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78 lines
2.9 KiB
Ruby
78 lines
2.9 KiB
Ruby
require 'strscan'
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module Haml
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# This module contains functionality that's shared between Haml and Sass.
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module Shared
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extend self
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# Scans through a string looking for the interoplation-opening `#{`
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# and, when it's found, yields the scanner to the calling code
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# so it can handle it properly.
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#
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# The scanner will have any backslashes immediately in front of the `#{`
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# as the second capture group (`scan[2]`),
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# and the text prior to that as the first (`scan[1]`).
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#
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# @yieldparam scan [StringScanner] The scanner scanning through the string
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# @return [String] The text remaining in the scanner after all `#{`s have been processed
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def handle_interpolation(str)
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scan = StringScanner.new(str)
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yield scan while scan.scan(/(.*?)(\\*)\#\{/)
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scan.rest
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end
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# Moves a scanner through a balanced pair of characters.
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# For example:
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#
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# Foo (Bar (Baz bang) bop) (Bang (bop bip))
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# ^ ^
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# from to
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#
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# @param scanner [StringScanner] The string scanner to move
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# @param start [Character] The character opening the balanced pair.
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# A `Fixnum` in 1.8, a `String` in 1.9
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# @param finish [Character] The character closing the balanced pair.
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# A `Fixnum` in 1.8, a `String` in 1.9
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# @param count [Fixnum] The number of opening characters matched
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# before calling this method
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# @return [(String, String)] The string matched within the balanced pair
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# and the rest of the string.
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# `["Foo (Bar (Baz bang) bop)", " (Bang (bop bip))"]` in the example above.
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def balance(scanner, start, finish, count = 0)
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str = ''
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scanner = StringScanner.new(scanner) unless scanner.is_a? StringScanner
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regexp = Regexp.new("(.*?)[\\#{start.chr}\\#{finish.chr}]", Regexp::MULTILINE)
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while scanner.scan(regexp)
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str << scanner.matched
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count += 1 if scanner.matched[-1] == start
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count -= 1 if scanner.matched[-1] == finish
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return [str.strip, scanner.rest] if count == 0
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end
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end
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# Formats a string for use in error messages about indentation.
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#
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# @param indentation [String] The string used for indentation
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# @param was [Boolean] Whether or not to add `"was"` or `"were"`
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# (depending on how many characters were in `indentation`)
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# @return [String] The name of the indentation (e.g. `"12 spaces"`, `"1 tab"`)
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def human_indentation(indentation, was = false)
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if !indentation.include?(?\t)
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noun = 'space'
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elsif !indentation.include?(?\s)
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noun = 'tab'
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else
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return indentation.inspect + (was ? ' was' : '')
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end
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singular = indentation.length == 1
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if was
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was = singular ? ' was' : ' were'
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else
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was = ''
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end
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"#{indentation.length} #{noun}#{'s' unless singular}#{was}"
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end
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end
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end
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