info and print constraints added

cli.js

@@ -183,7 +183,31 @@ generate call parameters
 
         Default: public.json
 
+circuit info
+============
 
+    snarkjs info <options>
+
+    Print statistics of a circuit
+
+    -c or --circuit <circuitFile>
+
+        Filename of the compiled circuit file generated by circom.
+
+        Default: circuit.json
+
+print constraints
+=================
+
+    snarkjs printconstraints <options>
+
+    Print all the constraints of a given circuit
+
+    -c or --circuit <circuitFile>
+
+        Filename of the compiled circuit file generated by circom.
+
+        Default: circuit.json
         `)
     .alias("c", "circuit")
     .alias("pk", "provingkey")
@@ -219,7 +243,23 @@ function p256(n) {
 }
 
 try {
-    if (argv._[0].toUpperCase() == "SETUP") {
+    if (argv._[0].toUpperCase() == "INFO") {
+        const cirDef = JSON.parse(fs.readFileSync(circuitName, "utf8"));
+        const cir = new zkSnark.Circuit(cirDef);
+
+        console.log(`# Wires: ${cir.nVars}`);
+        console.log(`# Constraints: ${cir.nConstraints}`);
+        console.log(`# Private Inputs: ${cir.nPrvInputs}`);
+        console.log(`# Public Inputs: ${cir.nPubInputs}`);
+        console.log(`# Outputs: ${cir.nOutputs}`);
+
+    } else if (argv._[0].toUpperCase() == "PRINTCONSTRAINTS") {
+        const cirDef = JSON.parse(fs.readFileSync(circuitName, "utf8"));
+        const cir = new zkSnark.Circuit(cirDef);
+
+        cir.printConstraints();
+
+    } else if (argv._[0].toUpperCase() == "SETUP") {
         const cirDef = JSON.parse(fs.readFileSync(circuitName, "utf8"));
         const cir = new zkSnark.Circuit(cirDef);
         const setup = zkSnark.setup(cir);
@@ -322,7 +362,7 @@ try {
         const public = unstringifyBigInts(JSON.parse(fs.readFileSync(publicName, "utf8")));
         const proof = unstringifyBigInts(JSON.parse(fs.readFileSync(proofName, "utf8")));
 
-        inputs = "";
+        let inputs = "";
         for (let i=0; i<public.length; i++) {
             if (inputs != "") inputs = inputs + ",";
             inputs = inputs + p256(public[i]);

src/circuit.js

@@ -93,24 +93,38 @@ module.exports = class Circuit {
         const lc2str = (lc) => {
             let S = "";
             for (let k in lc) {
-                const name = this.signals[k].names[0];
+                let name = this.signals[k].names[0];
+                if (name == "one") name = "";
                 let v = bigInt(lc[k]);
                 let vs;
                 if (!v.lesserOrEquals(__P__.shr(bigInt(1)))) {
                     v = __P__.sub(v);
                     vs = "-"+v.toString();
                 } else {
-                    vs = "+"+v.toString();
+                    if (S!="") {
+                        vs = "+"+v.toString();
+                    } else {
+                        vs = "";
+                    }
+                    if (vs!="1") {
+                        vs = vs + v.toString();;
+                    }
                 }
 
                 S= S + " " + vs + name;
             }
             return S;
-        }
-        const S = `[ ${lc2str(c[0])} ] * [ ${lc2str(c[1])} ] - [ ${lc2str(c[2])} ]`;
+        };
+        const S = `[ ${lc2str(c[0])} ] * [ ${lc2str(c[1])} ] - [ ${lc2str(c[2])} ] = 0`;
         console.log(S);
     }
 
+    printConstraints() {
+        for (let i=0; i<this.constraints.length; i++) {
+            this.printCostraint(this.constraints[i]);
+        }
+    }
+
     getSignalIdx(name) {
         if (typeof(this.signalName2Idx[name]) != "undefined") return this.signalName2Idx[name];
         if (!isNaN(name)) return Number(name);