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ES6 Unicode Code Point Escape Sequence support.

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Ingvar Stepanyan 2014-07-23 19:47:13 +03:00 committed by Marijn Haverbeke
parent 47587e6e9b
commit a31bad6773
1 changed files with 22 additions and 1 deletions
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23
acorn.js
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@ -858,6 +858,27 @@
// Read a string value, interpreting backslash-escapes.
function readCodePoint() {
var ch = input.charCodeAt(tokPos), code;
if (ch === 123) {
++tokPos;
code = readHexChar();
ch = input.charCodeAt(tokPos++);
if (code > 0x10FFFF || ch !== 125 /* '}' */) unexpected();
} else {
code = readHexChar(4);
}
// UTF-16 Encoding
if (code <= 0xFFFF) {
return String.fromCharCode(code);
}
var cu1 = ((code - 0x10000) >> 10) + 0xD800;
var cu2 = ((code - 0x10000) & 1023) + 0xDC00;
return String.fromCharCode(cu1, cu2);
}
function readString(quote) {
tokPos++;
var out = "";
@ -884,7 +905,7 @@
case 110: out += "\n"; break; // 'n' -> '\n'
case 114: out += "\r"; break; // 'r' -> '\r'
case 120: out += String.fromCharCode(readHexChar(2)); break; // 'x'
case 117: out += String.fromCharCode(readHexChar(4)); break; // 'u'
case 117: out += readCodePoint(); break; // 'u'
case 85: out += String.fromCharCode(readHexChar(8)); break; // 'U'
case 116: out += "\t"; break; // 't' -> '\t'
case 98: out += "\b"; break; // 'b' -> '\b'