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#Copyright ReportLab Europe Ltd. 2000-2004
#see license.txt for license details
#history http://www.reportlab.co.uk/cgi-bin/viewcvs.cgi/public/reportlab/trunk/reportlab/lib/yaml.py
# parses "Yet Another Markup Language" into a list of tuples.
# Each tuple says what the data is e.g.
# ('Paragraph', 'Heading1', 'Why Reportlab Rules')
# and the pattern depends on type.
"""
.h1 Welcome to YAML!
YAML is "Yet Another Markup Language" - a markup language
which is easier to type in than XML, yet gives us a
reasonable selection of formats.
The general rule is that if a line begins with a '.',
it requires special processing. Otherwise lines
are concatenated to paragraphs, and blank lines
separate paragraphs.
If the line ".foo bar bletch" is encountered,
it immediately ends and writes out any current
paragraph.
It then looks for a parser method called 'foo';
if found, it is called with arguments (bar, bletch).
If this is not found, it assumes that 'foo' is a
paragraph style, and the text for the first line
of the paragraph is 'bar bletch'. It would be
up to the formatter to decide whether on not 'foo'
was a valid paragraph.
Special commands understood at present are:
dot image filename
- adds the image to the document
dot beginPre Code
- begins a Preformatted object in style 'Code'
dot endPre
- ends a preformatted object.
"""
__version__=''' $Id: yaml.py 2385 2004-06-17 15:26:05Z rgbecker $ '''
import sys
import string
#modes:
PLAIN = 1
PREFORMATTED = 2
BULLETCHAR = '\267' # assumes font Symbol, but works on all platforms
class BaseParser:
""""Simplest possible parser with only the most basic options.
This defines the line-handling abilities and basic mechanism.
The class YAMLParser includes capabilities for a fairly rich
story."""
def __init__(self):
self.reset()
def reset(self):
self._lineNo = 0
self._style = 'Normal' # the default
self._results = []
self._buf = []
self._mode = PLAIN
def parseFile(self, filename):
#returns list of objects
data = open(filename, 'r').readlines()
for line in data:
#strip trailing newlines
self.readLine(line[:-1])
self.endPara()
return self._results
def parseText(self, textBlock):
"Parses the a possible multi-line text block"
lines = string.split(textBlock, '\n')
for line in lines:
self.readLine(line)
self.endPara()
return self._results
def readLine(self, line):
#this is the inner loop
self._lineNo = self._lineNo + 1
stripped = string.lstrip(line)
if len(stripped) == 0:
if self._mode == PLAIN:
self.endPara()
else: #preformatted, append it
self._buf.append(line)
elif line[0]=='.':
# we have a command of some kind
self.endPara()
words = string.split(stripped[1:])
cmd, args = words[0], words[1:]
#is it a parser method?
if hasattr(self.__class__, cmd):
method = eval('self.'+cmd)
#this was very bad; any type error in the method was hidden
#we have to hack the traceback
try:
apply(method, tuple(args))
except TypeError, err:
sys.stderr.write("Parser method: apply(%s,%s) %s at line %d\n" % (cmd, tuple(args), err, self._lineNo))
raise
else:
# assume it is a paragraph style -
# becomes the formatter's problem
self.endPara() #end the last one
words = string.split(stripped, ' ', 1)
assert len(words)==2, "Style %s but no data at line %d" % (words[0], self._lineNo)
(styletag, data) = words
self._style = styletag[1:]
self._buf.append(data)
else:
#we have data, add to para
self._buf.append(line)
def endPara(self):
#ends the current paragraph, or preformatted block
text = string.join(self._buf, ' ')
if text:
if self._mode == PREFORMATTED:
#item 3 is list of lines
self._results.append(('PREFORMATTED', self._style,
string.join(self._buf,'\n')))
else:
self._results.append(('PARAGRAPH', self._style, text))
self._buf = []
self._style = 'Normal'
def beginPre(self, stylename):
self._mode = PREFORMATTED
self._style = stylename
def endPre(self):
self.endPara()
self._mode = PLAIN
def image(self, filename):
self.endPara()
self._results.append(('IMAGE', filename))
class Parser(BaseParser):
"""This adds a basic set of "story" components compatible with HTML & PDF.
Images, spaces"""
def vSpace(self, points):
"""Inserts a vertical spacer"""
self._results.append(('VSpace', points))
def pageBreak(self):
"""Inserts a frame break"""
self._results.append(('PageBreak','blah')) # must be a tuple
def custom(self, moduleName, funcName):
"""Goes and gets the Python object and adds it to the story"""
self.endPara()
self._results.append(('Custom',moduleName, funcName))
def nextPageTemplate(self, templateName):
self._results.append(('NextPageTemplate',templateName))
def parseFile(filename):
p = Parser()
return p.parseFile(filename)
def parseText(textBlock):
p = Parser()
return p.parseText(textBlock)
if __name__=='__main__': #NORUNTESTS
if len(sys.argv) <> 2:
results = parseText(__doc__)
else:
results = parseFile(sys.argv[1])
import pprint
pprint.pprint(results)
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