Limit max line size of generated JS code

classlib/src/main/java/org/teavm/classlib/java/lang/ClassLoaderNativeGenerator.java

@@ -74,9 +74,9 @@ public class ClassLoaderNativeGenerator implements Injector {
                 for (int i = 0; i < dataBytes.length; ++i) {
                     dataChars[i] = (char) dataBytes[i];
                 }
-                writer.append("\"").append(RenderingUtil.escapeString(resource)).append("\"");
+                RenderingUtil.writeString(writer, resource);
                 writer.ws().append(':').ws();
-                writer.append("\"").append(new String(dataChars)).append("\"");
+                RenderingUtil.writeString(writer, new String(dataChars));
             }
         }
 

core/src/main/java/org/teavm/backend/javascript/rendering/Renderer.java

@@ -183,7 +183,7 @@ public class Renderer implements RenderingManager {
                 if (i > 0) {
                     writer.append(',').ws();
                 }
-                writer.append('"').append(RenderingUtil.escapeString(context.getStringPool().get(i))).append('"');
+                RenderingUtil.writeString(writer, context.getStringPool().get(i));
             }
             writer.append("]);").newLine();
             stringPoolSize = writer.getOffset() - start;

core/src/main/java/org/teavm/backend/javascript/rendering/RenderingUtil.java

@@ -15,12 +15,14 @@
  */
 package org.teavm.backend.javascript.rendering;
 
+import java.io.IOException;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.HashSet;
 import java.util.Set;
 import org.teavm.ast.ConstantExpr;
 import org.teavm.ast.Expr;
+import org.teavm.backend.javascript.codegen.SourceWriter;
 
 public final class RenderingUtil {
     public static final Set<String> KEYWORDS = Collections.unmodifiableSet(new HashSet<>(Arrays.asList("break", "case",
@@ -43,6 +45,59 @@ public final class RenderingUtil {
         return sb.toString();
     }
 
+    public static void writeString(SourceWriter writer, String s) throws IOException {
+        if (s.isEmpty()) {
+            writer.append("\"\"");
+            return;
+        }
+        for (int i = 0; i < s.length(); i += 512) {
+            int next = Math.min(i + 512, s.length());
+            if (i > 0) {
+                writer.newLine().append("+").ws();
+            }
+            writer.append('"');
+            for (int j = i; j < next; ++j) {
+                char c = s.charAt(j);
+                switch (c) {
+                    case '\r':
+                        writer.append("\\r");
+                        break;
+                    case '\n':
+                        writer.append("\\n");
+                        break;
+                    case '\t':
+                        writer.append("\\t");
+                        break;
+                    case '\'':
+                        writer.append("\\'");
+                        break;
+                    case '\"':
+                        writer.append("\\\"");
+                        break;
+                    case '\\':
+                        writer.append("\\\\");
+                        break;
+                    default:
+                        if (c < ' ') {
+                            writer.append("\\u00").append(Character.forDigit(c / 16, 16))
+                                    .append(Character.forDigit(c % 16, 16));
+                        } else if (Character.isLowSurrogate(c) || Character.isHighSurrogate(c)
+                                || !Character.isDefined(c)) {
+                            writer.append("\\u")
+                                    .append(Character.forDigit(c / 0x1000, 0x10))
+                                    .append(Character.forDigit((c / 0x100) % 0x10, 0x10))
+                                    .append(Character.forDigit((c / 0x10) % 0x10, 0x10))
+                                    .append(Character.forDigit(c % 0x10, 0x10));
+                        } else {
+                            writer.append(c);
+                        }
+                        break;
+                }
+            }
+            writer.append('"');
+        }
+    }
+
     public static String escapeString(String str) {
         StringBuilder sb = new StringBuilder();
         for (int i = 0; i < str.length(); ++i) {

platform/src/main/java/org/teavm/platform/plugin/BuildTimeResourceMap.java

@@ -19,6 +19,7 @@ import java.io.IOException;
 import java.util.HashMap;
 import java.util.Map;
 import org.teavm.backend.javascript.codegen.SourceWriter;
+import org.teavm.backend.javascript.rendering.RenderingUtil;
 import org.teavm.platform.metadata.Resource;
 import org.teavm.platform.metadata.ResourceMap;
 
@@ -49,8 +50,8 @@ class BuildTimeResourceMap<T extends Resource> implements ResourceMap<T>, Resour
                 writer.append(",").ws();
             }
             first = false;
-            ResourceWriterHelper.writeString(writer, entry.getKey());
+            RenderingUtil.writeString(writer, entry.getKey());
-            writer.ws().append(':').ws();
+            writer.append(':').ws();
             ResourceWriterHelper.write(writer, entry.getValue());
         }
         writer.append('}').tokenBoundary();
@@ -58,6 +59,6 @@ class BuildTimeResourceMap<T extends Resource> implements ResourceMap<T>, Resour
 
     @Override
     public String[] keys() {
-        return data.keySet().toArray(new String[data.size()]);
+        return data.keySet().toArray(new String[0]);
     }
 }

platform/src/main/java/org/teavm/platform/plugin/ResourceWriterHelper.java

@@ -17,6 +17,7 @@ package org.teavm.platform.plugin;
 
 import java.io.IOException;
 import org.teavm.backend.javascript.codegen.SourceWriter;
+import org.teavm.backend.javascript.rendering.RenderingUtil;
 
 final class ResourceWriterHelper {
     private ResourceWriterHelper() {
@@ -33,7 +34,7 @@ final class ResourceWriterHelper {
             } else if (resource instanceof Boolean) {
                 writer.append(resource == Boolean.TRUE ? "true" : "false");
             } else if (resource instanceof String) {
-                writeString(writer, (String) resource);
+                RenderingUtil.writeString(writer, (String) resource);
             } else {
                 throw new RuntimeException("Error compiling resources. Value of illegal type found: "
                         + resource.getClass());
@@ -43,12 +44,12 @@ final class ResourceWriterHelper {
 
     public static void writeIdentifier(SourceWriter writer, String id) throws IOException {
         if (id.isEmpty() || !isIdentifierStart(id.charAt(0))) {
-            writeString(writer, id);
+            RenderingUtil.writeString(writer, id);
             return;
         }
         for (int i = 1; i < id.length(); ++i) {
             if (isIdentifierPart(id.charAt(i))) {
-                writeString(writer, id);
+                RenderingUtil.writeString(writer, id);
                 return;
             }
         }
@@ -68,34 +69,4 @@ final class ResourceWriterHelper {
         }
         return c >= '0' && c <= '9';
     }
-
-    public static void writeString(SourceWriter writer, String s) throws IOException {
-        writer.append('"');
-        for (int i = 0; i < s.length(); ++i) {
-            char c = s.charAt(i);
-            switch (c) {
-                case '\0':
-                    writer.append("\\0");
-                    break;
-                case '\n':
-                    writer.append("\\n");
-                    break;
-                case '\r':
-                    writer.append("\\r");
-                    break;
-                case '\t':
-                    writer.append("\\t");
-                    break;
-                default:
-                    if (c < 32) {
-                        writer.append("\\u00").append(Character.forDigit(c / 16, 16))
-                                .append(Character.forDigit(c % 16, 16));
-                    } else {
-                        writer.append(c);
-                    }
-                    break;
-            }
-        }
-        writer.append('"');
-    }
 }