<?php
function wp_register_typography_support($block_type)
{
$has_font_size_support = false;
if (property_exists($block_type, 'supports')) {
$has_font_size_support = _wp_array_get($block_type->supports, array('__experimentalFontSize'), false);
}
$has_line_height_support = false;
if (property_exists($block_type, 'supports')) {
$has_line_height_support = _wp_array_get($block_type->supports, array('__experimentalLineHeight'), false);
}
if (!$block_type->attributes) {
$block_type->attributes = array();
}
if (($has_font_size_support || $has_line_height_support) && !array_key_exists('style', $block_type->attributes)) {
$block_type->attributes['style'] = array('type' => 'object');
}
if ($has_font_size_support && !array_key_exists('fontSize', $block_type->attributes)) {
$block_type->attributes['fontSize'] = array('type' => 'string');
}
}
function wp_apply_typography_support($block_type, $block_attributes)
{
$has_font_size_support = false;
$classes = array();
$styles = array();
if (property_exists($block_type, 'supports')) {
$has_font_size_support = _wp_array_get($block_type->supports, array('fontSize'), false);
}
$has_line_height_support = false;
if (property_exists($block_type, 'supports')) {
$has_line_height_support = _wp_array_get($block_type->supports, array('lineHeight'), false);
}
if ($has_font_size_support) {
$has_named_font_size = array_key_exists('fontSize', $block_attributes);
$has_custom_font_size = isset($block_attributes['style']['typography']['fontSize']);
if ($has_named_font_size) {
$classes[] = sprintf('has-%s-font-size', $block_attributes['fontSize']);
} elseif ($has_custom_font_size) {
$styles[] = sprintf('font-size: %spx;', $block_attributes['style']['typography']['fontSize']);
}
}
if ($has_line_height_support) {
$has_line_height = isset($block_attributes['style']['typography']['lineHeight']);
if ($has_line_height) {
$styles[] = sprintf('line-height: %s;', $block_attributes['style']['typography']['lineHeight']);
}
}
$attributes = array();
if (!empty($classes)) {
$attributes['class'] = implode(' ', $classes);
}
if (!empty($styles)) {
$attributes['style'] = implode(' ', $styles);
}
return $attributes;
}
WP_Block_Supports::get_instance()->register('typography', array('register_attribute' => 'wp_register_typography_support', 'apply' => 'wp_apply_typography_support'));