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operators.js
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operators.js
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let TrieMatch = require("./triematch.js");
//preparing the precedence table
let precedenceTable = `
^
*
/
%
-
+
||
&&
>=
<=
!=
==
>
<
SPACE LEFT
:
|
->
@
= LEFT
NEWLINE LEFT
; LEFT
`.trim().split(/\s*\n\s*\n\s*/).map((group,i)=>{
return group.trim().split("\n").map((line)=>{
let l = line.split(/\s+/);
let token = l[0] === "NEWLINE" ? "\n" : l[0] === "SPACE" ? " " : l[0];
if(l.length === 1){
return {
token,
precedence:i,
associativity:false
}
}else{
return {
token,
precedence:i,
associativity:true//left associative
}
}
});
}).reduce((acc,group)=>{
group.map((line)=>{
acc[line.token] = line;
});
return acc;
},{});
let operators = new TrieMatch(Object.keys(precedenceTable).filter(o=>o!=="\n"&&o!==" "));// \n is kinda treated specially
console.log(precedenceTable);
module.exports = {
maxMatch:operators.maxMatch.bind(operators),
precedenceTable
};