Expr": {"StringLiteral": varname}}
varnameIdentifierExpr = {"Expr": {"Identifier": varname}}
methodCall = {"MethodCall": [{"Identifier": storage},
{"Identifier": "append_wrapped"},
[varnameIdentifierExpr, varnameExpr]]}
expression = {"Expr": methodCall}
result += self.translateStatement(expression)
storageSerialize = {"Expr": {"MethodCall": [{"Identifier": storage},
{"Identifier": "save_serializable"},
[{"Expr": {"Identifier": storageFile}}]]}}
result += self.translateStatement(storageSerialize)
return result
def dependenciesString(self):
""" Returns dependency import string
e.g. for python: "from modshogun import RealFeatures\n\n"
"""
if not "Dependencies" in self.targetDict:
# Dependency strings are optional so we just return empty string
return ""
# Three types of dependencies: a list of all classes used,
# a list of all explicitly constructed classes,
# and list of all enums used. All are optional.
allClassDependencies = ""
interfacedClassDependencies = ""
enumDependencies = ""
dependenciesExist = False
if len(self.dependencies["AllClasses"]) > 0 and "AllClassDependencies" in self.targetDict["Dependencies"]:
dependenciesExist = True
template = Template(self.targetDict["Dependencies"]["AllClassDependencies"])
allClassDependencies = template.substitute(classlist=self.seperatedClassDependencies("AllClasses"))
if len(self.dependencies["InterfacedClasses"]) > 0 and "InterfacedClassDependencies" in self.targetDict["Dependencies"]:
dependenciesExist = True
template = Template(self.targetDict["Dependencies"]["InterfacedClassDependencies"])
interfacedClassDependencies = template.substitute(classlist=self.seperatedClassDependencies("InterfacedClasses"))
if len(self.dependencies["Enums"]) > 0 and "EnumDependencies" in self.targetDict["Dependencies"]:
dependenciesExist = True
template = Template(self.targetDict["Dependencies"]["EnumDependencies"])
enumDependencies = template.substitute(enums=self.seperatedEnumDependencies())
if not dependenciesExist:
return ""
allDependenciesTemplate = Template(self.targetDict["Dependencies"]["AllDependencies"])
return allDependenciesTemplate.substitute(allClassDependencies=allClassDependencies,
interfacedClassDependencies=interfacedClassDependencies,
enumDependencies=enumDependencies)
def seperatedClassDependencies(self, type):
if len(self.dependencies[type]) == 0:
return ""
dependencyList = list(self.dependencies[type])
# Elements are just formatted as their names as default
elementTemplate = Template("$element")
if "DependencyListElementClass" in self.targetDict["Dependencies"]:
elementTemplate = Template(self.targetDict["Dependencies"]["DependencyListElementClass"])
# Retrieve list separator
seperator = self.targetDict["Dependencies"]["DependencyListSeparator"]
# separated dependencies
csdependencies = ""
for i, x in enumerate(dependencyList):
if '$include' in elementTemplate.template:
csdependencies += elementTemplate.substitute(element=x, include=self.getIncludePathForClass(x))
else:
csdependencies += elementTemplate.substitute(element=x)
if i < len(dependencyList)-1:
csdependencies += seperator
return csdependencies
def getIncludePathForClass(self, type_):
translatedType = self.translateType({"ObjectType": type_})
template_parameter_matcher = '\<[0-9a-zA-Z_]*\>'
variants = [
translatedType,
'C' + translatedType,
re.sub(template_parameter_matcher, '', translatedType),
'C' + re.sub(template_parameter_matcher, '', translatedType)
]
for variant in variants:
if variant in self.tags:
return self.tags[variant]
raise Exception('Failed to obtain include path for %s' % (' or '.join(variants)))
def seperatedEnumDependencies(self):
if len(self.dependencies["Enums"]) == 0:
return ""
dependencyList = list(self.dependencies["Enums"])
# Enums are formatted as their value by default
elementTemplate = Template("$value")
if "DependencyListElementEnum" in self.targetDict["Dependencies"]:
elementTemplate = Template(self.targetDict["Dependencies"]["DependencyListElementEnum"])
# Retrieve list separator
seperator = self.targetDict["Dependencies"]["DependencyListSeparator"]
# separated dependencies
sdependencies = ""
for i, x in enumerate(dependencyList):
sdependencies += elementTemplate.substitute(type=x[0],value=x[1])
if i < len(dependencyList)-1:
sdependencies += seperator
return sdependencies
def translateStatement(self, statement):
""" Translate statement AST
Args:
statement: object like {"Init": initAST}, {"Assign": assignAST},
{"Expr": exprAST}, "\n"
"""
if statement == "\n": # Newline handling
return "\n"
# python2/3 safe dictionary keys
type = list(statement.keys())[0]
translation = None
if type == "Init":
translation = self.translateInit(statement["Init"])
elif type == "Assign":
template = Template(self.targetDict["Assign"])
name = statement["Assign"][0]["Identifier"]
expr = self.translateExpr(statement["Assign"][1]["Expr"])
translation = template.substitute(name=name, expr=expr)
elif type == "Expr":
translation = self.translateExpr(statement["Expr"])
elif type == "Print":
translation = self.translatePrint(statement["Print"])
if translation == None:
raise Exception("Unknown statement type: " + type)
template = Template(self.targetDict["Statement"])
return template.substitute(statement=translation)
def translateInit(self, init):
""" Translate initialisation statement AST
Args:
init: object like [typeAST, identifierAST, exprAST],
[typeAST, identifierAST, argumentListAST], etc.
"""
typeString = self.translateType(init[0])
nameString = init[1]["Identifier"]
# store only real valued matrices, vectors and scalars
if self.storeVars:
append_store = False
if "ObjectType" in init[0]:
if init[0]["ObjectType"] in ("RealVector", "RealMatrix", "FloatVector", "FloatMatrix"):
append_store = True
elif "BasicType" in init[0]:
if init[0]["BasicType"] in ("real", "float", "int"):
append_store = True
if append_store:
self.varsToStore.append((typeString, nameString))
initialisation = init[2]
# python2/3 safe dictionary keys
if list(initialisation.keys())[0] == "Expr":
template = Template(self.targetDict["Init"]["Copy"])
exprString = self.translateExpr(initialisation["Expr"])
return template.substitute(name=nameString, type=typeString, expr=exprString)
elif list(initialisation.keys())[0] == "ArgumentList":
self.dependencies["InterfacedClasses"].add(typeString)
template = Template(self.targetDict["Init"]["Construct"])
argsString = self.translateArgumentList(initialisation["ArgumentList"])
return template.substitute(name=nameString, type=typeString, arguments=argsString)
def translateExpr(self, expr):
""" Translate expression AST
Args:
expr: object like {"MethodCall": [identifierAST, identifierAST, argumentListAST]},
{"BoolLiteral": "False"}, {"StringLiteral": "train.dat"}, {"NumberLiteral": 4},
{"Identifier": "feats_test"}, etc.
"""
# python2/3 safe dictionary keys
key = list(expr.keys())[0]
if key == "MethodCall":
template = Template(self.targetDict["Expr"]["MethodCall"])
object = expr[key][0]["Identifier"]
method = expr[key][1]["Identifier"]
argsList = None
try:
argsList = expr[key][2]
except IndexError:
pass
translatedArgsList = self.translateArgumentList(argsList)
return template.substitute(object=object, method=method, arguments=translatedArgsList)
elif key == "StaticCall":
template = Template(self.targetDict["Expr"]["StaticCall"])
type_ = self.translateType(expr[key][0])
method = expr[key][1]["Identifier"]
argsList = None
try:
argsList = expr[key][2]
except IndexError:
pass
translatedArgsList = self.translateArgumentList(argsList)
self.dependencies["InterfacedClasses"].add(type_)
return template.substitute(type=type_, method=method, arguments=translatedArgsList)
elif key == "BoolLiteral":
return self.targetDict["Expr"]["BoolLiteral"][expr[key]]
elif key == "StringLiteral":
template = Template(self.targetDict["Expr"]["StringLiteral"])
return template.substitute(literal=expr[key])
elif key == "NumberLiteral":
template = Template(self.targetDict["Expr"]["NumberLiteral"])
return template.substitute(number=expr[key])
elif key == "Identifier":
template = Template(self.targetDict["Expr"]["Identifier"])
return template.substitute(identifier=expr[key])
elif key == "Enum":
# Add enum to dependencies in case they need to be imported explicitly
self.dependencies["Enums"].add((expr[key][0]["Identifier"], expr[key][1]["Identifier"]))
template = Template(self.targetDict["Expr"]["Enum"])
return template.substitute(type=expr[key][0]["Identifier"],value=expr[key][1]["Identifier"])
raise Exception("Unknown expression type: " + key)
def translatePrint(self, printStmt):
template = Template(self.targetDict["Print"])
return template.substitute(expr=self.translateExpr(printStmt["Expr"]))
def translateComment(self, commentString):
template = Template(self.targetDict["Comment"])
return template.substitute(comment=commentString)
def translateType(self, type):
""" Translate type AST
Args:
type: object like {"ObjectType": "IntMatrix"}, {"BasicType": "float"}, etc.
"""
template = ""
# python2/3 safe dictionary keys
typeKey = list(type.keys())[0]
# Store dependency
if typeKey == "ObjectType":
self.dependencies["AllClasses"].add(type[typeKey])
if type[typeKey] in self.targetDict["Type"]:
template = Template(self.targetDict["Type"][type[typeKey]])
else:
template = Template(self.targetDict["Type"]["Default"])
return template.substitute(type=type[typeKey])
def translateArgumentList(self, argumentList):
""" Translate argument list AST
Args:
argumentList: object like None, {"Expr": exprAST},
[{"Expr": exprAST}, {"Expr": exprAST}], etc.
"""
if argumentList == None or argumentList == []:
return ""
if isinstance(argumentList, list):
head = argumentList[0]
tail = argumentList[1:]
translation = self.translateArgumentList(head)
if len(tail) > 0:
translation += ", " + self.translateArgumentList(tail)
return translation
else:
if "Expr" in argumentList:
return self.translateExpr(argumentList["Expr"])
elif "ArgumentList" in argumentList:
return self.translateArgumentList(argumentList["ArgumentList"])
def translate(ast, targetDict, tags, storeVars):
translator = Translator(targetDict)
programName = os.path.basename(ast["FilePath"]).split(".")[0]
return translator.translateProgram(ast["Program"], programName, tags, storeVars)
def loadTargetDict(targetJsonPath):
try:
with open(targetJsonPath, "r") as jsonDictFile:
return json.load(jsonDictFile)
except IOError as err:
if err.errno == 2:
print("Target \"" + targetJsonPath + "\" does not exist")
else:
print(err)
raise Exception("Could not load target dictionary")
if __name__ == "__main__":
# Parse command line arguments
parser = argparse.ArgumentParser()
parser.add_argument("-t", "--target", nargs='?', help="Translation target. Possible values: cpp, python, java, r, octave, csharp, ruby, lua. (default: python)")
parser.add_argument("path", nargs='?', help="Path to input file. If not specified input is read from stdin")
args = parser.parse_args()
# Load target dictionary
target = "python"
if args.target:
target = args.target
targetDict = loadTargetDict("targets/" + target + ".json")
# Read from input file (stdin or given path)
programObject = None
if args.path:
with open(args.path, "r") as inputFile:
programObject = json.load(inputFile)
else:
programObject = json.load(sys.stdin)
print(translate(programObject, targetDict, tags={}, storeVars=False))