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# |
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# This file is part of Deliantra, the Roguelike Realtime MMORPG. |
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# |
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# Copyright (©) 2009,2010 Marc Alexander Lehmann / Robin Redeker / the Deliantra team |
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# |
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# Deliantra is free software: you can redistribute it and/or modify it under |
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# the terms of the Affero GNU General Public License as published by the |
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# Free Software Foundation, either version 3 of the License, or (at your |
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# option) any later version. |
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# |
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# This program is distributed in the hope that it will be useful, |
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# but WITHOUT ANY WARRANTY; without even the implied warranty of |
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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# GNU General Public License for more details. |
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# |
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# You should have received a copy of the Affero GNU General Public License |
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# and the GNU General Public License along with this program. If not, see |
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# <http://www.gnu.org/licenses/>. |
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# |
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# The authors can be reached via e-mail to <support@deliantra.net> |
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# |
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|
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=head1 NAME |
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|
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cf::match - object matching language |
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|
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=head1 DESCRIPTION |
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|
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This module implements a simple object matching language. It can be asked |
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to find any ("check for a match"), or all ("find all objects") matching |
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objects. |
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|
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=head1 MATCH EXAMPLES |
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|
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Match the object if it has a slaying field of C<key1>: |
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|
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slaying = "key1" |
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|
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Match the object if it has an object with name C<force> and |
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slaying C<poison> in it's inventory: |
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|
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has (name = "force" and slaying = "poison") |
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|
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Find all inventory objects with value >= 10, which are not invisible: |
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|
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value >= 10 and not invisible in inv |
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|
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Find all potions with spell objects inside them in someones inventory: |
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|
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type=SPELL in type=POTION in inv |
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|
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Find all scrolls inside someones inventory, or inside applied scroll |
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containers: |
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|
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type=SCROLL also in applied type=CONTAINER race="scroll" in inv |
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|
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Find all unpaid items, anywhere, even deeply nested inside other items, in |
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the originator: |
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|
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unpaid also deep in inv of originator |
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|
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=head1 MATCH EXPRESSIONS |
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|
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=head2 STRUCTURE |
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|
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The two main structures are the C<match>, which selects objects matching |
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various criteria, and the C<condition, which determines if an object |
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matches some desired properties: |
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|
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condition |
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condition in set-modifier |
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condition of root-object |
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|
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A C<condition> receives a set of "context objects" that it is applied |
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to. This is initially just one object - by default, for altars, it is the |
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object dropped on it, for pedestals, the object on top of it and so on. |
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|
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This set of context objects can be modified in various ways, for example |
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by replacing it with the inventories of all objects, or all items on the |
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same mapspace, and so on, by using the C<in> operator: |
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|
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condition in inv |
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condition in map |
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|
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Also, besides the default root object where all this begins, you can start |
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elsewhere, for example in the I<originator> (usually the player): |
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|
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condition in inv of originator |
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|
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Once the final set of context objects has been established, each object |
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is matched against the C<condition>. |
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|
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It is possible to chain modifiers from right-to-left, so this example |
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would start with the originator, take it's inventory, find all inventory |
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items which are potions, looks into their inventory, and then finds all |
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spells. |
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|
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type=SPELL in type=POTION in inv of originator |
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|
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Sometimes the server is only interested in knowing whether I<anything> |
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matches, and sometimes the server is interested in I<all> objects that |
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match. |
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|
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=head2 OPERATORS |
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|
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=over 4 |
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|
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=item and, or, not, () |
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|
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Conditions can be combined with C<and> or C<or> to build larger |
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expressions. C<not> negates the condition, and parentheses can be used to |
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override operator precedence and execute submatches. |
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|
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Not that C<not> only negates a condition and not the whole match |
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expressions, thus |
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|
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not applied in inv |
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|
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is true if there is I<any> non-applied object in the inventory. To negate |
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a whole match, you have to use a sub-match: To check whether there is |
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I<no> applied object in someones inventory, write this: |
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|
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not (applied in inv) |
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|
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Example: match applied weapons. |
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|
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applied type=WEAPON |
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|
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Example: match horns or rods. |
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|
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type=HORN or type=ROD |
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|
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Example: see if the originator is a player. |
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|
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type=PLAYER of originator |
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|
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=item in ... |
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|
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The in operator takes the context set and modifies it in various ways. As |
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a less technical description, think of the C<in> as being a I<look into> |
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or I<look at> operator - instead of looking at whatever was provided to |
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the match, the C<in> operator lets you look at other sets of objects, most |
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often the inventory. |
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|
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=over 4 |
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|
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=item in inv |
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|
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Replaces all objects by their inventory. |
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|
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Example: find all spell objects inside the object to be matched. |
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|
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type=SPELL in inv |
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|
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=item in env |
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|
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Replaces all objects by their containing object, if they have one. |
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|
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=item in arch |
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|
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Replaces all objects by their archetypes. |
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|
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=item in map |
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|
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Replaces all objects by the objects that are on the same mapspace as them. |
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|
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=item in head |
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|
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Replaces all objects by their head objects. |
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|
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=item in <condition> |
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|
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Finds all context objects matching the condition, and then puts their |
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inventories into the context set. |
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|
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Note that C<in inv> is simply a special case of an C<< in <condition> >> that |
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matches any object. |
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|
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Example: find all spells inside potions inside the inventory of the context |
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object(s). |
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|
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type=SPELL in type=POTION in inv |
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|
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=item also in ... |
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|
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Instead of replacing the context set with something new, the new objects |
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are added to the existing set. |
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|
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Example: check if the context object I<is> a spell, or I<contains> a spell. |
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|
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type=SPELL also in inv |
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|
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=item also deep in ... |
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|
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Repeats the operation as many times as possible. This can be used to |
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recursively look into objects. |
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|
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So for example, C<also deep in inv> means to take the inventory of all |
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objects, taking their inventories, and so on, and adding all these objects |
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to the context set. |
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|
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Similarly, C<also deep in env> means to take the environment object, their |
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environemnt object and so on. |
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|
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Example: check if there are any unpaid items in an inventory, |
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or in the inventories of the inventory objects, and so on. |
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|
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unpaid also deep in inv |
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|
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Example: check if a object is inside a player. |
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|
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type=PLAYER also deep in env |
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|
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=back |
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|
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=item of ... |
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|
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By default, all matches are applied to the "obviously appropriate" object, |
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such as the item dropped on a button or moving over a detector. This can |
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be changed to a number of other objects - not all of them are available |
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for each match (when not available, the match will simply fail). |
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|
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An C<of> term ends a match, nothing is allowed to follow. |
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|
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=over 4 |
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|
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=item of object |
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|
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Starts with the default object - this is the object passed to the match to |
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match against by default. Matches have an explicit C<of object> appended, |
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but submatches start at the current object, and in this case C<of object> |
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can be used to start at the original object once more. |
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|
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=item of source |
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|
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Starts with the I<source> object - this object is sometimes passed to |
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matches and represents the object that is the source of the action, such |
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as a rod or a potion when it is applied. Often, the I<source> is the same |
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as the I<originator>. |
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|
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=item of originator |
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|
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Starts with the I<originator> - one step farther removed than the |
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I<source>, the I<originator> is sometimes passed to matches and represents |
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the original initiator of an action, most commonly a player or monster. |
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|
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This object is often identical to the I<source> (e.g. when a player casts |
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a spell, the player is both source and originator). |
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|
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=item of self |
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|
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Starts with the object initiating/asking for the match - this is basically |
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always the object that the match expression is attached to. |
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|
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=back |
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|
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=head2 EXPRESSIONS |
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|
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Expressions used in conditions usually consist of simple boolean checks |
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(flag XYZ is set) or simple comparisons. |
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|
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=over 4 |
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|
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=item flags |
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|
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Flag names (without the leading C<FLAG_>) can be used as-is, in which case |
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their corresponding flag value is used. |
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|
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=item scalar object attributes |
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|
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Object attributes that consist of a single value (C<name>, C<title>, |
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C<value> and so on) can be specified by simply using their name, in which |
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acse their corresponding value is used. |
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|
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=item array objects attributes |
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|
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The C<resist> array can be accessed by specifying C<< resist [ ATNR_type ] |
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>>. |
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|
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Example: match an acid resistance higher than 30. |
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|
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resist[ATNR_ACID] > 30 |
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|
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=item functions |
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|
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Some additional functions with or without arguments in parentheses are |
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available. |
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|
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=item { BLOCK } |
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|
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You can specify perl code to execute by putting it inside curly |
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braces. The last expression evaluated inside will become the result. |
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|
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The perlcode can access C<$_>, which rferes to the object currently being |
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matches, and the C<$object>, C<$self>, C<$source> and C<$originator>. |
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|
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Example: check whether the slaying field consists of digits only. |
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|
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{ $_->slaying =~ /^\d+$/ } |
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|
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=item comparisons, <, <=, ==, =, !=, =>, > |
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|
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You can compare expressions against constants via any of these |
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operators. If the constant is a string, then a string compare will be |
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done, otherwise a numerical comparison is used. |
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|
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Example: match an object with name "schnops" that has a value >= 10. |
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|
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name="schnops" and value >= 10 |
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|
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=item uppercase constant names |
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|
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Any uppercase word that exists as constant inside the C<cf::> namespace |
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(that is, any deliantra constant) can also be used as-is, but needs to be |
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specified in uppercase. |
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|
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Example: match a type of POTION (using C<cf::POTION>). |
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|
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type=POTION |
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|
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=back |
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|
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=head2 FUNCTIONS |
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|
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=over 4 |
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|
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=item any |
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|
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This simply evaluates to true, and simply makes matching I<any> object a |
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bit easier to read. |
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|
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=item none |
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|
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This simply evaluates to false, and simply makes matching I<never> a bit |
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easier to read. |
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|
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=item has(condition) |
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|
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True iff the object has a matching inventory object. |
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|
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=item count(match) |
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|
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Number of matching objects - the context object for the C<match> is the |
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currently tested object - you can override this with an C<in object> for |
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example. |
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|
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=item dump() |
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|
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Dumps the object to the server log when executed, and evaluates to true. |
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|
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Note that logical operations are short-circuiting, so this only dumps |
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potions: |
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|
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type=POTION and dump() |
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|
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=back |
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|
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=head2 GRAMMAR |
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|
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This is the grammar that was used to implement the matching language |
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module. It is meant to be easily readable by humans, not to implement it |
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exactly as-is. |
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|
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# object matching and selecting |
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|
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match = chain |
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| chain 'of' root |
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root = 'object' | 'self' | 'source' | 'originator' |
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chain = condition |
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| chain also deep 'in' modifier |
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also = nothing | 'also' |
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deep = nothing | 'deep' |
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modifier ='inv' | 'env' | 'arch' | 'map' | 'head' |
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|
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nothing = |
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|
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# boolean matching condition |
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|
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condition = factor |
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| factor 'and'? condition |
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| factor 'or' condition |
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|
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factor = 'not' factor |
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| '(' match ')' |
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| expr |
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| expr operator constant |
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|
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operator = '=' | '==' | '!=' | '<' | '<=' | '>' | '>=' |
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|
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expr = flag |
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| sattr |
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| aattr '[' <constant> ']' |
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| 'stat.' statattr |
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| special |
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| func '(' args ')' |
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| '{' perl code block '}' |
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|
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func = <any function name> |
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sattr = <any scalar object attribute> |
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aattr = <any array object attribute> |
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flag = <any object flag> |
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statattr = <any stat attribute: exp, food, str, dex, hp, maxhp...> |
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special = <any ()-less "function"> |
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|
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constant = <number> | '"' <string> '"' | <uppercase cf::XXX name> |
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args = <depends on function> |
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|
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TODO: contains, matches, query_name, selling_price, buying_price? |
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|
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=cut |
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|
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=head2 PERL FUNCTIONS |
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|
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=over 4 |
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|
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=cut |
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|
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package cf::match; |
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|
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use common::sense; |
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|
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use List::Util (); |
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|
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{ |
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package cf::match::exec; |
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|
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use List::Util qw(first); |
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|
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package cf::match::parser; |
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|
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use common::sense; |
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|
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sub ws { |
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/\G\s+/gc; |
| 435 |
} |
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|
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sub condition (); |
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sub match ($$); |
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|
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our %func = ( |
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has => sub { |
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'first { ' . condition . ' } $_->inv' |
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}, |
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count => sub { |
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'(scalar ' . (match 1, '$_') . ')' |
| 446 |
}, |
| 447 |
dump => sub { |
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'do { |
| 449 |
warn "cf::match::match dump:\n" |
| 450 |
. "self: " . eval { $self->name } . "\n" |
| 451 |
. $_->as_string; |
| 452 |
1 |
| 453 |
}'; |
| 454 |
}, |
| 455 |
); |
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|
| 457 |
our %special = ( |
| 458 |
any => sub { |
| 459 |
1 |
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}, |
| 461 |
none => sub { |
| 462 |
0 |
| 463 |
}, |
| 464 |
); |
| 465 |
|
| 466 |
sub constant { |
| 467 |
ws; |
| 468 |
|
| 469 |
return $1 if /\G([\-\+0-9\.]+)/gc; |
| 470 |
return "cf::$1" if /\G([A-Z0-9_]+)/gc; |
| 471 |
|
| 472 |
#TODO better string parsing, also include '' |
| 473 |
return $1 if /\G("[^"]+")/gc; |
| 474 |
|
| 475 |
die "number, string or uppercase constant name expected\n"; |
| 476 |
} |
| 477 |
|
| 478 |
our $flag = $cf::REFLECT{object}{flags}; |
| 479 |
our $sattr = $cf::REFLECT{object}{scalars}; |
| 480 |
# quick hack to support archname, untested |
| 481 |
$sattr->{archname} = "W"; |
| 482 |
our $aattr = $cf::REFLECT{object}{arrays}; |
| 483 |
our $lattr = $cf::REFLECT{living}{scalars}; |
| 484 |
|
| 485 |
sub expr { |
| 486 |
# ws done by factor |
| 487 |
my $res; |
| 488 |
|
| 489 |
if (/\G ( \{ (?: (?> [^{}]+ ) | (?-1) )* \} ) /gcx) { |
| 490 |
# perl |
| 491 |
|
| 492 |
my $expr = $1; |
| 493 |
|
| 494 |
$res .= $expr =~ /\{([^;]+)\}/ ? $1 : "do $expr"; |
| 495 |
|
| 496 |
} elsif (/\Gstats\.([A-Za-z0-9_]+)/gc) { |
| 497 |
|
| 498 |
if (exists $lattr->{$1}) { |
| 499 |
$res .= "\$_->stats->$1"; |
| 500 |
} elsif (exists $lattr->{"\u$1"}) { |
| 501 |
$res .= "\$_->stats->\u$1"; |
| 502 |
} else { |
| 503 |
die "living statistic name expected (str, pow, hp, sp...)\n"; |
| 504 |
} |
| 505 |
|
| 506 |
} elsif (/\G([A-Za-z0-9_]+)/gc) { |
| 507 |
|
| 508 |
if (my $func = $func{$1}) { |
| 509 |
/\G\s*\(/gc |
| 510 |
or die "'(' expected after function name\n"; |
| 511 |
|
| 512 |
$res .= $func->(); |
| 513 |
|
| 514 |
/\G\s*\)/gc |
| 515 |
or die "')' expected after function arguments\n"; |
| 516 |
|
| 517 |
} elsif (my $func = $special{$1}) { |
| 518 |
$res .= $func->(); |
| 519 |
|
| 520 |
} elsif (exists $flag->{lc $1}) { |
| 521 |
$res .= "\$_->flag (cf::FLAG_\U$1)"; |
| 522 |
|
| 523 |
} elsif (exists $sattr->{$1}) { |
| 524 |
$res .= "\$_->$1"; |
| 525 |
|
| 526 |
} elsif (exists $aattr->{$1}) { |
| 527 |
|
| 528 |
$res .= "\$_->$1"; |
| 529 |
|
| 530 |
/\G\s*\[/gc |
| 531 |
or die "'[' expected after array name\n"; |
| 532 |
|
| 533 |
$res .= "(" . constant . ")"; |
| 534 |
|
| 535 |
/\G\s*\]/gc |
| 536 |
or die "']' expected after array index\n"; |
| 537 |
|
| 538 |
} else { |
| 539 |
$res .= constant; |
| 540 |
} |
| 541 |
|
| 542 |
} else { |
| 543 |
Carp::cluck;#d# |
| 544 |
die "expr expected\n"; |
| 545 |
} |
| 546 |
|
| 547 |
$res |
| 548 |
} |
| 549 |
|
| 550 |
our %stringop = ( |
| 551 |
"==" => "eq", |
| 552 |
"!=" => "ne", |
| 553 |
"<=" => "le", |
| 554 |
">=" => "ge", |
| 555 |
"<" => "lt", |
| 556 |
">" => "gt", |
| 557 |
); |
| 558 |
|
| 559 |
sub factor { |
| 560 |
ws; |
| 561 |
|
| 562 |
my $res; |
| 563 |
|
| 564 |
if (/\Gnot\b\s*/gc) { |
| 565 |
$res .= "!"; |
| 566 |
} |
| 567 |
|
| 568 |
if (/\G\(/gc) { |
| 569 |
# () |
| 570 |
|
| 571 |
$res .= '(' . (match 0, '$_') . ')'; |
| 572 |
|
| 573 |
/\G\s*\)/gc or die "closing ')' expected\n"; |
| 574 |
|
| 575 |
} else { |
| 576 |
my $expr = expr; |
| 577 |
|
| 578 |
$res .= $expr; |
| 579 |
|
| 580 |
if (/\G\s*([=!<>]=?)/gc) { |
| 581 |
my $op = $1; |
| 582 |
|
| 583 |
$op = "==" if $op eq "="; |
| 584 |
my $const = constant; |
| 585 |
$op = $stringop{$op} if $const =~ /^"/; |
| 586 |
|
| 587 |
$res .= " $op $const"; |
| 588 |
} |
| 589 |
} |
| 590 |
|
| 591 |
"($res)" |
| 592 |
} |
| 593 |
|
| 594 |
sub condition () { |
| 595 |
my $res = factor; |
| 596 |
|
| 597 |
while () { |
| 598 |
ws; |
| 599 |
|
| 600 |
# first check some stop-symbols, so we don't have to backtrack |
| 601 |
if (/\G(?=also\b|deep\b|in\b|of\b|\)|\z)/gc) { |
| 602 |
pos = pos; # argh. the misop hits again. again. again. again. you die. |
| 603 |
last; |
| 604 |
|
| 605 |
} elsif (/\Gor\b/gc) { |
| 606 |
$res .= " || "; |
| 607 |
|
| 608 |
} else { |
| 609 |
/\Gand\b/gc; |
| 610 |
$res .= " && "; |
| 611 |
} |
| 612 |
$res .= factor; |
| 613 |
} |
| 614 |
|
| 615 |
$res |
| 616 |
} |
| 617 |
|
| 618 |
sub match ($$) { |
| 619 |
my ($wantarray, $defctx) = @_; |
| 620 |
|
| 621 |
my $res = condition; |
| 622 |
|
| 623 |
# if nothing follows, we have a simple condition, so |
| 624 |
# optimise a comon case. |
| 625 |
if ($defctx eq '$_' and /\G\s*(?=\)|$)/gc) { |
| 626 |
return $wantarray |
| 627 |
? "$res ? \$_ : ()" |
| 628 |
: $res; |
| 629 |
} |
| 630 |
|
| 631 |
$res = ($wantarray ? " grep { " : " first { ") . $res . "}"; |
| 632 |
|
| 633 |
while () { |
| 634 |
ws; |
| 635 |
|
| 636 |
my $also = /\Galso\s+/gc + 0; |
| 637 |
my $deep = /\Gdeep\s+/gc + 0; |
| 638 |
|
| 639 |
if (/\Gin\s+/gc) { |
| 640 |
my $expand; |
| 641 |
|
| 642 |
if (/\G(inv|env|map|arch|head)\b/gc) { |
| 643 |
if ($1 eq "inv") { |
| 644 |
$expand = "map \$_->inv,"; |
| 645 |
} elsif ($1 eq "env") { |
| 646 |
$expand = "map \$_->env // (),"; |
| 647 |
} elsif ($1 eq "head") { |
| 648 |
$expand = "map \$_->head,"; |
| 649 |
$deep = 0; # infinite loop otherwise |
| 650 |
} elsif ($1 eq "arch") { |
| 651 |
$expand = "map \$_->arch,"; |
| 652 |
$deep = 0; # infinite loop otherwise |
| 653 |
} elsif ($1 eq "map") { |
| 654 |
$expand = "map \$_->map->at (\$_->x, \$_->y),"; |
| 655 |
$deep = 0; # infinite loop otherwise |
| 656 |
} |
| 657 |
} else { |
| 658 |
$expand = "map \$_->inv, grep { " . condition . " }"; |
| 659 |
} |
| 660 |
|
| 661 |
if ($also || $deep) { |
| 662 |
$res .= " do {\n" |
| 663 |
. " my \@res;\n"; |
| 664 |
$res .= " while (\@_) {\n" if $deep; |
| 665 |
$res .= " push \@res, \@_;\n" if $also; |
| 666 |
$res .= " \@_ = $expand \@_;\n"; |
| 667 |
$res .= " }\n" if $deep; |
| 668 |
$res .= " (\@res, \@_)\n" |
| 669 |
. "}"; |
| 670 |
} else { |
| 671 |
$res .= " $expand"; |
| 672 |
} |
| 673 |
} else { |
| 674 |
|
| 675 |
if (/\Gof\s+(self|object|source|originator)\b/gc) { |
| 676 |
$also || $deep |
| 677 |
and die "neither 'also' nor 'deep' can be used with 'of'\n"; |
| 678 |
|
| 679 |
if ($1 eq "self") { |
| 680 |
return "$res \$self // ()"; |
| 681 |
} elsif ($1 eq "object") { |
| 682 |
return "$res \$object"; |
| 683 |
} elsif ($1 eq "source") { |
| 684 |
return "$res \$source // ()"; |
| 685 |
} elsif ($1 eq "originator") { |
| 686 |
return "$res \$originator // \$source // ()"; |
| 687 |
} |
| 688 |
} else { |
| 689 |
return "$res $defctx"; |
| 690 |
} |
| 691 |
} |
| 692 |
} |
| 693 |
} |
| 694 |
} |
| 695 |
|
| 696 |
sub parse($$) { # wantarray, matchexpr |
| 697 |
my $res; |
| 698 |
|
| 699 |
local $_ = $_[1]; |
| 700 |
|
| 701 |
eval { |
| 702 |
$res = cf::match::parser::match $_[0], "\$object"; |
| 703 |
|
| 704 |
/\G$/gc |
| 705 |
or die "unexpected trailing characters after match\n"; |
| 706 |
}; |
| 707 |
|
| 708 |
if ($@) { |
| 709 |
my $ctx = 20; |
| 710 |
my $str = substr $_, (List::Util::max 0, (pos) - $ctx), $ctx * 2; |
| 711 |
substr $str, (List::Util::min $ctx, pos), 0, "<-- HERE -->"; |
| 712 |
|
| 713 |
chomp $@; |
| 714 |
die "$@ ($str)\n"; |
| 715 |
} |
| 716 |
|
| 717 |
$res |
| 718 |
} |
| 719 |
|
| 720 |
if (0) {#d# |
| 721 |
die parse 1, 'stats.pow'; |
| 722 |
exit 0; |
| 723 |
} |
| 724 |
|
| 725 |
our %CACHE; |
| 726 |
|
| 727 |
sub compile($$) { |
| 728 |
my ($wantarray, $match) = @_; |
| 729 |
my $expr = parse $wantarray, $match; |
| 730 |
# warn "MATCH DEBUG $match,$wantarray => $expr\n";#d# |
| 731 |
$expr = eval " |
| 732 |
package cf::match::exec; |
| 733 |
sub { |
| 734 |
my (\$object, \$self, \$source, \$originator) = \@_; |
| 735 |
$expr |
| 736 |
} |
| 737 |
"; |
| 738 |
die if $@; |
| 739 |
|
| 740 |
$expr |
| 741 |
} |
| 742 |
|
| 743 |
=item cf::match::match $match, $object[, $self[, $source[, $originator]]] |
| 744 |
|
| 745 |
Compiles (and caches) the C<$match> expression and matches it against |
| 746 |
the C<$object>. C<$self> should be the object initiating the match (or |
| 747 |
C<undef>), C<$source> should be the actor/source and C<$originator> the |
| 748 |
object that initiated the action (such as the player). C<$originator> |
| 749 |
defaults to C<$source> when not given. |
| 750 |
|
| 751 |
In list context it finds and returns all matching objects, in scalar |
| 752 |
context only a true or false value. |
| 753 |
|
| 754 |
=cut |
| 755 |
|
| 756 |
sub match($$;$$$) { |
| 757 |
my $match = shift; |
| 758 |
my $wantarray = wantarray+0; |
| 759 |
|
| 760 |
&{ |
| 761 |
$CACHE{"$wantarray$match"} ||= compile $wantarray, $match |
| 762 |
} |
| 763 |
} |
| 764 |
|
| 765 |
our $CACHE_CLEARER = AE::timer 3600, 3600, sub { |
| 766 |
%CACHE = (); |
| 767 |
}; |
| 768 |
|
| 769 |
#d# $::schmorp=cf::player::find "schmorp"& |
| 770 |
#d# cf::match::match '', $::schmorp->ob |
| 771 |
|
| 772 |
|
| 773 |
=back |
| 774 |
|
| 775 |
=head1 AUTHOR |
| 776 |
|
| 777 |
Marc Lehmann <schmorp@schmorp.de> |
| 778 |
http://home.schmorp.de/ |
| 779 |
|
| 780 |
=cut |
| 781 |
|
| 782 |
1; |
| 783 |
|
