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Text encode decode #1645

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Text encode decode #1645

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70f3fdf
Compiler: mark TextEncoder as reserved
hhugo Jul 26, 2024
33074bd
Runtime: rely on TextEncoder and TextDecoder
hhugo Jul 26, 2024
9b2cea3
CR
hhugo Aug 2, 2024
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1 change: 1 addition & 0 deletions compiler/lib/reserved.ml
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Original file line number Diff line number Diff line change
Expand Up @@ -150,6 +150,7 @@ let provided =
; "Int32Array"
; "Int8Array"
; "TextDecoder"
; "TextEncoder"
; "Uint16Array"
; "Uint32Array"
; "Uint8Array"
Expand Down
136 changes: 35 additions & 101 deletions runtime/mlBytes.js
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Original file line number Diff line number Diff line change
Expand Up @@ -79,88 +79,6 @@ function caml_subarray_to_jsbytes (a, i, len) {
return s;
}

//Provides: caml_utf8_of_utf16
function caml_utf8_of_utf16(s) {
for (var b = "", t = b, c, d, i = 0, l = s.length; i < l; i++) {
c = s.charCodeAt(i);
if (c < 0x80) {
for (var j = i + 1; (j < l) && (c = s.charCodeAt(j)) < 0x80; j++);
if (j - i > 512) { t.substr(0, 1); b += t; t = ""; b += s.slice(i, j) }
else t += s.slice(i, j);
if (j == l) break;
i = j;
}
if (c < 0x800) {
t += String.fromCharCode(0xc0 | (c >> 6));
t += String.fromCharCode(0x80 | (c & 0x3f));
} else if (c < 0xd800 || c >= 0xdfff) {
t += String.fromCharCode(0xe0 | (c >> 12),
0x80 | ((c >> 6) & 0x3f),
0x80 | (c & 0x3f));
} else if (c >= 0xdbff || i + 1 == l ||
(d = s.charCodeAt(i + 1)) < 0xdc00 || d > 0xdfff) {
// Unmatched surrogate pair, replaced by \ufffd (replacement character)
t += "\xef\xbf\xbd";
} else {
i++;
c = (c << 10) + d - 0x35fdc00;
t += String.fromCharCode(0xf0 | (c >> 18),
0x80 | ((c >> 12) & 0x3f),
0x80 | ((c >> 6) & 0x3f),
0x80 | (c & 0x3f));
}
if (t.length > 1024) {t.substr(0, 1); b += t; t = "";}
}
return b+t;
}

//Provides: caml_utf16_of_utf8
function caml_utf16_of_utf8(s) {
for (var b = "", t = "", c, c1, c2, v, i = 0, l = s.length; i < l; i++) {
c1 = s.charCodeAt(i);
if (c1 < 0x80) {
for (var j = i + 1; (j < l) && (c1 = s.charCodeAt(j)) < 0x80; j++);
if (j - i > 512) { t.substr(0, 1); b += t; t = ""; b += s.slice(i, j) }
else t += s.slice(i, j);
if (j == l) break;
i = j;
}
v = 1;
if ((++i < l) && (((c2 = s.charCodeAt(i)) & -64) == 128)) {
c = c2 + (c1 << 6);
if (c1 < 0xe0) {
v = c - 0x3080;
if (v < 0x80) v = 1;
} else {
v = 2;
if ((++i < l) && (((c2 = s.charCodeAt(i)) & -64) == 128)) {
c = c2 + (c << 6);
if (c1 < 0xf0) {
v = c - 0xe2080;
if ((v < 0x800) || ((v >= 0xd7ff) && (v < 0xe000))) v = 2;
} else {
v = 3;
if ((++i < l) && (((c2 = s.charCodeAt(i)) & -64) == 128) &&
(c1 < 0xf5)) {
v = c2 - 0x3c82080 + (c << 6);
if (v < 0x10000 || v > 0x10ffff) v = 3;
}
}
}
}
}
if (v < 4) { // Invalid sequence
i -= v;
t += "\ufffd";
} else if (v > 0xffff)
t += String.fromCharCode(0xd7c0 + (v >> 10), 0xdc00 + (v & 0x3FF))
else
t += String.fromCharCode(v);
if (t.length > 1024) {t.substr(0, 1); b += t; t = "";}
}
return b+t;
}

//Provides: jsoo_is_ascii
function jsoo_is_ascii (s) {
// The regular expression gets better at around this point for all browsers
Expand Down Expand Up @@ -397,18 +315,23 @@ function caml_bytes_set (s, i, c) {
return caml_bytes_unsafe_set (s, i, c);
}

//Provides: jsoo_text_encoder
var jsoo_text_encoder = new TextEncoder ();

//Provides: jsoo_text_decoder
var jsoo_text_decoder = new TextDecoder ();

//Provides: caml_bytes_of_utf16_jsstring
//Requires: jsoo_is_ascii, caml_utf8_of_utf16, MlBytes
//Requires: MlBytes, jsoo_text_encoder
function caml_bytes_of_utf16_jsstring (s) {
var tag = 9 /* BYTES | ASCII */;
if (!jsoo_is_ascii(s))
tag = 8 /* BYTES | NOT_ASCII */, s = caml_utf8_of_utf16(s);
return new MlBytes(tag, s, s.length);
var a = jsoo_text_encoder.encode(s);
return new MlBytes(4, a, a.length);
}


//Provides: MlBytes
//Requires: caml_convert_string_to_bytes, jsoo_is_ascii, caml_utf16_of_utf8
//Requires: caml_convert_string_to_bytes, jsoo_is_ascii
//Requires: caml_uint8_array_of_bytes
//Requires: jsoo_text_decoder
function MlBytes (tag, contents, length) {
this.t=tag; this.c=contents; this.l=length;
}
Expand All @@ -429,9 +352,9 @@ MlBytes.prototype.toString = function(){
}
};
MlBytes.prototype.toUtf16 = function (){
var r = this.toString();
if(this.t == 9) return r
return caml_utf16_of_utf8(r);
if(this.t == 9) return this.c;
var a = caml_uint8_array_of_bytes(this);
return jsoo_text_decoder.decode(a);
}
MlBytes.prototype.slice = function (){
var content = this.t == 4 ? this.c.slice() : this.c;
Expand Down Expand Up @@ -726,21 +649,33 @@ function caml_string_of_jsbytes(x) { return x }
//If: js-string
function caml_jsbytes_of_string(x) { return x }

//Provides: jsoo_text_decoder_buff
var jsoo_text_decoder_buff = new ArrayBuffer(1024);

//Provides: caml_jsstring_of_string const
//Requires: jsoo_is_ascii, caml_utf16_of_utf8
//Requires: jsoo_is_ascii
//Requires: jsoo_text_decoder
//Requires: jsoo_text_decoder_buff
//If: js-string
function caml_jsstring_of_string(s) {
if(jsoo_is_ascii(s))
return s;
return caml_utf16_of_utf8(s); }
if(jsoo_is_ascii(s)) return s;
var a =
(s.length <= jsoo_text_decoder_buff.length)
? Uint8Array(jsoo_text_decoder_buff, 0, s.length)
: (new Uint8Array(s.length));
for(var i = 0; i < s.length; i++){
a[i] = s.charCodeAt(i);
}
return jsoo_text_decoder.decode(a);
}

//Provides: caml_string_of_jsstring const
//Requires: jsoo_is_ascii, caml_utf8_of_utf16, caml_string_of_jsbytes
//Requires: caml_string_of_array
//Requires: jsoo_text_encoder
//If: js-string
function caml_string_of_jsstring (s) {
if (jsoo_is_ascii(s))
return caml_string_of_jsbytes(s)
else return caml_string_of_jsbytes(caml_utf8_of_utf16(s));
var a = jsoo_text_encoder.encode(s);
return caml_string_of_array(a);
}

//Provides: caml_bytes_of_jsbytes const
Expand Down Expand Up @@ -852,7 +787,6 @@ function caml_ml_bytes_content(s) {
}

//Provides: caml_is_ml_string
//Requires: jsoo_is_ascii
//If: js-string
function caml_is_ml_string(s) {
return (typeof s === "string" && !/[^\x00-\xff]/.test(s));
Expand Down
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