1 files changed, 11 insertions, 89 deletions
diff --git a/src/mbgl/util/merge_lines.hpp b/src/mbgl/util/merge_lines.hpp
index e0dd4c6415..4460a0bcea 100644
--- a/src/mbgl/util/merge_lines.hpp
+++ b/src/mbgl/util/merge_lines.hpp
@@ -4,102 +4,24 @@
 #include <map>
 #include <string>
 #include <vector>
-#include <sstream>
 #include <mbgl/renderer/symbol_bucket.hpp>
 
-
 namespace mbgl {
 namespace util {
 
-unsigned int mergeFromRight(
-        std::vector<SymbolFeature> &features,
-        std::map<std::string,unsigned int> &rightIndex,
-        std::map<std::string,unsigned int>::iterator left,
-        std::string &rightKey,
-        std::vector<std::vector<Coordinate>> &geom) {
-
-    unsigned int index = left->second;
-    rightIndex.erase(left);
-    rightIndex[rightKey] = index;
-    features[index].geometry[0].pop_back();
-    features[index].geometry[0].insert(features[index].geometry[0].end(), geom[0].begin(), geom[0].end());
-    geom[0].clear();
-    return index;
-}
-
-unsigned int mergeFromLeft(
-        std::vector<SymbolFeature> &features,
-        std::map<std::string,unsigned int> &leftIndex,
-        std::string &leftKey,
-        std::map<std::string,unsigned int>::iterator right,
-        std::vector<std::vector<Coordinate>> &geom) {
-
-    unsigned int index = right->second;
-    leftIndex.erase(right);
-    leftIndex[leftKey] = index;
-    geom[0].pop_back();
-    geom[0].insert(geom[0].end(), features[index].geometry[0].begin(), features[index].geometry[0].end());
-    features[index].geometry[0].clear();
-    std::swap(features[index].geometry[0], geom[0]);
-    return index;
-}
-
-std::string getKey(const std::u32string &text, const std::vector<std::vector<Coordinate>> &geom, bool onRight) {
-    const Coordinate &coord = onRight ? geom[0].back() : geom[0].front();
-    std::ostringstream key;
-    for (const char32_t &c : text) {
-        key << (char)c;
-    }
-    key << ":" << coord.x << ":" << coord.y;
-    return key.str();
-}
-
-
-void mergeLines(std::vector<SymbolFeature> &features) {
-
-    std::map<std::string,unsigned int> leftIndex;
-    std::map<std::string,unsigned int> rightIndex;
-
-    for (unsigned int k = 0; k < features.size(); k++) {
-        SymbolFeature &feature = features[k];
-        std::vector<std::vector<Coordinate>> &geometry = feature.geometry;
-
-        if (!feature.label.length()) {
-            continue;
-        }
-
-        std::string leftKey = getKey(feature.label, geometry, false);
-        std::string rightKey = getKey(feature.label, geometry, true);
-
-        auto left = rightIndex.find(leftKey);
-        auto right = leftIndex.find(rightKey);
-
-        if ((left != rightIndex.end()) && (right != leftIndex.end()) && (left->second != right->second)) {
-            // found lines with the same text adjacent to both ends of the current line, merge all three
-            unsigned int j = mergeFromLeft(features, leftIndex, leftKey, right, geometry);
-            unsigned int i = mergeFromRight(features, rightIndex, left, rightKey, features[j].geometry);
-
-            leftIndex.erase(leftKey);
-            rightIndex.erase(rightKey);
-            rightIndex[getKey(feature.label, features[i].geometry, true)] = i;
-
-        } else if (left != rightIndex.end()) {
-            // found mergeable line adjacent to the start of the current line, merge
-            mergeFromRight(features, rightIndex, left, rightKey, geometry);
-
-        } else if (right != leftIndex.end()) {
-            // found mergeable line adjacent to the end of the current line, merge
-            mergeFromLeft(features, leftIndex, leftKey, right, geometry);
-
-        } else {
-            // no adjacent lines, add as a new item
-            leftIndex[leftKey] = k;
-            rightIndex[rightKey] = k;
-        }
+unsigned int mergeFromRight(std::vector<SymbolFeature> &features,
+                            std::map<std::string, unsigned int> &rightIndex,
+                            std::map<std::string, unsigned int>::iterator left,
+                            std::string &rightKey,
+                            std::vector<std::vector<Coordinate>> &geom);
 
-    }
+unsigned int mergeFromLeft(std::vector<SymbolFeature> &features,
+                           std::map<std::string, unsigned int> &leftIndex,
+                           std::string &leftKey,
+                           std::map<std::string, unsigned int>::iterator right,
+                           std::vector<std::vector<Coordinate>> &geom);
 
-}
+void mergeLines(std::vector<SymbolFeature> &features);
 
 } // end namespace util
 } // end namespace mbgl