[#772] Support multiline string in " quoted string

lib/fluent/config/basic_parser.rb

@@ -28,6 +28,7 @@ def initialize(strscan)
       SPACING = /(?:[ \t\r\n]|\z|\#.*?(?:\z|[\r\n]))+/
       ZERO_OR_MORE_SPACING = /(?:[ \t\r\n]|\z|\#.*?(?:\z|[\r\n]))*/
       SPACING_WITHOUT_COMMENT = /(?:[ \t\r\n]|\z)+/
+      LINE_END_WITHOUT_SPACING_AND_COMMENT = /(?:\z|[\r\n])/
 
       module ClassMethods
         def symbol(string)
@@ -71,6 +72,10 @@ def prev_match
         @ss[0]
       end
 
+      def check(pattern)
+        @ss.check(pattern)
+      end
+
       def line_end
         skip(LINE_END)
       end

lib/fluent/config/literal_parser.rb

@@ -81,6 +81,11 @@ def scan_double_quoted_string
         while true
           if skip(/\"/)
             return string.join
+          elsif check(/[^"]#{LINE_END_WITHOUT_SPACING_AND_COMMENT}/)
+            if s = check(/[^\\]#{LINE_END_WITHOUT_SPACING_AND_COMMENT}/)
+              string << s
+            end
+            skip(/[^"]#{LINE_END_WITHOUT_SPACING_AND_COMMENT}/)
           elsif s = scan(/\\./)
             string << eval_escape_char(s[1,1])
           elsif skip(/\#\{/)

test/config/test_config_parser.rb

@@ -5,6 +5,7 @@
 require "fluent/config/basic_parser"
 require "fluent/config/literal_parser"
 require "fluent/config/v1_parser"
+require 'fluent/config/parser'
 
 module Fluent::Config
   module V1TestHelper
@@ -129,6 +130,7 @@ def parse_text(text)
         test "requires escaping double quote" do
           assert_text_parsed_as(e('ROOT', '', {"k1" => '"'}), '  k1 "\\""')
           assert_parse_error('  k1 """')
+          assert_parse_error('  k1 ""\'')
         end
 
         test "removes backslash in front of a normal character" do
@@ -138,6 +140,39 @@ def parse_text(text)
         test "accepts escape characters" do
           assert_text_parsed_as(e('ROOT', '', {"k1" => "\n"}), '  k1 "\\n"')
         end
+
+        test "support multiline string" do
+          assert_text_parsed_as(e('ROOT', '',
+            {"k1" => %[line1
+                       line2]
+            }),
+            %[k1      "line1
+                       line2"]
+          )
+          assert_text_parsed_as(e('ROOT', '',
+            {"k1" => %[line1                       line2]
+            }),
+            %[k1      "line1\\
+                       line2"]
+          )
+          assert_text_parsed_as(e('ROOT', '',
+            {"k1" => %[line1
+                       line2
+                       line3]
+            }),
+            %[k1      "line1
+                       line2
+                       line3"]
+          )
+          assert_text_parsed_as(e('ROOT', '',
+            {"k1" => %[line1
+                       line2                       line3]
+            }),
+            %[k1      "line1
+                       line2\\
+                       line3"]
+          )
+        end
       end
 
       sub_test_case 'single quoted string' do

test/config/test_literal_parser.rb

@@ -109,6 +109,8 @@ def test_falseX
       test('"\\0"') { assert_parse_error('"\\0"') }  # unknown escaped character
       test('"\\1"') { assert_parse_error('"\\1"') }  # unknown escaped character
       test('"t') { assert_parse_error('"t') }  # non-terminated quoted character
+      test("\"t\nt\"") { assert_text_parsed_as("t\nt", "\"t\nt\"" ) } # multiline string
+      test("\"t\\\nt\"") { assert_text_parsed_as("tt", "\"t\\\nt\"" ) } # multiline string
       test('t"') { assert_text_parsed_as('t"', 't"') }
       test('"."') { assert_text_parsed_as('.', '"."') }
       test('"*"') { assert_text_parsed_as('*', '"*"') }