Method: RSQL::EvalContext#safe_eval

Defined in:
lib/rsql/eval_context.rb

#safe_eval(content, results, stdout) ⇒ Object

Safely evaluate Ruby content within our context.



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# File 'lib/rsql/eval_context.rb', line 195

def safe_eval(content, results, stdout)
    @results = results

    # allow a simple reload to be called directly as it requires a
    # little looser safety valve...
    if 'reload' == content
        reload
        return
    end

    # same relaxed call to load too
    if m = content.match(/^\s*load\s+'(.+)'\s*$/)
        self.load(m[1])
        return
    end

    # help out the poor user and fix up any describes
    # requested so they don't need to remember that it needs
    # to be a symbol passed in
    if m = content.match(/^\s*desc\s+([^:]\S+)\s*$/)
        content = "desc :#{m[1]}"
    end

    if stdout
        # capture stdout
        orig_stdout = $stdout
        $stdout = stdout
    end

    begin
        # in order to print out errors in a loaded script so
        # that we have file/line info, we need to rescue their
        # exceptions inside the evaluation
        th = Thread.new do
            eval('begin;' << content << %q{
              rescue Exception => ex
                if @verbose
                    $stderr.puts("#{ex.class}: #{ex.message}", ex.backtrace)
                else
                    bt = []
                    ex.backtrace.each do |t|
                      break if t.include?('bin/rsql')
                      bt << t unless t.include?('lib/rsql/') || t.include?('(eval)')
                    end
                    $stderr.puts(ex.message.gsub(/\(eval\):\d+:/,''),bt)
                end
              end
            })
        end
        value = th.value
    rescue Exception => ex
        $stderr.puts(ex.message.gsub(/\(eval\):\d+:/,''))
    ensure
        $stdout = orig_stdout if stdout
    end

    return value
end