Difference between revisions of "Macro Functions"

From GiderosMobile
Line 17: Line 17:
 
To call macro function use it's name with parenthesis as with usual functions:<br />
 
To call macro function use it's name with parenthesis as with usual functions:<br />
 
name(...arguments...)<br /><br />
 
name(...arguments...)<br /><br />
 +
=== Examples ===
 +
'''Enumeration'''<br/>
 +
<source lang="lua"><br />
 +
enum @ (|
 +
local t = ...
 +
local r = {}
 +
for i = 1, #t, 2 do
 +
table.insert(r, t[i] .. " @ " .. i // 2 + 1)
 +
end
 +
print(table.concat(r, " "))
 +
return table.concat(r, " ")
 +
|)
 +
 +
enum(apple, orange, melon)
 +
print(apple, orange, melon) --> 1 2 3</source>
 +
'''Turning off the print command'''<br/>
 +
<source lang="lua"><br />
 +
print @ (| return "" |)</source>
 +
'''Unroll loops'''<br/>
 +
<source lang="lua"><br />
 +
dotimes @ (|
 +
local times = table.remove(..., 1)
 +
return (table.concat(..., " ").." "):rep(times)
 +
|)
 +
 +
local t = {}
 +
 +
dotimes(10 print "Boom!")</source>
 
{|-
 
{|-
 
| style="width: 50%;"|
 
| style="width: 50%;"|

Revision as of 10:45, 23 August 2018

Supported platforms: android, ios, mac, pc
Available since: Gideros 2017.10

Description


Macro Functions receive a list of tokens and output a string which will be pasted into code at compile time.

name @ (| ...body... |)

You should use parenthesis around markers - '|' is the preferred marker. The same marker should be used to close macro body with closing parenthesis right after it. You can use any of these markers.
\`~ ! # $ % ^ & * / + = |

You can redefine a macro with @@.
name @@ (| ...another_body... |)

To call macro function use it's name with parenthesis as with usual functions:
name(...arguments...)

Examples

Enumeration

<br /> 
enum @ (|
	local t = ...
	local r = {}
	for i = 1, #t, 2 do
		table.insert(r, t[i] .. " @ " .. i // 2 + 1)
	end
	print(table.concat(r, " "))
	return table.concat(r, " ")
|)
 
enum(apple, orange, melon)
print(apple, orange, melon) --> 1 2 3

Turning off the print command

<br /> 
print @ (| return "" |)

Unroll loops

<br /> 
dotimes @ (|
	local times = table.remove(..., 1)
	return (table.concat(..., " ").." "):rep(times)
|)
 
local t = {}
 
dotimes(10 print "Boom!")

Methods

Events

Constants