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import re
import string
def indentLevel(line):
n = 0
while n < len(line) and line[n] == ' ':
n = n + 1
return n
class LineNumberStream:
def __init__(self, filename=None):
self.curLine = 0
self.filename = filename
def get(self):
line = self.getLine()
self.curLine += 1 # used by subclass
if line:
line = noLineFeed(line)
return line
def lastLineRead(self):
return self.curLine
class FileStream(LineNumberStream):
def __init__(self, filename):
self.fp = open(filename)
LineNumberStream.__init__(self, filename)
def getLine(self):
line = self.fp.readline()
if line == '': line = None
return line
class StringStream(LineNumberStream):
def __init__(self, text):
self.lines = split(text)
self.numLines = len(self.lines)
LineNumberStream.__init__(self)
def getLine(self):
if self.curLine < self.numLines:
return self.lines[self.curLine]
def split(text):
lines = string.split(text, '\n')
if lines[-1] == '':
lines.pop()
return lines
def eatNewLines(stream):
while 1:
line = stream.get()
if line is None or len(string.strip(line)):
return line
COMMENT_LINE_REGEX = re.compile(R"\s*#")
def isComment(line):
return line is not None and COMMENT_LINE_REGEX.match(line)
class CommentEater:
def __init__(self, stream):
self.stream = stream
self.peeked = 1
self.line = eatNewLines(stream)
self.eatComments()
def eatComments(self):
while isComment(self.line):
self.line = self.stream.get()
def peek(self):
if self.peeked:
return self.line
self.peeked = 1
self.line = self.stream.get()
self.eatComments()
return self.line
def lastLineRead(self):
return self.stream.lastLineRead()
def pop(self):
data = self.peek()
self.peeked = 0
return data
class NestedText:
def __init__(self, stream):
self.commentEater = CommentEater(stream)
self.reset()
def lastLineRead(self):
return self.commentEater.lastLineRead()
def reset(self):
self.indentLevel = 0
self.oldIndents = [0]
def peek(self):
nextLine = self.commentEater.peek()
if nextLine is not None:
if indentLevel(nextLine) >= self.indentLevel:
return nextLine[self.indentLevel:]
elif nextLine == '':
return ''
def pop(self):
line = self.peek()
if line is None:
self.indentLevel = self.oldIndents.pop()
return
self.commentEater.pop()
return line
def popNestedLines(self):
nextLine = self.peek()
if nextLine is None or nextLine == '' or nextLine[0] != ' ':
return []
self.nestToNextLine()
lines = []
while 1:
line = self.pop()
if line is None:
break
lines.append(line)
return lines
def nestToNextLine(self):
line = self.commentEater.peek()
indentation = indentLevel(line)
if len(self.oldIndents) > 1 and indentation <= self.indentLevel:
self.error("Inadequate indentation", line)
self.setNewIndent(indentation)
def nestBySpecificAmount(self, adjust):
self.setNewIndent(self.indentLevel + adjust)
def setNewIndent(self, indentLevel):
self.oldIndents.append(self.indentLevel)
self.indentLevel = indentLevel
class YamlLoaderException(Exception):
def __init__(self, *args):
(self.msg, self.lineNum, self.line, self.filename) = args
def __str__(self):
msg = """\
%(msg)s:
near line %(lineNum)d:
%(line)s
""" % self.__dict__
if self.filename:
msg += "file: " + self.filename
return msg
class NestedDocs(NestedText):
def __init__(self, stream):
self.filename = stream.filename
NestedText.__init__(self,stream)
line = NestedText.peek(self)
self.sep = '---'
if self.startsWithSep(line):
self.eatenDocSep = NestedText.pop(self)
else:
self.eatenDocSep = self.sep
def startsWithSep(self,line):
if line and self.sep == line[:3]: return 1
return 0
def popDocSep(self):
line = self.eatenDocSep
self.eatenDocSep = None
self.reset()
return line
def pop(self):
if self.eatenDocSep is not None:
raise "error"
line = self.commentEater.peek()
if line and self.startsWithSep(line):
self.eatenDocSep = NestedText.pop(self)
return None
return NestedText.pop(self)
def error(self, msg, line):
raise YamlLoaderException(msg, self.lastLineRead(), line, self.filename)
def noLineFeed(s):
while s[-1:] in ('\n', '\r'):
s = s[:-1]
return s
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