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number-literals.js
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Mon, Nov 18, 14:36

number-literals.js
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import Long from "@xtuc/long";
import parseHexFloat from "@webassemblyjs/floating-point-hex-parser";
import { CompileError } from "@webassemblyjs/helper-api-error";
export function parse32F(sourceString) {
if (isHexLiteral(sourceString)) {
return parseHexFloat(sourceString);
}
if (isInfLiteral(sourceString)) {
return sourceString[0] === "-" ? -1 : 1;
}
if (isNanLiteral(sourceString)) {
return (sourceString[0] === "-" ? -1 : 1) * (sourceString.includes(":") ? parseInt(sourceString.substring(sourceString.indexOf(":") + 1), 16) : 0x400000);
}
return parseFloat(sourceString);
}
export function parse64F(sourceString) {
if (isHexLiteral(sourceString)) {
return parseHexFloat(sourceString);
}
if (isInfLiteral(sourceString)) {
return sourceString[0] === "-" ? -1 : 1;
}
if (isNanLiteral(sourceString)) {
return (sourceString[0] === "-" ? -1 : 1) * (sourceString.includes(":") ? parseInt(sourceString.substring(sourceString.indexOf(":") + 1), 16) : 0x8000000000000);
}
if (isHexLiteral(sourceString)) {
return parseHexFloat(sourceString);
}
return parseFloat(sourceString);
}
export function parse32I(sourceString) {
var value = 0;
if (isHexLiteral(sourceString)) {
value = ~~parseInt(sourceString, 16);
} else if (isDecimalExponentLiteral(sourceString)) {
throw new Error("This number literal format is yet to be implemented.");
} else {
value = parseInt(sourceString, 10);
}
return value;
}
export function parseU32(sourceString) {
var value = parse32I(sourceString);
if (value < 0) {
throw new CompileError("Illegal value for u32: " + sourceString);
}
return value;
}
export function parse64I(sourceString) {
var long;
if (isHexLiteral(sourceString)) {
long = Long.fromString(sourceString, false, 16);
} else if (isDecimalExponentLiteral(sourceString)) {
throw new Error("This number literal format is yet to be implemented.");
} else {
long = Long.fromString(sourceString);
}
return {
high: long.high,
low: long.low
};
}
var NAN_WORD = /^\+?-?nan/;
var INF_WORD = /^\+?-?inf/;
export function isInfLiteral(sourceString) {
return INF_WORD.test(sourceString.toLowerCase());
}
export function isNanLiteral(sourceString) {
return NAN_WORD.test(sourceString.toLowerCase());
}
function isDecimalExponentLiteral(sourceString) {
return !isHexLiteral(sourceString) && sourceString.toUpperCase().includes("E");
}
function isHexLiteral(sourceString) {
return sourceString.substring(0, 2).toUpperCase() === "0X" || sourceString.substring(0, 3).toUpperCase() === "-0X";
}

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