将 kjd.sgf (围棋定式)转换为 sql 语句的 python 源码

附件里是将 kjd.sgf (围棋定式)转换为 sql 语句的 python 源码，以及 sgf 源文件及生成的 sql 源文件。改自 eidogo.com。

今天玩 python 的体会：1、因为用到 simplejson，我用的是 python 2.66 的版本。太低了(2.1.7)好象不行。2、python 里不能用 tab 符号？3、python 确实很强大。

#import MySQLdb as mysql
import simplejson

class SgfNode:
    def __init__(self, id, parent):
        self.id = id
        self.properties = {}
        self.parent = parent
        self.children = []
        # DB prep fields
        self.depth = 0
        self.lt = 0
        self.rt = 0
        pass

class SgfParser:
    def __init__(self, sgf):
        self.sgf = sgf
        self.pos = 0
        self.root = SgfNode(0, None)
        self.nodecounter = 1
        self.parse_tree(self.root)
    
    def parse_tree(self, r):
        while (self.pos < len(self.sgf)):
            c = self.sgf[self.pos]
            self.pos += 1
            if c == ';':
                r = self.parse_node(r)
            elif c == '(':
                self.parse_tree(r)
            elif c == ')':
                return

    def parse_node(self, parent):
        node = SgfNode(self.nodecounter, parent)
        self.nodecounter += 1
        node = self.parse_properties(node)
        cur = node
        depth = 0
        while 1:
            cur = cur.parent
            if not cur:
                break
            depth += 1
        node.depth = depth
        parent.children.append(node)
        return node

    def parse_properties(self, node):
        prop = ''
        vals = []
        i = 0
        while (self.pos < len(self.sgf)):
            c = self.curc()
            if c == ';' or c == '(' or c == ')':
                break
            if self.curc() == '[':
                while self.curc() == '[':
                    self.pos += 1
                    vals.insert(i, '')
                    while self.curc() != ']' and self.pos < len(self.sgf):
                        if self.curc() == '\\':
                            self.pos += 1
                            while self.curc() == '\r' or self.curc() == '\n':
                                self.pos +=1
                        vals[i] += self.curc()
                        self.pos += 1
                    i += 1
                    while self.curc() == ']' or self.curc() == '\r' or self.curc() == '\n':
                        self.pos += 1
                if node.properties.has_key(prop):
                    if not (type(node.properties[prop]) is list):
                        node.properties[prop] = [node.properties[prop]]
                    node.properties[prop].extend(vals)
                else:
                    if (len(vals) > 1):
                        node.properties[prop] = vals
                    else:
                        node.properties[prop] = vals[0]
                prop = ''
                vals = []
                i = 0
                continue    
            if c != ' ' and c != '\n' and c != '\r' and c != '\t':
                prop += c
            self.pos += 1
        return node
        
    def curc(self):
        return self.sgf[self.pos]

def compute_ltrt(node, lt):
    rt = lt + 1
    for child in node.children:
        rt = compute_ltrt(child, rt)
    node.lt = lt
    node.rt = rt    
    return rt + 1

def db_populate(n, c):
    if n.parent:
        parent_id = n.parent.id
    else:
        parent_id = 0
    c.write( "insert into kjd (id, parent, properties, lt, rt, depth) values(" )
    c.write(str(n.id) + "," + str(parent_id) + ",'" + str(simplejson.dumps(n.properties))
#   c.write(str(n.id) + "," + str(parent_id) + ",'" + str(n.properties)
				+ "'," + str(n.lt) + "," + str(n.rt) + "," + str(n.depth) + ")\r\n")
    print n.id
    for child in n.children:
        db_populate(child, c)
        
def file_print(data, c):
    c.write(data)
    c.write('\r\n')
    
#if __name__ == "__main__":
#    file = open("../sgf/kjd.sgf")
file = open("kjd.sgf")
sgf = file.read()
file.close()
root = SgfParser(sgf).root
compute_ltrt(root, 1)
#    db = mysql.connect(host="localhost", user="", passwd="", db="eidogo")
#    c = db.cursor()
#    db_populate(root, c)
#    c.execute("update kjd set parent=null where id=0")
c = open("kjd.sql", "w")
db_populate(root, c)
#    c.write( "insert into kjd (id, parent, properties, lt, rt, depth) values(" )
c.write("update kjd set parent=null where id=0\r\n")
# file_print( "insert into kjd (id, parent, properties, lt, rt, depth) values(", c )
# file_print( "update kjd set parent=null where id=0", c )
c.close()