Changed date parser to use lex/yacc.

1 files changed, 87 insertions, 1 deletions

diff --git a/times.cc b/times.cc
index 60926112..bb75f8d9 100644
--- a/times.cc
+++ b/times.cc
@@ -2,6 +2,92 @@
 
 namespace ledger {
 
-  ptime now = boost::posix_time::second_clock::universal_time();
+ptime now = boost::posix_time::second_clock::universal_time();
+bool  day_before_month = false;
+
+ptime parse_datetime(std::istream& in)
+{
+#if 1
+  return parse_abs_datetime(in);
+#else
+  std::string word;
+
+  if (! in.good() || in.eof())
+    return ptime();
+
+  in >> word;
+
+  // Grammar
+  //
+  // datetime:      absdate [time]
+  //              | reldate
+  //              | datetime preposition
+  //
+  // reldate:       NOW | TODAY | YESTERDAY | TOMORROW
+  //              | skip_or_quantity specifier
+  //
+  // skip_or_quantity: skip | quantity
+  //
+  // skip:          LAST | NEXT
+  //
+  // quantity:      INTEGER | CARDINAL
+  //
+  // specifier:     DAY | WEEK | MONTH | QUARTER | YEAR | DECADE
+  //
+  // preposition:   AGO | BACK
+  //              | BEFORE reldate
+  //              | SINCE/FROM reldate
+  //              | UNTIL reldate
+  //              | AFTER reldate
+
+  if (std::isdigit(word[0])) {
+    // This could be any of a variety of formats:
+    //
+    //   20070702 [TIME]
+    //   22072007T171940
+    //   22072007T171940-0700
+    //   2007-07-02 [TIME]
+    //   2007/07/02 [TIME]
+    //   2007.07.02 [TIME]
+    //   2007-Jul-22 [TIME]
+    //   07-22-2007 [TIME]
+    //   07-22-07 [TIME]
+    //   07/22/2007 [TIME]
+    //   07/22/2007 [TIME]
+    //   07.22.2007 [TIME]
+    //   07.22.07 [TIME]
+    //   22-07-2007 [TIME]
+    //   22-07-07 [TIME]
+    //   22/07/2007 [TIME]
+    //   22/07/07 [TIME]
+    //   22.07.2007 [TIME]
+    //   22.07.07 [TIME]
+    //   22 Jul 2007 [TIME]
+    //   22 July 2007 [TIME]
+    //
+    //   (NUMBER) (SPECIFIER)
+
+  } else {
+    // If there is no starting digit, then it could be any of these:
+    //
+    //   now
+    //   today
+    //   yesterday
+    //   tomorrow
+    //   (last|next) (week|month|quarter|year|decade)
+    //   (one|two|three|four|five|six|seven|eight|nine|ten) SPECIFIER
+    //   PREPOSITION DATE
+    //
+    // PREPOSITION = (from|after|before|since|until)
+    // SPECIFIER   = (weeks?|months?|quarters?|years?|decades?) (ago|back)
+    //
+    // 
+  }
+#endif
+}
+
+ptime datetime_range_from_stream(std::istream& in)
+{
+}
 
 }