Initial draft of the file format parser

1 files changed, 87 insertions, 0 deletions

diff --git a/parser.rb b/parser.rb
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+++ b/parser.rb
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+#!/usr/bin/env ruby
+
+require "pp"
+
+require "parslet"
+include Parslet
+
+class EntryParser < Parslet::Parser
+  root :doc
+
+  ### Type segments
+  rule(:hour)       { hour_.as(:hour) }
+  rule(:minute)     { minute_.as(:minute) }
+  rule(:second)     { second_.as(:second) }
+
+  rule(:year)       { year_.as(:year) }
+  rule(:month)      { month_.as(:month) }
+  rule(:day)        { day_.as(:day) }
+
+  rule(:time)       { time_.as(:time) }
+  rule(:local)      { local_.as(:local) }
+  rule(:offset)     { offset_.as(:offset) }
+
+  rule(:date)       { date_.as(:date) }
+  rule(:datetime)   { date >> str(" ") >> time }
+  rule(:daterange)  { start >> str(" -") >> stop }
+  
+  rule(:start)      { datetime.as(:start) }
+  rule(:stop)       { (str(" ") >> datetime).maybe.as(:stop) }
+  
+  rule(:title)      { title_.as(:title) }
+  rule(:doc)        { line_.repeat }
+
+  ### Combinatory segments
+  rule(:hour_)      { digit.repeat(2, 2) }
+  rule(:minute_)    { digit.repeat(2, 2) }
+  rule(:second_)    { digit.repeat(2, 2) }
+
+  rule(:time_)      { local >> offset }
+  rule(:date_)      { year >> str("-") >> month >> str("-") >> day }
+  
+  rule(:year_)      { digit.repeat(4, 4) }
+  rule(:month_)     { digit.repeat(2, 2) }
+  rule(:day_)       { digit.repeat(2, 2) }
+
+  rule(:local_)     { hour >> str(":") >> minute >> str(":") >> second }
+  rule(:offset_)    { match("[zZ]") | tnoffset_ }
+  rule(:poffset_)   { str(" ") >> match("[+\-]") }
+  rule(:tnoffset_)  { poffset_ >> hour >> str(":").maybe >> minute }
+  
+  rule(:title_)     { text >> str(":") }
+  
+  rule(:entry_)     { title >> spaces >> daterange }
+  rule(:comment)    { str("#") >> text }
+  rule(:line_)      { comment | entry_ |  newline }
+  
+  ### Primitive modes
+  rule(:digit)      { match("[0-9]") }
+  rule(:text)       { match("[a-zA-Z0-9 ]").repeat }
+  rule(:spaces)     { match("[ \t]").repeat }
+  rule(:newline)    { spaces.maybe >> str("\n") }
+end
+
+PP.pp EntryParser.new.parse("
+# This is a comment
+Bobs Burger:     2019-07-21 21:00:00 +0200 -
+")
+
+__END__
+
+# Following is an example of what the `timebox` file format looks like
+# Comment lines start with `#`, description lines start with ` `. Every
+# other line is an entry, with the account first, followed by `:`, then
+# time slice information in YYYY-MM-DD hh:mm:ss +TZ - ...
+# An ongoing shift is allowed to have no "end" time information
+
+Bobs Burger:       2019-07-21 21:00:00 +0200 - 2019-07-21 22:00:00 +0200
+  Learning how to not burn down the kitchen
+
+Bobs Burger:       2019-07-21 21:00:00 +0200 - 2019-07-21 22:00:00 +0200
+  Serving some food
+
+ACME Inc:          2019-07-21 21:00:00 +0200 - 2019-07-21 22:00:00 +0200
+ACME Inc:          2019-07-21 21:00:00 +0200 - 2019-07-21 22:00:00 +0200
+
+Bobs Burger:       2019-07-22 09:00:00 +0200 - 2019-07-22 15:00:00 +0200
+Bobs Burger:       2019-07-22 21:00:00 +0200 -