34. La notación polaca de Odoo

 Odoo trabaja con notación polaca prefija por ejemplo

["|", ("active", "=", False), ("active", "=", True)]

Pero tanto en Python com en SQL se utiliza la notación infija

if (a>3 or b<=4)

where (age>30 and isAvalible=True)

Vamos a realizar una opción para convertir la notación infija a prefija

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import copy import numbers # ------Imprescindible para poder importar de otras carpetas (de basicutils) import sys from pathlib import Path for i in range(2):sys.path.append(str(Path(__file__).parents[i])) try: # if in the same folder then needs a try and import directly from basicutils import xmutils except Exception as error: import xmutils # ------Fin imprescindible spaces=' ' def toPolish(cond:str, pos=0, indent=0): #print (indent* spaces+ 'call toPolish('+cond+', pos='+str(pos),'strNet='+cond[pos:]+')') myDict={"var1":'', "var2":'', "oper":''} word='' afterSpace=False i=pos while i<len(cond): if (len(word)==0 or afterSpace) and cond[i].lower() in ['a','o','n']: i, anOper=getOperator(cond,i, indent+1) if len(anOper)>0: if len(word)>0: if len(myDict['var1'])==0:myDict['var1']=word elif len(myDict['var2'])==0:myDict['var2']=word if len(myDict['oper'])==0:myDict['oper']=anOper elif anOper in ['and','or']: myDict1=copy.deepcopy(myDict) myDict['var1']=myDict1 myDict['var2']='' myDict['oper']=anOper elif anOper in ['not']: #print(indent*spaces+'toPolish in not word:'+word) if len(myDict['var2'])==0: myDict1={"oper":anOper} i,myDict1["var1"]=getExpressionAfterNot(cond,i, indent+1) if len(myDict['var1'])==0:myDict['var1']=myDict1 elif len(myDict['var2'])==0:myDict['var2']=myDict1 else: raise Exception("Error en toPolish: ya hay dos operandos aqui") word='' if i<len(cond): if (cond[i].lower()>='a' and cond[i].lower()<='z') or \ '0'<=cond[i]<='9' or \ cond[i] in ["_","-","=","!",">","<"]: word+=cond[i] afterSpace=False i+=1 elif cond[i]=="'": i,word=getWordInQuotes(cond,i+1, word, indent+1) afterSpace=False elif cond[i]==' ': afterSpace=True word=word+cond[i] while i<len(cond) and cond[i]==' ': i+=1 #if cond[i] in[' ',"-","=",">","<","'"]: # continue #else : word+=cond[i-1] #if cond[i] in[' ']: continue #elif cond[i] in["-","=",">","<","'"]: # word+=cond[i-1] elif cond[i]=='(': if len(word.strip())>0: #print(indent*spaces+' toPolish word0:'+word) if len(myDict['var1'])==0:myDict['var1']=word elif len(myDict['var2'])==0:myDict['var2']=word else: raise Exception("Error en toPolish: ya hay dos operandos") word='' i,word=getParentesis(cond,i,indent+1) #print(indent*spaces+' toPolish wordA:'+str(word)) if isinstance(word, str) and len(word)>0: afterSpace=True elif isinstance(word, dict): if len(str(myDict['var1']).strip())==0:myDict['var1']=word elif len(str(myDict['var2']).strip())==0:myDict['var2']=word else: raise Exception("Error en toPolish: ya hay dos operandos") word='' else: i+=1 if len(word.strip())>0: #print(indent*spaces+' toPolish:word1:'+str(word)) if len(str(myDict['var1']).strip())==0:myDict['var1']=word elif len(str(myDict['var2']).strip())==0:myDict['var2']=word else: raise Exception("Error en toPolish: ya hay dos operandos") if len(myDict['oper'])==0: #print (indent*spaces+'toPolish: return var1:'+str(myDict['var1'])) return myDict['var1'] else: #print (indent*spaces+'toPolish: return dict:'+str(myDict)) return myDict def getOperator(cond,i, indent): #print(indent*' '+'getOperator('+cond+','+str(i)+',strNet='+cond[i:]+')') j=i;oper='' if cond[i:i+4].lower() in ['and ','and(']: j=i+3;oper='and' elif cond[i:i+3].lower() in ['or ','or(']: j= i+2;oper='or' elif cond[i:i+4].lower() in ['not ','not(']: j=i+3;oper='not' else: j=i;oper='' #print (indent*spaces+'getOperator return j:'+str(j)+',oper:'+str(oper)+',strNet='+cond[i:]+')') return j,oper def getWordInQuotes(cond: str, i:int,word, indent): #print(indent*spaces+'getWordInQuotes(cond:'+cond+',i:'+str(i)+',word:'+str(word)+')') j=cond.find("'",i)+1 word+="'"+cond[i:j+1] #print(indent*spaces+'getWordInQuotes return j:'+str(j)+',word:'+str(word)+',strNet='+cond[i:]+')') return j,word def getParentesis(cond:str,pos:int, indent): #print(indent*spaces+'getParentesis( cond:'+cond+',pos:'+str(pos)+',strNet='+cond[pos:]+')') i=pos+1 nParentesis=1 while nParentesis>0 and i<len(cond): i+=1 if cond[i]=='(': nParentesis+=1 elif cond[i]==')': nParentesis-=1 myVar= toPolish(cond[pos+1:i],indent=indent+1) #print(indent*spaces+'getParentesis return i:'+str(i+1)+',myVar:'+str(myVar)+',strNet='+cond[i+1:]+')') return i+1, myVar def getExpressionAfterNot(cond:str, pos:int, indent): #print(indent*spaces+'getExpressionAfterNot(cond:'+cond+', pos:'+str(pos)+'strNet:'+cond[pos:]+')') i=pos word='' while i<len(cond): if cond[i]==' ': i+=1 continue elif cond[i]=='(': #edu1 #j,word=getParentesis(cond,i) #return i,word return getParentesis(cond,i, indent+1) elif cond[i].lower() in ['a','o','n']: j, anOper=getOperator(cond,i,indent+1) if len(anOper)>0: return i, word else: word+=cond[i] i+=1 else: word+=cond[i] i+=1 #print(indent*spaces+'getExpressionAfterNot return i:'+str(i)+',word:'+str(word)) return i, word def evalExpressionDict(myDict:object, dList:list=[], indent:int=0, conditionAsTuple:bool=True): if isinstance(myDict,dict): oper=myDict.get('oper') var1=myDict.get('var1') var2=myDict.get('var2') if oper is not None and len(oper)>0: dList.append(oper.replace('and','&').replace('or','|').replace('not','!')) if var1 is not None and len(var1)>0: dList=evalExpression(var1,dList, indent+1,conditionAsTuple) if var2 is not None and len(var2)>0: dList=evalExpression(var2,dList, indent+1,conditionAsTuple) else: dList.append(evalStringExpression(myDict, indent+1,conditionAsTuple)) #print(indent*spaces+'evalExpressionDict return dList:'+str(dList)) return dList def evalExpression(expr:object, dList:list, indent:int=0,conditionAsTuple=True): if isinstance(expr,dict): dList=evalExpressionDict(expr,dList, indent+1,conditionAsTuple) else: dList.append(evalStringExpression(expr, indent+1,conditionAsTuple)) #print(indent*spaces+'evalExpression return dList:'+str(dList)) return dList def evalStringExpression(expr:str, indent:int=0, conditionAsTuple=True): i=0 word='' var1='' var2='' oper='' afterSpace=False #if expr=='cc>0': # print ('voila') while i<len(expr): if expr[i] in ['!','=','>','<',' ']: afterSpace=True if expr[i]==' ': i+=1 continue if (len(word)==0 or afterSpace) and expr[i].lower() in ['!','=','>','<','l','i','not','c']: i, aTermOper=getTermOperator(expr,i, indent+1) if len(aTermOper)>0: oper=aTermOper if len(word)>0: if len(var1)==0:var1=word #else: raise Exception("Error en evalStringExpression: ya se ha dado valor a var1 previamente") word='' if len(var2)==0: var2=expr[i:].strip() #remove single quotes if var2[0]=="'": var2=var2[1:-1] else: if var2=='True':var2=True elif var2=='False':var2=False else: #aNumber=xmutils.isNumber(var2) aNumber=None if var2.replace('.','',1).isdigit(): aNumber=float(var2) if '.' in var2 else int(var2) if aNumber is not None: var2=aNumber if isinstance(var2,str) and var2[-1]=="'":var2=var2[:-1] i=len(expr) if len(var1)==0: word+=expr[i] i+=1 #print ('i='+str(i)) #print ('word='+str(word)) #print ('expr='+str(expr)) if conditionAsTuple: aTuple=(var1, oper, var2) else: aTuple=[var1,oper,var2] #print(indent*spaces+'evalStringExpression return aTuple:'+str(aTuple)) return aTuple def getTermOperator(cond:str ,pos:int, indent:int=0): #print(indent*' '+'getTermOperator('+cond+','+str(pos)+',strNet='+cond[pos:]+')') j=pos;oper='';ok=False myDict={ 1:['>','<','='], 2:['or','is','!=','<=','>=','=?','in'], 3:['not','and'], 4:['like'], 5:['ilike','=like'], 6:['is not','=ilike','not in'], 7:['----NO NE HI HA CAP----'], 8:['not like','child of'], 9:['not ilike'] } i=9 while i>0 and not ok: if cond[pos:pos+i].lower() in myDict[i]:ok=True else: i-=1 if ok: j=pos+i; oper=cond[pos:pos+i].lower() #print (indent*spaces+'getTermOperator return j:'+str(j)+',oper:'+str(oper)+',strNet='+cond[i:]+')') return j,oper def getDomainExpression(cond:str, conditionAsTuple:bool=True): myDict=toPolish(cond) print('') print(myDict) print('') aList=evalExpressionDict(myDict, dList=[], indent=0, conditionAsTuple=conditionAsTuple) return aList if __name__ == "__main__": mlist=[ "id = 7259 and (active = True or active = False)", "a ilike '%pepe%'", "not javi>3", "(a>'julio')", "a>'pepe' and not b<'Marta'", "(a>'pepe' and not b<'Marta')", "aa>0 AND (pepe<'edu')", "aa>0 AND (pepe<'edu' or maria>'juan') And (jaime<5 or not(javi>=12))", "aa>'123' and bb<'ddd' and cc>0 or (ee=23 and ff=100)", "aa>'123' and not(b<'Marta' or c>12)", "(pepe<'edu' or maria>'juan') And (jaime<5 or not(javi>=12))", "aa>0 AND (pepe<'edu' or maria>'juan') And (jaime<5 or not(javi>=12))", "not(aa>0 AND (pepe<'edu' or maria>'juan') And (jaime<5 or not(javi>=12)))" ] for st in mlist: print (st) print (getDomainExpression(st, conditionAsTuple=False)) print("--------------------------------------") #print(st) #myDict=toPolish(st) #print (myDict) #print ('---Domain---') #print (evalExpressionDict(myDict)) #print('----') #print('')

Al final en el "__main__" se muestran ejemplos para ver copmo convierte  de notación infija a prefija.