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31
cool-dawn-3d3b/node_modules/better-sqlite3/lib/methods/function.js
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cool-dawn-3d3b/node_modules/better-sqlite3/lib/methods/function.js
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'use strict';
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const { getBooleanOption, cppdb } = require('../util');
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module.exports = function defineFunction(name, options, fn) {
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// Apply defaults
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if (options == null) options = {};
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if (typeof options === 'function') { fn = options; options = {}; }
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// Validate arguments
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if (typeof name !== 'string') throw new TypeError('Expected first argument to be a string');
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if (typeof fn !== 'function') throw new TypeError('Expected last argument to be a function');
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if (typeof options !== 'object') throw new TypeError('Expected second argument to be an options object');
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if (!name) throw new TypeError('User-defined function name cannot be an empty string');
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// Interpret options
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const safeIntegers = 'safeIntegers' in options ? +getBooleanOption(options, 'safeIntegers') : 2;
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const deterministic = getBooleanOption(options, 'deterministic');
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const directOnly = getBooleanOption(options, 'directOnly');
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const varargs = getBooleanOption(options, 'varargs');
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let argCount = -1;
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// Determine argument count
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if (!varargs) {
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argCount = fn.length;
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if (!Number.isInteger(argCount) || argCount < 0) throw new TypeError('Expected function.length to be a positive integer');
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if (argCount > 100) throw new RangeError('User-defined functions cannot have more than 100 arguments');
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}
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this[cppdb].function(fn, name, argCount, safeIntegers, deterministic, directOnly);
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return this;
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};
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