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#! /usr/bin/env python -- # -*- python -*-
##############################################################################
#
# Zope Public License (ZPL) Version 1.0
# -------------------------------------
#
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#
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# modification, are permitted provided that the following conditions are
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
# OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
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# This software consists of contributions made by Digital Creations and
# many individuals on behalf of Digital Creations. Specific
# attributions are listed in the accompanying credits file.
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##############################################################################
'''Structured Text Manipulation
Parse a structured text string into a form that can be used with
structured formats, like html.
Structured text is text that uses indentation and simple
symbology to indicate the structure of a document.
A structured string consists of a sequence of paragraphs separated by
one or more blank lines. Each paragraph has a level which is defined
as the minimum indentation of the paragraph. A paragraph is a
sub-paragraph of another paragraph if the other paragraph is the last
preceding paragraph that has a lower level.
Special symbology is used to indicate special constructs:
- A single-line paragraph whose immediately succeeding paragraphs are lower
level is treated as a header.
- A paragraph that begins with a '-', '*', or 'o' is treated as an
unordered list (bullet) element.
- A paragraph that begins with a sequence of digits followed by a
white-space character is treated as an ordered list element.
- A paragraph that begins with a sequence of sequences, where each
sequence is a sequence of digits or a sequence of letters followed
by a period, is treated as an ordered list element.
- A paragraph with a first line that contains some text, followed by
some white-space and '--' is treated as
a descriptive list element. The leading text is treated as the
element title.
- Sub-paragraphs of a paragraph that ends in the word 'example' or the
word 'examples', or '::' is treated as example code and is output as is.
- Text enclosed single quotes (with white-space to the left of the
first quote and whitespace or puctuation to the right of the second quote)
is treated as example code.
- Text surrounded by '*' characters (with white-space to the left of the
first '*' and whitespace or puctuation to the right of the second '*')
is emphasized.
- Text surrounded by '**' characters (with white-space to the left of the
first '**' and whitespace or puctuation to the right of the second '**')
is made strong.
- Text surrounded by '_' underscore characters (with whitespace to the left
and whitespace or punctuation to the right) is made underlined.
- Text encloded by double quotes followed by a colon, a URL, and concluded
by punctuation plus white space, *or* just white space, is treated as a
hyper link. For example:
"Zope":http://www.zope.org/ is ...
Is interpreted as '<a href="http://www.zope.org/">Zope</a> is ....'
Note: This works for relative as well as absolute URLs.
- Text enclosed by double quotes followed by a comma, one or more spaces,
an absolute URL and concluded by punctuation plus white space, or just
white space, is treated as a hyper link. For example:
"mail me", mailto:[email protected].
Is interpreted as '<a href="mailto:[email protected]">mail me</a>.'
- Text enclosed in brackets which consists only of letters, digits,
underscores and dashes is treated as hyper links within the document.
For example:
As demonstrated by Smith [12] this technique is quite effective.
Is interpreted as '... by Smith <a href="#12">[12]</a> this ...'. Together
with the next rule this allows easy coding of references or end notes.
- Text enclosed in brackets which is preceded by the start of a line, two
periods and a space is treated as a named link. For example:
.. [12] "Effective Techniques" Smith, Joe ...
Is interpreted as '<a name="12">[12]</a> "Effective Techniques" ...'.
Together with the previous rule this allows easy coding of references or
end notes.
- A paragraph that has blocks of text enclosed in '||' is treated as a
table. The text blocks correspond to table cells and table rows are
denoted by newlines. By default the cells are center aligned. A cell
can span more than one column by preceding a block of text with an
equivalent number of cell separators '||'. Newlines and '|' cannot
be a part of the cell text. For example:
|||| **Ingredients** ||
|| *Name* || *Amount* ||
||Spam||10||
||Eggs||3||
is interpreted as::
<TABLE BORDER=1 CELLPADDING=2>
<TR>
<TD ALIGN=CENTER COLSPAN=2> <strong>Ingredients</strong> </TD>
</TR>
<TR>
<TD ALIGN=CENTER COLSPAN=1> <em>Name</em> </TD>
<TD ALIGN=CENTER COLSPAN=1> <em>Amount</em> </TD>
</TR>
<TR>
<TD ALIGN=CENTER COLSPAN=1>Spam</TD>
<TD ALIGN=CENTER COLSPAN=1>10</TD>
</TR>
<TR>
<TD ALIGN=CENTER COLSPAN=1>Eggs</TD>
<TD ALIGN=CENTER COLSPAN=1>3</TD>
</TR>
</TABLE>
$Id: StructuredText.py,v 1.23 1999/08/03 20:49:05 jim Exp $'''
# Copyright
#
# Copyright 1996 Digital Creations, L.C., 910 Princess Anne
# Street, Suite 300, Fredericksburg, Virginia 22401 U.S.A. All
# rights reserved. Copyright in this software is owned by DCLC,
# unless otherwise indicated. Permission to use, copy and
# distribute this software is hereby granted, provided that the
# above copyright notice appear in all copies and that both that
# copyright notice and this permission notice appear. Note that
# any product, process or technology described in this software
# may be the subject of other Intellectual Property rights
# reserved by Digital Creations, L.C. and are not licensed
# hereunder.
#
# Trademarks
#
# Digital Creations & DCLC, are trademarks of Digital Creations, L.C..
# All other trademarks are owned by their respective companies.
#
# No Warranty
#
# The software is provided "as is" without warranty of any kind,
# either express or implied, including, but not limited to, the
# implied warranties of merchantability, fitness for a particular
# purpose, or non-infringement. This software could include
# technical inaccuracies or typographical errors. Changes are
# periodically made to the software; these changes will be
# incorporated in new editions of the software. DCLC may make
# improvements and/or changes in this software at any time
# without notice.
#
# Limitation Of Liability
#
# In no event will DCLC be liable for direct, indirect, special,
# incidental, economic, cover, or consequential damages arising
# out of the use of or inability to use this software even if
# advised of the possibility of such damages. Some states do not
# allow the exclusion or limitation of implied warranties or
# limitation of liability for incidental or consequential
# damages, so the above limitation or exclusion may not apply to
# you.
#
#
# If you have questions regarding this software,
# contact:
#
# Jim Fulton, [email protected]
#
# (540) 371-6909
#
# $Log: StructuredText.py,v $
# Revision 1.23 1999/08/03 20:49:05 jim
# Fixed to allow list elements to introduce examples.
#
# Restructured _str using continue to avoid excessive nesting.
#
# Revision 1.22 1999/08/02 22:01:28 jim
# Fixed a bunch of bugs introduced by making ts_regex actually thread
# safe.
#
# Also localized a bunch of regular expressions
# using "static" variables (aka always default arguments).
#
# Revision 1.21 1999/08/02 13:26:52 jim
# paragraph_divider needs to be a regular (thread-unsafe) regex
# since it gets passed to ts_regex.split, which is thread-safe
# and wants to use regs.
#
# Revision 1.20 1999/07/21 13:33:59 jim
# untabified.
#
# Revision 1.19 1999/07/15 16:43:15 jim
# Checked in Scott Robertson's thread-safety fixes.
#
# Revision 1.18 1999/03/24 00:03:18 klm
# Provide for relative links, eg <a href="file_in_same_dir">whatever</a>,
# as:
#
# "whatever", :file_in_same_dir
#
# or
#
# "whatever"::file_in_same_dir
#
# .__init__(): relax the second gsub, using a '*' instead of a '+', so
# the stuff before the ':' can be missing, and also do postprocessing so
# any resulting '<a href=":file_in_same_dir">'s have the superfluous ':'
# removed. *Seems* good!
#
# Revision 1.17 1999/03/12 23:21:39 klm
# Gratuituous checkin to test my cvs *update* logging hook.
#
# Revision 1.16 1999/03/12 17:12:12 klm
# Added support for underlined elements, in the obvious way (and
# included an entry in the module docstring for it).
#
# Added an entry in the module docstring describing what i *guess* is
# the criterion for identifying header elements. (I'm going to have to
# delve into and understand the framework a bit better before *knowing*
# this is the case.)
#
# Revision 1.15 1999/03/11 22:40:18 klm
# Handle links that include '#' named links.
#
# Revision 1.14 1999/03/11 01:35:19 klm
# Fixed a small typo, and refined the module docstring link example, in
# order to do a checkin to exercise the CVS repository mirroring. Might
# as well include my last checkin message, with some substantial stuff:
#
# Links are now recognized whether or not the candidate strings are
# terminated with punctuation before the trailing whitespace. The old
# form - trailing punctuation then whitespace - is preserved, but the
# punctuation is now unnecessary.
#
# The regular expressions are a bit more complicated, but i've factored
# out the common parts and but them in variables with suggestive names,
# which may make them easier to understand.
#
# Revision 1.13 1999/03/11 00:49:57 klm
# Links are now recognized whether or not the candidate strings are
# terminated with punctuation before the trailing whitespace. The old
# form - trailing punctuation then whitespace - is preserved, but the
# punctuation is now unnecessary.
#
# The regular expressions are a bit more complicated, but i've factored
# out the common parts and but them in variables with suggestive names,
# which may make them easier to understand.
#
# Revision 1.12 1999/03/10 00:15:46 klm
# Committing with version 1.0 of the license.
#
# Revision 1.11 1999/02/08 18:13:12 klm
# Trival checkin (spelling fix "preceedeing" -> "preceding" and similar)
# to see what pitfalls my environment presents to accomplishing a
# successful checkin. (It turns out that i can't do it from aldous because
# the new version of cvs doesn't support the '-t' and '-f' options in the
# cvswrappers file...)
#
# Revision 1.10 1998/12/29 22:30:43 amos
# Improved doc string to describe hyper link and references capabilities.
#
# Revision 1.9 1998/12/04 20:15:31 jim
# Detabification and new copyright.
#
# Revision 1.8 1998/02/27 18:45:22 jim
# Various updates, including new indentation utilities.
#
# Revision 1.7 1997/12/12 15:39:54 jim
# Added level as argument for html_with_references.
#
# Revision 1.6 1997/12/12 15:27:25 jim
# Added additional pattern matching for HTML references.
#
# Revision 1.5 1997/03/08 16:01:03 jim
# Moved code to recognize: "foo bar", url.
# into object initializer, so it gets applied in all cases.
#
# Revision 1.4 1997/02/17 23:36:35 jim
# Added support for "foo title", http:/foohost/foo
#
# Revision 1.3 1996/12/06 15:57:37 jim
# Fixed bugs in character tags.
#
# Added -t command-line option to generate title if:
#
# - The first paragraph is one line (i.e. a heading) and
#
# - All other paragraphs are indented.
#
# Revision 1.2 1996/10/28 13:56:02 jim
# Fixed bug in ordered lists.
# Added option for either HTML-style headings or descriptive-list style
# headings.
#
# Revision 1.1 1996/10/23 14:00:45 jim
# *** empty log message ***
#
#
#
import ts_regex,regex
from ts_regex import gsub
from string import split, join, strip, find
def untabify(aString,
indent_tab=ts_regex.compile('\(\n\|^\)\( *\)\t').search_group,
):
'''\
Convert indentation tabs to spaces.
'''
result=''
rest=aString
while 1:
ts_results = indent_tab(rest, (1,2))
if ts_results:
start, grps = ts_results
lnl=len(grps[0])
indent=len(grps[1])
result=result+rest[:start]
rest="\n%s%s" % (' ' * ((indent/8+1)*8),
rest[start+indent+1+lnl:])
else:
return result+rest
def indent(aString, indent=2):
"""Indent a string the given number of spaces"""
r=split(untabify(aString),'\n')
if not r: return ''
if not r[-1]: del r[-1]
tab=' '*level
return "%s%s\n" % (tab,join(r,'\n'+tab))
def reindent(aString, indent=2, already_untabified=0):
"reindent a block of text, so that the minimum indent is as given"
if not already_untabified: aString=untabify(aString)
l=indent_level(aString)[0]
if indent==l: return aString
r=[]
append=r.append
if indent > l:
tab=' ' * (indent-l)
for s in split(aString,'\n'): append(tab+s)
else:
l=l-indent
for s in split(aString,'\n'): append(s[l:])
return join(r,'\n')
def indent_level(aString,
indent_space=ts_regex.compile('\n\( *\)').search_group,
):
'''\
Find the minimum indentation for a string, not counting blank lines.
'''
start=0
text='\n'+aString
indent=l=len(text)
while 1:
ts_results = indent_space(text, (1,2), start)
if ts_results:
start, grps = ts_results
i=len(grps[0])
start=start+i+1
if start < l and text[start] != '\n': # Skip blank lines
if not i: return (0,aString)
if i < indent: indent = i
else:
return (indent,aString)
def paragraphs(list,start):
l=len(list)
level=list[start][0]
i=start+1
while i < l and list[i][0] > level: i=i+1
return i-1-start
def structure(list):
if not list: return []
i=0
l=len(list)
r=[]
while i < l:
sublen=paragraphs(list,i)
i=i+1
r.append((list[i-1][1],structure(list[i:i+sublen])))
i=i+sublen
return r
class Table:
CELL=' <TD ALIGN=CENTER COLSPAN=%i>%s</TD>\n'
ROW=' <TR>\n%s </TR>\n'
TABLE='\n<TABLE BORDER=1 CELLPADDING=2>\n%s</TABLE>'
def create(self,aPar,td=ts_regex.compile(
'[ \t\n]*||\([^\0|]*\)').match_group):
'''parses a table and returns nested list representing the
table'''
self.table=[]
text=filter(None,split(aPar,'\n'))
for line in text:
row=[]
while 1:
pos=td(line,(1,))
if not pos:return 0
row.append(pos[1])
if pos[0]==len(line):break
line=line[pos[0]:]
self.table.append(row)
return 1
def html(self):
'''Creates an HTML representation of table'''
htmltable=[]
for row in self.table:
htmlrow=[]
colspan=1
for cell in row:
if cell=='':
colspan=colspan+1
continue
else:
htmlrow.append(self.CELL%(colspan,cell))
colspan=1
htmltable.append(self.ROW%join(htmlrow,''))
return self.TABLE%join(htmltable,'')
optional_trailing_punctuation = '\(,\|\([.:?;]\)\)?'
trailing_space = '\([\0- ]\)'
not_punctuation_or_whitespace = "[^-,.?:\0- ]"
table=Table()
class StructuredText:
"""Model text as structured collection of paragraphs.
Structure is implied by the indentation level.
This class is intended as a base classes that do actual text
output formatting.
"""
def __init__(self, aStructuredString, level=0,
paragraph_divider=regex.compile('\(\n *\)+\n'),
):
'''Convert a structured text string into a structured text object.
Aguments:
aStructuredString -- The string to be parsed.
level -- The level of top level headings to be created.
'''
aStructuredString = gsub(
'\"\([^\"\0]+\)\":' # title: <"text":>
+ ('\([-:a-zA-Z0-9_,./?=@#]+%s\)'
% not_punctuation_or_whitespace)
+ optional_trailing_punctuation
+ trailing_space,
'<a href="\\2">\\1</a>\\4\\5\\6',
aStructuredString)
aStructuredString = gsub(
'\"\([^\"\0]+\)\",[\0- ]+' # title: <"text", >
+ ('\([a-zA-Z]*:[-:a-zA-Z0-9_,./?=@#]*%s\)'
% not_punctuation_or_whitespace)
+ optional_trailing_punctuation
+ trailing_space,
'<a href="\\2">\\1</a>\\4\\5\\6',
aStructuredString)
protoless = find(aStructuredString, '<a href=":')
if protoless != -1:
aStructuredString = gsub('<a href=":', '<a href="',
aStructuredString)
self.level=level
paragraphs=ts_regex.split(untabify(aStructuredString),
paragraph_divider)
paragraphs=map(indent_level,paragraphs)
self.structure=structure(paragraphs)
def __str__(self):
return str(self.structure)
ctag_prefix="\([\0- (]\|^\)"
ctag_suffix="\([\0- ,.:;!?)]\|$\)"
ctag_middle="[%s]\([^\0- %s][^%s]*[^\0- %s]\|[^%s]\)[%s]"
ctag_middl2="[%s][%s]\([^\0- %s][^%s]*[^\0- %s]\|[^%s]\)[%s][%s]"
def ctag(s,
em=regex.compile(
ctag_prefix+(ctag_middle % (("*",)*6) )+ctag_suffix),
strong=regex.compile(
ctag_prefix+(ctag_middl2 % (("*",)*8))+ctag_suffix),
under=regex.compile(
ctag_prefix+(ctag_middle % (("_",)*6) )+ctag_suffix),
code=regex.compile(
ctag_prefix+(ctag_middle % (("\'",)*6))+ctag_suffix),
):
if s is None: s=''
s=gsub(strong,'\\1<strong>\\2</strong>\\3',s)
s=gsub(under, '\\1<u>\\2</u>\\3',s)
s=gsub(code, '\\1<code>\\2</code>\\3',s)
s=gsub(em, '\\1<em>\\2</em>\\3',s)
return s
class HTML(StructuredText):
'''\
An HTML structured text formatter.
'''\
def __str__(self,
extra_dl=regex.compile("</dl>\n<dl>"),
extra_ul=regex.compile("</ul>\n<ul>"),
extra_ol=regex.compile("</ol>\n<ol>"),
):
'''\
Return an HTML string representation of the structured text data.
'''
s=self._str(self.structure,self.level)
s=gsub(extra_dl,'\n',s)
s=gsub(extra_ul,'\n',s)
s=gsub(extra_ol,'\n',s)
return s
def ul(self, before, p, after):
if p: p="<p>%s</p>" % strip(ctag(p))
return ('%s<ul><li>%s\n%s\n</ul>\n'
% (before,p,after))
def ol(self, before, p, after):
if p: p="<p>%s</p>" % strip(ctag(p))
return ('%s<ol><li>%s\n%s\n</ol>\n'
% (before,p,after))
def dl(self, before, t, d, after):
return ('%s<dl><dt>%s<dd><p>%s</p>\n%s\n</dl>\n'
% (before,ctag(t),ctag(d),after))
def head(self, before, t, level, d):
if level > 0 and level < 6:
return ('%s<h%d>%s</h%d>\n%s\n'
% (before,level,strip(ctag(t)),level,d))
t="<p><strong>%s</strong><p>" % strip(ctag(t))
return ('%s<dl><dt>%s\n<dd>%s\n</dl>\n'
% (before,t,d))
def normal(self,before,p,after):
return '%s<p>%s</p>\n%s\n' % (before,ctag(p),after)
def pre(self,structure,tagged=0):
if not structure: return ''
if tagged:
r=''
else:
r='<PRE>\n'
for s in structure:
r="%s%s\n\n%s" % (r,html_quote(s[0]),self.pre(s[1],1))
if not tagged: r=r+'</PRE>\n'
return r
def table(self,before,table,after):
return '%s<p>%s</p>\n%s\n' % (before,ctag(table),after)
def _str(self,structure,level,
# Static
bullet=ts_regex.compile('[ \t\n]*[o*-][ \t\n]+\([^\0]*\)'
).match_group,
example=ts_regex.compile('[\0- ]examples?:[\0- ]*$'
).search,
dl=ts_regex.compile('\([^\n]+\)[ \t]+--[ \t\n]+\([^\0]*\)'
).match_group,
nl=ts_regex.compile('\n').search,
ol=ts_regex.compile(
'[ \t]*\(\([0-9]+\|[a-zA-Z]+\)[.)]\)+[ \t\n]+\([^\0]*\|$\)'
).match_group,
olp=ts_regex.compile('[ \t]*([0-9]+)[ \t\n]+\([^\0]*\|$\)'
).match_group
):
r=''
for s in structure:
ts_results = bullet(s[0], (1,))
if ts_results:
p = ts_results[1]
if s[0][-2:]=='::' and s[1]: ps=self.pre(s[1])
else:ps=self._str(s[1],level)
r=self.ul(r,p,ps)
continue
ts_results = ol(s[0], (3,))
if ts_results:
p = ts_results[1]
if s[0][-2:]=='::' and s[1]: ps=self.pre(s[1])
else: ps=self._str(s[1],level)
r=self.ol(r,p,ps)
continue
ts_results = olp(s[0], (1,))
if ts_results:
p = ts_results[1]
if s[0][-2:]=='::' and s[1]: ps=self.pre(s[1])
else: ps=self._str(s[1],level)
r=self.ol(r,p,ps)
continue
ts_results = dl(s[0], (1,2))
if ts_results:
t,d = ts_results[1]
r=self.dl(r,t,d,self._str(s[1],level))
continue
if example(s[0]) >= 0 and s[1]:
# Introduce an example, using pre tags:
r=self.normal(r,s[0],self.pre(s[1]))
continue
if s[0][-2:]=='::' and s[1]:
# Introduce an example, using pre tags:
r=self.normal(r,s[0][:-1],self.pre(s[1]))
if table.create(s[0]):
## table support.
r=self.table(r,table.html(),self._str(s[1],level))
continue
else:
if nl(s[0]) < 0 and s[1] and s[0][-1:] != ':':
# Treat as a heading
t=s[0]
r=self.head(r,t,level,
self._str(s[1],level and level+1))
else:
r=self.normal(r,s[0],self._str(s[1],level))
return r
def html_quote(v,
character_entities=(
(regex.compile('&'), '&'),
(regex.compile("<"), '<' ),
(regex.compile(">"), '>' ),
(regex.compile('"'), '"')
)): #"
text=str(v)
for re,name in character_entities:
text=gsub(re,name,text)
return text
def html_with_references(text, level=1):
text = gsub(
'[\0\n].. \[\([-_0-9_a-zA-Z-]+\)\]',
'\n <a name="\\1">[\\1]</a>',
text)
text = gsub(
'\([\0- ,]\)\[\([0-9_a-zA-Z-]+\)\]\([\0- ,.:]\)',
'\\1<a href="#\\2">[\\2]</a>\\3',
text)
text = gsub(
'\([\0- ,]\)\[\([^]]+\)\.html\]\([\0- ,.:]\)',
'\\1<a href="\\2.html">[\\2]</a>\\3',
text)
return HTML(text,level=level)
def main():
import sys, getopt
opts,args=getopt.getopt(sys.argv[1:],'tw')
if args:
[infile]=args
s=open(infile,'r').read()
else:
s=sys.stdin.read()
if opts:
if filter(lambda o: o[0]=='-w', opts):
print 'Content-Type: text/html\n'
if s[:2]=='#!':
s=ts_regex.sub('^#![^\n]+','',s)
r=ts_regex.compile('\([\0-\n]*\n\)')
ts_results = r.match_group(s, (1,))
if ts_results:
s=s[len(ts_results[1]):]
s=str(html_with_references(s))
if s[:4]=='<h1>':
t=s[4:find(s,'</h1>')]
s='''<html><head><title>%s</title>
</head><body>
%s
</body></html>
''' % (t,s)
print s
else:
print html_with_references(s)
if __name__=="__main__": main()
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