"""
Grammalecte: compile rules
Create a Direct Acyclic Rule Graphs (DARGs)
"""
import re
import traceback
import json
import darg
dACTIONS = {}
dFUNCTIONS = {}
def prepareFunction (s, bTokenValue=False):
"convert simple rule syntax to a string of Python code"
s = s.replace("__also__", "bCondMemo")
s = s.replace("__else__", "not bCondMemo")
s = re.sub(r"(morph|analyse|displayInfo)[(]\\(\d+)", 'g_\\1(lToken[\\2+nTokenOffset]', s)
s = re.sub(r"(select|exclude|define)[(][\\](\d+)", 'g_\\1(lToken[\\2+nTokenOffset]', s)
s = re.sub(r"(tag_before|tag_after)[(][\\](\d+)", 'g_\\1(lToken[\\2+nTokenOffset], dTags', s)
s = re.sub(r"(switchGender|has(?:Mas|Fem)Form)[(]\\(\d+)", '\\1(lToken[\\2+nTokenOffset]["sValue"]', s)
s = re.sub(r"(morph|analyse)\(>1", 'g_\\1(lToken[nLastToken+1]', s) # next token
s = re.sub(r"(morph|analyse)\(<1", 'g_\\1(lToken[nTokenOffset]', s) # previous token
s = re.sub(r"[\\](\d+)\.is(upper|lower|title)\(\)", 'lToken[\\1+nTokenOffset]["sValue"].is\\2()', s)
s = re.sub(r"\bspell *[(]", '_oSpellChecker.isValid(', s)
s = re.sub(r"\bbefore\(\s*", 'look(sSentence[:lToken[1+nTokenOffset]["nStart"]], ', s) # before(s)
s = re.sub(r"\bafter\(\s*", 'look(sSentence[lToken[nLastToken]["nEnd"]:], ', s) # after(s)
s = re.sub(r"\bbefore0\(\s*", 'look(sSentence0[:lToken[1+nTokenOffset]["nStart"]], ', s) # before0(s)
s = re.sub(r"\bafter0\(\s*", 'look(sSentence[lToken[nLastToken]["nEnd"]:], ', s) # after0(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, dDef):
"tokenize a string and return a list of lines of tokens"
lToken = sTokenLine.split()
lTokenLines = None
for sToken in lToken:
# optional token?
bNullPossible = sToken.startswith("?") and sToken.endswith("¿")
if bNullPossible:
sToken = sToken[1:-1]
# token with definition?
if sToken.startswith("({") and sToken.endswith("})") and sToken[1:-1] in dDef:
sToken = "(" + dDef[sToken[1:-1]] + ")"
elif sToken.startswith("{") and sToken.endswith("}") and sToken in dDef:
sToken = dDef[sToken]
if ( (sToken.startswith("[") and sToken.endswith("]")) or (sToken.startswith("([") and sToken.endswith("])")) ):
# multiple token
bSelectedGroup = sToken.startswith("(") and sToken.endswith(")")
if bSelectedGroup:
sToken = sToken[1:-1]
lNewToken = sToken[1:-1].split("|")
if not lTokenLines:
lTokenLines = [ [s] for s in lNewToken ]
if bNullPossible:
lTokenLines.extend([ [] for i in range(len(lNewToken)+1) ])
else:
lNewTemp = []
if bNullPossible:
for aRule in lTokenLines:
for sElem in lNewToken:
aNewRule = list(aRule)
aNewRule.append(sElem)
lNewTemp.append(aNewRule)
else:
sElem1 = lNewToken.pop(0)
for aRule in lTokenLines:
for sElem in lNewToken:
aNewRule = list(aRule)
aNewRule.append("(" + sElem + ")" if bSelectedGroup else sElem)
lNewTemp.append(aNewRule)
aRule.append("(" + sElem1 + ")" if bSelectedGroup else sElem1)
lTokenLines.extend(lNewTemp)
else:
# simple token
if not lTokenLines:
lTokenLines = [[sToken], []] if bNullPossible else [[sToken]]
else:
if bNullPossible:
lNewTemp = []
for aRule in lTokenLines:
lNew = list(aRule)
lNew.append(sToken)
lNewTemp.append(lNew)
lTokenLines.extend(lNewTemp)
else:
for aRule in lTokenLines:
aRule.append(sToken)
for aRule in lTokenLines:
yield aRule
def createRule (iLine, sRuleName, sTokenLine, iActionBlock, sActions, nPriority, dDef):
"generator: create rule as list"
# print(iLine, "//", sRuleName, "//", sTokenLine, "//", sActions, "//", nPriority)
for lToken in genTokenLines(sTokenLine, dDef):
# 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 iAction, sAction in enumerate(sActions.split(" <<- "), 1):
sAction = sAction.strip()
if sAction:
sActionId = sRuleName + "__b" + str(iActionBlock) + "_a" + str(iAction) + "_" + str(len(lToken))
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 (sText, dPos):
"change group reference in <sText> with values in <dPos>"
for i in range(len(dPos), 0, -1):
sText = sText.replace("\\"+str(i), "\\"+str(dPos[i]))
return sText
def checkTokenNumbers (sText, sActionId, nToken):
"check if token references in <sText> greater than <nToken> (debugging)"
for x in re.finditer(r"\\(\d+)", sText):
if int(x.group(1)) > nToken:
print("# Error in token index at line " + sActionId + " ("+str(nToken)+" tokens only)")
print(sText)
def checkIfThereIsCode (sText, sActionId):
"check if there is code in <sText> (debugging)"
if re.search("[.]\\w+[(]|sugg\\w+[(]|\\([0-9]|\\[[0-9]", sText):
print("# Warning at line " + sActionId + ": This message looks like code. Line should probably begin with =")
print(sText)
def createAction (sActionId, sAction, nPriority, nToken, dPos):
"create action rule as a list"
# 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: ", sActionId)
print(" ==", sAction, "==")
return None
# Condition
sCondition = sAction[:m.start()].strip()
if sCondition:
sCondition = prepareFunction(sCondition)
sCondition = changeReferenceToken(sCondition, dPos)
dFUNCTIONS["_g_c_"+sActionId] = sCondition
sCondition = "_g_c_"+sActionId
else:
sCondition = ""
# Action
cAction = m.group("action")
sAction = sAction[m.end():].strip()
sAction = changeReferenceToken(sAction, dPos)
if not m.group("start"):
iStartAction = 1
iEndAction = 0
else:
iStartAction = int(m.group("start"))
iEndAction = int(m.group("end")[1:]) if m.group("end") else iStartAction
if dPos and m.group("start"):
try:
iStartAction = dPos[iStartAction]
if iEndAction:
iEndAction = dPos[iEndAction]
except:
print("# Error. Wrong groups in: " + sActionId)
print(" iStartAction:", iStartAction, "iEndAction:", iEndAction)
print(" ", dPos)
if cAction == "-":
## error
iMsg = sAction.find(" # ")
if iMsg == -1:
sMsg = "# Error. Error message not found."
sURL = ""
print(sMsg + " Action id: " + sActionId)
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()
checkTokenNumbers(sMsg, sActionId, nToken)
if sMsg[0:1] == "=":
sMsg = prepareFunction(sMsg[1:], True)
dFUNCTIONS["g_m_"+sActionId] = sMsg
sMsg = "=g_m_"+sActionId
else:
checkIfThereIsCode(sMsg, sActionId)
# checking consistancy
checkTokenNumbers(sAction, sActionId, nToken)
if cAction == ">":
## no action, break loop if condition is False
return [sOption, sCondition, cAction, ""]
if not sAction:
print("# Error in action at line " + sActionId + ": This action is empty.")
if sAction[0:1] != "=":
checkIfThereIsCode(sAction, sActionId)
if cAction == "-":
## error detected --> suggestion
if sAction[0:1] == "=":
sAction = prepareFunction(sAction, True)
dFUNCTIONS["_g_s_"+sActionId] = sAction[1:]
sAction = "=_g_s_"+sActionId
elif sAction.startswith('"') and sAction.endswith('"'):
sAction = sAction[1:-1]
if not sMsg:
print("# Error in action at line " + sActionId + ": The message is empty.")
return [sOption, sCondition, cAction, sAction, iStartAction, iEndAction, nPriority, sMsg, sURL]
elif cAction == "~":
## text processor
if sAction[0:1] == "=":
sAction = prepareFunction(sAction, True)
dFUNCTIONS["_g_p_"+sActionId] = sAction[1:]
sAction = "=_g_p_"+sActionId
elif sAction.startswith('"') and sAction.endswith('"'):
sAction = sAction[1:-1]
return [sOption, sCondition, cAction, sAction, iStartAction, iEndAction]
elif cAction == "/":
## tags
return [sOption, sCondition, cAction, sAction, iStartAction, iEndAction]
elif cAction == "=":
## disambiguator
if sAction[0:1] == "=":
sAction = sAction[1:]
if "define" in sAction and not re.search(r"define\(\\\d+ *, *\[.*\] *\)", sAction):
print("# Error in action at line " + sActionId + ": second argument for <define> must be a list of strings")
sAction = prepareFunction(sAction)
dFUNCTIONS["_g_d_"+sActionId] = sAction
sAction = "_g_d_"+sActionId
return [sOption, sCondition, cAction, sAction]
else:
print("# Unknown action at line " + sActionId)
return None
def make (lRule, dDef, 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 = ""
iActionBlock = 0
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)
iActionBlock = 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.search("^ +<<- ", sLine) or sLine.startswith(" ") \
or re.search("^ +#", sLine) or re.search(r"^ [-~=>/](?:\d(?::\d+|)|)>> ", sLine) :
# actions
sActions += " " + sLine.strip()
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, iActionBlock, sActions, nPriority))
lTokenLine.clear()
sActions = ""
iActionBlock += 1
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, iActionBlock, sActions, nPriority in lRuleLine:
for lRule in createRule(i, sRuleGroup, sTokenLine, iActionBlock, sActions, nPriority, dDef):
lPreparedRule.append(lRule)
# Graph creation
oDARG = darg.DARG(lPreparedRule, sLang)
dAllGraph[sGraphName] = oDARG.createGraph()
# Debugging
#print("\nGRAPH:", sGraphName)
#for e in lPreparedRule:
# print(e)
#for k, v in dAllGraph[sGraphName].items():
# print(k, "\t", v)
# 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, nLastToken, sCountry, bCondMemo, dTags, sSentence, sSentence0"
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, nTokenOffset"
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"
# Debugging
if False:
print("\nActions:")
for sActionName, aAction in dACTIONS.items():
print(sActionName, aAction)
print("\nFunctions:")
print(sPyCallables)
# Result
return {
"graph_callables": sPyCallables,
"rules_graphs": dAllGraph,
"rules_actions": dACTIONS
}