Stable function and action surface for downstream plugins and themes that consume Data Machine Events. Consumers should target this contract — not internal classes — for forward-compatibility.

Stability promise

Everything in this document is part of the supported public API. Breaking changes are governed by semver and called out in docs/CHANGELOG.md.

Anything not in this document is internal. That includes (non-exhaustive):

• Every PHP class under DataMachineEvents… (e.g. BlocksCalendar…, Core…, Steps…, Abilities…).
• File paths under inc/ and inc/Blocks/Calendar/.
• Block-render template files under inc/Blocks/Calendar/templates/.

Internal classes may be renamed, moved across namespaces, or refactored at any time. Do not gate consumer code on class_exists() against an internal class name. That pattern has produced repeated silent breakage in downstream plugins (renames early-return guards without a fatal, so the integration just stops working without any visible signal).

How to consume the API

1. Gate on the loaded action, not on classes

// Bad — couples to an internal class name. Renames break this silently.
if ( class_exists( 'DataMachineEventsBlocksCalendarTaxonomyBadges' ) ) {
    add_filter( 'data_machine_events_badge_classes', 'my_callback', 10, 4 );
}

// Good — gates on the documented public action.
add_action( 'data_machine_events_loaded', function () {
    add_filter( 'data_machine_events_badge_classes', 'my_callback', 10, 4 );
} );

// Also good — for code that runs after init priority 30 you can use:
if ( data_machine_events_is_loaded() ) {
    echo data_machine_events_render_taxonomy_badges( $post_id );
}

2. Call public functions, not internal classes

// Bad — couples to an internal class.
$data = DataMachineEventsBlocksCalendarDataEventHydrator::parse_event_data( $post );

// Good — uses the public function.
$data = data_machine_events_parse_event_data( $post );

Public actions

data_machine_events_loaded

Fired once at init priority 30, after post types (0), blocks (15), taxonomies (20), and Data Machine integration (25) have registered. Consumers should hook here to register filters or perform any setup that depends on events infrastructure being available.

add_action( 'data_machine_events_loaded', function () {
    add_filter( 'data_machine_events_badge_classes', 'my_callback', 10, 4 );
    add_filter( 'data_machine_events_excluded_taxonomies', 'my_exclude', 10, 2 );
} );

did_action( 'data_machine_events_loaded' ) returns truthy from any code running after init priority 30.

Public filters

These filters are part of the supported API surface. Their names and signatures are stable.

Calendar block filters

Event Details block filters

Events Map block filters

Event Details / button-row actions

Public functions

All functions are global (no namespace) and idempotently declared with function_exists() guards.

data_machine_events_is_loaded(): bool

Returns true once the data_machine_events_loaded action has fired. Convenience wrapper around did_action().

data_machine_events_parse_event_data( WP_Post $post ): ?array

Parse and hydrate event data for a given event post. Returns the event’s block-attribute payload (start/end dates and times, venue, promoter, performer, ticket URL, price, etc.) hydrated from the authoritative storage layer. Returns null if the post has no parseable Event Details block.

$data = data_machine_events_parse_event_data( $post );
if ( $data ) {
    echo esc_html( $data['startDate'] );
    echo esc_html( $data['venue'] ?? '' );
}

data_machine_events_render_taxonomy_badges( int $post_id ): string

Render the calendar block’s taxonomy badge markup for an event post. Returns HTML; empty string when no taxonomies apply. Honors all badge filters above.

data_machine_events_group_by_date( array $paged_events, bool $show_past = false, string $date_start = '', string $date_end = '' ): array

Group a list of events by date. Wraps the calendar block’s date grouper so callers can produce calendar-shaped output without importing the internal class.

data_machine_events_query_events( array $params ): array

Convenience wrapper around EventDateQueryAbilities::executeQueryEvents() for callers that need a list of event posts filtered by scope, taxonomy filters, and date range.

Pass-through parameters mirror the underlying ability:

Returns [ 'posts' => WP_Post[], 'total' => int, … ].

data_machine_events_get_venue_data( int $term_id ): ?array

Return the structured venue data array stored against a venue term — address fields, lat/lng, website, etc. Returns null when the term does not exist or has no venue data. Use this instead of calling Venue_Taxonomy::get_venue_data() directly.

data_machine_events_get_venue_address( int $term_id, ?array $venue_data = null ): string

Return the formatted single-line address for a venue term. Pass $venue_data if you already have it to avoid an extra meta read. Use this instead of Venue_Taxonomy::get_formatted_address().

data_machine_events_get_promoter_data( int $term_id ): ?array

Return the structured promoter data array stored against a promoter term. Use this instead of Promoter_Taxonomy::get_promoter_data().

data_machine_events_get_event_datetime( int $post_id ): string

Return the start datetime string for an event, or empty string when no row exists for the post in the datamachine_event_dates table. Equivalent to calling the existing datamachine_get_event_dates() and reading start_datetime.

Pre-existing helpers (kept stable)

These functions predate this document and remain part of the public API:

• datamachine_get_event_dates( int $post_id ): ?object — full event-dates row from the datamachine_event_dates table.
• datamachine_get_event_timing( int $post_id ): string — 'upcoming' | 'ongoing' | 'past'.

Public constants

Migration guide

Replacing legacy class_exists() guards in a downstream consumer:

// Before — couples to an internal class.
function my_plugin_init_calendar_integration() {
    if ( ! class_exists( 'DataMachineEventsBlocksCalendarTaxonomyBadges' ) ) {
        return;
    }

    add_filter( 'data_machine_events_badge_classes', 'my_callback', 10, 4 );
}
add_action( 'init', 'my_plugin_init_calendar_integration' );

// After — gates on the public action.
add_action( 'data_machine_events_loaded', function () {
    add_filter( 'data_machine_events_badge_classes', 'my_callback', 10, 4 );
} );

// Before — direct internal-class call.
if ( class_exists( 'DataMachineEventsBlocksCalendarDataEventHydrator' ) ) {
    $event_data = DataMachineEventsBlocksCalendarDataEventHydrator::parse_event_data( $post );
}

// After — public function.
$event_data = data_machine_events_parse_event_data( $post );