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Refactor number and string utils out of builtins, fixes #608

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dcode
2019-06-06 16:19:10 +02:00
parent 0484a6b740
commit 4680b530fb
23 changed files with 988 additions and 979 deletions
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57
std/assembly/util/string.ts
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@ -57,7 +57,7 @@ export function isWhiteSpaceOrLineTerminator(c: i32): bool {
}
/** Parses a string to an integer (usually), using the specified radix. */
export function parse<T>(str: string, radix: i32 = 0): T {
export function strtol<T>(str: string, radix: i32 = 0): T {
var len: i32 = str.length;
// @ts-ignore: cast
if (!len) return <T>NaN;
@ -139,3 +139,58 @@ export function parse<T>(str: string, radix: i32 = 0): T {
// @ts-ignore: type
return sign * num;
}
// FIXME: naive implementation
export function strtod(str: string): f64 {
var len: i32 = str.length;
if (!len) return NaN;
var ptr = changetype<usize>(str);
var code = <i32>load<u16>(ptr);
// determine sign
var sign: f64;
// trim white spaces
while (isWhiteSpaceOrLineTerminator(code)) {
code = <i32>load<u16>(ptr += 2);
--len;
}
if (code == CharCode.MINUS) {
if (!--len) return NaN;
code = <i32>load<u16>(ptr += 2);
sign = -1;
} else if (code == CharCode.PLUS) {
if (!--len) return NaN;
code = <i32>load<u16>(ptr += 2);
sign = 1;
} else {
sign = 1;
}
// calculate value
var num: f64 = 0;
while (len--) {
code = <i32>load<u16>(ptr);
if (code == CharCode.DOT) {
ptr += 2;
let fac: f64 = 0.1; // precision :(
while (len--) {
code = <i32>load<u16>(ptr);
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;
}