View source for VGA Flag Language

The VGA Flag Language is a DSL for defining pride flags, to be used in VGAPride. 

=== Example flag script: ===
 $names=["demisexual"]
 $description="The Demisexual pride flag"
 // Unknown creator. Maybe research further?
 $textcolor=$black
 
 vertical{
 	RGB(255,255,255)
 	RGB(255,255,255)
 	RGB(110,  0,112)
 	RGB(210,210,210)
 	RGB(210,210,210)
 }
 
 Triangle (0,0), (240,240), (0,480), $black

=== Rendering context ===
Scripts generate a 640x480 image which uses a max of 16 colors. 

The only pre-defined color is 0, which is black. The other 15 colors will be allocated as they are used, and the compiler will throw an error if too many colors are used. 

The coordinate system is 0-639 horizontally, 0-479 vertically, starting in the top-left. 

=== Overall structure ===
The main elements of a script are '''comments''', '''variable declarations''', '''structures''', and '''commands'''.

'''Comments''' can start anywhere on a line and begin with // and continue to a newline. 

'''Variable declarations''' take the form $variable_name = SOMEVALUE (see Value Types below)

'''Structures''' are curly-brace delimited blocks which automatically generate rectangle commands based on colors. See Structures below.

'''Commands''' are functions which draw different shapes into the image. See Command List below.

=== Value Types ===
There are six value types used for variables:
{| class="wikitable"
|+
!Name
!Examples
!Description
|-
|Integers
|4
-5

+15
|Whole signed numbers, 16-bits. Used for text sizing and ellipse width/height.
|-
|Colors
|RGB(10,20,30)
<nowiki>#</nowiki>FF00FF
|A given color. Technically 6-bits-per-channel, but we're pretending they're not
|-
|Enumerations
|Filled
Medium

Outline
|Used for special values in commands
|-
|Strings
|"foobar"
'bazqux'
|A text string used for metadata
|-
|Points
|(10,25)
(-50, 500)
|A point is a geometric location made of two integers.
|-
|Lists
|["hello"]
[(25,0), (50,0)]
|A list is a static array of values. Only used for Points and Strings.
|}

=== Metadata ===
Some variable definitions are interpreted by VGAPride. These special definitions are: