321 lines
11 KiB
Ruby
321 lines
11 KiB
Ruby
require 'set'
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require 'fileutils'
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module Rscons
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# The Environment class is the main programmatic interface to RScons. It
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# contains a collection of construction variables, options, builders, and
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# rules for building targets.
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class Environment
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# Hash of +{"builder_name" => builder_object}+ pairs.
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attr_reader :builders
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# :command, :short, or :off
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attr_accessor :echo
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# String or +nil+
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attr_reader :build_root
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def build_root=(build_root)
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@build_root = build_root.gsub('\\', '/')
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end
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# Create an Environment object.
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# @param options [Hash]
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# Possible options keys:
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# :echo => :command, :short, or :off (default :short)
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# :build_root => String specifying build root directory (default nil)
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# :exclude_builders => true to omit adding default builders (default false)
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# If a block is given, the Environment object is yielded to the block and
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# when the block returns, the {#process} method is automatically called.
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def initialize(options = {})
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@varset = VarSet.new
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@targets = {}
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@user_deps = {}
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@builders = {}
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@build_dirs = []
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@build_hooks = []
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unless options[:exclude_builders]
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DEFAULT_BUILDERS.each do |builder_class_name|
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builder_class = Builders.const_get(builder_class_name)
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builder_class or raise "Could not find builder class #{builder_class_name}"
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add_builder(builder_class.new)
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end
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end
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@echo = options[:echo] || :short
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@build_root = options[:build_root]
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if block_given?
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yield self
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self.process
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end
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end
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# Make a copy of the Environment object.
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# The cloned environment will contain a copy of all environment options,
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# construction variables, and builders (unless :exclude_builders => true is
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# passed as an option). It will not contain a copy of the targets, build
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# hooks, build directories, or the build root. If a block is given, the
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# Environment object is yielded to the block and when the block returns,
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# the {#process} method is automatically called. The possible options keys
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# match those documented in the #initialize method.
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def clone(options = {})
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env = self.class.new(
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echo: options[:echo] || @echo,
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build_root: options[:build_root],
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exclude_builders: true)
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unless options[:exclude_builders]
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@builders.each do |builder_name, builder|
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env.add_builder(builder)
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end
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end
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env.append(@varset.clone)
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if block_given?
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yield env
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env.process
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end
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env
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end
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# Add a {Builder} object to the Environment.
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def add_builder(builder)
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@builders[builder.name] = builder
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var_defs = builder.default_variables(self)
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if var_defs
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var_defs.each_pair do |var, val|
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@varset[var] ||= val
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end
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end
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end
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# Add a build hook to the Environment.
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def add_build_hook(&block)
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@build_hooks << block
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end
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# Specify a build directory for this Environment.
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# Source files from src_dir will produce object files under obj_dir.
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def build_dir(src_dir, obj_dir)
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src_dir = src_dir.gsub('\\', '/') if src_dir.is_a?(String)
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@build_dirs << [src_dir, obj_dir]
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end
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# Return the file name to be built from source_fname with suffix suffix.
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# This method takes into account the Environment's build directories.
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def get_build_fname(source_fname, suffix)
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build_fname = source_fname.set_suffix(suffix).gsub('\\', '/')
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found_match = @build_dirs.find do |src_dir, obj_dir|
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if src_dir.is_a?(Regexp)
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build_fname.sub!(src_dir, obj_dir)
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else
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build_fname.sub!(%r{^#{src_dir}/}, "#{obj_dir}/")
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end
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end
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if @build_root and not found_match
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unless Rscons.absolute_path?(source_fname) or build_fname.start_with?("#{@build_root}/")
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build_fname = "#{@build_root}/#{build_fname}"
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end
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end
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build_fname.gsub!('\\', '/')
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build_fname
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end
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# Access a construction variable or environment option.
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# @see VarSet#[]
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def [](*args)
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@varset.send(:[], *args)
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end
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# Set a construction variable or environment option.
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# @see VarSet#[]=
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def []=(*args)
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@varset.send(:[]=, *args)
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end
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# Add a set of construction variables or environment options.
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# @see VarSet#append
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def append(*args)
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@varset.send(:append, *args)
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end
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# Build all target specified in the Environment.
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# When a block is passed to Environment.new, this method is automatically
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# called after the block returns.
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def process
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cache = Cache.new
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targets_processed = {}
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process_target = proc do |target|
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targets_processed[target] ||= begin
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@targets[target][:source].each do |src|
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if @targets.include?(src) and not targets_processed.include?(src)
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process_target.call(src)
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end
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end
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result = run_builder(@targets[target][:builder],
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target,
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@targets[target][:source],
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cache,
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@targets[target][:vars] || {})
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unless result
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cache.write
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raise BuildError.new("Failed to build #{target}")
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end
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result
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end
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end
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@targets.each do |target, info|
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process_target.call(target)
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end
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cache.write
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end
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# Clear all targets registered for the Environment.
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def clear_targets
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@targets = {}
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end
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# Build a command line from the given template, resolving references to
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# variables using the Environment's construction variables and any extra
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# variables specified.
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# @param command_template [Array] template for the command with variable
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# references
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# @param extra_vars [Hash, VarSet] extra variables to use in addition to
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# (or replace) the Environment's construction variables when building
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# the command
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def build_command(command_template, extra_vars)
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@varset.merge(extra_vars).expand_varref(command_template)
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end
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# Expand a construction variable reference (String or Array)
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def expand_varref(varref)
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@varset.expand_varref(varref)
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end
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# Execute a builder command
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# @param short_desc [String] Message to print if the Environment's echo
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# mode is set to :short
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# @param command [Array] The command to execute.
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# @param options [Hash] Optional options to pass to Kernel#system.
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def execute(short_desc, command, options = {})
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print_command = proc do
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puts command.map { |c| c =~ /\s/ ? "'#{c}'" : c }.join(' ')
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end
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if @echo == :command
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print_command.call
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elsif @echo == :short
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puts short_desc
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end
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system(*command, options).tap do |result|
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unless result or @echo == :command
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$stdout.write "Failed command was: "
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print_command.call
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end
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end
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end
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alias_method :orig_method_missing, :method_missing
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def method_missing(method, *args)
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if @builders.has_key?(method.to_s)
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target, source, vars, *rest = args
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unless vars.nil? or vars.is_a?(Hash) or vars.is_a?(VarSet)
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raise "Unexpected construction variable set: #{vars.inspect}"
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end
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source = [source] unless source.is_a?(Array)
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@targets[target] = {
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builder: @builders[method.to_s],
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source: source,
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vars: vars,
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args: rest,
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}
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else
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orig_method_missing(method, *args)
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end
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end
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# Manually record a given target as depending on the specified
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# dependency files.
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def depends(target, *user_deps)
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@user_deps[target] ||= []
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@user_deps[target] = (@user_deps[target] + user_deps).uniq
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end
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# Return the list of user dependencies for a given target, or +nil+ for
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# none.
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def get_user_deps(target)
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@user_deps[target]
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end
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# Build a list of source files into files containing one of the suffixes
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# given by suffixes.
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# This method is used internally by RScons builders.
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# @param sources [Array] List of source files to build.
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# @param suffixes [Array] List of suffixes to try to convert source files into.
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# @param cache [Cache] The Cache.
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# @param vars [Hash] Extra variables to pass to the builder.
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# Return a list of the converted file names.
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def build_sources(sources, suffixes, cache, vars)
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sources.map do |source|
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if source.end_with?(*suffixes)
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source
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else
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converted = nil
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suffixes.each do |suffix|
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converted_fname = get_build_fname(source, suffix)
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builder = @builders.values.find { |b| b.produces?(converted_fname, source, self) }
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if builder
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converted = run_builder(builder, converted_fname, [source], cache, vars)
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return nil unless converted
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break
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end
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end
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converted or raise "Could not find a builder to handle #{source.inspect}."
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end
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end
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end
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# Invoke a builder to build the given target based on the given sources.
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# @param builder [Builder] The Builder to use.
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# @param target [String] The target output file.
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# @param sources [Array] List of source files.
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# @param cache [Cache] The Cache.
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# @param vars [Hash] Extra variables to pass to the builder.
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# Return the result of the builder's run() method.
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def run_builder(builder, target, sources, cache, vars)
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vars = @varset.merge(vars)
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@build_hooks.each do |build_hook_block|
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build_operation = {
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builder: builder,
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target: target,
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sources: sources,
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vars: vars,
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}
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build_hook_block.call(build_operation)
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end
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builder.run(target, sources, cache, self, vars)
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end
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# Parse dependencies for a given target from a Makefile.
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# This method is used internally by RScons builders.
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# @param mf_fname [String] File name of the Makefile to read.
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# @param target [String] Name of the target to gather dependencies for.
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def self.parse_makefile_deps(mf_fname, target)
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deps = []
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buildup = ''
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File.read(mf_fname).each_line do |line|
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if line =~ /^(.*)\\\s*$/
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buildup += ' ' + $1
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else
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buildup += ' ' + line
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if buildup =~ /^(.*): (.*)$/
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mf_target, mf_deps = $1.strip, $2
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if mf_target == target
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deps += mf_deps.split(' ').map(&:strip)
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end
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end
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buildup = ''
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end
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end
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deps
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end
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end
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end
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