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/**
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* Copyright (c) 2015, Timothy Stack
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* * Neither the name of Timothy Stack nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include <assert.h>
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#include <cstdlib>
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#include "pcrepp.hh"
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#include "lnav_util.hh"
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#include "relative_time.hh"
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using namespace std;
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static struct {
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const char *name;
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pcrepp pcre;
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} MATCHERS[relative_time::RTT__MAX] = {
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{ "ws", pcrepp("\\A\\s+\\b") },
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{ "am", pcrepp("\\Aam|a\\.m\\.\\b") },
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{ "pm", pcrepp("\\Apm|p\\.m\\.\\b") },
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{ "a", pcrepp("\\Aa\\b") },
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{ "an", pcrepp("\\Aan\\b") },
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{ "at", pcrepp("\\Aat\\b") },
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{ "time", pcrepp("\\A(\\d{1,2}):(\\d{2})(?::(\\d{2}))?") },
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{ "num", pcrepp("\\A((?:-|\\+)?\\d+)") },
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{ "us", pcrepp("\\Amicros(?:econds?)?|us(?![a-zA-Z])") },
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{ "ms", pcrepp("\\Amillis(?:econds?)?|ms(?![a-zA-Z])") },
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{ "sec", pcrepp("\\As(?:ec(?:onds?)?)?(?![a-zA-Z])") },
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{ "min", pcrepp("\\Am(?:in(?:utes?)?)?(?![a-zA-Z])") },
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{ "h", pcrepp("\\Ah(?:ours?)?(?![a-zA-Z])") },
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{ "day", pcrepp("\\Ad(?:ays?)?(?![a-zA-Z])") },
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{ "week", pcrepp("\\Aw(?:eeks?)?(?![a-zA-Z])") },
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{ "mon", pcrepp("\\Amon(?:ths?)?(?![a-zA-Z])") },
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{ "year", pcrepp("\\Ay(?:ears?)?(?![a-zA-Z])") },
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{ "today", pcrepp("\\Atoday\\b") },
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{ "yest", pcrepp("\\Ayesterday\\b") },
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{ "tomo", pcrepp("\\Atomorrow\\b") },
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{ "noon", pcrepp("\\Anoon\\b") },
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{ "and", pcrepp("\\Aand\\b") },
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{ "ago", pcrepp("\\Aago\\b") },
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{ "lter", pcrepp("\\Alater\\b") },
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{ "bfor", pcrepp("\\Abefore\\b") },
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{ "now", pcrepp("\\Anow\\b") },
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{ "here", pcrepp("\\Ahere\\b") },
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};
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static int64_t TIME_SCALES[] = {
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1000 * 1000,
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60,
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60,
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24,
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};
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bool relative_time::parse(const char *str, size_t len, struct parse_error &pe_out)
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{
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pcre_input pi(str, 0, len);
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pcre_context_static<30> pc;
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int64_t number = 0;
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bool number_set = false;
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pe_out.pe_column = -1;
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pe_out.pe_msg.clear();
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while (true) {
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if (pi.pi_next_offset >= pi.pi_length) {
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if (number_set) {
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pe_out.pe_msg = "Number given without a time unit";
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return false;
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}
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this->rollover();
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return true;
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}
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bool found = false;
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for (int lpc = 0; lpc < RTT__MAX && !found; lpc++) {
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token_t token = (token_t) lpc;
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if (!MATCHERS[lpc].pcre.match(pc, pi, PCRE_ANCHORED)) {
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continue;
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}
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pe_out.pe_column = pc.all()->c_begin;
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found = true;
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if (RTT_MICROS <= token && token <= RTT_YEARS) {
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if (!number_set) {
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pe_out.pe_msg = "Expecting a number before time unit";
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return false;
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}
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number_set = false;
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}
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switch (token) {
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case RTT_YESTERDAY:
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case RTT_TODAY:
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case RTT_NOW: {
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struct timeval tv;
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struct exttm tm;
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int abs_start = 0, abs_end = RTF__MAX;
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gettimeofday(&tv, NULL);
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localtime_r(&tv.tv_sec, &tm.et_tm);
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tm.et_nsec = tv.tv_usec * 1000;
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this->add(tm);
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this->rt_field[RTF_YEARS] = tm.et_tm.tm_year;
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this->rt_field[RTF_MONTHS] = tm.et_tm.tm_mon;
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this->rt_field[RTF_DAYS] = tm.et_tm.tm_mday;
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switch (token) {
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case RTT_NOW:
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this->rt_field[RTF_HOURS] = tm.et_tm.tm_hour;
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this->rt_field[RTF_MINUTES] = tm.et_tm.tm_min;
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this->rt_field[RTF_SECONDS] = tm.et_tm.tm_sec;
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this->rt_field[RTF_MICROSECONDS] = tm.et_nsec / 1000;
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break;
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case RTT_YESTERDAY:
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this->rt_field[RTF_DAYS] -= 1;
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case RTT_TODAY:
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this->rt_field[RTF_HOURS] = 0;
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this->rt_field[RTF_MINUTES] = 0;
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this->rt_field[RTF_SECONDS] = 0;
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this->rt_field[RTF_MICROSECONDS] = 0;
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break;
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default:
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break;
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}
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for (int lpc = abs_start; lpc <= abs_end; lpc++) {
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this->rt_is_absolute[lpc] = true;
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}
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break;
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}
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case RTT_INVALID:
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case RTT_WHITE:
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case RTT_AND:
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break;
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case RTT_AM:
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case RTT_PM:
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if (number_set) {
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this->rt_field[RTF_HOURS] = number;
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this->rt_is_absolute[RTF_HOURS] = true;
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this->rt_field[RTF_MINUTES] = 0;
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this->rt_is_absolute[RTF_MINUTES] = true;
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this->rt_field[RTF_SECONDS] = 0;
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this->rt_is_absolute[RTF_SECONDS] = true;
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this->rt_field[RTF_MICROSECONDS] = 0;
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this->rt_is_absolute[RTF_MICROSECONDS] = true;
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number_set = false;
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}
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if (!this->rt_is_absolute[RTF_HOURS]) {
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pe_out.pe_msg = "Expecting absolute time with A.M. or P.M.";
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return false;
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}
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if (token == RTT_AM) {
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if (this->rt_field[RTF_HOURS] == 12) {
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this->rt_field[RTF_HOURS] = 0;
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}
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}
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else {
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this->rt_field[RTF_HOURS] += 12;
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}
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break;
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case RTT_A:
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case RTT_AN:
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number = 1;
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number_set = true;
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break;
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case RTT_AT:
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break;
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case RTT_TIME: {
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string hstr = pi.get_substr(pc[0]);
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string mstr = pi.get_substr(pc[1]);
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this->rt_field[RTF_HOURS] = atoi(hstr.c_str());
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this->rt_is_absolute[RTF_HOURS] = true;
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this->rt_field[RTF_MINUTES] = atoi(mstr.c_str());
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this->rt_is_absolute[RTF_MINUTES] = true;
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if (pc[2]->is_valid()) {
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string sstr = pi.get_substr(pc[2]);
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this->rt_field[RTF_SECONDS] = atoi(sstr.c_str());
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}
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else {
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this->rt_field[RTF_SECONDS] = 0;
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}
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this->rt_is_absolute[RTF_SECONDS] = true;
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this->rt_field[RTF_MICROSECONDS] = 0;
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this->rt_is_absolute[RTF_MICROSECONDS] = true;
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break;
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}
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case RTT_NUMBER: {
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if (number_set) {
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pe_out.pe_msg = "No time unit given for the previous number";
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return false;
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}
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string numstr = pi.get_substr(pc[0]);
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if (sscanf(numstr.c_str(), "%qd", &number) != 1) {
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pe_out.pe_msg = "Invalid number: " + numstr;
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return false;
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}
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number_set = true;
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break;
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}
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case RTT_MICROS:
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this->rt_field[RTF_MICROSECONDS] = number;
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break;
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case RTT_MILLIS:
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this->rt_field[RTF_MICROSECONDS] = number * 1000;
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break;
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case RTT_SECONDS:
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this->rt_field[RTF_SECONDS] = number;
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break;
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case RTT_MINUTES:
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this->rt_field[RTF_MINUTES] = number;
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break;
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case RTT_HOURS:
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this->rt_field[RTF_HOURS] = number;
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break;
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case RTT_DAYS:
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this->rt_field[RTF_DAYS] = number;
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break;
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case RTT_WEEKS:
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this->rt_field[RTF_DAYS] = number * 7;
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break;
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case RTT_MONTHS:
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this->rt_field[RTF_MONTHS] = number;
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break;
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case RTT_YEARS:
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this->rt_field[RTF_YEARS] = number;
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break;
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case RTT_BEFORE:
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case RTT_AGO:
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if (this->empty()) {
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pe_out.pe_msg = "Expecting a time unit";
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return false;
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}
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for (int field = 0; field < RTF__MAX; field++) {
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if (this->rt_field[field] > 0) {
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this->rt_field[field] = -this->rt_field[field];
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}
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}
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break;
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case RTT_LATER:
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if (this->empty()) {
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pe_out.pe_msg = "Expecting a time unit before 'later'";
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return false;
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}
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break;
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case RTT_HERE:
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break;
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case RTT_TOMORROW:
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this->rt_field[RTF_DAYS] = 1;
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break;
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case RTT_NOON:
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this->rt_field[RTF_HOURS] = 12;
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this->rt_is_absolute[RTF_HOURS] = true;
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for (int lpc = RTF_MICROSECONDS; lpc < RTF_HOURS; lpc++) {
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this->rt_field[lpc] = 0;
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this->rt_is_absolute[lpc] = true;
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}
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break;
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case RTT__MAX:
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assert(false);
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break;
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}
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}
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if (!found) {
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pe_out.pe_msg = "Unrecognized input";
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return false;
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}
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}
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}
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void relative_time::rollover()
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{
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for (int lpc = 0; lpc < RTF_DAYS; lpc++) {
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int64_t val = this->rt_field[lpc];
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this->rt_field[lpc] = val % TIME_SCALES[lpc];
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this->rt_field[lpc + 1] += val / TIME_SCALES[lpc];
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}
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if (std::abs(this->rt_field[RTF_DAYS]) > 31) {
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int64_t val = this->rt_field[RTF_DAYS];
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this->rt_field[RTF_DAYS] = val % 31;
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this->rt_field[RTF_MONTHS] += val / 31;
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}
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if (std::abs(this->rt_field[RTF_MONTHS]) > 12) {
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int64_t val = this->rt_field[RTF_MONTHS];
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this->rt_field[RTF_MONTHS] = val % 12;
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this->rt_field[RTF_YEARS] += val / 12;
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}
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}
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