ldtk.odin

package ldtk

import "core:encoding/json"
import "core:os"

load_from_file :: proc(filename: string, allocator := context.allocator) -> Maybe(Project) {
    data, ok := os.read_entire_file(filename, allocator)
    if !ok {
        return nil
    }
    return load_from_memory(data, allocator)
}

load_from_memory :: proc(data: []byte, allocator := context.allocator) -> Maybe(Project) {
    result: Project
    err := json.unmarshal(data, &result, json.DEFAULT_SPECIFICATION, allocator)
    if err == nil {
        return result
    }
    return nil
}

Project :: struct {
    // LDtk application build identifier.  This is only used to identify the LDtk version
    // that generated this particular project file, which can be useful for specific bug fixing.
    // Note that the build identifier is just the date of the release, so it's not unique to
    // each user (one single global ID per LDtk public release), and as a result, completely
    // anonymous.
    app_build_id:           f32 `json:"appBuildId"`,
    // Number of backup files to keep, if the `backupOnSave` is TRUE
    backup_limit:           int `json:"backupLimit"`,
    // If TRUE, an extra copy of the project will be created in a sub folder, when saving.
    backup_on_save:         bool `json:"backupOnSave"`,
    // Target relative path to store backup files
    backup_rel_path:        string `json:"backupRelPath"`,
    // Project background color
    bg_color:               string `json:"bgColor"`,
    // An array of command lines that can be ran manually by the user
    custom_commands:        []Custom_Command `json:"customCommands"`,
    // Default height for new entities
    default_entity_height:  int `json:"defaultEntityHeight"`,
    // Default width for new entities
    default_entity_width:   int `json:"defaultEntityWidth"`,
    // Default grid size for new layers
    default_grid_size:      int `json:"defaultGridSize"`,
    // Default background color of levels
    default_level_bg_color: string `json:"defaultLevelBgColor"`,
    // **WARNING**: this field will move to the `worlds` array after the "multi-worlds" update.
    // It will then be `nil`. You can enable the Multi-worlds advanced project option to enable
    // the change immediately.  Default new level height
    default_level_height:   Maybe(int) `json:"defaultLevelHeight"`,
    // **WARNING**: this field will move to the `worlds` array after the "multi-worlds" update.
    // It will then be `nil`. You can enable the Multi-worlds advanced project option to enable
    // the change immediately.  Default new level width
    default_level_width:    Maybe(int) `json:"defaultLevelWidth"`,
    // Default X pivot (0 to 1) for new entities
    default_pivot_x:        f32 `json:"defaultPivotX"`,
    // Default Y pivot (0 to 1) for new entities
    default_pivot_y:        f32 `json:"defaultPivotY"`,
    // A structure containing all the definitions of this project
    defs:                   Definitions `json:"defs"`,
    // If the project isn't in MultiWorlds mode, this is the IID of the internal "dummy" World.
    dummy_world_iid:        string `json:"dummyWorldIid"`,
    // If TRUE, the exported PNGs will include the level background (color or image).
    export_level_bg:        bool `json:"exportLevelBg"`,
    // **WARNING**: this deprecated value is no longer exported since version 0.9.3  Replaced
    // by: `imageExportMode`
    export_png:             Maybe(bool) `json:"exportPng"`,
    // If TRUE, a Tiled compatible file will also be generated along with the LDtk JSON file
    // (default is FALSE)
    export_tiled:           bool `json:"exportTiled"`,
    // If TRUE, one file will be saved for the project (incl. all its definitions) and one file
    // in a sub-folder for each level.
    external_levels:        bool `json:"externalLevels"`,
    // An array containing various advanced flags (ie. options or other states). Possible
    // values: `DiscardPreCsvIntGrid`, `ExportOldTableOfContentData`,
    // `ExportPreCsvIntGridFormat`, `IgnoreBackupSuggest`, `PrependIndexToLevelFileNames`,
    // `MultiWorlds`, `UseMultilinesType`
    flags:                  []Flag `json:"flags"`,
    // Naming convention for Identifiers (first-letter uppercase, full uppercase etc.) Possible
    // values: `Capitalize`, `Uppercase`, `Lowercase`, `Free`
    identifier_style:       Identifier_Style `json:"identifierStyle"`,
    // Unique project identifier
    iid:                    string `json:"iid"`,
    // "Image export" option when saving project. Possible values: `None`, `OneImagePerLayer`,
    // `OneImagePerLevel`, `LayersAndLevels`
    image_export_mode:      Image_Export_Mode `json:"imageExportMode"`,
    // File format version
    json_version:           string `json:"jsonVersion"`,
    // The default naming convention for level identifiers.
    level_name_pattern:     string `json:"levelNamePattern"`,
    // All levels. The order of this array is only relevant in `LinearHorizontal` and
    // `linearVertical` world layouts (see `worldLayout` value).  Otherwise, you should
    // refer to the `worldX`,`worldY` coordinates of each Level.
    levels:                 []Level `json:"levels"`,
    // If TRUE, the Json is partially minified (no indentation, nor line breaks, default is
    // FALSE)
    minify_json:            bool `json:"minifyJson"`,
    // Next Unique integer ID available
    next_uid:               int `json:"nextUid"`,
    // File naming pattern for exported PNGs
    png_file_pattern:       string `json:"pngFilePattern"`,
    // If TRUE, a very simplified will be generated on saving, for quicker & easier engine
    // integration.
    simplified_export:      bool `json:"simplifiedExport"`,
    // All instances of entities that have their `exportToToc` flag enabled are listed in this
    // array.
    toc:                    []Table_Of_Content_Entry `json:"toc"`,
    // This optional description is used by LDtk Samples to show up some informations and
    // instructions.
    tutorial_desc:          string `json:"tutorialDesc"`,
    // **WARNING**: this field will move to the `worlds` array after the "multi-worlds" update.
    // It will then be `nil`. You can enable the Multi-worlds advanced project option to enable
    // the change immediately.  Height of the world grid in pixels.
    world_grid_height:      Maybe(int) `json:"worldGridHeight"`,
    // **WARNING**: this field will move to the `worlds` array after the "multi-worlds" update.
    // It will then be `nil`. You can enable the Multi-worlds advanced project option to enable
    // the change immediately.  Width of the world grid in pixels.
    world_grid_width:       Maybe(int) `json:"worldGridWidth"`,
    // **WARNING**: this field will move to the `worlds` array after the "multi-worlds" update.
    // It will then be `nil`. You can enable the Multi-worlds advanced project option to enable
    // the change immediately.  An enum that describes how levels are organized in
    // this project (ie. linearly or in a 2D space). Possible values: <`nil`>, `Free`,
    // `GridVania`, `LinearHorizontal`, `LinearVertical`
    world_layout:           Maybe(World_Layout) `json:"worldLayout"`,
    // This array will be empty, unless you enable the Multi-Worlds in the project advanced
    // settings. - in current version, a LDtk project file can only contain a single
    // world with multiple levels in it. In this case, levels and world layout related settings
    // are stored in the root of the JSON. - with "Multi-worlds" enabled, there will be a
    // `worlds` array in root, each world containing levels and layout settings. Basically, it's
    // pretty much only about moving the `levels` array to the `worlds` array, along with world
    // layout related values (eg. `worldGridWidth` etc).If you want to start
    // supporting this future update easily, please refer to this documentation:
    // https://github.com/deepnight/ldtk/issues/231
    worlds:                 []World `json:"worlds"`,
}


// This section contains all the level data. It can be found in 2 distinct forms, depending
// on Project current settings:  - If "*Separate level files*" is **disabled** (default):
// full level data is *embedded* inside the main Project JSON file, - If "*Separate level
// files*" is **enabled**: level data is stored in *separate* standalone `.ldtkl` files (one
// per level). In this case, the main Project JSON file will still contain most level data,
// except heavy sections, like the `layerInstances` array (which will be nil). The
// `externalRelPath` string points to the `ldtkl` file.  A `ldtkl` file is just a JSON file
// containing exactly what is described below.
Level :: struct {
    // Background color of the level (same as `bgColor`, except the default value is
    // automatically used here if its value is `nil`)
    bg_color:            string `json:"bgColor"`,
    // Position informations of the background image, if there is one.
    bg_pos:              Maybe(Level_Background_Position) `json:"__bgPos"`,
    // An array listing all other levels touching this one on the world map. Since 1.4.0, this
    // includes levels that overlap in the same world layer, or in nearby world layers.
    // Only relevant for world layouts where level spatial positioning is manual (ie. GridVania,
    // Free). For Horizontal and Vertical layouts, this array is always empty.
    neighbours:          []Neighbour_Level `json:"__neighbours"`,
    // The "guessed" color for this level in the editor, decided using either the background
    // color or an existing custom field.
    smart_color:         string `json:"__smartColor"`,
    // Background image X pivot (0-1)
    bg_pivot_x:          f32 `json:"bgPivotX"`,
    // Background image Y pivot (0-1)
    bg_pivot_y:          f32 `json:"bgPivotY"`,
    // An enum defining the way the background image (if any) is positioned on the level. See
    // `__bgPos` for resulting position info. Possible values: <`nil`>, `Unscaled`,
    // `Contain`, `Cover`, `CoverDirty`, `Repeat`
    bg_pos_type:         Maybe(Bg_Pos) `json:"bgPos"`,
    // The *optional* relative path to the level background image.
    bg_rel_path:         string `json:"bgRelPath"`,
    // This value is not nil if the project option "*Save levels separately*" is enabled. In
    // this case, this **relative** path points to the level Json file.
    external_rel_path:   string `json:"externalRelPath"`,
    // An array containing this level custom field values.
    field_instances:     []Field_Instance `json:"fieldInstances"`,
    // User defined unique identifier
    identifier:          string `json:"identifier"`,
    // Unique instance identifier
    iid:                 string `json:"iid"`,
    // An array containing all Layer instances. **IMPORTANT**: if the project option "*Save
    // levels separately*" is enabled, this field will be `nil`.  This array is **sorted
    // in display order**: the 1st layer is the top-most and the last is behind.
    layer_instances:     []Layer_Instance `json:"layerInstances"`,
    // Height of the level in pixels
    px_height:           int `json:"pxHei"`,
    // Width of the level in pixels
    px_width:            int `json:"pxWid"`,
    // Unique Int identifier
    uid:                 int `json:"uid"`,
    // If TRUE, the level identifier will always automatically use the naming pattern as defined
    // in `Project.levelNamePattern`. Becomes FALSE if the identifier is manually modified by
    // user.
    use_auto_identifier: bool `json:"useAutoIdentifier"`,
    // Index that represents the "depth" of the level in the world. Default is 0, greater means
    // "above", lower means "below".  This value is mostly used for display only and is
    // intended to make stacking of levels easier to manage.
    world_depth:         int `json:"worldDepth"`,
    // World X coordinate in pixels.  Only relevant for world layouts where level spatial
    // positioning is manual (ie. GridVania, Free). For Horizontal and Vertical layouts, the
    // value is always -1 here.
    world_x:             int `json:"worldX"`,
    // World Y coordinate in pixels.  Only relevant for world layouts where level spatial
    // positioning is manual (ie. GridVania, Free). For Horizontal and Vertical layouts, the
    // value is always -1 here.
    world_y:             int `json:"worldY"`,
}

// If you're writing your own LDtk importer, you should probably just ignore *most* stuff in
// the `defs` section, as it contains data that are mostly important to the editor. To keep
// you away from the `defs` section and avoid some unnecessary JSON parsing, important data
// from definitions is often duplicated in fields prefixed with a double underscore (eg.
// `__identifier` or `__type`).  The 2 only definition types you might need here are
// **Tilesets** and **Enums**.
//
// A structure containing all the definitions of this project
Definitions :: struct {
    // All entities definitions, including their custom fields
    entities:       []Entity_Definition `json:"entities"`,
    // All internal enums
    enums:          []Enum_Definition `json:"enums"`,
    // Note: external enums are exactly the same as `enums`, except they have a `relPath` to
    // point to an external source file.
    external_enums: []Enum_Definition `json:"externalEnums"`,
    // All layer definitions
    layers:         []Layer_Definition `json:"layers"`,
    // All custom fields available to all levels.
    level_fields:   []Field_Definition `json:"levelFields"`,
    // All tilesets
    tilesets:       []Tileset_Definition `json:"tilesets"`,
}


Entity_Definition :: struct {
    // If enabled, this entity is allowed to stay outside of the current level bounds
    allow_out_of_bounds: bool `json:"allowOutOfBounds"`,
    // Base entity color
    color:               string `json:"color"`,
    // User defined documentation for this element to provide help/tips to level designers.
    doc:                 string `json:"doc"`,
    // If enabled, all instances of this entity will be listed in the project "Table of content"
    // object.
    export_to_toc:       bool `json:"exportToToc"`,
    // Array of field definitions
    field_defs:          []Field_Definition `json:"fieldDefs"`,
    fill_opacity:        f32 `json:"fillOpacity"`,
    // Pixel height
    height:              int `json:"height"`,
    hollow:              bool `json:"hollow"`,
    // User defined unique identifier
    identifier:          string `json:"identifier"`,
    // Only applies to entities resizable on both X/Y. If TRUE, the entity instance width/height
    // will keep the same aspect ratio as the definition.
    keep_aspect_ratio:   bool `json:"keepAspectRatio"`,
    // Possible values: `DiscardOldOnes`, `PreventAdding`, `MoveLastOne`
    limit_behavior:      Limit_Behavior `json:"limitBehavior"`,
    // If TRUE, the maxCount is a "per world" limit, if FALSE, it's a "per level". Possible
    // values: `PerLayer`, `PerLevel`, `PerWorld`
    limit_scope:         Limit_Scope `json:"limitScope"`,
    line_opacity:        f32 `json:"lineOpacity"`,
    // Max instances count
    max_count:           int `json:"maxCount"`,
    // Max pixel height (only applies if the entity is resizable on Y)
    max_height:          Maybe(int) `json:"maxHeight"`,
    // Max pixel width (only applies if the entity is resizable on X)
    max_width:           Maybe(int) `json:"maxWidth"`,
    // Min pixel height (only applies if the entity is resizable on Y)
    min_height:          Maybe(int) `json:"minHeight"`,
    // Min pixel width (only applies if the entity is resizable on X)
    min_width:           Maybe(int) `json:"minWidth"`,
    // An array of 4 dimensions for the up/right/down/left borders (in this order) when using
    // 9-slice mode for `tileRenderMode`.  If the tileRenderMode is not NineSlice, then
    // this array is empty.  See: https://en.wikipedia.org/wiki/9-slice_scaling
    nine_slice_borders:  []int `json:"nineSliceBorders"`,
    // Pivot X coordinate (from 0 to 1.0)
    pivot_x:             f32 `json:"pivotX"`,
    // Pivot Y coordinate (from 0 to 1.0)
    pivot_y:             f32 `json:"pivotY"`,
    // Possible values: `Rectangle`, `Ellipse`, `Tile`, `Cross`
    render_mode:         Render_Mode `json:"renderMode"`,
    // If TRUE, the entity instances will be resizable horizontally
    resizable_x:         bool `json:"resizableX"`,
    // If TRUE, the entity instances will be resizable vertically
    resizable_y:         bool `json:"resizableY"`,
    // Display entity name in editor
    show_name:           bool `json:"showName"`,
    // An array of strings that classifies this entity
    tags:                []string `json:"tags"`,
    // **WARNING**: this deprecated value is no longer exported since version 1.2.0  Replaced
    // by: `tileRect`
    tile_id:             Maybe(int) `json:"tileId"`,
    tile_opacity:        f32 `json:"tileOpacity"`,
    // An object representing a rectangle from an existing Tileset
    tile_rect:           Maybe(Tileset_Rectangle) `json:"tileRect"`,
    // An enum describing how the the Entity tile is rendered inside the Entity bounds. Possible
    // values: `Cover`, `FitInside`, `Repeat`, `Stretch`, `FullSizeCropped`,
    // `FullSizeUncropped`, `NineSlice`
    tile_render_mode:    Tile_Render_Mode `json:"tileRenderMode"`,
    // Tileset ID used for optional tile display
    tileset_id:          Maybe(int) `json:"tilesetId"`,
    // Unique Int identifier
    uid:                 int `json:"uid"`,
    // This tile overrides the one defined in `tileRect` in the UI
    ui_tile_rect:        Maybe(Tileset_Rectangle) `json:"uiTileRect"`,
    // Pixel width
    width:               int `json:"width"`,
}


Layer_Definition :: struct {
    // Type of the layer (*IntGrid, Entities, Tiles or AutoLayer*)
    type:                                 Type `json:"type"`,
    // Contains all the auto-layer rule definitions.
    auto_rule_groups:                     []Auto_Layer_Rule_Group `json:"autoRuleGroups"`,
    auto_source_layer_def_uid:            Maybe(int) `json:"autoSourceLayerDefUid"`,
    // **WARNING**: this deprecated value is no longer exported since version 1.2.0  Replaced
    // by: `tilesetDefUid`
    auto_tileset_def_uid:                 Maybe(int) `json:"autoTilesetDefUid"`,
    auto_tiles_killed_by_other_layer_uid: Maybe(int) `json:"autoTilesKilledByOtherLayerUid"`,
    biome_field_uid:                      Maybe(int) `json:"biomeFieldUid"`,
    // Allow editor selections when the layer is not currently active.
    can_select_when_inactive:             bool `json:"canSelectWhenInactive"`,
    // Opacity of the layer (0 to 1.0)
    display_opacity:                      f32 `json:"displayOpacity"`,
    // User defined documentation for this element to provide help/tips to level designers.
    doc:                                  string `json:"doc"`,
    // An array of tags to forbid some Entities in this layer
    excluded_tags:                        []string `json:"excludedTags"`,
    // Width and height of the grid in pixels
    grid_size:                            int `json:"gridSize"`,
    // Height of the optional "guide" grid in pixels
    guide_grid_height:                    int `json:"guideGridHei"`,
    // Width of the optional "guide" grid in pixels
    guide_grid_width:                     int `json:"guideGridWid"`,
    hide_fields_when_inactive:            bool `json:"hideFieldsWhenInactive"`,
    // Hide the layer from the list on the side of the editor view.
    hide_in_list:                         bool `json:"hideInList"`,
    // User defined unique identifier
    identifier:                           string `json:"identifier"`,
    // Alpha of this layer when it is not the active one.
    inactive_opacity:                     f32 `json:"inactiveOpacity"`,
    // An array that defines extra optional info for each IntGrid value.  WARNING: the
    // array order is not related to actual IntGrid values! As user can re-order IntGrid values
    // freely, you may value "2" before value "1" in this array.
    int_grid_values:                      []Int_Grid_Value_Definition `json:"intGridValues"`,
    // Group informations for IntGrid values
    int_grid_values_groups:               []Int_Grid_Value_Group_Definition `json:"intGridValuesGroups"`,
    // Parallax horizontal factor (from -1 to 1, defaults to 0) which affects the scrolling
    // speed of this layer, creating a fake 3D (parallax) effect.
    parallax_factor_x:                    f32 `json:"parallaxFactorX"`,
    // Parallax vertical factor (from -1 to 1, defaults to 0) which affects the scrolling speed
    // of this layer, creating a fake 3D (parallax) effect.
    parallax_factor_y:                    f32 `json:"parallaxFactorY"`,
    // If true (default), a layer with a parallax factor will also be scaled up/down accordingly.
    parallax_scaling:                     bool `json:"parallaxScaling"`,
    // X offset of the layer, in pixels (IMPORTANT: this should be added to the `LayerInstance`
    // optional offset)
    px_offset_x:                          int `json:"pxOffsetX"`,
    // Y offset of the layer, in pixels (IMPORTANT: this should be added to the `LayerInstance`
    // optional offset)
    px_offset_y:                          int `json:"pxOffsetY"`,
    // If TRUE, the content of this layer will be used when rendering levels in a simplified way
    // for the world view
    render_in_world_view:                 bool `json:"renderInWorldView"`,
    // An array of tags to filter Entities that can be added to this layer
    required_tags:                        []string `json:"requiredTags"`,
    // If the tiles are smaller or larger than the layer grid, the pivot value will be used to
    // position the tile relatively its grid cell.
    tile_pivot_x:                         f32 `json:"tilePivotX"`,
    // If the tiles are smaller or larger than the layer grid, the pivot value will be used to
    // position the tile relatively its grid cell.
    tile_pivot_y:                         f32 `json:"tilePivotY"`,
    // Reference to the default Tileset UID being used by this layer definition.
    // **WARNING**: some layer *instances* might use a different tileset. So most of the time,
    // you should probably use the `__tilesetDefUid` value found in layer instances.  Note:
    // since version 1.0.0, the old `autoTilesetDefUid` was removed and merged into this value.
    tileset_def_uid:                      Maybe(int) `json:"tilesetDefUid"`,
    // Type of the layer as Haxe Enum Possible values: `IntGrid`, `Entities`, `Tiles`,
    // `AutoLayer`
    layer_type:                           Type `json:"type"`,
    // User defined color for the UI
    ui_color:                             string `json:"uiColor"`,
    // Unique Int identifier
    uid:                                  int `json:"uid"`,
    // Display tags
    ui_filter_tags:                       []string `json:"uiFilterTags"`,
    // Asynchronous rendering option for large/complex layers
    use_async_render:                     bool `json:"useAsyncRender"`,
}


Auto_Layer_Rule_Group :: struct {
    active:                 bool `json:"active"`,
    biome_requirement_mode: int `json:"biomeRequirementMode"`,
    // *This field was removed in 1.0.0 and should no longer be used.*
    collapsed:              Maybe(bool) `json:"collapsed"`,
    color:                  string `json:"color"`,
    icon:                   Maybe(Tileset_Rectangle) `json:"icon"`,
    is_optional:            bool `json:"isOptional"`,
    name:                   string `json:"name"`,
    required_biome_values:  []string `json:"requiredBiomeValues"`,
    rules:                  []Auto_Layer_Rule_Definition `json:"rules"`,
    uid:                    int `json:"uid"`,
    uses_wizard:            bool `json:"usesWizard"`,
}

Auto_Layer_Rule_Definition :: struct {
    // If FALSE, the rule effect isn't applied, and no tiles are generated.
    active:              bool `json:"active"`,
    alpha:               f32 `json:"alpha"`,
    // When TRUE, the rule will prevent other rules to be applied in the same cell if it matches
    // (TRUE by default).
    break_on_match:      bool `json:"breakOnMatch"`,
    // Chances for this rule to be applied (0 to 1)
    chance:              f32 `json:"chance"`,
    // Checker mode Possible values: `None`, `Horizontal`, `Vertical`
    checker:             Checker `json:"checker"`,
    // If TRUE, allow rule to be matched by flipping its pattern horizontally
    flip_x:              bool `json:"flipX"`,
    // If TRUE, allow rule to be matched by flipping its pattern vertically
    flip_y:              bool `json:"flipY"`,
    // If TRUE, then the rule should be re-evaluated by the editor at one point
    invalidated:         bool `json:"invalidated"`,
    // Default IntGrid value when checking cells outside of level bounds
    out_of_bounds_value: Maybe(int) `json:"outOfBoundsValue"`,
    // Rule pattern (size x size)
    pattern:             []int `json:"pattern"`,
    // If TRUE, enable Perlin filtering to only apply rule on specific random area
    perlin_active:       bool `json:"perlinActive"`,
    perlin_octaves:      f32 `json:"perlinOctaves"`,
    perlin_scale:        f32 `json:"perlinScale"`,
    perlin_seed:         f32 `json:"perlinSeed"`,
    // X pivot of a tile stamp (0-1)
    pivot_x:             f32 `json:"pivotX"`,
    // Y pivot of a tile stamp (0-1)
    pivot_y:             f32 `json:"pivotY"`,
    // Pattern width & height. Should only be 1,3,5 or 7.
    size:                int `json:"size"`,
    // **WARNING**: this deprecated value is no longer exported since version 1.5.0  Replaced
    // by: `tileRectsIds`
    tile_ids:            []int `json:"tileIds"`,
    // Defines how tileIds array is used Possible values: `Single`, `Stamp`
    tile_mode:           Tile_Mode `json:"tileMode"`,
    // Max random offset for X tile pos
    tile_random_x_max:   int `json:"tileRandomXMax"`,
    // Min random offset for X tile pos
    tile_random_x_min:   int `json:"tileRandomXMin"`,
    // Max random offset for Y tile pos
    tile_random_y_max:   int `json:"tileRandomYMax"`,
    // Min random offset for Y tile pos
    tile_random_y_min:   int `json:"tileRandomYMin"`,
    // Array containing all the possible tile IDs rectangles (picked randomly).
    tile_rects_ids:      [][]int `json:"tileRectsIds"`,
    // Tile X offset
    tile_x_offset:       int `json:"tileXOffset"`,
    // Tile Y offset
    tile_y_offset:       int `json:"tileYOffset"`,
    // Unique Int identifier
    uid:                 int `json:"uid"`,
    // X cell coord modulo
    x_modulo:            int `json:"xModulo"`,
    // X cell start offset
    x_offset:            int `json:"xOffset"`,
    // Y cell coord modulo
    y_modulo:            int `json:"yModulo"`,
    // Y cell start offset
    y_offset:            int `json:"yOffset"`,
}

// IntGrid value definition
Int_Grid_Value_Definition :: struct {
    color:      string `json:"color"`,
    // Parent group identifier (0 if none)
    group_uid:  int `json:"groupUid"`,
    // User defined unique identifier
    identifier: string `json:"identifier"`,
    tile:       Maybe(Tileset_Rectangle) `json:"__tile"`,
    // The IntGrid value itself
    value:      int `json:"value"`,
}


Int_Grid_Value_Group_Definition :: struct {
    // User defined color
    color:      string `json:"color"`,
    // User defined string identifier
    identifier: string `json:"identifier"`,
    // Group unique ID
    uid:        int `json:"uid"`,
}


// The `Tileset` definition is the most important part among project definitions. It
// contains some extra informations about each integrated tileset. If you only had to parse
// one definition section, that would be the one.
Tileset_Definition :: struct {
    // Grid-based height
    c_height:             int `json:"__cHei"`,
    // Grid-based width
    c_width:              int `json:"__cWid"`,
    // The following data is used internally for various optimizations. It's always synced with
    // source image changes.
    cached_pixel_data:    Maybe(map[string]Maybe(json.Value)) `json:"cachedPixelData"`,
    // An array of custom tile metadata
    custom_data:          []Tile_Custom_Metadata `json:"customData"`,
    // If this value is set, then it means that this atlas uses an internal LDtk atlas image
    // instead of a loaded one. Possible values: <`nil`>, `LdtkIcons`
    embed_atlas:          Maybe(Embed_Atlas) `json:"embedAtlas"`,
    // Tileset tags using Enum values specified by `tagsSourceEnumId`. This array contains 1
    // element per Enum value, which contains an array of all Tile IDs that are tagged with it.
    enum_tags:            []Enum_Tag_Value `json:"enumTags"`,
    // User defined unique identifier
    identifier:           string `json:"identifier"`,
    // Distance in pixels from image borders
    padding:              int `json:"padding"`,
    // Image height in pixels
    px_height:            int `json:"pxHei"`,
    // Image width in pixels
    px_width:             int `json:"pxWid"`,
    // Path to the source file, relative to the current project JSON file  It can be nil
    // if no image was provided, or when using an embed atlas.
    rel_path:             string `json:"relPath"`,
    // Array of group of tiles selections, only meant to be used in the editor
    saved_selections:     []map[string]Maybe(json.Value) `json:"savedSelections"`,
    // Space in pixels between all tiles
    spacing:              int `json:"spacing"`,
    // An array of user-defined tags to organize the Tilesets
    tags:                 []string `json:"tags"`,
    // Optional Enum definition UID used for this tileset meta-data
    tags_source_enum_uid: Maybe(int) `json:"tagsSourceEnumUid"`,
    tile_grid_size:       int `json:"tileGridSize"`,
    // Unique Intidentifier
    uid:                  int `json:"uid"`,
}

// In a tileset definition, user defined meta-data of a tile.
Tile_Custom_Metadata :: struct {
    data:    string `json:"data"`,
    tile_id: int `json:"tileId"`,
}

// In a tileset definition, enum based tag infos
Enum_Tag_Value :: struct {
    enum_value_id: string `json:"enumValueId"`,
    tile_ids:      []int `json:"tileIds"`,
}

// This object describes the "location" of an Entity instance in the project worlds.
//
// IID information of this instance
Entity_Instance :: struct {
    grid:            [2]int `json:"__grid"`,
    // Entity definition identifier
    identifier:      string `json:"__identifier"`,
    // Pivot coordinates  (`[x,y]` format, values are from 0 to 1) of the Entity
    pivot:           [2]f32 `json:"__pivot"`,
    // The entity "smart" color, guessed from either Entity definition, or one its field
    // instances.
    smart_color:     string `json:"__smartColor"`,
    // Array of tags defined in this Entity definition
    tags:            []string `json:"__tags"`,
    // Optional TilesetRect used to display this entity (it could either be the default Entity
    // tile, or some tile provided by a field value, like an Enum).
    tile:            Maybe(Tileset_Rectangle) `json:"__tile"`,
    // X world coordinate in pixels. Only available in GridVania or Free world layouts.
    world_x:         Maybe(int) `json:"worldX"`,
    // Y world coordinate in pixels Only available in GridVania or Free world layouts.
    world_y:         Maybe(int) `json:"worldY"`,
    // Reference of the **Entity definition** UID
    def_uid:         int `json:"defUid"`,
    // An array of all custom fields and their values.
    field_instances: []Field_Instance `json:"fieldInstances"`,
    // Entity height in pixels. For non-resizable entities, it will be the same as Entity
    // definition.
    height:          int `json:"height"`,
    // Unique instance identifier
    iid:             string `json:"iid"`,
    // Pixel coordinates (`[x,y]` format) in current level coordinate space. Don't forget
    // optional layer offsets, if they exist!
    px:              [2]int `json:"px"`,
    // Entity width in pixels. For non-resizable entities, it will be the same as Entity
    // definition.
    width:           int `json:"width"`,
}


Field_Instance :: struct {
    // Field definition identifier
    identifier:         string `json:"__identifier"`,
    // Optional TilesetRect used to display this field (this can be the field own Tile, or some
    // other Tile guessed from the value, like an Enum).
    tile:               Maybe(Tileset_Rectangle) `json:"tile"`,
    // Type of the field, such as `Int`, `Float`, Boolean, string, etc.
    type:               string `json:"__type"`,
    // Actual value of the field instance. The value type varies, depending on `__type`:
    // - For **classic types** (ie. Integer, Float, Boolean, string, Text and FilePath), you
    // just get the actual value with the expected type.   - For **Color**, the value is an
    // hexadecimal string using "#rrggbb" format.   - For **Enum**, the value is a string
    // representing the selected enum value.   - For **Point**, the value is a
    // [GridPoint](#ldtk-GridPoint) object.   - For **Tile**, the value is a
    // [TilesetRect](#ldtk-TilesetRect) object.   - For **EntityRef**, the value is an
    // [EntityReferenceInfos](#ldtk-EntityReferenceInfos) object.  If the field is an
    // array, then this `__value` will also be a JSON array.
    value:              Maybe(json.Value) `json:"__value"`,
    // Reference of the **Field definition** UID
    def_uid:            int `json:"defUid"`,
    // Editor internal raw values
    real_editor_values: []Maybe(json.Value) `json:"realEditorValues"`,
}


// This object describes the "location" of an Entity instance in the project worlds.
//
// IID of the refered EntityInstance
Reference_To_An_Entity_Instance :: struct {
    // IID of the refered EntityInstance
    entity_iid: string `json:"entityIid"`,
    // IID of the LayerInstance containing the refered EntityInstance
    layer_iid:  string `json:"layerIid"`,
    // IID of the Level containing the refered EntityInstance
    level_iid:  string `json:"levelIid"`,
    // IID of the World containing the refered EntityInstance
    world_iid:  string `json:"worldIid"`,
}

// This object is just a grid-based coordinate used in Field values.
Grid_Point :: struct {
    // X grid-based coordinate
    cx: int `json:"cx"`,
    // Y grid-based coordinate
    cy: int `json:"cy"`,
}

// IntGrid value instance
Int_Grid_Value_Instance :: struct {
    // Coordinate ID in the layer grid
    coord_id: int `json:"coordId"`,
    // IntGrid value
    v:        int `json:"v"`,
}


Layer_Instance :: struct {
    // Grid-based height
    c_height:             int `json:"__cHei"`,
    // Grid-based width
    c_width:              int `json:"__cWid"`,
    // Grid size
    grid_size:            int `json:"__gridSize"`,
    // Layer definition identifier
    identifier:           string `json:"__identifier"`,
    // Layer opacity as Float [0-1]
    opacity:              f32 `json:"__opacity"`,
    // Total layer X pixel offset, including both instance and definition offsets.
    px_total_offset_x:    int `json:"__pxTotalOffsetX"`,
    // Total layer Y pixel offset, including both instance and definition offsets.
    px_total_offset_y:    int `json:"__pxTotalOffsetY"`,
    // The definition UID of corresponding Tileset, if any.
    tileset_def_uid:      Maybe(int) `json:"__tilesetDefUid"`,
    // The relative path to corresponding Tileset, if any.
    tileset_rel_path:     string `json:"__tilesetRelPath"`,
    // Layer type (possible values: IntGrid, Entities, Tiles or AutoLayer)
    type:                 Type `json:"__type"`,
    // An array containing all tiles generated by Auto-layer rules. The array is already sorted
    // in display order (ie. 1st tile is beneath 2nd, which is beneath 3rd etc.).
    // Note: if multiple tiles are stacked in the same cell as the result of different rules,
    // all tiles behind opaque ones will be discarded.
    auto_layer_tiles:     []Tile_Instance `json:"autoLayerTiles"`,
    entity_instances:     []Entity_Instance `json:"entityInstances"`,
    grid_tiles:           []Tile_Instance `json:"gridTiles"`,
    // Unique layer instance identifier
    iid:                  string `json:"iid"`,
    // **WARNING**: this deprecated value is no longer exported since version 1.0.0  Replaced
    // by: `intGridCsv`
    int_grid:             []Int_Grid_Value_Instance `json:"intGrid"`,
    // A list of all values in the IntGrid layer, stored in CSV format (Comma Separated
    // Values).  Order is from left to right, and top to bottom (ie. first row from left to
    // right, followed by second row, etc).  `0` means "empty cell" and IntGrid values
    // start at 1.  The array size is `__cWid` x `__cHei` cells.
    int_grid_csv:         []int `json:"intGridCsv"`,
    // Reference the Layer definition UID
    layer_def_uid:        int `json:"layerDefUid"`,
    // Reference to the UID of the level containing this layer instance
    level_id:             int `json:"levelId"`,
    // An Array containing the UIDs of optional rules that were enabled in this specific layer
    // instance.
    optional_rules:       []int `json:"optionalRules"`,
    // This layer can use another tileset by overriding the tileset UID here.
    override_tileset_uid: Maybe(int) `json:"overrideTilesetUid"`,
    // X offset in pixels to render this layer, usually 0 (IMPORTANT: this should be added to
    // the `LayerDef` optional offset, so you should probably prefer using `__pxTotalOffsetX`
    // which contains the total offset value)
    px_offset_x:          int `json:"pxOffsetX"`,
    // Y offset in pixels to render this layer, usually 0 (IMPORTANT: this should be added to
    // the `LayerDef` optional offset, so you should probably prefer using `__pxTotalOffsetX`
    // which contains the total offset value)
    px_offset_y:          int `json:"pxOffsetY"`,
    // Random seed used for Auto-Layers rendering
    seed:                 int `json:"seed"`,
    // Layer instance visibility
    visible:              bool `json:"visible"`,
}


Tile_Instance :: struct {
    // Alpha/opacity of the tile (0-1, defaults to 1)
    a:   f32 `json:"a"`,
    // Internal data used by the editor.  For auto-layer tiles: `[ruleId, coordId]`.
    // For tile-layer tiles: `[coordId]`.
    d:   []int `json:"d"`,
    // "Flip bits", a 2-bits integer to represent the mirror transformations of the tile.
    // - Bit 0 = X flip   - Bit 1 = Y flip   Examples: f=0 (no flip), f=1 (X flip
    // only), f=2 (Y flip only), f=3 (both flips)
    f:   int `json:"f"`,
    // Pixel coordinates of the tile in the **layer** (`[x,y]` format). Don't forget optional
    // layer offsets, if they exist!
    px:  [2]int `json:"px"`,
    // Pixel coordinates of the tile in the **tileset** (`[x,y]` format)
    src: [2]int `json:"src"`,
    // The *Tile ID* in the corresponding tileset.
    t:   int `json:"t"`,
}


Level_Background_Position :: struct {
    // An array of 4 float values describing the cropped sub-rectangle of the displayed
    // background image. This cropping happens when original is larger than the level bounds.
    // Array format: `[ cropX, cropY, cropWidth, cropHeight ]`
    crop_rect:   []f32 `json:"cropRect"`,
    // An array containing the `[scaleX,scaleY]` values of the **cropped** background image,
    // depending on `bgPos` option.
    scale:       []f32 `json:"scale"`,
    // An array containing the `[x,y]` pixel coordinates of the top-left corner of the
    // **cropped** background image, depending on `bgPos` option.
    top_left_px: []int `json:"topLeftPx"`,
}


Neighbour_Level :: struct {
    // A lowercase string tipping on the level location (`n`orth, `s`outh, `w`est,
    // `e`ast).  Since 1.4.0, this value can also be `<` (neighbour depth is lower), `>`
    // (neighbour depth is greater) or `o` (levels overlap and share the same world
    // depth).  Since 1.5.3, this value can also be `nw`,`ne`,`sw` or `se` for levels only
    // touching corners.
    dir:       string `json:"dir"`,
    // Neighbour Instance Identifier
    level_iid: string `json:"levelIid"`,
    // **WARNING**: this deprecated value is no longer exported since version 1.2.0  Replaced
    // by: `levelIid`
    level_uid: Maybe(int) `json:"levelUid"`,
}


Table_Of_Content_Entry :: struct {
    identifier:     string `json:"identifier"`,
    // **WARNING**: this deprecated value will be *removed* completely on version 1.7.0+
    // Replaced by: `instancesData`
    instances:      []Reference_To_An_Entity_Instance `json:"instances"`,
    instances_data: []Toc_Instance_Data `json:"instancesData"`,
}


Field_Definition :: struct {
    // Human readable value type. Possible values: `Int, Float, string, Bool, Color,
    // ExternEnum.XXX, LocalEnum.XXX, Point, FilePath`.  If the field is an array, this
    // field will look like `Array<...>` (eg. `Array<Int>`, `Array<Point>` etc.)  NOTE: if
    // you enable the advanced option **Use Multilines type**, you will have "*Multilines*"
    // instead of "*string*" when relevant.
    type_string:             string `json:"__type"`,
    // Optional list of accepted file extensions for FilePath value type. Includes the dot:
    // `.ext`
    accept_file_types:       []string `json:"acceptFileTypes"`,
    // Possible values: `Any`, `OnlySame`, `OnlyTags`, `OnlySpecificEntity`
    allowed_refs:            Allowed_Refs `json:"allowedRefs"`,
    allowed_refs_entity_uid: Maybe(int) `json:"allowedRefsEntityUid"`,
    allowed_ref_tags:        []string `json:"allowedRefTags"`,
    allow_out_of_level_ref:  bool `json:"allowOutOfLevelRef"`,
    // Array max length
    array_max_length:        Maybe(int) `json:"arrayMaxLength"`,
    // Array min length
    array_min_length:        Maybe(int) `json:"arrayMinLength"`,
    auto_chain_ref:          bool `json:"autoChainRef"`,
    // TRUE if the value can be nil. For arrays, TRUE means it can contain nil values
    // (exception: array of Points can't have nil values).
    can_be_null:             bool `json:"canBeNull"`,
    // Default value if selected value is nil or invalid.
    default_override:        Maybe(json.Value) `json:"defaultOverride"`,
    // User defined documentation for this field to provide help/tips to level designers about
    // accepted values.
    doc:                     string `json:"doc"`,
    editor_always_show:      bool `json:"editorAlwaysShow"`,
    editor_cut_long_values:  bool `json:"editorCutLongValues"`,
    editor_display_color:    string `json:"editorDisplayColor"`,
    // Possible values: `Hidden`, `ValueOnly`, `NameAndValue`, `EntityTile`, `LevelTile`,
    // `Points`, `PointStar`, `PointPath`, `PointPathLoop`, `RadiusPx`, `RadiusGrid`,
    // `ArrayCountWithLabel`, `ArrayCountNoLabel`, `RefLinkBetweenPivots`,
    // `RefLinkBetweenCenters`
    editor_display_mode:     Editor_Display_Mode `json:"editorDisplayMode"`,
    // Possible values: `Above`, `Center`, `Beneath`
    editor_display_pos:      Editor_Display_Pos `json:"editorDisplayPos"`,
    editor_display_scale:    f32 `json:"editorDisplayScale"`,
    // Possible values: `ZigZag`, `StraightArrow`, `CurvedArrow`, `ArrowsLine`, `DashedLine`
    editor_link_style:       Editor_Link_Style `json:"editorLinkStyle"`,
    editor_show_in_world:    bool `json:"editorShowInWorld"`,
    editor_text_prefix:      string `json:"editorTextPrefix"`,
    editor_text_suffix:      string `json:"editorTextSuffix"`,
    // If TRUE, the field value will be exported to the `toc` project JSON field. Only applies
    // to Entity fields.
    export_to_toc:           bool `json:"exportToToc"`,
    // User defined unique identifier
    identifier:              string `json:"identifier"`,
    // TRUE if the value is an array of multiple values
    is_array:                bool `json:"isArray"`,
    // Max limit for value, if applicable
    max:                     Maybe(f32) `json:"max"`,
    // Min limit for value, if applicable
    min:                     Maybe(f32) `json:"min"`,
    // Optional regular expression that needs to be matched to accept values. Expected format:
    // `/some_reg_ex/g`, with optional "i" flag.
    regex:                   string `json:"regex"`,
    // If enabled, this field will be searchable through LDtk command palette
    searchable:              bool `json:"searchable"`,
    symmetrical_ref:         bool `json:"symmetricalRef"`,
    // Possible values: <`nil`>, `LangPython`, `LangRuby`, `LangJS`, `LangLua`, `LangC`,
    // `LangHaxe`, `LangMarkdown`, `LangJson`, `LangXml`, `LangLog`
    text_language_mode:      Maybe(Text_Language_Mode) `json:"textLanguageMode"`,
    // UID of the tileset used for a Tile
    tileset_uid:             Maybe(int) `json:"tilesetUid"`,
    // Internal enum representing the possible field types. Possible values: F_Int, F_Float,
    // F_string, F_Text, F_Bool, F_Color, F_Enum(...), F_Point, F_Path, F_EntityRef, F_Tile
    purple_type:             string `json:"type"`,
    // Unique Int identifier
    uid:                     int `json:"uid"`,
    // If TRUE, the color associated with this field will override the Entity or Level default
    // color in the editor UI. For Enum fields, this would be the color associated to their
    // values.
    use_for_smart_color:     bool `json:"useForSmartColor"`,
}

Toc_Instance_Data :: struct {
    // An object containing the values of all entity fields with the `exportToToc` option
    // enabled. This object typing depends on actual field value types.
    fields:  Maybe(json.Value) `json:"fields"`,
    hei_px:  int `json:"heiPx"`,
    // IID information of this instance
    iids:    Reference_To_An_Entity_Instance `json:"iids"`,
    wid_px:  int `json:"widPx"`,
    world_x: int `json:"worldX"`,
    world_y: int `json:"worldY"`,
}

Tileset_Rectangle :: struct {
    // Height in pixels
    h:           int `json:"h"`,
    // UID of the tileset
    tileset_uid: int `json:"tilesetUid"`,
    // Width in pixels
    w:           int `json:"w"`,
    // X pixels coordinate of the top-left corner in the Tileset image
    x:           int `json:"x"`,
    // Y pixels coordinate of the top-left corner in the Tileset image
    y:           int `json:"y"`,
}


Enum_Definition :: struct {
    external_file_checksum: string `json:"externalFileChecksum"`,
    // Relative path to the external file providing this Enum
    external_rel_path:      string `json:"externalRelPath"`,
    // Tileset UID if provided
    icon_tileset_uid:       Maybe(int) `json:"iconTilesetUid"`,
    // User defined unique identifier
    identifier:             string `json:"identifier"`,
    // An array of user-defined tags to organize the Enums
    tags:                   []string `json:"tags"`,
    // Unique Int identifier
    uid:                    int `json:"uid"`,
    // All possible enum values, with their optional Tile infos.
    values:                 []Enum_Value_Definition `json:"values"`,
}

Enum_Value_Definition :: struct {
    // **WARNING**: this deprecated value is no longer exported since version 1.4.0  Replaced
    // by: `tileRect`
    tile_src_rect: Maybe([4]int) `json:"tileSrcRect"`,
    // Optional color
    color:         int `json:"color"`,
    // Enum value
    id:            string `json:"id"`,
    // **WARNING**: this deprecated value is no longer exported since version 1.4.0  Replaced
    // by: `tileRect`
    tile_id:       Maybe(int) `json:"tileId"`,
    // Optional tileset rectangle to represents this value
    tile_rect:     Maybe(Tileset_Rectangle) `json:"tileRect"`,
}

Custom_Command :: struct {
    command: string `json:"command"`,
    // Possible values: `Manual`, `AfterLoad`, `BeforeSave`, `AfterSave`
    when_:   When `json:"when_"`,
}


When :: enum {
    AfterLoad,
    AfterSave,
    BeforeSave,
    Manual,
}

Allowed_Refs :: enum {
    Any,
    OnlySame,
    OnlySpecificEntity,
    OnlyTags,
}

Editor_Display_Mode :: enum {
    ArrayCountNoLabel,
    ArrayCountWithLabel,
    EntityTile,
    Hidden,
    LevelTile,
    NameAndValue,
    PointPath,
    PointPathLoop,
    PointStar,
    Points,
    RadiusGrid,
    RadiusPx,
    RefLinkBetweenCenters,
    RefLinkBetweenPivots,
    ValueOnly,
}

Editor_Display_Pos :: enum {
    Above,
    Beneath,
    Center,
}

Editor_Link_Style :: enum {
    ArrowsLine,
    CurvedArrow,
    DashedLine,
    StraightArrow,
    ZigZag,
}

Text_Language_Mode :: enum {
    LangC,
    LangHaxe,
    LangJs,
    LangJson,
    LangLog,
    LangLua,
    LangMarkdown,
    LangPython,
    LangRuby,
    LangXml,
}

Limit_Behavior :: enum {
    DiscardOldOnes,
    MoveLastOne,
    PreventAdding,
}


Limit_Scope :: enum {
    PerLayer,
    PerLevel,
    PerWorld,
}

Render_Mode :: enum {
    Cross,
    Ellipse,
    Rectangle,
    Tile,
}

Tile_Render_Mode :: enum {
    Cover,
    FitInside,
    FullSizeCropped,
    FullSizeUncropped,
    NineSlice,
    Repeat,
    Stretch,
}

Checker :: enum {
    Horizontal,
    None,
    Vertical,
}

Tile_Mode :: enum {
    Single,
    Stamp,
}

Embed_Atlas :: enum {
    LdtkIcons,
}

// An array containing various advanced flags (ie. options or other states). Possible
// values: `DiscardPreCsvIntGrid`, `ExportOldTableOfContentData`,
// `ExportPreCsvIntGridFormat`, `IgnoreBackupSuggest`, `PrependIndexToLevelFileNames`,
// `MultiWorlds`, `UseMultilinesType`
Flag :: enum {
    DiscardPreCsvIntGrid,
    ExportOldTableOfContentData,
    ExportPreCsvIntGridFormat,
    IgnoreBackupSuggest,
    MultiWorlds,
    PrependIndexToLevelFileNames,
    UseMultilinesType,
}

Bg_Pos :: enum {
    Contain,
    Cover,
    CoverDirty,
    Repeat,
    Unscaled,
}

World_Layout :: enum {
    Free,
    GridVania,
    LinearHorizontal,
    LinearVertical,
}

// Naming convention for Identifiers (first-letter uppercase, full uppercase etc.) Possible
// values: `Capitalize`, `Uppercase`, `Lowercase`, `Free`
Identifier_Style :: enum {
    Capitalize,
    Free,
    Lowercase,
    Uppercase,
}

// "Image export" option when saving project. Possible values: `None`, `OneImagePerLayer`,
// `OneImagePerLevel`, `LayersAndLevels`
Image_Export_Mode :: enum {
    LayersAndLevels,
    None,
    OneImagePerLayer,
    OneImagePerLevel,
}

// Type of the layer as Haxe Enum Possible values: `IntGrid`, `Entities`, `Tiles`,
// `AutoLayer`
Type :: enum {
    AutoLayer,
    Entities,
    IntGrid,
    Tiles,
}

// **IMPORTANT**: this type is available as a preview. You can rely on it to update your
// importers, for when it will be officially available.  A World contains multiple levels,
// and it has its own layout settings.
World :: struct {
    // Default new level height
    default_level_height: int `json:"defaultLevelHeight"`,
    // Default new level width
    default_level_width:  int `json:"defaultLevelWidth"`,
    // User defined unique identifier
    identifier:           string `json:"identifier"`,
    // Unique instance identifer
    iid:                  string `json:"iid"`,
    // All levels from this world. The order of this array is only relevant in
    // `LinearHorizontal` and `linearVertical` world layouts (see `worldLayout` value).
    // Otherwise, you should refer to the `worldX`,`worldY` coordinates of each Level.
    levels:               []Level `json:"levels"`,
    // Height of the world grid in pixels.
    world_grid_height:    int `json:"worldGridHeight"`,
    // Width of the world grid in pixels.
    world_grid_width:     int `json:"worldGridWidth"`,
    // An enum that describes how levels are organized in this project (ie. linearly or in a 2D
    // space). Possible values: `Free`, `GridVania`, `LinearHorizontal`, `LinearVertical`, `nil`
    world_layout:         Maybe(World_Layout) `json:"worldLayout"`,
}