Class: Applesoft

Inherits:
NativeFileType show all
Defined in:
lib/native_file_types/apple2/Applesoft.rb

Constant Summary collapse

APPLESOFT_TOKENS = 
[
    "END","FOR","NEXT","DATA","INPUT","DEL","DIM","READ",
		"GR","TEXT","PR#","IN#","CALL","PLOT","HLIN","VLIN",
		"HGR2","HGR","HCOLOR=","HPLOT","DRAW","XDRAW","HTAB",
		"HOME","ROT=","SCALE=","SHLOAD","TRACE","NOTRACE",
		"NORMAL","INVERSE","FLASH","COLOR=","POP","VTAB",
		"HIMEM=","LOMEM=","ONERR","RESUME","RECALL","STORE",
		"SPEED=","LET","GOTO","RUN","IF","RESTORE","&","GOSUB",
		"RETURN","REM","STOP","ON","WAIT","LOAD","SAVE","DEF",
		"POKE","PRINT","CONT","LIST","CLEAR","GET","NEW",
		"TAB(","TO","FN","SPC(","THEN","AT","NOT","STEP","+",
		"-","*","/","^","AND","OR",">","=","<","SGN","INT",
		"ABS","USR","FRE","SCRN(","PDL","POS","SQR","RND",
		"LOG","EXP","COS","SIN","TAN","ATN","PEEK","LEN",
		"STR$","VAL","ASC","CHR$", "LEFT$","RIGHT$","MID$","?",
		"?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?","?"
]

Instance Attribute Summary

Attributes inherited from NativeFileType

#aux_code, #contents, #file_system_image, #file_type, #filename, #meta_data

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from NativeFileType

#<=>, #==, all_native_file_types, best_fit, code_for_tests, compatability_score, #data_without_header, file_type_matches?, #full_filename, #header_length, #initialize, is_valid_file_if, #load_address, load_address, matching_score, native_file_types_possible_on_file_system, non_matching_score, #to_hex_dump, #to_info_dump, #type_description

Methods included from SubclassTracking

extended

Constructor Details

This class inherits a constructor from NativeFileType

Class Method Details

.file_system_file_types ⇒ Object 



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# File 'lib/native_file_types/apple2/Applesoft.rb', line 4

def self.file_system_file_types
  {
    AppleDos=>0x02,
    ProDos=>0xFC
  }
end

Instance Method Details

#to_listing ⇒ Object 



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# File 'lib/native_file_types/apple2/Applesoft.rb', line 29

def to_listing
# Adapted from FID.C -- a utility to browse Apple II .DSK image files by Paul Schlyter ([email protected])
#
#Applesoft file format:
# <Length_of_file> (16-bit little endian) (only for Apple DOS files - these 2 bytes are not present in Applesoft file on ProDOS)
# <Line>
# ......
# <Line>
# where <Line> is:
# <Next addr>  (16-bit little endian)
# <Line no>    (16-bit little endian: 0-65535)
# <Tokens and/or characters>
# <End-of-line marker: $00 >
#
 if (file_system_image.file_system)==AppleDos then
   length=contents[0]+contents[1]*256
   index=2
 else
   length=contents.length
   index=0

 end
	s=""
	while (index<length)
		index+=2 #skip over the "next address" field
		break if contents[index].nil?
		break if contents[index+1].nil?
		line_no=contents[index]+contents[index+1]*256
		index+=2 #skip over the "line number" field
		s+=sprintf("%u",line_no)
		done_line=false
		last_char_space=false
     inside_quotes=true
		while (!done_line)			
			b=contents[index]
			break if b.nil?
       inside_quotes=!inside_quotes if b==0x22 
			if b>=0x80 then
         if inside_quotes then
           if !last_char_space then
             s+=" "
           end
           s+=APPLESOFT_TOKENS[b-0x80]+" "
           last_char_space=true
         else
           s+=(b-0x80).chr  #if we're inside quotes, bytes >80 are inverse text. but we'll just display them as normal text
         end
			else
				s+=b.chr
				last_char_space=false
			end
			index+=1
			done_line=(index>=length)||(contents[index]==0)
		end
		s+="\n"
		index+=1        # skip over "end of line" marker
	end
       #s
        s
end