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'''
Stepper.step steps through one instruction of a GvR program
at a time, and then it calls back into your world
object to actually do MOVE(), TURNLEFT(), etc.
Read TESTstepper.py to grok this.
'''
import translate,sys
class OutOfInstructionsException(Exception):
def __str__(self): return 'Out of instructions'
class InfiniteLoopException(Exception):
pass
class StackFrame:
def __init__(self, block):
self.whichStatement = -1
self.block = block
def nextLineOfCode(self, world):
self.whichStatement += 1
if self.whichStatement < len(self.block.statements):
return self.block.statements[self.whichStatement]
def currLine(obj):
curr = obj.block.statements[obj.whichStatement]
if getBlockFrame(curr):
return ''
else:
lnum = str(curr.line+1).rjust(3)
stat = str(curr.statement)
return ' '+lnum+' '+stat+'\n'
def atEndOfBlock(obj):
return obj.whichStatement >= len(obj.block.statements)
def atNewBlock(obj):
return obj.whichStatement == 0
def checkCondition(obj, world):
methodInWorldClass = getattr(world, obj.condition.statement)
return methodInWorldClass()
def getBlockFrame(block):
blockFrames = {
'DoLoop': DoLoop,
'WhileLoop': WhileLoop,
'IfStatement': IfStatement
}
return blockFrames.get(block.__class__.__name__,None)
class DoLoop:
def __init__(self, doLoop):
self.whichLoop = 0
self.whichStatement = -1
self.block = doLoop.block
self.iterations = int(doLoop.iterator)
def nextLineOfCode(self, world):
self.whichStatement += 1
if atEndOfBlock(self):
self.whichStatement = 0
self.whichLoop += 1
if self.whichLoop < self.iterations:
return self.block.statements[self.whichStatement]
class WhileLoop:
def __init__(self, whileLoop):
self.whichStatement = -1
self.block = whileLoop.block
self.whileLoop = whileLoop
def nextLineOfCode(self, world):
self.whichStatement += 1
if atEndOfBlock(self):
self.whichStatement = 0
if atNewBlock(self):
if not checkCondition(self.whileLoop, world): return
return self.block.statements[self.whichStatement]
class IfStatement:
def __init__(self, ifStatement):
self.whichStatement = -1
self.ifStatement = ifStatement
self.conditionalBlocks = [ifStatement] + ifStatement.elifs
self.block = None
def nextLineOfCode(self, world):
self.whichStatement += 1
if atNewBlock(self):
for conditionalBlock in self.conditionalBlocks:
if checkCondition(conditionalBlock, world):
self.block = conditionalBlock.block
break
if not self.block:
if self.ifStatement.elseObj:
self.block = self.ifStatement.elseObj
else:
return
if atEndOfBlock(self):
return
return self.block.statements[self.whichStatement]
class Stepper:
def __init__(self, gvr, world, debugger=None):
tree = translate.gvrToSyntaxTree(gvr)
self.world = world
self.stack = [StackFrame(tree.block)]
self.funcs = {}
for func in tree.functions:
self.funcs[func.name] = func
self.debugger = debugger
self.infinite_count = 0
def step(self):
self.infinite_count +=1
if self.infinite_count > 9586:
v = self.infinite_count
self.infinite_count = 0
raise InfiniteLoopException,v
lineOfCode = self.nextLineOfCode()
blockFrame = getBlockFrame(lineOfCode)
if blockFrame:
self.enterBlock(blockFrame(lineOfCode))
return
command = lineOfCode.statement
if self.funcs.has_key(command):
self.enterUserDefinedMethod(command)
return
if self.debugger:
self.debugger.setLine(lineOfCode.line)
if lineOfCode.__class__.__name__ == 'Cheat':
self.world.cheat(lineOfCode.statement)
else:
self.doPrimitive(command)
def doPrimitive(self, command):
methodInWorldClass = getattr(self.world, command.upper())
methodInWorldClass()
def enterBlock(self, stackFrame):
self.stack.append(stackFrame)
self.step()
def enterUserDefinedMethod(self, command):
self.enterBlock(StackFrame(self.funcs[command].block))
def stackTrace(self):
trace = 'Line Statement\n'
for frame in self.stack:
trace += currLine(frame)
return trace
def nextLineOfCode(self):
if len(self.stack):
lineOfCode = self.stack[-1].nextLineOfCode(self.world)
if lineOfCode:
return lineOfCode
else:
self.stack.pop()
return self.nextLineOfCode()
else: raise OutOfInstructionsException
|
