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RSpec::Matchers.define :match do |expected|
match do |actual|
@captures ||= false
match = actual.match(expected)
match &&= @captures.all? { |k, v| match[k] == v } if @captures
match
end
chain :capturing do |captures|
@captures = captures
end
failure_message do |actual|
require 'pp'
match = actual.match(expected)
if match
key, value = @captures.detect { |k, v| match[k] != v }
message = "expected %p to capture %p as %p when matching %p, but got %p\n\nRegular Expression:\n%p" % [
actual.to_s, key, value, expected, match[key], actual.regexp
]
if ast = actual.instance_variable_get(:@ast)
require 'mustermann/ast/tree_renderer'
tree = Mustermann::AST::TreeRenderer.render(ast)
message << "\n\nAST:\n#{tree}"
end
message
else
"expected %p to match %p" % [ actual, expected ]
end
end
failure_message_when_negated do |actual|
"expected %p not to match %p" % [
actual.to_s, expected
]
end
end
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