Class: HDLRuby::HDRLoad

Inherits:
Object
  • Object
show all
Defined in:
lib/HDLRuby/hdrcc.rb,
lib/HDLRuby/hdrlib.rb

Overview

Class for loading HDLRuby files.

Constant Summary collapse

TOP_NAME =

TOP_NAME = "hdr_top_instance"

"__"

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(top_system, top_file, dir, *params) ⇒ HDRLoad

Creates a new loader for a +top_system+ system in file +top_file_name+ from directory +dir+ with generic parameters +params+.

NOTE: +top_file+ can either be a file or a file name.



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# File 'lib/HDLRuby/hdrcc.rb', line 94

def initialize(top_system,top_file,dir,*params)
    # Sets the top and the looking directory.
    @top_system = top_system.to_s
    # @top_file can either be a file or a string giving the file name.
    if top_file.respond_to?(:path) then
        @top_file = top_file
        @top_file_name = top_file.path
    else
        @top_file = nil
        @top_file_name = top_file.to_s
    end
    @dir = dir.to_s
    @params = params

    # The list of the standard library files to exclude for
    # checking.
    # Get the directory of the HDLRuby and Ruby standard libraries.
    @std_dirs = $LOAD_PATH
    # @std_dirs << File.dirname(__FILE__) + "/std"
    # # Gather the files with their path to std.
    # @std_files = Dir[@std_dir + "/*"]

    # The list of required files.
    @requires = []

    # The list of the code texts (the first one should be the one
    # containing the top system).
    @texts = []

    # The list of the code checkers.
    @checks = []

    # The name of the top instance
    @top_name = TOP_NAME
end

Instance Attribute Details

#requires ⇒ Object (readonly)

The required files.



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# File 'lib/HDLRuby/hdrcc.rb', line 88

def requires
  @requires
end

#top_instance ⇒ Object (readonly)

The top instance, only accessible after parsing the files.



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# File 'lib/HDLRuby/hdrcc.rb', line 85

def top_instance
  @top_instance
end

Instance Method Details

#check_all ⇒ Object

Checks the read files.



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# File 'lib/HDLRuby/hdrcc.rb', line 191

def check_all
    @checks.each { |check| check.assign_check }
end

#get_top ⇒ Object

Gets the (first) top system.



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# File 'lib/HDLRuby/hdrcc.rb', line 202

def get_top
    # Get all the systems.
    systems = @checks.reduce([]) {|ar,check| ar + check.get_all_systems}
    # show? "First systems=#{systems}"
    # Remove the systems that are instantiated or included
    # (they cannot be tops)
    @checks.each do |check|
        # The instances
        check.get_all_instances(systems).each do |instance|
            systems.delete(check.get_instance_system(instance))
        end
        # The explicitly included systems
        check.get_all_includes(systems).each do |included|
            systems.delete(check.get_include_system(included))
        end
        # The system included when declaring (inheritance)
        check.get_all_inherits(systems).each do |inherit|
            systems -= check.get_inherit_systems(inherit)
        end
    end
    # show? "Now systems=#{systems}"
    # Return the first top of the list.
    return systems[-1]
end

#parse ⇒ Object

Load the HDLRuby structure from an instance of the top module.



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# File 'lib/HDLRuby/hdrcc.rb', line 229

def parse
    # Is there a top system specified yet?
    if @top_system == "" then
        # No, look for it.
        @top_system = get_top
        # show? "@top_system=#{@top_system}"
        unless @top_system then
            # Not found? Error.
            # Maybe it is a parse error, look for it.
            bind = TOPLEVEL_BINDING.clone
            eval("require 'HDLRuby'\n\nconfigure_high\n\n",bind)
            eval(@texts[0],bind,@top_file_name,1)
            # No parse error found.
            raise "Cannot find a top system." unless @top_system
        end
    end
    # Initialize the environment for processing the hdr file.
    bind = TOPLEVEL_BINDING.clone
    eval("require 'HDLRuby'\n\nconfigure_high\n\n",bind)
    # Process it.
    eval(@texts[0],bind,@top_file_name,1)
    # Get the resulting instance
    if @params.empty? then
        # There is no generic parameter
        @top_instance = 
            eval("#{@top_system} :#{@top_name}\n#{@top_name}",bind)
    else
        # There are generic parameters
        @top_instance = 
            # eval("#{@top_system} :#{@top_name},#{@params.join(",")}\n#{@top_name}",bind)
            eval("#{@top_system}(#{@params.join(",")}).(:#{@top_name})\n#{@top_name}",bind)
    end
end

#read(file) ⇒ Object

Loads a single +file+.

NOTE: +file+ can either be a file or a file name.



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# File 'lib/HDLRuby/hdrcc.rb', line 133

def read(file)
    # Resolve the file.
    if file.respond_to?(:read) then
        found = file
    else
        found = File.join(@dir,file)
        unless File.exist?(found) then
            founds = Dir.glob(@std_dirs.map do |path|
                File.join(path,file) 
            end)
            if founds.empty? then
                # No standard file with this name, this is an error.
                raise "Unknown required file: #{file}."
            else
                # A standard file is found, skip it since it does not
                # need to be read.
                # show? "Standard files: #{founds}"
                return false
            end
        end
    end
    # Load the file.
    @texts << File.read(found)
    if found.respond_to?(:path) then
        @checks << Checker.new(@texts[-1],found.path)
    else
        @checks << Checker.new(@texts[-1])
    end
    return true
end

#read_all(file = nil) ⇒ Object

Loads all the files from +file+.



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# File 'lib/HDLRuby/hdrcc.rb', line 165

def read_all(file = nil)
    unless file then
        if @top_file then
            file = @top_file
        else
            file = @top_file_name
        end
    end
    # show? "read_all with file=#{file}"
    # Read the file
    # read(file)
    unless read(file) then
        # The file is to skip.
        return
    end
    # Get its required files.
    requires = @checks[-1].get_all_requires +
               @checks[-1].get_all_require_relatives
    requires.each do |file|
        read_all(file)
    end
    @requires += requires
    @requires.uniq!
end

#show_all(outfile = $stdout) ⇒ Object

Displays the syntax tree of all the files.



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# File 'lib/HDLRuby/hdrcc.rb', line 196

def show_all(outfile = $stdout)
    # show? "@checks.size=#{@checks.size}"
    @checks.each { |check| check.show(outfile) }
end