Use PLY to parse dice strings
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kad
parent
1bc0dd0b2a
commit
4f56e40ca7
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@ -22,6 +22,9 @@ from extlib import irclib
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from Module import Module
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import diceply
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import ply.yacc as yacc
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# Rolls dice, for RPGs mostly
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class Dice(Module):
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@ -30,69 +33,9 @@ class Dice(Module):
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whats = what.split(' ')
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if whats[0] == 'roll':
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rollitrs = re.split(';\s*', ' '.join(whats[1:]))
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reply = ""
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for count, roll in enumerate(rollitrs):
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pattern = '^(?:(\d+)#)?(?:(\d+)/)?(\d+)?d(\d+)(?:(\+|\-)(\d+))?(?:\s+(.*))?'
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regex = re.compile(pattern)
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matches = regex.search(roll)
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if matches is not None:
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# set variables including defaults for unspecified stuff
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faces = int(matches.group(4))
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comment = matches.group(7)
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if matches.group(1) is None:
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times = 1
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else:
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times = int(matches.group(1))
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if matches.group(3) is None:
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dice = 1
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else:
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dice = int(matches.group(3))
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if matches.group(2) is None:
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top = dice
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else:
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top = int(matches.group(2))
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if matches.group(5) is None or matches.group(6) is None:
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modifier = 0
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else:
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if str(matches.group(5)) == '-':
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modifier = -1 * int(matches.group(6))
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else:
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modifier = int(matches.group(6))
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result = roll + ': '
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for t in range(times):
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ressubstr = ""
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rolls = []
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for d in range(dice):
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rolls.append(str(random.randint(1, faces)))
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rolls.sort()
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rolls.reverse()
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ressubstr = ','.join(rolls[0:top])
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sum = 0
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for r in rolls[0:top]:
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sum += int(r)
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sumplus = sum + modifier
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result += str(sumplus) + ' [' + ressubstr
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if modifier != 0:
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if modifier > 0:
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result += ' + ' + str(modifier)
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else:
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result += ' - ' + str(-1 * modifier)
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result += ']'
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if t != times-1:
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result += ', '
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reply += result
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if count is not len(rollitrs)-1:
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reply += "; "
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dicestr = ' '.join(whats[1:])
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yacc.parse(dicestr)
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reply = diceply.get_result()
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if reply is not "":
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return self.reply(connection, replypath, nick + ': ' + reply)
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if whats[0] == 'ctech':
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@ -0,0 +1,246 @@
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# diceply.py
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# Dice string grammar using PLY
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# After initial run, parser.out should have the full grammar and the states
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# and any shift/reduce or reduce/reduce conflicts.
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#
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# The current state of the grammar has some shift/reduce conflicts, because
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# I don't know LR parsers well enough to prevent them. Also, currently spaces
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# in the roll string aren't working if we want comments (for now)
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#
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# This script can be run standalone if you enable the tests at the bottom
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import sys
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import random
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tokens = ['NUMBER', 'TEXT']
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literals = ['#', '/', '+', '-', 'd', ';']
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t_TEXT = r'\s+[^;]+'
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def t_NUMBER(t):
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r'\d+'
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t.value = int(t.value)
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return t
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def t_error(t):
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t.lexer.skip(1)
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import ply.lex as lex
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lex.lex()
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precedence = (
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('left', ';'),
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('left', '+', '-'),
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('right', 'd'),
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('left', '#'),
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('left', '/')
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)
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output = ""
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# Takes the parsed dice string for a single roll (eg 3/4d20) and performs
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# the actual roll. Returns a string representing the result
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def roll_dice(keep, dice, size):
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a = range(dice)
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for i in range(dice):
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a[i] = random.randint(1, size)
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if keep != dice:
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b = sorted(a, reverse=True)
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b = b[0:keep]
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else:
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b = a
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total = sum(b)
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outstr = "[";
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if len(b) != len(a):
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# Bold is \002
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outstr += ",".join(str(i) for i in b) + ","
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temp = sorted(a, reverse=True)
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temp = temp[keep:]
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bstr = ",".join(str(i) for i in temp)
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outstr += bstr
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else:
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outstr += ",".join(str(i) for i in a)
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outstr += "]"
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return (total, outstr)
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# Processes rolls coming from the parser. This generates the inputs
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# for the roll_dice() command, and returns the full string representing
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# the whole current dice string (the part up to a semicolon or end of line)
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def process_roll(trials, mods, comment):
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output = ""
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mode = 1
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repeat = 1
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if trials != None:
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repeat = trials
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for i in range(repeat):
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total = 0
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curr_str = ""
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if i > 0:
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output += ", "
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for m in mods:
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keep = 0
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dice = 1
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res = 0
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# if m is a tuple, then it is a die roll
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# m[0] = (keep, num dice)
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# m[1] = num faces on the die
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if type(m) == tuple:
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if m[0] != None:
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if m[0][0] != None:
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keep = m[0][0]
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dice = m[0][1]
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size = m[1]
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if keep > dice or keep == 0:
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keep = dice
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res = roll_dice(keep, dice, size)
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curr_str += "%d%s" % (res[0], res[1])
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res = res[0]
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elif m == "+":
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mode = 1
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curr_str += "+"
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elif m == "-":
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mode = -1
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curr_str += "-"
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else:
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res = m
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curr_str += str(m)
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total += mode * res
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output += "%d (%s)" % (total, curr_str)
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if comment != None:
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output = "%s: %s" % (comment.strip(), output)
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return output
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# General idea I had when creating this grammar: A roll string is a chain
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# of modifiers, which may be repeated for a certain number of trials. It can
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# have a comment that describes the roll
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# Multiple roll strings can be chained with semicolon
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def p_roll_r(p):
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'roll : roll ";" roll'
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global output
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p[0] = p[1] + "; " + p[3]
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output = p[0]
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# The basic roll string
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def p_roll(p):
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'roll : trial modifier comment'
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global output
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mods = []
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if type(p[2]) == list:
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mods = p[2]
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else:
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mods = [p[2]]
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p[0] = process_roll(p[1], mods, p[3])
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output = p[0]
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# Trial is optional so have a rule without it
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def p_roll_no_trials(p):
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'roll : modifier comment'
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global output
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mods = []
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if type(p[1]) == list:
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mods = p[1]
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else:
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mods = [p[1]]
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p[0] = process_roll(None, mods, p[2])
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output = p[0]
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def p_comment(p):
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'''comment : TEXT
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|'''
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if len(p) == 2:
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p[0] = p[1]
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else:
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p[0] = None
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def p_modifier(p):
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'''modifier : modifier "+" modifier
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| modifier "-" modifier'''
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# Use append to prevent nested lists (makes dealing with this easier)
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if type(p[1]) == list:
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p[1].append(p[2])
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p[1].append(p[3])
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p[0] = p[1]
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elif type(p[3]) == list:
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p[3].insert(0, p[2])
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p[3].insert(0, p[1])
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p[0] = p[3]
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else:
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p[0] = [p[1], p[2], p[3]]
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# Return the left side before the "d", and the number of faces
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def p_die(p):
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'modifier : left NUMBER'
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p[0] = (p[1], p[2])
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def p_die_num(p):
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'modifier : NUMBER'
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p[0] = p[1]
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# left is the number of dice we are rolling, and how many we are keeping
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def p_left(p):
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'left : keep dice'
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if p[1] == None:
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p[0] = [None, p[2]]
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else:
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p[0] = [p[1], p[2]]
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def p_left1(p):
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'left : dice'
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p[0] = [None, p[1]]
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def p_left_e(p):
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'left :'
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p[0] = None
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def p_total(p):
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'trial : NUMBER "#"'
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if len(p) > 1:
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p[0] = p[1]
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else:
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p[0] = None
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def p_keep(p):
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'keep : NUMBER "/"'
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if p[1] != None:
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p[0] = p[1]
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else:
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p[0] = None
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def p_dice(p):
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'dice : NUMBER "d"'
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p[0] = p[1]
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def p_dice2(p):
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'dice : "d"'
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p[0] = 1
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# Provide the user with something (albeit not much) when the roll can't be parsed
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def p_error(p):
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print "Unable to parse roll"
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print yacc.token()
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global output
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output = "Unable to parse roll"
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def get_result():
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global output
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return output
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import ply.yacc as yacc
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yacc.yacc()
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# Testing stuff:
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# rolls = (
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# "5#3/4d20+1+2+d20;3/4d20;4d20",
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# "d20+10 attack;d8+6 damage",
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# "2#d20+10 twin strike!111;d10+9 damage",
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# "d20+d20;d20+d20;d20+d20+d20",
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# "error"
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# )
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# for roll in rolls:
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# print "***** trying roll " + roll
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# yacc.parse(roll, debug=0)
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# print output
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