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=={{header|Phix}}== |
=={{header|Phix}}== |
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<lang Phix> |
<!--<lang Phix>(phixonline)--> |
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<span style="color: #008080;">with</span> <span style="color: #008080;">javascript_semantics</span> |
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SEGMENTS |
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<span style="color: #008080;">enum</span> <span style="color: #000000;">OFFSET</span><span style="color: #0000FF;">,</span> <span style="color: #000080;font-style:italic;">-- (first spare slot [0=none])</span> |
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<span style="color: #000000;">SEGMENTS</span> |
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function new_vlist() |
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return {0,{}} -- offset of 0, no segments |
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<span style="color: #008080;">function</span> <span style="color: #000000;">new_vlist</span><span style="color: #0000FF;">()</span> |
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end function |
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<span style="color: #008080;">return</span> <span style="color: #0000FF;">{</span><span style="color: #000000;">0</span><span style="color: #0000FF;">,{}}</span> <span style="color: #000080;font-style:italic;">-- offset of 0, no segments</span> |
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<span style="color: #008080;">end</span> <span style="color: #008080;">function</span> |
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function get_vlist(sequence v, integer k) |
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-- locate kth element |
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<span style="color: #008080;">function</span> <span style="color: #000000;">get_vlist</span><span style="color: #0000FF;">(</span><span style="color: #004080;">sequence</span> <span style="color: #000000;">v</span><span style="color: #0000FF;">,</span> <span style="color: #004080;">integer</span> <span style="color: #000000;">k</span><span style="color: #0000FF;">)</span> |
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if k>0 then |
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<span style="color: #000080;font-style:italic;">-- locate kth element</span> |
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k += v[OFFSET] |
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<span style="color: #008080;">if</span> <span style="color: #000000;">k</span><span style="color: #0000FF;">></span><span style="color: #000000;">0</span> <span style="color: #008080;">then</span> |
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integer sg = 1 |
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<span style="color: #000000;">k</span> <span style="color: #0000FF;">+=</span> <span style="color: #000000;">v</span><span style="color: #0000FF;">[</span><span style="color: #000000;">OFFSET</span><span style="color: #0000FF;">]</span> |
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while sg<=length(v[SEGMENTS]) do |
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<span style="color: #004080;">integer</span> <span style="color: #000000;">sg</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">1</span> |
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sequence vsg = v[SEGMENTS][sg] |
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<span style="color: #008080;">while</span> <span style="color: #000000;">sg</span><span style="color: #0000FF;"><=</span><span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">v</span><span style="color: #0000FF;">[</span><span style="color: #000000;">SEGMENTS</span><span style="color: #0000FF;">])</span> <span style="color: #008080;">do</span> |
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if k<= length(vsg) then return vsg[k] end if |
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<span style="color: #004080;">sequence</span> <span style="color: #000000;">vsg</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">v</span><span style="color: #0000FF;">[</span><span style="color: #000000;">SEGMENTS</span><span style="color: #0000FF;">][</span><span style="color: #000000;">sg</span><span style="color: #0000FF;">]</span> |
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k -= length(vsg) |
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<span style="color: #008080;">if</span> <span style="color: #000000;">k</span><span style="color: #0000FF;"><=</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">vsg</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">then</span> <span style="color: #008080;">return</span> <span style="color: #000000;">vsg</span><span style="color: #0000FF;">[</span><span style="color: #000000;">k</span><span style="color: #0000FF;">]</span> <span style="color: #008080;">end</span> <span style="color: #008080;">if</span> |
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sg += 1 |
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<span style="color: #000000;">k</span> <span style="color: #0000FF;">-=</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">vsg</span><span style="color: #0000FF;">)</span> |
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end while |
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<span style="color: #000000;">sg</span> <span style="color: #0000FF;">+=</span> <span style="color: #000000;">1</span> |
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end if |
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<span style="color: #008080;">end</span> <span style="color: #008080;">while</span> |
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throw("index out of range") |
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<span style="color: #008080;">end</span> <span style="color: #008080;">if</span> |
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end function |
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<span style="color: #008080;">throw</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"index out of range"</span><span style="color: #0000FF;">)</span> |
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<span style="color: #008080;">end</span> <span style="color: #008080;">function</span> |
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function cons(sequence v, object a) |
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-- add an element to the front of v |
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<span style="color: #008080;">function</span> <span style="color: #000000;">cons</span><span style="color: #0000FF;">(</span><span style="color: #004080;">sequence</span> <span style="color: #000000;">v</span><span style="color: #0000FF;">,</span> <span style="color: #004080;">object</span> <span style="color: #000000;">a</span><span style="color: #0000FF;">)</span> |
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if length(v[SEGMENTS])=0 then |
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<span style="color: #000080;font-style:italic;">-- add an element to the front of v</span> |
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return {0,{{a}}} |
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<span style="color: #008080;">if</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">v</span><span style="color: #0000FF;">[</span><span style="color: #000000;">SEGMENTS</span><span style="color: #0000FF;">])=</span><span style="color: #000000;">0</span> <span style="color: #008080;">then</span> |
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end if |
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<span style="color: #008080;">return</span> <span style="color: #0000FF;">{</span><span style="color: #000000;">0</span><span style="color: #0000FF;">,{{</span><span style="color: #000000;">a</span><span style="color: #0000FF;">}}}</span> |
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integer offset = v[OFFSET] |
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<span style="color: #008080;">end</span> <span style="color: #008080;">if</span> |
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if offset=0 then |
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<span style="color: #004080;">integer</span> <span style="color: #000000;">offset</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">v</span><span style="color: #0000FF;">[</span><span style="color: #000000;">OFFSET</span><span style="color: #0000FF;">]</span> |
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offset = length(v[SEGMENTS][1])*2 |
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<span style="color: #008080;">if</span> <span style="color: #000000;">offset</span><span style="color: #0000FF;">=</span><span style="color: #000000;">0</span> <span style="color: #008080;">then</span> |
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v[SEGMENTS] = prepend(v[SEGMENTS],repeat(0,offset)) |
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<span style="color: #000000;">offset</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">v</span><span style="color: #0000FF;">[</span><span style="color: #000000;">SEGMENTS</span><span style="color: #0000FF;">][</span><span style="color: #000000;">1</span><span style="color: #0000FF;">])*</span><span style="color: #000000;">2</span> |
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end if |
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<span style="color: #000000;">v</span><span style="color: #0000FF;">[</span><span style="color: #000000;">SEGMENTS</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">prepend</span><span style="color: #0000FF;">(</span><span style="color: #000000;">v</span><span style="color: #0000FF;">[</span><span style="color: #000000;">SEGMENTS</span><span style="color: #0000FF;">],</span><span style="color: #7060A8;">repeat</span><span style="color: #0000FF;">(</span><span style="color: #000000;">0</span><span style="color: #0000FF;">,</span><span style="color: #000000;">offset</span><span style="color: #0000FF;">))</span> |
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v[SEGMENTS][1][offset] = a |
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<span style="color: #008080;">end</span> <span style="color: #008080;">if</span> |
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v[OFFSET] = offset-1 |
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<span style="color: #000000;">v</span><span style="color: #0000FF;">[</span><span style="color: #000000;">SEGMENTS</span><span style="color: #0000FF;">][</span><span style="color: #000000;">1</span><span style="color: #0000FF;">][</span><span style="color: #000000;">offset</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">a</span> |
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return v |
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<span style="color: #000000;">v</span><span style="color: #0000FF;">[</span><span style="color: #000000;">OFFSET</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">offset</span><span style="color: #0000FF;">-</span><span style="color: #000000;">1</span> |
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end function |
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<span style="color: #008080;">return</span> <span style="color: #000000;">v</span> |
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<span style="color: #008080;">end</span> <span style="color: #008080;">function</span> |
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function cdr(sequence v) |
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-- remove first element of v |
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<span style="color: #008080;">function</span> <span style="color: #000000;">cdr</span><span style="color: #0000FF;">(</span><span style="color: #004080;">sequence</span> <span style="color: #000000;">v</span><span style="color: #0000FF;">)</span> |
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if length(v[SEGMENTS])=0 then |
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<span style="color: #000080;font-style:italic;">-- remove first element of v</span> |
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throw("cdr invoked on empty VList") |
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<span style="color: #008080;">if</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">v</span><span style="color: #0000FF;">[</span><span style="color: #000000;">SEGMENTS</span><span style="color: #0000FF;">])=</span><span style="color: #000000;">0</span> <span style="color: #008080;">then</span> |
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end if |
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<span style="color: #008080;">throw</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"cdr invoked on empty VList"</span><span style="color: #0000FF;">)</span> |
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integer offset = v[OFFSET]+1 |
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<span style="color: #008080;">end</span> <span style="color: #008080;">if</span> |
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if offset>length(v[SEGMENTS][1]) then |
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<span style="color: #004080;">integer</span> <span style="color: #000000;">offset</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">v</span><span style="color: #0000FF;">[</span><span style="color: #000000;">OFFSET</span><span style="color: #0000FF;">]+</span><span style="color: #000000;">1</span> |
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v[SEGMENTS] = v[SEGMENTS][2..$] |
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<span style="color: #008080;">if</span> <span style="color: #000000;">offset</span><span style="color: #0000FF;">></span><span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">v</span><span style="color: #0000FF;">[</span><span style="color: #000000;">SEGMENTS</span><span style="color: #0000FF;">][</span><span style="color: #000000;">1</span><span style="color: #0000FF;">])</span> <span style="color: #008080;">then</span> |
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v[OFFSET] = 1 |
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<span style="color: #000000;">v</span><span style="color: #0000FF;">[</span><span style="color: #000000;">SEGMENTS</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">v</span><span style="color: #0000FF;">[</span><span style="color: #000000;">SEGMENTS</span><span style="color: #0000FF;">][</span><span style="color: #000000;">2</span><span style="color: #0000FF;">..$]</span> |
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else |
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<span style="color: #000000;">v</span><span style="color: #0000FF;">[</span><span style="color: #000000;">OFFSET</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">1</span> |
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v[OFFSET] = offset |
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<span style="color: #008080;">else</span> |
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end if |
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<span style="color: #000000;">v</span><span style="color: #0000FF;">[</span><span style="color: #000000;">OFFSET</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">offset</span> |
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return v |
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<span style="color: #008080;">end</span> <span style="color: #008080;">if</span> |
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end function |
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<span style="color: #008080;">return</span> <span style="color: #000000;">v</span> |
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<span style="color: #008080;">end</span> <span style="color: #008080;">function</span> |
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function vlist_size(sequence v) |
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-- compute the size of v |
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<span style="color: #008080;">function</span> <span style="color: #000000;">vlist_size</span><span style="color: #0000FF;">(</span><span style="color: #004080;">sequence</span> <span style="color: #000000;">v</span><span style="color: #0000FF;">)</span> |
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if length(v[SEGMENTS])=0 then return 0 end if |
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<span style="color: #000080;font-style:italic;">-- compute the size of v</span> |
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return length(v[SEGMENTS][1])*2 -v[OFFSET] -1 |
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<span style="color: #008080;">if</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">v</span><span style="color: #0000FF;">[</span><span style="color: #000000;">SEGMENTS</span><span style="color: #0000FF;">])=</span><span style="color: #000000;">0</span> <span style="color: #008080;">then</span> <span style="color: #008080;">return</span> <span style="color: #000000;">0</span> <span style="color: #008080;">end</span> <span style="color: #008080;">if</span> |
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end function |
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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;">v</span><span style="color: #0000FF;">[</span><span style="color: #000000;">SEGMENTS</span><span style="color: #0000FF;">][</span><span style="color: #000000;">1</span><span style="color: #0000FF;">])*</span><span style="color: #000000;">2</span> <span style="color: #0000FF;">-</span><span style="color: #000000;">v</span><span style="color: #0000FF;">[</span><span style="color: #000000;">OFFSET</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">-</span><span style="color: #000000;">1</span> |
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<span style="color: #008080;">end</span> <span style="color: #008080;">function</span> |
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function sprint_vlist(sequence v) |
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return sprint(flatten(v[SEGMENTS])[v[OFFSET]+1..$]) |
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<span style="color: #008080;">function</span> <span style="color: #000000;">sprint_vlist</span><span style="color: #0000FF;">(</span><span style="color: #004080;">sequence</span> <span style="color: #000000;">v</span><span style="color: #0000FF;">)</span> |
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end function |
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<span style="color: #008080;">return</span> <span style="color: #7060A8;">sprint</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">flatten</span><span style="color: #0000FF;">(</span><span style="color: #000000;">v</span><span style="color: #0000FF;">[</span><span style="color: #000000;">SEGMENTS</span><span style="color: #0000FF;">])[</span><span style="color: #000000;">v</span><span style="color: #0000FF;">[</span><span style="color: #000000;">OFFSET</span><span style="color: #0000FF;">]+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">..$])</span> |
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<span style="color: #008080;">end</span> <span style="color: #008080;">function</span> |
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procedure print_vlist_structure(sequence v) |
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printf(1,"Offset: %d\n",v[OFFSET]) |
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<span style="color: #008080;">procedure</span> <span style="color: #000000;">print_vlist_structure</span><span style="color: #0000FF;">(</span><span style="color: #004080;">sequence</span> <span style="color: #000000;">v</span><span style="color: #0000FF;">)</span> |
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pp(v[SEGMENTS],{pp_Nest,1}) |
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<span style="color: #7060A8;">printf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"Offset: %d\n"</span><span style="color: #0000FF;">,</span><span style="color: #000000;">v</span><span style="color: #0000FF;">[</span><span style="color: #000000;">OFFSET</span><span style="color: #0000FF;">])</span> |
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end procedure |
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<span style="color: #7060A8;">pp</span><span style="color: #0000FF;">(</span><span style="color: #000000;">v</span><span style="color: #0000FF;">[</span><span style="color: #000000;">SEGMENTS</span><span style="color: #0000FF;">],{</span><span style="color: #004600;">pp_Nest</span><span style="color: #0000FF;">,</span><span style="color: #000000;">1</span><span style="color: #0000FF;">})</span> |
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<span style="color: #008080;">end</span> <span style="color: #008080;">procedure</span> |
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procedure main() |
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sequence v = new_vlist() |
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<span style="color: #008080;">procedure</span> <span style="color: #000000;">main</span><span style="color: #0000FF;">()</span> |
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printf(1,"Before adding any elements, empty VList: %s\n",{sprint_vlist(v)}) |
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<span style="color: #004080;">sequence</span> <span style="color: #000000;">v</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">new_vlist</span><span style="color: #0000FF;">()</span> |
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print_vlist_structure(v) |
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<span style="color: #7060A8;">printf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"Before adding any elements, empty VList: %s\n"</span><span style="color: #0000FF;">,{</span><span style="color: #000000;">sprint_vlist</span><span style="color: #0000FF;">(</span><span style="color: #000000;">v</span><span style="color: #0000FF;">)})</span> |
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<span style="color: #000000;">print_vlist_structure</span><span style="color: #0000FF;">(</span><span style="color: #000000;">v</span><span style="color: #0000FF;">)</span> |
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for a=6 to 1 by -1 do v = cons(v,a) end for |
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printf(1,"Demonstrating cons method, 6 elements added: %s\n",{sprint_vlist(v)}) |
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<span style="color: #008080;">for</span> <span style="color: #000000;">a</span><span style="color: #0000FF;">=</span><span style="color: #000000;">6</span> <span style="color: #008080;">to</span> <span style="color: #000000;">1</span> <span style="color: #008080;">by</span> <span style="color: #0000FF;">-</span><span style="color: #000000;">1</span> <span style="color: #008080;">do</span> <span style="color: #000000;">v</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">cons</span><span style="color: #0000FF;">(</span><span style="color: #000000;">v</span><span style="color: #0000FF;">,</span><span style="color: #000000;">a</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">end</span> <span style="color: #008080;">for</span> |
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print_vlist_structure(v) |
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<span style="color: #7060A8;">printf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"Demonstrating cons method, 6 elements added: %s\n"</span><span style="color: #0000FF;">,{</span><span style="color: #000000;">sprint_vlist</span><span style="color: #0000FF;">(</span><span style="color: #000000;">v</span><span style="color: #0000FF;">)})</span> |
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<span style="color: #000000;">print_vlist_structure</span><span style="color: #0000FF;">(</span><span style="color: #000000;">v</span><span style="color: #0000FF;">)</span> |
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v = cdr(v) |
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printf(1,"Demonstrating cdr method, 1 element removed: %s\n",{sprint_vlist(v)}) |
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<span style="color: #000000;">v</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">cdr</span><span style="color: #0000FF;">(</span><span style="color: #000000;">v</span><span style="color: #0000FF;">)</span> |
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print_vlist_structure(v) |
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<span style="color: #7060A8;">printf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"Demonstrating cdr method, 1 element removed: %s\n"</span><span style="color: #0000FF;">,{</span><span style="color: #000000;">sprint_vlist</span><span style="color: #0000FF;">(</span><span style="color: #000000;">v</span><span style="color: #0000FF;">)})</span> |
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<span style="color: #000000;">print_vlist_structure</span><span style="color: #0000FF;">(</span><span style="color: #000000;">v</span><span style="color: #0000FF;">)</span> |
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printf(1,"Demonstrating size property, size = %d\n",vlist_size(v)) |
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-- (note this is 1-based indexing) |
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<span style="color: #7060A8;">printf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"Demonstrating size property, size = %d\n"</span><span style="color: #0000FF;">,</span><span style="color: #000000;">vlist_size</span><span style="color: #0000FF;">(</span><span style="color: #000000;">v</span><span style="color: #0000FF;">))</span> |
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printf(1,"Demonstrating element access, v[3] = %d\n",get_vlist(v,3)) |
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<span style="color: #000080;font-style:italic;">-- (note this is 1-based indexing)</span> |
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<span style="color: #7060A8;">printf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"Demonstrating element access, v[3] = %d\n"</span><span style="color: #0000FF;">,</span><span style="color: #000000;">get_vlist</span><span style="color: #0000FF;">(</span><span style="color: #000000;">v</span><span style="color: #0000FF;">,</span><span style="color: #000000;">3</span><span style="color: #0000FF;">))</span> |
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v = cdr(cdr(cdr(v))) |
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printf(1,"Demonstrating cdr method again, 3 more elements removed: %s, size = %d\n", |
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<span style="color: #000000;">v</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">cdr</span><span style="color: #0000FF;">(</span><span style="color: #000000;">cdr</span><span style="color: #0000FF;">(</span><span style="color: #000000;">cdr</span><span style="color: #0000FF;">(</span><span style="color: #000000;">v</span><span style="color: #0000FF;">)))</span> |
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{sprint_vlist(v),vlist_size(v)}) |
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<span style="color: #7060A8;">printf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"Demonstrating cdr method again, 3 more elements removed: %s, size = %d\n"</span><span style="color: #0000FF;">,</span> |
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print_vlist_structure(v) |
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<span style="color: #0000FF;">{</span><span style="color: #000000;">sprint_vlist</span><span style="color: #0000FF;">(</span><span style="color: #000000;">v</span><span style="color: #0000FF;">),</span><span style="color: #000000;">vlist_size</span><span style="color: #0000FF;">(</span><span style="color: #000000;">v</span><span style="color: #0000FF;">)})</span> |
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<span style="color: #000000;">print_vlist_structure</span><span style="color: #0000FF;">(</span><span style="color: #000000;">v</span><span style="color: #0000FF;">)</span> |
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for a=7 to 9 do v = cons(v,a) end for -- (this time not by -1; {9 8 7 5 6} is expected) |
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printf(1,"Demonstrating cons method, 3 more elements added: %s, size = %d\n", |
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<span style="color: #008080;">for</span> <span style="color: #000000;">a</span><span style="color: #0000FF;">=</span><span style="color: #000000;">7</span> <span style="color: #008080;">to</span> <span style="color: #000000;">9</span> <span style="color: #008080;">do</span> <span style="color: #000000;">v</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">cons</span><span style="color: #0000FF;">(</span><span style="color: #000000;">v</span><span style="color: #0000FF;">,</span><span style="color: #000000;">a</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">end</span> <span style="color: #008080;">for</span> <span style="color: #000080;font-style:italic;">-- (this time not by -1; {9 8 7 5 6} is expected)</span> |
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{sprint_vlist(v),vlist_size(v)}) |
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<span style="color: #7060A8;">printf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"Demonstrating cons method, 3 more elements added: %s, size = %d\n"</span><span style="color: #0000FF;">,</span> |
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print_vlist_structure(v) |
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<span style="color: #0000FF;">{</span><span style="color: #000000;">sprint_vlist</span><span style="color: #0000FF;">(</span><span style="color: #000000;">v</span><span style="color: #0000FF;">),</span><span style="color: #000000;">vlist_size</span><span style="color: #0000FF;">(</span><span style="color: #000000;">v</span><span style="color: #0000FF;">)})</span> |
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<span style="color: #000000;">print_vlist_structure</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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main()</lang> |
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<span style="color: #008080;">end</span> <span style="color: #008080;">procedure</span> |
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<span style="color: #000000;">main</span><span style="color: #0000FF;">()</span> |
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<!--</lang>--> |
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{{out}} |
{{out}} |
||
<pre> |
<pre> |