[js] Make nqp::stderr and nqp::stdout output to console.error and console.log

Author: pmurias

src/vm/js/nqp-runtime/browser.js

@@ -1,7 +1,64 @@
 const op = {};
+const Null = require('./null.js');
+const Hash = require('./hash.js');
+const core = require('./core.js');
+
 exports.op = op;
 
+class BufferedConsole {
+  constructor(output) {
+    this.buffered = [];
+    this.output = output;
+  }
+
+  $$writefh(buf) {
+    const buffer = core.toRawBuffer(buf);
+    this.$$write(buffer.toString());
+  }
+
+  $$write(str) {
+    const lines = str.split(/\n/);
+    if (lines.length === 0) return;
+    for (let i = 0; i < lines.length-1; i++) {
+      if (i === 0) {
+        this.output(this.buffered.join('') + lines[0]);
+        this.buffered.length = 0;
+      } else {
+        this.output(lines[i]);
+      }
+    }
+
+    if (lines[lines.length - 1] !== '') {
+      this.buffered.push(lines[lines.length - 1]);
+    }
+  }
+}
+
+const STDOUT = new BufferedConsole(output => console.log(output));
+const STDERR = new BufferedConsole(output => console.error(output));
+
 op.say = function(arg) {
-  console.log(arg);
+  STDOUT.$$write(arg + '\n');
+  return arg;
+};
+
+op.print = function(arg) {
+  STDOUT.$$write(arg);
   return arg;
 };
+
+op.getstdin = function(arg) {
+  return Null;
+};
+
+op.getstdout = function(arg) {
+  return STDOUT;
+};
+
+op.getstderr = function(arg) {
+  return STDERR;
+};
+
+op.getenvhash = function() {
+  return new Hash();
+};