Update BST VM to Antlr4

build.gradle

@@ -85,7 +85,6 @@ repositories {
 }
 
 configurations {
-    antlr3
     antlr4
     // TODO: Remove the following workaround for split error messages such as
     // error: module java.xml.bind reads package javax.annotation from both jsr305 and java.annotation
@@ -139,9 +138,6 @@ dependencies {
     implementation 'io.github.java-diff-utils:java-diff-utils:4.11'
     implementation 'info.debatty:java-string-similarity:2.0.0'
 
-    antlr3 'org.antlr:antlr:3.5.3'
-    implementation 'org.antlr:antlr-runtime:3.5.3'
-
     antlr4 'org.antlr:antlr4:4.9.3'
     implementation 'org.antlr:antlr4-runtime:4.9.3'
 
@@ -273,14 +269,14 @@ task generateSource(dependsOn: ["generateBstGrammarSource",
 }
 
 tasks.register("generateBstGrammarSource", JavaExec) {
-    main = "org.antlr.Tool"
-    classpath = configurations.antlr3
+    main = "org.antlr.v4.Tool"
+    classpath = configurations.antlr4
     group = "JabRef"
-    description = 'Generates BstLexer.java and BstParser.java from the Bst.g grammar file using antlr3.'
+    description = 'Generates BstLexer.java and BstParser.java from the Bst.g grammar file using antlr4.'
 
-    inputs.dir('src/main/antlr3/org/jabref/bst/')
+    inputs.dir('src/main/antlr4/org/jabref/bst/')
     outputs.dir("src-gen/main/java/org/jabref/logic/bst/")
-    args = ["-o", "src-gen/main/java/org/jabref/logic/bst/" , "$projectDir/src/main/antlr3/org/jabref/bst/Bst.g" ]
+    args = ["-o", "src-gen/main/java/org/jabref/logic/bst/", "-visitor", "-no-listener", "-package", "org.jabref.logic.bst", "$projectDir/src/main/antlr4/org/jabref/bst/Bst.g4"]
 }
 
 tasks.register("generateSearchGrammarSource", JavaExec) {

src/main/antlr4/org/jabref/bst/Bst.g4

@@ -0,0 +1,85 @@
+grammar Bst;
+
+// Lexer
+
+STRINGS : 'STRINGS';
+INTEGERS : 'INTEGERS';
+FUNCTION : 'FUNCTION';
+EXECUTE : 'EXECUTE';
+SORT : 'SORT';
+ITERATE : 'ITERATE';
+REVERSE : 'REVERSE';
+ENTRY : 'ENTRY';
+READ : 'READ';
+MACRO : 'MACRO';
+
+GT : '>';
+LT : '<';
+EQUAL : '=';
+ASSIGN : ':=';
+ADD : '+';
+SUB : '-';
+CONCAT : '*';
+LBRACE : '{';
+RBRACE : '}';
+
+fragment LETTER : ('a'..'z'|'A'..'Z'|'.'|'$');
+fragment NUMERAL : ('0'..'9');
+
+IDENTIFIER : LETTER (LETTER|NUMERAL|'_')*;
+INTEGER : '#' ('+'|'-')? NUMERAL+;
+QUOTED : '\'' IDENTIFIER;
+STRING : '"' (~('"'))* '"';
+
+WS: [ \r\n\t]+ -> skip;
+LINE_COMMENT : '%' ~('\n'|'\r')* '\r'? '\n' -> skip;
+
+// Parser
+
+bstFile
+    : commands+ EOF
+    ;
+
+commands
+    : STRINGS ids=idListObl                                           #stringsCommand
+    | INTEGERS ids=idListObl                                          #integersCommand
+    | FUNCTION LBRACE id=identifier RBRACE function=stack             #functionCommand
+    | MACRO LBRACE id=identifier RBRACE LBRACE repl=STRING RBRACE     #macroCommand
+    | READ                                                            #readCommand
+    | EXECUTE LBRACE bstFunction RBRACE                               #executeCommand
+    | ITERATE LBRACE bstFunction RBRACE                               #iterateCommand
+    | REVERSE LBRACE bstFunction RBRACE                               #reverseCommand
+    | ENTRY idListOpt idListOpt idListOpt                             #entryCommand
+    | SORT                                                            #sortCommand
+    ;
+
+identifier
+    : IDENTIFIER
+    ;
+
+// Obligatory identifier list
+idListObl
+    : LBRACE identifier+ RBRACE
+    ;
+
+// Optional identifier list
+idListOpt
+    : LBRACE identifier* RBRACE
+    ;
+
+bstFunction
+    : LT | GT | EQUAL | ADD | SUB | ASSIGN | CONCAT
+    | identifier
+    ;
+
+stack
+    : LBRACE stackitem+ RBRACE
+    ;
+
+stackitem
+    : bstFunction
+    | STRING
+    | INTEGER
+    | QUOTED
+    | stack
+    ;

src/main/java/module-info.java

@@ -85,7 +85,6 @@
     requires org.mariadb.jdbc;
     uses org.mariadb.jdbc.credential.CredentialPlugin;
     requires org.apache.commons.lang3;
-    requires antlr.runtime;
     requires org.antlr.antlr4.runtime;
     requires org.fxmisc.flowless;
     requires org.apache.tika.core;