Class: Rscons::BasicEnvironment

Inherits:
Object
  • Object
show all
Defined in:
lib/rscons/basic_environment.rb

Overview

The BasicEnvironment class contains a collection of construction variables.

Direct Known Subclasses

Environment

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ BasicEnvironment

Create a BasicEnvironment object.

Parameters:

  • options (Hash) (defaults to: {}) —

    Construction options.

Options Hash (options):

  • :use (String, Array<String>) —

    Use flag(s). If specified, any configuration flags which were saved with a corresponding `:use` value will be applied to this Environment.



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# File 'lib/rscons/basic_environment.rb', line 12

def initialize(options = {})
  @varset = VarSet.new(Rscons::DEFAULT_CONSTRUCTION_VARIABLES)
  load_configuration_data!(options)
end

Instance Method Details

#[](key) ⇒ Object

Access the value of a construction variable.

Parameters:

  • key (String, Symbol) —

    The construction variable name.

Returns:

  • (Object) —

    The construction variable's value.



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# File 'lib/rscons/basic_environment.rb', line 24

def [](key)
  @varset[key]
end

#[]=(key, val) ⇒ Object

Assign a value to a construction variable.

Parameters:

  • key (String, Symbol) —

    The construction variable name.

  • val (Object) —

    The value to set.



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# File 'lib/rscons/basic_environment.rb', line 51

def []=(key, val)
  @varset[key] = val
end

#append(values) ⇒ void

This method returns an undefined value.

Add a set of construction variables to the BasicEnvironment.

Parameters:

  • values (VarSet, Hash) —

    New set of variables.



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# File 'lib/rscons/basic_environment.rb', line 60

def append(values)
  @varset.append(values)
end

#apply_configuration_data!(vars) ⇒ Object

Load a specific set of construction variables saved from the configure operation.



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# File 'lib/rscons/basic_environment.rb', line 237

def apply_configuration_data!(vars)
  if merge_vars = vars["merge"]
    append(merge_vars)
  end
  if append_vars = vars["append"]
    merge_flags(append_vars)
  end
  if parse_vars = vars["parse"]
    parse_vars.each do |parse_string|
      parse_flags!(parse_string)
    end
  end
end

#dump ⇒ Object

Print the Environment's construction variables for debugging.



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# File 'lib/rscons/basic_environment.rb', line 211

def dump
  varset_hash = @varset.to_h
  varset_hash.keys.sort_by(&:to_s).each do |var|
    var_str = var.is_a?(Symbol) ? var.inspect : var
    Ansi.write($stdout, :cyan, var_str, :reset, " => #{varset_hash[var].inspect}\n")
  end
end

#expand_varref(varref, extra_vars = nil) ⇒ nil, ... Also known as: build_command

Expand a construction variable reference.

Parameters:

  • varref (nil, String, Array, Proc, Symbol, TrueClass, FalseClass) —

    Variable reference to expand.

  • extra_vars (Hash, VarSet) (defaults to: nil) —

    Extra variables to use in addition to (or replace) the Environment's construction variables when expanding the variable reference.

Returns:

  • (nil, String, Array, Symbol, TrueClass, FalseClass) —

    Expansion of the variable reference.



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# File 'lib/rscons/basic_environment.rb', line 72

def expand_varref(varref, extra_vars = nil)
  vars =
    if extra_vars.nil?
      @varset
    else
      @varset.merge(extra_vars)
    end
  lambda_args = [env: self, vars: vars]
  vars.expand_varref(varref, lambda_args)
end

#get_var(key) ⇒ Object

Access the value of a construction variable.

This method is similar to #[] but does not make a copy-on-access copy of the variable accessed. This means that the returned value is NOT safe to be modified by the caller. Thus the caller must guarantee that it does not modify the returned value.

Parameters:

  • key (String, Symbol) —

    The construction variable name.

Returns:

  • (Object) —

    The construction variable's value.



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# File 'lib/rscons/basic_environment.rb', line 40

def get_var(key)
  @varset.get_var(key)
end

#load_configuration_data!(options) ⇒ Object

Load all construction variables saved from the configure operation.



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# File 'lib/rscons/basic_environment.rb', line 220

def load_configuration_data!(options)
  if vars = Cache.instance["configuration_data"]["vars"]
    if default_vars = vars["_default_"]
      apply_configuration_data!(default_vars)
    end
    if options[:use]
      Array(options[:use]).each do |use|
        if use_vars = vars[use]
          apply_configuration_data!(use_vars)
        end
      end
    end
  end
end

#merge_flags(flags) ⇒ void

This method returns an undefined value.

Merge construction variable flags into this Environment's construction variables.

This method does the same thing as #append, except that Array values in flags are appended to the end of Array construction variables instead of replacing their contents.

Parameters:

  • flags (Hash) —

    Set of construction variables to merge into the current Environment. This can be the value (or a modified version) returned by #parse_flags.



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# File 'lib/rscons/basic_environment.rb', line 200

def merge_flags(flags)
  flags.each_pair do |key, val|
    if self.get_var(key).is_a?(Array) and val.is_a?(Array)
      self[key] += val
    else
      self[key] = val
    end
  end
end

#parse_flags(flags) ⇒ Hash

Parse command-line flags for compilation/linking options into separate construction variables.

For #parse_flags, the parsed construction variables are returned in a Hash instead of merging them directly to the Environment. They can be merged with #merge_flags. The #parse_flags! version immediately merges the parsed flags as well.

Example:

# Import FreeType build options
env.parse_flags!("!freetype-config --cflags --libs")

Parameters:

  • flags (String) —

    String containing the flags to parse, or if the flags string begins with “!”, a shell command to execute using #shell to obtain the flags to parse.

Returns:

  • (Hash) —

    Set of construction variables to append.



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# File 'lib/rscons/basic_environment.rb', line 105

def parse_flags(flags)
  if flags =~ /^!(.*)$/
    flags = shell($1)
  end
  rv = {}
  words = Shellwords.split(flags)
  skip = false
  words.each_with_index do |word, i|
    if skip
      skip = false
      next
    end
    append = lambda do |var, val|
      rv[var] ||= []
      rv[var] += val
    end
    handle = lambda do |var, val|
      if val.nil? or val.empty?
        val = words[i + 1]
        skip = true
      end
      if val and not val.empty?
        append[var, [val]]
      end
    end
    if word == "-arch"
      if val = words[i + 1]
        append["CCFLAGS", ["-arch", val]]
        append["LDFLAGS", ["-arch", val]]
      end
      skip = true
    elsif word =~ /^#{get_var("CPPDEFPREFIX")}(.*)$/
      handle["CPPDEFINES", $1]
    elsif word == "-include"
      if val = words[i + 1]
        append["CCFLAGS", ["-include", val]]
      end
      skip = true
    elsif word == "-isysroot"
      if val = words[i + 1]
        append["CCFLAGS", ["-isysroot", val]]
        append["LDFLAGS", ["-isysroot", val]]
      end
      skip = true
    elsif word =~ /^#{get_var("INCPREFIX")}(.*)$/
      handle["CPPPATH", $1]
    elsif word =~ /^#{get_var("LIBLINKPREFIX")}(.*)$/
      handle["LIBS", $1]
    elsif word =~ /^#{get_var("LIBDIRPREFIX")}(.*)$/
      handle["LIBPATH", $1]
    elsif word == "-mno-cygwin"
      append["CCFLAGS", [word]]
      append["LDFLAGS", [word]]
    elsif word == "-mwindows"
      append["LDFLAGS", [word]]
    elsif word == "-pthread"
      append["CCFLAGS", [word]]
      append["LDFLAGS", [word]]
    elsif word =~ /^-Wa,(.*)$/
      append["ASFLAGS", $1.split(",")]
    elsif word =~ /^-Wl,(.*)$/
      append["LDFLAGS", $1.split(",")]
    elsif word =~ /^-Wp,(.*)$/
      append["CPPFLAGS", $1.split(",")]
    elsif word.start_with?("-")
      append["CCFLAGS", [word]]
    elsif word.start_with?("+")
      append["CCFLAGS", [word]]
      append["LDFLAGS", [word]]
    else
      append["LIBS", [word]]
    end
  end
  rv
end

#parse_flags!(flags) ⇒ Hash

Parse command-line flags for compilation/linking options into separate construction variables.

For #parse_flags, the parsed construction variables are returned in a Hash instead of merging them directly to the Environment. They can be merged with #merge_flags. The #parse_flags! version immediately merges the parsed flags as well.

Example:

# Import FreeType build options
env.parse_flags!("!freetype-config --cflags --libs")

Parameters:

  • flags (String) —

    String containing the flags to parse, or if the flags string begins with “!”, a shell command to execute using #shell to obtain the flags to parse.

Returns:

  • (Hash) —

    Set of construction variables to append.



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# File 'lib/rscons/basic_environment.rb', line 105

def parse_flags(flags)
  if flags =~ /^!(.*)$/
    flags = shell($1)
  end
  rv = {}
  words = Shellwords.split(flags)
  skip = false
  words.each_with_index do |word, i|
    if skip
      skip = false
      next
    end
    append = lambda do |var, val|
      rv[var] ||= []
      rv[var] += val
    end
    handle = lambda do |var, val|
      if val.nil? or val.empty?
        val = words[i + 1]
        skip = true
      end
      if val and not val.empty?
        append[var, [val]]
      end
    end
    if word == "-arch"
      if val = words[i + 1]
        append["CCFLAGS", ["-arch", val]]
        append["LDFLAGS", ["-arch", val]]
      end
      skip = true
    elsif word =~ /^#{get_var("CPPDEFPREFIX")}(.*)$/
      handle["CPPDEFINES", $1]
    elsif word == "-include"
      if val = words[i + 1]
        append["CCFLAGS", ["-include", val]]
      end
      skip = true
    elsif word == "-isysroot"
      if val = words[i + 1]
        append["CCFLAGS", ["-isysroot", val]]
        append["LDFLAGS", ["-isysroot", val]]
      end
      skip = true
    elsif word =~ /^#{get_var("INCPREFIX")}(.*)$/
      handle["CPPPATH", $1]
    elsif word =~ /^#{get_var("LIBLINKPREFIX")}(.*)$/
      handle["LIBS", $1]
    elsif word =~ /^#{get_var("LIBDIRPREFIX")}(.*)$/
      handle["LIBPATH", $1]
    elsif word == "-mno-cygwin"
      append["CCFLAGS", [word]]
      append["LDFLAGS", [word]]
    elsif word == "-mwindows"
      append["LDFLAGS", [word]]
    elsif word == "-pthread"
      append["CCFLAGS", [word]]
      append["LDFLAGS", [word]]
    elsif word =~ /^-Wa,(.*)$/
      append["ASFLAGS", $1.split(",")]
    elsif word =~ /^-Wl,(.*)$/
      append["LDFLAGS", $1.split(",")]
    elsif word =~ /^-Wp,(.*)$/
      append["CPPFLAGS", $1.split(",")]
    elsif word.start_with?("-")
      append["CCFLAGS", [word]]
    elsif word.start_with?("+")
      append["CCFLAGS", [word]]
      append["LDFLAGS", [word]]
    else
      append["LIBS", [word]]
    end
  end
  rv
end

#shell(command) ⇒ String

Execute a command using the system shell.

The shell is automatically determined but can be overridden by the SHELL construction variable. If the SHELL construction variable is specified, the flag to pass to the shell is automatically dtermined but can be overridden by the SHELLFLAG construction variable.

Parameters:

  • command (String) —

    Command to execute.

Returns:

  • (String) —

    The command's standard output.



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# File 'lib/rscons/basic_environment.rb', line 261

def shell(command)
  shell_cmd =
    if shell = get_var("SHELL")
      flag = get_var("SHELLFLAG") || (shell == "cmd" ? "/c" : "-c")
      [shell, flag]
    else
      Rscons.get_system_shell
    end
  IO.popen([*shell_cmd, command]) do |io|
    io.read
  end
end