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@page "/Concat" |
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<PageTitle>Concatenator</PageTitle> |
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<PageScript Src="./Components/Pages/Concat.razor.js"/> |
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<main> |
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<p>A "concatenative language"</p> |
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<form id="form"> |
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<textarea id="input" placeholder="1 2 +" rows="5"></textarea> |
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<input type="submit" value="Run program"> |
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</form> |
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<Log/> |
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|
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<fieldset class="docs"> |
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<legend>Predefined operations</legend> |
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<details> |
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<summary>dup</summary> |
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<p>Duplicates the top value on the stack</p> |
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<div class="flex-spread"> |
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<span>[1, 2, 3]</span> |
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<span>dup</span> |
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</div> |
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<div class="flex-spread"> |
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<span>[1, 1, 2, 3]</span> |
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<span></span> |
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</div> |
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</details> |
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|
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<details> |
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<summary>drop</summary> |
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<p>Drops the top value on the stack</p> |
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<div class="flex-spread"> |
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<span>[1, 2, 3]</span> |
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<span>drop</span> |
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</div> |
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<div class="flex-spread"> |
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<span>[2, 3]</span> |
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<span></span> |
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</div> |
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</details> |
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|
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<details> |
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<summary>swap</summary> |
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<p>Swaps the top two values on the stack</p> |
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<div class="flex-spread"> |
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<span>[1, 2, 3]</span> |
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<span>swap</span> |
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</div> |
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<div class="flex-spread"> |
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<span>[2, 1, 3]</span> |
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<span></span> |
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</div> |
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</details> |
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|
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<details> |
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<summary>skip</summary> |
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<p>Skips forward in the program by the amount on the top of the stack. |
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If the value on the top of the stack is 0 or negative, |
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the value is dropped and the program does not skip ahead. |
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</p> |
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<div class="flex-spread"> |
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<span>[1, 2, 3]</span> |
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<span>skip drop dup</span> |
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</div> |
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<div class="flex-spread"> |
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<span>[2, 3]</span> |
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<span>dup</span> |
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</div> |
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<div class="flex-spread"> |
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<span>[2, 2, 3]</span> |
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<span></span> |
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</div> |
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Or |
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<div class="flex-spread"> |
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<span>[-1, 2, 3]</span> |
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<span>skip drop dup</span> |
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</div> |
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<div class="flex-spread"> |
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<span>[2, 3]</span> |
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<span>drop dup</span> |
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</div> |
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<div class="flex-spread"> |
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<span>[3]</span> |
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<span>dup</span> |
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</div> |
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<div class="flex-spread"> |
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<span>[3, 3]</span> |
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<span></span> |
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</div> |
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</details> |
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|
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<details> |
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<summary>: word ... ;</summary> |
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<p>Creates a new definition.</p> |
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<p>Example: ": double 2 * ;" defines a new word called double. Any subsequent mention of double will |
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replace the word with its definition.</p> |
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<div class="flex-spread"> |
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<span>[]</span> |
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<span>: double 2 * ; 3 double</span> |
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</div> |
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<div class="flex-spread"> |
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<span>[]</span> |
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<span>3 double</span> |
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</div> |
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<div class="flex-spread"> |
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<span>[3]</span> |
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<span>double</span> |
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</div> |
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<div class="flex-spread"> |
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<span>[3]</span> |
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<span>2 *</span> |
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</div> |
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<div class="flex-spread"> |
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<span>[2, 3]</span> |
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<span>*</span> |
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</div> |
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<div class="flex-spread"> |
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<span>[6] <==</span> |
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<span></span> |
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</div> |
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</details> |
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</fieldset> |
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<fieldset class="docs"> |
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<legend>Example programs</legend> |
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<details> |
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<summary>Factorial</summary> |
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<NavLink |
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href="/concat?in=FwAgxg9grgdgLgUwE4lQEygBxAJhAZwHcBDbAWhAG4AoUAQlRA2wEYQLJZEV8BrAS2wMAVFWoB2EHWpA"> |
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Replace program |
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</NavLink> |
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<pre> |
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: counter dup 2 swap - ; |
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: ! dup 1 - counter skip ! * ; |
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7 ! |
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</pre> |
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</details> |
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</fieldset> |
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</main> |