Haxe got (awesome) macros!

Research Paper In Technology However I felt like it was the right moment to go back on the blog, to talk you about the new awesome Haxe macro system.

School Application Essay I must say I’m extremely happy about that addition: one of the most important reasons I’m so happy is the fact that instead of implementing an old-and-bording Macro system ala C/C++, Nicolas decided to go for a much more powerful macro system, which allows typesafe macros and real runtime code generation.

Moreover you have access to almost the whole neko library (io, net, etc) which means you can write extremely powerful code generators and DSL! That’s an awesome feature – really.

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Top Down or Bottom Up for Expression Evaluation ?

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I will not release today the port because actually I had not time to make sure it is bugfree and I’ve only a working version for Mac, but I plan to release it shortly if you will ever need it for your own tasks. My goal for today was to compare the speed of the parser I wrote with an automatically generated bottom up parser, to see which is the faster approach.

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Research Papers Neural Networks Pdf The parser grammar is really simple and really readable:

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%{
%}
%token NUMBER SYMBOL
%left '+' '-'
%left '*' '/'
%left NEG
%%
program
: expr                { Vars.result = $1; }
;
expr
: expr '+' expr       { $$ = $1 + $3; }
| expr '-' expr       { $$ = $1 - $3; }
| expr '*' expr       { $$ = $1 * $3; }
| expr '/' expr       { $$ = $1 / $3; }
| '-' expr %prec NEG  { $$ = -$2; }
| '(' expr ')'        { $$ = $2; }
| SYMBOL '(' expr ')' {
if( Vars.SYMBOL_TABLE[ $1 ] )
{
$$ = Vars.SYMBOL_TABLE[ $1 ]( $3 );
} else
{
trace( "can't find function" );
}
}
| SYMBOL              {
if( Vars.SYMBOL_TABLE[ $1 ] )
{
$$ = Vars.SYMBOL_TABLE[ $1 ];
} else
{
trace( "can't find symbol" );
}
}
| NUMBER              { $$ = yyval; }
;
%%

Runtime expression evaluation in ActionScript

Essay Writers Crossword Clue Some days ago a guy on the forum asked about how to http://www.goldcoastaustralia.com/?cv-writing-service-cork Cv Writing Service Cork evaluate at runtime simple mathematical expressions with support for symbols and function calls.

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import it.sephiroth.expr.CompiledExpression;
import it.sephiroth.expr.Parser;
import it.sephiroth.expr.Scanner;
public class Example
{
public static function run(): void
{
var expression: String = "sin( x / ( 8 / 2 + (-0.12 + 2.3) * x / x ) ) * 100";
var scanner: Scanner = new Scanner( expression );
var parser: Parser = new Parser( scanner );
var compiled: CompiledExpression = parser.parse();
var context: Object = {
x:    100,
sin:   Math.sin,
cos:  Math.cos
};
trace( 'Postfix:', compiled.toString() );
trace( 'Result:', compiled.execute( context ) );
}
}

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Actionscript parsing experiences: PyBison & PLY

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http://vinkenjagt.nl/?pay-to-write-papers Pay To Write Papers Last day I founded a python library (pybison) which runs the generated python parser at near the speed of C-based parsers, due to direct hooks into bison-generated C code.
Cool, unfortunately I couldn’t compiled it for Windows and so I made my test on Ubuntu only. What I did was just to export the already written lexer/grammar using bison2py (boundled with pybison) and run it.

The run.py file accept these parameters:

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usage: run.py [options]
options:
-h, --help            show this help message and exit
-v, --verbose         Turn on verbose mode
-o OUTPUT_FILE, --output=OUTPUT_FILE
Don't print to stdout but to the output file
-i INPUT_FILE, --input=INPUT_FILE
Input file to be parsed
-x, --to-xml          Returns a human-readable xml representation of the
parse tree
-b, --bison-debug     Print the Bison/Flex debug

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Descriptive Essay Help The second test I did was using PLY, an implementation of lex and yacc parsing tools for Python. Being implemented entirely in python it should be much more slower that pybison, but I didn’t find any difference with the pybison parser version. In fact PLY , like the traditional bison, creates tables starting from the grammar syntax.
Ok, Both of the implementations are slower that the pure C parser, but extremely faster that antlr!
(They took more or less 0.02 to 0.5 secs for parsing and generating the AST.)
Unlike pybison PLY is still mantained and offers more features and a better error handling.. even if the whole grammar has to be rewritten in python, and it can be compiled in Windows too.

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python run.py {filename}