Class: Eggshell::Processor

Inherits:
Object
  • Object
show all
Defined in:
lib/eggshell/processor.rb

Constant Summary collapse

BLOCK_MATCH = 
/^([a-z0-9_-]+\.)/
BLOCK_MATCH_PARAMS = 
/^([a-z0-9_-]+)\(/
TAB = 
"\t"
TAB_SPACE = 
'    '
BH = 
Eggshell::BlockHandler
COMMENT = 
'#!'
DIRECTIVE = 
'#>'
PIPE_INLINE =

This string in a block indicates that a piped macro’s output should be inserted at this location rather than immediately after last line. For now, this is only checked for on the last line.

Multiple inline pipes can be specified on this line, with each pipe corresponding to each macro chained to the block. Any unfilled pipe will be replaced with a blank string.

To escape the pipe, use a backslash anywhere [AFTER] the initial dash (e.g. ‘-\>*<-`).

'->*<-'
BACKSLASH_REGEX = 
/\\(u[0-9a-f]{4}|u\{[^}]+\}|.)/i
BACKSLASH_UNESCAPE_MAP = 
{
  'f' => "\f",
  'n' => "\n",
  'r' => "\r",
  't' => "\t",
  'v' => "\v"
}.freeze

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Processor

Returns a new instance of Processor.



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# File 'lib/eggshell/processor.rb', line 6

def initialize
  @context = Eggshell::ProcessorContext.new
  @vars = @context.vars
  @funcs = @context.funcs
  @macros = @context.macros
  @blocks = @context.blocks
  @blocks_map = @context.blocks_map
  @block_params = @context.block_params
  @expr_cache = @context.expr_cache
  @fmt_handlers = @context.fmt_handlers
  @ee = Eggshell::ExpressionEvaluator.new(@vars, @funcs)

  @noop_macro = Eggshell::MacroHandler::Defaults::NoOpHandler.new
  @noop_block = Eggshell::BlockHandler::Defaults::NoOpHandler.new
end

Instance Attribute Details

#context ⇒ Object (readonly)

Returns the value of attribute context.



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# File 'lib/eggshell/processor.rb', line 22

def context
  @context
end

#vars ⇒ Object (readonly)

Returns the value of attribute vars.



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# File 'lib/eggshell/processor.rb', line 90

def vars
  @vars
end

Class Method Details

.parse_block_start(line) ⇒ Object 



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# File 'lib/eggshell/processor.rb', line 615

def self.parse_block_start(line)
  block_type = nil
  args = []

  bt = line.match(BLOCK_MATCH_PARAMS)
  if bt
    idx0 = bt[0].length
    idx1 = line.index(').', idx0)
    if idx1
      block_type = line[0..idx0-2]
      params = line[0...idx1+1].strip
      line = line[idx1+2..line.length] || ''
      if params != ''
        struct = ExpressionEvaluator.struct(params)
        args = struct[0][2]
      end
    end
  else
    block_type = line.match(BLOCK_MATCH)
    if block_type && block_type[0].strip != ''
      block_type = block_type[1]
      len = block_type.length
      block_type = block_type[0..-2] if block_type[-1] == '.'
      line = line[len..line.length] || ''
    else
      block_type = nil
    end
  end
  
  [block_type, args, line]
end

.parse_macro_start(line) ⇒ Object 



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# File 'lib/eggshell/processor.rb', line 647

def self.parse_macro_start(line)
  macro = nil
  args = []
  delim = nil

  # either macro is a plain '@macro' or it has parameters/opening brace
  if line.index(' ') || line.index('(') || line.index('{')
    # since the macro statement is essentially a function call, parse the line as an expression to get components
    expr_struct = ExpressionEvaluator.struct(line)
    fn = expr_struct.shift
    if fn.is_a?(Array) && (fn[0] == :fn || fn[0] == :var)
      macro = fn[1][1..fn[1].length]
      args = fn[2]
      if expr_struct[-1].is_a?(Array) && expr_struct[-1][0] == :brace_op
        delim = expr_struct[-1][1]
      end
    end
  else
    macro = line[1..line.length]
  end
  
  [macro, args, delim]
end

.unescape(str) ⇒ Object

Unescapes backslashes and Unicode characters.

If a match is made against {BACKSLASH_UNESCAPE_MAP} that character will be used, otherwise, the literal is used.

Unicode sequences are standard Ruby-like syntax: {uabcd} or seq2 …}}.



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# File 'lib/eggshell/processor.rb', line 686

def self.unescape(str)
  str = str.gsub(BACKSLASH_REGEX) do |match|
    if match.length == 2
      c = match[1]
      BACKSLASH_UNESCAPE_MAP[c] || c
    else
      if match[2] == '{'
        parts = match[3..-1].split(' ')
        buff = ''
        parts.each do |part|
          buff += [part.to_i(16)].pack('U')
        end
        buff
      else
        [match[2..-1].to_i(16)].pack('U')
      end
    end
  end
end

Instance Method Details

#_debug(msg) ⇒ Object 



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# File 'lib/eggshell/processor.rb', line 80

def _debug(msg)
  return if @vars['log.level'] < 2
  $stderr.write("[DEBUG] #{msg}\n")
end

#_error(msg) ⇒ Object 



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# File 'lib/eggshell/processor.rb', line 67

def _error(msg)
  $stderr.write("[ERROR] #{msg}\n")
end

#_info(msg) ⇒ Object 



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# File 'lib/eggshell/processor.rb', line 75

def _info(msg)
  return if @vars['log.level'] < 1
  $stderr.write("[INFO]  #{msg}\n")
end

#_trace(msg) ⇒ Object 



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# File 'lib/eggshell/processor.rb', line 85

def _trace(msg)
  return if @vars['log.level'] < 3
  $stderr.write("[TRACE] #{msg}\n")
end

#_warn(msg) ⇒ Object 



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# File 'lib/eggshell/processor.rb', line 71

def _warn(msg)
  $stderr.write("[WARN]  #{msg}\n")
end

#add_block_handler(handler, *names) ⇒ Object 



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# File 'lib/eggshell/processor.rb', line 24

def add_block_handler(handler, *names)
  _trace "add_block_handler: #{names.inspect} -> #{handler.class}"
  @blocks << handler
  names.each do |name|
    @blocks_map[name] = handler
  end
end

#add_format_handler(handler, tags) ⇒ Object

TODO:

if opening tag is regex, don’t escape (but make sure it doesn’t contain {^} or {$})

Register inline format handlers with opening and closing tags. Typically, tags can be arbitrarily nested. However, nesting can be shut off completely or selectively by specifying 0 or more tags separated by a space (empty string is completely disabled).

following form: close[, non_nest]]}

Parameters:

  • Array —

    tags Each entry should be a 2- or 3-element array in the



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# File 'lib/eggshell/processor.rb', line 536

def add_format_handler(handler, tags)
  return if !tags.is_a?(Array)
  
  tags.each do |entry|
    open, close, no_nest = entry
    no_nest = '' if no_nest.is_a?(TrueClass)
    @fmt_handlers[open] = [handler, close, no_nest]
    _trace "add_format_handler: #{open} #{close} (non-nested: #{no_nest.inspect})"
  end

  # regenerate splitting pattern going from longest to shortest
  openers = @fmt_handlers.keys.sort do |a, b|
    b.length <=> a.length
  end

  regex = ''
  openers.each do |op|
    regex = "#{regex}|#{Regexp.quote(op)}|#{Regexp.quote(@fmt_handlers[op][1])}"
  end

  @fmt_regex = /(\\|'|"#{regex})/
end

#add_macro_handler(handler, *names) ⇒ Object 



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# File 'lib/eggshell/processor.rb', line 40

def add_macro_handler(handler, *names)
  _trace "add_macro_handler: #{names.inspect} -> #{handler.class}"
  names.each do |name|
    @macros[name] = handler
  end
end

#assemble(parse_tree, call_depth = 0, opts = {}) ⇒ Object

Goes through each item in parse tree, collecting output in the following manner:

# {String}s and {Line}s are outputted as-is # macros and blocks with matching handlers get {process} called

All output is joined with ‘\n` by default.

The output object and join string can be overridden through the {opts} parameter keys {:out} and {:joiner}. 3

Parameters:

  • Eggshell::ParseTree,Array —

    parse_tree Parsed document.

  • Integer —

    call_depth

  • Hash —

    opts

Raises:

  • (Exception) 


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# File 'lib/eggshell/processor.rb', line 414

def assemble(parse_tree, call_depth = 0, opts = {})
  opts = {} if !opts.is_a?(Hash)
  out = opts[:out] || get_out
  joiner = opts[:join] || "\n"

  parse_tree = parse_tree.tree if parse_tree.is_a?(Eggshell::ParseTree)
  raise Exception.new("input not an array or ParseTree (depth=#{call_depth}") if !parse_tree.is_a?(Array)
  # @todo defer process to next unit so macro can inject lines back into previous block
  
  last_type = nil
  last_line = 0
  deferred = nil

  parse_tree.each do |unit|
    if unit.is_a?(String)
      out << unit
      last_line += 1
      last_type = nil
    elsif unit.is_a?(Eggshell::Line)
      out << unit.to_s
      last_line = unit.line_nameum
      last_type = nil
    elsif unit.is_a?(Array)
      handler = unit[0] == :block ? @blocks_map[unit[1]] : @macros[unit[1]]
      name = unit[1]

      if !handler
        _warn "handler not found: #{unit[0]} -> #{unit[1]}"
        next
      end

      args_o = unit[2] || []
      args = []
      args_o.each do |arg|
        args << expr_eval(arg)
      end
        
      lines = unit[ParseTree::IDX_LINES]
      lines_start = unit[ParseTree::IDX_LINES_START]
      lines_end = unit[ParseTree::IDX_LINES_END]

      _handler, _name, _args, _lines = deferred

      if unit[0] == :block
        if deferred
          # two cases:
          # 1. this block is immediately tied to block-macro chain and is continuation of same type of block
          # 2. part of block-macro chain but not same type, or immediately follows another block
          if last_type == :macro && (lines_start - last_line <= 1) && _handler.equal?(handler, name)
            lines.each do |line|
              _lines << line
            end
          else
            _handler.process(_name, _args, _lines, out, call_depth)
            deferred = [handler, name, args, lines.clone]
          end
        else
          deferred = [handler, name, args, lines.clone]
        end

        last_line = lines_end
      else
        # macro immediately after a block, so assume that output gets piped into last lines
        # of closest block
        if deferred && lines_start - last_line == 1
          _last = _lines[-1]
          pinline = false
          pipe = _lines
          if _last.to_s.index(PIPE_INLINE)
            pipe = []
            pinline = true
          end

          handler.process(name, args, lines, pipe, call_depth)

          # inline pipe; join output with literal \n to avoid processing lines in block process
          if pinline
            if _last.is_a?(Eggshell::Line)
              _lines[-1] = _last.replace(_last.line.sub(PIPE_INLINE, pipe.join('\n')))
            else
              _lines[-1] = _last.sub(PIPE_INLINE, pipe.join('\n'))
            end
          end
        else
          if deferred
            _handler.process(_name, _args, _lines, out, call_depth)
            deferred = nil
          end
          handler.process(name, args, lines, out, call_depth)
        end
        last_line = lines_end
      end

      last_type = unit[0]
    elsif unit
      _warn "not sure how to handle #{unit.class}"
      _debug unit.inspect
      last_type = nil
    end
  end

  if deferred
    _handler, _name, _args, _lines = deferred
    _handler.process(_name, _args, _lines, out, call_depth)
    deferred = nil
  end
  out.join(joiner)
end

#expand_all(str) ⇒ Object

Calls inline formatting, expression extrapolator, and backslash unescape.



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# File 'lib/eggshell/processor.rb', line 711

def expand_all(str)
  unescape(expand_expr(expand_formatting(str)))
end

#expand_expr(expr) ⇒ Object

TODO:

deprecate @@macro@@?

Expands expressions (‘${}`) and macro calls (`@@macro@@`).



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# File 'lib/eggshell/processor.rb', line 98

def expand_expr(expr)
  # replace dynamic placeholders
  # @todo expand to actual expressions
  buff = []
  esc = false
  exp = false
  mac = false

  toks = expr.split(/(\\|\$\{|\}|@@|"|')/)
  i = 0

  plain_str = ''
  expr_str = ''
  quote = nil
  expr_delim = nil

  while i < toks.length
    tok = toks[i]
    i += 1
    next if tok == ''

    if esc
      plain_str += '\\' + tok
      esc = false
      next
    end

    if exp
      if quote
        expr_str += tok
        if tok == quote
          quote = nil
        end
      elsif tok == '"' || tok == "'"
        expr_str += tok
        quote = tok
      elsif tok == expr_delim
        struct = @expr_cache[expr_str]

        if !struct
          struct = Eggshell::ExpressionEvaluator.struct(expr_str)
          @expr_cache[expr_str] = struct
        end

        if !mac
          buff << expr_eval(struct)
        else
          args = struct[0]
          macro = args[1]
          args = args[2] || []
          macro_handler = @macros[macro]
          if macro_handler
            macro_handler.process(buff, macro, args, nil, -1)
          else
            _warn("macro (inline) not found: #{macro}")
          end
        end

        exp = false
        mac = false
        expr_delim = nil
        expr_str = ''
      else
        expr_str += tok
      end
    # only unescape if not in expression, since expression needs to be given as-is
    elsif tok == '\\'
      esc = true
      next
    elsif tok == '${' || tok == '@@'
      if plain_str != ''
        buff << plain_str
        plain_str = ''
      end
      exp = true
      expr_delim = '}'
      if tok == '@@'
        mac = true
        expr_delim = tok
      end
    else
      plain_str += tok
    end
  end

  # if exp -- throw exception?
  buff << plain_str if plain_str != ''
  return buff.join('')
end

#expand_formatting(str) ⇒ Object

Expands inline formatting with Eggshell::Processor.{Eggshell{Eggshell::FormatHandler}s.



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# File 'lib/eggshell/processor.rb', line 560

def expand_formatting(str)
  toks = str.gsub(PIPE_INLINE, '').split(@fmt_regex)
  toks.delete('')

  buff = ['']
  quote = nil
  opened = []
  closing = []
  non_nesting = []

  i = 0
  while i < toks.length
    tok = toks[i]
    i += 1
    if tok == '\\'
      # preserve escape char otherwise we lose things like \n or \t
      buff[-1] += tok + toks[i]
      i += 1
    elsif quote
      quote = nil if tok == quote
      buff[-1] += tok
    elsif tok == '"' || tok == "'"
      # only open quote if there's whitespace or blank string preceeding it
      quote = tok if opened[-1] && (!buff[-1] || buff[-1] == '' || buff[-1].match(/\s$/))
      buff[-1] += tok
    elsif @fmt_handlers[tok] && (!non_nesting[-1] || non_nesting.index(tok))
      handler, closer, non_nest = @fmt_handlers[tok]
      opened << tok
      closing << closer
      non_nesting << non_nest
      buff << ''
    elsif tok == closing[-1]
      opener = opened.pop
      handler = @fmt_handlers[opener][0]
      closing.pop
      non_nesting.pop

      # @todo insert placeholder and swap out at end? might be a prob if value has to be escaped
      bstr = buff.pop
      buff[-1] += handler.format(opener, bstr)
    else
      buff[-1] += tok
    end
  end

  opened.each do |op|
    bstr = buff.pop
    buff[-1] += op + bstr
    _warn "expand_formatting: unclosed #{op}, not doing anything: #{bstr}"
    #_warn toks.inspect
  end

  buff.join('')
end

#expr_eval(struct) ⇒ Object 



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# File 'lib/eggshell/processor.rb', line 92

def expr_eval(struct)
  return Eggshell::ExpressionEvaluator.expr_eval(struct, @vars, @funcs)
end

#get_block_params(block_type) ⇒ Object

Gets the block parameters for a block type, and merges default values if available.



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# File 'lib/eggshell/processor.rb', line 204

def get_block_params(block_type)
  bp = @block_params.delete(:pending)
  if @block_params_default
    if block_type && bp
      @block_params[block_type] = bp if bp
    end
    @block_params_default = false
    bp = {} if !bp
  else
    bp = {} if !bp
    default = @block_params[block_type]
    if default
      default.each do |key,val|
        if !bp.has_key?(key) && val
          bp[key] = val.clone
        end
      end
    end
  end
  return bp
end

#get_out ⇒ Object 



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# File 'lib/eggshell/processor.rb', line 233

def get_out
  if !@out
    []
  elsif @out.is_a?(Class)
    @out.new
  else
    @out
  end
end

#preprocess(lines, line_count = 0) ⇒ Object 



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# File 'lib/eggshell/processor.rb', line 248

def preprocess(lines, line_count = 0)
  line_start = line_count
  line_buff = nil
  indent = 0
  mode = nil
  
  in_html = false
  end_html = nil
  
  parse_tree = Eggshell::ParseTree.new

  """
  algorithm for normalizing lines:
  
  - skip comments (process directive if present)
  - if line is continuation, set current line = last + current
  - if line ends in \ and is not blank otherwise, set new continuation and move to next line
  - if line ends in \ and is effectively blank, append '\n'
  - calculate indent level
  """
  i = 0
  begin
    while i < lines.length
      oline = lines[i]
      i += 1

      line_count += 1

      hdr = oline.lstrip[0..1]
      if hdr == COMMENT
        next
      end

      line = oline.chomp
      line_end = oline[line.length..-1]
      if line_buff
        line_buff += line
        line = line_buff
        line_buff = nil
      else
        line_start += 1
      end
      
      _hard_return = false

      # if line ends in a single \, either insert hard return into current block (with \n)
      # or init line_buff to collect next line
      if line[-1] == '\\'
        if line[-2] != '\\'
          nline = line[0...-1]
          # check if line is effectively blank, but add leading whitespace back
          # to maintain tab processing
          if nline.strip == ''
            line = "#{nline}\n"
            line_end = ''
            _hard_return = true
          else
            line_buff = nline
            next
          end
        end
      end

      # detect tabs (must be consistent per-line)
      _ind = 0
      tab_str = line[0] == TAB ? TAB : nil
      tab_str = line.index(TAB_SPACE) == 0 ? TAB_SPACE : nil if !tab_str
      indent_str = ''
      if tab_str
        _ind += 1
        _len = tab_str.length
        _pos = _len
        while line.index(tab_str, _pos)
          _pos += _len
          _ind += 1
        end
        line = line[_pos..-1]

        # trim indent chars based on block_handler_indent
        if indent > 0
          _ind -= indent
          _ind = 0 if _ind < 0
        end
      end
      
      line_norm = Line.new(line, tab_str, _ind, line_start, oline.chomp)
      line_start = line_count

      if parse_tree.mode == :raw
        stat = parse_tree.collect(line_norm)
        next if stat != BH::RETRY
        parse_tree.push_block
      end

      # macro processing
      if line[0] == '@'
        parse_tree.new_macro(line_norm, line_count)
        next
      elsif parse_tree.macro_delim_match(line_norm, line_count)
        next
      end

      if parse_tree.mode == :block
        stat = parse_tree.collect(line_norm)
        if stat == BH::RETRY
          parse_tree.push_block
        else
          next
        end
      end

      # blank line and not in block
      if line == ''
        parse_tree.push_block
        next
      end

      found = false
      @blocks.each do |handler|
        stat = handler.can_handle(line)
        next if stat == BH::RETRY
        
        parse_tree.new_block(handler, handler.current_type, line_norm, stat, line_count)
        found = true
        _trace "(#{handler.current_type}->#{handler}) #{line} -> #{stat}"
        break
      end

      if !found
        @blocks_map['p'].can_handle('p.')
        parse_tree.new_block(@blocks_map['p'], 'p', line_norm, BH::COLLECT, line_count)
      end
    end
    parse_tree.push_block
    # @todo check if macros left open
  rescue => ex
    _error "Exception approximately on line: #{line}"
    _error ex.message + "\t#{ex.backtrace.join("\n\t")}"
    #_error "vars = #{@vars.inspect}"
  end
  
  parse_tree
end

#process(lines, line_count = 0, call_depth = 0) ⇒ Object 



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# File 'lib/eggshell/processor.rb', line 523

def process(lines, line_count = 0, call_depth = 0)
  parse_tree = preprocess(lines, line_count)
  assemble(parse_tree.tree, call_depth)
end

#register_functions(func_key, handler, func_names = nil) ⇒ Object

Registers a function for embedded expressions. Functions are grouped into namespaces, and a handler can be assigned to handle all function calls within that namespace, or a specific set of functions within the namespace. The root namespace is a blank string.

root namespace, do :func_name. needs to only handle a subset of functions, supply the list of function names here.

Parameters:

  • String —

    func_key In the form ns or ns:func_name. For functions in the

  • Object —

    handler

  • Array —

    func_names If func_key only refers to a namespace but the handler



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# File 'lib/eggshell/processor.rb', line 63

def register_functions(func_key, handler, func_names = nil)
  @ee.register_functions(func_key, handler, func_names)
end

#rem_block_handler(*names) ⇒ Object 



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# File 'lib/eggshell/processor.rb', line 32

def rem_block_handler(*names)
  _trace "rem_block_handler: #{names.inspect}"
  names.each do |name|
    handler = @blocks_map.delete(name)
    @blocks.delete(handler)
  end
end

#rem_macro_handler(*names) ⇒ Object 



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# File 'lib/eggshell/processor.rb', line 47

def rem_macro_handler(*names)
  _trace "rem_macro_handler: #{names.inspect}"
  names.each do |name|
    @macros.delete(name)
  end
end

#set_block_params(params, is_default = false, block_type = nil) ⇒ Object

block_type used in ‘get_block_param()` or explicitly in third parameter.

Parameters:

  • Boolean —

    is_default If true, associates these parameters with the

  • String —

    block_type



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# File 'lib/eggshell/processor.rb', line 194

def set_block_params(params, is_default = false, block_type = nil)
  if block_type && is_default
    @block_params[block_type] = params
  else
    @block_params[:pending] = params
    @block_param_default = is_default
  end
end

#set_out(out) ⇒ Object

Sets the default output object. Must support {<<} and {join(String)}.

If {out} is a Class, must support empty initialization.



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# File 'lib/eggshell/processor.rb', line 229

def set_out(out)
  @out = out
end

#unescape(str) ⇒ Object 



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# File 'lib/eggshell/processor.rb', line 706

def unescape(str)
  return self.class.unescape(str)
end