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// @flow
import Long from "@xtuc/long";
import parseHexFloat from "@webassemblyjs/floating-point-hex-parser";
import { CompileError } from "@webassemblyjs/helper-api-error";
export function parse32F(sourceString: string): number {
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: string): number {
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: string): number {
let 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: string): number {
const value = parse32I(sourceString);
if (value < 0) {
throw new CompileError("Illegal value for u32: " + sourceString);
}
return value;
}
export function parse64I(sourceString: string): LongNumber {
// $FlowIgnore
let long: 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,
};
}
const NAN_WORD = /^\+?-?nan/;
const INF_WORD = /^\+?-?inf/;
export function isInfLiteral(sourceString: string): boolean {
return INF_WORD.test(sourceString.toLowerCase());
}
export function isNanLiteral(sourceString: string): boolean {
return NAN_WORD.test(sourceString.toLowerCase());
}
function isDecimalExponentLiteral(sourceString: string): boolean {
return (
!isHexLiteral(sourceString) && sourceString.toUpperCase().includes("E")
);
}
function isHexLiteral(sourceString: string): boolean {
return (
sourceString.substring(0, 2).toUpperCase() === "0X" ||
sourceString.substring(0, 3).toUpperCase() === "-0X"
);
}
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