# Create a Direct Acyclic Rule Graph (DARG)
import re
import traceback
import json
import darg
dACTIONS = {}
dFUNCTIONS = {}
def prepareFunction (s, bTokenValue=False):
s = s.replace("__also__", "bCondMemo")
s = s.replace("__else__", "not bCondMemo")
s = re.sub(r"(select|exclude|define)[(][\\](\d+)", 'g_\\1(lToken[\\2+nTokenOffset]', s)
s = re.sub(r"(morph|displayInfo)[(]\\(\d+)", 'g_\\1(lToken[\\2+nTokenOffset]', s)
s = re.sub(r"token\(\s*(\d)", 'nextToken(\\1', s) # token(n)
s = re.sub(r"token\(\s*-(\d)", 'prevToken(\\1', s) # token(-n)
s = re.sub(r"before\(\s*", 'look(s[:m.start()], ', s) # before(s)
s = re.sub(r"after\(\s*", 'look(s[m.end():], ', s) # after(s)
s = re.sub(r"textarea\(\s*", 'look(s, ', s) # textarea(s)
s = re.sub(r"before_chk1\(\s*", 'look_chk1(dDA, s[:m.start()], 0, ', s) # before_chk1(s)
s = re.sub(r"after_chk1\(\s*", 'look_chk1(dDA, s[m.end():], m.end(), ', s) # after_chk1(s)
s = re.sub(r"textarea_chk1\(\s*", 'look_chk1(dDA, s, 0, ', s) # textarea_chk1(s)
s = re.sub(r"\bspell *[(]", '_oSpellChecker.isValid(', s)
if bTokenValue:
# token values are used as parameter
s = re.sub(r"[\\](\d+)", 'lToken[\\1+nTokenOffset]["sValue"]', s)
else:
# tokens used as parameter
s = re.sub(r"[\\](\d+)", 'lToken[\\1+nTokenOffset]', s)
return s
def genTokenLines (sTokenLine):
"tokenize a string and return a list of lines of tokens"
lToken = sTokenLine.split()
lTokenLines = None
for i, sToken in enumerate(lToken):
if sToken.startswith("{") and sToken.endswith("}") and sToken in dDEF:
lToken[i] = dDEF[sToken]
if ( (sToken.startswith("[") and sToken.endswith("]")) or (sToken.startswith("([") and sToken.endswith("])")) ):
bSelectedGroup = sToken.startswith("(") and sToken.endswith(")")
if bSelectedGroup:
sToken = sToken[1:-1]
# multiple token
if not lTokenLines:
lTokenLines = [ [s] for s in sToken[1:-1].split("|") ]
else:
lNewTemp = []
for aRule in lTokenLines:
lElem = sToken[1:-1].split("|")
sElem1 = lElem.pop(0)
if bSelectedGroup:
sElem1 = "(" + sElem1 + ")"
for sElem in lElem:
if bSelectedGroup:
sElem = "(" + sElem + ")"
aNew = list(aRule)
aNew.append(sElem)
lNewTemp.append(aNew)
aRule.append(sElem1)
lTokenLines.extend(lNewTemp)
else:
# simple token
if not lTokenLines:
lTokenLines = [[sToken]]
else:
for aRule in lTokenLines:
aRule.append(sToken)
for aRule in lTokenLines:
yield aRule
def createRule (iLine, sRuleName, sTokenLine, sActions, nPriority):
# print(iLine, "//", sRuleName, "//", sTokenLine, "//", sActions, "//", nPriority)
for lToken in genTokenLines(sTokenLine):
# Calculate positions
dPos = {} # key: iGroup, value: iToken
iGroup = 0
for i, sToken in enumerate(lToken):
if sToken.startswith("(") and sToken.endswith(")"):
lToken[i] = sToken[1:-1]
iGroup += 1
dPos[iGroup] = i + 1 # we add 1, for we count tokens from 1 to n (not from 0)
# Parse actions
for nAction, sAction in enumerate(sActions.split(" <<- ")):
sAction = sAction.strip()
if sAction:
sActionId = sRuleName + "_a" + str(nAction)
aAction = createAction(sActionId, sAction, nPriority, len(lToken), dPos)
if aAction:
dACTIONS[sActionId] = aAction
lResult = list(lToken)
lResult.extend(["##"+str(iLine), sActionId])
yield lResult
def changeReferenceToken (s, dPos):
for i in range(len(dPos), 0, -1):
s = s.replace("\\"+str(i), "\\"+str(dPos[i]))
return s
def createAction (sIdAction, sAction, nPriority, nToken, dPos):
# Option
sOption = False
m = re.match("/(\\w+)/", sAction)
if m:
sOption = m.group(1)
sAction = sAction[m.end():].strip()
# valid action?
m = re.search("(?P<action>[-~=])(?P<start>\\d+|)(?P<end>:\\d+|)>> ", sAction)
if not m:
print(" # Error. No action found at: ", sIdAction)
print(" ==", sAction, "==")
return None
# Condition
sCondition = sAction[:m.start()].strip()
if sCondition:
sCondition = prepareFunction(sCondition)
sCondition = changeReferenceToken(sCondition, dPos)
dFUNCTIONS["g_c_"+sIdAction] = sCondition
sCondition = "g_c_"+sIdAction
else:
sCondition = ""
# Action
cAction = m.group("action")
sAction = sAction[m.end():].strip()
sAction = changeReferenceToken(sAction, dPos)
if not m.group("start"):
iStartAction = 1
iEndAction = nToken
else:
iStartAction = int(m.group("start"))
iEndAction = int(m.group("end")[1:]) if m.group("end") else iStartAction
if dPos:
try:
iStartAction = dPos[iStartAction]
iEndAction = dPos[iEndAction]
except:
print("# Error. Wrong groups in: " + sIdAction)
if cAction == "-":
## error
iMsg = sAction.find(" # ")
if iMsg == -1:
sMsg = "# Error. Error message not found."
sURL = ""
print(sMsg + " Action id: " + sIdAction)
else:
sMsg = sAction[iMsg+3:].strip()
sAction = sAction[:iMsg].strip()
sURL = ""
mURL = re.search("[|] *(https?://.*)", sMsg)
if mURL:
sURL = mURL.group(1).strip()
sMsg = sMsg[:mURL.start(0)].strip()
if sMsg[0:1] == "=":
sMsg = prepareFunction(sMsg[1:], True)
dFUNCTIONS["g_m_"+sIdAction] = sMsg
for x in re.finditer("lToken\\[(\\d+)\\]", sMsg):
if int(x.group(1)) > nToken:
print("# Error in token index in message at line " + sIdAction + " ("+str(nToken)+" tokens only)")
sMsg = "=g_m_"+sIdAction
else:
for x in re.finditer(r"\\(\d+)", sMsg):
if int(x.group(1)) > nToken:
print("# Error in token index in message at line " + sIdAction + " ("+str(nToken)+" tokens only)")
if re.search("[.]\\w+[(]", sMsg):
print("# Error in message at line " + sIdAction + ": This message looks like code. Line should begin with =")
# checking consistancy
if cAction == "=" or sAction[0:1] == "=":
if "define" in sAction and not re.search(r"define\(\\\d+ *, *\[.*\] *\)", sAction):
print("# Error in action at line " + sIdAction + ": second argument for define must be a list of strings")
for x in re.finditer(r"\\(\d+)", sAction):
if int(x.group(1)) > nToken:
print("# Error in token index in replacement at line " + sIdAction + " ("+str(nToken)+" tokens only)")
if sAction[0:1] != "=":
if re.search("[.]\\w+[(]|sugg\\w+[(]", sAction):
print("# Error in action at line " + sIdAction + ": This action looks like code. Line should begin with =")
if cAction == "-":
## error detected --> suggestion
if not sAction:
print("# Error in action at line " + sIdAction + ": This action is empty.")
if sAction[0:1] == "=":
sAction = prepareFunction(sAction, True)
dFUNCTIONS["g_s_"+sIdAction] = sAction[1:]
sAction = "=g_s_"+sIdAction
elif sAction.startswith('"') and sAction.endswith('"'):
sAction = sAction[1:-1]
if not sMsg:
print("# Error in action at line " + sIdAction + ": The message is empty.")
return [sOption, sCondition, cAction, sAction, iStartAction, iEndAction, nPriority, sMsg, sURL]
elif cAction == "~":
## text processor
if not sAction:
print("# Error in action at line " + sIdAction + ": This action is empty.")
if sAction[0:1] == "=":
dFUNCTIONS["g_p_"+sIdAction] = sAction[1:]
sAction = "=g_p_"+sIdAction
elif sAction.startswith('"') and sAction.endswith('"'):
sAction = sAction[1:-1]
return [sOption, sCondition, cAction, sAction, iStartAction, iEndAction]
elif cAction == "=":
## disambiguator
if sAction[0:1] == "=":
sAction = sAction[1:]
if not sAction:
print("# Error in action at line " + sIdAction + ": This action is empty.")
sAction = prepareFunction(sAction)
dFUNCTIONS["g_d_"+sIdAction] = sAction
sAction = "g_d_"+sIdAction
return [sOption, sCondition, cAction, sAction]
elif cAction == ">":
## no action, break loop if condition is False
return [sOption, sCondition, cAction, ""]
else:
print("# Unknown action at line " + sIdAction)
return None
def make (lRule, sLang, bJavaScript):
"compile rules, returns a dictionary of values"
# for clarity purpose, don’t create any file here
# removing comments, zeroing empty lines, creating definitions, storing tests, merging rule lines
print(" parsing rules...")
lTokenLine = []
sActions = ""
nPriority = 4
dAllGraph = {}
sGraphName = ""
for i, sLine in lRule:
sLine = sLine.rstrip()
if "\t" in sLine:
# tabulation not allowed
print("Error. Tabulation at line: ", i)
exit()
elif sLine.startswith("@@@@GRAPH: "):
# rules graph call
m = re.match(r"@@@@GRAPH: *(\w+)", sLine.strip())
if m:
sGraphName = m.group(1)
if sGraphName in dAllGraph:
print("Error. Group name " + sGraphName + " already exists.")
exit()
dAllGraph[sGraphName] = []
else:
print("Error. Graph name not found at line", i)
exit()
elif sLine.startswith("__") and sLine.endswith("__"):
# new rule group
m = re.match("__(\\w+)(!\\d|)__", sLine)
if m:
sRuleName = m.group(1)
nPriority = int(m.group(2)[1:]) if m.group(2) else 4
else:
print("Error at rule group: ", sLine, " -- line:", i)
break
elif re.match("[ ]*$", sLine):
# empty line to end merging
if not lTokenLine:
continue
if not sActions:
print("Error. No action found at line:", i)
exit()
if not sGraphName:
print("Error. All rules must belong to a named graph. Line: ", i)
exit()
for j, sTokenLine in lTokenLine:
dAllGraph[sGraphName].append((j, sRuleName, sTokenLine, sActions, nPriority))
lTokenLine.clear()
sActions = ""
elif re.search(" +<<- ", sLine):
# actions
sActions += " " + sLine.strip()
elif sLine.startswith((" ")):
# tokens
lTokenLine.append([i, sLine.strip()])
else:
print("Unknown line:")
print(sLine)
# processing rules
print(" preparing rules...")
for sGraphName, lRuleLine in dAllGraph.items():
lPreparedRule = []
for i, sRuleGroup, sTokenLine, sActions, nPriority in lRuleLine:
for lRule in createRule(i, sRuleGroup, sTokenLine, sActions, nPriority):
lPreparedRule.append(lRule)
# Show rules
for e in lPreparedRule:
print(e)
# Graph creation
oDARG = darg.DARG(lPreparedRule, sLang)
dAllGraph[sGraphName] = oDARG.createGraph()
# creating file with all functions callable by rules
print(" creating callables...")
sPyCallables = "# generated code, do not edit\n"
#sJSCallables = "// generated code, do not edit\nconst oEvalFunc = {\n"
for sFuncName, sReturn in dFUNCTIONS.items():
if sFuncName.startswith("g_c_"): # condition
sParams = "lToken, nTokenOffset, sCountry, bCondMemo"
elif sFuncName.startswith("g_m_"): # message
sParams = "lToken, nTokenOffset"
elif sFuncName.startswith("g_s_"): # suggestion
sParams = "lToken, nTokenOffset"
elif sFuncName.startswith("g_p_"): # preprocessor
sParams = "lToken"
elif sFuncName.startswith("g_d_"): # disambiguator
sParams = "lToken, nTokenOffset"
else:
print("# Unknown function type in [" + sFuncName + "]")
continue
sPyCallables += "def {} ({}):\n".format(sFuncName, sParams)
sPyCallables += " return " + sReturn + "\n"
#sJSCallables += " {}: function ({})".format(sFuncName, sParams) + " {\n"
#sJSCallables += " return " + jsconv.py2js(sReturn) + ";\n"
#sJSCallables += " },\n"
#sJSCallables += "}\n"
print(sPyCallables)
for sActionName, aAction in dACTIONS.items():
print(sActionName, aAction)
# Result
d = {
"graph_callables": sPyCallables,
"rules_graphs": dAllGraph,
"rules_actions": dACTIONS
}
return d