mapserver: support for text-min-path-length (numeric and auto)

builder/mapserver/mapfile.go

@@ -487,6 +487,16 @@ func (m *Map) addTextSymbolizer(b *Block, r mss.Rule, isLine bool) (styled bool)
 			style.AddNonNil("Font", fontNames)
 		}
 
+		var minFeatureSizeSet bool
+		if _, ok := r.Properties.GetString("text-min-path-length"); ok {
+			minFeatureSizeSet = true
+			style.Add("MinFeatureSize", "AUTO")
+		}
+		if minLength, ok := r.Properties.GetFloat("text-min-path-length"); ok {
+			minFeatureSizeSet = true
+			style.Add("MinFeatureSize", minLength)
+		}
+
 		style.Add("Type", "truetype")
 		if isLine {
 			angle, ok := r.Properties.GetString("text-placement")
@@ -497,7 +507,9 @@ func (m *Map) addTextSymbolizer(b *Block, r mss.Rule, isLine bool) (styled bool)
 				style.Add("Angle", "FOLLOW")
 			}
 
-			style.Add("MinFeatureSize", "AUTO")
+			if !minFeatureSizeSet {
+				style.Add("MinFeatureSize", "AUTO")
+			}
 		}
 		if wrapWidth, ok := r.Properties.GetFloat("text-wrap-width"); ok {
 			maxLength := wrapWidth / textSize

mss/spec.go

@@ -83,6 +83,15 @@ func isKeyword(keywords ...string) isValid {
 	}
 }
 
+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 {
@@ -376,7 +385,7 @@ func init() {
 		"text-justify-alignment":        isJustifyAlignment,
 		"text-margin":                   isNumber,
 		"text-repeat-distance":          isNumber,
-		"text-min-path-length":          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,