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<!--Weave of 'S/ut' generated by 7-->
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<ul class="crumbs"><li><a href="../webs.html">Source</a></li><li><a href="../extensions.html">Kits</a></li><li><a href="index.html">BasicInformKit</a></li><li><b>Utilities Template</b></li></ul><p class="purpose">Miscellaneous utility routines for some fundamental I6 needs.</p>
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<ul class="toc"><li><a href="#SP1">§1. Miscellany</a></li><li><a href="#SP2">§2. Language of Play</a></li><li><a href="#SP3">§3. VM-Specific Code</a></li><li><a href="#SP4">§4. More</a></li><li><a href="#SP5">§5. Print Decimal Number</a></li><li><a href="#SP6">§6. Print Text</a></li><li><a href="#SP7">§7. Properties</a></li><li><a href="#SP8">§8. Print Or Run</a></li><li><a href="#SP9">§9. Saying Phrases</a></li><li><a href="#SP10">§10. Kinds</a></li><li><a href="#SP11">§11. GenerateRandomNumber</a></li><li><a href="#SP12">§12. PrintSpaces</a></li><li><a href="#SP13">§13. SwapWorkflags</a></li><li><a href="#SP14">§14. TestUseOption</a></li><li><a href="#SP15">§15. ZRegion</a></li><li><a href="#SP16">§16. Memcpy</a></li><li><a href="#SP17">§17. Arrcpy</a></li><li><a href="#SP18">§18. Verbs as Values</a></li><li><a href="#SP19">§19. Seed Random Number Generator Rule</a></li><li><a href="#SP20">§20. Extracting Verb Numbers</a></li><li><a href="#SP21">§21. Say One Of</a></li><li><a href="#SP22">§22. Rounding</a></li></ul><hr class="tocbar">
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<p class="inwebparagraph"><a id="SP1"></a><b>§1. Miscellany. </b></p>
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<pre class="display">
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<span class="plain">#</span><span class="identifier">ifdef</span><span class="plain"> </span><span class="identifier">TARGET_ZCODE</span><span class="plain">;</span>
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<span class="reserved">Constant</span><span class="plain"> </span><span class="identifier">BLOCKV_STACK_SIZE</span><span class="plain"> = </span><span class="constant">224</span><span class="plain">;</span>
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<span class="plain">#</span><span class="identifier">ifnot</span><span class="plain">;</span>
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<span class="reserved">Constant</span><span class="plain"> </span><span class="identifier">BLOCKV_STACK_SIZE</span><span class="plain"> = </span><span class="identifier">DynamicMemoryAllocation</span><span class="plain">/4;</span>
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<span class="plain">#</span><span class="identifier">endif</span><span class="plain">;</span>
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<span class="reserved">Array</span><span class="plain"> </span><span class="identifier">blockv_stack</span><span class="plain"> --> </span><span class="identifier">BLOCKV_STACK_SIZE</span><span class="plain">;</span>
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<span class="identifier">Global</span><span class="plain"> </span><span class="identifier">I7SFRAME</span><span class="plain">;</span>
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<span class="identifier">Global</span><span class="plain"> </span><span class="identifier">TEXT_TY_RE_Err</span><span class="plain"> = </span><span class="constant">0</span><span class="plain">;</span>
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<span class="identifier">Global</span><span class="plain"> </span><span class="identifier">prior_named_noun</span><span class="plain">; </span><span class="comment">for adaptive text generation</span>
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<span class="identifier">Global</span><span class="plain"> </span><span class="identifier">prior_named_list</span><span class="plain">; </span><span class="comment">ditto: length of list of items</span>
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<span class="identifier">Global</span><span class="plain"> </span><span class="identifier">prior_named_list_gender</span><span class="plain">; </span><span class="comment">ditto: common gender of list of items, or -1</span>
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<span class="identifier">Global</span><span class="plain"> </span><span class="identifier">story_tense</span><span class="plain"> = </span><span class="constant">1</span><span class="plain">; </span><span class="comment">ditto: present tense</span>
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<span class="identifier">Global</span><span class="plain"> </span><span class="identifier">story_viewpoint</span><span class="plain"> = </span><span class="constant">2</span><span class="plain">; </span><span class="comment">ditto: second person singular</span>
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<span class="identifier">Global</span><span class="plain"> </span><span class="identifier">say__p</span><span class="plain"> = </span><span class="constant">1</span><span class="plain">; </span><span class="identifier">Global</span><span class="plain"> </span><span class="identifier">say__pc</span><span class="plain"> = </span><span class="constant">0</span><span class="plain">; </span><span class="identifier">Global</span><span class="plain"> </span><span class="identifier">say__pc_save</span><span class="plain"> = </span><span class="constant">0</span><span class="plain">;</span>
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<span class="identifier">Global</span><span class="plain"> </span><span class="identifier">say__n</span><span class="plain">; </span><span class="identifier">Global</span><span class="plain"> </span><span class="identifier">say__comp</span><span class="plain">;</span>
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<span class="identifier">Global</span><span class="plain"> </span><span class="identifier">los_rv</span><span class="plain"> = </span><span class="reserved">false</span><span class="plain">;</span>
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<span class="identifier">Global</span><span class="plain"> </span><span class="identifier">parameter_object</span><span class="plain">; </span><span class="comment">= I7 "parameter-object" = I7 "container in question"</span>
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<span class="identifier">Global</span><span class="plain"> </span><span class="identifier">parameter_value</span><span class="plain">; </span><span class="comment">not typesafe in I7</span>
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<span class="reserved">Array</span><span class="plain"> </span><span class="identifier">deferred_calling_list</span><span class="plain"> --> </span><span class="constant">27</span><span class="plain">;</span>
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<span class="identifier">Global</span><span class="plain"> </span><span class="identifier">property_to_be_totalled</span><span class="plain">; </span><span class="comment">used to implement "total P of..."</span>
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<span class="identifier">Global</span><span class="plain"> </span><span class="identifier">property_loop_sign</span><span class="plain">; </span><span class="comment">+1 for increasing order, -1 for decreasing</span>
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<span class="identifier">Global</span><span class="plain"> </span><span class="identifier">suppress_scope_loops</span><span class="plain">;</span>
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<span class="identifier">Global</span><span class="plain"> </span><span class="identifier">temporary_value</span><span class="plain">; </span><span class="comment">can be used anywhere side-effects can't occur</span>
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<span class="comment">[13]</span>
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<span class="identifier">Global</span><span class="plain"> </span><span class="identifier">clr_fg</span><span class="plain"> = </span><span class="constant">1</span><span class="plain">; </span><span class="comment">foreground colour</span>
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<span class="identifier">Global</span><span class="plain"> </span><span class="identifier">clr_bg</span><span class="plain"> = </span><span class="constant">1</span><span class="plain">; </span><span class="comment">background colour</span>
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<span class="identifier">Global</span><span class="plain"> </span><span class="identifier">clr_fgstatus</span><span class="plain"> = </span><span class="constant">1</span><span class="plain">; </span><span class="comment">foreground colour of statusline</span>
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<span class="identifier">Global</span><span class="plain"> </span><span class="identifier">clr_bgstatus</span><span class="plain"> = </span><span class="constant">1</span><span class="plain">; </span><span class="comment">background colour of statusline</span>
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<span class="identifier">Global</span><span class="plain"> </span><span class="identifier">clr_on</span><span class="plain">; </span><span class="comment">has colour been enabled by the player?</span>
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<span class="identifier">Global</span><span class="plain"> </span><span class="identifier">statuswin_current</span><span class="plain">; </span><span class="comment">if writing to top window</span>
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<span class="identifier">Global</span><span class="plain"> </span><span class="identifier">suppress_text_substitution</span><span class="plain"> = </span><span class="reserved">false</span><span class="plain">;</span>
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<span class="identifier">Global</span><span class="plain"> </span><span class="identifier">deadflag</span><span class="plain"> = </span><span class="constant">0</span><span class="plain">;</span>
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<span class="comment">[14]</span>
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<span class="identifier">Global</span><span class="plain"> </span><span class="identifier">statuswin_cursize</span><span class="plain"> = </span><span class="constant">0</span><span class="plain">;</span>
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<span class="identifier">Global</span><span class="plain"> </span><span class="identifier">statuswin_size</span><span class="plain"> = </span><span class="constant">1</span><span class="plain">;</span>
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<span class="comment">[16]</span>
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<span class="comment">Global debug_flag = 0;</span>
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<span class="identifier">Global</span><span class="plain"> </span><span class="identifier">debug_rules</span><span class="plain"> = </span><span class="constant">0</span><span class="plain">;</span>
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<span class="identifier">Global</span><span class="plain"> </span><span class="identifier">debug_rule_nesting</span><span class="plain">;</span>
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<span class="identifier">Global</span><span class="plain"> </span><span class="identifier">reason_the_action_failed</span><span class="plain">; </span><span class="comment">= I7 "reason the action failed"</span>
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<span class="identifier">Global</span><span class="plain"> </span><span class="identifier">indef_mode</span><span class="plain">; </span><span class="comment">"Indefinite" mode - ie, "take a brick"</span>
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<span class="comment">is in this mode</span>
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<span class="comment">[3]</span>
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<span class="identifier">Global</span><span class="plain"> </span><span class="identifier">standard_interpreter</span><span class="plain"> = </span><span class="constant">0</span><span class="plain">;</span>
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<span class="reserved">Array</span><span class="plain"> </span><span class="identifier">LocalParking</span><span class="plain"> --> </span><span class="constant">64</span><span class="plain">;</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="inwebparagraph"><a id="SP2"></a><b>§2. Language of Play. </b>The equivalent of I6's language definition file, though here the idea is
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that a translation should have an inclusion to replace the "Language.i6t"
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segment, which contains the English definition.
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</p>
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<pre class="display">
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<span class="identifier">Default</span><span class="plain"> </span><span class="identifier">LanguageCases</span><span class="plain"> </span><span class="constant">1</span><span class="plain">;</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="inwebparagraph"><a id="SP3"></a><b>§3. VM-Specific Code. </b>These sections of code contain different definitions of the same routines,
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and in some cases the same arrays, to handle low-level functions in the
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virtual machine — saving the game, performing UNDO, parsing typed text into
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dictionary word addresses and so on.
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</p>
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<pre class="display">
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</pre>
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<p class="inwebparagraph"></p>
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<p class="inwebparagraph"><a id="SP4"></a><b>§4. More. </b></p>
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<pre class="display">
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<span class="reserved">Array</span><span class="plain"> </span><span class="identifier">Protect_I7_Arrays</span><span class="plain"> --> </span><span class="constant">16339</span><span class="plain"> </span><span class="constant">12345</span><span class="plain">;</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="inwebparagraph"><a id="SP5"></a><b>§5. Print Decimal Number. </b><code class="display"><span class="extract">DecimalNumber</span></code> is a trivial function which just prints a number, in decimal
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digits. It is left over from the I6 library's support routines for Glulx,
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where it was intended as a stub to pass to the Glulx <code class="display"><span class="extract">Glulx_PrintAnything</span></code> routine
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(which I7 does not use). In I7, however, it's also used as the default
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printing routine for new kinds of value.
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</p>
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<pre class="display">
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<span class="plain">[ </span><span class="identifier">DecimalNumber</span><span class="plain"> </span><span class="identifier">num</span><span class="plain">; </span><span class="reserved">print</span><span class="plain"> </span><span class="identifier">num</span><span class="plain">; ];</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="inwebparagraph"><a id="SP6"></a><b>§6. Print Text. </b>The routine for printing an I7 "text" value, which might be text with or
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without substitutions.
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</p>
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<pre class="display">
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<span class="plain">[ </span><span class="identifier">PrintI6Text</span><span class="plain"> </span><span class="identifier">x</span><span class="plain">;</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">x</span><span class="plain"> </span><span class="reserved">ofclass</span><span class="plain"> </span><span class="identifier">String</span><span class="plain">) </span><span class="reserved">print</span><span class="plain"> (</span><span class="reserved">string</span><span class="plain">) </span><span class="identifier">x</span><span class="plain">;</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">x</span><span class="plain"> </span><span class="reserved">ofclass</span><span class="plain"> </span><span class="identifier">Routine</span><span class="plain">) </span><span class="reserved">return</span><span class="plain"> (</span><span class="identifier">x</span><span class="plain">)();</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">x</span><span class="plain"> == </span><span class="identifier">EMPTY_TEXT_PACKED</span><span class="plain">) </span><span class="reserved">rfalse</span><span class="plain">;</span>
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<span class="reserved">rtrue</span><span class="plain">;</span>
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<span class="plain">];</span>
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<span class="plain">[ </span><span class="identifier">I7_String</span><span class="plain"> </span><span class="identifier">x</span><span class="plain">; </span><span class="identifier">TEXT_TY_Say</span><span class="plain">(</span><span class="identifier">x</span><span class="plain">); ]; </span><span class="comment">An alternative name now used only by extensions</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="inwebparagraph"><a id="SP7"></a><b>§7. Properties. </b>Some either/or properties are compiled to I6 attributes, which must be
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predeclared, so we do that first. (All other properties can simply be
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used without declaration.)
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</p>
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<p class="inwebparagraph">What then follows is a table of property metadata: in particular, specifying
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which properties can be used with which I6 classes or objects. Policing
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this at run-time costs a little speed, but traps many errors of programming,
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and keeps everything typesafe. It is the price we pay for the relatively
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lenient compile-time checking of I7's "object" kind of value. To make
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it as efficient as possible, we calculate offsets into the metadata: this
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has to be done (once) at run-time, with the routine compiled.
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</p>
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<pre class="display">
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<span class="reserved">Constant</span><span class="plain"> </span><span class="identifier">attributed_property_offsets_SIZE</span><span class="plain"> </span><span class="constant">48</span><span class="plain">;</span>
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<span class="reserved">Array</span><span class="plain"> </span><span class="identifier">attributed_property_offsets</span><span class="plain"> --> </span><span class="identifier">attributed_property_offsets_SIZE</span><span class="plain">;</span>
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<span class="reserved">Constant</span><span class="plain"> </span><span class="identifier">valued_property_offsets_SIZE</span><span class="plain"> (100 + </span><span class="identifier">CCOUNT_PROPERTY</span><span class="plain"> + </span><span class="identifier">INDIV_PROP_START</span><span class="plain">-48);</span>
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<span class="reserved">Array</span><span class="plain"> </span><span class="identifier">valued_property_offsets</span><span class="plain"> --> </span><span class="identifier">valued_property_offsets_SIZE</span><span class="plain">;</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="inwebparagraph"><a id="SP8"></a><b>§8. Print Or Run. </b>This utility remains from the old I6 library: it essentially treats a
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property as textual and prints it where possible. Where the <code class="display"><span class="extract">no_break</span></code>
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flag is set, we expect the text to form only a small part of a paragraph,
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and it's inappropriate to break here: for instance, for printing the
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"printed name" of an object. Where the flag is clear, however, the text
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is expected to form its own paragraph.
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</p>
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<p class="inwebparagraph">Where <code class="display"><span class="extract">PrintOrRun</span></code> is used in breaking mode, which is only for a very few
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properties in I7 (indeed at present only <code class="display"><span class="extract">initial</span></code> and <code class="display"><span class="extract">description</span></code>),
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the routine called is given the chance to decide whether to print or not.
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It should return <code class="display"><span class="extract">true</span></code> or <code class="display"><span class="extract">false</span></code> according to whether it did so; this
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allows us to divide the paragraph or not accordingly.
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</p>
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<pre class="display">
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<span class="plain">[ </span><span class="identifier">PrintOrRun</span><span class="plain"> </span><span class="identifier">obj</span><span class="plain"> </span><span class="identifier">prop</span><span class="plain"> </span><span class="identifier">no_break</span><span class="plain"> </span><span class="identifier">pv</span><span class="plain"> </span><span class="identifier">st</span><span class="plain"> </span><span class="identifier">routine_return_value</span><span class="plain">;</span>
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<span class="plain">@</span><span class="identifier">push</span><span class="plain"> </span><span class="identifier">self</span><span class="plain">; </span><span class="identifier">self</span><span class="plain"> = </span><span class="identifier">obj</span><span class="plain">;</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">prop</span><span class="plain"> == </span><span class="constant">0</span><span class="plain">) {</span>
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<span class="reserved">print</span><span class="plain"> (</span><span class="identifier">name</span><span class="plain">) </span><span class="identifier">prop</span><span class="plain">; </span><span class="identifier">routine_return_value</span><span class="plain"> = </span><span class="reserved">true</span><span class="plain">;</span>
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<span class="plain">} </span><span class="reserved">else</span><span class="plain"> {</span>
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<span class="identifier">routine_return_value</span><span class="plain"> = </span><span class="identifier">TEXT_TY_Say</span><span class="plain">(</span><span class="identifier">obj</span><span class="plain">.</span><span class="identifier">prop</span><span class="plain">);</span>
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<span class="plain">}</span>
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<span class="plain">@</span><span class="identifier">pull</span><span class="plain"> </span><span class="identifier">self</span><span class="plain">;</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">routine_return_value</span><span class="plain">) {</span>
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<span class="identifier">say__p</span><span class="plain"> = </span><span class="constant">1</span><span class="plain">;</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">no_break</span><span class="plain"> == </span><span class="reserved">false</span><span class="plain">) {</span>
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<span class="reserved">new_line</span><span class="plain">;</span>
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<span class="identifier">DivideParagraphPoint</span><span class="plain">();</span>
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<span class="plain">}</span>
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<span class="plain">}</span>
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<span class="reserved">return</span><span class="plain"> </span><span class="identifier">routine_return_value</span><span class="plain">;</span>
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<span class="plain">];</span>
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<span class="plain">[ </span><span class="identifier">DA_Number</span><span class="plain"> </span><span class="identifier">n</span><span class="plain">; </span><span class="reserved">print</span><span class="plain"> </span><span class="identifier">n</span><span class="plain">; ];</span>
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<span class="plain">[ </span><span class="identifier">DA_TruthState</span><span class="plain"> </span><span class="identifier">n</span><span class="plain">; </span><span class="reserved">if</span><span class="plain"> (</span><span class="identifier">n</span><span class="plain">==0) </span><span class="reserved">print</span><span class="plain"> </span><span class="string">"false"</span><span class="plain">; </span><span class="reserved">else</span><span class="plain"> </span><span class="reserved">print</span><span class="plain"> </span><span class="string">"true"</span><span class="plain">; ];</span>
|
|
</pre>
|
|
|
|
<p class="inwebparagraph"></p>
|
|
|
|
<p class="inwebparagraph"><a id="SP9"></a><b>§9. Saying Phrases. </b></p>
|
|
|
|
<pre class="display">
|
|
<span class="plain">[ </span><span class="identifier">SayPhraseName</span><span class="plain"> </span><span class="identifier">closure</span><span class="plain">;</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">closure</span><span class="plain"> == </span><span class="constant">0</span><span class="plain">) </span><span class="reserved">print</span><span class="plain"> </span><span class="string">"nothing"</span><span class="plain">;</span>
|
|
<span class="reserved">else</span><span class="plain"> </span><span class="reserved">print</span><span class="plain"> (</span><span class="reserved">string</span><span class="plain">) </span><span class="identifier">closure</span><span class="plain">-->2;</span>
|
|
<span class="plain">];</span>
|
|
</pre>
|
|
|
|
<p class="inwebparagraph"></p>
|
|
|
|
<p class="inwebparagraph"><a id="SP10"></a><b>§10. Kinds. </b></p>
|
|
|
|
<pre class="display">
|
|
<span class="plain">[ </span><span class="identifier">KindAtomic</span><span class="plain"> </span><span class="identifier">kind</span><span class="plain">;</span>
|
|
<span class="reserved">if</span><span class="plain"> ((</span><span class="identifier">kind</span><span class="plain"> >= </span><span class="constant">0</span><span class="plain">) && (</span><span class="identifier">kind</span><span class="plain"> < </span><span class="identifier">BASE_KIND_HWM</span><span class="plain">)) </span><span class="reserved">return</span><span class="plain"> </span><span class="identifier">kind</span><span class="plain">;</span>
|
|
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">kind</span><span class="plain">-->0;</span>
|
|
<span class="plain">];</span>
|
|
|
|
<span class="plain">[ </span><span class="identifier">KindBaseArity</span><span class="plain"> </span><span class="identifier">kind</span><span class="plain">;</span>
|
|
<span class="reserved">if</span><span class="plain"> ((</span><span class="identifier">kind</span><span class="plain"> >= </span><span class="constant">0</span><span class="plain">) && (</span><span class="identifier">kind</span><span class="plain"> < </span><span class="identifier">BASE_KIND_HWM</span><span class="plain">)) </span><span class="reserved">return</span><span class="plain"> </span><span class="constant">0</span><span class="plain">;</span>
|
|
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">kind</span><span class="plain">-->1;</span>
|
|
<span class="plain">];</span>
|
|
|
|
<span class="plain">[ </span><span class="identifier">KindBaseTerm</span><span class="plain"> </span><span class="identifier">kind</span><span class="plain"> </span><span class="identifier">n</span><span class="plain">;</span>
|
|
<span class="reserved">if</span><span class="plain"> ((</span><span class="identifier">kind</span><span class="plain"> >= </span><span class="constant">0</span><span class="plain">) && (</span><span class="identifier">kind</span><span class="plain"> < </span><span class="identifier">BASE_KIND_HWM</span><span class="plain">)) </span><span class="reserved">return</span><span class="plain"> </span><span class="identifier">UNKNOWN_TY</span><span class="plain">;</span>
|
|
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">kind</span><span class="plain">-->(2+</span><span class="identifier">n</span><span class="plain">);</span>
|
|
<span class="plain">];</span>
|
|
</pre>
|
|
|
|
<p class="inwebparagraph"></p>
|
|
|
|
<p class="inwebparagraph"><a id="SP11"></a><b>§11. GenerateRandomNumber. </b>The following uses the virtual machine's RNG (via the I6 built-in function
|
|
<code class="display"><span class="extract">random</span></code>) to produce a uniformly random integer in the range n to m
|
|
inclusive, where n and m are allowed to be either way around; so that
|
|
a random number between 17 and 4 is the same thing as a random number
|
|
between 4 and 17, and there is therefore no pair of n and m corresponding
|
|
to an empty range of values.
|
|
</p>
|
|
|
|
<pre class="display">
|
|
<span class="plain">[ </span><span class="identifier">GenerateRandomNumber</span><span class="plain"> </span><span class="identifier">n</span><span class="plain"> </span><span class="identifier">m</span><span class="plain"> </span><span class="identifier">s</span><span class="plain">;</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">n</span><span class="plain">==</span><span class="identifier">m</span><span class="plain">) </span><span class="reserved">return</span><span class="plain"> </span><span class="identifier">n</span><span class="plain">;</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">n</span><span class="plain">></span><span class="identifier">m</span><span class="plain">) { </span><span class="identifier">s</span><span class="plain"> = </span><span class="identifier">n</span><span class="plain">; </span><span class="identifier">n</span><span class="plain"> = </span><span class="identifier">m</span><span class="plain">; </span><span class="identifier">m</span><span class="plain"> = </span><span class="identifier">s</span><span class="plain">; }</span>
|
|
<span class="identifier">n</span><span class="plain">--;</span>
|
|
<span class="reserved">return</span><span class="plain"> </span><span class="reserved">random</span><span class="plain">(</span><span class="identifier">m</span><span class="plain">-</span><span class="identifier">n</span><span class="plain">) + </span><span class="identifier">n</span><span class="plain">;</span>
|
|
<span class="plain">];</span>
|
|
<span class="reserved">Constant</span><span class="plain"> </span><span class="identifier">R_DecimalNumber</span><span class="plain"> = </span><span class="identifier">GenerateRandomNumber</span><span class="plain">;</span>
|
|
<span class="reserved">Constant</span><span class="plain"> </span><span class="identifier">R_PrintTimeOfDay</span><span class="plain"> = </span><span class="identifier">GenerateRandomNumber</span><span class="plain">;</span>
|
|
</pre>
|
|
|
|
<p class="inwebparagraph"></p>
|
|
|
|
<p class="inwebparagraph"><a id="SP12"></a><b>§12. PrintSpaces. </b>Which prints a row of n spaces, for n>= 0.
|
|
</p>
|
|
|
|
<pre class="display">
|
|
<span class="plain">[ </span><span class="identifier">PrintSpaces</span><span class="plain"> </span><span class="identifier">n</span><span class="plain">;</span>
|
|
<span class="reserved">while</span><span class="plain"> (</span><span class="identifier">n</span><span class="plain"> > </span><span class="constant">0</span><span class="plain">) {</span>
|
|
<span class="reserved">print</span><span class="plain"> </span><span class="string">" "</span><span class="plain">;</span>
|
|
<span class="identifier">n</span><span class="plain"> = </span><span class="identifier">n</span><span class="plain"> - </span><span class="constant">1</span><span class="plain">;</span>
|
|
<span class="plain">}</span>
|
|
<span class="plain">];</span>
|
|
</pre>
|
|
|
|
<p class="inwebparagraph"></p>
|
|
|
|
<p class="inwebparagraph"><a id="SP13"></a><b>§13. SwapWorkflags. </b>Recall that we have two general-purpose temporary attributes for each object:
|
|
<code class="display"><span class="extract">workflag</span></code> and <code class="display"><span class="extract">workflag2</span></code>. The following swaps their values over for every
|
|
object at once.
|
|
</p>
|
|
|
|
<pre class="display">
|
|
<span class="plain">[ </span><span class="identifier">SwapWorkflags</span><span class="plain"> </span><span class="identifier">obj</span><span class="plain"> </span><span class="identifier">lst</span><span class="plain">;</span>
|
|
<span class="reserved">objectloop</span><span class="plain"> (</span><span class="identifier">obj</span><span class="plain"> </span><span class="reserved">ofclass</span><span class="plain"> </span><span class="identifier">Object</span><span class="plain">) {</span>
|
|
<span class="identifier">lst</span><span class="plain"> = </span><span class="reserved">false</span><span class="plain">;</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">obj</span><span class="plain"> </span><span class="reserved">has</span><span class="plain"> </span><span class="identifier">workflag2</span><span class="plain">) </span><span class="identifier">lst</span><span class="plain"> = </span><span class="reserved">true</span><span class="plain">;</span>
|
|
<span class="reserved">give</span><span class="plain"> </span><span class="identifier">obj</span><span class="plain"> ~</span><span class="identifier">workflag2</span><span class="plain">;</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">obj</span><span class="plain"> </span><span class="reserved">has</span><span class="plain"> </span><span class="identifier">workflag</span><span class="plain">) </span><span class="reserved">give</span><span class="plain"> </span><span class="identifier">obj</span><span class="plain"> </span><span class="identifier">workflag2</span><span class="plain">;</span>
|
|
<span class="reserved">give</span><span class="plain"> </span><span class="identifier">obj</span><span class="plain"> ~</span><span class="identifier">workflag</span><span class="plain">;</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">lst</span><span class="plain">) </span><span class="reserved">give</span><span class="plain"> </span><span class="identifier">obj</span><span class="plain"> </span><span class="identifier">workflag</span><span class="plain">;</span>
|
|
<span class="plain">}</span>
|
|
<span class="plain">];</span>
|
|
</pre>
|
|
|
|
<p class="inwebparagraph"></p>
|
|
|
|
<p class="inwebparagraph"><a id="SP14"></a><b>§14. TestUseOption. </b>This routine, compiled by NI, returns <code class="display"><span class="extract">true</span></code> if the supplied argument is the
|
|
number of a use option in force for the current run of NI, and <code class="display"><span class="extract">false</span></code>
|
|
otherwise.
|
|
</p>
|
|
|
|
<p class="inwebparagraph"><a id="SP15"></a><b>§15. ZRegion. </b>I7 contains many relics from I6, but here's a relic from I5: a routine which
|
|
used to determine the metaclass of a value, before that concept was given a
|
|
name. In I6 code, it can be implemented simply using <code class="display"><span class="extract">metaclass</span></code>, as the
|
|
following shows. (The name is from "region of the Z-machine".)
|
|
</p>
|
|
|
|
<pre class="display">
|
|
<span class="plain">[ </span><span class="identifier">ZRegion</span><span class="plain"> </span><span class="identifier">addr</span><span class="plain">;</span>
|
|
<span class="reserved">switch</span><span class="plain"> (</span><span class="reserved">metaclass</span><span class="plain">(</span><span class="identifier">addr</span><span class="plain">)) {</span>
|
|
<span class="reserved">nothing</span><span class="plain">: </span><span class="reserved">return</span><span class="plain"> </span><span class="constant">0</span><span class="plain">;</span>
|
|
<span class="identifier">Object</span><span class="plain">, </span><span class="identifier">Class</span><span class="plain">: </span><span class="reserved">return</span><span class="plain"> </span><span class="constant">1</span><span class="plain">;</span>
|
|
<span class="identifier">Routine</span><span class="plain">: </span><span class="reserved">return</span><span class="plain"> </span><span class="constant">2</span><span class="plain">;</span>
|
|
<span class="identifier">String</span><span class="plain">: </span><span class="reserved">return</span><span class="plain"> </span><span class="constant">3</span><span class="plain">;</span>
|
|
<span class="plain">}</span>
|
|
<span class="plain">];</span>
|
|
</pre>
|
|
|
|
<p class="inwebparagraph"></p>
|
|
|
|
<p class="inwebparagraph"><a id="SP16"></a><b>§16. Memcpy. </b>This is equivalent to C's memcpy function, in good ways and bad.
|
|
</p>
|
|
|
|
<pre class="display">
|
|
<span class="plain">[ </span><span class="identifier">Memcpy</span><span class="plain"> </span><span class="identifier">to_addr</span><span class="plain"> </span><span class="identifier">from_addr</span><span class="plain"> </span><span class="identifier">size</span><span class="plain"> </span><span class="identifier">n</span><span class="plain">;</span>
|
|
<span class="plain">#</span><span class="identifier">Ifdef</span><span class="plain"> </span><span class="identifier">TARGET_ZCODE</span><span class="plain">;</span>
|
|
<span class="reserved">for</span><span class="plain"> (</span><span class="identifier">n</span><span class="plain"> = </span><span class="identifier">size</span><span class="plain">/</span><span class="identifier">WORDSIZE</span><span class="plain">: (</span><span class="identifier">n</span><span class="plain">--) > </span><span class="constant">0</span><span class="plain">: ) </span><span class="identifier">to_addr</span><span class="plain">--></span><span class="identifier">n</span><span class="plain"> = </span><span class="identifier">from_addr</span><span class="plain">--></span><span class="identifier">n</span><span class="plain">;</span>
|
|
<span class="reserved">for</span><span class="plain"> (</span><span class="identifier">n</span><span class="plain"> = </span><span class="identifier">size</span><span class="plain">: ((</span><span class="identifier">n</span><span class="plain">--) % </span><span class="identifier">WORDSIZE</span><span class="plain"> ~= </span><span class="constant">0</span><span class="plain">): ) </span><span class="identifier">to_addr</span><span class="plain">-></span><span class="identifier">n</span><span class="plain"> = </span><span class="identifier">from_addr</span><span class="plain">-></span><span class="identifier">n</span><span class="plain">;</span>
|
|
<span class="plain">#</span><span class="identifier">Ifnot</span><span class="plain">; </span><span class="comment">TARGET_GLULX</span>
|
|
<span class="plain">@</span><span class="identifier">mcopy</span><span class="plain"> </span><span class="identifier">size</span><span class="plain"> </span><span class="identifier">from_addr</span><span class="plain"> </span><span class="identifier">to_addr</span><span class="plain">;</span>
|
|
<span class="plain">#</span><span class="identifier">Endif</span><span class="plain">; </span><span class="comment">TARGET_</span>
|
|
<span class="plain">];</span>
|
|
</pre>
|
|
|
|
<p class="inwebparagraph"></p>
|
|
|
|
<p class="inwebparagraph"><a id="SP17"></a><b>§17. Arrcpy. </b>This is not quite so efficient, but not terrible.
|
|
</p>
|
|
|
|
<pre class="display">
|
|
<span class="plain">[ </span><span class="identifier">Arrcpy</span><span class="plain"> </span><span class="identifier">to_array</span><span class="plain"> </span><span class="identifier">to_entry_size</span><span class="plain"> </span><span class="identifier">from_array</span><span class="plain"> </span><span class="identifier">from_entry_size</span><span class="plain"> </span><span class="identifier">no_entries</span><span class="plain"> </span><span class="identifier">n</span><span class="plain"> </span><span class="identifier">val</span><span class="plain">;</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">to_entry_size</span><span class="plain"> == </span><span class="identifier">from_entry_size</span><span class="plain">)</span>
|
|
<span class="identifier">Memcpy</span><span class="plain">(</span><span class="identifier">to_array</span><span class="plain">, </span><span class="identifier">from_array</span><span class="plain">, </span><span class="identifier">to_entry_size</span><span class="plain">*</span><span class="identifier">no_entries</span><span class="plain">);</span>
|
|
<span class="reserved">else</span><span class="plain"> </span><span class="reserved">if</span><span class="plain"> ((</span><span class="identifier">to_entry_size</span><span class="plain"> == </span><span class="constant">2</span><span class="plain">) && (</span><span class="identifier">from_entry_size</span><span class="plain"> == </span><span class="constant">4</span><span class="plain">)) {</span>
|
|
<span class="reserved">for</span><span class="plain"> (</span><span class="identifier">n</span><span class="plain"> = </span><span class="constant">0</span><span class="plain">: </span><span class="identifier">n</span><span class="plain"><</span><span class="identifier">no_entries</span><span class="plain">: </span><span class="identifier">n</span><span class="plain">++) {</span>
|
|
<span class="identifier">val</span><span class="plain"> = </span><span class="identifier">from_array</span><span class="plain">--></span><span class="identifier">n</span><span class="plain">;</span>
|
|
<span class="identifier">to_array</span><span class="plain">->0 = (</span><span class="identifier">val</span><span class="plain">/256)%256; </span><span class="identifier">to_array</span><span class="plain">->1 = </span><span class="identifier">val</span><span class="plain">%256;</span>
|
|
<span class="identifier">to_array</span><span class="plain"> = </span><span class="identifier">to_array</span><span class="plain"> + </span><span class="constant">2</span><span class="plain">;</span>
|
|
<span class="plain">}</span>
|
|
<span class="plain">} </span><span class="reserved">else</span><span class="plain"> </span><span class="string">"*** Arrcpy doesn't support this ***"</span><span class="plain">;</span>
|
|
<span class="plain">];</span>
|
|
</pre>
|
|
|
|
<p class="inwebparagraph"></p>
|
|
|
|
<p class="inwebparagraph"><a id="SP18"></a><b>§18. Verbs as Values. </b></p>
|
|
|
|
<pre class="display">
|
|
<span class="plain">[ </span><span class="identifier">PrintVerbAsValue</span><span class="plain"> </span><span class="identifier">vb</span><span class="plain">;</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">vb</span><span class="plain"> == </span><span class="constant">0</span><span class="plain">) </span><span class="reserved">print</span><span class="plain"> </span><span class="string">"(no verb)"</span><span class="plain">;</span>
|
|
<span class="reserved">else</span><span class="plain"> { </span><span class="reserved">print</span><span class="plain"> </span><span class="string">"verb "</span><span class="plain">; </span><span class="identifier">vb</span><span class="plain">(1); }</span>
|
|
<span class="plain">];</span>
|
|
|
|
<span class="plain">[ </span><span class="identifier">VerbIsMeaningful</span><span class="plain"> </span><span class="identifier">vb</span><span class="plain">;</span>
|
|
<span class="reserved">if</span><span class="plain"> ((</span><span class="identifier">vb</span><span class="plain">) && (</span><span class="identifier">BlkValueCompare</span><span class="plain">(</span><span class="identifier">vb</span><span class="plain">(</span><span class="identifier">CV_MEANING</span><span class="plain">), </span><span class="identifier">MEANINGLESS_RR</span><span class="plain">) ~= </span><span class="constant">0</span><span class="plain">)) </span><span class="reserved">rtrue</span><span class="plain">;</span>
|
|
<span class="reserved">rfalse</span><span class="plain">;</span>
|
|
<span class="plain">];</span>
|
|
|
|
<span class="plain">[ </span><span class="identifier">VerbIsModal</span><span class="plain"> </span><span class="identifier">vb</span><span class="plain">;</span>
|
|
<span class="reserved">if</span><span class="plain"> ((</span><span class="identifier">vb</span><span class="plain">) && (</span><span class="identifier">vb</span><span class="plain">(</span><span class="identifier">CV_MODAL</span><span class="plain">))) </span><span class="reserved">rtrue</span><span class="plain">;</span>
|
|
<span class="reserved">rfalse</span><span class="plain">;</span>
|
|
<span class="plain">];</span>
|
|
</pre>
|
|
|
|
<p class="inwebparagraph"></p>
|
|
|
|
<p class="inwebparagraph"><a id="SP19"></a><b>§19. Seed Random Number Generator Rule. </b>Unless a seed is provided by NI, and it won't be for released story files,
|
|
the VM's interpreter is supposed to start up with a good seed in its random
|
|
number generator: something usually derived from, say, the milliseconds part
|
|
of the current time of day, which is unlikely to repeat or show any pattern
|
|
in real-world use. However, early Z-machine interpreters often did this quite
|
|
badly, starting with poor seed values which meant that the first few random
|
|
numbers always had something in common (being fairly small in their range,
|
|
for instance). To obviate this we extract and throw away 100 random numbers
|
|
to get the generator going, shaking out more obvious early patterns, but
|
|
that cannot really help much if the VM interpreter's RNG is badly written.
|
|
"Anyone who considers arithmetical methods of producing random digits is,
|
|
of course, in a state of sin" (von Neumann).
|
|
</p>
|
|
|
|
<pre class="display">
|
|
<span class="plain">[ </span><span class="identifier">SEED_RANDOM_NUMBER_GENERATOR_R</span><span class="plain"> </span><span class="identifier">i</span><span class="plain">;</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">RNG_SEED_AT_START_OF_PLAY</span><span class="plain">) </span><span class="identifier">VM_Seed_RNG</span><span class="plain">(</span><span class="identifier">RNG_SEED_AT_START_OF_PLAY</span><span class="plain">);</span>
|
|
<span class="reserved">for</span><span class="plain"> (</span><span class="identifier">i</span><span class="plain">=1: </span><span class="identifier">i</span><span class="plain"><=100: </span><span class="identifier">i</span><span class="plain">++) </span><span class="reserved">random</span><span class="plain">(</span><span class="identifier">i</span><span class="plain">);</span>
|
|
<span class="reserved">rfalse</span><span class="plain">;</span>
|
|
<span class="plain">];</span>
|
|
</pre>
|
|
|
|
<p class="inwebparagraph"></p>
|
|
|
|
<p class="inwebparagraph"><a id="SP20"></a><b>§20. Extracting Verb Numbers. </b>A long tale of woe lies behind the following. Infocom games stored verb numbers
|
|
in a single byte in dictionary entries, but they did so counting downwards, so
|
|
that verb number 0 was stored as 255, 1 as 254, and so on. Inform followed
|
|
suit so that debugging of Inform 1 could be aided by using the then-available
|
|
tools for dumping dictionaries from Infocom story files; by using the Infocom
|
|
format for dictionary tables, Inform's life was easier.
|
|
</p>
|
|
|
|
<p class="inwebparagraph">But there was an implicit restriction there of 255 distinct verbs (not 256
|
|
since not all words were verbs). When Glulx raised almost all of the Z-machine
|
|
limits, it made space for 65535 verbs instead of 255, but it appears that
|
|
nobody remembered to implement this in I6-for-Glulx and the Glulx form of
|
|
the I6 library. This was only put right in March 2009, and the following
|
|
routine was added to concentrate lookups of this field in one place.
|
|
</p>
|
|
|
|
<pre class="display">
|
|
<span class="plain">[ </span><span class="identifier">DictionaryWordToVerbNum</span><span class="plain"> </span><span class="identifier">dword</span><span class="plain"> </span><span class="identifier">verbnum</span><span class="plain">;</span>
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<span class="plain">#</span><span class="identifier">Ifdef</span><span class="plain"> </span><span class="identifier">TARGET_ZCODE</span><span class="plain">;</span>
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<span class="identifier">verbnum</span><span class="plain"> = </span><span class="constant">$ff</span><span class="plain">-(</span><span class="identifier">dword</span><span class="plain">->#</span><span class="identifier">dict_par2</span><span class="plain">);</span>
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<span class="plain">#</span><span class="identifier">Ifnot</span><span class="plain">; </span><span class="comment">GLULX</span>
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<span class="identifier">dword</span><span class="plain"> = </span><span class="identifier">dword</span><span class="plain"> + #</span><span class="identifier">dict_par2</span><span class="plain"> - </span><span class="constant">1</span><span class="plain">;</span>
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<span class="plain">@</span><span class="identifier">aloads</span><span class="plain"> </span><span class="identifier">dword</span><span class="plain"> </span><span class="constant">0</span><span class="plain"> </span><span class="identifier">verbnum</span><span class="plain">;</span>
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<span class="identifier">verbnum</span><span class="plain"> = </span><span class="constant">$ffff</span><span class="plain">-</span><span class="identifier">verbnum</span><span class="plain">;</span>
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<span class="plain">#</span><span class="identifier">Endif</span><span class="plain">;</span>
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<span class="reserved">return</span><span class="plain"> </span><span class="identifier">verbnum</span><span class="plain">;</span>
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<span class="plain">];</span>
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<span class="plain">[ </span><span class="identifier">RegardingSingleObject</span><span class="plain"> </span><span class="identifier">obj</span><span class="plain">;</span>
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<span class="identifier">prior_named_list</span><span class="plain"> = </span><span class="constant">1</span><span class="plain">;</span>
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<span class="identifier">prior_named_list_gender</span><span class="plain"> = -1;</span>
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<span class="identifier">prior_named_noun</span><span class="plain"> = </span><span class="identifier">obj</span><span class="plain">;</span>
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<span class="plain">];</span>
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<span class="plain">[ </span><span class="identifier">RegardingNumber</span><span class="plain"> </span><span class="identifier">n</span><span class="plain">;</span>
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<span class="identifier">prior_named_list</span><span class="plain"> = </span><span class="identifier">n</span><span class="plain">;</span>
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<span class="identifier">prior_named_list_gender</span><span class="plain"> = -1;</span>
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<span class="identifier">prior_named_noun</span><span class="plain"> = </span><span class="reserved">nothing</span><span class="plain">;</span>
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<span class="plain">];</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="inwebparagraph"><a id="SP21"></a><b>§21. Say One Of. </b>These routines are described in the Extensions chapter of the Inform
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documentation.
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</p>
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<pre class="display">
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<span class="plain">[ </span><span class="identifier">I7_SOO_PAR</span><span class="plain"> </span><span class="identifier">oldval</span><span class="plain"> </span><span class="identifier">count</span><span class="plain">; </span><span class="reserved">if</span><span class="plain"> (</span><span class="identifier">count</span><span class="plain"> <= </span><span class="constant">1</span><span class="plain">) </span><span class="reserved">return</span><span class="plain"> </span><span class="identifier">count</span><span class="plain">; </span><span class="reserved">return</span><span class="plain"> </span><span class="reserved">random</span><span class="plain">(</span><span class="identifier">count</span><span class="plain">); ];</span>
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<span class="plain">[ </span><span class="identifier">I7_SOO_RAN</span><span class="plain"> </span><span class="identifier">oldval</span><span class="plain"> </span><span class="identifier">count</span><span class="plain"> </span><span class="identifier">v</span><span class="plain">; </span><span class="reserved">if</span><span class="plain"> (</span><span class="identifier">count</span><span class="plain"> <= </span><span class="constant">1</span><span class="plain">) </span><span class="reserved">return</span><span class="plain"> </span><span class="identifier">count</span><span class="plain">;</span>
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<span class="identifier">v</span><span class="plain"> = </span><span class="identifier">oldval</span><span class="plain">; </span><span class="reserved">while</span><span class="plain"> (</span><span class="identifier">v</span><span class="plain"> == </span><span class="identifier">oldval</span><span class="plain">) </span><span class="identifier">v</span><span class="plain"> = </span><span class="reserved">random</span><span class="plain">(</span><span class="identifier">count</span><span class="plain">); </span><span class="reserved">return</span><span class="plain"> </span><span class="identifier">v</span><span class="plain">; ];</span>
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<span class="plain">[ </span><span class="identifier">I7_SOO_STI</span><span class="plain"> </span><span class="identifier">oldval</span><span class="plain"> </span><span class="identifier">count</span><span class="plain"> </span><span class="identifier">v</span><span class="plain">; </span><span class="reserved">if</span><span class="plain"> (</span><span class="identifier">oldval</span><span class="plain">) </span><span class="reserved">return</span><span class="plain"> </span><span class="identifier">oldval</span><span class="plain">; </span><span class="reserved">return</span><span class="plain"> </span><span class="identifier">I7_SOO_PAR</span><span class="plain">(</span><span class="identifier">oldval</span><span class="plain">, </span><span class="identifier">count</span><span class="plain">); ];</span>
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<span class="plain">[ </span><span class="identifier">I7_SOO_CYC</span><span class="plain"> </span><span class="identifier">oldval</span><span class="plain"> </span><span class="identifier">count</span><span class="plain">; </span><span class="identifier">oldval</span><span class="plain">++; </span><span class="reserved">if</span><span class="plain"> (</span><span class="identifier">oldval</span><span class="plain"> > </span><span class="identifier">count</span><span class="plain">) </span><span class="identifier">oldval</span><span class="plain"> = </span><span class="constant">1</span><span class="plain">; </span><span class="reserved">return</span><span class="plain"> </span><span class="identifier">oldval</span><span class="plain">; ];</span>
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<span class="plain">[ </span><span class="identifier">I7_SOO_STOP</span><span class="plain"> </span><span class="identifier">oldval</span><span class="plain"> </span><span class="identifier">count</span><span class="plain">; </span><span class="identifier">oldval</span><span class="plain">++; </span><span class="reserved">if</span><span class="plain"> (</span><span class="identifier">oldval</span><span class="plain"> > </span><span class="identifier">count</span><span class="plain">) </span><span class="identifier">oldval</span><span class="plain"> = </span><span class="identifier">count</span><span class="plain">; </span><span class="reserved">return</span><span class="plain"> </span><span class="identifier">oldval</span><span class="plain">; ];</span>
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<span class="plain">[ </span><span class="identifier">I7_SOO_TAP</span><span class="plain"> </span><span class="identifier">oldval</span><span class="plain"> </span><span class="identifier">count</span><span class="plain"> </span><span class="identifier">tn</span><span class="plain"> </span><span class="identifier">rn</span><span class="plain"> </span><span class="identifier">c</span><span class="plain">; </span><span class="reserved">if</span><span class="plain"> (</span><span class="identifier">count</span><span class="plain"> <= </span><span class="constant">1</span><span class="plain">) </span><span class="reserved">return</span><span class="plain"> </span><span class="identifier">count</span><span class="plain">; </span><span class="identifier">tn</span><span class="plain"> = </span><span class="identifier">count</span><span class="plain">*(</span><span class="identifier">count</span><span class="plain">+1)/2;</span>
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<span class="identifier">rn</span><span class="plain"> = </span><span class="reserved">random</span><span class="plain">(</span><span class="identifier">tn</span><span class="plain">); </span><span class="reserved">for</span><span class="plain"> (</span><span class="identifier">c</span><span class="plain">=1:</span><span class="identifier">c</span><span class="plain"><=</span><span class="identifier">count</span><span class="plain">:</span><span class="identifier">c</span><span class="plain">++) { </span><span class="identifier">rn</span><span class="plain"> = </span><span class="identifier">rn</span><span class="plain"> - </span><span class="identifier">c</span><span class="plain">; </span><span class="reserved">if</span><span class="plain"> (</span><span class="identifier">rn</span><span class="plain"><=0) </span><span class="reserved">return</span><span class="plain"> (</span><span class="identifier">count</span><span class="plain">-</span><span class="identifier">c</span><span class="plain">+1); } ];</span>
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<span class="plain">[ </span><span class="identifier">I7_SOO_TRAN</span><span class="plain"> </span><span class="identifier">oldval</span><span class="plain"> </span><span class="identifier">count</span><span class="plain">; </span><span class="reserved">if</span><span class="plain"> (</span><span class="identifier">oldval</span><span class="plain"><</span><span class="identifier">count</span><span class="plain">) </span><span class="reserved">return</span><span class="plain"> </span><span class="identifier">oldval</span><span class="plain">+1;</span>
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<span class="reserved">return</span><span class="plain"> </span><span class="identifier">count</span><span class="plain"> + </span><span class="constant">1</span><span class="plain"> + </span><span class="identifier">I7_SOO_RAN</span><span class="plain">(</span><span class="identifier">oldval</span><span class="plain">%(</span><span class="identifier">count</span><span class="plain">+1), </span><span class="identifier">count</span><span class="plain">); ];</span>
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<span class="plain">[ </span><span class="identifier">I7_SOO_TPAR</span><span class="plain"> </span><span class="identifier">oldval</span><span class="plain"> </span><span class="identifier">count</span><span class="plain">; </span><span class="reserved">if</span><span class="plain"> (</span><span class="identifier">oldval</span><span class="plain"><</span><span class="identifier">count</span><span class="plain">) </span><span class="reserved">return</span><span class="plain"> </span><span class="identifier">oldval</span><span class="plain">+1;</span>
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<span class="reserved">return</span><span class="plain"> </span><span class="identifier">count</span><span class="plain"> + </span><span class="constant">1</span><span class="plain"> + </span><span class="identifier">I7_SOO_PAR</span><span class="plain">(</span><span class="identifier">oldval</span><span class="plain">%(</span><span class="identifier">count</span><span class="plain">+1), </span><span class="identifier">count</span><span class="plain">); ];</span>
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<span class="reserved">Array</span><span class="plain"> </span><span class="identifier">I7_SOO_SHUF</span><span class="plain">->32;</span>
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<span class="plain">[ </span><span class="identifier">I7_SOO_SHU</span><span class="plain"> </span><span class="identifier">oldval</span><span class="plain"> </span><span class="identifier">count</span><span class="plain"> </span><span class="identifier">sd</span><span class="plain"> </span><span class="identifier">ct</span><span class="plain"> </span><span class="identifier">v</span><span class="plain"> </span><span class="identifier">i</span><span class="plain"> </span><span class="identifier">j</span><span class="plain"> </span><span class="identifier">s</span><span class="plain"> </span><span class="identifier">ssd</span><span class="plain"> </span><span class="identifier">scope</span><span class="plain"> </span><span class="identifier">cc</span><span class="plain"> </span><span class="identifier">base</span><span class="plain">;</span>
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<span class="identifier">base</span><span class="plain"> = </span><span class="identifier">count</span><span class="plain">+1;</span>
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<span class="identifier">v</span><span class="plain"> = </span><span class="identifier">oldval</span><span class="plain">%</span><span class="identifier">base</span><span class="plain">; </span><span class="identifier">oldval</span><span class="plain"> = </span><span class="identifier">oldval</span><span class="plain">/</span><span class="identifier">base</span><span class="plain">; </span><span class="identifier">ct</span><span class="plain"> = </span><span class="identifier">oldval</span><span class="plain">%</span><span class="identifier">base</span><span class="plain">; </span><span class="identifier">sd</span><span class="plain"> = </span><span class="identifier">oldval</span><span class="plain">/</span><span class="identifier">base</span><span class="plain">;</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">count</span><span class="plain"> > </span><span class="constant">32</span><span class="plain">) </span><span class="reserved">return</span><span class="plain"> </span><span class="identifier">I7_SOO_PAR</span><span class="plain">(</span><span class="identifier">oldval</span><span class="plain">, </span><span class="identifier">count</span><span class="plain">);</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">count</span><span class="plain"> <= </span><span class="constant">1</span><span class="plain">) </span><span class="identifier">v</span><span class="plain"> = </span><span class="identifier">count</span><span class="plain">;</span>
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<span class="reserved">else</span><span class="plain"> {</span>
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<span class="comment">rint "^In v=", v, " ct=", ct, " sd=", sd, "^";</span>
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<span class="identifier">cc</span><span class="plain"> = </span><span class="identifier">base</span><span class="plain">*</span><span class="identifier">base</span><span class="plain">;</span>
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<span class="identifier">scope</span><span class="plain"> = (</span><span class="identifier">MAX_POSITIVE_NUMBER</span><span class="plain">-1)/</span><span class="identifier">cc</span><span class="plain">;</span>
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<span class="comment">rint "Scope = ", scope, "^";</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">sd</span><span class="plain"> == </span><span class="constant">0</span><span class="plain">) { </span><span class="identifier">sd</span><span class="plain"> = </span><span class="reserved">random</span><span class="plain">(</span><span class="identifier">scope</span><span class="plain">); </span><span class="identifier">ct</span><span class="plain">=0; }</span>
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<span class="reserved">for</span><span class="plain"> (</span><span class="identifier">i</span><span class="plain">=0:</span><span class="identifier">i</span><span class="plain"><</span><span class="identifier">count</span><span class="plain">:</span><span class="identifier">i</span><span class="plain">++) </span><span class="identifier">I7_SOO_SHUF</span><span class="plain">-></span><span class="identifier">i</span><span class="plain"> = </span><span class="identifier">i</span><span class="plain">;</span>
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<span class="identifier">ssd</span><span class="plain"> = </span><span class="identifier">sd</span><span class="plain">;</span>
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<span class="reserved">for</span><span class="plain"> (</span><span class="identifier">i</span><span class="plain">=0:</span><span class="identifier">i</span><span class="plain"><</span><span class="identifier">count</span><span class="plain">-1:</span><span class="identifier">i</span><span class="plain">++) {</span>
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<span class="identifier">j</span><span class="plain"> = (</span><span class="identifier">sd</span><span class="plain">)%(</span><span class="identifier">count</span><span class="plain">-</span><span class="identifier">i</span><span class="plain">)+</span><span class="identifier">i</span><span class="plain">; </span><span class="identifier">sd</span><span class="plain"> = (</span><span class="identifier">sd</span><span class="plain">*31973)+17; </span><span class="reserved">if</span><span class="plain"> (</span><span class="identifier">sd</span><span class="plain"><0) </span><span class="identifier">sd</span><span class="plain">=-</span><span class="identifier">sd</span><span class="plain">;</span>
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<span class="identifier">s</span><span class="plain"> = </span><span class="identifier">I7_SOO_SHUF</span><span class="plain">-></span><span class="identifier">j</span><span class="plain">; </span><span class="identifier">I7_SOO_SHUF</span><span class="plain">-></span><span class="identifier">j</span><span class="plain"> = </span><span class="identifier">I7_SOO_SHUF</span><span class="plain">-></span><span class="identifier">i</span><span class="plain">; </span><span class="identifier">I7_SOO_SHUF</span><span class="plain">-></span><span class="identifier">i</span><span class="plain"> = </span><span class="identifier">s</span><span class="plain">;</span>
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<span class="plain">}</span>
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<span class="comment">or (i=0:i<count:i++) print I7_SOO_SHUF->i, " "; print "^";</span>
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<span class="identifier">v</span><span class="plain"> = (</span><span class="identifier">I7_SOO_SHUF</span><span class="plain">-></span><span class="identifier">ct</span><span class="plain">)+1;</span>
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<span class="identifier">ct</span><span class="plain">++; </span><span class="reserved">if</span><span class="plain"> (</span><span class="identifier">ct</span><span class="plain"> >= </span><span class="identifier">count</span><span class="plain">) { </span><span class="identifier">ct</span><span class="plain"> = </span><span class="constant">0</span><span class="plain">; </span><span class="identifier">ssd</span><span class="plain"> = </span><span class="constant">0</span><span class="plain">; }</span>
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<span class="plain">}</span>
|
|
<span class="comment">rint "Out v=", v, " ct=", ct, " ssd=", sd, "^";</span>
|
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<span class="comment">rint "Return ", v + ct*base + ssd*base*base, "^";</span>
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<span class="reserved">return</span><span class="plain"> </span><span class="identifier">v</span><span class="plain"> + </span><span class="identifier">ct</span><span class="plain">*</span><span class="identifier">base</span><span class="plain"> + </span><span class="identifier">ssd</span><span class="plain">*</span><span class="identifier">base</span><span class="plain">*</span><span class="identifier">base</span><span class="plain">;</span>
|
|
<span class="plain">];</span>
|
|
</pre>
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<p class="inwebparagraph"></p>
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<p class="inwebparagraph"><a id="SP22"></a><b>§22. Rounding. </b>The following rounds a numerical value <code class="display"><span class="extract">t1</span></code> to the nearest unit of <code class="display"><span class="extract">t2</span></code>;
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for instance, if <code class="display"><span class="extract">t2</span></code> is 5 then it rounds to the nearest 5. The name is an
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anachronism, as it's used for all kinds of value.
|
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</p>
|
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<pre class="display">
|
|
<span class="plain">[ </span><span class="identifier">RoundOffValue</span><span class="plain"> </span><span class="identifier">t1</span><span class="plain"> </span><span class="identifier">t2</span><span class="plain">;</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">t1</span><span class="plain"> >= </span><span class="constant">0</span><span class="plain">) </span><span class="reserved">return</span><span class="plain"> ((</span><span class="identifier">t1</span><span class="plain">+</span><span class="identifier">t2</span><span class="plain">/2)/</span><span class="identifier">t2</span><span class="plain">)*</span><span class="identifier">t2</span><span class="plain">;</span>
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<span class="reserved">return</span><span class="plain"> -((-</span><span class="identifier">t1</span><span class="plain">+</span><span class="identifier">t2</span><span class="plain">/2)/</span><span class="identifier">t2</span><span class="plain">)*</span><span class="identifier">t2</span><span class="plain">;</span>
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<span class="plain">];</span>
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</pre>
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<p class="inwebparagraph"></p>
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