feature: support restore semicolon.

Author: albin3

README.md

@@ -1,6 +1,6 @@
 # js-sql-parser
 
-> parse sql (select grammar) in js.
+> parse / stringify sql (select grammar) in js.
 
 [![Build Status][travis-image]][travis-url]
 [![NPM Version][npm-image]][npm-url]
@@ -29,11 +29,17 @@ sql grammar follows https://dev.mysql.com/doc/refman/5.7/en/select.html
 
 `npm install --save js-sql-parser`
 
-```
+```js
 const parser = require('js-sql-parser');
 const ast = parser.parse('select * from dual');
 
 console.log(JSON.stringify(ast, null, 2));
+
+ast.value.selectItems.value[0].value = 'foo';
+ast.value.from.value[0].value.value.value = 'bar';
+
+console.log(parser.stringify(ast));
+// SELECT foo FROM bar
 ```
 
 ## script tag
@@ -42,7 +48,8 @@ console.log(JSON.stringify(ast, null, 2));
 <script src="./dist/parser/sqlParser.js"><script/>
 
 var sqlParser = window.sqlParser;
-sqlParser.parse('select * from dual');
+var ast = sqlParser.parse('select * from dual');
+var sql = sqlParser.stringify(ast);
 ```
 
 ## AMD support

package.json

@@ -25,6 +25,7 @@
     "babel-preset-es2015": "^6.22.0",
     "babel-register": "^6.22.0",
     "benchmark": "^2.1.3",
+    "debug": "^3.1.0",
     "jison": "^0.4.17",
     "mocha": "^3.2.0"
   }

src/sqlParser.jison

@@ -160,7 +160,7 @@ LIMIT                                                             return 'LIMIT'
 
 main
   : selectClause EOF { return {nodeType: 'Main', value: $1}; }
-  | selectClause ';' EOF { return {nodeType: 'Main', value: $1}; }
+  | selectClause ';' EOF { return {nodeType: 'Main', value: $1, hasSemicolon: true}; }
   ;
 
 selectClause

src/stringify.js

@@ -56,6 +56,9 @@ Sql.prototype.append = function(word, noPrefix, noSuffix) {
 }
 Sql.prototype.travelMain = function(ast) {
   this.travelSelect(ast.value);
+  if (ast.hasSemicolon) {
+    this.append(';', true);
+  }
 }
 Sql.prototype.travelSelect = function(ast) {
   this.appendKeyword('select', true);

test/main.test.js

@@ -1,6 +1,6 @@
 'use strict';
 
-const debug = false;
+const debug = require('debug')('js-sql-parser');
 const parser = require('../');
 
 const testParser = function (sql) {
@@ -15,14 +15,8 @@ const testParser = function (sql) {
     throw 'err firstSql don\'t equals secondSql. ';
   }
 
-  if (debug) {
-    console.log(
-      JSON.stringify(secondAst, null, 2)
-    );
-    console.log(
-      parser.stringify(secondAst)
-    );
-  }
+  debug(JSON.stringify(secondAst, null, 2));
+  debug(parser.stringify(secondAst));
 
   return secondAst;
 }
@@ -138,5 +132,9 @@ AND (rd.rd_numberofrooms <= (select sum(rn.reservation_numberofrooms) as count_r
   it ('fix not equal.', function () {
     testParser('select a from b where a <> 1 limit 2, 3');
   });
+
+  it ('restore semicolon.', function () {
+    testParser('select a from b limit 2;');
+  });
 });