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author | 2020-11-16 00:10:28 +0100 | |
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committer | 2020-11-16 00:10:28 +0100 | |
commit | e06ec920f7a5d784e674c4c4b4e6d1da3dc7391d (patch) | |
tree | 55713f725f77b44ebfec86e4eec3ce33e71458ca /node_modules/@webassemblyjs/wast-parser/esm/number-literals.js | |
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api, login, auth
Diffstat (limited to 'node_modules/@webassemblyjs/wast-parser/esm/number-literals.js')
-rw-r--r-- | node_modules/@webassemblyjs/wast-parser/esm/number-literals.js | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/node_modules/@webassemblyjs/wast-parser/esm/number-literals.js b/node_modules/@webassemblyjs/wast-parser/esm/number-literals.js new file mode 100644 index 0000000..98b8996 --- /dev/null +++ b/node_modules/@webassemblyjs/wast-parser/esm/number-literals.js @@ -0,0 +1,91 @@ +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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