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#!/usr/bin/env node
const fs=require("fs");
function print(/*arguments*/){
process.stdout.write.apply(process.stdout,arguments);
}
function pad(s,w,c){
s=s+"";
if(s.length>=Math.abs(w))return s;
if(w<0)return s+Array(-w-s.length+1).join(c?c:" ");
else return Array(w-s.length+1).join(c?c:" ")+s;
}
function readopmap(fname){
let table=String(fs.readFileSync(fname)).split("\n");
let i;
for(i=0;i<table.length;i++){
if(/Oper.*Prec.*Assoc/.test(table[i]))break;
}
let header=table[i];
table=table.slice(i+1);
for(i=0;i<table.length;i++){
if(table[i].length==0)break;
}
table=table.slice(0,i);
let opsidx=header.indexOf("Oper"),
precidx=header.indexOf("Prec"),
associdx=header.indexOf("Assoc");
let opmap={};
for(let row of table){
let ops=row.slice(opsidx,precidx).trim().split(" "),
prec=parseInt(row.slice(precidx,associdx).trim(),10),
assoc=row.slice(associdx).replace(/ *([^ ]+).*/,"$1");
for(let op of ops){
opmap[op]={prec,assoc};
}
}
return opmap;
}
function outputfunc(_ /*opmap,name,gen,padw,dolen,rettype,defval,checkend*/){
let opmap=_.opmap, name=_.name, gen=_.gen,
padw=_.padw, dolen=_.dolen, rettype=_.rettype,
defval=_.defval, checkend=_.checkend;
print("\n"+rettype+" "+name+"(const char *op"+(dolen?",const int len":"")+"){\n");
if(dolen)print("\tif(len<=0)return "+defval+";\n");
print("\tswitch(op[0]){\n");
let firstchars={};
for(let k in opmap){
if(firstchars[k[0]])firstchars[k[0]].push(k);
else firstchars[k[0]]=[k];
}
let arr=[];
for(k in firstchars){
arr.push([k,firstchars[k].sort(function(a,b){
return b.length-a.length;
})]);
}
arr=arr.sort();
for(let tup of arr){
let k=tup[0],ops=tup[1];
print("\t\tcase '"+k+"': return ");
let expr="";
for(let op of ops){
let cond;
if(dolen){
cond="len=="+op.length;
for(j=1;j<op.length;j++)cond+="&&op["+j+"]=='"+op[j]+"'";
} else {
cond="";
for(j=1;j<op.length;j++)cond+="op["+j+"]=='"+op[j]+"'&&";
if(checkend)cond+="!op["+j+"]";
else cond=cond.slice(0,-2);
if(cond=="")cond="true";
}
expr+=cond+"?"+pad(gen(op,opmap[op]),padw)+":";
}
expr+=defval;
expr=expr.replace(/true\?([^:]*):[^)]*/,"$1");
print(expr+";\n");
}
print("\t\tdefault: return "+defval+";\n");
print("\t}\n");
print("}\n");
}
const opmap=readopmap("LANGUAGE.txt");
const assocenum={
"Prefix": "AS_PREFIX", "Suffix": "AS_SUFFIX",
"Left": "AS_LEFT", "Right": "AS_RIGHT",
"Nonassociative": "AS_NONASSOC"
};
print("#include <stddef.h>\n\n");
print("#include \"opfuncs.h\"\n");
print("#include \"parser.h\"\n");
function alsolen(_){
outputfunc(_);
_.name+="_len";
_.dolen=true;
outputfunc(_);
}
alsolen({
opmap:opmap,
name:"precedence",
gen:(op,o)=>o.prec,
padw:2,
dolen:false,
rettype:"int",
defval:"-1",
checkend:true
});
alsolen({
opmap:opmap,
name:"associativity",
gen:(op,o)=>assocenum[o.assoc],
padw:-11,
dolen:false,
rettype:"int",
defval:"-1",
checkend:true
});
outputfunc({
opmap:opmap,
name:"parseoplength",
gen:(op,o)=>op.length,
padw:1,
dolen:false,
rettype:"int",
defval:"-1",
checkend:false
});
outputfunc({
opmap:opmap,
name:"opconststring_len",
gen:(op,o)=>'"'+op+'"',
padw:3,
dolen:true,
rettype:"const char*",
defval:"NULL",
checkend:true
});
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