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Initial parseInt using loads, see #8

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dcodeIO
2018-01-28 23:42:55 +01:00
parent 896810859e
commit 002fba3067
10 changed files with 1108 additions and 6 deletions
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97
std/assembly/string.ts
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@ -322,9 +322,100 @@ function isWhiteSpaceOrLineTerminator(c: u16): bool {
}
}
// @binding(CALL, [ STRING, PASS_THRU ], PASS_THRU)
export function parseInt(str: string, radix: i32 = 10): f64 {
throw new Error("not implemented");
const enum CharCode {
PLUS = 0x2B,
MINUS = 0x2D,
_0 = 0x30,
_1 = 0x31,
_2 = 0x32,
_3 = 0x33,
_4 = 0x34,
_5 = 0x35,
_6 = 0x36,
_7 = 0x37,
_8 = 0x38,
_9 = 0x39,
A = 0x41,
B = 0x42,
O = 0x4F,
X = 0x58,
Z = 0x5a,
a = 0x61,
b = 0x62,
o = 0x6F,
x = 0x78,
z = 0x7A
}
export function parseInt(str: String, radix: i32 = 0): i64 {
var len = str.length;
var ptr = changetype<usize>(str) + HEAD;
if (!len)
return 0; // (NaN)
var code = <i32>load<u16>(ptr);
// determine sign
var sign: i64;
if (code == CharCode.MINUS) {
if (!--len)
return 0; // (NaN)
code = <i32>load<u16>(ptr += 2);
sign = -1;
} else if (code == CharCode.PLUS) {
if (!--len)
return 0; // (NaN)
code = <i32>load<u16>(ptr += 2);
sign = 1;
} else
sign = 1;
// determine radix
if (!radix) {
if (code == CharCode._0 && len > 2) {
switch (<i32>load<u16>(ptr + 2)) {
case CharCode.B:
case CharCode.b:
ptr += 4; len -= 2;
radix = 2;
break;
case CharCode.O:
case CharCode.o:
ptr += 4; len -= 2;
radix = 8;
break;
case CharCode.X:
case CharCode.x:
ptr += 4; len -= 2;
radix = 16;
break;
default:
radix = 10;
}
} else radix = 10;
}
// calculate value
var num: i64 = 0;
while (len--) {
code = <i32>load<u16>(ptr);
if (code >= CharCode._0 && code <= CharCode._9)
code -= CharCode._0;
else if (code >= CharCode.A && code <= CharCode.Z)
code -= CharCode.A - 10;
else if (code >= CharCode.a && code <= CharCode.z)
code -= CharCode.a - 10;
else
return sign * num;
if (code >= radix)
return sign * num;
num = (num * radix) + code;
ptr += 2;
}
return sign * num;
}
// @binding(CALL, [ STRING ], PASS_THRU)