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 611

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 643

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 682

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 534

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
		elsif unit.is_a?(Eggshell::Line)
			out << unit.to_s
			last_line = unit.line_nameum
		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_end - last_line == 1) && _name == 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
		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 707

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 558

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 == "'"
			quote = tok if opened[-1]
			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}"
	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 521

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 702

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