Class: FormatEngine::SpecInfo

Inherits:
Object
  • Object
show all
Defined in:
lib/format_engine/spec_info.rb

Overview

A little package of info about the engine’s progress. In the context of a formatting / parsing block, the “self” of that block is an instance of SpecInfo.

The components of that instance Struct are:

When Formatting:

  • src - The object that is the source of the data.

  • dst - A string that receives the formatted output.

  • fmt - The format specification currently being processed.

  • engine - The formatting engine. Mostly for access to the library.

  • tmp - A utility hash so that the formatting process can retain state.


Methods

  • cat - Append the string that follows to the formatted output.



When Parsing:

  • src - A string that is the source of formatted input.

  • dst - The class of the object being created.

  • fmt - The parse specification currently being processed.

  • engine - The parsing engine. Mostly for access to the library.

  • tmp - A utility hash so that the parsing process can retain state.


Methods

  • set - Set the return value of the parsing operation to the value that follows.

  • parse - Look for the string or regex parm that follows. Return the data found or nil.

  • parse! - Like parse but raises an exception (with optional msg) if not found.

  • found? - Did the last parse succeed?

  • found - The text found by the last parse (or parse!) operation.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(src, dst, fmt, engine, tmp = {}) ⇒ SpecInfo

Set up the spec info.



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# File 'lib/format_engine/spec_info.rb', line 39

def initialize(src, dst, fmt, engine, tmp = {})
  @src, @dst, @fmt, @engine, @tmp = src, dst, fmt, engine, tmp
end

Instance Attribute Details

#dst ⇒ Object (readonly)

General readers



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# File 'lib/format_engine/spec_info.rb', line 33

def dst
  @dst
end

#engine ⇒ Object (readonly)

General readers



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# File 'lib/format_engine/spec_info.rb', line 33

def engine
  @engine
end

#fmt ⇒ Object

General accessors



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# File 'lib/format_engine/spec_info.rb', line 36

def fmt
  @fmt
end

#src ⇒ Object (readonly)

General readers



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# File 'lib/format_engine/spec_info.rb', line 33

def src
  @src
end

#tmp ⇒ Object (readonly)

General readers



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# File 'lib/format_engine/spec_info.rb', line 33

def tmp
  @tmp
end

Instance Method Details

#cat(str) ⇒ Object

Concatenate onto the formatted output string.



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# File 'lib/format_engine/spec_info.rb', line 44

def cat(str)
  @dst << str
end

#found ⇒ Object

What was found by the last parse?



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# File 'lib/format_engine/spec_info.rb', line 77

def found
  @result[1]
end

#found? ⇒ Boolean

Was the last parse a success?



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# File 'lib/format_engine/spec_info.rb', line 72

def found?
   @result[0].empty? && !@result[1].empty?
end

#parse(tgt) ⇒ Object

Parse the source string for a string or regex



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# File 'lib/format_engine/spec_info.rb', line 54

def parse(tgt)
  @result = src.partition(tgt)

  if found?
    @src = @result[2]
    @result[1]
  else
    nil
  end
end

#parse!(tgt, msg = "#{tgt.inspect} not found") ⇒ Object

Parse the source string for a string or regex or raise error.



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# File 'lib/format_engine/spec_info.rb', line 66

def parse!(tgt, msg = "#{tgt.inspect} not found")
  fail "Parse error: #{msg}" unless parse(tgt)
  found
end

#set(obj) ⇒ Object

Set the result of this parsing operation.



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# File 'lib/format_engine/spec_info.rb', line 49

def set(obj)
  @dst = obj
end