中文测试

中文测试标题

该帖子纯粹为了测试中文，如果成功，将在博客上显示正确地中文～～

Test

This is a test blog post

If this appears on my Blogspot, then my python script for posting blogs is successful. The following is a test for Pygments code highlighting.

for a in [5, 4, 3, 2, 1]:
    print a

流程图生成器(2)

最近用pyparsing写好了流程图定义的模块：

#!/usr/bin/env python
# -*- coding: utf-8 -*-

# flow_parser.py
# author: Rongzhou Shen
# date: 2009-02-11

from pyparsing import *

LSQUARE, RSQUARE, SEMI, ASSIGN, QUOTE = map(Suppress, '[];="')
LBRACE, RBRACE, AT, LBRACK, RBRACK = map(Suppress, '{}@()')

# Definition part of the flow_def file
node_id = Word(alphanums + "_")("id")
node_type = Word(alphas)("type")
declaration = node_type + LSQUARE + node_id + RSQUARE
value = QuotedString('"')
definition = Group(declaration("declaration") + ASSIGN + value("value") + SEMI)

# Flow part of the flow_def file
flow = Group(node_id + OneOrMore(Group('=>' + node_id)) + SEMI)

# Grammar definition of the whole file
flow_impl = OneOrMore(definition)("definitions") + OneOrMore(flow)("flows")
flow_def = AT + LBRACK + QuotedString('"')("flow_name") + RBRACK + LBRACE +\
        flow_impl("flow_impl") + RBRACE

#sample = """
#@("A test flow_chart") {
#    process[node1] = "This is a test process";
#    process[node2] = "This is another test process";
#    a => b => c;
#    ffew => fweji;
#}"""

def test_parse():
    expected = ['process', '[', 'node1', ']', '=', '"',
            'This is a test process', '"', ';']
    test_def = 'process[node1] = "This is a test process";'
    data = definition.parseString(test_def)
    assert len(data) == len(expected)
    assert all([x == y for x, y in zip(expected, data)])

    expected = ['a', '=>', 'b', '=>', 'c', ';']
    test_flow = 'a => b => c;'
    data = flow.parseString(test_flow)
    assert len(data) == len(expected)
    assert all([x == y for x, y in zip(expected, data)])

流程图生成器

一直想写一个来着，趁着这次在python.ubuntu.org.cn写［常用库系列］的机会写了这个。目前还不太完善，不过会慢慢改进。接下来要做的就是用pyparsing来完善和扩展我的流程图定义文件。

#!/usr/bin/env python
# -*- coding: utf-8 -*-

from __future__ import with_statement
import yapgvb
import optparse

FORMATS = {"png" : yapgvb.formats.png,
        "jpg" : yapgvb.formats.jpg,
        "gif" : yapgvb.formats.gif}
ENGINES = {"dot" : yapgvb.engines.dot,
        "neato" : yapgvb.engines.neato,
        "circo" : yapgvb.engines.circo,
        "twopi" : yapgvb.engines.twopi}

if __name__ == '__main__':
#    args = sys.argv
#    if len(args) < 2:
#        print "Usage: python state_machine.py <def file>"
#        sys.exit(0)

    parser = optparse.OptionParser()
    parser.add_option("-f", "--format", dest="format",
            help="store the flow chart in FORMAT",
            metavar="FORMAT", default="png")
    parser.add_option("-o", "--output", dest="output",
            help="save the flow chart to FILE",
            metavar="FILE")
    parser.add_option("-e", "--engine", dest="engine",
            help="the layout ENGINE to use for the flow chart",
            metavar="ENGINE", default="dot")

    options, args = parser.parse_args()
    if len(args) < 1:
        parser.print_usage()
        sys.exit(0)

    graph = yapgvb.Graph("States")
    node_dict = {}

    with open(args[0]) as def_file:
        lines = [l.strip() for l in def_file.readlines()]
        for line in lines:
            nodes = line.split("=>")
            prev_node = None
            for node in nodes[::-1]:
                label = node.strip().split("#")
                if not node_dict.has_key(label[0]):
                    node_in_graph = graph.add_node(label=label[1],
                            shape='ellipse', fillcolor='yellow',
                            style='filled', width=0.5)
                    node_dict[label[0]] = node_in_graph
                else:
                    node_in_graph = node_dict[label[0]]

                if prev_node:
                    edge = node_in_graph - prev_node
                    edge.arrowhead = 'normal'

                prev_node = node_in_graph

    graph.layout(ENGINES[options.engine])
    format = FORMATS[options.format]
    if options.output:
        out_file = options.output
    else:
        out_file = args[0] + "." + format

    graph.render(out_file, format)