60 lines
2.1 KiB
Ruby
60 lines
2.1 KiB
Ruby
require 'strscan'
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require 'sass/script/node'
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require 'sass/script/variable'
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require 'sass/script/funcall'
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require 'sass/script/operation'
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require 'sass/script/literal'
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require 'sass/script/parser'
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module Sass
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# SassScript is code that's embedded in Sass documents
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# to allow for property values to be computed from variables.
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#
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# This module contains code that handles the parsing and evaluation of SassScript.
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module Script
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# The character that begins a variable.
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VARIABLE_CHAR = ?!
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# The regular expression used to parse variables.
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MATCH = /^!([a-zA-Z_]\w*)\s*((?:\|\|)?=)\s*(.+)/
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# The regular expression used to validate variables without matching.
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VALIDATE = /^![a-zA-Z_]\w*$/
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# Parses and evaluates a string of SassScript.
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#
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# @param value [String] The SassScript
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# @param line [Fixnum] The number of the line on which the SassScript appeared.
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# Used for error reporting
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# @param offset [Fixnum] The number of characters in on `line` that the SassScript started.
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# Used for error reporting
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# @param environment [Sass::Environment] The environment in which to evaluate the SassScript
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# @return [String] The string result of evaluating the SassScript
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def self.resolve(value, line, offset, environment)
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parse(value, line, offset).perform(environment).to_s
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end
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# Parses a string of SassScript
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#
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# @param value [String] The SassScript
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# @param line [Fixnum] The number of the line on which the SassScript appeared.
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# Used for error reporting
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# @param offset [Fixnum] The number of characters in on `line` that the SassScript started.
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# Used for error reporting
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# @param filename [String] The path to the file in which the SassScript appeared.
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# Used for error reporting
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# @return [Script::Node] The root node of the parse tree
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def self.parse(value, line, offset, filename = nil)
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Parser.parse(value, line, offset, filename)
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rescue Sass::SyntaxError => e
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if e.message == "SassScript error"
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e.instance_eval do
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@message += ": #{value.dump}."
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end
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end
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e.sass_line = line
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raise e
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end
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end
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end
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