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formats.js
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"use strict";
var
/**@const */
MIN_BUFFER_SIZE=0x100,
/**
* A
*@const
*/
MAX_BUFFER_SIZE=0x1000000,
/**
* An estimated guess for the density of a Life pattern, in alive/cell
*@const
*/
DENSITY_ESTIMATE=.009;
varformats=(function()
{
return{
parse_rle:parse_rle,
//parse_life105: parse_life105,
//parse_life106: parse_life106,
//parse_plaintext: parse_plaintext,
parse_pattern:parse_pattern,
rule2str:rule2str,
parse_rule:parse_rule,
parse_comments:parse_comments,
generate_rle:generate_rle,
};
functionparse_rle(pattern_string)
{
var
result=parse_comments(pattern_string,"#"),
x=0,y=0,
header_match,
expr=/([a-zA-Z]+)*=*([a-zA-Z0-9\/()]+)/g,
match;
pattern_string=result.pattern_string;
varpos=pattern_string.indexOf("\n");
if(pos===-1)
{
return{error :"RLE Syntax Error: No Header"};
}
while(header_match=expr.exec(pattern_string.substr(0,pos)))
{
switch(header_match[1])
{
case"x":
result.width=Number(header_match[2]);
break;
case"y":
result.height=Number(header_match[2]);
break;
case"rule":
result.rule_s=parse_rule_rle(header_match[2],true);
result.rule_b=parse_rule_rle(header_match[2],false);
result.comment+="\nRule: "+rule2str(result.rule_s,result.rule_b)+"\n";
result.rule=rule2str(result.rule_s,result.rule_b);
break;
case"alpha":
case"color":
break;
default:
//console.log(header_match);
return{error :"RLE Syntax Error: Invalid Header: "+header_match[1]};
}
}
/*
Today I learned:
Optimize a certain string parsing algorithm (1 Megabyte input).
Timings:
1. using while(str = str.replace(re, callback)): Over 9000
2. using while(match = re.exec(str)): 800ms
3. using for(var pos = 0; pos < str.length; pos++) chr = str[pos]: 750ms
4. using for(var pos = 0; pos < str.length; pos++) chr = str.charCodeAt(pos): 50ms
=> re.exec is way faster than str.replace (obviously)
=> parsing character by character with str comparisons is same speed as re.exec
=> number comparisons are way faster than single character comparisons
*/
//console.time("parse rle");
varinitial_size=MIN_BUFFER_SIZE;
if(result.width&&result.height)
{
varsize=result.width*result.height;
if(size>0)
{
initial_size=Math.max(initial_size,size*DENSITY_ESTIMATE|0);
initial_size=Math.min(MAX_BUFFER_SIZE,initial_size);
}
}
varcount=1,
in_number=false,
chr,
field_x=newInt32Array(initial_size),
field_y=newInt32Array(initial_size),
alive_count=0,
len=pattern_string.length;
for(;pos<len;pos++)
{
chr=pattern_string.charCodeAt(pos);
if(chr>=48&&chr<=57)
{
if(in_number)
{
count*=10;
count+=chr^48;
}
else
{
count=chr^48;
in_number=true;
}
}
else
{
if(chr===98)// b
{
x+=count;
}
elseif(chr>=65&&chr<=90||chr>=97&&chr<122)// A-Za-z
{
if(alive_count+count>field_x.length)
{
field_x=increase_buf_size(field_x);
field_y=increase_buf_size(field_y);
}
while(count--)
{
field_x[alive_count]=x++;
field_y[alive_count]=y;
alive_count++;
}
}
elseif(chr===36)// $
{
y+=count;
x=0;
}
elseif(chr===33)// !
{
break;
}
count=1;
in_number=false;
}
}
//console.timeEnd("parse rle");
//console.log(initial_size, alive_count);
result.field_x=newInt32Array(field_x.buffer,0,alive_count);
result.field_y=newInt32Array(field_y.buffer,0,alive_count);
returnresult;
}
functionincrease_buf_size(buffer)
{
varnew_buffer=newInt32Array(buffer.length*1.5|0);
new_buffer.set(buffer);
returnnew_buffer;
}
functionparse_life105(pattern_string)
{
varresult=parse_comments(pattern_string,"#");
// defunctional now
// parsing this is similiar to plaintext
returnresult;
}
functionparse_life106(pattern_string)
{
// a list of coordinates essentially
varexpr=/\s*(-?\d+)\s+(-?\d+)\s*(?:\n|$)/g,
match,
field_x=[],
field_y=[];
while(match=expr.exec(pattern_string))
{
field_x.push(Number(match[1]));
field_y.push(Number(match[2]));
}
return{
field_x:field_x,
field_y:field_y,
};
}
functionparse_plaintext(pattern_string)
{
varresult=parse_comments(pattern_string,"!");
pattern_string=result.pattern_string;
varfield_x=[],
field_y=[],
x=0,
y=0,
len=pattern_string.length;
for(vari=0;i<len;i++)
{
switch(pattern_string[i])
{
case".":
x++;
break;
case"O":
field_x.push(x++);
field_y.push(y);
break;
case"\n":
y++;
x=0;
break;
case"\r":
case" ":
break;
/*case "":
return result;
break;*/
default:
//console.log("Plaintext: Syntax Error");
return{error :"Plaintext: Syntax Error"};
}
}
result.field_x=field_x;
result.field_y=field_y;
returnresult;
}
functionparse_comments(pattern_string,comment_char)
{
varresult={
comment:"",
urls:[],
short_comment:"",
},
nl,
line,
cont,
advanced=comment_char==="#";
while(pattern_string[0]===comment_char)
{
nl=pattern_string.indexOf("\n");
line=pattern_string.substr(1,nl-1);
cont=true;
if(advanced)
{
line=line.substr(1).trim();
switch(pattern_string[1])
{
case"N":
if(line)
{
result.title=line;
}
else
{
result.rule="23/3";
}
cont=false;
break;
case"C":
case"D":
if(!result.short_comment)
{
result.short_comment=line;
}
break;
case"O":
result.author=line;
break;
case"R":
result.rule=line;
cont=false;
break;
//case "P":
// center of the pattern
// cont = false;
// break;
default:
cont=false;
}
}
if(cont)
{
if(/^(?:https?:\/\/|www\.)[a-z0-9]/i.test(line))
{
if(line.substr(0,4)!=="http")
{
line="http://"+line;
}
result.urls.push(line);
}
elseif(line.substr(0,5)==="Name:")
{
result.title=line.substr(5);
}
else
{
result.comment+=line;
if(nl!==70&&nl!==80)
{
result.comment+="\n";
}
}
}
pattern_string=pattern_string.substr(nl+1);
}
result.pattern_string=pattern_string;
result.comment=result.comment.trim();
returnresult;
}
functionparse_pattern(pattern_text)
{
pattern_text=pattern_text.replace(/\r/g,"");
if(pattern_text[0]==="!")
{
returnparse_plaintext(pattern_text);
}
elseif(/^(?:#[^\n]*\n)*\n*(?:(?:x|y|rule|color|alpha)*=*[a-z0-9\/(),]+,?*)+\s*\n/i.test(pattern_text))
{
returnparse_rle(pattern_text);
}
// defunctional
//else if(pattern_text.substr(0, 10) === "#Life 1.05")
//{
// importer = parse_life105;
//}
elseif(pattern_text.substr(0,10)==="#Life 1.06")
{
returnparse_life106(pattern_text);
}
else
{
return{error:"Format detection failed."};
}
}
functionrule2str(rule_s,rule_b)
{
varrule="";
for(vari=0;rule_s;rule_s>>=1,i++)
{
if(rule_s&1)
{
rule+=i;
}
}
rule+="/";
for(vari=0;rule_b;rule_b>>=1,i++)
{
if(rule_b&1)
{
rule+=i;
}
}
returnrule;
}
functionrule2str_rle(rule_s,rule_b)
{
letrule=formats.rule2str(rule_s,rule_b);
rule=rule.split("/");
rule=`B${rule[1]}/S${rule[0]}`;
returnrule;
}
functionparse_rule_rle(rule_str,survived)
{
rule_str=rule_str.split("/");
if(!rule_str[1])
{
returnfalse;
}
if(Number(rule_str[0]))
{
returnparse_rule(rule_str.join("/"),survived);
}
if(rule_str[0][0].toLowerCase()==="b")
{
rule_str.reverse();
}
returnparse_rule(rule_str[0].substr(1)+"/"+rule_str[1].substr(1),survived);
}
functionparse_rule(rule_str,survived)
{
varrule=0,
parsed=rule_str.split("/")[survived ?0 :1];
for(vari=0;i<parsed.length;i++)
{
varn=Number(parsed[i]);
if(isNaN(n)||rule&1<<n)
{
returnfalse;
}
rule|=1<<n;
}
returnrule;
}
function*rle_generator(life,bounds)
{
functionmake(length,is_empty)
{
console.assert(length>=0);
if(length===0)
{
return"";
}
letlength_tag="";
if(length>1)
{
length_tag=String(length);
}
returnlength_tag+(is_empty ?"b" :"o");
}
for(lety=bounds.top;y<=bounds.bottom;y++)
{
letstate_is_empty=true;
letrun_start=bounds.left;
for(letx=bounds.left;x<=bounds.right;x++)
{
constis_empty=!life.get_bit(x,y);
construn_length=x-run_start;
console.assert(run_length>=0);
if(state_is_empty!==is_empty)
{
yieldmake(run_length,state_is_empty);
run_start=x;
state_is_empty=is_empty;
}
}
if(!state_is_empty)
{
construn_length=bounds.right+1-run_start;
yieldmake(run_length,state_is_empty);
}
if(y!==bounds.bottom)
{
yield"$";
}
}
yield"!";
}
// implemented according to http://www.conwaylife.com/w/index.php?title=Run_Length_Encoded
functiongenerate_rle(life,name,comments)
{
constlines=[];
constMAX_LINE_LENGTH=70;
if(name)
{
lines.push("#N "+name);
}
lines.push.apply(lines,comments.map(c=>"#C "+c));
constroot=life.root;
constbounds=life.get_root_bounds();
{
constwidth=bounds.right-bounds.left+1;
constheight=bounds.bottom-bounds.top+1;
construle=rule2str_rle(life.rule_s,life.rule_b);
lines.push(`x =${width}, y =${height}, rule =${rule}`);
}
letcurrent_line="";
for(letfragmentofrle_generator(life,bounds))
{
if(current_line.length+fragment.length>MAX_LINE_LENGTH)
{
console.assert(fragment.length<MAX_LINE_LENGTH);
lines.push(current_line);
current_line="";
}
current_line+=fragment;
}
lines.push(current_line);
returnlines.join("\n");
}
})();