fix #11: add text conversion polyfills for Edge

Author: hlorenzi

README.md

@@ -28,9 +28,9 @@ Usage: customasm [options] <asm-file-1> ... <asm-file-N>
 Options:
     -f, --format FORMAT The format of the output file. Possible formats:
                         binary, binstr, hexstr, bindump, hexdump,
-						mif, intelhex, deccomma, hexcomma, decc, hexc,
-						logisim8, logisim16
-						
+                        mif, intelhex, deccomma, hexcomma, decc, hexc,
+                        logisim8, logisim16
+                        
     -o, --output FILE   The name of the output file.
     -p, --print         Print output to stdout instead of writing to a file.
     -q, --quiet         Suppress progress reports.

web/customasm.gc.wasm

@@ -121,7 +121,7 @@ function assemble()
 
 	let divText = document.getElementById("divOutputText")
 	divText.innerHTML = output
-	divText.style.whiteSpace = (isError || format <= 1) ? "pre" : "no-wrap"
+	divText.style.whiteSpace = "no-wrap"
 }
 
 
@@ -130,7 +130,7 @@ function makeRustString(str)
 	//console.log("makeRustString")
 	//console.log(str)
 
-	let bytes = new TextEncoder("utf-8").encode(str)
+	let bytes = window.TextEncoder ? new TextEncoder("utf-8").encode(str) : stringToUtf8ByteArray(str)
 	//console.log(bytes)
 
 	let ptr = g_wasm.instance.exports.wasm_string_new(bytes.length)
@@ -157,7 +157,7 @@ function readRustString(ptr)
 
 	//console.log(bytes)
 
-	let str = new TextDecoder("utf-8").decode(new Uint8Array(bytes))
+	let str = window.TextDecoder ? new TextDecoder("utf-8").decode(new Uint8Array(bytes)) : utf8ByteArrayToString(bytes)
 	//console.log(str)
 	return str
 }
@@ -169,4 +169,64 @@ function dropRustString(ptr)
 	//console.log(ptr)
 
 	g_wasm.instance.exports.wasm_string_drop(ptr)
+}
+
+
+// From https://github.com/google/closure-library/blob/e877b1eac410c0d842bcda118689759512e0e26f/closure/goog/crypt/crypt.js#L115
+function stringToUtf8ByteArray(str)
+{
+	let out = [], p = 0
+	for (let i = 0; i < str.length; i++) {
+		let c = str.charCodeAt(i)
+		if (c < 128) {
+			out[p++] = c
+		} else if (c < 2048) {
+			out[p++] = (c >> 6) | 192
+			out[p++] = (c & 63) | 128
+		} else if (
+			((c & 0xFC00) == 0xD800) && (i + 1) < str.length &&
+			((str.charCodeAt(i + 1) & 0xFC00) == 0xDC00)) {
+			// Surrogate Pair
+			c = 0x10000 + ((c & 0x03FF) << 10) + (str.charCodeAt(++i) & 0x03FF)
+			out[p++] = (c >> 18) | 240
+			out[p++] = ((c >> 12) & 63) | 128
+			out[p++] = ((c >> 6) & 63) | 128
+			out[p++] = (c & 63) | 128
+		} else {
+			out[p++] = (c >> 12) | 224
+			out[p++] = ((c >> 6) & 63) | 128
+			out[p++] = (c & 63) | 128
+		}
+	}
+	return out
+}
+
+
+// From https://github.com/google/closure-library/blob/e877b1eac410c0d842bcda118689759512e0e26f/closure/goog/crypt/crypt.js#L149
+function utf8ByteArrayToString(bytes)
+{
+	let out = [], pos = 0, c = 0
+	while (pos < bytes.length) {
+		let c1 = bytes[pos++]
+		if (c1 < 128) {
+			out[c++] = String.fromCharCode(c1)
+		} else if (c1 > 191 && c1 < 224) {
+			let c2 = bytes[pos++]
+			out[c++] = String.fromCharCode((c1 & 31) << 6 | c2 & 63)
+		} else if (c1 > 239 && c1 < 365) {
+			// Surrogate Pair
+			let c2 = bytes[pos++]
+			let c3 = bytes[pos++]
+			let c4 = bytes[pos++]
+			let u = ((c1 & 7) << 18 | (c2 & 63) << 12 | (c3 & 63) << 6 | c4 & 63) - 0x10000
+			out[c++] = String.fromCharCode(0xD800 + (u >> 10))
+			out[c++] = String.fromCharCode(0xDC00 + (u & 1023))
+		} else {
+			let c2 = bytes[pos++]
+			let c3 = bytes[pos++]
+			out[c++] =
+				String.fromCharCode((c1 & 15) << 12 | (c2 & 63) << 6 | c3 & 63)
+		}
+	}
+	return out.join('')
 }