History variables: Difference between revisions
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Puppydrum64 (talk | contribs) |
m (→{{header|Phix}}: added syntax colouring, marked p2js compatible) |
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=={{header|Phix}}== |
=={{header|Phix}}== |
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No native support, but trivial to implement.<br> |
No native support, but trivial to implement.<br> |
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If you only need the history for a single variable, you can just do this: |
If you only need the history for a single variable, you can just do this, though it does not work under pwa/p2js: |
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<lang Phix> |
<!--<lang Phix>--> |
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<span style="color: #008080;">without</span> <span style="color: #008080;">js</span> <span style="color: #000080;font-style:italic;">-- (desktop/Phix only)</span> |
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<span style="color: #004080;">sequence</span> <span style="color: #000000;">history</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">{}</span> |
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type hvt(object o) |
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history = append(history,o) |
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<span style="color: #008080;">type</span> <span style="color: #000000;">hvt</span><span style="color: #0000FF;">(</span><span style="color: #004080;">object</span> <span style="color: #000000;">o</span><span style="color: #0000FF;">)</span> |
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return true |
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<span style="color: #000000;">history</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">append</span><span style="color: #0000FF;">(</span><span style="color: #000000;">history</span><span style="color: #0000FF;">,</span><span style="color: #000000;">o</span><span style="color: #0000FF;">)</span> |
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end type |
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<span style="color: #008080;">return</span> <span style="color: #004600;">true</span> |
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<span style="color: #008080;">end</span> <span style="color: #008080;">type</span> |
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hvt test = 1 |
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<span style="color: #000000;">hvt</span> <span style="color: #000000;">test</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">1</span> |
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test = 3 |
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<span style="color: #000000;">test</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">2</span> |
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?{"current",test} |
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<span style="color: #000000;">test</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">3</span> |
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?{"history",history}</lang> |
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<span style="color: #0000FF;">?{</span><span style="color: #008000;">"current"</span><span style="color: #0000FF;">,</span><span style="color: #000000;">test</span><span style="color: #0000FF;">}</span> |
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<span style="color: #0000FF;">?{</span><span style="color: #008000;">"history"</span><span style="color: #0000FF;">,</span><span style="color: #000000;">history</span><span style="color: #0000FF;">}</span> |
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<!--</lang>--> |
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{{out}} |
{{out}} |
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<pre> |
<pre> |
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{"history",{1,2,3}} |
{"history",{1,2,3}} |
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</pre> |
</pre> |
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Multiple history variables would require that routines must be invoked to create, update, and inspect them.<br> |
Multiple history variables would require that routines must be invoked to create, update, and inspect them, and would be pwa/p2js compatible.<br> |
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Writing this as a separate reusable component (but omitting destroy/freelist handling for simplicity): |
Writing this as a separate reusable component (but omitting destroy/freelist handling for simplicity): |
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<lang Phix>-- |
<!--<lang Phix>(phixonline)--> |
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<span style="color: #000080;font-style:italic;">-- history.e</span> |
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sequence histories = {} |
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<span style="color: #004080;">sequence</span> <span style="color: #000000;">histories</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">{}</span> |
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global function new_history_id(object v) |
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<span style="color: #008080;">global</span> <span style="color: #008080;">function</span> <span style="color: #000000;">new_history_id</span><span style="color: #0000FF;">(</span><span style="color: #004080;">object</span> <span style="color: #000000;">v</span><span style="color: #0000FF;">)</span> |
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histories = append(histories,{v}) |
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<span style="color: #000000;">histories</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">append</span><span style="color: #0000FF;">(</span><span style="color: #000000;">histories</span><span style="color: #0000FF;">,{</span><span style="color: #000000;">v</span><span style="color: #0000FF;">})</span> |
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return length(histories) |
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<span style="color: #008080;">return</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">histories</span><span style="color: #0000FF;">)</span> |
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end function |
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<span style="color: #008080;">end</span> <span style="color: #008080;">function</span> |
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global procedure set_hv(integer hv, object v) |
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<span style="color: #008080;">global</span> <span style="color: #008080;">procedure</span> <span style="color: #000000;">set_hv</span><span style="color: #0000FF;">(</span><span style="color: #004080;">integer</span> <span style="color: #000000;">hv</span><span style="color: #0000FF;">,</span> <span style="color: #004080;">object</span> <span style="color: #000000;">v</span><span style="color: #0000FF;">)</span> |
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histories[hv] = append(histories[hv],v) |
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<span style="color: #000000;">histories</span><span style="color: #0000FF;">[</span><span style="color: #000000;">hv</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">append</span><span style="color: #0000FF;">(</span><span style="color: #000000;">histories</span><span style="color: #0000FF;">[</span><span style="color: #000000;">hv</span><span style="color: #0000FF;">],</span><span style="color: #000000;">v</span><span style="color: #0000FF;">)</span> |
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end procedure |
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<span style="color: #008080;">end</span> <span style="color: #008080;">procedure</span> |
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global function get_hv(integer hv) |
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<span style="color: #008080;">global</span> <span style="color: #008080;">function</span> <span style="color: #000000;">get_hv</span><span style="color: #0000FF;">(</span><span style="color: #004080;">integer</span> <span style="color: #000000;">hv</span><span style="color: #0000FF;">)</span> |
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return histories[hv][$] |
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<span style="color: #008080;">return</span> <span style="color: #000000;">histories</span><span style="color: #0000FF;">[</span><span style="color: #000000;">hv</span><span style="color: #0000FF;">][$]</span> |
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end function |
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<span style="color: #008080;">end</span> <span style="color: #008080;">function</span> |
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global function get_hv_full_history(integer hv) |
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<span style="color: #008080;">global</span> <span style="color: #008080;">function</span> <span style="color: #000000;">get_hv_full_history</span><span style="color: #0000FF;">(</span><span style="color: #004080;">integer</span> <span style="color: #000000;">hv</span><span style="color: #0000FF;">)</span> |
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return histories[hv] |
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<span style="color: #008080;">return</span> <span style="color: #000000;">histories</span><span style="color: #0000FF;">[</span><span style="color: #000000;">hv</span><span style="color: #0000FF;">]</span> |
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end function</lang> |
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<span style="color: #008080;">end</span> <span style="color: #008080;">function</span> |
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<!--</lang>--> |
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And use it like this |
And use it like this |
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<lang Phix> |
<!--<lang Phix>(phixonline)--> |
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<span style="color: #008080;">include</span> <span style="color: #000000;">history</span><span style="color: #0000FF;">.</span><span style="color: #000000;">e</span> |
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constant test2 = new_history_id(1) |
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<span style="color: #008080;">constant</span> <span style="color: #000000;">test2</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">new_history_id</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">)</span> |
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set_hv(test2, 2) |
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<span style="color: #000000;">set_hv</span><span style="color: #0000FF;">(</span><span style="color: #000000;">test2</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">2</span><span style="color: #0000FF;">)</span> |
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set_hv(test2, 3) |
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<span style="color: #000000;">set_hv</span><span style="color: #0000FF;">(</span><span style="color: #000000;">test2</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">3</span><span style="color: #0000FF;">)</span> |
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?{"current",get_hv(test2)} |
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<span style="color: #0000FF;">?{</span><span style="color: #008000;">"current"</span><span style="color: #0000FF;">,</span><span style="color: #000000;">get_hv</span><span style="color: #0000FF;">(</span><span style="color: #000000;">test2</span><span style="color: #0000FF;">)}</span> |
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?{"history",get_hv_full_history(test2)}</lang> |
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<span style="color: #0000FF;">?{</span><span style="color: #008000;">"history"</span><span style="color: #0000FF;">,</span><span style="color: #000000;">get_hv_full_history</span><span style="color: #0000FF;">(</span><span style="color: #000000;">test2</span><span style="color: #0000FF;">)}</span> |
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<!--</lang>--> |
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Same output. Of course test2 does not ''have'' to be a constant, but it may help. |
Same output. Of course test2 does not ''have'' to be a constant, but it may help. |
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