Adding upstream version 0.11.1.upstream/0.11.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1134 insertions, 0 deletions

diff --git a/src/relative_time.cc b/src/relative_time.cc
new file mode 100644
index 0000000..e6f1118
--- /dev/null
+++ b/src/relative_time.cc
@@ -0,0 +1,1134 @@
+/**
+ * Copyright (c) 2015, Timothy Stack
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * * Neither the name of Timothy Stack nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <unordered_set>
+
+#include "relative_time.hh"
+
+#include "base/time_util.hh"
+#include "config.h"
+#include "pcrepp/pcre2pp.hh"
+#include "scn/scn.h"
+
+using namespace std::chrono_literals;
+
+static const struct {
+    const char* name;
+    lnav::pcre2pp::code pcre;
+} MATCHERS[relative_time::RTT__MAX] = {
+    {
+        "ws",
+        lnav::pcre2pp::code::from_const("\\A\\s+\\b"),
+    },
+    {
+        "am",
+        lnav::pcre2pp::code::from_const("\\Aam|a\\.m\\.\\b"),
+    },
+    {
+        "pm",
+        lnav::pcre2pp::code::from_const("\\Apm|p\\.m\\.\\b"),
+    },
+    {
+        "a",
+        lnav::pcre2pp::code::from_const("\\Aa\\b"),
+    },
+    {
+        "an",
+        lnav::pcre2pp::code::from_const("\\Aan\\b"),
+    },
+    {
+        "at",
+        lnav::pcre2pp::code::from_const("\\Aat\\b"),
+    },
+    {
+        "time",
+        lnav::pcre2pp::code::from_const(
+            "\\A(\\d{1,2}):(\\d{2})(?::(\\d{2})(?:\\.(\\d{3,6}))?)?"),
+    },
+    {
+        "num",
+        lnav::pcre2pp::code::from_const("\\A((?:-|\\+)?\\d+)"),
+    },
+
+    {
+        "sun",
+        lnav::pcre2pp::code::from_const("\\Asun(days?)?\\b"),
+    },
+    {
+        "mon",
+        lnav::pcre2pp::code::from_const("\\Amon(days?)?\\b"),
+    },
+    {
+        "tue",
+        lnav::pcre2pp::code::from_const("\\Atue(s(days?)?)?\\b"),
+    },
+    {
+        "wed",
+        lnav::pcre2pp::code::from_const("\\Awed(nesdays?)?\\b"),
+    },
+    {
+        "thu",
+        lnav::pcre2pp::code::from_const("\\Athu(rsdays?)?\\b"),
+    },
+    {
+        "fri",
+        lnav::pcre2pp::code::from_const("\\Afri(days?)?\\b"),
+    },
+    {
+        "sat",
+        lnav::pcre2pp::code::from_const("\\Asat(urdays?)?\\b"),
+    },
+
+    {
+        "us",
+        lnav::pcre2pp::code::from_const(
+            "\\A(?:micros(?:econds?)?|us(?![a-zA-Z]))"),
+    },
+    {
+        "ms",
+        lnav::pcre2pp::code::from_const(
+            "\\A(?:millis(?:econds?)?|ms(?![a-zA-Z]))"),
+    },
+    {
+        "sec",
+        lnav::pcre2pp::code::from_const("\\As(?:ec(?:onds?)?)?(?![a-zA-Z])"),
+    },
+    {
+        "min",
+        lnav::pcre2pp::code::from_const("\\Am(?:in(?:utes?)?)?(?![a-zA-Z])"),
+    },
+    {
+        "h",
+        lnav::pcre2pp::code::from_const("\\Ah(?:ours?)?(?![a-zA-Z])"),
+    },
+    {
+        "day",
+        lnav::pcre2pp::code::from_const("\\Ad(?:ays?)?(?![a-zA-Z])"),
+    },
+    {
+        "week",
+        lnav::pcre2pp::code::from_const("\\Aw(?:eeks?)?(?![a-zA-Z])"),
+    },
+    {
+        "mon",
+        lnav::pcre2pp::code::from_const("\\Amon(?:ths?)?(?![a-zA-Z])"),
+    },
+    {
+        "year",
+        lnav::pcre2pp::code::from_const("\\Ay(?:ears?)?(?![a-zA-Z])"),
+    },
+    {
+        "today",
+        lnav::pcre2pp::code::from_const("\\Atoday\\b"),
+    },
+    {
+        "yest",
+        lnav::pcre2pp::code::from_const("\\Ayesterday\\b"),
+    },
+    {
+        "tomo",
+        lnav::pcre2pp::code::from_const("\\Atomorrow\\b"),
+    },
+    {
+        "noon",
+        lnav::pcre2pp::code::from_const("\\Anoon\\b"),
+    },
+    {
+        "and",
+        lnav::pcre2pp::code::from_const("\\Aand\\b"),
+    },
+    {
+        "the",
+        lnav::pcre2pp::code::from_const("\\Athe\\b"),
+    },
+    {
+        "ago",
+        lnav::pcre2pp::code::from_const("\\Aago\\b"),
+    },
+    {
+        "lter",
+        lnav::pcre2pp::code::from_const("\\Alater\\b"),
+    },
+    {
+        "bfor",
+        lnav::pcre2pp::code::from_const("\\Abefore\\b"),
+    },
+    {
+        "aft",
+        lnav::pcre2pp::code::from_const("\\Aafter\\b"),
+    },
+    {
+        "now",
+        lnav::pcre2pp::code::from_const("\\Anow\\b"),
+    },
+    {
+        "here",
+        lnav::pcre2pp::code::from_const("\\Ahere\\b"),
+    },
+    {
+        "next",
+        lnav::pcre2pp::code::from_const("\\Anext\\b"),
+    },
+    {
+        "previous",
+        lnav::pcre2pp::code::from_const("\\A(?:previous\\b|last\\b)"),
+    },
+};
+
+static int64_t TIME_SCALES[] = {
+    1000 * 1000,
+    60,
+    60,
+    24,
+};
+
+const char relative_time::FIELD_CHARS[] = {
+    'u',
+    's',
+    'm',
+    'h',
+    'd',
+    'M',
+    'y',
+};
+
+Result<relative_time, relative_time::parse_error>
+relative_time::from_str(string_fragment str)
+{
+    int64_t number = 0;
+    bool number_set = false, number_was_set = false;
+    bool next_set = false;
+    token_t base_token = RTT_INVALID;
+    rt_field_type last_field_type = RTF__MAX;
+    relative_time retval;
+    parse_error pe_out;
+    std::unordered_set<int> seen_tokens;
+
+    pe_out.pe_column = 0;
+    pe_out.pe_msg.clear();
+
+    auto remaining = str;
+    while (true) {
+        rt_field_type curr_field_type = RTF__MAX;
+
+        if (remaining.empty()) {
+            if (number_set) {
+                if (number > 1970 && number < 2050) {
+                    retval.rt_field[RTF_YEARS] = number - 1900;
+                    retval.rt_absolute_field_end = RTF__MAX;
+
+                    switch (base_token) {
+                        case RTT_BEFORE: {
+                            auto epoch = retval.to_timeval();
+                            retval.rt_duration
+                                = std::chrono::duration_cast<
+                                      std::chrono::microseconds>(
+                                      std::chrono::seconds(epoch.tv_sec))
+                                + std::chrono::microseconds(epoch.tv_usec);
+                            retval.rt_field[RTF_YEARS] = 70;
+                            break;
+                        }
+                        case RTT_AFTER:
+                            retval.rt_duration = std::chrono::duration_cast<
+                                std::chrono::microseconds>(
+                                std::chrono::hours(24 * 365 * 200));
+                            break;
+                        default:
+                            break;
+                    }
+                    return Ok(retval);
+                }
+
+                pe_out.pe_msg = "Number given without a time unit";
+                return Err(pe_out);
+            }
+
+            if (base_token != RTT_INVALID) {
+                switch (base_token) {
+                    case RTT_BEFORE:
+                        pe_out.pe_msg
+                            = "'before' requires a point in time (e.g. before "
+                              "10am)";
+                        break;
+                    case RTT_AFTER:
+                        pe_out.pe_msg
+                            = "'after' requires a point in time (e.g. after "
+                              "10am)";
+                        break;
+                    default:
+                        ensure(false);
+                        break;
+                }
+                return Err(pe_out);
+            }
+
+            retval.rollover();
+            return Ok(retval);
+        }
+
+        bool found = false;
+        for (int lpc = 0; lpc < RTT__MAX && !found; lpc++) {
+            static thread_local auto md = lnav::pcre2pp::match_data::unitialized();
+
+            token_t token = (token_t) lpc;
+            auto match_res = MATCHERS[lpc]
+                                 .pcre.capture_from(remaining)
+                                 .into(md)
+                                 .matches()
+                                 .ignore_error();
+            if (!match_res) {
+                continue;
+            }
+
+            remaining = match_res->f_remaining;
+            pe_out.pe_column = match_res->f_all.sf_begin;
+            found = true;
+            if (RTT_MICROS <= token && token <= RTT_YEARS) {
+                if (!number_set) {
+                    if (base_token != RTT_INVALID) {
+                        base_token = RTT_INVALID;
+                        retval.rt_absolute_field_end = RTF__MAX;
+                        continue;
+                    }
+                    if (!retval.rt_next && !retval.rt_previous) {
+                        pe_out.pe_msg = "Expecting a number before time unit";
+                        return Err(pe_out);
+                    }
+                }
+                number_was_set = number_set;
+                number_set = false;
+            }
+            switch (token) {
+                case RTT_YESTERDAY:
+                case RTT_TODAY:
+                case RTT_NOW: {
+                    if (seen_tokens.count(token) > 0) {
+                        pe_out.pe_msg
+                            = "Current time reference has already been used";
+                        return Err(pe_out);
+                    }
+
+                    seen_tokens.insert(RTT_YESTERDAY);
+                    seen_tokens.insert(RTT_TODAY);
+                    seen_tokens.insert(RTT_NOW);
+
+                    struct timeval tv;
+                    struct exttm tm;
+
+                    gettimeofday(&tv, nullptr);
+                    localtime_r(&tv.tv_sec, &tm.et_tm);
+                    tm.et_nsec = tv.tv_usec * 1000;
+                    tm = retval.adjust(tm);
+
+                    retval.rt_field[RTF_YEARS] = tm.et_tm.tm_year;
+                    retval.rt_field[RTF_MONTHS] = tm.et_tm.tm_mon;
+                    retval.rt_field[RTF_DAYS] = tm.et_tm.tm_mday;
+                    switch (token) {
+                        case RTT_NOW:
+                            retval.rt_field[RTF_HOURS] = tm.et_tm.tm_hour;
+                            retval.rt_field[RTF_MINUTES] = tm.et_tm.tm_min;
+                            retval.rt_field[RTF_SECONDS] = tm.et_tm.tm_sec;
+                            retval.rt_field[RTF_MICROSECONDS]
+                                = tm.et_nsec / 1000;
+                            break;
+                        case RTT_YESTERDAY:
+                            retval.rt_field[RTF_DAYS].value -= 1;
+                        case RTT_TODAY:
+                            retval.rt_field[RTF_HOURS] = 0;
+                            retval.rt_field[RTF_MINUTES] = 0;
+                            retval.rt_field[RTF_SECONDS] = 0;
+                            retval.rt_field[RTF_MICROSECONDS] = 0;
+                            break;
+                        default:
+                            break;
+                    }
+                    retval.rt_absolute_field_end = RTF__MAX;
+                    break;
+                }
+                case RTT_INVALID:
+                case RTT_WHITE:
+                case RTT_AND:
+                case RTT_THE:
+                    curr_field_type = last_field_type;
+                    break;
+                case RTT_AM:
+                case RTT_PM:
+                    if (seen_tokens.count(token) > 0) {
+                        pe_out.pe_msg = "Time has already been set";
+                        return Err(pe_out);
+                    }
+                    seen_tokens.insert(RTT_AM);
+                    seen_tokens.insert(RTT_PM);
+                    if (number_set) {
+                        retval.rt_field[RTF_HOURS] = number;
+                        retval.rt_field[RTF_MINUTES] = 0;
+                        retval.rt_field[RTF_SECONDS] = 0;
+                        retval.rt_field[RTF_MICROSECONDS] = 0;
+                        retval.rt_duration = 1min;
+                        retval.rt_absolute_field_end = RTF__MAX;
+                        number_set = false;
+                    }
+                    if (!retval.is_absolute(RTF_YEARS)) {
+                        pe_out.pe_msg
+                            = "Expecting absolute time with A.M. or P.M.";
+                        return Err(pe_out);
+                    }
+                    if (token == RTT_AM) {
+                        if (retval.rt_field[RTF_HOURS].value == 12) {
+                            retval.rt_field[RTF_HOURS] = 0;
+                        }
+                    } else if (retval.rt_field[RTF_HOURS].value < 12) {
+                        retval.rt_field[RTF_HOURS].value += 12;
+                    }
+                    if (base_token == RTT_AFTER) {
+                        std::chrono::microseconds usecs = 0s;
+                        uint64_t carry = 0;
+
+                        if (retval.rt_field[RTF_MICROSECONDS].value > 0) {
+                            usecs += std::chrono::microseconds(
+                                1000000ULL
+                                - retval.rt_field[RTF_MICROSECONDS].value);
+                            carry = 1;
+                        }
+                        if (carry || retval.rt_field[RTF_SECONDS].value > 0) {
+                            usecs += std::chrono::seconds(
+                                60 - carry
+                                - retval.rt_field[RTF_SECONDS].value);
+                            carry = 1;
+                        }
+                        if (carry || retval.rt_field[RTF_MINUTES].value > 0) {
+                            usecs += std::chrono::minutes(
+                                60 - carry
+                                - retval.rt_field[RTF_MINUTES].value);
+                            carry = 1;
+                        }
+                        usecs += std::chrono::hours(
+                            24 - retval.rt_field[RTF_HOURS].value);
+                        retval.rt_duration = usecs;
+                    }
+                    if (base_token == RTT_BEFORE) {
+                        retval.rt_duration
+                            = std::chrono::hours(
+                                  retval.rt_field[RTF_HOURS].value)
+                            + std::chrono::minutes(
+                                  retval.rt_field[RTF_MINUTES].value)
+                            + std::chrono::seconds(
+                                  retval.rt_field[RTF_SECONDS].value)
+                            + std::chrono::microseconds(
+                                  retval.rt_field[RTF_MICROSECONDS].value);
+                        retval.rt_field[RTF_HOURS].value = 0;
+                        retval.rt_field[RTF_MINUTES].value = 0;
+                        retval.rt_field[RTF_SECONDS].value = 0;
+                        retval.rt_field[RTF_MICROSECONDS].value = 0;
+                    }
+                    base_token = RTT_INVALID;
+                    break;
+                case RTT_A:
+                case RTT_AN:
+                    number = 1;
+                    number_set = true;
+                    break;
+                case RTT_AT:
+                    break;
+                case RTT_TIME: {
+                    const auto hstr = md[1]->to_string();
+                    const auto mstr = md[2]->to_string();
+                    retval.rt_field[RTF_HOURS] = atoi(hstr.c_str());
+                    retval.rt_field[RTF_MINUTES] = atoi(mstr.c_str());
+                    if (md[3]) {
+                        const auto sstr = md[3]->to_string();
+                        retval.rt_field[RTF_SECONDS] = atoi(sstr.c_str());
+                        if (md[4]) {
+                            const auto substr = md[4]->to_string();
+
+                            switch (substr.length()) {
+                                case 3:
+                                    retval.rt_field[RTF_MICROSECONDS]
+                                        = atoi(substr.c_str()) * 1000;
+                                    break;
+                                case 6:
+                                    retval.rt_field[RTF_MICROSECONDS]
+                                        = atoi(substr.c_str());
+                                    break;
+                            }
+                        } else {
+                            retval.rt_field[RTF_MICROSECONDS].clear();
+                            retval.rt_duration = 1s;
+                        }
+                    } else {
+                        retval.rt_field[RTF_SECONDS].clear();
+                        retval.rt_field[RTF_MICROSECONDS].clear();
+                        retval.rt_duration = 1min;
+                    }
+                    retval.rt_absolute_field_end = RTF__MAX;
+                    break;
+                }
+                case RTT_NUMBER: {
+                    if (number_set) {
+                        pe_out.pe_msg
+                            = "No time unit given for the previous number";
+                        return Err(pe_out);
+                    }
+
+                    auto num_scan_res
+                        = scn::scan_value<int64_t>(md[0]->to_string_view());
+
+                    if (!num_scan_res) {
+                        pe_out.pe_msg = fmt::format(
+                            FMT_STRING("Invalid number: {}"), md[0].value());
+                        return Err(pe_out);
+                    }
+                    number = num_scan_res.value();
+                    number_set = true;
+                    break;
+                }
+                case RTT_MICROS:
+                    retval.rt_field[RTF_MICROSECONDS] = number;
+                    break;
+                case RTT_MILLIS:
+                    retval.rt_field[RTF_MICROSECONDS] = number * 1000;
+                    break;
+                case RTT_SECONDS:
+                    if (number_was_set) {
+                        retval.rt_field[RTF_SECONDS] = number;
+                        curr_field_type = RTF_SECONDS;
+                    } else if (next_set) {
+                        retval.rt_field[RTF_MICROSECONDS] = 0;
+                        retval.rt_absolute_field_end = RTF__MAX;
+                    }
+                    break;
+                case RTT_MINUTES:
+                    if (number_was_set) {
+                        retval.rt_field[RTF_MINUTES] = number;
+                        curr_field_type = RTF_MINUTES;
+                    } else if (next_set) {
+                        retval.rt_field[RTF_MICROSECONDS] = 0;
+                        retval.rt_field[RTF_SECONDS] = 0;
+                        retval.rt_absolute_field_end = RTF__MAX;
+                    }
+                    break;
+                case RTT_HOURS:
+                    if (number_was_set) {
+                        retval.rt_field[RTF_HOURS] = number;
+                        curr_field_type = RTF_HOURS;
+                    } else if (next_set) {
+                        retval.rt_field[RTF_MICROSECONDS] = 0;
+                        retval.rt_field[RTF_SECONDS] = 0;
+                        retval.rt_field[RTF_MINUTES] = 0;
+                        retval.rt_absolute_field_end = RTF__MAX;
+                    }
+                    break;
+                case RTT_DAYS:
+                    if (number_was_set) {
+                        retval.rt_field[RTF_DAYS] = number;
+                        curr_field_type = RTF_DAYS;
+                    } else if (next_set) {
+                        retval.rt_field[RTF_MICROSECONDS] = 0;
+                        retval.rt_field[RTF_SECONDS] = 0;
+                        retval.rt_field[RTF_MINUTES] = 0;
+                        retval.rt_field[RTF_HOURS] = 0;
+                        retval.rt_absolute_field_end = RTF__MAX;
+                    }
+                    break;
+                case RTT_WEEKS:
+                    retval.rt_field[RTF_DAYS] = number * 7;
+                    break;
+                case RTT_MONTHS:
+                    if (number_was_set) {
+                        retval.rt_field[RTF_MONTHS] = number;
+                        curr_field_type = RTF_MONTHS;
+                    } else if (next_set) {
+                        retval.rt_field[RTF_MICROSECONDS] = 0;
+                        retval.rt_field[RTF_SECONDS] = 0;
+                        retval.rt_field[RTF_MINUTES] = 0;
+                        retval.rt_field[RTF_HOURS] = 0;
+                        retval.rt_field[RTF_DAYS] = 0;
+                        retval.rt_absolute_field_end = RTF__MAX;
+                    }
+                    break;
+                case RTT_YEARS:
+                    if (number_was_set) {
+                        retval.rt_field[RTF_YEARS] = number;
+                        curr_field_type = RTF_YEARS;
+                    } else if (next_set) {
+                        retval.rt_field[RTF_MICROSECONDS] = 0;
+                        retval.rt_field[RTF_SECONDS] = 0;
+                        retval.rt_field[RTF_MINUTES] = 0;
+                        retval.rt_field[RTF_HOURS] = 0;
+                        retval.rt_field[RTF_DAYS] = 0;
+                        retval.rt_field[RTF_MONTHS] = 0;
+                        retval.rt_absolute_field_end = RTF__MAX;
+                    }
+                    break;
+                case RTT_AGO:
+                    if (retval.empty()) {
+                        pe_out.pe_msg = "Expecting a time unit";
+                        return Err(pe_out);
+                    }
+                    for (int field = 0; field < RTF__MAX; field++) {
+                        if (retval.rt_field[field].value > 0) {
+                            retval.rt_field[field]
+                                = -retval.rt_field[field].value;
+                        }
+                        if (last_field_type != RTF__MAX
+                            && field < last_field_type)
+                        {
+                            retval.rt_field[field] = 0;
+                        }
+                    }
+                    if (last_field_type != RTF__MAX) {
+                        retval.rt_absolute_field_end = last_field_type;
+                    }
+                    break;
+                case RTT_BEFORE:
+                case RTT_AFTER:
+                    if (base_token != RTT_INVALID) {
+                        pe_out.pe_msg
+                            = "Before/after ranges are not supported yet";
+                        return Err(pe_out);
+                    }
+                    base_token = token;
+                    break;
+                case RTT_LATER:
+                    if (retval.empty()) {
+                        pe_out.pe_msg = "Expecting a time unit before 'later'";
+                        return Err(pe_out);
+                    }
+                    break;
+                case RTT_HERE:
+                    break;
+                case RTT_NEXT:
+                    retval.rt_next = true;
+                    next_set = true;
+                    break;
+                case RTT_PREVIOUS:
+                    retval.rt_previous = true;
+                    next_set = true;
+                    break;
+                case RTT_TOMORROW:
+                    retval.rt_field[RTF_DAYS] = 1;
+                    break;
+                case RTT_NOON:
+                    retval.rt_field[RTF_HOURS] = 12;
+                    retval.rt_absolute_field_end = RTF__MAX;
+                    for (int lpc2 = RTF_MICROSECONDS; lpc2 < RTF_HOURS; lpc2++)
+                    {
+                        retval.rt_field[lpc2] = 0;
+                    }
+                    break;
+
+                case RTT_SUNDAY:
+                case RTT_MONDAY:
+                case RTT_TUESDAY:
+                case RTT_WEDNESDAY:
+                case RTT_THURSDAY:
+                case RTT_FRIDAY:
+                case RTT_SATURDAY:
+                    if (retval.rt_duration == 0s) {
+                        switch (base_token) {
+                            case RTT_BEFORE:
+                                if (token == RTT_SUNDAY) {
+                                    pe_out.pe_msg
+                                        = "Sunday is the start of the week, so "
+                                          "there is nothing before it";
+                                    return Err(pe_out);
+                                }
+                                for (int wday = RTT_SUNDAY; wday < token;
+                                     wday++)
+                                {
+                                    retval.rt_included_days.insert(
+                                        (token_t) wday);
+                                }
+                                break;
+                            case RTT_AFTER:
+                                if (token == RTT_SATURDAY) {
+                                    pe_out.pe_msg
+                                        = "Saturday is the end of the week, so "
+                                          "there is nothing after it";
+                                    return Err(pe_out);
+                                }
+                                for (int wday = RTT_SATURDAY; wday > token;
+                                     wday--)
+                                {
+                                    retval.rt_included_days.insert(
+                                        (token_t) wday);
+                                }
+                                break;
+                            default:
+                                retval.rt_included_days.insert(token);
+                                break;
+                        }
+                        base_token = RTT_INVALID;
+                    } else {
+                        retval.rt_included_days.insert(token);
+                    }
+                    if (retval.rt_duration == 0s) {
+                        retval.rt_duration = 24h;
+                    }
+                    break;
+
+                case RTT__MAX:
+                    ensure(false);
+                    break;
+            }
+
+            if (token != RTT_NEXT && token != RTT_PREVIOUS
+                && token != RTT_WHITE)
+            {
+                next_set = false;
+            }
+
+            number_was_set = false;
+            seen_tokens.insert(token);
+        }
+
+        if (!found) {
+            pe_out.pe_msg = "Unrecognized input";
+            return Err(pe_out);
+        }
+
+        last_field_type = curr_field_type;
+    }
+}
+
+void
+relative_time::rollover()
+{
+    for (int lpc = 0; lpc < RTF_DAYS; lpc++) {
+        if (!this->rt_field[lpc].is_set) {
+            continue;
+        }
+        int64_t val = this->rt_field[lpc].value;
+        this->rt_field[lpc].value = val % TIME_SCALES[lpc];
+        this->rt_field[lpc + 1].value += val / TIME_SCALES[lpc];
+        if (this->rt_field[lpc + 1].value) {
+            this->rt_field[lpc + 1].is_set = true;
+        }
+    }
+    if (std::abs(this->rt_field[RTF_DAYS].value) > 31) {
+        int64_t val = this->rt_field[RTF_DAYS].value;
+        this->rt_field[RTF_DAYS].value = val % 31;
+        this->rt_field[RTF_MONTHS].value += val / 31;
+        if (this->rt_field[RTF_MONTHS].value) {
+            this->rt_field[RTF_MONTHS].is_set = true;
+        }
+    }
+    if (std::abs(this->rt_field[RTF_MONTHS].value) > 12) {
+        int64_t val = this->rt_field[RTF_MONTHS].value;
+        this->rt_field[RTF_MONTHS].value = val % 12;
+        this->rt_field[RTF_YEARS].value += val / 12;
+        if (this->rt_field[RTF_YEARS].value) {
+            this->rt_field[RTF_YEARS].is_set = true;
+        }
+    }
+}
+
+relative_time
+relative_time::from_timeval(const struct timeval& tv)
+{
+    relative_time retval;
+
+    retval.clear();
+    retval.rt_field[RTF_SECONDS] = tv.tv_sec;
+    retval.rt_field[RTF_MICROSECONDS] = tv.tv_usec;
+    retval.rollover();
+
+    return retval;
+}
+
+relative_time
+relative_time::from_usecs(std::chrono::microseconds usecs)
+{
+    relative_time retval;
+
+    retval.clear();
+    retval.rt_field[RTF_MICROSECONDS] = usecs.count();
+    retval.rollover();
+
+    return retval;
+}
+
+std::string
+relative_time::to_string() const
+{
+    static const char* DAYS[] = {
+        "sun",
+        "mon",
+        "tue",
+        "wed",
+        "thu",
+        "fri",
+        "sat",
+    };
+
+    char dst[128] = "";
+    char* pos = dst;
+
+    if (this->is_absolute()) {
+        for (const auto& day_token : this->rt_included_days) {
+            pos += snprintf(pos,
+                            sizeof(dst) - (pos - dst),
+                            "%s ",
+                            DAYS[day_token - RTT_SUNDAY]);
+        }
+
+        pos += snprintf(
+            pos,
+            sizeof(dst) - (pos - dst),
+            "%s",
+            this->rt_next ? "next " : (this->rt_previous ? "last " : ""));
+        if (this->rt_field[RTF_YEARS].is_set
+            && (this->rt_next || this->rt_previous
+                || this->rt_field[RTF_YEARS].value != 0))
+        {
+            pos += snprintf(pos,
+                            sizeof(dst) - (pos - dst),
+                            "year %" PRId64 " ",
+                            this->rt_field[RTF_YEARS].value);
+        } else if ((this->rt_next || this->rt_previous)
+                   && this->rt_field[RTF_MONTHS].is_set)
+        {
+            pos += snprintf(pos, sizeof(dst) - (pos - dst), "year ");
+        }
+        if (this->rt_field[RTF_MONTHS].is_set
+            && (this->rt_next || this->rt_previous
+                || this->rt_field[RTF_MONTHS].value != 0))
+        {
+            pos += snprintf(pos,
+                            sizeof(dst) - (pos - dst),
+                            "month %" PRId64 " ",
+                            this->rt_field[RTF_MONTHS].value);
+        } else if ((this->rt_next || this->rt_previous)
+                   && this->rt_field[RTF_DAYS].is_set)
+        {
+            pos += snprintf(pos, sizeof(dst) - (pos - dst), "month ");
+        }
+        if (this->rt_field[RTF_DAYS].is_set
+            && (this->rt_next || this->rt_previous
+                || this->rt_field[RTF_DAYS].value != 0))
+        {
+            pos += snprintf(pos,
+                            sizeof(dst) - (pos - dst),
+                            "day %" PRId64 " ",
+                            this->rt_field[RTF_DAYS].value);
+        } else if ((this->rt_next || this->rt_previous)
+                   && this->rt_field[RTF_HOURS].is_set)
+        {
+            pos += snprintf(pos, sizeof(dst) - (pos - dst), "day ");
+        }
+        pos += snprintf(pos,
+                        sizeof(dst) - (pos - dst),
+                        "%" PRId64 ":%02" PRId64,
+                        this->rt_field[RTF_HOURS].value,
+                        this->rt_field[RTF_MINUTES].value);
+        if (this->rt_field[RTF_SECONDS].is_set
+            && this->rt_field[RTF_SECONDS].value != 0)
+        {
+            pos += snprintf(pos,
+                            sizeof(dst) - (pos - dst),
+                            ":%.02" PRId64,
+                            this->rt_field[RTF_SECONDS].value);
+            if (this->rt_field[RTF_MICROSECONDS].is_set
+                && this->rt_field[RTF_MICROSECONDS].value != 0)
+            {
+                pos += snprintf(pos,
+                                sizeof(dst) - (pos - dst),
+                                ".%.03" PRId64,
+                                this->rt_field[RTF_MICROSECONDS].value / 1000);
+            }
+        }
+    } else {
+        for (int lpc = RTF__MAX - 1; lpc >= 0; lpc--) {
+            if (this->rt_field[lpc].value == 0) {
+                continue;
+            }
+            pos += snprintf(pos,
+                            sizeof(dst) - (pos - dst),
+                            "%" PRId64 "%c",
+                            this->rt_field[lpc].value,
+                            FIELD_CHARS[lpc]);
+        }
+    }
+
+    if (dst[0] == '\0') {
+        dst[0] = '0';
+        dst[1] = 's';
+        dst[2] = '\0';
+    }
+
+    return dst;
+}
+
+struct exttm
+relative_time::adjust(const exttm& tm) const
+{
+    auto retval = tm;
+
+    if (this->rt_field[RTF_MICROSECONDS].is_set
+        && this->is_absolute(RTF_MICROSECONDS))
+    {
+        retval.et_nsec = this->rt_field[RTF_MICROSECONDS].value * 1000;
+    } else {
+        retval.et_nsec += this->rt_field[RTF_MICROSECONDS].value * 1000;
+    }
+    if (this->rt_field[RTF_SECONDS].is_set && this->is_absolute(RTF_SECONDS)) {
+        if (this->rt_next
+            && this->rt_field[RTF_SECONDS].value <= tm.et_tm.tm_sec)
+        {
+            retval.et_tm.tm_min += 1;
+        }
+        if (this->rt_previous
+            && this->rt_field[RTF_SECONDS].value >= tm.et_tm.tm_sec)
+        {
+            retval.et_tm.tm_min -= 1;
+        }
+        retval.et_tm.tm_sec = this->rt_field[RTF_SECONDS].value;
+    } else {
+        retval.et_tm.tm_sec += this->rt_field[RTF_SECONDS].value;
+    }
+    if (this->rt_field[RTF_MINUTES].is_set && this->is_absolute(RTF_MINUTES)) {
+        if (this->rt_next
+            && this->rt_field[RTF_MINUTES].value <= tm.et_tm.tm_min)
+        {
+            retval.et_tm.tm_hour += 1;
+        }
+        if (this->rt_previous
+            && (this->rt_field[RTF_MINUTES].value == 0
+                || (this->rt_field[RTF_MINUTES].value >= tm.et_tm.tm_min)))
+        {
+            retval.et_tm.tm_hour -= 1;
+        }
+        retval.et_tm.tm_min = this->rt_field[RTF_MINUTES].value;
+    } else {
+        retval.et_tm.tm_min += this->rt_field[RTF_MINUTES].value;
+    }
+    if (this->rt_field[RTF_HOURS].is_set && this->is_absolute(RTF_HOURS)) {
+        if (this->rt_next
+            && this->rt_field[RTF_HOURS].value <= tm.et_tm.tm_hour)
+        {
+            retval.et_tm.tm_mday += 1;
+        }
+        if (this->rt_previous
+            && this->rt_field[RTF_HOURS].value >= tm.et_tm.tm_hour)
+        {
+            retval.et_tm.tm_mday -= 1;
+        }
+        retval.et_tm.tm_hour = this->rt_field[RTF_HOURS].value;
+    } else {
+        retval.et_tm.tm_hour += this->rt_field[RTF_HOURS].value;
+    }
+    if (this->rt_field[RTF_DAYS].is_set && this->is_absolute(RTF_DAYS)) {
+        if (this->rt_next && this->rt_field[RTF_DAYS].value <= tm.et_tm.tm_mday)
+        {
+            retval.et_tm.tm_mon += 1;
+        }
+        if (this->rt_previous
+            && this->rt_field[RTF_DAYS].value >= tm.et_tm.tm_mday)
+        {
+            retval.et_tm.tm_mon -= 1;
+        }
+        retval.et_tm.tm_mday = this->rt_field[RTF_DAYS].value;
+    } else {
+        retval.et_tm.tm_mday += this->rt_field[RTF_DAYS].value;
+    }
+    if (this->rt_field[RTF_MONTHS].is_set && this->is_absolute(RTF_MONTHS)) {
+        if (this->rt_next
+            && this->rt_field[RTF_MONTHS].value <= tm.et_tm.tm_mon)
+        {
+            retval.et_tm.tm_year += 1;
+        }
+        if (this->rt_previous
+            && this->rt_field[RTF_MONTHS].value >= tm.et_tm.tm_mon)
+        {
+            retval.et_tm.tm_year -= 1;
+        }
+        retval.et_tm.tm_mon = this->rt_field[RTF_MONTHS].value;
+    } else {
+        retval.et_tm.tm_mon += this->rt_field[RTF_MONTHS].value;
+    }
+    if (this->rt_field[RTF_YEARS].is_set && this->is_absolute(RTF_YEARS)) {
+        retval.et_tm.tm_year = this->rt_field[RTF_YEARS].value;
+    } else {
+        retval.et_tm.tm_year += this->rt_field[RTF_YEARS].value;
+    }
+
+    return retval;
+}
+
+nonstd::optional<exttm>
+relative_time::window_start(const struct exttm& tm) const
+{
+    auto retval = tm;
+
+    if (this->is_relative()) {
+        uint64_t us, remainder;
+
+        auto tv = tm.to_timeval();
+        us = (uint64_t) tv.tv_sec * 1000000ULL + (uint64_t) tv.tv_usec;
+        remainder = us % this->to_microseconds();
+        us -= remainder;
+
+        tv.tv_sec = us / 1000000ULL;
+        tv.tv_usec = us % 1000000ULL;
+
+        retval.et_tm = *gmtime(&tv.tv_sec);
+        retval.et_nsec = tv.tv_usec * 1000ULL;
+
+        return retval;
+    }
+
+    bool clear = false;
+
+    if (this->rt_field[RTF_YEARS].is_set) {
+        if (this->rt_field[RTF_YEARS].value > tm.et_tm.tm_year) {
+            return nonstd::nullopt;
+        }
+        retval.et_tm.tm_year = this->rt_field[RTF_YEARS].value;
+        clear = true;
+    }
+
+    if (this->rt_field[RTF_MONTHS].is_set) {
+        if (this->rt_field[RTF_MONTHS].value > tm.et_tm.tm_mon) {
+            return nonstd::nullopt;
+        }
+        retval.et_tm.tm_mon = this->rt_field[RTF_MONTHS].value;
+        clear = true;
+    } else if (clear) {
+        retval.et_tm.tm_mon = 0;
+    }
+
+    if (this->rt_field[RTF_DAYS].is_set) {
+        if (this->rt_field[RTF_DAYS].value > tm.et_tm.tm_mday) {
+            return nonstd::nullopt;
+        }
+        retval.et_tm.tm_mday = this->rt_field[RTF_DAYS].value;
+        clear = true;
+    } else if (clear) {
+        retval.et_tm.tm_mday = 1;
+    }
+
+    if (!this->rt_included_days.empty()) {
+        auto iter = this->rt_included_days.find(
+            (token_t) (RTT_SUNDAY + tm.et_tm.tm_wday));
+
+        if (iter == this->rt_included_days.end()) {
+            return nonstd::nullopt;
+        }
+        clear = true;
+    }
+
+    if (this->rt_field[RTF_HOURS].is_set) {
+        if (this->rt_field[RTF_HOURS].value > tm.et_tm.tm_hour) {
+            return nonstd::nullopt;
+        }
+        retval.et_tm.tm_hour = this->rt_field[RTF_HOURS].value;
+        clear = true;
+    } else if (clear) {
+        retval.et_tm.tm_hour = 0;
+    }
+
+    if (this->rt_field[RTF_MINUTES].is_set) {
+        if (this->rt_field[RTF_MINUTES].value > tm.et_tm.tm_min) {
+            return nonstd::nullopt;
+        }
+        retval.et_tm.tm_min = this->rt_field[RTF_MINUTES].value;
+        clear = true;
+    } else if (clear) {
+        retval.et_tm.tm_min = 0;
+    }
+
+    if (this->rt_field[RTF_SECONDS].is_set) {
+        if (this->rt_field[RTF_SECONDS].value > tm.et_tm.tm_sec) {
+            return nonstd::nullopt;
+        }
+        retval.et_tm.tm_sec = this->rt_field[RTF_SECONDS].value;
+        clear = true;
+    } else if (clear) {
+        retval.et_tm.tm_sec = 0;
+    }
+
+    if (this->rt_field[RTF_MICROSECONDS].is_set) {
+        if (this->rt_field[RTF_MICROSECONDS].value > tm.et_nsec / 1000) {
+            return nonstd::nullopt;
+        }
+        retval.et_nsec = this->rt_field[RTF_MICROSECONDS].value * 1000ULL;
+        clear = true;
+    } else if (clear) {
+        retval.et_nsec = 0;
+    }
+
+    auto tv = tm.to_timeval();
+    auto start_time = retval.to_timeval();
+    auto end_time = relative_time::from_usecs(this->rt_duration)
+                        .adjust(retval)
+                        .to_timeval();
+
+    if (tv < start_time || end_time < tv) {
+        return nonstd::nullopt;
+    }
+
+    return retval;
+}
+
+int64_t
+relative_time::to_microseconds() const
+{
+    int64_t retval;
+
+    if (this->is_absolute()) {
+        struct exttm etm;
+
+        memset(&etm, 0, sizeof(etm));
+        etm.et_tm.tm_year = this->rt_field[RTF_YEARS].value;
+        etm.et_tm.tm_mon = this->rt_field[RTF_MONTHS].value;
+        if (this->rt_field[RTF_DAYS].is_set) {
+            etm.et_tm.tm_mday = this->rt_field[RTF_DAYS].value;
+        } else {
+            etm.et_tm.tm_mday = 1;
+        }
+        etm.et_tm.tm_min = this->rt_field[RTF_MINUTES].value;
+        etm.et_tm.tm_sec = this->rt_field[RTF_SECONDS].value;
+
+        auto epoch_secs = std::chrono::seconds(tm2sec(&etm.et_tm));
+        retval
+            = std::chrono::duration_cast<std::chrono::microseconds>(epoch_secs)
+                  .count();
+        retval += this->rt_field[RTF_MICROSECONDS].value;
+    } else {
+        retval = this->rt_field[RTF_YEARS].value * 12;
+        retval = (retval + this->rt_field[RTF_MONTHS].value) * 30;
+        retval = (retval + this->rt_field[RTF_DAYS].value) * 24;
+        retval = (retval + this->rt_field[RTF_HOURS].value) * 60;
+        retval = (retval + this->rt_field[RTF_MINUTES].value) * 60;
+        retval = (retval + this->rt_field[RTF_SECONDS].value) * 1000 * 1000;
+        retval = (retval + this->rt_field[RTF_MICROSECONDS].value);
+    }
+
+    return retval;
+}