feat(metadata): support advanced generics using recursion #763
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,170 @@ | ||
| /** | ||
| * Safely splits a string by a given set of separators at depth 0 (ignoring those inside < > or ( )). | ||
| * | ||
| * @param {string} str The string to split | ||
| * @param {string} separator The separator to split by (e.g., '|', '&', ',', '=>') | ||
| * @returns {string[]} The split pieces | ||
| */ | ||
| const splitByOuterSeparator = (str, separator) => { | ||
| const pieces = []; | ||
| let current = ''; | ||
| let depth = 0; | ||
|
|
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| for (let i = 0; i < str.length; i++) { | ||
| const char = str[i]; | ||
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| // Track depth using brackets and parentheses | ||
| if (char === '<' || char === '(') { | ||
| depth++; | ||
| } else if ((char === '>' && str[i - 1] !== '=') || char === ')') { | ||
| depth--; | ||
| } | ||
|
|
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| // Check for multi-character separators like '=>' | ||
| const isArrow = separator === '=>' && char === '=' && str[i + 1] === '>'; | ||
| // Check for single-character separators | ||
| const isCharSeparator = separator === char; | ||
|
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| if (depth === 0 && (isCharSeparator || isArrow)) { | ||
| pieces.push(current.trim()); | ||
| current = ''; | ||
| if (isArrow) { | ||
| i++; | ||
| } // skip the '>' part of '=>' | ||
| continue; | ||
| } | ||
|
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| current += char; | ||
| } | ||
|
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| pieces.push(current.trim()); | ||
| return pieces; | ||
| }; | ||
| /** | ||
| * Safely removes outer parentheses from a type string if they wrap the entire string. | ||
| * This prevents "depth blindness" in the parser by unwrapping types like `(string | number)` | ||
| * into `string | number`, while safely ignoring disconnected groups like `(A) | (B)`. | ||
| * | ||
| * @param {string} typeString The type string to evaluate and potentially unwrap. | ||
| * @returns {string} The unwrapped type string, or the original string if not fully wrapped. | ||
| */ | ||
| export const stripOuterParentheses = typeString => { | ||
| let trimmed = typeString.trim(); | ||
|
|
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| if (trimmed.startsWith('(') && trimmed.endsWith(')')) { | ||
| let depth = 0; | ||
| let isValidWrapper = true; | ||
|
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| // Iterate through the string, ignoring the last closing parenthesis | ||
| for (let i = 0; i < trimmed.length - 1; i++) { | ||
| if (trimmed[i] === '(') { | ||
| depth++; | ||
| } else if (trimmed[i] === ')') { | ||
| depth--; | ||
| } | ||
|
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| // If depth hits 0 before the end, it means the parentheses don't wrap the whole string | ||
| if (depth === 0) { | ||
| isValidWrapper = false; | ||
| break; | ||
| } | ||
| } | ||
|
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| if (isValidWrapper) { | ||
| return trimmed.slice(1, -1).trim(); | ||
| } | ||
| } | ||
|
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| return trimmed; | ||
| }; | ||
| /** | ||
| * Recursively parses advanced TypeScript types, including Unions, Intersections, Functions, and Nested Generics. | ||
| * * @param {string} typeString The plain type string to evaluate | ||
| * @param {Function} transformType The function used to resolve individual types into links | ||
| * @returns {string|null} The formatted Markdown link(s), or null if the base type doesn't map | ||
| */ | ||
| export const parseType = (typeString, transformType) => { | ||
| // Clean the string and strip unnecessary outer parentheses to prevent depth blindness (e.g., "(string | number)" -> "string | number") | ||
| const trimmed = stripOuterParentheses(typeString); | ||
| if (!trimmed) { | ||
| return null; | ||
| } | ||
|
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| // Handle Functions (=>) | ||
| if (trimmed.includes('=>')) { | ||
| const parts = splitByOuterSeparator(trimmed, '=>'); | ||
| if (parts.length > 1) { | ||
| const params = parts[0]; | ||
|
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| // Join the rest back together to handle higher-order functions | ||
| const returnType = parts.slice(1).join(' => '); | ||
|
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| // Preserve the function signature, just link the return type for now | ||
| // (Mapping param types inside the signature string is complex and often unnecessary for simple docs) | ||
| const parsedReturn = | ||
| parseType(returnType, transformType) || `\`<${returnType}>\``; | ||
| return `${params} => ${parsedReturn}`; | ||
| } | ||
| } | ||
|
There was a problem hiding this comment. Arrow function checked first causes wrong operator precedenceMedium Severity The Additional Locations (1)  Reviewed by Cursor Bugbot for commit bb43bc8. Configure here. |
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| // Handle Unions (|) | ||
| if (trimmed.includes('|')) { | ||
| const parts = splitByOuterSeparator(trimmed, '|'); | ||
| if (parts.length > 1) { | ||
| // Re-evaluate each part recursively and join with ' | ' | ||
| const resolvedParts = parts.map( | ||
| p => parseType(p, transformType) || `\`<${p}>\`` | ||
| ); | ||
| return resolvedParts.join(' | '); | ||
| } | ||
| } | ||
|
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| // Handle Intersections (&) | ||
| if (trimmed.includes('&')) { | ||
| const parts = splitByOuterSeparator(trimmed, '&'); | ||
| if (parts.length > 1) { | ||
| // Re-evaluate each part recursively and join with ' & ' | ||
| const resolvedParts = parts.map( | ||
| p => parseType(p, transformType) || `\`<${p}>\`` | ||
| ); | ||
| return resolvedParts.join(' & '); | ||
| } | ||
| } | ||
|
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| // Handle Generics (Base<Inner, Inner>) | ||
| // Check if it's a generic wrapped in an array (e.g., Promise<string>[]) | ||
| const isGenericArray = trimmed.endsWith('[]'); | ||
| const genericTarget = isGenericArray ? trimmed.slice(0, -2).trim() : trimmed; | ||
|
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| if (genericTarget.includes('<') && genericTarget.endsWith('>')) { | ||
| const firstBracketIndex = genericTarget.indexOf('<'); | ||
| const baseType = genericTarget.slice(0, firstBracketIndex).trim(); | ||
| const innerType = genericTarget.slice(firstBracketIndex + 1, -1).trim(); | ||
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| const cleanBaseType = baseType.replace(/\[\]$/, ''); // Just in case of Base[]<Inner> | ||
| const baseResult = transformType(cleanBaseType); | ||
|
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| const baseFormatted = baseResult | ||
| ? `[\`<${cleanBaseType}>\`](${baseResult})` | ||
| : `\`<${cleanBaseType}>\``; | ||
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| const innerArgs = splitByOuterSeparator(innerType, ','); | ||
| const innerFormatted = innerArgs | ||
| .map(arg => parseType(arg, transformType) || `\`<${arg}>\``) | ||
| .join(', '); | ||
|
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| return `${baseFormatted}<${innerFormatted}>${isGenericArray ? '[]' : ''}`; | ||
| } | ||
|
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| // Base Case: Plain Type (e.g., string, Buffer, Function) | ||
| // Preserve array notation for base types | ||
| const isArray = trimmed.endsWith('[]'); | ||
| const cleanType = trimmed.replace(/\[\]$/, ''); | ||
|
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| const result = transformType(cleanType); | ||
| if (cleanType.length && result) { | ||
| return `[\`<${cleanType}>\`](${result})${isArray ? '[]' : ''}`; | ||
| } | ||
|
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| return null; | ||
| }; | ||
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