diff options
Diffstat (limited to 'node_modules/@webassemblyjs/floating-point-hex-parser/lib')
-rw-r--r-- | node_modules/@webassemblyjs/floating-point-hex-parser/lib/index.js | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/node_modules/@webassemblyjs/floating-point-hex-parser/lib/index.js b/node_modules/@webassemblyjs/floating-point-hex-parser/lib/index.js new file mode 100644 index 0000000..a867699 --- /dev/null +++ b/node_modules/@webassemblyjs/floating-point-hex-parser/lib/index.js @@ -0,0 +1,49 @@ +"use strict"; + +Object.defineProperty(exports, "__esModule", { + value: true +}); +exports.default = parse; + +function parse(input) { + input = input.toUpperCase(); + var splitIndex = input.indexOf("P"); + var mantissa, exponent; + + if (splitIndex !== -1) { + mantissa = input.substring(0, splitIndex); + exponent = parseInt(input.substring(splitIndex + 1)); + } else { + mantissa = input; + exponent = 0; + } + + var dotIndex = mantissa.indexOf("."); + + if (dotIndex !== -1) { + var integerPart = parseInt(mantissa.substring(0, dotIndex), 16); + var sign = Math.sign(integerPart); + integerPart = sign * integerPart; + var fractionLength = mantissa.length - dotIndex - 1; + var fractionalPart = parseInt(mantissa.substring(dotIndex + 1), 16); + var fraction = fractionLength > 0 ? fractionalPart / Math.pow(16, fractionLength) : 0; + + if (sign === 0) { + if (fraction === 0) { + mantissa = sign; + } else { + if (Object.is(sign, -0)) { + mantissa = -fraction; + } else { + mantissa = fraction; + } + } + } else { + mantissa = sign * (integerPart + fraction); + } + } else { + mantissa = parseInt(mantissa, 16); + } + + return mantissa * (splitIndex !== -1 ? Math.pow(2, exponent) : 1); +}
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