From: Zd Yu <zdyu2000@...>
Date: 2010-12-20T16:22:15+09:00
Subject: How to implement such a Domain-Specific-Language (DSL)?

I need to use Ruby to process performance data and calculate performance
metrics. What I have is a Hash that contains event_name => event_value
mappings. What I want to do is calculating metrics in a elegant style.

for example:

events = Hash.new

# reading the raw data.
# code omitted here.

# now I get the basic events, like
# events["event_A"] = 123.456
# events["event_B"] = 456.789

# the normal way looks like:
events["metric_A"] = events["event_A"] * 64 / events["event_B"]

# but what I am wondering if I can do it in an elegant way, like:
metric_A = event_A * 64 / event_B

Can anybody give some hints?

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