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