Remove unnecessary dependencies in asc bundle; Update dependencies

bin/asc.js

@@ -13,7 +13,8 @@
 
 const fs = require("fs");
 const path = require("path");
-const os = require("os");
+const utf8 = require("./util/utf8");
+const EOL = process.platform === "win32" ? "\r\n" : "\n";
 
 // Use distribution files if present, otherwise run the sources directly
 var assemblyscript, isDev;
@@ -152,7 +153,7 @@ exports.main = function main(argv, options, callback) {
   if (!callback) callback = function defaultCallback(err) {
     var code = 0;
     if (err) {
-      stderr.write(err.stack + os.EOL);
+      stderr.write(err.stack + EOL);
       code = 1;
     }
     return code;
@@ -160,7 +161,7 @@ exports.main = function main(argv, options, callback) {
 
   // Just print the version if requested
   if (args.version) {
-    stdout.write("Version " + exports.version + (isDev ? "-dev" : "") + os.EOL);
+    stdout.write("Version " + exports.version + (isDev ? "-dev" : "") + EOL);
     return callback(null);
   }
   // Print the help message if requested or no source files are provided
@@ -181,7 +182,7 @@ exports.main = function main(argv, options, callback) {
           for (let i = 0; i < indent; ++i) {
             line = " " + line;
           }
-          return os.EOL + line;
+          return EOL + line;
         }).join(""));
       } else {
         opts.push(text + option.desc);
@@ -197,7 +198,7 @@ exports.main = function main(argv, options, callback) {
       "          asc hello1.ts hello2.ts -b -O > hello.wasm",
       "",
       "Options:"
-    ].concat(opts).join(os.EOL) + os.EOL);
+    ].concat(opts).join(EOL) + EOL);
     return callback(null);
   }
 
@@ -566,7 +567,7 @@ exports.main = function main(argv, options, callback) {
             path.basename(sourceMapURL)
           ), JSON.stringify(sourceMap));
         } else {
-          stderr.write("Skipped source map (stdout already occupied)" + os.EOL);
+          stderr.write("Skipped source map (stdout already occupied)" + EOL);
         }
       }
     }
@@ -741,7 +742,7 @@ function checkDiagnostics(emitter, stderr) {
   while ((diagnostic = assemblyscript.nextDiagnostic(emitter)) != null) {
     stderr.write(
       assemblyscript.formatDiagnostic(diagnostic, stderr.isTTY, true) +
-      os.EOL + os.EOL
+      EOL + EOL
     );
     if (assemblyscript.isError(diagnostic)) hasErrors = true;
   }
@@ -803,24 +804,36 @@ function printStats(stats, output) {
     "Emit      : " + format(stats.emitTime, stats.emitCount),
     "Validate  : " + format(stats.validateTime, stats.validateCount),
     "Optimize  : " + format(stats.optimizeTime, stats.optimizeCount)
-  ].join(os.EOL) + os.EOL);
+  ].join(EOL) + EOL);
 }
 
 exports.printStats = printStats;
 
+var Buf = typeof global !== "undefined" && global.Buffer || Uint8Array;
+
 /** Creates a memory stream that can be used in place of stdout/stderr. */
 function createMemoryStream(fn) {
   var stream = [];
   stream.write = function(chunk) {
     if (typeof chunk === "string") {
-      this.push(Buffer.from(chunk, "utf8"));
-    } else {
-      this.push(chunk);
+      let buffer = new Buf(utf8.length(chunk));
+      utf8.write(chunk, buffer, 0);
+      chunk = buffer;
     }
+    this.push(chunk);
     if (fn) fn(chunk);
   };
   stream.toBuffer = function() {
-    return Buffer.concat(this);
+    var offset = 0, i = 0, k = this.length;
+    while (i < k) offset += this[i++].length;
+    var buffer = new Buf(offset);
+    offset = i = 0;
+    while (i < k) {
+      buffer.set(this[i], offset);
+      offset += this[i].length;
+      ++i;
+    }
+    return buffer;
   };
   stream.toString = function() {
     return this.toBuffer().toString("utf8");

bin/util/utf8.js

@@ -0,0 +1,46 @@
+// see: https://github.com/dcodeIO/protobuf.js/tree/master/lib/utf8
+
+exports.length = function utf8_length(string) {
+  var len = 0,
+    c = 0;
+  for (var i = 0; i < string.length; ++i) {
+    c = string.charCodeAt(i);
+    if (c < 128) {
+      len += 1;
+    } else if (c < 2048) {
+      len += 2;
+    } else if ((c & 0xFC00) === 0xD800 && (string.charCodeAt(i + 1) & 0xFC00) === 0xDC00) {
+      ++i;
+      len += 4;
+    } else {
+      len += 3;
+    }
+  }
+  return len;
+};
+
+exports.write = function utf8_write(string, buffer, offset) {
+  var start = offset,
+      c1, c2;
+  for (var i = 0; i < string.length; ++i) {
+    c1 = string.charCodeAt(i);
+    if (c1 < 128) {
+      buffer[offset++] = c1;
+    } else if (c1 < 2048) {
+      buffer[offset++] = c1 >> 6 | 192;
+      buffer[offset++] = c1 & 63 | 128;
+    } else if ((c1 & 0xFC00) === 0xD800 && ((c2 = string.charCodeAt(i + 1)) & 0xFC00) === 0xDC00) {
+      c1 = 0x10000 + ((c1 & 0x03FF) << 10) + (c2 & 0x03FF);
+      ++i;
+      buffer[offset++] = c1 >> 18 | 240;
+      buffer[offset++] = c1 >> 12 & 63 | 128;
+      buffer[offset++] = c1 >> 6 & 63 | 128;
+      buffer[offset++] = c1 & 63 | 128;
+    } else {
+      buffer[offset++] = c1 >> 12 | 224;
+      buffer[offset++] = c1 >> 6 & 63 | 128;
+      buffer[offset++] = c1 & 63 | 128;
+    }
+  }
+  return offset - start;
+};