Improved config parsing

src/tartrazine.cr

@@ -3,6 +3,11 @@ require "xml"
 module Tartrazine
   VERSION = "0.1.0"
 
+  class State
+    property name : String = ""
+    property rules = [] of String
+  end
+
   class Lexer
     property config = {
       name:       "",
@@ -12,6 +17,8 @@ module Tartrazine
       priority:   0,
     }
 
+    property states = [] of State
+
     def self.from_xml(xml : String) : Lexer
       l = Lexer.new
       lexer = XML.parse(xml).first_element_child
@@ -19,25 +26,39 @@ module Tartrazine
         config = lexer.children.find { |n| n.name == "config" }
         if config
           l.config = {
-            name:       xml_to_s(config, name),
-            aliases:    xml_to_a(config, _alias),
-            filenames:  xml_to_a(config, filename),
-            mime_types: xml_to_a(config, mime_type),
-            priority:   xml_to_s(config, priority).to_i,
+            name:       xml_to_s(config, name) || "",
+            aliases:    xml_to_a(config, _alias) || [] of String,
+            filenames:  xml_to_a(config, filename) || [] of String,
+            mime_types: xml_to_a(config, mime_type) || [] of String,
+            priority:   xml_to_i(config, priority) || 0,
           }
         end
+
+        rules = lexer.children.find { |n| n.name == "rules" }
+        if rules
+          # Rules contains states 🤷
+          rules.children.select { |n| n.name == "state" }.each do |node|
+            state = State.new
+            state.name = node["name"]
+            l.states << state
+          end
+        end
       end
       l
     end
   end
 end
 
-l = Tartrazine::Lexer.from_xml(File.read("lexers/plaintext.xml"))
-p! l.config
+l = Tartrazine::Lexer.from_xml(File.read("lexers/bash.xml"))
+p! l.config, l.states
 
 # Convenience macros to parse XML
 macro xml_to_s(node, name)
-{{node}}.children.find{|n| n.name == "{{name}}".lstrip("_")}.as(XML::Node).content.to_s
+{{node}}.children.find{|n| n.name == "{{name}}".lstrip("_")}.try &.content.to_s
+end
+
+macro xml_to_i(node, name)
+({{node}}.children.find{|n| n.name == "{{name}}".lstrip("_")}.try &.content.to_s.to_i)
 end
 
 macro xml_to_a(node, name)