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91 lines
2.6 KiB
91 lines
2.6 KiB
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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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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} |