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|
function generateProperties(spec) {
const layouts = spec.layout;
const paints = spec.paint;
var codes = {};
var docs = {};
var enums = {};
layouts.forEach(l => {
const layerType = titleCase(l.split("_")[1]);
docs[layerType] = [];
codes[layerType] = [];
Object.entries(spec[l]).forEach(([name, prop]) => {
if (name == "visibility") return "";
if (prop.type === "enum") {
enums[name] = Object.keys(prop.values).join(" | ");
}
codes[layerType].push(
generateElmProperty(name, prop, layerType, "Layout")
);
docs[layerType].push(camelCase(name));
});
});
paints.forEach(l => {
const layerType = titleCase(l.split("_")[1]);
Object.entries(spec[l]).forEach(([name, prop]) => {
if (name == "visibility") return "";
if (prop.type === "enum") {
enums[name] = Object.keys(prop.values).join(" | ");
}
codes[layerType].push(
generateElmProperty(name, prop, layerType, "Paint")
);
docs[layerType].push(camelCase(name));
});
});
Object.values(docs).forEach(d => d.sort());
Object.values(codes).forEach(d => d.sort());
return `
module Mapbox.Layer exposing (
Layer, SourceId, Background, Fill, Symbol, Line, Raster, Circle, FillExtrusion, Heatmap, Hillshade, LayerAttr,
encode,
background, fill, symbol, line, raster, circle, fillExtrusion, heatmap, hillshade,
metadata, sourceLayer, minzoom, maxzoom, filter, visible,
${Object.values(docs)
.map(d => d.join(", "))
.join(",\n ")})
{-|
Layers specify what is actually rendered on the map and are rendered in order.
Except for layers of the background type, each layer needs to refer to a source. Layers take the data that they get from a source, optionally filter features, and then define how those features are styled.
There are two kinds of properties: *Layout* and *Paint* properties.
Layout properties are applied early in the rendering process and define how data for that layer is passed to the GPU. Changes to a layout property require an asynchronous "layout" step.
Paint properties are applied later in the rendering process. Changes to a paint property are cheap and happen synchronously.
### Working with layers
@docs Layer, SourceId, encode
### Layer Types
@docs background, fill, symbol, line, raster, circle, fillExtrusion, heatmap, hillshade
@docs Background, Fill, Symbol, Line, Raster, Circle, FillExtrusion, Heatmap, Hillshade
### General Attributes
@docs LayerAttr
@docs metadata, sourceLayer, minzoom, maxzoom, filter, visible
${Object.entries(docs)
.map(
([section, docs]) =>
`### ${section} Attributes\n\n@docs ${docs.join(", ")}`
)
.join("\n\n")}
-}
import Array exposing (Array)
import Json.Encode as Encode exposing (Value)
import Mapbox.Expression as Expression exposing (Anchor, Auto, CameraExpression, Color, DataExpression, Expression, LineCap, LineJoin, Position, RasterResampling, SymbolPlacement, TextFit, TextJustify, TextTransform, FormattedText)
{-| Represents a layer. -}
type Layer
= Layer Value
{-| All layers (except background layers) need a source -}
type alias SourceId = String
{-| -}
type Background
= BackgroundLayer
{-| -}
type Fill
= FillLayer
{-| -}
type Symbol
= SymbolLayer
{-| -}
type Line
= LineLayer
{-| -}
type Raster
= RasterLayer
{-| -}
type Circle
= CircleLayer
{-| -}
type FillExtrusion
= FillExtrusionLayer
{-| -}
type Heatmap
= HeatmapLayer
{-| -}
type Hillshade
= HillshadeLayer
{-| Turns a layer into JSON -}
encode : Layer -> Value
encode (Layer value) =
value
layerImpl tipe id source attrs =
[ ( "type", Encode.string tipe )
, ( "id", Encode.string id )
, ( "source", Encode.string source)
]
++ encodeAttrs attrs
|> Encode.object
|> Layer
encodeAttrs attrs =
let
{ top, layout, paint } =
List.foldl
(\\attr lists ->
case attr of
Top key val ->
{ lists | top = ( key, val ) :: lists.top }
Paint key val ->
{ lists | paint = ( key, val ) :: lists.paint }
Layout key val ->
{ lists | layout = ( key, val ) :: lists.layout }
)
{ top = [], layout = [], paint = [] }
attrs
in
( "layout", Encode.object layout ) :: ( "paint", Encode.object paint ) :: top
{-| The background color or pattern of the map. -}
background : String -> List (LayerAttr Background) -> Layer
background id attrs =
[ ( "type", Encode.string "background" )
, ( "id", Encode.string id )
]
++ encodeAttrs attrs
|> Encode.object
|> Layer
{-| A filled polygon with an optional stroked border. -}
fill : String -> SourceId -> List (LayerAttr Fill) -> Layer
fill =
layerImpl "fill"
{-| A stroked line. -}
line : String -> SourceId -> List (LayerAttr Line) -> Layer
line =
layerImpl "line"
{-| An icon or a text label. -}
symbol : String -> SourceId -> List (LayerAttr Symbol) -> Layer
symbol =
layerImpl "symbol"
{-| Raster map textures such as satellite imagery. -}
raster : String -> SourceId -> List (LayerAttr Raster) -> Layer
raster =
layerImpl "raster"
{-| A filled circle. -}
circle : String -> SourceId -> List (LayerAttr Circle) -> Layer
circle =
layerImpl "circle"
{-| An extruded (3D) polygon. -}
fillExtrusion : String -> SourceId -> List (LayerAttr FillExtrusion) -> Layer
fillExtrusion =
layerImpl "fill-extrusion"
{-| A heatmap. -}
heatmap : String -> SourceId -> List (LayerAttr Heatmap) -> Layer
heatmap =
layerImpl "heatmap"
{-| Client-side hillshading visualization based on DEM data. Currently, the implementation only supports Mapbox Terrain RGB and Mapzen Terrarium tiles. -}
hillshade : String -> SourceId -> List (LayerAttr Hillshade) -> Layer
hillshade =
layerImpl "hillshade"
{-| -}
type LayerAttr tipe
= Top String Value
| Paint String Value
| Layout String Value
-- General Attributes
{-| Arbitrary properties useful to track with the layer, but do not influence rendering. Properties should be prefixed to avoid collisions, like 'mapbox:'. -}
metadata : Value -> LayerAttr all
metadata =
Top "metadata"
{-| Layer to use from a vector tile source. Required for vector tile sources; prohibited for all other source types, including GeoJSON sources. -}
sourceLayer : String -> LayerAttr all
sourceLayer =
Encode.string >> Top "source-layer"
{-| The minimum zoom level for the layer. At zoom levels less than the minzoom, the layer will be hidden. A number between 0 and 24 inclusive. -}
minzoom : Float -> LayerAttr all
minzoom =
Encode.float >> Top "minzoom"
{-| The maximum zoom level for the layer. At zoom levels equal to or greater than the maxzoom, the layer will be hidden. A number between 0 and 24 inclusive. -}
maxzoom : Float -> LayerAttr all
maxzoom =
Encode.float >> Top "maxzoom"
{-| A expression specifying conditions on source features. Only features that match the filter are displayed. -}
filter : Expression any Bool -> LayerAttr all
filter =
Expression.encode >> Top "filter"
{-| Whether this layer is displayed. -}
visible : Expression CameraExpression Bool -> LayerAttr any
visible vis =
Layout "visibility" <| Expression.encode <| Expression.ifElse vis (Expression.str "visible") (Expression.str "none")
${Object.entries(codes)
.map(([section, codes]) => `-- ${section}\n\n${codes.join("\n")}`)
.join("\n\n")}
`;
}
function codeSnippet(name, type) {
return "`" + camelCase(name, type) + "`";
}
function requires(req) {
if (typeof req === "string") {
return `Requires ${codeSnippet(req)}.`;
} else if (req["!"]) {
return `Disabled by ${codeSnippet(req["!"])}.`;
} else if (req["<="]) {
return `Must be less than or equal to \`${camelCase(req["<="])}\`.`;
} else {
const [name, value] = Object.entries(req)[0];
if (Array.isArray(value)) {
return `Requires ${codeSnippet(name)} to be ${value.slice(1).reduce(
(prev, curr) => prev + ", or " + codeSnippet(curr), codeSnippet(value[0])
)}.`;
} else {
return `Requires ${codeSnippet(name)} to be \`${value}\`.`;
}
}
}
function generateElmProperty(name, prop, layerType, position) {
if (name == "visibility") return "";
if (prop["property-type"] === "constant")
throw "Constant property type not supported";
const elmName = camelCase(name);
const exprKind =
prop["sdk-support"]["data-driven styling"] &&
prop["sdk-support"]["data-driven styling"].js
? "any"
: "CameraExpression";
const exprType = getElmType(prop);
let bounds = "";
if ("minimum" in prop && "maximum" in prop) {
bounds = `\n\nShould be between \`${prop.minimum}\` and \`${
prop.maximum
}\` inclusive. `;
} else if ("minimum" in prop) {
bounds = `\n\nShould be greater than or equal to \`${prop.minimum}\`. `;
} else if ("maximum" in prop) {
bounds = `\n\nShould be less than or equal to \`${prop.maximum}\`. `;
}
let valueHelp = "";
if (exprType == "(Anchor Never)" || exprType == "(Anchor Auto)") {
valueHelp = Object.entries(prop.values)
.map(
([value, { doc }]) =>
`\n- ${codeSnippet(value, exprType)}: ${docify(doc)}`
)
.join("");
}
return `
{-| ${docify(prop.doc, elmName)} ${position} property. ${bounds}${
prop.units ? `\nUnits in ${prop.units}. ` : ""
}${prop.default !== undefined && elmName !== 'heatmapColor' && elmName !== 'textFont' ? "Defaults to `" + camelCase(prop.default.toString(), exprType) + "`. " : ""}${
prop.requires ? prop.requires.map(requires).join(" ") : ""
}${valueHelp}
-}
${elmName} : Expression ${exprKind} ${exprType} -> LayerAttr ${layerType}
${elmName} =
Expression.encode >> ${position} "${name}"`;
}
const enumMap = {
"map | viewport | auto": "(Anchor Auto)",
"map | viewport": "(Anchor Never)",
"left | center | right": "TextJustify",
"center | left | right | top | bottom | top-left | top-right | bottom-left | bottom-right":
"Position",
"none | width | height | both": "TextFit",
"butt | round | square": "LineCap",
"bevel | round | miter": "LineJoin",
"point | line | line-center": "SymbolPlacement",
"none | uppercase | lowercase": "TextTransform",
"linear | nearest": "RasterResampling"
};
const flatEnumMap = Object.assign(Object.entries(enumMap).reduce((res, [values, tipe]) => values.split(' | ').reduce((obj, value) => Object.assign({}, obj, {[value]: tipe}), res), {}), {
map: 'Anchor',
viewport: 'Anchor',
auto: "Anchor"
});
const reverseEnumMap = Object.entries(enumMap).reduce((res, [values, tipe]) => tipe ==="(Anchor Auto)" || tipe === "(Anchor Never)" ? res : Object.assign({}, res, {[tipe]: values.split(' | ')}), {})
console.error(reverseEnumMap)
function docify(str, name) {
switch (name) {
case "lineGradient":
case "lineDasharray":
return str;
case "heatmapColor":
return `Defines the color of each pixel based on its density value in a heatmap. The value should be an Expression that uses \`heatmapDensity\` as input. Defaults to:
E.heatmapDensity
|> E.interpolate E.Linear
[ (0.0, rgba 0 0 255 0)
, (0.1, rgba 65 105 225 1)
, (0.3, rgba 0 255 255 1)
, (0.5, rgba 0 255 0 1)
, (0.7, rgba 255 255 0 1)
, (1.0, rgba 255 0 0 1)]`
case "textField":
return `Value to use for a text label.`;
}
///`(\w+\-.+?)`/g
return str.replace(
/`(.+?)`/g,
(str, match) => "`" + camelCase(match) + "`"
)
}
function getElmType({ type, value, values }) {
switch (type) {
case "number":
return "Float";
case "boolean":
return "Bool";
case "string":
return "String";
case "color":
return "Color";
case "array":
switch (value) {
case "number":
return "(Array Float)";
case "string":
return "(Array String)";
}
case "formatted":
return "FormattedText";
case "enum":
const res = enumMap[Object.keys(values).join(" | ")];
if (res) return res;
}
throw `Unknown type ${type}, ${value}, ${values && Object.keys(values)}`;
}
function titleCase(str) {
return str
.replace(/\-/, " ")
.replace(/\w\S*/g, function(txt) {
return txt.charAt(0).toUpperCase() + txt.substr(1).toLowerCase();
})
.replace(/\s/, "");
}
function camelCase(str, type) {
if (type && reverseEnumMap[type]) {
str = type + ' ' + str;
} else if (flatEnumMap[str]) {
str = flatEnumMap[str] + ' ' + str;
} else if (str === "rgba(0, 0, 0, 0)") {
return "rgba 0 0 0 0"
}
return str
.replace(/(?:^\w|[A-Z]|\b\w|\-\w)/g, function(letter, index) {
return index == 0 ? letter.toLowerCase() : letter.toUpperCase();
})
.replace(/(?:\s|\-)+/g, "");
}
function makeSignatures(name, constants) {
return `{-| -}
type ${name} = ${name}
${constants
.split(" | ")
.map(
c => `
{-| -}
${camelCase(name + " " + c)} : Expression exprType ${name}
${camelCase(name + " " + c)} = Expression (Json.Encode.string "${c}")
`
)
.join("\n")}`;
}
/// --- NODEJS STUFF
var stdin = process.stdin,
stdout = process.stdout,
inputChunks = [];
stdin.resume();
stdin.setEncoding("utf8");
stdin.on("data", function(chunk) {
inputChunks.push(chunk);
});
stdin.on("end", function() {
var inputJSON = inputChunks.join(""),
parsedData = JSON.parse(inputJSON),
output = generateProperties(parsedData);
stdout.write(output);
stdout.write("\n");
});
|