@wix/css-property-parser/dist/evaluators/writing-mode.js

A comprehensive TypeScript library for parsing and serializing CSS property values with full MDN specification compliance

import { isCssVariable, isGlobalKeyword, getValidKeyword } from '../utils/shared-utils.js';
import { parse as parseCSSVariable, toCSSValue as cssVariableToCSSValue } from './css-variable.js';
import { WRITING_MODE_KEYWORDS } from '../types.js';
/**
 * Parses CSS writing-mode property values
 *
 * Syntax: horizontal-tb | vertical-rl | vertical-lr | inherit | initial | unset | revert
 *
 * @param value - The CSS writing-mode value to parse
 * @returns Parsed WritingModeValue or null if invalid
 *
 * @example
 * ```typescript
 * parse('horizontal-tb') // { type: 'keyword', keyword: 'horizontal-tb' }
 * parse('vertical-rl') // { type: 'keyword', keyword: 'vertical-rl' }
 * parse('vertical-lr') // { type: 'keyword', keyword: 'vertical-lr' }
 * parse('inherit') // { type: 'keyword', keyword: 'inherit' }
 * parse('var(--writing-mode)') // { type: 'variable', variable: 'writing-mode' }
 * ```
 */
export function parse(value) {
    if (!value || typeof value !== 'string') {
        return null;
    }
    const trimmed = value.trim();
    if (trimmed === '') {
        return null;
    }
    // CSS variables - parse and return directly
    if (isCssVariable(trimmed)) {
        return parseCSSVariable(trimmed);
    }
    // Handle global keywords
    if (isGlobalKeyword(trimmed)) {
        return {
            type: 'keyword',
            keyword: trimmed.toLowerCase()
        };
    }
    // Handle writing-mode specific keywords
    const keywordResult = getValidKeyword(trimmed.toLowerCase(), WRITING_MODE_KEYWORDS);
    if (keywordResult) {
        return {
            type: 'keyword',
            keyword: keywordResult
        };
    }
    return null;
}
/**
 * Converts a parsed WritingModeValue back to its CSS string representation
 *
 * @param value - The parsed writing-mode value
 * @returns CSS string representation or null if invalid
 */
export function toCSSValue(value) {
    if (!value) {
        return null;
    }
    // Handle CSS variables
    if (value.type === 'variable') {
        return cssVariableToCSSValue(value);
    }
    // Handle keyword values (both writing-mode-specific and global)
    if (value.type === 'keyword') {
        return value.keyword;
    }
    return null;
}