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pong_infix_loop.js
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pong_infix_loop.js
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start
= (statement)*
statement =
(w newline)* value:(binding / low / high / primary ) (w newline)*
{return {token:'statement', value:value}}
binding =
w left:symbol w ':' w right:(low / high / primary) {return {token:'binding', left:left, right:right}}
high
= first:primary rest:highpair+ {return {token: 'high', first:first, rest:rest}}
low
= first:(high / primary) rest:lowpair+ {return {token: 'low', first:first, rest:rest}}
primary
= (vector / symbol / parenthesis_group )
parenthesis_group = w "(" w value:(low / high / primary ) w ")" w {return {token: 'group', value:value}}
highpair = ( w op:highop w val:primary ) {return {op:op, value:val}}
lowpair = (w op:lowop w val:(high / primary) ) {return {op:op, value:val}}
highop = (mult / div / mod)
lowop = (add / sub )
mod = "%" {return "mod"}
div = "/" {return "div"}
mult= "*" {return "mult"}
add = "+" {return "add"}
sub = "-" {return "sub"}
vector =
w vals:(dval)+ w {
rect = {};
for (i=0; i<vals.length; i++){
v = vals[i];
rect[v.attr] = v.val;
}
return {token:'vector', value:rect}
}
dval
= w val:number symbol:symbol w {return {val:val, attr:symbol.value} }
symbol = w v:[a-z_]+ w {return {token:'symbol', value:v.join('')}}
core = w v:[A-Z_]+ w {return {token:'core', value:v.join('')}}
number
= w number:(float / integer) w
{return number}
float
= sign:"-"?
before:[0-9]* "." after:[0-9]+ {
return parseFloat(sign+before.join("") + "." + after.join(""));
}
integer
= sign:"-"?
digits:[0-9]+ {
return parseInt(sign+digits.join(""), 10);
}
w
= string:(" " / tab )* {return string.join('')}
newline =
[\n] {return "\n" }
tab =
[\t] {return "\t" }