218 lines
6.6 KiB
Python
218 lines
6.6 KiB
Python
# -*- coding: utf-8 -*-
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"""
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configfile.py - Human-readable text configuration file library
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Copyright 2010 Luke Campagnola
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Distributed under MIT/X11 license. See license.txt for more infomation.
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Used for reading and writing dictionary objects to a python-like configuration
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file format. Data structures may be nested and contain any data type as long
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as it can be converted to/from a string using repr and eval.
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"""
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import re, os, sys
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from .pgcollections import OrderedDict
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GLOBAL_PATH = None # so not thread safe.
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from . import units
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from .python2_3 import asUnicode
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from .Qt import QtCore
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from .Point import Point
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from .colormap import ColorMap
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import numpy
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class ParseError(Exception):
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def __init__(self, message, lineNum, line, fileName=None):
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self.lineNum = lineNum
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self.line = line
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#self.message = message
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self.fileName = fileName
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Exception.__init__(self, message)
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def __str__(self):
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if self.fileName is None:
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msg = "Error parsing string at line %d:\n" % self.lineNum
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else:
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msg = "Error parsing config file '%s' at line %d:\n" % (self.fileName, self.lineNum)
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msg += "%s\n%s" % (self.line, self.message)
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return msg
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#raise Exception()
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def writeConfigFile(data, fname):
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s = genString(data)
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fd = open(fname, 'w')
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fd.write(s)
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fd.close()
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def readConfigFile(fname):
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#cwd = os.getcwd()
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global GLOBAL_PATH
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if GLOBAL_PATH is not None:
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fname2 = os.path.join(GLOBAL_PATH, fname)
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if os.path.exists(fname2):
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fname = fname2
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GLOBAL_PATH = os.path.dirname(os.path.abspath(fname))
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try:
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#os.chdir(newDir) ## bad.
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fd = open(fname)
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s = asUnicode(fd.read())
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fd.close()
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s = s.replace("\r\n", "\n")
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s = s.replace("\r", "\n")
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data = parseString(s)[1]
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except ParseError:
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sys.exc_info()[1].fileName = fname
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raise
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except:
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print("Error while reading config file %s:"% fname)
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raise
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#finally:
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#os.chdir(cwd)
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return data
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def appendConfigFile(data, fname):
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s = genString(data)
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fd = open(fname, 'a')
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fd.write(s)
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fd.close()
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def genString(data, indent=''):
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s = ''
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for k in data:
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sk = str(k)
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if len(sk) == 0:
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print(data)
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raise Exception('blank dict keys not allowed (see data above)')
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if sk[0] == ' ' or ':' in sk:
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print(data)
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raise Exception('dict keys must not contain ":" or start with spaces [offending key is "%s"]' % sk)
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if isinstance(data[k], dict):
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s += indent + sk + ':\n'
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s += genString(data[k], indent + ' ')
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else:
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s += indent + sk + ': ' + repr(data[k]) + '\n'
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return s
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def parseString(lines, start=0):
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data = OrderedDict()
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if isinstance(lines, basestring):
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lines = lines.split('\n')
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lines = [l for l in lines if re.search(r'\S', l) and not re.match(r'\s*#', l)] ## remove empty lines
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indent = measureIndent(lines[start])
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ln = start - 1
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try:
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while True:
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ln += 1
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#print ln
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if ln >= len(lines):
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break
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l = lines[ln]
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## Skip blank lines or lines starting with #
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if re.match(r'\s*#', l) or not re.search(r'\S', l):
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continue
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## Measure line indentation, make sure it is correct for this level
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lineInd = measureIndent(l)
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if lineInd < indent:
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ln -= 1
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break
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if lineInd > indent:
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#print lineInd, indent
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raise ParseError('Indentation is incorrect. Expected %d, got %d' % (indent, lineInd), ln+1, l)
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if ':' not in l:
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raise ParseError('Missing colon', ln+1, l)
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(k, p, v) = l.partition(':')
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k = k.strip()
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v = v.strip()
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## set up local variables to use for eval
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local = units.allUnits.copy()
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local['OrderedDict'] = OrderedDict
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local['readConfigFile'] = readConfigFile
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local['Point'] = Point
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local['QtCore'] = QtCore
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local['ColorMap'] = ColorMap
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# Needed for reconstructing numpy arrays
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local['array'] = numpy.array
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for dtype in ['int8', 'uint8',
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'int16', 'uint16', 'float16',
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'int32', 'uint32', 'float32',
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'int64', 'uint64', 'float64']:
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local[dtype] = getattr(numpy, dtype)
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if len(k) < 1:
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raise ParseError('Missing name preceding colon', ln+1, l)
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if k[0] == '(' and k[-1] == ')': ## If the key looks like a tuple, try evaluating it.
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try:
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k1 = eval(k, local)
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if type(k1) is tuple:
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k = k1
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except:
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pass
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if re.search(r'\S', v) and v[0] != '#': ## eval the value
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try:
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val = eval(v, local)
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except:
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ex = sys.exc_info()[1]
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raise ParseError("Error evaluating expression '%s': [%s: %s]" % (v, ex.__class__.__name__, str(ex)), (ln+1), l)
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else:
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if ln+1 >= len(lines) or measureIndent(lines[ln+1]) <= indent:
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#print "blank dict"
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val = {}
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else:
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#print "Going deeper..", ln+1
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(ln, val) = parseString(lines, start=ln+1)
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data[k] = val
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#print k, repr(val)
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except ParseError:
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raise
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except:
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ex = sys.exc_info()[1]
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raise ParseError("%s: %s" % (ex.__class__.__name__, str(ex)), ln+1, l)
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#print "Returning shallower..", ln+1
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return (ln, data)
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def measureIndent(s):
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n = 0
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while n < len(s) and s[n] == ' ':
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n += 1
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return n
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if __name__ == '__main__':
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import tempfile
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fn = tempfile.mktemp()
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tf = open(fn, 'w')
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cf = """
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key: 'value'
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key2: ##comment
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##comment
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key21: 'value' ## comment
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##comment
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key22: [1,2,3]
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key23: 234 #comment
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"""
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tf.write(cf)
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tf.close()
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print("=== Test:===")
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num = 1
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for line in cf.split('\n'):
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print("%02d %s" % (num, line))
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num += 1
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print(cf)
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print("============")
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data = readConfigFile(fn)
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print(data)
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os.remove(fn)
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