Test the parser, and clean up ID having multiple parts

spec/parser_spec.rb

@@ -0,0 +1,154 @@
+require "spec_helper"
+
+describe "Parser" do
+  let(:handlebars) { @context["Handlebars"] }
+
+  def program(&block)
+    ASTBuilder.build do
+      program do
+        instance_eval(&block)
+      end
+    end
+  end
+
+  def ast_for(string)
+    ast = handlebars.parse(string)
+    handlebars.print(ast)
+  end
+
+  class ASTBuilder
+    def self.build(&block)
+      ret = new
+      ret.evaluate(&block)
+      ret.out
+    end
+
+    attr_reader :out
+
+    def initialize
+      @padding = 0
+      @out = ""
+    end
+
+    def evaluate(&block)
+      instance_eval(&block)
+    end
+
+    def pad(string)
+      @out << ("  " * @padding) + string + "\n"
+    end
+
+    def with_padding
+      @padding += 1
+      ret = yield
+      @padding -= 1
+      ret
+    end
+
+    def program
+      pad("PROGRAM:")
+      with_padding { yield }
+    end
+
+    def inverse
+      pad("{{^}}")
+      with_padding { yield }
+    end
+
+    def block
+      pad("BLOCK:")
+      with_padding { yield }
+    end
+
+    def mustache(id, *params)
+      pad("{{ #{id} [#{params.join(", ")}] }}")
+    end
+
+    def partial(id)
+      pad("{{> #{id} }}")
+    end
+
+    def comment(comment)
+      pad("{{! '#{comment}' }}")
+    end
+
+    def content(string)
+      pad("CONTENT[ '#{string}' ]")
+    end
+
+    def string(string)
+      string.inspect
+    end
+
+    def id(id)
+      "ID:#{id}"
+    end
+
+    def path(*parts)
+      "PATH:#{parts.join("/")}"
+    end
+  end
+
+  it "parses simple mustaches" do
+    ast_for("{{foo}}").should == program { mustache id("foo") }
+  end
+
+  it "parses mustaches with paths" do
+    ast_for("{{foo/bar}}").should == program { mustache path("foo", "bar") }
+  end
+
+  it "parses mustaches with parameters" do
+    ast_for("{{foo bar}}").should == program { mustache id("foo"), id("bar") }
+  end
+
+  it "parses mustaches with string parameters" do
+    ast_for("{{foo bar \"baz\" }}").should == program { mustache id("foo"), id("bar"), string("baz")}
+  end
+
+  it "parses contents followed by a mustache" do
+    ast_for("foo bar {{baz}}").should == program do
+      content "foo bar "
+      mustache id("baz")
+    end
+  end
+
+  it "parses a partial" do
+    ast_for("{{> foo }}").should == program { partial id("foo") }
+  end
+
+  it "parses a comment" do
+    ast_for("{{! this is a comment }}").should == program do
+      comment " this is a comment "
+    end
+  end
+
+  it "parses an inverse section" do
+    ast_for("{{#foo}} bar {{^}} baz {{/foo}}").should == program do
+      block do
+        mustache id("foo")
+
+        program do
+          content " bar "
+        end
+
+        inverse do
+          content " baz "
+        end
+      end
+    end
+  end
+
+  it "raises if there's a Parse error" do
+    lambda { ast_for("{{foo}") }.should   raise_error(V8::JSError, /Parse error on line 1/)
+    lambda { ast_for("{{foo &}}")}.should raise_error(V8::JSError, /Parse error on line 1/)
+  end
+
+  it "knows how to report the correct line number in errors" do
+    lambda { ast_for("hello\nmy\n{{foo}") }.should     raise_error(V8::JSError, /Parse error on line 3/m)
+    lambda { ast_for("hello\n\nmy\n\n{{foo}") }.should raise_error(V8::JSError, /Parse error on line 5/m)
+  end
+
+  it "knows how to report the correct line number in errors when the first character is a newline" do
+    lambda { ast_for("\n\nhello\n\nmy\n\n{{foo}") }.should raise_error(V8::JSError, /Parse error on line 7/m)
+  end
+end