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Naive parseFloat

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This commit is contained in:
dcodeIO
2018-01-29 07:42:40 +01:00
parent d3f22637ed
commit 9e3b6f202d
7 changed files with 799 additions and 106 deletions
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57
std/assembly/string.ts
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@ -325,6 +325,7 @@ function isWhiteSpaceOrLineTerminator(c: u16): bool {
const enum CharCode {
PLUS = 0x2B,
MINUS = 0x2D,
DOT = 0x2E,
_0 = 0x30,
_1 = 0x31,
_2 = 0x32,
@ -337,11 +338,13 @@ const enum CharCode {
_9 = 0x39,
A = 0x41,
B = 0x42,
E = 0x45,
O = 0x4F,
X = 0x58,
Z = 0x5a,
a = 0x61,
b = 0x62,
e = 0x65,
o = 0x6F,
x = 0x78,
z = 0x7A
@ -410,16 +413,62 @@ export function parseInt(str: String, radix: i32 = 0): i64 {
else if (code >= CharCode.a && code <= CharCode.z)
code -= CharCode.a - 10;
else
return sign * num;
break;
if (code >= radix)
return sign * num;
break;
num = (num * radix) + code;
ptr += 2;
}
return sign * num;
}
// @binding(CALL, [ STRING ], PASS_THRU)
export function parseFloat(str: string): f64 {
throw new Error("not implemented");
var len: i32 = str.length;
if (!len)
return NaN;
var ptr = changetype<usize>(str) /* + HEAD -> offset */;
var code = <i32>load<u16>(ptr, HEAD);
// determine sign
var sign: f64;
if (code == CharCode.MINUS) {
if (!--len)
return NaN;
code = <i32>load<u16>(ptr += 2, HEAD);
sign = -1;
} else if (code == CharCode.PLUS) {
if (!--len)
return NaN;
code = <i32>load<u16>(ptr += 2, HEAD);
sign = 1;
} else
sign = 1;
// calculate value
var num: f64 = 0;
while (len--) {
code = <i32>load<u16>(ptr, HEAD);
if (code == CharCode.DOT) {
ptr += 2;
var fac: f64 = 0.1; // precision :(
while (len--) {
code = <i32>load<u16>(ptr, HEAD);
if (code == CharCode.E || code == CharCode.e)
assert(false); // TODO
code -= CharCode._0;
if (<u32>code > 9)
break;
num += <f64>code * fac;
fac *= 0.1;
ptr += 2;
}
break;
}
code -= CharCode._0;
if (<u32>code >= 10)
break;
num = (num * 10) + code;
ptr += 2;
}
return sign * num;
}