Rename to propane

spec/propane_spec.rb

@@ -0,0 +1,97 @@
+require "fileutils"
+
+describe Propane do
+  def write_grammar(grammar)
+    File.write("spec/run/testparser.i", grammar)
+  end
+
+  def build_parser
+    result = system(*%w[./propane.sh spec/run/testparser.i spec/run/testparser.d])
+    expect(result).to be_truthy
+  end
+
+  def compile(test_file)
+    result = system(*%w[gdc -funittest -o spec/run/testparser spec/run/testparser.d], test_file)
+    expect(result).to be_truthy
+  end
+
+  def run
+    result = system("spec/run/testparser")
+    expect(result).to be_truthy
+  end
+
+  before(:each) do
+    FileUtils.rm_rf("spec/run")
+    FileUtils.mkdir_p("spec/run")
+  end
+
+  it "generates a D lexer" do
+    write_grammar <<EOF
+token int \\d+
+token plus \\+
+token times \\*
+drop \\s+
+Start: [Foo] <<
+>>
+Foo: [int] <<
+>>
+Foo: [plus] <<
+>>
+EOF
+    build_parser
+    compile("spec/test_d_lexer.d")
+    run
+  end
+
+  it "generates a parser" do
+    write_grammar <<EOF
+token plus \\+
+token times \\*
+token zero 0
+token one 1
+Start: [E] <<
+>>
+E: [E times B] <<
+>>
+E: [E plus B] <<
+>>
+E: [B] <<
+>>
+B: [zero] <<
+>>
+B: [one] <<
+>>
+EOF
+    build_parser
+  end
+
+  it "distinguishes between multiple identical rules with lookahead symbol" do
+    write_grammar <<EOF
+token a
+token b
+Start: [R1 a] <<
+>>
+Start: [R2 b] <<
+>>
+R1: [a b] <<
+>>
+R2: [a b] <<
+>>
+EOF
+    build_parser
+  end
+
+  it "handles reducing a rule that could be arrived at from multiple states" do
+    write_grammar <<EOF
+token a
+token b
+Start: [a R1] <<
+>>
+Start: [b R1] <<
+>>
+R1: [b] <<
+>>
+EOF
+    build_parser
+  end
+end