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Power Assert 2
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require "compiler/crystal/syntax" | |
class AssertToSVisitor < Crystal::ToSVisitor | |
getter locations = [] of Int32 | |
def visit_any(node) | |
if node.class.name.ends_with? "Literal" | |
@str << node.to_s | |
return false | |
end | |
if (loc = node.location) | |
@str << "(__" << locations.size << "=(" | |
locations << case node | |
when Crystal::Call | |
node.name_column_number | |
else | |
loc.column_number | |
end | |
end | |
super | |
end | |
def end_visit_any(node) | |
super | |
@str << "))" | |
end | |
end | |
src = ARGV[0].gsub('\n', ' ') | |
visitor = AssertToSVisitor.new(io = MemoryIO.new) | |
Crystal::Parser.parse(src).accept(visitor) | |
puts "unless #{io}" | |
puts " puts " + src.inspect | |
visitor.locations.each_with_index do |loc, i| | |
puts %{ puts "#{" " * (loc - 1)}^\#{__#{i}}"} | |
end | |
puts "end" | |
print "#" * 80 |
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macro assert(expr) | |
{% puts o = run("./assert", expr) %} | |
{{ o }} | |
end | |
foo = "foo" | |
assert %{foo.index('o') == 1 + 2} |
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unless (__0=(((__1=((__2=(foo)).index('o')))) == ((__3=(1 + 2))))) | |
puts "foo.index('o') == 1 + 2" | |
puts " ^#{__0}" | |
puts " ^#{__1}" | |
puts "^#{__2}" | |
puts " ^#{__3}" | |
end | |
################################################################################ | |
foo.index('o') == 1 + 2 | |
^false | |
^1 | |
^foo | |
^3 |
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