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Execute Brain****/Elena (view source)

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ELENA 6.x:
<langsyntaxhighlight lang="elena">import system'collections;
import system'routines;
import system'dynamic'expressions;
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class TapeAssembler
{
Stack theBrackets_brackets;
List<Expression> theTape_tape;
constructor()
{
theBrackets_brackets := new Stack();
theTape_tape := new List<Expression>();
theTape_tape.append(Expression.DeclareAndAssigning(
new ScopeVariable("ptr"),
Expression.Constant(0)));
}
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open()
{
theBrackets_brackets.push(theTape_tape);
theTape_tape := new List<Expression>();
}
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Expression.Constant($0)
),
ExpressionCodeblockExpression.CodeBlocknew(theTape_tape.Value));
theTape_tape := theBrackets_brackets.pop();
theTape_tape.append(loop)
}
input()
{
theTape_tape.append(
Expression.MessageCall(
new Message("setAt[3]"),
Expression.Variable(new ScopeVariable("tape")),
Expression.Variable(new ScopeVariable("ptr")),
Expression.MessageCall(
new Message("readChar[1]"),
Expression.Constant(console)
)
)
)
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output()
{
theTape_tape.append(
Expression.MessageCall(
new Message("write[2]"),
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Expression.MessageCall(
new Message("at[2]"),
Expression.Variable(new ScopeVariable("tape")),
Expression.Variable(new ScopeVariable("ptr"))
)
)
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next()
{
theTape_tape.append(
Expression.Assigning(
new ScopeVariable("ptr"),
Expression.MessageCall(
new Message("add[2]"),
Expression.Variable(new ScopeVariable("ptr")),
Expression.Constant(1))))
}
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previous()
{
theTape_tape.append(
Expression.Assigning(
new ScopeVariable("ptr"),
Expression.MessageCall(
new Message("subtract[2]"),
Expression.Variable(new ScopeVariable("ptr")),
Expression.Constant(1))))
}
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increase()
{
theTape_tape.append(
Expression.MessageCall(
new Message("setAt[3]"),
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Expression.MessageCall(
new Message("toInt[2]"),
Expression.Constant(convertorintConvertExt),
Expression.MessageCall(
new Message("at[2]"),
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decrease()
{
theTape_tape.append(
Expression.MessageCall(
new Message("setAt[3]"),
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Expression.MessageCall(
new Message("toInt[2]"),
Expression.Constant(convertorintConvertExt),
Expression.MessageCall(
new Message("at[2]"),
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compiled()
{
var program := DynamicSingleton.newload(
Expression.Method(
"eval",
CodeblockExpression.new ScopeVariable("tape"_tape.Value),
ExpressionScopeIdentifier.CodeBlockVariable(theTape.Value"tape"))).compiled();
).compile();
^(tape){ program.eval(tape) }
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var bfProgram := TapeAssembler.load(bfAssemblyProgram).compiled();
 
var bfTape := Array.allocate(1024).populate::(n => $0);
 
console.writeLine(bf_program);
 
bfProgram(bfTape)
}</langsyntaxhighlight>
The grammar:
<langsyntaxhighlight lang="elena">[[
#grammar build
#grammar cf
 
#define start ::= <= system'dynamic'ClosureTape ( => command commands <= ) =>;
<=
system'dynamic'DynamicTape (
system'dynamic'AllocFunction ( "1" )
system'dynamic'LocalFunction ( "2" ) => command commands
<= ) =>;
 
#define start ::= $eof;
 
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#define commands ::= $eof;
 
#define command ::= <= system'dynamic'MessageClosureMessageFunction ( "output[1]" ) => ".";
#define command ::= <= system'dynamic'MessageClosureMessageFunction ( "input[1]" ) => ",";
#define command ::= <= system'dynamic'MessageClosureMessageFunction ( "previous[1]" ) => "<";
#define command ::= <= system'dynamic'MessageClosureMessageFunction ( "next[1]" ) => ">";
#define command ::= <= system'dynamic'MessageClosureMessageFunction ( "increase[1]" ) => "+";
#define command ::= <= system'dynamic'MessageClosureMessageFunction ( "decrease[1]" ) => "-";
#define command ::= <= system'dynamic'MessageClosureMessageFunction ( "open[1]" ) => "[";
#define command ::= <= system'dynamic'MessageClosureMessageFunction ( "close[1]" ) => "]";
 
#define comment ::= " " comments;
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#mode symbolic;
]]</langsyntaxhighlight>
{{out}}
<pre>
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