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authordaurnimator <quae@daurnimator.com>2018-01-07 01:43:59 +1100
committerdaurnimator <quae@daurnimator.com>2018-01-07 01:43:59 +1100
commit90649345e011cdb998efe216f5e94a38d81eb4d2 (patch)
treec9eeb1a98892fa424c16e5b8ae930262228aa740 /src/defs.js
parent49d690ac913f025178606c8e2f64640060352ce6 (diff)
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Avoid String.fromCodePoint (IE compat)
Diffstat (limited to 'src/defs.js')
-rw-r--r--src/defs.js23
1 files changed, 17 insertions, 6 deletions
diff --git a/src/defs.js b/src/defs.js
index e5ffe35..b96dcf5 100644
--- a/src/defs.js
+++ b/src/defs.js
@@ -173,11 +173,10 @@ const to_jsstring = function(value, from, to) {
let str = "";
for (let i = (from!==void 0?from:0); i < to;) {
- let u;
let u0 = value[i++];
if (u0 < 0x80) {
/* single byte sequence */
- u = u0;
+ str += String.fromCharCode(u0);
} else if (u0 < 0xC2 || u0 > 0xF4) {
throw RangeError("cannot convert invalid utf8 to javascript string");
} else if (u0 <= 0xDF) {
@@ -185,7 +184,7 @@ const to_jsstring = function(value, from, to) {
if (i >= to) throw RangeError("cannot convert invalid utf8 to javascript string");
let u1 = value[i++];
if ((u1&0xC0) !== 0x80) throw RangeError("cannot convert invalid utf8 to javascript string");
- u = ((u0 & 0x1F) << 6) + (u1 & 0x3F);
+ str += String.fromCharCode(((u0 & 0x1F) << 6) + (u1 & 0x3F));
} else if (u0 <= 0xEF) {
/* three byte sequence */
if (i+1 >= to) throw RangeError("cannot convert invalid utf8 to javascript string");
@@ -193,7 +192,15 @@ const to_jsstring = function(value, from, to) {
if ((u1&0xC0) !== 0x80) throw RangeError("cannot convert invalid utf8 to javascript string");
let u2 = value[i++];
if ((u2&0xC0) !== 0x80) throw RangeError("cannot convert invalid utf8 to javascript string");
- u = ((u0 & 0x0F) << 12) + ((u1 & 0x3F) << 6) + (u2 & 0x3F);
+ let u = ((u0 & 0x0F) << 12) + ((u1 & 0x3F) << 6) + (u2 & 0x3F);
+ if (u <= 0xFFFF) { /* BMP codepoint */
+ str += String.fromCharCode(u);
+ } else { /* Astral codepoint */
+ u -= 0x10000;
+ let s1 = (u >> 10) + 0xD800;
+ let s2 = (u % 0x400) + 0xDC00;
+ str += String.fromCharCode(s1, s2);
+ }
} else {
/* four byte sequence */
if (i+2 >= to) throw RangeError("cannot convert invalid utf8 to javascript string");
@@ -203,9 +210,13 @@ const to_jsstring = function(value, from, to) {
if ((u2&0xC0) !== 0x80) throw RangeError("cannot convert invalid utf8 to javascript string");
let u3 = value[i++];
if ((u3&0xC0) !== 0x80) throw RangeError("cannot convert invalid utf8 to javascript string");
- u = ((u0 & 0x07) << 18) + ((u1 & 0x3F) << 12) + ((u2 & 0x3F) << 6) + (u3 & 0x3F);
+ /* Has to be astral codepoint */
+ let u = ((u0 & 0x07) << 18) + ((u1 & 0x3F) << 12) + ((u2 & 0x3F) << 6) + (u3 & 0x3F);
+ u -= 0x10000;
+ let s1 = (u >> 10) + 0xD800;
+ let s2 = (u % 0x400) + 0xDC00;
+ str += String.fromCharCode(s1, s2);
}
- str += String.fromCodePoint(u);
}
return str;
};