#!/usr/bin/env python
# tconfpy.py
# Copyright (c) 2003-2004 TundraWare Inc. All Rights Reserved.
# For Updates See: http://www.tundraware.com/Software/tconfpy
# Program Information
PROGNAME = "tconfpy"
RCSID = "$Id: tconfpy.py,v 1.109 2004/03/12 10:14:02 tundra Exp $"
VERSION = RCSID.split()[2]
# Copyright Information
CPRT = chr(169)
DATE = "2003-2004"
OWNER = "TundraWare Inc."
RIGHTS = "All Rights Reserved"
COPYRIGHT = "Copyright %s %s %s, %s." % (CPRT, DATE, OWNER, RIGHTS)
PROGINFO = PROGNAME + " " + VERSION
BANNER = "%s\n%s\n%s\n" % (PROGINFO, COPYRIGHT, RCSID)
#----------------------------------------------------------#
# Variables User Might Change #
#----------------------------------------------------------#
#------------------- Nothing Below Here Should Need Changing -----------------#
#----------------------------------------------------------#
# Public Features Of This Module #
#----------------------------------------------------------#
__all__ = ["ParseConfig"]
#----------------------------------------------------------#
# Imports #
#----------------------------------------------------------#
import os.path
import re
#----------------------------------------------------------#
# Aliases & Redefinitions #
#----------------------------------------------------------#
#----------------------------------------------------------#
# Constants & Literals #
#----------------------------------------------------------#
###########
# Constants
###########
# Formatting Constants
MSGPOS = 10 # Where to start message output
FILENUM = "[File: %s Line: %s]" # Display filename and linenum
PTR = " ---> " # Textual pointer for debug output
# Reserved Symbols
COMMENT = r'#' # Comment introducer character
DELIML = r'[' # Left delimiter for vbl reference
DELIMR = r']' # Right delimiter for vbl reference
DOLLAR = r'$' # Used to note enviro vbl
# Control and conditional symbols
INCLUDE = ".include"
ENDIF = ".endif"
IF = ".if"
# Table of reserved symbols used by parser. User is able
# to include this in the right side of a variable definition
# via [reserved sym].
Reserved = {"DELIML" : DELIML,
"DELIMR" : DELIMR,
"DOLLAR" : DOLLAR,
"HASH" : COMMENT,
"INCLUDE" : INCLUDE,
"ENDIF" : ENDIF,
"IF" : IF
}
# Regular Expressions
reVARREF = r"\%s.+?\%s" % (DELIML, DELIMR) # Variable reference
VARREF = re.compile(reVARREF)
###########
# Literals
###########
#----------------------------------------------------------#
# Global Variables & Data Structures #
#----------------------------------------------------------#
DEBUG = False # Control Debug output
IGNORECASE = False # Case observed by default
DebugMsg = [] # Place to store and return debug info
ErrMsgs = [] # Place to store and return errors
WarnMsgs = [] # Place to store and return warnings
CondStack = [True,] # Conditional stack
SymTable = {} # Results of the parsing stored here
TotalLines = 0 # Total number of lines parsed
#----------------------------------------------------------#
# Prompts, & Application Strings #
#----------------------------------------------------------#
##########
# Debug Messages
##########
dDEBUG = "DEBUG"
dLINEIGNORE = FILENUM + " Line Ignored/Not Included" + PTR + "%s\n"
dNUMLINES = "Processing File '%s' Resulted In %d Total Lines Parsed"
dPARSEDLINE = FILENUM + " %s" + PTR + "%s\n"
###########
# Error Messages
###########
eCONFOPEN = "Cannot Open The File '%s'"
eENDIFEXTRA = FILENUM + " " + ENDIF + " Without Matching Condition"
eERROR = "ERROR"
###########
# Prompts
###########
###########
# Warning Messages
###########
wENDIFBAD = FILENUM + " Text After " + ENDIF + " Ignored"
wWARNING = "WARNING"
#--------------------------- Code Begins Here ---------------------------------#
#----------------------------------------------------------#
# Object Base Class Definitions #
#----------------------------------------------------------#
#----------------------------------------------------------#
# Utility Function Definitions #
#----------------------------------------------------------#
##########
# Create A Debug Message
##########
def DebugMsg(dmsg):
global DebugMsgs
DebugMsgs.append(mkmsg(dmsg, dDEBUG))
# End of 'DebugMsg()'
##########
# Create An Error Message
##########
def ErrorMsg(error):
global ErrMsgs
ErrMsgs.append(mkmsg(error + "!", eERROR))
# End of 'ErrorMsg()'
##########
# Create A Warning Message
##########
def WarningMsg(warning):
global WarnMsgs
WarnMsgs.append(mkmsg(warning + "!", wWARNING))
# End of 'WarningMsg()'
##########
# Construct A Standard Application Message String
##########
def mkmsg(msg, msgtype=""):
if msgtype:
msgtype += ">"
pad = " " * (MSGPOS - len(msgtype))
return "%s %s%s%s" % (PROGINFO, msgtype, pad, msg)
# End of 'mkmsg()'
#----------------------------------------------------------#
# Entry Point On Direct Invocation #
#----------------------------------------------------------#
if __name__ == '__main__':
print BANNER
#----------------------------------------------------------#
# Public API To Module #
#----------------------------------------------------------#
def ParseConfig(cfgfile, Options={}, IgnoreCase=False, debug=False):
global DebugMsgs, ErrMsgs, WarnMsgs
global CondStack, DEBUG, IGNORECASE, SymTable, TotalLines
# Initialize the globals
DEBUG = debug
IGNORECASE = IgnoreCase
DebugMsgs = []
ErrMsgs = []
WarnMsgs = []
CondStack = [True,]
SymTable = Options
TotalLines = 0
# Parse the file
ParseFile(cfgfile)
# Return the parsing results
if DEBUG:
DebugMsg(dNUMLINES %(cfgfile, TotalLines))
return (SymTable, ErrMsgs, WarnMsgs, DebugMsgs)
# End of 'ParseConfig()'
#----------------------------------------------------------#
# Parser Support Functions #
#----------------------------------------------------------#
##########
# Condition A Line - Remove Comments & Leading/Trailing Whitespace
##########
def ConditionLine(line):
return line.split(COMMENT)[0].strip()
# End of 'ConditionLine()'
##########
# Parse A File
##########
def ParseFile(cfgfile):
global IgnoreCase, MsgList, SymTable, TotalLines
try:
cf = open(cfgfile)
# Successful open of config file - Begin processing it
linenum=0
# Process and massage the configuration file
for line in cf.read().splitlines():
linenum += 1
TotalLines += 1
# Parse this line
ParseLine(line, cfgfile, linenum)
# Close the config file
cf.close()
# File open failed for some reason
except:
ErrorMsg(eCONFOPEN % cfgfile) # Record the error
# End of 'ParseFile()'
##########
# Parse A Line
##########
def ParseLine(line, cfgfile, linenum):
global CondStack, MsgList, SymTable
orig = line # May need copy of original for debug output
line = ConditionLine(line)
##########
# Beginning Of Line Parser
##########
# Only attempt on non-blank lines
if line:
#####
# .endif Processing - Must be done before state check
# because .endif can change state
#####
if line.startswith(ENDIF):
# This should be the only thing on the line
if line != ENDIF:
WarningMsg(wENDIFBAD % (cfgfile, linenum))
# Remove one level of nesting
CondStack.pop()
# Error, if there are more .endifs than conditionals
if not CondStack:
ErrorMsg(eENDIFEXTRA % (cfgfile, linenum))
CondStack.append(False) # Inhibit further parsing
#####
# Check State Of Parser
#####
if not CondStack[-1]:
if DEBUG:
DebugMsg(dLINEIGNORE %(cfgfile, linenum, orig))
return
#####
# .include Processing
#####
if line.startswith(INCLUDE):
ParseFile(line.split(INCLUDE)[1].strip())
#####
# Replace Explicit References To Reserved Symbols
#####
else:
for ref in Reserved.keys():
line = line.replace("%s%s%s" % (DELIML, ref, DELIMR), Reserved[ref])
##########
# End Of Line Parser
##########
if DEBUG:
DebugMsg(dPARSEDLINE %(cfgfile, linenum, orig, line))
# End of 'ParseLine'
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