annotate orpg/dieroller/dieroller.txt @ 100:7ed4979cc1cf beta

Traipse Beta 'OpenRPG' {090925-00} Traipse is a distribution of OpenRPG that is designed to be easy to setup and go. Traipse also makes it easy for developers to work on code without fear of sacrifice. 'Ornery-Orc' continues the trend of 'Grumpy' and adds fixes to the code. 'Ornery-Orc''s main goal is to offer more advanced features and enhance the productivity of the user. Update Summary: 090925-00: Adds menu changes to draw attention to important updates, errors, or other events. (image info coming soon) Traipse URL is not included in the repos tab and is set as default. Fixes Copy for Windows and Linux (finally!!) users. Fixes incomplete update to Grid and List nodes. Fixes incomplete update to Chat Commands. Fixes problems with Remote Image Upload. Fixes Drop and Drag of Minis to Map. CherryPy can now use any image in the webfiles/ folder and sub-folders. CherryPy can now Drop and Drag Minis to the Map. Minor changes to Update Manager's GUI. Expert recommendation warning added to Revision Update. Step down compatibility with open_rpg & component added to orpgCore. Fixes CherryPit misspelling. Makes Traipse Suite 'Attention' item portable, and executes it on 'Critical' debug notices. Adds incomplete Shift + Enter to Text Entry, currently creates a 'Critical' warning. New default Lobby Map, designed for Traipse. Feel free to change it. Updates to Server GUI: * Admin can Ban from Backend. * Admin can Modify Ban List and Un Ban users. * Server GUI finds your Lobby Name * New users default as Lurker unless a Role is set Cleaner TraipseSuiteAttention portability and clean up in Main. Die Roll Commands addition from Core code allowing Math Ordering with ()'s New About Dialog. A more uniform About Dialog. Corrects image loading of duplicate images.
author sirebral
date Fri, 25 Sep 2009 20:46:02 -0500
parents 4385a7d0efd1
children bf799efe7a8a
rev   line source
0
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1 The New Dicing System: A Proposal for OpenRPG
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2 ----------------------------------------------
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3
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4 The current dice system for OpenRPG has several limitations. Foremost
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5 among these are the fact that adding a new, non-standard dicing mechanism
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6 requires editing of the basic dice code. There are several secondary
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7 limitations, such as the fact that while the dice system can handle math,
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8 it cannot be used as a calculator -- it will not allow expressions that do
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9 not involve dice.
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10
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11 This proposal is for a new dicing system to replace the current one in
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12 OpenRPG. Since the dicing system is something that users will interact
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13 with frequently, a new system needs to be considered carefully. This
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14 document attempts to describe the new dicing system so that such
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15 consideration can be given to it. It is expected that this document will
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16 grow and change as it is scrutinized.
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17
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18
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19 Design goals for this dicing system:
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20
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21 1. Should be easy for new users to get started with, based on knowing
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22 standard RPG dice notation (NdX) and basic math.
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23
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24 2. Should, as far as practical, maintain compatibility with existing
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25 character sheets, etc., that use the current dice system.
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26
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27 3. Should allow users to create new dice types and new ways of
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28 counting dice. Ideally, this should not require programming, except
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29 in exceptional cases.
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30
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31 4. The dice system should be usable for doing basic math that does
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32 not involve dice.
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33
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34 5. The dice system should be able to handle most current RPG dicing
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35 systems.
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36
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37 Things this dicing system is designed to NOT do:
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38
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39 1. Be a programming language. There are no facilities in it for
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40 user input, output formatting, loops, if-then-else, or similar
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41 things. If these are desired for something involving dice, an
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42 appropriate node and nodehandler can be created.
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43
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44 2. Handle all theoretically possible dicing systems without the
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45 need for programming plugins. First off, this is impossible.
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46 Second, even making an attempt to would require supporting
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47 dicing methods that don't actually turn up in any real game.
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48
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49 3. Handle floating-point math. I don't know of any systems that
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50 use it in their dice schemes right now. If there are some,
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51 we might have to consider adding it.
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52
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53
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54 Syntax Specification
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55
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56 What follows is a BNF specification for the proposed dicing system, with
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57 explanatory text interleaved. At the end of this document is a copy of
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58 the BNF with no explanations, for those who would like to look at it "all
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59 together". Note that BNF describes only syntax, and not semantics; thus,
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60 while anything generated with this grammar should be syntactically correct,
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61 that doesn't mean it will make sense or be allowed.
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62
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63
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64 dice string ::= <expression>
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65 <expression> of <comparison> | <comparison>
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66
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67 This is the top level. The major thing of note here is that comparisons
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68 only occur at this level. This is intentional; the result of a comparison
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69 is a boolean true/false flag rather than a number. Thus, it makes no
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70 sense to allow people to perform further numerical operations on the
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71 result of a comparison. Systems where dice are triggered by the results
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72 of other dice are left for the realm of plugins.
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73
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74
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75 comparison ::= <expression> <relation> <expression>
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76
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77 expression ::= <factor> | <factor> <low-op> <factor>
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78
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79 The separation into "low-op" and "high-op" of the operators is to allow
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80 order of operations to be handled more easily. Syntactically, it's not
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81 really necessary, but it should be helpful in implementation.
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82
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83
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84 factor :: = <term> | <term> <high-op> <term> |
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85 <multi-dice> | <multi-dice> <high-op> <term> |
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86 <term> <high-op> <multi-dice>
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87
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88 Here we start to hit some complication. The intent of the different
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89 entries for multi-dice is that we don't want to allow things like
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90 [3d6 each * 2d6 each]. We are *not* doing vector multiplication!
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91 The "expression" level doesn't have any such limitation on syntax;
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92 things like [3d6 each + 2d6 each] we'll have to either think of a
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93 logical way to handle, or disallow on a semantic level. (Well... I
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94 suppose it could be handled in the BNF, but I think it would get
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95 kind of messy.)
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96
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97
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98 term ::= <dice> | <unit>
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99
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100 unit ::= <number> | ( <expression> )
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101
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102 Dice are not considered a unit. This means that things like [3d6d10] can't
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103 be done without using parentheses. I consider that to be a win for
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104 clarity.
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105
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106
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107 dice ::= <unit>d<unit> | <unit>d<name> | <dice> <flag> | lastroll
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108
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109 The <name> entry here allows for user-created dice (in the syntax, at
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110 least...).
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111
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112
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113 multi-dice ::= ( <dice>, <dice>+ ) | # (1d6,1d8)
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114 <dice> each | # 3d6 each
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115 ( <expression> of <expression> ) | # (3 of 2d6)
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116 lastroll | # lastroll
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117 <multi-dice> <flag> # (3 of 2d6) best 2
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118
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119 "lastroll" by itself can be either dice or multi-dice. I'm thinking that it
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120
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121 should be whatever type the last roll was.
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122
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123
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124 flag ::= reroll <condition> | # repeats
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125 reroll <slice> | # once only
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126 grow <condition> | # reroll and add
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127 shrink <condition> | # reroll and subtract
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128 drop <condition> |
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129 drop <slice> |
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130 take <condition> |
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131 take <slice> |
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132 <slice> | # implied "take"
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133 <name> <condition> | # user-created
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134 <name> # user-created
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135
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136 Technically, we don't need both "drop" and "take" -- one implies the
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137 other. However, having both should make the language easier to use.
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138
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139 "reroll" will work differently depending on whether a condition or a
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140 slice is given. If a condition is given, it will reroll until none of
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141 the dice in the set meet the reroll condition (or until it hits a maximum
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142 allowed number of rerolls). If a slice is given, it will reroll those
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143 dice once. IMHO, this behavior makes the most sense.
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144
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145 The <name> entries here are to allow for user-created flags. Note that
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146 as I've specified things right now, a user-created flag can have a
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147 condition,
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148 but not a slice. That's mostly because I couldn't think of a case where
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149 a slice would be useful... should we add it anyways?
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150
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151
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152 slice ::= highest | lowest | highest <number> | lowest <number>
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153
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154 "highest" and "lowest" without a number are equivalent to doing them with
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155 1 as the number. This is to simplify things like [4d6 drop lowest].
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156
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157
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158 condition ::= <relation> <unit>
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159
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160 This is for conditions on flags. Note that it can take a unit, so you could
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161
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162 use dice in a condition; however, I think the unit should only be evaluated
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163
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164 once, to make things faster. Anyone for repetitive evaluation?
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165
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166
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167 low-op ::= + | - | min | max
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168
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169 "min" takes two values and returns the highest of them, and "max"
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170 returns the lowest of them. This might seem counterintuitive, but
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171 it's meant to be used with dice, like so:
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172
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173 3d6 min 8 - always returns 8 or higher
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174
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175 3d6 max 15 - always returns 15 or lower
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176
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177 I decided to put min and max as having the same precedence as + and -,
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178 because if they had higher precedence, then:
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179
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180 3d6+2 min 10
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181
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182 would be equivalent to 3d6+10. (It would take the max of 2 and 10, then
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183 add that to 3d6). One problem that does arise here is with multiplication
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184 and division: [1d6 min 5 * 2] will be equivalent to [1d6 min 10], since
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185 multiplication has higher precedence. We may just want to warn people
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186 that min and max can be screwy unless you parenthesize, unless someone can
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187 think of a better way to handle them.
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188
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189
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190 high-op ::= * | / | mod
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191
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192 The / is integer division, of course, since we're doing integer math.
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193
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194
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195 number ::= <digit>+ | -<digit>+
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196
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197 Positive and negative numbers are allowed. This means that, syntactically,
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198 [-2d-4] is legal. Do we want to modify the BNF to disallow this, or handle
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199 it on a semantic level?
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200
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201
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202 name ::= <letter>[<letter>|<digit>]*
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203
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204 We may want to expand to allow underscores and dashes in user-created names.
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205
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206
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207
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208 letter ::= A-Z | a-z
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209
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210 digit ::= 0-9
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211
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212 relation ::= < | > | <= | >= | => | =< | = | ==
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213
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214
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215
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216 Well, that's the BNF. Again, at the end is a copy without all the running
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217 commentary.
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218
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219
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220 Thoughts on Implementation:
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221
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222 First, I think a sort of "dice library" of common functions needs to be
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223 created. This would include rolling a set of dice, getting the highest
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224 of a group of dice, growing and shrinking dice from a set based on
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225 conditions, and so on. These functions should be available for use by
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226 custom-written dice types.
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227
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228 Next, that library should be used as a tool in implementing a dice-string
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229 interpreter. That will require creating a parser for the dice-string
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230 'language'. This could be either a custom-written parser, or possibly
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231 one created with some of the Python parser generators. A custom-written
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232 parser may take longer to do and be a bit more finicky to maintain, but
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233 it would remove a dependency from the code.
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234
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235 User-created flags and dice types could be supported in two ways:
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236
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237 - First, by allowing users to specify strings in the dice language
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238 that the flags/expressions would expand to -- basically, allowing
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239 dice macros.
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240
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241 - Second, by adding hooks for python modules to be associated with
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242 user-created dice or flag types. This is likely to be the more
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243 complicated of the two solutions, but it would also be more
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244 flexible.
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245
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246 Personally, I think both are desirable -- the first, so that
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247 non-programming users can create simple die and flag types. The
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248 second, because by design, there are some things this dice system
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249 just won't do.
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250
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251
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252 Further work needed:
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253
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254 - specs for the "dice library"
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255
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256 - specs on an interface for python modules meant to be dice and
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257 flag types.
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258
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259 ----------------------------------------------------------------
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260
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261 start ::= <expression> |
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262 <comparison>
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263
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264 comparison ::= <expression> <condition>
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265
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266 expression ::= <term> | <term> <low-op> <factor>
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267
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268 term ::= <factor> | <factor> <high-op> <unit>
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269
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270 factor ::= <atom> | <dice_set>
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271
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272 atom ::= <number> | ( <expression> )
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273
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274 dice_set ::= <dice> <dice_set>, <dice> | <expr> of <dice> | <dice> each |
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275 lastroll
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276
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277 dice ::= <atom>d<atom> | <atom>d<name> | <dice> <flag>
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278
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279 flag ::= reroll <condition> |
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280 reroll <slice> |
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281 grow <condition> |
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282 shrink <condition> |
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283 drop <condition> |
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284 drop <slice> |
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285 take <condition> |
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286 take <slice> |
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287 <slice> |
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288 <name> <condition> |
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289 <name> <slice> |
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290 <name>
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291
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292 slice ::= highest | lowest | highest <number> | lowest <number>
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293
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294 condition ::= <relation> <unit>
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295
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296 low-op ::= + | -
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297
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298 high-op ::= * | / | mod| max | min
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299
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300 number ::= <digit>+ | -<digit>+
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301
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302 name ::= <letter>[<letter>|<digit>]*
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303
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304 letter ::= A-Z | a-z
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305
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306 digit ::= 0-9
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307
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308 relation ::= < | > | <= | >= | => | =< | = | ==
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309