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Ingy döt Net 2023-07-01 11:58:00 -04:00
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<span style="color: #000080;font-style:italic;">-- demo\rosetta\Runtime_evaluation.exw</span>
<span style="color: #008080;">without</span> <span style="color: #008080;">javascript_semantics</span>
<span style="color: #7060A8;">requires</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"1.0.1"</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">include</span> <span style="color: #7060A8;">eval</span><span style="color: #0000FF;">.</span><span style="color: #000000;">e</span> <span style="color: #000080;font-style:italic;">-- (not an autoinclude, pulls in around 90% of the interpreter/compiler proper)</span>
<span style="color: #004080;">string</span> <span style="color: #000000;">code</span> <span style="color: #0000FF;">=</span> <span style="color: #008000;">"""
integer i = 0
bool r_init = false
sequence r
if not r_init then r = {} end if
for k=1 to 4 do
i += k
r &= k
end for
"""</span>
<span style="color: #0000FF;">?</span><span style="color: #7060A8;">eval</span><span style="color: #0000FF;">(</span><span style="color: #000000;">code</span><span style="color: #0000FF;">,{</span><span style="color: #008000;">"i"</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"r"</span><span style="color: #0000FF;">})</span> <span style="color: #000080;font-style:italic;">-- prints {10,{1,2,3,4}}</span>
<span style="color: #0000FF;">?</span><span style="color: #7060A8;">eval</span><span style="color: #0000FF;">(</span><span style="color: #000000;">code</span><span style="color: #0000FF;">,{</span><span style="color: #008000;">"r"</span><span style="color: #0000FF;">},{{</span><span style="color: #008000;">"r_init"</span><span style="color: #0000FF;">,</span><span style="color: #004600;">true</span><span style="color: #0000FF;">},{</span><span style="color: #008000;">"r"</span><span style="color: #0000FF;">,{</span><span style="color: #000000;">5</span><span style="color: #0000FF;">}}})</span> <span style="color: #000080;font-style:italic;">-- prints {5,1,2,3,4}</span>
<span style="color: #0000FF;">?</span><span style="color: #7060A8;">eval</span><span style="color: #0000FF;">(</span><span style="color: #000000;">code</span><span style="color: #0000FF;">,{</span><span style="color: #008000;">"i"</span><span style="color: #0000FF;">},{{</span><span style="color: #008000;">"i"</span><span style="color: #0000FF;">,</span><span style="color: #000000;">15</span><span style="color: #0000FF;">}})</span> <span style="color: #000080;font-style:italic;">-- prints {25}</span>
<span style="color: #0000FF;">{}</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">eval</span><span style="color: #0000FF;">(</span><span style="color: #008000;">`puts(1,"Hello World\n")`</span><span style="color: #0000FF;">)</span> <span style="color: #000080;font-style:italic;">-- prints Hello World</span>
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<span style="color: #008080;">function</span> <span style="color: #000000;">eval_expression</span><span style="color: #0000FF;">(</span><span style="color: #004080;">string</span> <span style="color: #000000;">expr</span><span style="color: #0000FF;">)</span>
<span style="color: #004080;">object</span> <span style="color: #0000FF;">{</span><span style="color: #000000;">res</span><span style="color: #0000FF;">}</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">eval</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">sprintf</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"object x = %s"</span><span style="color: #0000FF;">,{</span><span style="color: #000000;">expr</span><span style="color: #0000FF;">}),{</span><span style="color: #008000;">"x"</span><span style="color: #0000FF;">})</span>
<span style="color: #008080;">return</span> <span style="color: #000000;">res</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">function</span>
<span style="color: #0000FF;">?</span><span style="color: #000000;">eval_expression</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"3+4"</span><span style="color: #0000FF;">)</span> <span style="color: #000080;font-style:italic;">-- prints 7</span>
<!--