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* Conditional Builder
*
* Generates conditional rendering logic for UIF variants that alter structure.
*/
import type { ComponentMetadata, PropMetadata, StructureMetadata } from '@fds-uif/generator-base/browser';
import type { GenerationContext } from './types.js';
/**
* Analyze variants that affect rendering
*/
export interface VariantRenderInfo {
/** Variant prop name */
name: string;
/** Whether variant changes element type */
changesElement: boolean;
/** Whether variant adds/removes children */
changesChildren: boolean;
/** Whether variant changes slots */
changesSlots: boolean;
/** Possible values */
options: string[];
}
/**
* Analyze which variants affect rendering
*/
export function analyzeRenderingVariants(metadata: ComponentMetadata): VariantRenderInfo[] {
const renderingVariants: VariantRenderInfo[] = [];
for (const prop of metadata.props) {
if (prop.source !== 'variant') continue;
// Check if this variant has structural implications
// For now, we detect variants that might change element types
const isRenderingVariant = prop.name === 'element' || prop.name === 'as' || prop.name.includes('type');
if (isRenderingVariant) {
renderingVariants.push({
name: prop.name,
changesElement: prop.name === 'element' || prop.name === 'as',
changesChildren: false,
changesSlots: false,
options: extractOptions(prop),
});
}
}
return renderingVariants;
}
/**
* Extract variant options from prop type
*/
function extractOptions(prop: PropMetadata): string[] {
Iif (!prop.type) return [];
// Parse union type: 'button' | 'link' | 'reset'
return prop.type
.split('|')
.map((s) => s.trim().replace(/^'/, '').replace(/'$/, ''))
.filter((s) => s && !s.includes(' '));
}
/**
* Build conditional rendering for element variants
*/
export function buildElementConditional(
variantName: string,
options: string[],
structure: StructureMetadata,
context: GenerationContext,
): string {
if (options.length === 0) {
return '';
}
// Generate a switch-based element selection
const cases: string[] = [];
for (const option of options) {
const element = mapOptionToElement(option);
cases.push(` case '${option}':`);
cases.push(` Element = '${element}';`);
cases.push(' break;');
}
return ` // Determine element type based on ${variantName}
let Element: keyof JSX.IntrinsicElements = '${structure.element || 'div'}';
switch (${variantName}) {
${cases.join('\n')}
}`;
}
/**
* Map variant option to HTML element
*/
function mapOptionToElement(option: string): string {
const elementMap: Record<string, string> = {
button: 'button',
link: 'a',
submit: 'button',
reset: 'button',
anchor: 'a',
span: 'span',
div: 'div',
section: 'section',
article: 'article',
nav: 'nav',
header: 'header',
footer: 'footer',
main: 'main',
aside: 'aside',
};
return elementMap[option.toLowerCase()] || option;
}
/**
* Build conditional children rendering
*/
export function buildChildrenConditional(
condition: string,
trueContent: string,
falseContent?: string,
context?: GenerationContext,
): string {
if (falseContent) {
return `{${condition} ? (
${indent(trueContent, 3)}
) : (
${indent(falseContent, 3)}
)}`;
}
return `{${condition} && (
${indent(trueContent, 3)}
)}`;
}
/**
* Build conditional wrapper for variant-based structure changes
*/
export function buildVariantWrapper(
variants: VariantRenderInfo[],
structure: StructureMetadata,
context: GenerationContext,
): string {
// If no variants affect rendering, return empty
if (variants.length === 0) {
return '';
}
const parts: string[] = [];
for (const variant of variants) {
Eif (variant.changesElement) {
parts.push(buildElementConditional(variant.name, variant.options, structure, context));
}
}
return parts.join('\n\n');
}
/**
* Utility: indent multiline string
*/
function indent(str: string, levels: number): string {
const spaces = ' '.repeat(levels);
return str
.split('\n')
.map((line) => spaces + line)
.join('\n');
}
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