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< ul class = "crumbs" > < li > < a href = "../index.html" > Home< / a > < / li > < li > < a href = "../inform7n.html" > Inform7< / a > < / li > < li > < a href = "index.html" > runtime< / a > < / li > < li > < a href = "index.html#6" > Chapter 6: Completion Resources< / a > < / li > < li > < b > The Map< / b > < / li > < / ul > < / div >
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< p class = "purpose" > The runtime representation of the spatial map for works of interactive fiction: that is, how the rooms and doors connect up.< / p >
< p class = "commentary firstcommentary" > < a id = "SP1" class = "paragraph-anchor" > < / a > < b > § 1. < / b > One of the few early breaks with I6 practice was that I7 stores the
map differently at run-time compared to earlier I6 games.
< / p >
< p class = "commentary" > The < span class = "extract" > < span class = "extract-syntax" > Map_Storage< / span > < / span > array consists only of the < span class = "extract" > < span class = "extract-syntax" > exits< / span > < / span > arrays written out
one after another. It looks wasteful of memory, since it is almost always
going to be filled mostly with < span class = "extract" > < span class = "extract-syntax" > 0< / span > < / span > entries (meaning: no exit that way). But
the memory needs to be there because map connections can be added dynamically
at run-time, so we can't know now how many we will need.
< / p >
< pre class = "displayed-code all-displayed-code code-font" >
< span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > RTMap::compile_model_tables< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > inter_name< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > ndi< / span > < span class = "plain-syntax" > = < / span > < a href = "2-hrr.html#SP11" class = "function-link" > < span class = "function-syntax" > Hierarchy::find< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "constant-syntax" > NO_DIRECTIONS_HL< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-emt.html#SP6" class = "function-link" > < span class = "function-syntax" > Emit::numeric_constant< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > ndi< / span > < span class = "plain-syntax" > , (< / span > < span class = "identifier-syntax" > inter_ti< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > Map::number_of_directions< / span > < span class = "plain-syntax" > ());< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-hrr.html#SP17" class = "function-link" > < span class = "function-syntax" > Hierarchy::make_available< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > ndi< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > instance< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > I< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > LOOP_OVER_INSTANCES< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > I< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > K_object< / span > < span class = "plain-syntax" > )< / span >
< span class = "plain-syntax" > < / span > < a href = "5-ins.html#SP1" class = "function-link" > < span class = "function-syntax" > RTInstances::value_iname< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > I< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > inter_name< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > iname< / span > < span class = "plain-syntax" > = < / span > < a href = "2-hrr.html#SP11" class = "function-link" > < span class = "function-syntax" > Hierarchy::find< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "constant-syntax" > MAP_STORAGE_HL< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > packaging_state< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > save< / span > < span class = "plain-syntax" > = < / span > < a href = "2-ea.html#SP2" class = "function-link" > < span class = "function-syntax" > EmitArrays::begin_word< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > iname< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > K_object< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > words_used< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Task::wraps_existing_storyfile< / span > < span class = "plain-syntax" > ()) {< / span >
< span class = "plain-syntax" > < / span > < a href = "2-ea.html#SP4" class = "function-link" > < span class = "function-syntax" > EmitArrays::iname_entry< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < a href = "2-ea.html#SP4" class = "function-link" > < span class = "function-syntax" > EmitArrays::iname_entry< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < a href = "2-ea.html#SP4" class = "function-link" > < span class = "function-syntax" > EmitArrays::iname_entry< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < a href = "2-ea.html#SP4" class = "function-link" > < span class = "function-syntax" > EmitArrays::iname_entry< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > words_used< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > 4< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > } < / span > < span class = "reserved-syntax" > else< / span > < span class = "plain-syntax" > {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > instance< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > I< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > LOOP_OVER_INSTANCES< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > I< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > K_object< / span > < span class = "plain-syntax" > )< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Spatial::object_is_a_room< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > I< / span > < span class = "plain-syntax" > )) {< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > N< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > Map::number_of_directions< / span > < span class = "plain-syntax" > ();< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > for< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > =0; < / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > < < / span > < span class = "identifier-syntax" > N< / span > < span class = "plain-syntax" > ; < / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > ++) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > instance< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > to< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > MAP_EXIT< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > I< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > to< / span > < span class = "plain-syntax" > )< / span >
< span class = "plain-syntax" > < / span > < a href = "2-ea.html#SP4" class = "function-link" > < span class = "function-syntax" > EmitArrays::iname_entry< / span > < / a > < span class = "plain-syntax" > (< / span > < a href = "5-ins.html#SP1" class = "function-link" > < span class = "function-syntax" > RTInstances::value_iname< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > to< / span > < span class = "plain-syntax" > ));< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > else< / span >
< span class = "plain-syntax" > < / span > < a href = "2-ea.html#SP4" class = "function-link" > < span class = "function-syntax" > EmitArrays::numeric_entry< / span > < / a > < span class = "plain-syntax" > (0);< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > words_used< / span > < span class = "plain-syntax" > ++;< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > }< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-ea.html#SP5" class = "function-link" > < span class = "function-syntax" > EmitArrays::end< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > save< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-hrr.html#SP17" class = "function-link" > < span class = "function-syntax" > Hierarchy::make_available< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > iname< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > FALSE< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
< / pre >
< p class = "commentary firstcommentary" > < a id = "SP2" class = "paragraph-anchor" > < / a > < b > § 2. < / b > This may as well be here as anywhere else: it specifies how to read or
change the map, by testing or asserting the "mapped D of" relation for a
given direction D, which appears here in the guise of its instance < span class = "extract" > < span class = "extract-syntax" > I< / span > < / span > :
< / p >
< pre class = "displayed-code all-displayed-code code-font" >
< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > RTMap::set_map_schemas< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > binary_predicate< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > bp< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > instance< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > I< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > inter_name< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > ident< / span > < span class = "plain-syntax" > = < / span > < a href = "5-ins.html#SP1" class = "function-link" > < span class = "function-syntax" > RTInstances::value_iname< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > I< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > bp< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > task_functions< / span > < span class = "plain-syntax" > [< / span > < span class = "identifier-syntax" > TEST_ATOM_TASK< / span > < span class = "plain-syntax" > ] =< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Calculus::Schemas::new< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "(MapConnection(*2,%n) == *1)"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > ident< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > bp< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > task_functions< / span > < span class = "plain-syntax" > [< / span > < span class = "identifier-syntax" > NOW_ATOM_TRUE_TASK< / span > < span class = "plain-syntax" > ] =< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Calculus::Schemas::new< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "AssertMapConnection(*2,%n,*1)"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > ident< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > bp< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > task_functions< / span > < span class = "plain-syntax" > [< / span > < span class = "identifier-syntax" > NOW_ATOM_FALSE_TASK< / span > < span class = "plain-syntax" > ] =< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Calculus::Schemas::new< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "AssertMapUnconnection(*2,%n,*1)"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > ident< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > }< / span >
< / pre >
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