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magnacarto/mss/spec.go

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package mss
import "github.com/omniscale/magnacarto/color"
var attributeTypes map[string]isValid
type isValid func(interface{}) bool
func isNumber(val interface{}) bool {
_, ok := val.(float64)
return ok
}
func isNumbers(val interface{}) bool {
vals, ok := val.([]Value)
if !ok {
return false
}
for _, v := range vals {
if !isNumber(v) {
return false
}
}
return true
}
func isString(val interface{}) bool {
_, ok := val.(string)
return ok
}
func isStrings(val interface{}) bool {
vals, ok := val.([]Value)
if !ok {
return false
}
for _, v := range vals {
if !isString(v) {
return false
}
}
return true
}
func isStringOrStrings(val interface{}) bool {
return isString(val) || isStrings(val)
}
func isFieldOr(other isValid) isValid {
return func(val interface{}) bool {
if s, ok := val.(string); ok {
if len(s) > 2 && s[0] == '[' && s[len(s)-1] == ']' {
return true
}
return false
}
return other(val)
}
}
func isColor(val interface{}) bool {
_, ok := val.(color.Color)
return ok
}
func isBool(val interface{}) bool {
_, ok := val.(bool)
return ok
}
func isKeyword(keywords ...string) isValid {
return func(val interface{}) bool {
k, ok := val.(string)
if !ok {
return false
}
for _, expected := range keywords {
if k == expected {
return true
}
}
return false
}
}
func isKeywordOr(other isValid, keywords ...string) isValid {
return func(val interface{}) bool {
if other(val) {
return true
}
return isKeyword(keywords...)(val)
}
}
func isStops(val interface{}) bool {
vals, ok := val.([]Value)
if !ok {
return false
}
for _, v := range vals {
if _, ok := v.(Stop); !ok {
return false
}
}
return true
}
func isCompOp(val interface{}) bool {
return isKeyword(
"clear",
"src",
"dst",
"src-over",
"dst-over",
"src-in",
"dst-in",
"src-out",
"dst-out",
"src-atop",
"dst-atop",
"xor",
"plus",
"minus",
"multiply",
"divide",
"screen",
"overlay",
"darken",
"lighten",
"color-dodge",
"color-burn",
"hard-light",
"soft-light",
"difference",
"exclusion",
"contrast",
"invert",
"invert-rgb",
"grain-merge",
"grain-extract",
"hue",
"saturation",
"color",
"value",
)(val)
}
func isScaling(val interface{}) bool {
return isKeyword(
"near",
"fast",
"bilinear",
"bicubic",
"spline16",
"spline36",
"hanning",
"hamming",
"hermite",
"kaiser",
"quadric",
"catrom",
"gaussian",
"bessel",
"mitchell",
"sinc",
"lanczos",
"blackman",
)(val)
}
func isSimplifyAlgorithm(val interface{}) bool {
return isKeyword(
"radial-distance",
"zhao-saalfeld",
"visvalingam-whyatt",
)(val)
}
func isRasterizer(val interface{}) bool {
return isKeyword(
"full",
"fast",
)(val)
}
func isVerticalAlignment(val interface{}) bool {
return isKeyword(
"top",
"middle",
"bottom",
"auto",
)(val)
}
func isJustifyAlignment(val interface{}) bool {
return isKeyword(
"left",
"center",
"right",
"auto",
)(val)
}
func init() {
attributeTypes = map[string]isValid{
"background-color": isColor,
"building-fill": isColor,
"building-fill-opacity": isNumber,
"building-height": isNumber,
"dot-fill": isColor,
"dot-opacity": isNumber,
"dot-width": isNumber,
"dot-height": isNumber,
"dot-comp-op": isCompOp,
"line-cap": isKeyword("round", "butt", "square"),
"line-clip": isBool,
"line-color": isColor,
"line-dasharray": isNumbers,
"line-dash-offset": isNumbers,
"line-gamma": isNumber,
"line-gamma-method": isKeyword("power", "linear", "none", "threshold", "multiply"),
"line-join": isKeyword("miter", "miter-revert", "round", "bevel"),
"line-miterlimit": isNumber,
"line-offset": isNumber,
"line-opacity": isNumber,
"line-rasterizer": isRasterizer,
"line-simplify": isNumber,
"line-simplify-algorithm": isSimplifyAlgorithm,
"line-smooth": isNumber,
"line-width": isNumber,
"line-comp-op": isCompOp,
"line-geometry-transform": isString,
"line-pattern-file": isString,
"line-pattern-clip": isBool,
"line-pattern-opacity": isNumber,
"line-pattern-simplify": isNumber,
"line-pattern-simplify-algorithm": isSimplifyAlgorithm,
"line-pattern-smooth": isNumber,
"line-pattern-offset": isNumber,
"line-pattern-geometry-transform": isString,
"line-pattern-comp-op": isCompOp,
"marker-allow-overlap": isBool,
"marker-file": isString,
"marker-fill": isColor,
"marker-fill-opacity": isNumber,
"marker-height": isNumber,
"marker-line-color": isColor,
"marker-line-width": isNumber,
"marker-line-opacity": isNumber,
"marker-opacity": isNumber,
"marker-placement": isKeyword("point", "interior", "line", "vertex-first", "vertex-last"),
"marker-spacing": isNumber,
"marker-transform": isString,
"marker-type": isKeyword("arrow", "ellipse"),
"marker-width": isNumber,
"marker-multi-policy": isKeyword("each", "whole", "largest"),
"marker-avoid-edges": isBool,
"marker-ignore-placement": isBool,
"marker-max-error": isNumber,
"marker-clip": isBool,
"marker-simplify": isNumber,
"marker-simplify-algorithm": isSimplifyAlgorithm,
"marker-smooth": isNumber,
"marker-geometry-transform": isString,
"marker-offset": isNumber,
"marker-comp-op": isCompOp,
"marker-direction": isKeyword("auto", "auto-down", "left", "right", "left-only", "right-only", "up", "down"),
"point-file": isString,
"point-allow-overlap": isBool,
"point-opacity": isNumber,
"point-transform": isString,
"point-ignore-placement": isBool,
"point-placement": isKeyword("centroid", "interior"),
"point-comp-op": isCompOp,
"polygon-fill": isColor,
"polygon-gamma": isNumber,
"polygon-gamma-method": isKeyword("power", "linear", "none", "threshold", "multiply"),
"polygon-opacity": isNumber,
"polygon-clip": isBool,
"polygon-simplify": isNumber,
"polygon-simplify-algorithm": isSimplifyAlgorithm,
"polygon-smooth": isNumber,
"polygon-geometry-transform": isString,
"polygon-comp-op": isCompOp,
"polygon-pattern-alignment": isKeyword("global", "local"),
"polygon-pattern-file": isString,
"polygon-pattern-gamma": isNumber,
"polygon-pattern-opacity": isNumber,
"polygon-pattern-clip": isBool,
"polygon-pattern-simplify": isNumber,
"polygon-pattern-simplify-algorithm": isSimplifyAlgorithm,
"polygon-pattern-smooth": isNumber,
"polygon-pattern-geometry-transform": isString,
"polygon-pattern-comp-op": isCompOp,
"shield-allow-overlap": isBool,
"shield-avoid-edges": isBool,
"shield-character-spacing": isNumber,
"shield-clip": isBool,
"shield-dx": isNumber,
"shield-dy": isNumber,
"shield-face-name": isStringOrStrings,
"shield-file": isString,
"shield-fill": isColor,
"shield-halo-fill": isColor,
"shield-halo-radius": isNumber,
"shield-halo-rasterizer": isRasterizer,
"shield-halo-transform": isString,
"shield-halo-comp-op": isCompOp,
"shield-halo-opacity": isNumber,
"shield-line-spacing": isNumber,
"shield-min-distance": isNumber,
"shield-min-padding": isNumber,
"shield-name": isString,
"shield-opacity": isNumber,
"shield-placement": isKeyword("line", "point", "vertex", "interior"),
"shield-placement-type": isKeyword("dummy", "simple", "list"),
"shield-placements": isString,
"shield-transform": isString,
"shield-simplify": isNumber,
"shield-simplify-algorithm": isSimplifyAlgorithm,
"shield-smooth": isNumber,
"shield-comp-op": isCompOp,
"shield-size": isNumber,
"shield-spacing": isNumber,
"shield-text-dx": isNumber,
"shield-text-dy": isNumber,
"shield-text-opacity": isNumber,
"shield-text-transform": isKeyword("none", "uppercase", "lowercase", "capitalize", "reverse"),
"shield-wrap-before": isBool,
"shield-wrap-character": isString,
"shield-wrap-width": isNumber,
"shield-unlock-image": isBool,
"shield-margin": isNumber,
"shield-repeat-distance": isNumber,
"shield-label-position-tolerance": isNumber,
"shield-horizontal-alignment": isKeyword("left", "middle", "right", "auto"),
"shield-vertical-alignment": isVerticalAlignment,
"shield-justify-alignment": isJustifyAlignment,
"text-allow-overlap": isBool,
"text-avoid-edges": isBool,
"text-character-spacing": isNumber,
"text-clip": isBool,
"text-dx": isNumber,
"text-dy": isNumber,
"text-face-name": isStringOrStrings,
"text-font-feature-settings": isString,
"text-fill": isColor,
"text-halo-fill": isColor,
"text-halo-radius": isNumber,
"text-halo-opacity": isNumber,
"text-halo-rasterizer": isRasterizer,
"text-halo-transform": isString,
"text-halo-comp-op": isCompOp,
"text-line-spacing": isNumber,
"text-min-distance": isNumber,
"text-min-padding": isNumber,
"text-name": isString,
"text-opacity": isNumber,
"text-orientation": isFieldOr(isNumber),
"text-placement": isKeyword("line", "point", "vertex", "interior"),
"text-placement-type": isKeyword("dummy", "simple", "list"),
"text-placements": isString,
"text-size": isNumber,
"text-spacing": isNumber,
"text-transform": isKeyword("none", "uppercase", "lowercase", "capitalize", "reverse"),
"text-wrap-before": isBool,
"text-wrap-character": isString,
"text-wrap-width": isNumber,
"text-repeat-wrap-characater": isBool,
"text-ratio": isNumber,
"text-label-position-tolerance": isNumber,
"text-max-char-angle-delta": isNumber,
"text-vertical-alignment": isVerticalAlignment,
"text-horizontal-alignment": isKeyword("left", "middle", "right", "auto", "adjust"),
"text-justify-alignment": isJustifyAlignment,
"text-margin": isNumber,
"text-repeat-distance": isNumber,
"text-min-path-length": isKeywordOr(isNumber, "auto"),
"text-rotate-displacement": isBool,
"text-upgright": isKeyword("auto", "auto-down", "left", "right", "left-only", "right-only"),
"text-simplify": isNumber,
"text-simplify-algorithm": isSimplifyAlgorithm,
"text-smooth": isNumber,
"text-comp-op": isCompOp,
"text-largest-bbox-only": isBool,
"raster-opacity": isNumber,
"raster-scaling": isScaling,
"raster-colorizer-default-mode": isKeyword("discrete", "linear", "exact"),
"raster-colorizer-default-color": isColor,
"raster-colorizer-stops": isStops,
"raster-comp-op": isCompOp,
"raster-filter-factor": isNumber,
"raster-mesh-size": isNumber,
"raster-colorizer-epsilon": isNumber,
}
}
// validProperty returns whether the property and the value is valid.
func validProperty(property string, value interface{}) (bool, bool) {
checkFunc, ok := attributeTypes[property]
if !ok {
return false, false
}
return true, checkFunc(value)
}
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