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44 lines
2 KiB
Plaintext
44 lines
2 KiB
Plaintext
Example: *** Delicious, Delicious Rocks
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Location: Check, carry out, report
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RecipeLocation: Food
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Index: Sanity-check stage before the Before rules
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Description: Adding a "sanity-check" stage to decide whether an action makes any sense, which occurs before any before rules, implicit taking, or check rules.
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For: Z-Machine
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In some cases, we may want to add new stages to action processing. One possibility is a stage where we check the sanity of what the player is trying to do before executing any of the other commands; so that we avoid, for instance
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>EAT ROCK
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(first taking the rock)
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That's plainly inedible.
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Here is how we might insert such a stage in our action processing, using rulebook manipulation.
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{*}"Delicious, Delicious Rocks"
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Section 1 - Procedure
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The sanity-check rules are a rulebook.
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This is the sanity-check stage rule:
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abide by the sanity-check rules.
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The sanity-check stage rule is listed after the before stage rule in the action-processing rules.
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Section 2 - Scenario
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Candyland is a room. The lollipop tree is an edible thing in Candyland. The genuine rock is a thing in Candyland.
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Sanity-check eating an inedible thing:
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say "Your digestion is so delicate -- you're sure [the noun] wouldn't agree with you." instead.
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Test me with "eat lollipop / eat rock".
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Notice that now Inform does not try taking the rock before rejecting the player's attempt to eat it.
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It is of course possible to get the same effect with
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Before eating an inedible thing:
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say "Your digestion is so delicate -- you're sure [the noun] wouldn't agree with you." instead.
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...and in a small game with few rules, there's not much reason to add an extra stage. The ability to modify the stages of action processing becomes useful when we have a fairly large game with sophisticated modeling and want to be sure that some kinds of message (such as the sanity-check) are always handled before other things that we might be doing at the before stage (such as generating implicit actions like opening doors before going through them).
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