class Symbol
Extends the symbol class for auto declaration of input or output.
Constants
- High
High-level libraries for describing digital hardware.
Public Instance Methods
to_hdr()
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Convert to the equivalent HDLRuby
object if any, returns nil if not.
# File lib/HDLRuby/hruby_low2sym.rb, line 49 def to_hdr return Low2Symbol::Symbol2LowTable[self] end
to_value()
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Converts to a new value.
Returns nil if no value can be obtained from it.
# File lib/HDLRuby/hruby_high.rb, line 4556 def to_value str = self.to_s return nil if str[0] != "_" # Bit string are prefixed by "_" # Remove the "_" not needed any longer. str = str[1..-1] # Get and check the type type = str[0] if type == "0" or type == "1" or type == "z" or type == "Z" then # Default binary type = "b" else # Not a default type str = str[1..-1] end return nil if str.empty? return nil unless ["b","u","s"].include?(type) # Get the width if any. if str[0].match(/[0-9]/) then width = str.scan(/[0-9]*/)[0] else width = nil end # puts "width=#{width}" old_str = str # Save the string it this state since its first chars # can be erroneously considered as giving the width str = str[width.size..-1] if width # Get the base and the value base = str[0] # puts "base=#{base}\n" unless ["b", "o", "d", "h"].include?(base) then # No base found, default is bit base = "b" # And the width was actually a part of the value. value = old_str width = nil else # Get the value. value = str[1..-1] end # puts "value=#{value}" # Compute the bit width and the value case base when "b" then # base 2, compute the width width = width ? width.to_i : value.size # Check the value return nil unless value.match(/^[0-1zxZX]+$/) when "o" then # base 8, compute the width width = width ? width.to_i : value.size * 3 # Check the value if value.match(/^[0-7xXzZ]+$/) then # 4-state value, conpute the correspondig bit string. value = value.each_char.map do |c| c = c.upcase if c == "X" or c.upcase == "Z" then c * 3 else c.to_i(8).to_s(2).rjust(3,"0") end end.join else # Invalid value return nil end when "d" then # base 10, compute the width width = width ? width.to_i : value.to_i.to_s(2).size + 1 # Check the value return nil unless value.match(/^[0-9]+$/) # Compute it (base 10 values cannot be 4-state!) value = value.to_i.to_s(2) when "h" then # base 16, compute the width width = width ? width.to_i : value.size * 4 # Check the value if value.match(/^[0-9a-fA-FxXzZ]+$/) then # 4-state value, conpute the correspondig bit string. value = value.each_char.map do |c| c = c.upcase if c == "X" or c.upcase == "Z" then c * 4 else c.to_i(16).to_s(2).rjust(4,"0") end end.join else # Invalid value return nil end else # Unknown base return nil end # Compute the type. case type when "b" then type = bit[width] when "u" then type = unsigned[width] when "s" then type = signed[width] else # Unknown type return nil end # puts "type.width=#{type.width}, value=#{value}" # Create and return the value. return Value.new(type,value) end
Also aliased as: to_expr
to_value?()
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Tell if the expression can be converted to a value.
# File lib/HDLRuby/hruby_high.rb, line 4549 def to_value? return true end