@wix/css-property-parser/dist/evaluators/font-size.js

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

// Font Size property parser
// Handles parsing of CSS font-size property values
// https://developer.mozilla.org/en-US/docs/Web/CSS/font-size
import { isCssVariable, isGlobalKeyword, getValidKeyword } from '../utils/shared-utils.js';
import { parse as parseCSSVariable, toCSSValue as cssVariableToCSSValue } from './css-variable.js';
import { parse as parseLength, toCSSValue as lengthToCSSValue } from './length.js';
import { parse as parsePercentage, toCSSValue as percentageToCSSValue } from './percentage.js';
// Import centralized types
import { FONT_SIZE_KEYWORDS } from '../types.js';
/**
 * Parse a CSS font-size property string
 */
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 font-size keywords
    const fontSizeKeyword = getValidKeyword(trimmed, FONT_SIZE_KEYWORDS);
    if (fontSizeKeyword) {
        return { type: 'keyword', keyword: fontSizeKeyword };
    }
    // Percentage values
    const percentageResult = parsePercentage(trimmed);
    if (percentageResult) {
        return percentageResult;
    }
    // Length values
    const lengthResult = parseLength(trimmed);
    if (lengthResult) {
        return lengthResult;
    }
    return null;
}
/**
 * Convert FontSizeValue back to CSS string
 */
export function toCSSValue(parsed) {
    if (!parsed) {
        return null;
    }
    // Handle CSS variables
    if ('CSSvariable' in parsed) {
        return cssVariableToCSSValue(parsed);
    }
    if ('keyword' in parsed) {
        return parsed.keyword;
    }
    // Handle length values
    if ('unit' in parsed && parsed.unit !== '%' && parsed.type === 'length') {
        return lengthToCSSValue(parsed);
    }
    // Handle percentage values
    if ('unit' in parsed && parsed.unit === '%' && parsed.type === 'percentage') {
        return percentageToCSSValue(parsed);
    }
    return null;
}