from http.server import BaseHTTPRequestHandler, HTTPServer
import sys
+import os
hostName = "localhost"
serverPort = 8082
def apply_booking_to_account_balances(account_sums, account, currency, amount):
if not account in account_sums:
- account_sums[account] = {currency: amount}
+ account_sums[account] = {currency: amount}
elif not currency in account_sums[account].keys():
account_sums[account][currency] = amount
else:
account_sums[account][currency] += amount
+def parse_lines(lines):
+ import datetime
+ import decimal
+ inside_booking = False
+ date_string, description = None, None
+ booking_lines = []
+ start_line = 0
+ bookings = []
+ comments = []
+ for i, line in enumerate(lines):
+ prefix = f"line {i}"
+ # we start with the case of an utterly empty line
+ comments += [""]
+ stripped_line = line.rstrip()
+ if stripped_line == '':
+ if inside_booking:
+ # assume we finished a booking, finalize, and commit to DB
+ if len(booking_lines) < 2:
+ raise HandledException(f"{prefix} booking ends to early")
+ booking = Booking(date_string, description, booking_lines, start_line)
+ bookings += [booking]
+ # expect new booking to follow so re-zeroall booking data
+ inside_booking = False
+ date_string, description = None, None
+ booking_lines = []
+ continue
+ # if non-empty line, first get comment if any, and commit to DB
+ split_by_comment = stripped_line.split(sep=";", maxsplit=1)
+ if len(split_by_comment) == 2:
+ comments[i] = split_by_comment[1]
+ # if pre-comment empty: if inside_booking, this must be a comment-only line so we keep it for later ledger-output to capture those comments; otherwise, no more to process for this line
+ non_comment = split_by_comment[0].rstrip()
+ if non_comment.rstrip() == '':
+ if inside_booking:
+ booking_lines += ['']
+ continue
+ # if we're starting a booking, parse by first-line pattern
+ if not inside_booking:
+ start_line = i
+ toks = non_comment.split(maxsplit=1)
+ date_string = toks[0]
+ try:
+ datetime.datetime.strptime(date_string, '%Y-%m-%d')
+ except ValueError:
+ raise HandledException(f"{prefix} bad date string: {date_string}")
+ try:
+ description = toks[1]
+ except IndexError:
+ raise HandledException(f"{prefix} bad description: {description}")
+ inside_booking = True
+ continue
+ # otherwise, read as transfer data
+ toks = non_comment.split() # ignore specification's allowance of single spaces in names
+ if len(toks) > 3:
+ raise HandledException(f"{prefix} too many booking line tokens: {toks}")
+ amount, currency = None, None
+ account_name = toks[0]
+ if account_name[0] == '[' and account_name[-1] == ']':
+ # ignore specification's differentiation of "virtual" accounts
+ account_name = account_name[1:-1]
+ decimal_chars = ".-0123456789"
+ if len(toks) == 3:
+ i_currency = 1
+ try:
+ amount = decimal.Decimal(toks[1])
+ i_currency = 2
+ except decimal.InvalidOperation:
+ try:
+ amount = decimal.Decimal(toks[2])
+ except decimal.InvalidOperation:
+ raise HandledException(f"{prefix} no decimal number in: {toks[1:]}")
+ currency = toks[i_currency]
+ if currency[0] in decimal_chars:
+ raise HandledException(f"{prefix} currency starts with int, dot, or minus: {currency}")
+ elif len(toks) == 2:
+ value = toks[1]
+ inside_amount = False
+ inside_currency = False
+ amount_string = ""
+ currency = ""
+ dots_counted = 0
+ for i, c in enumerate(value):
+ if i == 0:
+ if c in decimal_chars:
+ inside_amount = True
+ else:
+ inside_currency = True
+ if inside_currency:
+ if c in decimal_chars and len(amount_string) == 0:
+ inside_currency = False
+ inside_amount = True
+ else:
+ currency += c
+ continue
+ if inside_amount:
+ if c not in decimal_chars:
+ if len(currency) > 0:
+ raise HandledException(f"{prefix} amount has non-decimal chars: {value}")
+ inside_currency = True
+ inside_amount = False
+ currency += c
+ continue
+ if c == '-' and len(amount_string) > 1:
+ raise HandledException(f"{prefix} amount has non-start '-': {value}")
+ if c == '.':
+ if dots_counted > 1:
+ raise HandledException(f"{prefix} amount has multiple dots: {value}")
+ dots_counted += 1
+ amount_string += c
+ if len(amount_string) == 0:
+ raise HandledException(f"{prefix} amount missing: {value}")
+ if len(currency) == 0:
+ raise HandledException(f"{prefix} currency missing: {value}")
+ amount = decimal.Decimal(amount_string)
+ booking_lines += [(account_name, amount, currency)]
+ if inside_booking:
+ raise HandledException(f"{prefix} last booking unfinished")
+ return bookings, comments
+
class Booking:
def __init__(self, date_string, description, booking_lines, start_line):
self.date_string = date_string
- self.description = description
- self.lines = booking_lines
+ self.description = description
+ self.lines = booking_lines
self.start_line = start_line
self.validate_booking_lines()
self.account_changes = self.parse_booking_lines_to_account_changes()
sums = {}
empty_values = 0
for line in self.lines:
- if line == '':
+ if line == '':
continue
_, amount, currency = line
if amount is None:
sinkable = False
for k, v in sums.items():
if v != 0:
- sinkable = True
+ sinkable = True
if not sinkable:
raise HandledException(f"{prefix} has empty value that cannot be filled")
debt = {}
sink_account = None
for line in self.lines:
- if line == '':
+ if line == '':
continue
account, amount, currency = line
if amount is None:
class Database:
def __init__(self, load_from_file=True):
- import os
db_name = "_ledger"
self.db_file = db_name + ".json"
self.lock_file = db_name+ ".lock"
self.comments = []
if load_from_file and os.path.exists(self.db_file):
with open(self.db_file, "r") as f:
- self.parse_lines(f.readlines())
+ ret = parse_lines(f.readlines())
+ self.bookings += ret[0]
+ self.comments += ret[1]
- def parse_lines(self, lines):
- import datetime
- import decimal
- inside_booking = False
- date_string, description = None, None
- booking_lines = []
- start_line = 0
- for i, line in enumerate(lines):
- prefix = f"line {i}"
- # we start with the case of an utterly empty line
- self.comments += [""]
- stripped_line = line.rstrip()
- if stripped_line == '':
- if inside_booking:
- # assume we finished a booking, finalize, and commit to DB
- if len(booking_lines) < 2:
- raise HandledException(f"{prefix} booking ends to early")
- booking = Booking(date_string, description, booking_lines, start_line)
- self.bookings += [booking]
- # expect new booking to follow so re-zeroall booking data
- inside_booking = False
- date_string, description = None, None
- booking_lines = []
- continue
- # if non-empty line, first get comment if any, and commit to DB
- split_by_comment = stripped_line.split(sep=";", maxsplit=1)
- if len(split_by_comment) == 2:
- self.comments[i] = split_by_comment[1]
- # if pre-comment empty: if inside_booking, this must be a comment-only line so we keep it for later ledger-output to capture those comments; otherwise, no more to process for this line
- non_comment = split_by_comment[0].rstrip()
- if non_comment.rstrip() == '':
- if inside_booking:
- booking_lines += ['']
- continue
- # if we're starting a booking, parse by first-line pattern
- if not inside_booking:
- start_line = i
- toks = non_comment.split(maxsplit=1)
- date_string = toks[0]
- try:
- datetime.datetime.strptime(date_string, '%Y-%m-%d')
- except ValueError:
- raise HandledException(f"{prefix} bad date string: {date_string}")
- try:
- description = toks[1]
- except IndexError:
- raise HandledException(f"{prefix} bad description: {description}")
- inside_booking = True
- continue
- # otherwise, read as transfer data
- toks = non_comment.split() # ignore specification's allowance of single spaces in names
- if len(toks) > 3:
- raise HandledException(f"{prefix} too many booking line tokens: {toks}")
- amount, currency = None, None
- account_name = toks[0]
- if account_name[0] == '[' and account_name[-1] == ']':
- # ignore specification's differentiation of "virtual" accounts
- account_name = account_name[1:-1]
- decimal_chars = ".-0123456789"
- if len(toks) == 3:
- i_currency = 1
- try:
- amount = decimal.Decimal(toks[1])
- i_currency = 2
- except decimal.InvalidOperation:
- try:
- amount = decimal.Decimal(toks[2])
- except decimal.InvalidOperation:
- raise HandledException(f"{prefix} no decimal number in: {toks[1:]}")
- currency = toks[i_currency]
- if currency[0] in decimal_chars:
- raise HandledException(f"{prefix} currency starts with int, dot, or minus: {currency}")
- elif len(toks) == 2:
- value = toks[1]
- inside_amount = False
- inside_currency = False
- amount_string = ""
- currency = ""
- dots_counted = 0
- for i, c in enumerate(value):
- if i == 0:
- if c in decimal_chars:
- inside_amount = True
- else:
- inside_currency = True
- if inside_currency:
- if c in decimal_chars and len(amount_string) == 0:
- inside_currency = False
- inside_amount = True
- else:
- currency += c
- continue
- if inside_amount:
- if c not in decimal_chars:
- if len(currency) > 0:
- raise HandledException(f"{prefix} amount has non-decimal chars: {value}")
- inside_currency = True
- inside_amount = False
- currency += c
- continue
- if c == '-' and len(amount_string) > 1:
- raise HandledException(f"{prefix} amount has non-start '-': {value}")
- if c == '.':
- if dots_counted > 1:
- raise HandledException(f"{prefix} amount has multiple dots: {value}")
- dots_counted += 1
- amount_string += c
- if len(amount_string) == 0:
- raise HandledException(f"{prefix} amount missing: {value}")
- if len(currency) == 0:
- raise HandledException(f"{prefix} currency missing: {value}")
- amount = decimal.Decimal(amount_string)
- booking_lines += [(account_name, amount, currency)]
+ def append(self, lines):
+ import shutil
+ if os.path.exists(self.lock_file):
+ raise HandledException('Sorry, lock file!')
+ if os.path.exists(self.db_file):
+ shutil.copy(self.db_file, self.db_file + ".bak")
+ f = open(self.lock_file, 'w+')
+ f.close()
+ with open(self.db_file, 'a') as f:
+ f.write('\n' + '\n'.join(lines) + '\n');
+ os.remove(self.lock_file)
- def ledger_as_html(self):
- lines = []
- for comment in self.comments:
- lines += [f"; {comment}" if comment != '' else '']
- for booking in self.bookings:
- i = booking.start_line
- suffix = f" {lines[i]}" if len(lines[i]) > 0 else ""
- lines[i] = f"{booking.date_string} {booking.description}{suffix}"
- for booking_line in booking.lines:
- i += 1
- if booking_line == '':
- continue
- suffix = f" {lines[i]}" if len(lines[i]) > 0 else ""
- value = f" {booking_line[1]} {booking_line[2]}" if booking_line[1] else ""
- lines[i] = f"{booking_line[0]}{value}{suffix}"
- content = "\n".join(lines)
- return f"<html><meta charset=\"UTF-8\"><pre>{content}</pre></html>"
- def balance_as_html(self):
+class MyServer(BaseHTTPRequestHandler):
+ header = '<html><meta charset="UTF-8"><body><a href="/ledger">ledger</a> <a href="/balance">balance</a> <a href="/add">add</a><hr />'
+ footer = '</body><html>'
+
+ def do_POST(self):
+ from urllib.parse import parse_qs
+ length = int(self.headers['content-length'])
+ postvars = parse_qs(self.rfile.read(length).decode(), keep_blank_values=1)
+ lines = postvars['booking'][0].splitlines()
+ try:
+ bookings, comments = parse_lines(lines)
+ db.append(lines)
+ self.send_response(200)
+ self.end_headers()
+ page = f"{self.header}Success!{self.footer}"
+ self.wfile.write(bytes(page, "utf-8"))
+ except HandledException as e:
+ self.send_response(400)
+ self.end_headers()
+ page = f"{self.header}{e}{self.footer}"
+ self.wfile.write(bytes(page, "utf-8"))
+
+ def do_GET(self):
+ self.send_response(200)
+ self.send_header("Content-type", "text/html")
+ self.end_headers()
+ db = Database()
+ page = self.header + ''
+ if self.path == '/balance':
+ page += self.balance_as_html(db)
+ elif self.path == '/add':
+ page += self.add()
+ else:
+ page += self.ledger_as_html(db)
+ page += self.footer
+ self.wfile.write(bytes(page, "utf-8"))
+
+ def balance_as_html(self, db):
account_sums = {}
- for booking in self.bookings:
+ for booking in db.bookings:
for account, changes in booking.account_changes.items():
for currency, amount in changes.items():
apply_booking_to_account_balances(account_sums, account, currency, amount)
account_tree = {}
def collect_branches(account_name, path):
- node = account_tree
+ node = account_tree
path_copy = path[:]
while len(path_copy) > 0:
step = path_copy.pop(0)
- node = node[step]
+ node = node[step]
toks = account_name.split(":", maxsplit=1)
parent = toks[0]
if parent in node.keys():
child = node[parent]
else:
child = {}
- node[parent] = child
+ node[parent] = child
if len(toks) == 2:
k, v = collect_branches(toks[1], path + [parent])
if k not in child.keys():
child[k] = v
else:
child[k].update(v)
- return parent, child
+ return parent, child
for account_name in sorted(account_sums.keys()):
k, v = collect_branches(account_name, [])
if k not in account_tree.keys():
for k, v in tree_node.items():
child_path = parent_path + ":" + k
for currency, amount in collect_totals(child_path, v).items():
- apply_booking_to_account_balances(account_sums, parent_path, currency, amount)
+ apply_booking_to_account_balances(account_sums, parent_path, currency, amount)
return account_sums[parent_path]
for account_name in account_tree.keys():
account_sums[account_name] = collect_totals(account_name, account_tree[account_name])
lines = []
def print_subtree(lines, indent, node, subtree, path):
- line = f"{indent}{node}"
+ line = f"{indent}{node}"
n_tabs = 5 - (len(line) // 8)
- line += n_tabs * "\t"
+ line += n_tabs * "\t"
if "€" in account_sums[path + node].keys():
amount = account_sums[path + node]["€"]
line += f"{amount:9.2f} €\t"
else:
line += f"\t\t"
- for currency, amount in account_sums[path + node].items():
+ for currency, amount in account_sums[path + node].items():
if currency != '€' and amount > 0:
line += f"{amount:5.2f} {currency}\t"
lines += [line]
for k, v in sorted(account_tree.items()):
print_subtree(lines, "", k, v, "")
content = "\n".join(lines)
- return f"<html><meta charset=\"UTF-8\"><pre>{content}</pre></html>"
-
+ return f"<pre>{content}</pre>"
-class MyServer(BaseHTTPRequestHandler):
+ def ledger_as_html(self, db):
+ lines = []
+ for comment in db.comments:
+ lines += [f"; {comment}" if comment != '' else '']
+ for booking in db.bookings:
+ i = booking.start_line
+ suffix = f" {lines[i]}" if len(lines[i]) > 0 else ""
+ lines[i] = f"{booking.date_string} {booking.description}{suffix}"
+ for booking_line in booking.lines:
+ i += 1
+ if booking_line == '':
+ continue
+ suffix = f" {lines[i]}" if len(lines[i]) > 0 else ""
+ value = f" {booking_line[1]} {booking_line[2]}" if booking_line[1] else ""
+ lines[i] = f"{booking_line[0]}{value}{suffix}"
+ content = "\n".join(lines)
+ return f"<pre>{content}</pre>"
- def do_GET(self):
- self.send_response(200)
- self.send_header("Content-type", "text/html")
- self.end_headers()
- db = Database()
- # page = db.ledger_as_html()
- page = db.balance_as_html()
- self.wfile.write(bytes(page, "utf-8"))
+ def add(self):
+ return '<form method="POST" action="/"><textarea name="booking" rows="8" cols="80"></textarea><input type="submit"></form>'
db = Database()
-if __name__ == "__main__":
+if __name__ == "__main__":
webServer = HTTPServer((hostName, serverPort), MyServer)
print(f"Server started http://{hostName}:{serverPort}")
try:
projects / misc / commitdiff