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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" | |
| ); | |
| } | |