Scripting Flash apps: scanning the input file

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http://www.beaconpoint.net/?custom-thesis-service Custom Thesis Service Writing a general and reusable scanner is usually a good practice. A common approach is to use some scanner generators, that are usually regular expression based too but are able to generate the code for a scanner at compile time. Our approach is different (and generates slower scanners) because regular expressions are evaluated at runtime; but it is fine for a test project.

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package test
{
import it.sephiroth.scripting.utils.RegexLexer;
import it.sephiroth.scripting.utils.RegexLexerContext;
import it.sephiroth.scripting.utils.Token;
public class PBLexer extends RegexLexer
{
private static const keyword_map: Object = {
languageVersion:  TokensTable.LANGUAGE_VERSION,
kernel:        TokensTable.KERNEL,
parameter:      TokensTable.PARAMETER,
input:        TokensTable.INPUT,
image1:        TokensTable.IMAGE1,
image2:        TokensTable.IMAGE2,
image3:        TokensTable.IMAGE3,
image4:        TokensTable.IMAGE4,
"void":        TokensTable.VOID,
output:        TokensTable.OUTPUT,
evaluatePixel:    TokensTable.EVALUATE_PIXEL,
"if":        TokensTable.IF,
"else":        TokensTable.ELSE,
"const":      TokensTable.CONST,
"int":        TokensTable.INT,
int2:        TokensTable.INT2,
int3:        TokensTable.INT3,
int4:        TokensTable.INT4,
float:        TokensTable.FLOAT,
float2:        TokensTable.FLOAT2,
float3:        TokensTable.FLOAT3,
float4:        TokensTable.FLOAT4,
float2x2:      TokensTable.FLOAT2X2,
float3x3:      TokensTable.FLOAT3X3,
float4x4:      TokensTable.FLOAT4X4,
pixel1:        TokensTable.PIXEL1,
pixel2:        TokensTable.PIXEL2,
pixel3:        TokensTable.PIXEL3,
pixel4:        TokensTable.PIXEL4  };
public function PBLexer( source_name: String, input: String )
{
super( source_name, input );
addRule( "nl",      "\n",            -1,          RegexLexer.NL );
addRule( "space",    "[ \t]+",           -1,          RegexLexer.SKIP );
addRule( "comment",    "//.*",           -1,          RegexLexer.SKIP );
addRule( "start_cmt",  "/\\*",           -1,          RegexLexer.START_EAT );
addRule( "stop_cmt",  "\\*/",           -1,          RegexLexer.STOP_EAT );
addRule( "ident",    "[a-zA-Z_][a-zA-Z_0-9]*",  TokensTable.IDENT,  onIdent );
addRule( "number",    "0|([1-9][0-9]*(\\.[0-9]*)?)",  TokensTable.NUMBER, onNumber );
addRule( "string",    "\"(\\\\\"|[^\"])+\"",    TokensTable.STRING, onString );
addRule( "symbol",    "\\+\\+|\\-\\-|< =|>=|==|" +
"!=|&amp;&amp;|\\|\\||\\*=|/=|" +
"\\+=|\\-=|\\(|\\)|\\*|" +
"\\+|,|\\-|\\.|/|:|;|#|" +
"\\< |=|\\>|\\{|\\}|\\[|" +
"\\]|\\?|!",          -1,          onSymbol );
}
private function onSymbol( context: RegexLexerContext ): void
{
var token: Token;
token = new Token(
context.token.value.charCodeAt( 0 ),
context.token.value,
context.token.sourceName,
context.token.charno,
context.token.lineno,
context.token.columnno );
context.token = token;
}
private function onIdent( context: RegexLexerContext ): void
{
var type: int;
var token: Token;
type = context.token.type;
if( keyword_map[ context.token.value ] )
{
type = keyword_map[ context.token.value ];
}
token = new Token(
type,
context.token.value,
context.token.sourceName,
context.token.charno,
context.token.lineno,
context.token.columnno );
context.token = token;
}
private function onNumber( context: RegexLexerContext ): void
{
var token: Token;
var value: Number;
value = parseFloat( context.token.value );
token = new Token(
context.token.type,
value,
context.token.sourceName,
context.token.charno,
context.token.lineno,
context.token.columnno );
context.token = token;
}
private function onString( context: RegexLexerContext ): void
{
var token: Token;
var value: String;
value = context.token.value.substr( 1, context.token.value.length - 2 );
token = new Token(
context.token.type,
value,
context.token.sourceName,
context.token.charno,
context.token.lineno,
context.token.columnno );
context.token = token;
}
}
}

http://www.iskipper.fr/?doctoral-dissertation-enhancement-projects-ddep Doctoral Dissertation Enhancement Projects Ddep There are some standard callbacks:

  • RegexLexer.NL: tells the Lexer that a new line token have been matched. This action increase an internal counter that keeps track of the line number;
  • RegexLexer.SKIP: skip the current token;
  • RegexLexer.START_EAT: start eating the tokens;
  • The Fall Of The Roman Empire Essay RegexLexer.STOP_EAT: stop eating the tokens;

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package {
import flash.display.Sprite;
import it.sephiroth.scripting.utils.Token;
import test.PBLexer;
public class test extends Sprite
{
private static var INPUT: XML = <input />< ![CDATA[
/*****************************************************************************
*
* Copyright (C) 2008 Adobe Systems Incorporated
* All Rights Reserved.
*
* NOTICE:  All information contained  herein is,  and remains the property of
* Adobe Systems Incorporated and its suppliers, if any.  The intellectual and
* technical  concepts  contained  herein  are  proprietary  to  Adobe Systems
* Incorporated  and  its suppliers  and may  be covered  by U.S.  and Foreign
* Patents, patents in process, and are protected by trade secret or copyright
* law.  Dissemination of this information or reproduction of this material is
* strictly forbidden  unless prior  written permission is obtained from Adobe
* Systems Incorporated.
*
*****************************************************************************/
<languageVersion: 1.0;>
// basicBoxBlur: A simple example to demonstrate how to implement a 1
//                iteration box blur.  The kernel is a good example to
//                demonstrate how to implement a convolution using for loops.
kernel basicBoxBlur
< namespace : "AIF";
vendor : "Adobe Systems";
version : 2;
description : "variable Radius Box Blur"; >
{
// A parameter that represents the radius of the blur in both the X and Y
// directions.
parameter float blurRadius
< minValue:float(0.0);
maxValue:float(25.0);
defaultValue:float(5.0);
>;
// A dependent value.  These are calculated in the evaluateDependents()
// function and save us from having to perform repetitive calculations
// for each pixel.
dependent int radiusAsInt;
// evaluateDependents(): Built-in function to do any pre-processing of the
//                       parameters.  Usage of this function helps avoid
//                       repeating any necessary instructions per pixel.
//                       In a filter as simple as this, the extra cycles
//                       are probably not necessary, but it serves as a
//                       good example.
void
evaluateDependents()
{
// Convert the dimension into a integer value for use in the iteration
// over the kernel window.  All type conversions are required to be
// explicit.
radiusAsInt = int(ceil(blurRadius));
}
input image4 src;
output float4 dst;
// Region functions are not available in Flash targets, so we only define
// the functions if we are executing on a different backend.
#if !AIF_FLASH_TARGET
// needed(): Indicates what area of the input is needed to fulfill the
//           requested output region.  In this case, we consider a
//           radius sized area of the input for each output pixel, so we
//           need to outset the area by one.
region needed(region outputRegion, imageRef inputRef)
{
float2 singlePixel = pixelSize(src);
return outset(outputRegion, float2(singlePixel.x * ceil(blurRadius), singlePixel.y * ceil(blurRadius)));
}
// changed(): Indicates what area of the output is affected by the
//            specified input.  In this case, we will blur out the image
//            by the size of the radius, so the output is the input outset by
//            one.
region changed(region inputRegion, imageRef inputRef)
{
float2 singlePixel = pixelSize(src);
return outset(inputRegion, float2(singlePixel.x * ceil(blurRadius), singlePixel.y * ceil(blurRadius)));
}
#endif
// evaluatePixel(): The function of the filter that actually does the
//                  processing of the image.  This function is called once
//                  for each pixel of the output image.
void
evaluatePixel()
{
// Containers for both the accumulated color as well as the number of
// pixels touched.
float denominator = 0.0;
float4 colorAccumulator = float4(0.0, 0.0, 0.0, 0.0);
float2 singlePixel = pixelSize(src);
// Iterate through the kernel window, adding up the samples in
// that location.
for(int i = -radiusAsInt; i < = radiusAsInt; i++)
{
for(int j = -radiusAsInt; j <= radiusAsInt; j++)
{
colorAccumulator += sampleNearest(src,
outCoord() + float2(float(i) * singlePixel.x, float(j) * singlePixel.y));
denominator++;
}
}
// calculate the resultant pixel value which is the accumulated color
// divided by the total number of pixels.
// In this case, the denominator is 9.
dst = colorAccumulator / denominator;
}
}
]]>
public function test()
{
super();
var token: Token;
var lexer: PBLexer;
lexer = new PBLexer( "<file>", INPUT.text() );
while( token = lexer.next() )
{
if( token.type == Token.EOF )
{
break;
}
trace( token );
}
}
}
}</file>

Next week we will move further and start discussing the grammar, implementing a simple Parser using a custom version of Yacc that generates ActionScript code.

  • hbb

    eh…do you want to design a program language by actionscript base on flashplayer?

  • Well, sort of – read the previous posts for an introduction