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path: root/stocks.py
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#!/usr/bin/python
# coding=utf-8
"""Handle stocks on the web."""
import cgi
import cgitb
cgitb.enable ()

from Cheetah.Template import Template
import fcntl

DEFAULT_DATABASE = 'stocks.txt'

class StocksError (Exception):
    pass

class StocksParseError (StocksError):

    def __init__ (self, message, filename, line_index):
        StocksError.__init__ (self, message, filename, line_index)
        self.filename = filename
        self.line = line_index + 1
        self.message = message

    def __str__ (self):
        return '%s:%d: %s' % (self.filename, self.line, self.message)

class StocksItemQty (dict):
    """Quantity dict of StocksItem."""

    def __setitem__ (self, key, value):
        if value:
            dict.__setitem__ (self, key, value)
        else:
            del self[key]

    def itersorted (self, withmain = False):
        for k in sorted (self.keys ()):
            if withmain or k != 'main':
                yield k, self[k]

class StocksItem:
    """A specific stock item."""

    def __init__ (self, code, cmd, qty, desc = None):
        self.code = code
        self.cmd = cmd
        self.qty = StocksItemQty (main = qty)
        self.desc = desc

    def __str__ (self):
        s = [ ]
        s.append ('%s\t%s\t%d' % (self.code, self.cmd, self.qty['main']))
        if self.desc:
            s.extend (('\t', self.desc))
        for place, qty in self.qty.itersorted ():
            s.append ('\n\t%s\t%d' % (place, qty))
        return ''.join (s)

class Stocks:
    """Stocks, i.e. stock items list."""

    def __init__ (self):
        self.database = None

    def __delete__ (self):
        self.close ()

    def load (self, filename):
        """Open an lock database."""
        # Open and lock.
        self.close ()
        self.database = open (filename, 'r+')
        fcntl.flock (self.database, fcntl.LOCK_EX)
        self.database.seek (0)
        # Load.
        self.head = [ ]
        self.tail = [ ]
        self.items = { }
        headtail = self.head
        last_item = None
        for n, line in enumerate (self.database):
            if '\t' not in line:
                headtail.append (line)
            elif line.startswith ('Code\t'):
                headtail.append (line)
                headtail = self.tail
            elif not line.startswith ('\t'):
                cols = line.strip ().split ('\t')
                if len (cols) not in (3, 4):
                    raise StocksParseError ("bad input line", filename, n)
                code, cmd, qty = cols[0:3]
                desc = cols[3] if len (cols) == 4 else None
                try:
                    qty = int (qty)
                except ValueError:
                    raise StocksParseError ("bad quantity", filename, n)
                if code in self.items:
                    raise StocksParseError ("duplicated code", filename, n)
                item = StocksItem (code, cmd, qty, desc)
                self.items[item.code] = item
                last_item = item
            else:
                cols = line.strip ().split ('\t')
                if len (cols) != 2 or last_item is None:
                    raise StocksParseError ("bad input line", filename, n)
                place, qty = cols
                try:
                    qty = int (qty)
                except ValueError:
                    raise StocksParseError ("bad quantity", filename, n)
                if place in last_item.qty:
                    raise StocksParseError ("duplicated place", filename, n)
                last_item.qty[place] = qty

    def dump (self):
        """Dump stocks to database."""
        self.database.seek (0)
        self.database.truncate ()
        self.database.write (''.join (self.head))
        for ik in sorted (self.items.keys ()):
            self.database.write (str (self.items[ik]) + '\n')
        self.database.write (''.join (self.tail))

    def close (self):
        """Close and unlock database."""
        if self.database is not None:
            self.database.close ()

    def itersorted (self):
        """Return sorted iterable list of items."""
        for ik in sorted (self.items.keys ()):
            yield self.items[ik]

class AppCGI:

    def __init__ (self):
        pass

    def run (self):
        self.error = None
        dirty = False
        # Get form content.
        form = cgi.FieldStorage ()
        self.mode = form.getfirst ('mode', None)
        self.place = form.getfirst ('place', None)
        code = form.getfirst ('code', None)
        try:
            qty = int (form.getfirst ('qty', 0))
        except ValueError:
            self.error = "bad quantity"
            qty = None
        # Read database.
        self.stocks = Stocks ()
        self.stocks.load (DEFAULT_DATABASE)
        # Make operations.
        if not self.error:
            if self.mode == 'command' and self.place and code and qty:
                i = self.stocks.items[code]
                old_qty = i.qty.get (self.place, 0)
                i.qty[self.place] = old_qty + qty
                dirty = True
        if dirty:
            self.stocks.dump ()
        # Done.
        self.output ()

    def output (self):
        t = Template (AppCGI.template, searchList = [ self ])
        t.stylesheet = AppCGI.stylesheet
        print t

AppCGI.stylesheet = """\
table {
    border-collapse: collapse;
    width: 100%;
}
th {
    background: #d0d0d0;
}
td {
    background: #e0e0e0;
    border: 1px solid white;
}
tr.place td {
    background: #e8e8e8;
}
tr:hover td, tr.place:hover td {
    background: #f0f0f0;
}
td.qty, td.action {
    text-align: right;
}
form {
    margin: 0;
}
input.qty {
    width: 5em;
}
"""

AppCGI.template = u"""\
Content-Type: text/html; charset=UTF-8

<html>
<head>
<title>Stocks</title>
<style type="text/css">
$stylesheet
</style>
</head>
<body>
<h1>Stocks</h1>

#def cmdlink($cmd)
  #if $cmd.isdigit()
    <a href="http://fr.farnell.com/$cmd">$cmd</a>
  #else
    #filter WebSafe
      $cmd
    #end filter
  #end if
#end def

#def command_mode($i)
  #if $mode == 'command'
    <td class="action"><form method="POST">
      <input type="hidden" name="code" value="$i.code" />
      #if $place in $i.qty then $i.qty[$place] else 0 #
      ±<input type="text" name="qty" class="qty" />
      <input type="submit" value="OK" />
    </form></td>
  #end if
#end def

#if not $mode
<form><p>
  Command mode
  <input type="hidden" name="mode" value="command" />
  <input type="text" name="place" />
  <input type="submit" value="OK" />
</p></form>
#else
<form><p><input type="submit" value="Leave $mode mode" /></p></form>
#end if

#filter WebSafe

<table>
  <tr>
    <th>Code</th>
    <th>Command</th>
    <th>Description</th>
    <th colspan="2">Qty</th>
    #if $mode
      <th>$place</th>
    #end if
  </tr>
  #for $i in $stocks.itersorted
    <tr>
      <td>$i.code</td>
      #filter None
      <td>$cmdlink($i.cmd)</td>
      #end filter
      <td>$i.desc</td>
      <td colspan="2" class="qty">$i.qty.main</td>
      #filter None
      $command_mode($i)
      #end filter
    </tr>
    #for $iplace, $qty in $i.qty.itersorted
      <tr class="place">
        <td colspan="3"></td>
        <td>$iplace</td>
        <td class="qty">$qty</td>
        #if $mode
        <td></td>
        #end if
      </tr>
    #end for
  #end for
</table>

#end filter

</body>
</html>
"""

if __name__ == '__main__':
    a = AppCGI ()
    a.run ()