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82 lines
4.1 KiB
Plaintext
82 lines
4.1 KiB
Plaintext
*** Understanding things by their properties
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(Channel: 2. Television with more advanced parsing--Television with channels, advanced)
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Understanding channels (a number) in the names of televisions, with more sophisticated parsing of the change channel action.
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Our previous implementation of televisions ("Channel 1") doesn't allow the player to type things like
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TUNE FIFTIES TELEVISION TO CHANNEL 4
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nor does it deal with player input like
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TUNE TO CHANNEL 4 ON FIFTIES TELEVISION
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or
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TUNE TO CHANNEL 4
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where no television is specified. When we are designing commands which involve two elements (here, a television and a channel number), it's usually a good idea to allow the player to specify those elements in either order, as we saw demonstrated briefly in "New commands for old grammar".
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We might, therefore, want to add a few refinements: first by defining a "[channel]" token that will accept input of the forms "[number]" and "channel [number]", and second by creating some additional "Understand" lines that will accept variant versions of the player's input.
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{*}"Channel 2"
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Section 1 - Televisions in General
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A television is a kind of device.
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A television has a number called the channel. Understand the channel property as referring to a television. Understand "channel" as a television.
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Changing the channel of it to is an action applying to one thing and one number.
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Understand "tune [television] to [channel]" or "change channel of [television] to [channel]" as changing the channel of it to.
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Understand "tune [something] to [channel]" or "change channel of [something] to [channel]" as changing the channel of it to.
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Understand "tune to [channel] on [television]" or "change to [channel] on [television]" as changing the channel of it to (with nouns reversed).
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Understand "tune to [channel] on [something]" or "change to [channel] on [something]" as changing the channel of it to (with nouns reversed).
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Understand "[number]" or "channel [number]" as "[channel]".
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Check changing the channel of something to:
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if the noun is not a television, say "[The noun] cannot be tuned to a channel." instead.
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Carry out changing the channel of something to:
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now the channel of the noun is the number understood.
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Report changing the channel of something to:
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say "You tune [the noun] to channel [number understood]."
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Instead of examining a television:
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if the noun is switched off, say "[The noun] is currently turned off." instead;
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let the chosen channel be the channel of the noun;
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if the chosen channel is a current channel listed in the Table of Television Channels:
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choose row with current channel of the chosen channel in the Table of Television Channels;
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say "[output entry][paragraph break]";
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otherwise:
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say "Snow fills the screen of [the noun]."
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Table of Television Channels
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current channel output
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0 "The screen of [the noun] is completely black."
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Section 2 - The Scenario
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The Office is a room.
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The widescreen TV is a television in the Office. The fifties TV is a television in the Office.
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And we add the scenario-specific content to our Table of Television Channels; in the case of channel 13, we provide for a changing sequence of events using text variations.
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{**}Table of Television Channels (continued)
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current channel output
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4 "A gloomy female news anchor describes the latest car bomb in Baghdad: 104 dead today, and no sign of change."
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5 "A couple of contestants in spangled scarlet outfits are performing an energetic paso doble."
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13 "[one of]On-screen, Ichiro is up to bat with one man on second and no outs.[or]Ichiro has singled to first and the other man is on third.[or]The next batter is in the middle of flying out.[or]Everything looks rosy until the men in black pull off a double-play and retire the side.[or]The channel has cut to a commercial.[stopping]"
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Test me with "test one / test two".
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Test one with "change channel of fifties tv to 4 / x channel 4 / switch on fifties / x channel 4 / switch on widescreen / tune fifties tv to channel 5 / x channel 5 / x fifties tv / x channel 4".
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Test two with "tune to channel 13 / widescreen / tune channel 13 to channel 5 / tune channel 5 to channel 3 / widescreen / x channel 3".
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