8 lines
3.9 KiB
Plaintext
8 lines
3.9 KiB
Plaintext
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{
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"version": 3,
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"sources": ["../../../lib/utils/join-sql-fragments.ts"],
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"sourcesContent": ["import { SQLFragment, TruthySQLFragment } from '../generic/sql-fragment';\n\nfunction doesNotWantLeadingSpace(str: string): boolean {\n return /^[;,)]/.test(str);\n}\nfunction doesNotWantTrailingSpace(str: string): boolean {\n return /\\($/.test(str);\n}\n\n/**\n * Joins an array of strings with a single space between them,\n * except for:\n *\n * - Strings starting with ';', ',' and ')', which do not get a leading space.\n * - Strings ending with '(', which do not get a trailing space.\n *\n * @param {string[]} parts\n * @returns {string}\n * @private\n */\nfunction singleSpaceJoinHelper(parts: string[]): string {\n return parts.reduce(\n ({ skipNextLeadingSpace, result }, part) => {\n if (skipNextLeadingSpace || doesNotWantLeadingSpace(part)) {\n result += part.trim();\n } else {\n result += ` ${part.trim()}`;\n }\n return {\n skipNextLeadingSpace: doesNotWantTrailingSpace(part),\n result\n };\n },\n {\n skipNextLeadingSpace: true,\n result: ''\n }\n ).result;\n}\n\n/**\n * Joins an array with a single space, auto trimming when needed.\n *\n * Certain elements do not get leading/trailing spaces.\n *\n * @param {SQLFragment[]} array The array to be joined. Falsy values are skipped. If an\n * element is another array, this function will be called recursively on that array.\n * Otherwise, if a non-string, non-falsy value is present, a TypeError will be thrown.\n *\n * @returns {string} The joined string.\n *\n * @private\n */\nexport function joinSQLFragments(array: SQLFragment[]): string {\n if (array.length === 0) return '';\n\n const truthyArray: TruthySQLFragment[] = array.filter(\n (x): x is string | SQLFragment[] => !!x\n );\n const flattenedArray: string[] = truthyArray.map(\n (fragment: TruthySQLFragment) => {\n if (Array.isArray(fragment)) {\n return joinSQLFragments(fragment);\n }\n\n return fragment;\n }\n );\n\n // Ensure strings\n for (const fragment of flattenedArray) {\n if (fragment && typeof fragment !== 'string') {\n throw new JoinSQLFragmentsError(\n flattenedArray,\n fragment,\n `Tried to construct a SQL string with a non-string, non-falsy fragment (${fragment}).`\n );\n }\n }\n\n // Trim fragments\n const trimmedArray = flattenedArray.map(x => x.trim());\n\n // Skip full-whitespace fragments (empty after the above trim)\n const nonEmptyStringArray = trimmedArray.filter(x => x !== '');\n\n return singleSpaceJoinHelper(nonEmptyStringArray);\n}\n\nexport class JoinSQLFragmentsError extends TypeError {\n args: SQLFragment[];\n fragment: any; // iirc this error is only used when we get an invalid fragment.\n\n constructor(args: SQLFragment[], fragment: any, message: string) {\n super(message);\n \n this.args = args;\n this.fragment = fragment;\n this.name = 'JoinSQLFragmentsError';\n }\n}\n"],
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"names": []
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}
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