Module request 

Shared preview request resolution for water preview and the MCP preview tool.

Both entry points accept the same arguments — a #[preview] function path or expression target, a frame size, and optional platform/backend/theme overrides — and resolve them through the functions here, so the two can never drift apart.

Structs

PreviewRequest

A fully resolved preview render, ready to hand to the Hydrolysis or support-app execution path.

Enums

CliHydrolysisPreviewTheme

Theme package for Hydrolysis preview.

CliPreviewBackend

Rendering backend for preview.

CliPreviewPlatform

Target platform for preview.

PreviewTarget

What a preview render draws: a #[preview] function exported from the project crate, or an inline WaterUI expression.

Constants

DEFAULT_FRAME

Default frame size shared by water preview --frame and the MCP preview tool’s frame argument.

Functions

check_toolchain_for_backend

Check the host toolchain required by the resolved backend.

ensure_hydrolysis_preview_platform

water preview test supports Hydrolysis on macOS only.

parse_frame

Parse frame size from a WIDTHxHEIGHT string.

render_with_symbol

Render symbol through the support-app session, translating a missing export into an actionable #[preview] hint.

resolve_hydrolysis_preview_theme

Resolve the Hydrolysis theme: required for the Hydrolysis backend, rejected for the others.

resolve_preview_backend

Resolve the rendering backend for a platform, applying the override when given.

resolve_preview_platform

Resolve the preview platform, defaulting to this host’s native preview platform.

resolve_preview_target

Resolve the preview target: expr forces expression mode, and a target that is not a Rust path is treated as an expression either way.