Simple Preprocessor

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Problem

Preprocess all input lines using the following steps:

1. Trim all tabs and spaces from the beginning and end of the line
2. If the line is not empty and doesn't start with #, output the line.

Options

exec is denied

now post-mortem time, all source codes will be revealed

Sample input:_

#=======================================
#Preprocessor test file and preprocessor
#=======================================

#Define application attributes
*application 'preprocessor' has entry 'start' and has exit 'finish'
*functionality 'console'
*add module 'core'
*add module 'streams'
*add module 'strings'
	
#Define entry point
fixed function->start [no arguments, no value]   
	#Open standard input and output
	stream->stdin = getstd(0) 
	stream->stdout = getstd(1)
	#Loop until EOF
	fixed loop [exit on stdin@readline(empty) as string->line is null]	
	  	#Open an edit block to perform operations only on line	 	
		fixed edit line
			 #Remove all leading and trailing tabs and spaces 
			fixed loop [exit on @characters(0) as character->check is not in {' ','	'}, exit on @length@value as integer->size is not 0]
				@start@modify(@start@value + 1)
			complete
   	 	  	fixed loop [exit on @characters(@length@value - 1) as character->check is not in {' ','	'}, exit on @length@value as integer->size is not 0]  	
				@length@modify(@length@value - 1)	
			complete 				
		complete
		#Check if the line is not empty
        	fixed skip [execute on line@length@value as integer->temp is not 0]
			#Check if the line doesn't start with a hash symbol
			fixed skip [execute on line@characters(line@length@value - 1) as character->check is not '#']
				#Write the new line to the output
				stdout@writeline(line)
			complete
		complete
	complete
	#Close and finalize all streams
	stdin@close(empty)
        stdout@flush(empty)
	stdout@eof(empty)
	stdout@close(empty)
	#Clean all variables from memory
	destroy {stdin, stdout}
	#Exit the function	
	exit(empty)
complete
  	 
#Define exit point
fixed function->finish [no arguments, value is integer]
	#Return successful exit code
	exit(0)
complete

Sample output:

*application 'preprocessor' has entry 'start' and has exit 'finish'
*functionality 'console'
*add module 'core'
*add module 'streams'
*add module 'strings'
fixed function->start [no arguments, no value]
stream->stdin = getstd(0)
stream->stdout = getstd(1)
fixed loop [exit on stdin@readline(empty) as string->line is null]
fixed edit line
fixed loop [exit on @characters(0) as character->check is not in {' ','	'}, exit on @length@value as integer->size is not 0]
@start@modify(@start@value + 1)
complete
fixed loop [exit on @characters(@length@value - 1) as character->check is not in {' ','	'}, exit on @length@value as integer->size is not 0]
@length@modify(@length@value - 1)
complete
complete
fixed skip [execute on line@length@value as integer->temp is not 0]
fixed skip [execute on line@characters(line@length@value - 1) as character->check is not '#']
stdout@writeline(line)
complete
complete
complete
stdin@close(empty)
stdout@flush(empty)
stdout@eof(empty)
stdout@close(empty)
destroy {stdin, stdout}
exit(empty)
complete
fixed function->finish [no arguments, value is integer]
exit(0)
complete

Ranking

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Kite _

SNOBOL _

Icon _

J _

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C _

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REBOL _

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sed _

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Bash (builtins) _

wake _

xgawk _

Whitespace _

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FlogScript _

Vim _

Groovy _

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