The lexical analyzer for SassScript. It takes a raw string and converts it to individual tokens that are easier to parse.
A sub-list of {OP_NAMES} that only includes operators with identifier names.
A hash from operator strings to the corresponding token types.
A list of operator strings ordered with longer names first so that `>` and `<` don’t clobber `>=` and `<=`.
A hash of regular expressions that are used for tokenizing.
A hash of regular expressions that are used for tokenizing strings.
The key is a `[Symbol, Boolean]` pair. The symbol represents which style of quotation to use, while the boolean represents whether or not the string is following an interpolated segment.
A struct containing information about an individual token.
`type`: [`Symbol`] : The type of token.
`value`: [`Object`] : The Ruby object corresponding to the value of the token.
`source_range`: [`Sass::Source::Range`] : The range in the source file in which the token appeared.
`pos`: [`Fixnum`] : The scanner position at which the SassScript token appeared.
@param str [String, StringScanner] The source text to lex @param line [Fixnum] The 1-based line on which the SassScript appears.
Used for error reporting and sourcemap building
@param offset [Fixnum] The 1-based character (not byte) offset in the line in the source.
Used for error reporting and sourcemap building
@param options [{Symbol => Object}] An options hash;
see {file:SASS_REFERENCE.md#sass_options the Sass options documentation}
# File lib/sass/script/lexer.rb, line 147 def initialize(str, line, offset, options) @scanner = str.is_a?(StringScanner) ? str : Sass::Util::MultibyteStringScanner.new(str) @line = line @offset = offset @options = options @interpolation_stack = [] @prev = nil end
@return [Boolean] Whether or not the last token lexed was `:end_interpolation`.
# File lib/sass/script/lexer.rb, line 202 def after_interpolation? @prev && @prev.type == :end_interpolation end
@return [Boolean] Whether or not there’s more source text to lex.
# File lib/sass/script/lexer.rb, line 196 def done? whitespace unless after_interpolation? && @interpolation_stack.last @scanner.eos? && @tok.nil? end
Raise an error to the effect that `name` was expected in the input stream and wasn’t found.
This calls {#unpeek!} to rewind the scanner to immediately after the last returned token.
@param name [String] The name of the entity that was expected but not found @raise [Sass::SyntaxError]
# File lib/sass/script/lexer.rb, line 214 def expected!(name) unpeek! Sass::SCSS::Parser.expected(@scanner, name, @line) end
The line number of the lexer’s current position.
@return [Fixnum]
# File lib/sass/script/lexer.rb, line 29 def line return @line unless @tok @tok.source_range.start_pos.line end
Moves the lexer forward one token.
@return [Token] The token that was moved past
# File lib/sass/script/lexer.rb, line 159 def next @tok ||= read_token @tok, tok = nil, @tok @prev = tok tok end
The number of bytes into the current line of the lexer’s current position (1-based).
@return [Fixnum]
# File lib/sass/script/lexer.rb, line 38 def offset return @offset unless @tok @tok.source_range.start_pos.offset end
Returns the next token without moving the lexer forward.
@return [Token] The next token
# File lib/sass/script/lexer.rb, line 181 def peek @tok ||= read_token end
Records all non-comment text the lexer consumes within the block and returns it as a string.
@yield A block in which text is recorded @return [String]
# File lib/sass/script/lexer.rb, line 224 def str old_pos = @tok ? @tok.pos : @scanner.pos yield new_pos = @tok ? @tok.pos : @scanner.pos @scanner.string[old_pos...new_pos] end
Rewinds the underlying StringScanner to before the token returned by {#peek}.
# File lib/sass/script/lexer.rb, line 187 def unpeek! if @tok @scanner.pos = @tok.pos @line = @tok.source_range.start_pos.line @offset = @tok.source_range.start_pos.offset end end
Returns whether or not there’s whitespace before the next token.
@return [Boolean]
# File lib/sass/script/lexer.rb, line 169 def whitespace?(tok = @tok) if tok @scanner.string[0...tok.pos] =~ /\s\Z/ else @scanner.string[@scanner.pos, 1] =~ /^\s/ || @scanner.string[@scanner.pos - 1, 1] =~ /\s\Z/ end end
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