Add lexer and parser sources

Rakefile

@@ -3,74 +3,39 @@
 # obtain one at https://mozilla.org/MPL/2.0/.
 
 require 'pathname'
-require 'open3'
 require 'rake/clean'
-require_relative 'tools/support'
 
-# Dependencies.
-GCC_VERSION = "15.1.0"
-
-# Paths.
-HOST_GCC = TMP + 'host/gcc'
+TMP = Pathname.new('./build')
 HOST_INSTALL = TMP + 'host/install'
 
 CLOBBER.include TMP
+CLEAN.include(TMP + 'boot')
 
-directory(TMP + 'tools')
-directory HOST_GCC
 directory HOST_INSTALL
 
-task default: [TMP + 'elna'] do
-  sh (TMP + 'elna').to_path, '--parse', 'source.elna'
+task default: ['source/main.elna', TMP + 'boot/elna'] do |t|
+  sources, compiler  = t.prerequisites.partition { |f| f.end_with? '.elna' }
+
+  sh *compiler, '--parse', *sources
 end
 
-namespace :boot do
-  desc 'Download and configure the bootstrap compiler'
-  task configure: [TMP + 'tools', HOST_GCC, HOST_INSTALL] do
-    url = URI.parse "https://gcc.gnu.org/pub/gcc/releases/gcc-#{GCC_VERSION}/gcc-#{GCC_VERSION}.tar.xz"
-    options = find_build_target GCC_VERSION
-    source_directory = TMP + "tools/gcc-#{GCC_VERSION}"
-    frontend_link = source_directory + 'gcc'
+rule(/boot\/.+\.o$/ => ->(file) {
+  Pathname.new('source') +
+    Pathname.new(file).relative_path_from(TMP + 'boot').sub_ext('.elna')
+}) do |t|
+  Pathname.new(t.name).dirname.mkpath
+  compiler = HOST_INSTALL + 'bin/gelna'
 
-    download_and_pipe url, source_directory.dirname, ['tar', '-Jxv']
-
-    sh 'contrib/download_prerequisites', chdir: source_directory.to_path
-    File.symlink Pathname.new('.').relative_path_from(frontend_link), (frontend_link + 'elna')
-
-    configure_options = [
-      "--prefix=#{HOST_INSTALL.realpath}",
-      "--with-sysroot=#{options.sysroot.realpath}",
-      '--enable-languages=c,c++,elna',
-      '--disable-bootstrap',
-      '--disable-multilib',
-      "--target=#{options.build}",
-      "--build=#{options.build}",
-      "--host=#{options.build}"
-    ]
-    flags = '-O0 -g -fPIC -I/opt/homebrew/Cellar/flex/2.6.4_2/include'
-    env = {
-      'CC' => options.gcc,
-      'CXX' => options.gxx,
-      'CFLAGS' => flags,
-      'CXXFLAGS' => flags,
-    }
-    configure = source_directory.relative_path_from(HOST_GCC) + 'configure'
-    sh env, configure.to_path, *configure_options, chdir: HOST_GCC.to_path
-  end
-
-  desc 'Make and install the bootstrap compiler'
-  task :make do
-    cwd = HOST_GCC.to_path
-
-    sh 'make', '-j', Etc.nprocessors.to_s, chdir: cwd
-    sh 'make', 'install', chdir: cwd
-  end
+  sh compiler.to_path, '-c', '-o', t.name, *t.prerequisites
 end
 
-desc 'Build the bootstrap compiler'
-task boot: %w[boot:configure boot:make]
+file TMP + 'boot/elna' => FileList['source/**/*.elna'].reject { |file|
+  file != file.downcase
+}.map { |file|
+  TMP + 'boot' +
+    Pathname.new(file).relative_path_from('source').sub_ext('.o')
+} do |t|
+  compiler = HOST_INSTALL + 'bin/gcc'
 
-file (TMP + 'elna').to_path => ['source.elna']
-file (TMP + 'elna').to_path => [(HOST_INSTALL + 'bin/gelna').to_path] do |task|
-  sh (HOST_INSTALL + 'bin/gelna').to_path, '-o', task.name, task.prerequisites.first
+  sh compiler.to_path, '-o', t.name, *t.prerequisites
 end