simple first json syntax

Author: wumpz

src/main/java/net/sf/jsqlparser/expression/ExpressionVisitor.java

@@ -143,4 +143,6 @@ public interface ExpressionVisitor {
 	void visit(OracleHierarchicalExpression oexpr);
 
 	void visit(RegExpMatchOperator rexpr);
+    
+    void visit(JsonExpression jsonExpr);
 }

src/main/java/net/sf/jsqlparser/expression/ExpressionVisitorAdapter.java

@@ -302,4 +302,9 @@ protected void visitBinaryExpression(BinaryExpression expr) {
         expr.getLeftExpression().accept(this);
         expr.getRightExpression().accept(this);
     }
+
+    @Override
+    public void visit(JsonExpression jsonExpr) {
+        visit(jsonExpr.getColumn());
+    }
 }

src/main/java/net/sf/jsqlparser/expression/JsonExpression.java

@@ -0,0 +1,91 @@
+/*
+ * #%L
+ * JSQLParser library
+ * %%
+ * Copyright (C) 2004 - 2014 JSQLParser
+ * %%
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation, either version 2.1 of the
+ * License, or (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Lesser Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Lesser Public
+ * License along with this program.  If not, see
+ * <http://www.gnu.org/licenses/lgpl-2.1.html>.
+ * #L%
+ */
+/*
+ * Copyright (C) 2014 JSQLParser.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301  USA
+ */
+
+package net.sf.jsqlparser.expression;
+
+import java.util.ArrayList;
+import java.util.List;
+import net.sf.jsqlparser.schema.Column;
+
+/**
+ *
+ * @author toben
+ */
+public class JsonExpression  implements Expression {
+
+    private Column column;
+    
+    private List<String> idents = new ArrayList<String>();
+    
+    @Override
+    public void accept(ExpressionVisitor expressionVisitor) {
+        expressionVisitor.visit(this);
+    }
+
+    public Column getColumn() {
+        return column;
+    }
+
+    public void setColumn(Column column) {
+        this.column = column;
+    }
+
+    public List<String> getIdents() {
+        return idents;
+    }
+
+    public void setIdents(List<String> idents) {
+        this.idents = idents;
+    }
+    
+    public void addIdent(String ident) {
+        idents.add(ident);
+    }
+    
+    @Override
+    public String toString() {
+        StringBuilder b = new StringBuilder();
+        b.append(column.toString());
+        for (String ident : idents) {
+            b.append("->").append(ident);
+        }
+        return b.toString();
+    }
+}

src/main/java/net/sf/jsqlparser/util/TablesNamesFinder.java

@@ -461,4 +461,8 @@ public void visit(OracleHierarchicalExpression oexpr) {
     public void visit(RegExpMatchOperator rexpr) {
         visitBinaryExpression(rexpr);
     }
+
+    @Override
+    public void visit(JsonExpression jsonExpr) {
+    }
 }

src/main/java/net/sf/jsqlparser/util/deparser/ExpressionDeParser.java

@@ -500,4 +500,9 @@ public void visit(OracleHierarchicalExpression oexpr) {
     public void visit(RegExpMatchOperator rexpr) {
         visitBinaryExpression(rexpr, " " + rexpr.getStringExpression() + " ");
     }
+
+    @Override
+    public void visit(JsonExpression jsonExpr) {
+        buffer.append(jsonExpr.toString());
+    }
 }

src/main/javacc/net/sf/jsqlparser/parser/JSqlParserCC.jj

@@ -1657,6 +1657,8 @@ Expression PrimaryExpression():
 
 	| LOOKAHEAD(ExtractExpression()) retval=ExtractExpression()
 
+    | LOOKAHEAD([sign="+" | sign="-"] JsonExpression()) [sign="+" | sign="-"] retval=JsonExpression()
+
 	| LOOKAHEAD(["+" | "-"] Function())       [sign="+" | sign="-"] retval=Function()
 
 	| LOOKAHEAD(["+" | "-"] <S_DOUBLE>)       [sign="+" | sign="-"] token=<S_DOUBLE>  { retval = new DoubleValue(token.image); }
@@ -1710,6 +1712,19 @@ JdbcNamedParameter JdbcNamedParameter() : {
 	}
 }
 
+JsonExpression JsonExpression() : {
+  JsonExpression result = new JsonExpression();
+  Column column;
+  Token token;
+}
+{
+    column=Column() ("->" token=<S_CHAR_LITERAL> {result.addIdent(token.image);} )+
+    { 
+        result.setColumn(column);
+        return result; 
+    }
+}
+
 IntervalExpression IntervalExpression() : {
 	IntervalExpression interval = new IntervalExpression();
 	Token token;

src/test/java/net/sf/jsqlparser/test/select/SelectTest.java

@@ -1430,4 +1430,8 @@ public void testNotEqualsTo() throws JSQLParserException {
         assertSqlCanBeParsedAndDeparsed("SELECT * FROM foo WHERE a != b");
         assertSqlCanBeParsedAndDeparsed("SELECT * FROM foo WHERE a <> b");
     }
+    
+    public void testJsonExpression() throws JSQLParserException {
+        assertSqlCanBeParsedAndDeparsed("SELECT data->'images'->'thumbnail'->'url' AS thumb FROM instagram");
+    }
 }