Class: Eggshell::ParseTree

Inherits:
Object
  • Object
show all
Defined in:
lib/eggshell/parse-tree.rb

Overview

Holds a hierarchical collection of blocks and macros. The tree follows this structure:

pre. [ String*, [:block, ‘block_name’, [], line_start]* # last entry is array of Eggshell::Line, [:macro, ‘macro_name’, {}, [ __repeat_of_parse_tree ] ], line_start* ]

Constant Summary collapse

BH = 
Eggshell::BlockHandler
IDX_TYPE = 
0
IDX_NAME = 
1
IDX_ARGS = 
2
IDX_LINES = 
3
IDX_LINES_START = 
4
IDX_LINES_END = 
5

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ ParseTree

Returns a new instance of ParseTree.



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# File 'lib/eggshell/parse-tree.rb', line 22

def initialize
  #@eggshell = eggshell
  @modes = [:nil]
  @tree = []
  @lines = []
  @macro_delims = []
  @macro_open = []
  @macro_ptr = []
  @ptr = @tree
end

Class Method Details

.walk(struct = nil, indent = 0, out = nil) ⇒ Object

Does basic output of parse tree structure to visually inspect parsed info.



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# File 'lib/eggshell/parse-tree.rb', line 131

def self.walk(struct = nil, indent = 0, out = nil)
  out = $stdout if !out
  struct.each do |row|
    if row.is_a?(Eggshell::Line)
      out.write "#{'  '*indent}#{row.to_s.inspect} ##{row.line_num}\n"
    elsif row.is_a?(Array)
      if row[0] == :macro
        out.write "#{'  '*indent}@#{row[1]}(#{row[2].inspect}) | end=#{row[-1]}\n"
        walk(row[3], indent + 1, out)
      elsif row[0] == :block
        out.write "#{'  '*indent}#{row[1]}(#{row[2].inspect}) | end=#{row[-1]}\n"
        walk(row[3], indent + 1, out)
      end
    else
      out.write "#{'  '*indent}#{row.inspect} ?\n"
    end
  end
end

Instance Method Details

#collect(line_obj) ⇒ Object 



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# File 'lib/eggshell/parse-tree.rb', line 103

def collect(line_obj)
  more = @cur_block[0].continue_with(line_obj.line)
  if more != BH::RETRY
    @lines << line_obj
    if more == BH::DONE
      push_block
    end
  else
    push_block
  end
  more
end

#macro_delim_match(line_obj, line_num) ⇒ Object 



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# File 'lib/eggshell/parse-tree.rb', line 53

def macro_delim_match(line_obj, line_num)
  if @macro_delims[-1] == line_obj.line
    if @modes[-1] == :block
      push_block
    end
    @macro_delims.pop
    @macro_open.pop
    @ptr = @macro_ptr.pop
    @ptr[-1] << line_num
    last_mode = @modes.pop
    return true
  end
  return false
end

#mode ⇒ Object 



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# File 'lib/eggshell/parse-tree.rb', line 126

def mode
  @modes[-1]
end

#new_block(handler, type, line_obj, consume_mode, line_start) ⇒ Object 



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# File 'lib/eggshell/parse-tree.rb', line 68

def new_block(handler, type, line_obj, consume_mode, line_start)
  block_type, args, line = Eggshell::Processor.parse_block_start(line_obj.line)
  nline = Eggshell::Line.new(line, line_obj.tab_str, line_obj.indent_lvl, line_obj.line_num)

  if consume_mode != BH::DONE
    @modes << :block
    if line != ''
      @lines << nline
      line_start -= 1
    end
    @cur_block = [handler, type, args, line_start]
    if consume_mode == BH::COLLECT_RAW
      mode = :raw
    else consume_mode == BH::COLLECT
      mode = :block
    end
  else
    @ptr << [:block, type, args, [nline], line_start]
  end
end

#new_macro(line_obj, line_start) ⇒ Object 



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# File 'lib/eggshell/parse-tree.rb', line 33

def new_macro(line_obj, line_start)
  line = line_obj.line
  macro, args, delim = Eggshell::Processor.parse_macro_start(line)

  push_block

  if delim
    @modes << :macro
    @macro_delims << delim.reverse.gsub('[', ']').gsub('(', ')').gsub('{', '}')
    @macro_open << line
    @macro_ptr << @ptr
    # set ptr to entry's tree
    entry = [:macro, macro, args, [], line_start]
    @ptr << entry
    @ptr = entry[IDX_LINES]
  else
    @ptr << [:macro, macro, args, [], line_start]
  end
end

#push_block ⇒ Object 



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# File 'lib/eggshell/parse-tree.rb', line 89

def push_block
  if @modes[-1] == :block
    if @cur_block
      line_end = @cur_block[3]
      line_end = @lines[-1].line_num if @lines[-1]
      @ptr << [:block, @cur_block[1], @cur_block[2], @lines, @cur_block[3], line_end]
      @lines = []
      @cur_block[0].reset
      @cur_block = nil
    end
    @modes.pop
  end
end

#raw_line(line_obj) ⇒ Object 



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# File 'lib/eggshell/parse-tree.rb', line 116

def raw_line(line_obj)
  @ptr << line_obj
end

#tree ⇒ Object 



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# File 'lib/eggshell/parse-tree.rb', line 120

def tree
  @tree.clone
end