Multi-lines + exceptions give the erroneous line.

shard.yml

@@ -1,5 +1,5 @@
 name: specparser
-version: 0.5.0
+version: 0.5.1
 
 authors:
      - Philippe Pittoli <karchnu@karchnu.fr>

src/specparser.cr

@@ -81,13 +81,14 @@ class SpecParser
 
 	property assignments : Hash(String, StringContainer | LongStringContainer | ArrayContainer)
 	property sections : Array(Section)
+	property current_line_number = 0
 
 	def initialize
 		@assignments = Hash(String, StringContainer | LongStringContainer | ArrayContainer).new
 		@sections = Array(Section).new
 	end
 
-	def parse_assignment (line : String)
+	def parse_assignment (line : String, content : Array(String))
 		# puts "simple assignment: #{line}"
 
 		name = /([a-zA-Z][a-zA-Z0-9-_]*):/.match(line).try &.[1]
@@ -100,6 +101,9 @@ class SpecParser
 			return
 		end
 
+		# In case the content is over several lines.
+		value = grab_content content, value
+
 		@assignments[name] = StringContainer.new value.lstrip(" ").rstrip(" ")
 	end
 
@@ -110,14 +114,17 @@ class SpecParser
 		list = Array(String).new
 
 		while line = content.shift?
+			@current_line_number += 1
 			case line
 			when /^[ \t]*(#.*)?$/
 				# puts "blank line or comment, still in a list"
 			when /^[ \t]+-([^#]*)/
 				# puts "line content: #{$~[1]}"
-				list.push $~[1].lstrip(" ").rstrip(" ")
+				current_line = $~[1].lstrip(" ")
+				list.push grab_content(content, current_line)
 			else
 				content.unshift line
+				@current_line_number -= 1
 				break
 			end
 		end
@@ -138,6 +145,7 @@ class SpecParser
 
 		value = String.build do |str|
 			while line = content.shift?
+				@current_line_number += 1
 				case line
 				when /^[ \t]*(#.*)?$/
 					# puts "blank line or comment, still in a code block"
@@ -148,6 +156,7 @@ class SpecParser
 					str << "#{$~[1]}\n"
 				else
 					content.unshift line
+					@current_line_number -= 1
 					break
 				end
 			end
@@ -178,6 +187,7 @@ class SpecParser
 		end
 
 		while line = content.shift?
+			@current_line_number += 1
 			case line
 			when /^[ \t]*#.*$/
 				# puts "blank line or comment, still in a section"
@@ -194,6 +204,7 @@ class SpecParser
 
 				codeblockvalue = String.build do |str|
 					while line = content.shift?
+						@current_line_number += 1
 						case line
 						when /^[ \t]*#.*?$/
 							# puts "blank line or comment, still in a free text in a section"
@@ -202,6 +213,7 @@ class SpecParser
 							str << "#{$~[1]}\n"
 						else
 							content.unshift line
+							@current_line_number -= 1
 							break
 						end
 					end
@@ -216,6 +228,7 @@ class SpecParser
 
 				list = Array(String).new
 				while line = content.shift?
+					@current_line_number += 1
 					case line
 					when /^[ \t]*#.*?$/
 						# puts "blank line or comment, still in a list in a section"
@@ -225,6 +238,7 @@ class SpecParser
 						list.push lcontent
 					else
 						content.unshift line
+						@current_line_number -= 1
 						break
 					end
 				end
@@ -236,6 +250,7 @@ class SpecParser
 				section.content[lname] = ArrayContainer.new list
 			else
 				content.unshift line
+				@current_line_number -= 1
 				break
 			end
 		end
@@ -243,13 +258,32 @@ class SpecParser
 		sections.push section
 	end
 
+	# Remove \n when line ends with a backslash.
+	def grab_content(content : Array(String), current_value : String)
+		while current_value =~ /\\$/
+			# Remove trailing backslash
+			current_value = current_value.rstrip "\\"
+			nl = content.shift?
+			if nl
+				@current_line_number += 1
+				current_value += nl.lstrip
+			else
+				raise Exception.new "last line is ending with a backslash"
+			end
+		end
+
+		current_value
+	end
+
 	def parse_lines(content : Array(String))
 		while line = content.shift?
+			@current_line_number += 1
+
 			case line
 			when /^[a-zA-Z][a-zA-Z0-9-_]*:[ \t]*([#].*)?$/
-				parse_list line,  content
+				parse_list line, content
 			when /^[a-zA-Z][a-zA-Z0-9-_]*:[ \t]+[^#]+/
-				parse_assignment line
+				parse_assignment line, content
 			when /^[@][a-zA-Z][a-zA-Z0-9-_]*[ \t]*([#].*)?/
 				parse_code_block line, content
 			when /^[%][a-zA-Z][a-zA-Z0-9-_]*[ \t]*([#].*)?/
@@ -259,7 +293,7 @@ class SpecParser
 			when /^[ \t]+$/
 				# puts "empty line"
 			when /^[ \t]+[^ \t#]/
-				raise "line starting with spaces or a tabulation outside a list or a section: should not happen"
+				raise Exception.new "line #{@current_line_number}: line starting with spaces or a tabulation outside a list or a section: should not happen"
 			end
 		end
 	end
@@ -393,6 +427,6 @@ class SpecParser
 
 		specs
 	rescue e
-		raise Exception.new "unexpected parser error: #{e}"
+		raise Exception.new "unexpected parser error: #{e}, current line #{specs.not_nil!.current_line_number}"
 	end
 end