Class: Hamlit::HamlParser

Inherits:
Object show all
Includes:
HamlUtil
Defined in:
lib/hamlit/parser/haml_parser.rb

Defined Under Namespace

Classes: Line, ParseNode

Constant Summary collapse

ELEMENT =

Designates an XHTML/XML element.

?%
DIV_CLASS =

Designates a `<div>` element with the given class.

?.
DIV_ID =

Designates a `<div>` element with the given id.

?#
COMMENT =

Designates an XHTML/XML comment.

?/
DOCTYPE =

Designates an XHTML doctype or script that is never HTML-escaped.

?!
SCRIPT =

Designates script, the result of which is output.

?=
SANITIZE =

Designates script that is always HTML-escaped.

?&
FLAT_SCRIPT =

Designates script, the result of which is flattened and output.

?~
SILENT_SCRIPT =

Designates script which is run but not output.

?-
SILENT_COMMENT =

When following SILENT_SCRIPT, designates a comment that is not output.

?#
ESCAPE =

Designates a non-parsed line.

?\\
FILTER =

Designates a block of filtered text.

?:
PLAIN_TEXT =

Designates a non-parsed line. Not actually a character.

-1
SPECIAL_CHARACTERS =

Keeps track of the ASCII values of the characters that begin a specially-interpreted line.

[
  ELEMENT,
  DIV_CLASS,
  DIV_ID,
  COMMENT,
  DOCTYPE,
  SCRIPT,
  SANITIZE,
  FLAT_SCRIPT,
  SILENT_SCRIPT,
  ESCAPE,
  FILTER
]
MULTILINE_CHAR_VALUE =

The value of the character that designates that a line is part of a multiline string.

?|
BLOCK_WITH_SPACES =

Regex to check for blocks with spaces around arguments. Not to be confused with multiline script. For example:

foo.each do | bar |
  = bar
/do\s*\|\s*[^\|]*\s+\|\z/
MID_BLOCK_KEYWORDS =
%w[else elsif rescue ensure end when]
START_BLOCK_KEYWORDS =
%w[if begin case unless]
START_BLOCK_KEYWORD_REGEX =

Try to parse assignments to block starters as best as possible

/(?:\w+(?:,\s*\w+)*\s*=\s*)?(#{START_BLOCK_KEYWORDS.join('|')})/
BLOCK_KEYWORD_REGEX =
/^-?\s*(?:(#{MID_BLOCK_KEYWORDS.join('|')})|#{START_BLOCK_KEYWORD_REGEX.source})\b/
DOCTYPE_REGEX =

The Regex that matches a Doctype command.

/(\d(?:\.\d)?)?\s*([a-z]*)\s*([^ ]+)?/i
LITERAL_VALUE_REGEX =

The Regex that matches a literal string or symbol value

/:(\w*)|(["'])((?!\\|\#\{|\#@|\#\$|\2).|\\.)*\2/
ID_KEY =
'id'.freeze
CLASS_KEY =
'class'.freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from HamlUtil

#check_encoding, #check_haml_encoding, #contains_interpolation?, #handle_interpolation, #html_safe, #human_indentation, #inspect_obj, #rails_xss_safe?, #silence_warnings, #slow_unescape_interpolation, #unescape_interpolation

Constructor Details

#initialize(template, options) ⇒ HamlParser


93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
# File 'lib/hamlit/parser/haml_parser.rb', line 93

def initialize(template, options)
  @options            = options
  # Record the indent levels of "if" statements to validate the subsequent
  # elsif and else statements are indented at the appropriate level.
  @script_level_stack = []
  @template_index     = 0
  @template_tabs      = 0

  match = template.rstrip.scan(/(([ \t]+)?(.*?))(?:\Z|\r\n|\r|\n)/m)
  # discard the last match which is always blank
  match.pop
  @template = match.each_with_index.map do |(full, whitespace, text), index|
    Line.new(whitespace, text.rstrip, full, index, self, false)
  end
  # Append special end-of-document marker
  @template << Line.new(nil, '-#', '-#', @template.size, self, true)
end

Instance Attribute Details

#rootObject (readonly)

Returns the value of attribute root


9
10
11
# File 'lib/hamlit/parser/haml_parser.rb', line 9

def root
  @root
end

Instance Method Details

#compute_tabs(line) ⇒ Object


154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
# File 'lib/hamlit/parser/haml_parser.rb', line 154

def compute_tabs(line)
  return 0 if line.text.empty? || !line.whitespace

  if @indentation.nil?
    @indentation = line.whitespace

    if @indentation.include?(?\s) && @indentation.include?(?\t)
      raise ::Hamlit::HamlSyntaxError.new(::Hamlit::HamlError.message(:cant_use_tabs_and_spaces), line.index)
    end

    @flat_spaces = @indentation * (@template_tabs+1) if flat?
    return 1
  end

  tabs = line.whitespace.length / @indentation.length
  return tabs if line.whitespace == @indentation * tabs
  return @template_tabs + 1 if flat? && line.whitespace =~ /^#{@flat_spaces}/

  message = ::Hamlit::HamlError.message(:inconsistent_indentation,
    human_indentation(line.whitespace),
    human_indentation(@indentation)
  )
  raise ::Hamlit::HamlSyntaxError.new(message, line.index)
end

#parseObject


111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
# File 'lib/hamlit/parser/haml_parser.rb', line 111

def parse
  @root = @parent = ParseNode.new(:root)
  @flat = false
  @filter_buffer = nil
  @indentation = nil
  @line = next_line

  raise ::Hamlit::HamlSyntaxError.new(::Hamlit::HamlError.message(:indenting_at_start), @line.index) if @line.tabs != 0

  loop do
    next_line

    process_indent(@line) unless @line.text.empty?

    if flat?
      text = @line.full.dup
      text = "" unless text.gsub!(/^#{@flat_spaces}/, '')
      @filter_buffer << "#{text}\n"
      @line = @next_line
      next
    end

    @tab_up = nil
    process_line(@line) unless @line.text.empty?
    if block_opened? || @tab_up
      @template_tabs += 1
      @parent = @parent.children.last
    end

    if !flat? && @next_line.tabs - @line.tabs > 1
      raise ::Hamlit::HamlSyntaxError.new(::Hamlit::HamlError.message(:deeper_indenting, @next_line.tabs - @line.tabs), @next_line.index)
    end

    @line = @next_line
  end
  # Close all the open tags
  close until @parent.type == :root
  @root
rescue ::Hamlit::HamlError => e
  e.backtrace.unshift "#{@options.filename}:#{(e.line ? e.line + 1 : @line.index + 1) + @options.line - 1}"
  raise
end