Class: Sass::Script::Parser

Inherits:
Object
  • Object
show all
Defined in:
lib/sass/script/parser.rb

Overview

The parser for SassScript. It parses a string of code into a tree of Nodes.

Direct Known Subclasses

CssParser

Constant Summary collapse

PRECEDENCE = 
[
  :comma, :single_eq, :concat, :or, :and,
  [:eq, :neq],
  [:gt, :gte, :lt, :lte],
  [:plus, :minus],
  [:times, :div, :mod],
]

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(str, line, offset, options = {}) ⇒ Parser

Returns a new instance of Parser.

Parameters:

  • str (String, StringScanner) —

    The source text to parse

  • line (Fixnum) —

    The line on which the SassScript appears. Used for error reporting

  • offset (Fixnum) —

    The number of characters in on which the SassScript appears. Used for error reporting

  • options ({Symbol => Object}) (defaults to: {}) —

    An options hash; see the Sass options documentation



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# File 'lib/sass/script/parser.rb', line 22

def initialize(str, line, offset, options = {})
  @options = options
  @lexer = lexer_class.new(str, line, offset, options)
end

Class Method Details

.parse(str, line, offset, filename = nil) ⇒ Script::Node

Parses a SassScript expression.

Returns:

See Also:



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# File 'lib/sass/script/parser.rb', line 119

def self.parse(*args)
  new(*args).parse
end

Instance Method Details

#line ⇒ Fixnum

The line number of the parser's current position.

Returns:

  • (Fixnum) 


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# File 'lib/sass/script/parser.rb', line 11

def line
  @lexer.line
end

#parse ⇒ Script::Node

Parses a SassScript expression.

Returns:

Raises:



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# File 'lib/sass/script/parser.rb', line 48

def parse
  expr = assert_expr :expr
  assert_done
  expr.options = @options
  expr
rescue Sass::SyntaxError => e
  e.modify_backtrace :line => @lexer.line, :filename => @options[:filename]
  raise e
end

#parse_interpolated ⇒ Script::Node

Parses a SassScript expression within an interpolated segment (#{}). This means that it stops when it comes across an unmatched }, which signals the end of an interpolated segment, it returns rather than throwing an error.

Returns:

Raises:



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# File 'lib/sass/script/parser.rb', line 34

def parse_interpolated
  expr = assert_expr :expr
  assert_tok :end_interpolation
  expr.options = @options
  expr
rescue Sass::SyntaxError => e
  e.modify_backtrace :line => @lexer.line, :filename => @options[:filename]
  raise e
end

#parse_mixin_definition_arglist ⇒ Array<Script::Node>

Parses the argument list for a mixin definition.

Returns:

  • (Array<Script::Node>) —

    The root nodes of the arguments.

Raises:



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# File 'lib/sass/script/parser.rb', line 99

def parse_mixin_definition_arglist
  args = defn_arglist!(false)
  assert_done

  args.each do |k, v|
    k.options = @options
    v.options = @options if v
  end
  args
rescue Sass::SyntaxError => e
  e.modify_backtrace :line => @lexer.line, :filename => @options[:filename]
  raise e
end

#parse_mixin_include_arglist ⇒ Array<Script::Node>

Parses the argument list for a mixin include.

Returns:

  • (Array<Script::Node>) —

    The root nodes of the arguments.

Raises:



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# File 'lib/sass/script/parser.rb', line 79

def parse_mixin_include_arglist
  args = []

  if try_tok(:lparen)
    args = arglist || args
    assert_tok(:rparen)
  end
  assert_done

  args.each {|a| a.options = @options}
  args
rescue Sass::SyntaxError => e
  e.modify_backtrace :line => @lexer.line, :filename => @options[:filename]
  raise e
end

#parse_until(tokens) ⇒ Script::Node

Parses a SassScript expression, ending it when it encounters one of the given identifier tokens.

Parameters:

  • A (#include?(String)) —

    set of strings that delimit the expression.

Returns:

Raises:



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# File 'lib/sass/script/parser.rb', line 64

def parse_until(tokens)
  @stop_at = tokens
  expr = assert_expr :expr
  assert_done
  expr.options = @options
  expr
rescue Sass::SyntaxError => e
  e.modify_backtrace :line => @lexer.line, :filename => @options[:filename]
  raise e
end