diff --git a/cronexpr.go b/cronexpr.go index 2fc7477..94cbf59 100644 --- a/cronexpr.go +++ b/cronexpr.go @@ -14,10 +14,8 @@ package cronexpr /******************************************************************************/ import ( - "regexp" + "fmt" "sort" - "strconv" - "strings" "time" ) @@ -33,12 +31,13 @@ type Expression struct { daysOfMonth map[int]bool workdaysOfMonth map[int]bool lastDayOfMonth bool + lastWorkdayOfMonth bool daysOfMonthRestricted bool actualDaysOfMonthList []int monthList []int daysOfWeek map[int]bool - specificWeekdaysOfWeek map[int]bool - lastWeekdaysOfWeek map[int]bool + specificWeekDaysOfWeek map[int]bool + lastWeekDaysOfWeek map[int]bool daysOfWeekRestricted bool yearList []int } @@ -51,50 +50,90 @@ type Expression struct { // about what is a well-formed cron expression from this library's point of // view. func MustParse(cronLine string) *Expression { - cronLineNormalized := cronNormalize(cronLine) - - // Split into fields - cronFields := regexp.MustCompile(`\s+`).Split(cronLineNormalized, -1) - - // Our cron expression parser expects 7 fields: - // second minute hour dayofmonth month dayofweek year - // Standard cron is 6 fields with year field being optional - // minute hour dayofmonth month dayofweek {year} - // Thus... - // If we have 5 fields, append wildcard year field - if len(cronFields) < 6 { - cronFields = append(cronFields, "*") + expr, err := Parse(cronLine) + if err != nil { + panic(err) } - // If we have 6 fields, prepend match-once second field - if len(cronFields) < 7 { - cronFields = append(cronFields, "") - copy(cronFields[1:], cronFields[0:]) - cronFields[0] = "0" - } - // At this point, we should have at least 7 fields. Fields beyond the - // seventh one, if any, are ignored. - if len(cronFields) < 7 { - panic("MustParse(): Not enough fields in the cron time expression\n") + return expr +} + +/******************************************************************************/ + +// Parse returns a new Expression pointer. An error is returned if a malformed +// cron expression is supplied. +// See for documentation +// about what is a well-formed cron expression from this library's point of +// view. +func Parse(cronLine string) (*Expression, error) { + + // Maybe one of the built-in aliases is being used + cron := cronNormalizer.Replace(cronLine) + + indices := fieldFinder.FindAllStringIndex(cron, -1) + if len(indices) < 5 { + return nil, fmt.Errorf("Missing field(s)") } - // Generic parser can be used for most fields - cronExpr := &Expression{ - expression: cronLine, - secondList: genericFieldParse(cronFields[0], 0, 59), - minuteList: genericFieldParse(cronFields[1], 0, 59), - hourList: genericFieldParse(cronFields[2], 0, 23), - monthList: genericFieldParse(cronFields[4], 1, 12), - yearList: genericFieldParse(cronFields[6], 1970, 2099), + expr := Expression{} + field := 0 + + // second field (optional) + if len(indices) >= 7 { + err := expr.secondFieldHandler(cron[indices[field][0]:indices[field][1]]) + if err != nil { + return nil, err + } + field += 1 + } else { + expr.secondList = []int{0} } - // Days of month/days of week is a bit more complicated, due - // to their extended syntax, and the fact that days per - // month is a variable quantity, and relation between - // days of week and days of month depends on the month/year. - cronExpr.dayofmonthFieldParse(cronFields[3]) - cronExpr.dayofweekFieldParse(cronFields[5]) + // minute field + err := expr.minuteFieldHandler(cron[indices[field][0]:indices[field][1]]) + if err != nil { + return nil, err + } + field += 1 - return cronExpr + // hour field + err = expr.hourFieldHandler(cron[indices[field][0]:indices[field][1]]) + if err != nil { + return nil, err + } + field += 1 + + // day of month field + err = expr.domFieldHandler(cron[indices[field][0]:indices[field][1]]) + if err != nil { + return nil, err + } + field += 1 + + // month field + err = expr.monthFieldHandler(cron[indices[field][0]:indices[field][1]]) + if err != nil { + return nil, err + } + field += 1 + + // day of week field + err = expr.dowFieldHandler(cron[indices[field][0]:indices[field][1]]) + if err != nil { + return nil, err + } + field += 1 + + // year field + if field < len(indices) { + err = expr.yearFieldHandler(cron[indices[field][0]:indices[field][1]]) + if err != nil { + return nil, err + } + } else { + expr.yearList = yearDescriptor.defaultList + } + + return &expr, nil } /******************************************************************************/ @@ -200,7 +239,7 @@ func (expr *Expression) Next(fromTime time.Time) time.Time { // matching time instants exist, the number of returned entries will be less // than `n`. func (expr *Expression) NextN(fromTime time.Time, n uint) []time.Time { - nextTimes := make([]time.Time, 0) + nextTimes := make([]time.Time, 0, n) if n > 0 { fromTime = expr.Next(fromTime) for { @@ -217,487 +256,3 @@ func (expr *Expression) NextN(fromTime time.Time, n uint) []time.Time { } return nextTimes } - -/******************************************************************************/ - -func (expr *Expression) nextYear(t time.Time) time.Time { - // Find index at which item in list is greater or equal to - // candidate year - i := sort.SearchInts(expr.yearList, t.Year()+1) - if i == len(expr.yearList) { - return time.Time{} - } - // Year changed, need to recalculate actual days of month - expr.actualDaysOfMonthList = expr.calculateActualDaysOfMonth(expr.yearList[i], expr.monthList[0]) - if len(expr.actualDaysOfMonthList) == 0 { - return expr.nextMonth(time.Date( - expr.yearList[i], - time.Month(expr.monthList[0]), - 1, - expr.hourList[0], - expr.minuteList[0], - expr.secondList[0], - 0, - t.Location())) - } - return time.Date( - expr.yearList[i], - time.Month(expr.monthList[0]), - expr.actualDaysOfMonthList[0], - expr.hourList[0], - expr.minuteList[0], - expr.secondList[0], - 0, - t.Location()) -} - -/******************************************************************************/ - -func (expr *Expression) nextMonth(t time.Time) time.Time { - // Find index at which item in list is greater or equal to - // candidate month - i := sort.SearchInts(expr.monthList, int(t.Month())+1) - if i == len(expr.monthList) { - return expr.nextYear(t) - } - // Month changed, need to recalculate actual days of month - expr.actualDaysOfMonthList = expr.calculateActualDaysOfMonth(t.Year(), expr.monthList[i]) - if len(expr.actualDaysOfMonthList) == 0 { - return expr.nextMonth(time.Date( - t.Year(), - time.Month(expr.monthList[i]), - 1, - expr.hourList[0], - expr.minuteList[0], - expr.secondList[0], - 0, - t.Location())) - } - - return time.Date( - t.Year(), - time.Month(expr.monthList[i]), - expr.actualDaysOfMonthList[0], - expr.hourList[0], - expr.minuteList[0], - expr.secondList[0], - 0, - t.Location()) -} - -/******************************************************************************/ - -func (expr *Expression) calculateActualDaysOfMonth(year, month int) []int { - actualDaysOfMonthMap := make(map[int]bool) - timeOrigin := time.Date(year, time.Month(month), 1, 0, 0, 0, 0, time.UTC) - lastDayOfMonth := timeOrigin.AddDate(0, 1, -1).Day() - - // As per crontab man page (http://linux.die.net/man/5/crontab#): - // "The day of a command's execution can be specified by two - // "fields - day of month, and day of week. If both fields are - // "restricted (ie, aren't *), the command will be run when - // "either field matches the current time" - if expr.daysOfMonthRestricted || expr.daysOfWeekRestricted == false { - // Last day of month - if expr.lastDayOfMonth { - actualDaysOfMonthMap[lastDayOfMonth] = true - } - // Days of month - for v := range expr.daysOfMonth { - // Ignore days beyond end of month - if v <= lastDayOfMonth { - actualDaysOfMonthMap[v] = true - } - } - // Work days of month - // As per Wikipedia: month boundaries are not crossed. - for v := range expr.workdaysOfMonth { - // Ignore days beyond end of month - if v <= lastDayOfMonth { - // If saturday, then friday - if timeOrigin.AddDate(0, 0, v-1).Weekday() == time.Saturday { - if v > 1 { - v -= 1 - } else { - v += 2 - } - // If sunday, then monday - } else if timeOrigin.AddDate(0, 0, v-1).Weekday() == time.Sunday { - if v < lastDayOfMonth { - v += 1 - } else { - v -= 2 - } - } - actualDaysOfMonthMap[v] = true - } - } - } - - if expr.daysOfWeekRestricted { - // How far first sunday is from first day of month - offset := 7 - int(timeOrigin.Weekday()) - // days of week - // offset : (7 - day_of_week_of_1st_day_of_month) - // target : 1 + (7 * week_of_month) + (offset + day_of_week) % 7 - for w := 0; w <= 4; w += 1 { - for v := range expr.daysOfWeek { - v := 1 + w*7 + (offset+v)%7 - if v <= lastDayOfMonth { - actualDaysOfMonthMap[v] = true - } - } - } - // days of week of specific week in the month - // offset : (7 - day_of_week_of_1st_day_of_month) - // target : 1 + (7 * week_of_month) + (offset + day_of_week) % 7 - for v := range expr.specificWeekdaysOfWeek { - v := 1 + 7*(v/7) + (offset+v)%7 - if v <= lastDayOfMonth { - actualDaysOfMonthMap[v] = true - } - } - // Last days of week of the month - lastWeekOrigin := timeOrigin.AddDate(0, 1, -7) - offset = 7 - int(lastWeekOrigin.Weekday()) - for v := range expr.lastWeekdaysOfWeek { - v := lastWeekOrigin.Day() + (offset+v)%7 - if v <= lastDayOfMonth { - actualDaysOfMonthMap[v] = true - } - } - } - - return toList(actualDaysOfMonthMap) -} - -/******************************************************************************/ - -func (expr *Expression) nextDayOfMonth(t time.Time) time.Time { - // Find index at which item in list is greater or equal to - // candidate day of month - i := sort.SearchInts(expr.actualDaysOfMonthList, t.Day()+1) - if i == len(expr.actualDaysOfMonthList) { - return expr.nextMonth(t) - } - - return time.Date( - t.Year(), - t.Month(), - expr.actualDaysOfMonthList[i], - expr.hourList[0], - expr.minuteList[0], - expr.secondList[0], - 0, - t.Location()) -} - -/******************************************************************************/ - -func (expr *Expression) nextHour(t time.Time) time.Time { - // Find index at which item in list is greater or equal to - // candidate hour - i := sort.SearchInts(expr.hourList, t.Hour()+1) - if i == len(expr.hourList) { - return expr.nextDayOfMonth(t) - } - - return time.Date( - t.Year(), - t.Month(), - t.Day(), - expr.hourList[i], - expr.minuteList[0], - expr.secondList[0], - 0, - t.Location()) -} - -/******************************************************************************/ - -func (expr *Expression) nextMinute(t time.Time) time.Time { - // Find index at which item in list is greater or equal to - // candidate minute - i := sort.SearchInts(expr.minuteList, t.Minute()+1) - if i == len(expr.minuteList) { - return expr.nextHour(t) - } - - return time.Date( - t.Year(), - t.Month(), - t.Day(), - t.Hour(), - expr.minuteList[i], - expr.secondList[0], - 0, - t.Location()) -} - -/******************************************************************************/ - -func (expr *Expression) nextSecond(t time.Time) time.Time { - // nextSecond() assumes all other fields are exactly matched - // to the cron expression - - // Find index at which item in list is greater or equal to - // candidate second - i := sort.SearchInts(expr.secondList, t.Second()+1) - if i == len(expr.secondList) { - return expr.nextMinute(t) - } - - return time.Date( - t.Year(), - t.Month(), - t.Day(), - t.Hour(), - t.Minute(), - expr.secondList[i], - 0, - t.Location()) -} - -/******************************************************************************/ - -var cronNormalizer = strings.NewReplacer( - // Order is important! - "@yearly", "0 0 0 1 1 * *", - "@annually", "0 0 0 1 1 * *", - "@monthly", "0 0 0 1 * * *", - "@weekly", "0 0 0 * * 0 *", - "@daily", "0 0 0 * * * *", - "@hourly", "0 0 * * * * *", - "january", "1", - "february", "2", - "march", "3", - "april", "4", - "may", "5", - "june", "6", - "july", "7", - "august", "8", - "september", "9", - "october", "0", - "november", "1", - "december", "2", - "sunday", "0", - "monday", "1", - "tuesday", "2", - "wednesday", "3", - "thursday", "4", - "friday", "5", - "saturday", "6", - "jan", "1", - "feb", "2", - "mar", "3", - "apr", "4", - "jun", "6", - "jul", "7", - "aug", "8", - "sep", "9", - "oct", "10", - "nov", "11", - "dec", "12", - "sun", "0", - "mon", "1", - "tue", "2", - "wed", "3", - "thu", "4", - "fri", "5", - "sat", "6", - "?", "*") - -func cronNormalize(cronLine string) string { - cronLine = strings.TrimSpace(cronLine) - cronLine = strings.ToLower(cronLine) - cronLine = cronNormalizer.Replace(cronLine) - return cronLine -} - -/******************************************************************************/ - -func (expr *Expression) dayofweekFieldParse(cronField string) { - // Defaults - expr.daysOfWeekRestricted = true - expr.daysOfWeek = make(map[int]bool) - expr.lastWeekdaysOfWeek = make(map[int]bool) - expr.specificWeekdaysOfWeek = make(map[int]bool) - - // "You can also mix all of the above, as in: 1-5,10,12,20-30/5" - cronList := strings.Split(cronField, ",") - for _, s := range cronList { - // "/" - step, s := extractInterval(s) - // "*" - if s == "*" { - expr.daysOfWeekRestricted = (step > 1) - populateMany(expr.daysOfWeek, 0, 6, step) - continue - } - // "-" - // week day interval for all weeks - i := strings.Index(s, "-") - if i >= 0 { - min := atoi(s[:i]) % 7 - max := atoi(s[i+1:]) % 7 - populateMany(expr.daysOfWeek, min, max, step) - continue - } - // single value - // "l": week day for last week - i = strings.Index(s, "l") - if i >= 0 { - populateOne(expr.lastWeekdaysOfWeek, atoi(s[:i])%7) - continue - } - // "#": week day for specific week - i = strings.Index(s, "#") - if i >= 0 { - // v#w - v := atoi(s[:i]) % 7 - w := atoi(s[i+1:]) - // v domain = [0,7] - // w domain = [1,5] - populateOne(expr.specificWeekdaysOfWeek, (w-1)*7+(v%7)) - continue - } - // week day interval for all weeks - if step > 0 { - v := atoi(s) % 7 - populateMany(expr.daysOfWeek, v, 6, step) - continue - } - // single week day for all weeks - v := atoi(s) % 7 - populateOne(expr.daysOfWeek, v) - } -} - -/******************************************************************************/ - -func (expr *Expression) dayofmonthFieldParse(cronField string) { - // Defaults - expr.daysOfMonthRestricted = true - expr.lastDayOfMonth = false - - expr.daysOfMonth = make(map[int]bool) // days of month map - expr.workdaysOfMonth = make(map[int]bool) // work day of month map - - // Comma separator is used to mix different allowed syntax - cronList := strings.Split(cronField, ",") - for _, s := range cronList { - // "/" - step, s := extractInterval(s) - // "*" - if s == "*" { - expr.daysOfMonthRestricted = (step > 1) - populateMany(expr.daysOfMonth, 1, 31, step) - continue - } - // "-" - i := strings.Index(s, "-") - if i >= 0 { - populateMany(expr.daysOfMonth, atoi(s[:i]), atoi(s[i+1:]), step) - continue - } - // single value - // "l": last day of month - if s == "l" { - expr.lastDayOfMonth = true - continue - } - // "w": week day - i = strings.Index(s, "w") - if i >= 0 { - populateOne(expr.workdaysOfMonth, atoi(s[:i])) - continue - } - // single value with interval - if step > 0 { - populateMany(expr.daysOfMonth, atoi(s), 31, step) - continue - } - // single value - populateOne(expr.daysOfMonth, atoi(s)) - } -} - -/******************************************************************************/ - -func genericFieldParse(cronField string, min, max int) []int { - // Defaults - values := make(map[int]bool) - - // Comma separator is used to mix different allowed syntax - cronList := strings.Split(cronField, ",") - for _, s := range cronList { - // "/" - step, s := extractInterval(s) - // "*" - if s == "*" { - populateMany(values, min, max, step) - continue - } - // "-" - i := strings.Index(s, "-") - if i >= 0 { - populateMany(values, atoi(s[:i]), atoi(s[i+1:]), step) - continue - } - // single value with interval - if step > 0 { - populateMany(values, atoi(s), max, step) - continue - } - // single value - populateOne(values, atoi(s)) - } - - return toList(values) -} - -/******************************************************************************/ - -// Local helpers - -func extractInterval(s string) (int, string) { - step := 0 - i := strings.Index(s, "/") - if i >= 0 { - step = atoi(s[i+1:]) - s = s[:i] - } - return step, s -} - -func atoi(s string) int { - v, err := strconv.Atoi(s) - if err != nil { - panic(err) - } - return v -} - -func populateOne(values map[int]bool, v int) { - values[v] = true -} - -func populateMany(values map[int]bool, min, max, step int) { - if step == 0 { - step = 1 - } - for i := min; i <= max; i += step { - values[i] = true - } -} - -func toList(set map[int]bool) []int { - list := make([]int, len(set)) - i := 0 - for k := range set { - list[i] = k - i += 1 - } - sort.Ints(list) - return list -} diff --git a/cronexpr_impl.go b/cronexpr_impl.go new file mode 100644 index 0000000..3ca2e82 --- /dev/null +++ b/cronexpr_impl.go @@ -0,0 +1,739 @@ +/*! + * Copyright 2013 Raymond Hill + * + * Project: github.com/gorhill/cronexpr + * File: cronexpr_impl.go + * Version: 1.0 + * License: GPL v3 see + * + */ + +package cronexpr + +/******************************************************************************/ + +import ( + "fmt" + "regexp" + "sort" + "strings" + "time" +) + +/******************************************************************************/ + +var ( + genericDefaultList []int = []int{ + 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, + 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, + 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, + 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, + 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, + 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, + } + yearDefaultList []int = []int{ + 1970, 1971, 1972, 1973, 1974, 1975, 1976, 1977, 1978, 1979, + 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, + 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, + 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, + 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, + 2020, 2021, 2022, 2023, 2024, 2025, 2026, 2027, 2028, 2029, + 2030, 2031, 2032, 2033, 2034, 2035, 2036, 2037, 2038, 2039, + 2040, 2041, 2042, 2043, 2044, 2045, 2046, 2047, 2048, 2049, + 2050, 2051, 2052, 2053, 2054, 2055, 2056, 2057, 2058, 2059, + 2060, 2061, 2062, 2063, 2064, 2065, 2066, 2067, 2068, 2069, + 2070, 2071, 2072, 2073, 2074, 2075, 2076, 2077, 2078, 2079, + 2080, 2081, 2082, 2083, 2084, 2085, 2086, 2087, 2088, 2089, + 2090, 2091, 2092, 2093, 2094, 2095, 2096, 2097, 2098, 2099, + } +) + +/******************************************************************************/ + +var ( + numberTokens map[string]int = map[string]int{ + "0": 0, "1": 1, "2": 2, "3": 3, "4": 4, "5": 5, "6": 6, "7": 7, "8": 8, "9": 9, + "10": 10, "11": 11, "12": 12, "13": 13, "14": 14, "15": 15, "16": 16, "17": 17, "18": 18, "19": 19, + "20": 20, "21": 21, "22": 22, "23": 23, "24": 24, "25": 25, "26": 26, "27": 27, "28": 28, "29": 29, + "30": 30, "31": 31, "32": 32, "33": 33, "34": 34, "35": 35, "36": 36, "37": 37, "38": 38, "39": 39, + "40": 40, "41": 41, "42": 42, "43": 43, "44": 44, "45": 45, "46": 46, "47": 47, "48": 48, "49": 49, + "50": 50, "51": 51, "52": 52, "53": 53, "54": 54, "55": 55, "56": 56, "57": 57, "58": 58, "59": 59, + "1970": 1970, "1971": 1971, "1972": 1972, "1973": 1973, "1974": 1974, "1975": 1975, "1976": 1976, "1977": 1977, "1978": 1978, "1979": 1979, + "1980": 1980, "1981": 1981, "1982": 1982, "1983": 1983, "1984": 1984, "1985": 1985, "1986": 1986, "1987": 1987, "1988": 1988, "1989": 1989, + "1990": 1990, "1991": 1991, "1992": 1992, "1993": 1993, "1994": 1994, "1995": 1995, "1996": 1996, "1997": 1997, "1998": 1998, "1999": 1999, + "2000": 2000, "2001": 2001, "2002": 2002, "2003": 2003, "2004": 2004, "2005": 2005, "2006": 2006, "2007": 2007, "2008": 2008, "2009": 2009, + "2010": 2010, "2011": 2011, "2012": 2012, "2013": 2013, "2014": 2014, "2015": 2015, "2016": 2016, "2017": 2017, "2018": 2018, "2019": 2019, + "2020": 2020, "2021": 2021, "2022": 2022, "2023": 2023, "2024": 2024, "2025": 2025, "2026": 2026, "2027": 2027, "2028": 2028, "2029": 2029, + "2030": 2030, "2031": 2031, "2032": 2032, "2033": 2033, "2034": 2034, "2035": 2035, "2036": 2036, "2037": 2037, "2038": 2038, "2039": 2039, + "2040": 2040, "2041": 2041, "2042": 2042, "2043": 2043, "2044": 2044, "2045": 2045, "2046": 2046, "2047": 2047, "2048": 2048, "2049": 2049, + "2050": 2050, "2051": 2051, "2052": 2052, "2053": 2053, "2054": 2054, "2055": 2055, "2056": 2056, "2057": 2057, "2058": 2058, "2059": 2059, + "2060": 2060, "2061": 2061, "2062": 2062, "2063": 2063, "2064": 2064, "2065": 2065, "2066": 2066, "2067": 2067, "2068": 2068, "2069": 2069, + "2070": 2070, "2071": 2071, "2072": 2072, "2073": 2073, "2074": 2074, "2075": 2075, "2076": 2076, "2077": 2077, "2078": 2078, "2079": 2079, + "2080": 2080, "2081": 2081, "2082": 2082, "2083": 2083, "2084": 2084, "2085": 2085, "2086": 2086, "2087": 2087, "2088": 2088, "2089": 2089, + "2090": 2090, "2091": 2091, "2092": 2092, "2093": 2093, "2094": 2094, "2095": 2095, "2096": 2096, "2097": 2097, "2098": 2098, "2099": 2099, + } + monthTokens map[string]int = map[string]int{ + `1`: 1, `jan`: 1, `january`: 1, + `2`: 2, `feb`: 2, `february`: 2, + `3`: 3, `mar`: 3, `march`: 3, + `4`: 4, `apr`: 4, `april`: 4, + `5`: 5, `may`: 5, + `6`: 6, `jun`: 6, `june`: 6, + `7`: 7, `jul`: 7, `july`: 7, + `8`: 8, `aug`: 8, `august`: 8, + `9`: 9, `sep`: 9, `september`: 9, + `10`: 10, `oct`: 10, `october`: 10, + `11`: 11, `nov`: 11, `november`: 11, + `12`: 12, `dec`: 12, `december`: 12, + } + dowTokens map[string]int = map[string]int{ + `0`: 0, `sun`: 0, `sunday`: 0, + `1`: 1, `mon`: 1, `monday`: 1, + `2`: 2, `tue`: 2, `tuesday`: 2, + `3`: 3, `wed`: 3, `wednesday`: 3, + `4`: 4, `thu`: 4, `thursday`: 4, + `5`: 5, `fri`: 5, `friday`: 5, + `6`: 6, `sat`: 6, `saturday`: 6, + `7`: 0, + } +) + +/******************************************************************************/ + +func atoi(s string) int { + return numberTokens[s] +} + +type fieldDescriptor struct { + name string + min, max int + defaultList []int + valuePattern string + atoi func(string) int +} + +var ( + secondDescriptor fieldDescriptor = fieldDescriptor{ + name: "second", + min: 0, + max: 59, + defaultList: genericDefaultList[0:60], + valuePattern: `[0-9]|[1-5][0-9]`, + atoi: atoi, + } + minuteDescriptor fieldDescriptor = fieldDescriptor{ + name: "minute", + min: 0, + max: 59, + defaultList: genericDefaultList[0:60], + valuePattern: `[0-9]|[1-5][0-9]`, + atoi: atoi, + } + hourDescriptor fieldDescriptor = fieldDescriptor{ + name: "hour", + min: 0, + max: 23, + defaultList: genericDefaultList[0:24], + valuePattern: `[0-9]|1[0-9]|2[0-3]`, + atoi: atoi, + } + domDescriptor fieldDescriptor = fieldDescriptor{ + name: "day-of-month", + min: 1, + max: 31, + defaultList: genericDefaultList[1:32], + valuePattern: `[1-9]|[12][0-9]|3[01]`, + atoi: atoi, + } + monthDescriptor fieldDescriptor = fieldDescriptor{ + name: "month", + min: 1, + max: 12, + defaultList: genericDefaultList[1:13], + valuePattern: `[1-9]|1[012]|jan|feb|mar|apr|may|jun|jul|aug|sep|oct|nov|dec|january|february|march|april|march|april|june|july|august|september|october|november|december`, + atoi: func(s string) int { + return monthTokens[s] + }, + } + dowDescriptor fieldDescriptor = fieldDescriptor{ + name: "day-of-week", + min: 0, + max: 6, + defaultList: genericDefaultList[0:7], + valuePattern: `[0-7]|sun|mon|tue|wed|thu|fri|sat|sunday|monday|tuesday|wednesday|thursday|friday|saturday`, + atoi: func(s string) int { + return dowTokens[s] + }, + } + yearDescriptor fieldDescriptor = fieldDescriptor{ + name: "year", + min: 1970, + max: 2099, + defaultList: yearDefaultList[:], + valuePattern: `19[789][0-9]|20[0-9]{2}`, + atoi: atoi, + } +) + +/******************************************************************************/ + +var ( + layoutDomValue string = `[1-9]|[12][0-9]|3[01]` + layoutDowValue string = `[0-7]|sun|mon|tue|wed|thu|fri|sat|sunday|monday|tuesday|wednesday|thursday|friday|saturday` + layoutWildcard string = `^\*|\?$` + layoutValue string = `^(%value%)$` + layoutRange string = `^(%value%)-(%value%)$` + layoutWildcardAndInterval string = `^\*/(\d+)$` + layoutValueAndInterval string = `^(%value%)/(\d+)$` + layoutRangeAndInterval string = `^(%value%)-(%value%)/(\d+)$` + layoutLastDom string = `^l$` + layoutWorkdom string = `^(%value%)w$` + layoutLastWorkdom string = `^lw$` + layoutDowOfLastWeek string = `^(%value%)l$` + layoutDowOfSpecificWeek string = `^(%value%)#(\d+)$` + + layoutRegexp map[string]*regexp.Regexp = make(map[string]*regexp.Regexp) + fieldFinder *regexp.Regexp = regexp.MustCompile(`\S+`) + entryFinder *regexp.Regexp = regexp.MustCompile(`[^,]+`) +) + +/******************************************************************************/ + +var cronNormalizer = strings.NewReplacer( + "@yearly", "0 0 0 1 1 * *", + "@annually", "0 0 0 1 1 * *", + "@monthly", "0 0 0 1 * * *", + "@weekly", "0 0 0 * * 0 *", + "@daily", "0 0 0 * * * *", + "@hourly", "0 0 * * * * *") + +/******************************************************************************/ + +func (expr *Expression) nextYear(t time.Time) time.Time { + // Find index at which item in list is greater or equal to + // candidate year + i := sort.SearchInts(expr.yearList, t.Year()+1) + if i == len(expr.yearList) { + return time.Time{} + } + // Year changed, need to recalculate actual days of month + expr.actualDaysOfMonthList = expr.calculateActualDaysOfMonth(expr.yearList[i], expr.monthList[0]) + if len(expr.actualDaysOfMonthList) == 0 { + return expr.nextMonth(time.Date( + expr.yearList[i], + time.Month(expr.monthList[0]), + 1, + expr.hourList[0], + expr.minuteList[0], + expr.secondList[0], + 0, + t.Location())) + } + return time.Date( + expr.yearList[i], + time.Month(expr.monthList[0]), + expr.actualDaysOfMonthList[0], + expr.hourList[0], + expr.minuteList[0], + expr.secondList[0], + 0, + t.Location()) +} + +/******************************************************************************/ + +func (expr *Expression) nextMonth(t time.Time) time.Time { + // Find index at which item in list is greater or equal to + // candidate month + i := sort.SearchInts(expr.monthList, int(t.Month())+1) + if i == len(expr.monthList) { + return expr.nextYear(t) + } + // Month changed, need to recalculate actual days of month + expr.actualDaysOfMonthList = expr.calculateActualDaysOfMonth(t.Year(), expr.monthList[i]) + if len(expr.actualDaysOfMonthList) == 0 { + return expr.nextMonth(time.Date( + t.Year(), + time.Month(expr.monthList[i]), + 1, + expr.hourList[0], + expr.minuteList[0], + expr.secondList[0], + 0, + t.Location())) + } + + return time.Date( + t.Year(), + time.Month(expr.monthList[i]), + expr.actualDaysOfMonthList[0], + expr.hourList[0], + expr.minuteList[0], + expr.secondList[0], + 0, + t.Location()) +} + +/******************************************************************************/ + +func workdayOfMonth(targetDom, lastDom time.Time) int { + dom := targetDom.Day() + dow := targetDom.Weekday() + // If saturday, then friday + if dow == time.Saturday { + if dom > 1 { + dom -= 1 + } else { + dom += 2 + } + // If sunday, then monday + } else if dow == time.Sunday { + if dom < lastDom.Day() { + dom += 1 + } else { + dom -= 2 + } + } + return dom +} + +func (expr *Expression) calculateActualDaysOfMonth(year, month int) []int { + actualDaysOfMonthMap := make(map[int]bool) + firstDayOfMonth := time.Date(year, time.Month(month), 1, 0, 0, 0, 0, time.UTC) + lastDayOfMonth := firstDayOfMonth.AddDate(0, 1, -1) + + // As per crontab man page (http://linux.die.net/man/5/crontab#): + // "The day of a command's execution can be specified by two + // "fields - day of month, and day of week. If both fields are + // "restricted (ie, aren't *), the command will be run when + // "either field matches the current time" + if expr.daysOfMonthRestricted || expr.daysOfWeekRestricted == false { + // Last day of month + if expr.lastDayOfMonth { + actualDaysOfMonthMap[lastDayOfMonth.Day()] = true + } + // Last work day of month + if expr.lastWorkdayOfMonth { + actualDaysOfMonthMap[workdayOfMonth(lastDayOfMonth, lastDayOfMonth)] = true + } + // Days of month + for v := range expr.daysOfMonth { + // Ignore days beyond end of month + if v <= lastDayOfMonth.Day() { + actualDaysOfMonthMap[v] = true + } + } + // Work days of month + // As per Wikipedia: month boundaries are not crossed. + for v := range expr.workdaysOfMonth { + // Ignore days beyond end of month + if v <= lastDayOfMonth.Day() { + actualDaysOfMonthMap[workdayOfMonth(firstDayOfMonth.AddDate(0, 0, v-1), lastDayOfMonth)] = true + } + } + } + + if expr.daysOfWeekRestricted { + // How far first sunday is from first day of month + offset := 7 - int(firstDayOfMonth.Weekday()) + // days of week + // offset : (7 - day_of_week_of_1st_day_of_month) + // target : 1 + (7 * week_of_month) + (offset + day_of_week) % 7 + for w := 0; w <= 4; w += 1 { + for v := range expr.daysOfWeek { + v := 1 + w*7 + (offset+v)%7 + if v <= lastDayOfMonth.Day() { + actualDaysOfMonthMap[v] = true + } + } + } + // days of week of specific week in the month + // offset : (7 - day_of_week_of_1st_day_of_month) + // target : 1 + (7 * week_of_month) + (offset + day_of_week) % 7 + for v := range expr.specificWeekDaysOfWeek { + v := 1 + 7*(v/7) + (offset+v)%7 + if v <= lastDayOfMonth.Day() { + actualDaysOfMonthMap[v] = true + } + } + // Last days of week of the month + lastWeekOrigin := firstDayOfMonth.AddDate(0, 1, -7) + offset = 7 - int(lastWeekOrigin.Weekday()) + for v := range expr.lastWeekDaysOfWeek { + v := lastWeekOrigin.Day() + (offset+v)%7 + if v <= lastDayOfMonth.Day() { + actualDaysOfMonthMap[v] = true + } + } + } + + return toList(actualDaysOfMonthMap) +} + +/******************************************************************************/ + +func (expr *Expression) nextDayOfMonth(t time.Time) time.Time { + // Find index at which item in list is greater or equal to + // candidate day of month + i := sort.SearchInts(expr.actualDaysOfMonthList, t.Day()+1) + if i == len(expr.actualDaysOfMonthList) { + return expr.nextMonth(t) + } + + return time.Date( + t.Year(), + t.Month(), + expr.actualDaysOfMonthList[i], + expr.hourList[0], + expr.minuteList[0], + expr.secondList[0], + 0, + t.Location()) +} + +/******************************************************************************/ + +func (expr *Expression) nextHour(t time.Time) time.Time { + // Find index at which item in list is greater or equal to + // candidate hour + i := sort.SearchInts(expr.hourList, t.Hour()+1) + if i == len(expr.hourList) { + return expr.nextDayOfMonth(t) + } + + return time.Date( + t.Year(), + t.Month(), + t.Day(), + expr.hourList[i], + expr.minuteList[0], + expr.secondList[0], + 0, + t.Location()) +} + +/******************************************************************************/ + +func (expr *Expression) nextMinute(t time.Time) time.Time { + // Find index at which item in list is greater or equal to + // candidate minute + i := sort.SearchInts(expr.minuteList, t.Minute()+1) + if i == len(expr.minuteList) { + return expr.nextHour(t) + } + + return time.Date( + t.Year(), + t.Month(), + t.Day(), + t.Hour(), + expr.minuteList[i], + expr.secondList[0], + 0, + t.Location()) +} + +/******************************************************************************/ + +func (expr *Expression) nextSecond(t time.Time) time.Time { + // nextSecond() assumes all other fields are exactly matched + // to the cron expression + + // Find index at which item in list is greater or equal to + // candidate second + i := sort.SearchInts(expr.secondList, t.Second()+1) + if i == len(expr.secondList) { + return expr.nextMinute(t) + } + + return time.Date( + t.Year(), + t.Month(), + t.Day(), + t.Hour(), + t.Minute(), + expr.secondList[i], + 0, + t.Location()) +} + +/******************************************************************************/ + +func (expr *Expression) secondFieldHandler(s string) error { + var err error + expr.secondList, err = genericFieldHandler(s, secondDescriptor) + return err +} + +/******************************************************************************/ + +func (expr *Expression) minuteFieldHandler(s string) error { + var err error + expr.minuteList, err = genericFieldHandler(s, minuteDescriptor) + return err +} + +/******************************************************************************/ + +func (expr *Expression) hourFieldHandler(s string) error { + var err error + expr.hourList, err = genericFieldHandler(s, hourDescriptor) + return err +} + +/******************************************************************************/ + +func (expr *Expression) monthFieldHandler(s string) error { + var err error + expr.monthList, err = genericFieldHandler(s, monthDescriptor) + return err +} + +/******************************************************************************/ + +func (expr *Expression) yearFieldHandler(s string) error { + var err error + expr.yearList, err = genericFieldHandler(s, yearDescriptor) + return err +} + +/******************************************************************************/ + +const ( + none = 0 + one = 1 + span = 2 + all = 3 +) + +type cronDirective struct { + kind int + first int + last int + step int + sbeg int + send int +} + +func genericFieldHandler(s string, desc fieldDescriptor) ([]int, error) { + directives, err := genericFieldParse(s, desc) + if err != nil { + return nil, err + } + values := make(map[int]bool) + for _, directive := range directives { + switch directive.kind { + case none: + return nil, fmt.Errorf("Syntax error in %s field: '%s'", desc.name, s[directive.sbeg:directive.send]) + case one: + populateOne(values, directive.first) + case span: + populateMany(values, directive.first, directive.last, directive.step) + case all: + return desc.defaultList, nil + } + } + return toList(values), nil +} + +func (expr *Expression) dowFieldHandler(s string) error { + expr.daysOfWeekRestricted = true + expr.daysOfWeek = make(map[int]bool) + expr.lastWeekDaysOfWeek = make(map[int]bool) + expr.specificWeekDaysOfWeek = make(map[int]bool) + + directives, err := genericFieldParse(s, dowDescriptor) + if err != nil { + return err + } + + for _, directive := range directives { + switch directive.kind { + case none: + sdirective := s[directive.sbeg:directive.send] + snormal := strings.ToLower(sdirective) + // `5L` + pairs := makeLayoutRegexp(layoutDowOfLastWeek, dowDescriptor.valuePattern).FindStringSubmatchIndex(snormal) + if len(pairs) > 0 { + populateOne(expr.lastWeekDaysOfWeek, dowDescriptor.atoi(snormal[pairs[2]:pairs[3]])) + } else { + // `5#3` + pairs := makeLayoutRegexp(layoutDowOfSpecificWeek, dowDescriptor.valuePattern).FindStringSubmatchIndex(snormal) + if len(pairs) > 0 { + populateOne(expr.specificWeekDaysOfWeek, (dowDescriptor.atoi(snormal[pairs[4]:pairs[5]])-1)*7+(dowDescriptor.atoi(snormal[pairs[2]:pairs[3]])%7)) + } else { + return fmt.Errorf("Syntax error in day-of-week field: '%s'", sdirective) + } + } + case one: + populateOne(expr.daysOfWeek, directive.first) + case span: + populateMany(expr.daysOfWeek, directive.first, directive.last, directive.step) + case all: + populateMany(expr.daysOfWeek, directive.first, directive.last, directive.step) + expr.daysOfWeekRestricted = false + } + } + return nil +} + +func (expr *Expression) domFieldHandler(s string) error { + expr.daysOfMonthRestricted = true + expr.lastDayOfMonth = false + expr.lastWorkdayOfMonth = false + expr.daysOfMonth = make(map[int]bool) // days of month map + expr.workdaysOfMonth = make(map[int]bool) // work days of month map + + directives, err := genericFieldParse(s, domDescriptor) + if err != nil { + return err + } + + for _, directive := range directives { + switch directive.kind { + case none: + sdirective := s[directive.sbeg:directive.send] + snormal := strings.ToLower(sdirective) + // `L` + if makeLayoutRegexp(layoutLastDom, domDescriptor.valuePattern).MatchString(snormal) { + expr.lastDayOfMonth = true + } else { + // `LW` + if makeLayoutRegexp(layoutLastWorkdom, domDescriptor.valuePattern).MatchString(snormal) { + expr.lastWorkdayOfMonth = true + } else { + // `15W` + pairs := makeLayoutRegexp(layoutWorkdom, domDescriptor.valuePattern).FindStringSubmatchIndex(snormal) + if len(pairs) > 0 { + populateOne(expr.workdaysOfMonth, domDescriptor.atoi(snormal[pairs[2]:pairs[3]])) + } else { + return fmt.Errorf("Syntax error in day-of-month field: '%s'", sdirective) + } + } + } + case one: + populateOne(expr.daysOfMonth, directive.first) + case span: + populateMany(expr.daysOfMonth, directive.first, directive.last, directive.step) + case all: + populateMany(expr.daysOfMonth, directive.first, directive.last, directive.step) + expr.daysOfMonthRestricted = false + } + } + return nil +} + +/******************************************************************************/ + +func genericFieldParse(s string, desc fieldDescriptor) ([]*cronDirective, error) { + // At least one entry must be present + indices := entryFinder.FindAllStringIndex(s, -1) + if len(indices) == 0 { + return nil, fmt.Errorf("%s field: missing directive", desc.name) + } + + directives := make([]*cronDirective, 0, len(indices)) + + for i := range indices { + directive := cronDirective{ + sbeg: indices[i][0], + send: indices[i][1], + } + snormal := strings.ToLower(s[indices[i][0]:indices[i][1]]) + // `*` + if makeLayoutRegexp(layoutWildcard, desc.valuePattern).MatchString(snormal) { + directive.kind = all + directive.first = desc.min + directive.last = desc.max + directive.step = 1 + directives = append(directives, &directive) + continue + } + // `5` + if makeLayoutRegexp(layoutValue, desc.valuePattern).MatchString(snormal) { + directive.kind = one + directive.first = desc.atoi(snormal) + directives = append(directives, &directive) + continue + } + // `5-20` + pairs := makeLayoutRegexp(layoutRange, desc.valuePattern).FindStringSubmatchIndex(snormal) + if len(pairs) > 0 { + directive.kind = span + directive.first = desc.atoi(snormal[pairs[2]:pairs[3]]) + directive.last = desc.atoi(snormal[pairs[4]:pairs[5]]) + directive.step = 1 + directives = append(directives, &directive) + continue + } + // `*/2` + pairs = makeLayoutRegexp(layoutWildcardAndInterval, desc.valuePattern).FindStringSubmatchIndex(snormal) + if len(pairs) > 0 { + directive.kind = span + directive.first = desc.min + directive.last = desc.max + directive.step = atoi(snormal[pairs[2]:pairs[3]]) + directives = append(directives, &directive) + continue + } + // `5/2` + pairs = makeLayoutRegexp(layoutValueAndInterval, desc.valuePattern).FindStringSubmatchIndex(snormal) + if len(pairs) > 0 { + directive.kind = span + directive.first = desc.atoi(snormal[pairs[2]:pairs[3]]) + directive.last = desc.max + directive.step = atoi(snormal[pairs[4]:pairs[5]]) + directives = append(directives, &directive) + continue + } + // `5-20/2` + pairs = makeLayoutRegexp(layoutRangeAndInterval, desc.valuePattern).FindStringSubmatchIndex(snormal) + if len(pairs) > 0 { + directive.kind = span + directive.first = desc.atoi(snormal[pairs[2]:pairs[3]]) + directive.last = desc.atoi(snormal[pairs[4]:pairs[5]]) + directive.step = atoi(snormal[pairs[6]:pairs[7]]) + directives = append(directives, &directive) + continue + } + // No behavior for this one, let caller deal with it + directive.kind = none + directives = append(directives, &directive) + } + return directives, nil +} + +/******************************************************************************/ + +func populateOne(values map[int]bool, v int) { + values[v] = true +} + +func populateMany(values map[int]bool, min, max, step int) { + for i := min; i <= max; i += step { + values[i] = true + } +} + +func toList(set map[int]bool) []int { + list := make([]int, len(set)) + i := 0 + for k := range set { + list[i] = k + i += 1 + } + sort.Ints(list) + return list +} + +/******************************************************************************/ + +func makeLayoutRegexp(layout, value string) *regexp.Regexp { + layout = strings.Replace(layout, `%value%`, value, -1) + re := layoutRegexp[layout] + if re == nil { + re = regexp.MustCompile(layout) + layoutRegexp[layout] = re + } + return re +} diff --git a/cronexpr_test.go b/cronexpr_test.go index 9fbe49c..32467fb 100644 --- a/cronexpr_test.go +++ b/cronexpr_test.go @@ -116,6 +116,51 @@ var crontests = []crontest{ }, }, + // Work day of month + { + "0 0 14W * *", + "Mon 2006-01-02 15:04", + []crontimes{ + {"2013-03-31 00:00:00", "Mon 2013-04-15 00:00"}, + {"2013-08-31 00:00:00", "Fri 2013-09-13 00:00"}, + }, + }, + + // Work day of month -- end of month + { + "0 0 30W * *", + "Mon 2006-01-02 15:04", + []crontimes{ + {"2013-03-02 00:00:00", "Fri 2013-03-29 00:00"}, + {"2013-06-02 00:00:00", "Fri 2013-06-28 00:00"}, + {"2013-09-02 00:00:00", "Mon 2013-09-30 00:00"}, + {"2013-11-02 00:00:00", "Fri 2013-11-29 00:00"}, + }, + }, + + // Last day of month + { + "0 0 L * *", + "Mon 2006-01-02 15:04", + []crontimes{ + {"2013-09-02 00:00:00", "Mon 2013-09-30 00:00"}, + {"2014-01-01 00:00:00", "Fri 2014-01-31 00:00"}, + {"2014-02-01 00:00:00", "Fri 2014-02-28 00:00"}, + {"2016-02-15 00:00:00", "Mon 2016-02-29 00:00"}, + }, + }, + + // Last work day of month + { + "0 0 LW * *", + "Mon 2006-01-02 15:04", + []crontimes{ + {"2013-09-02 00:00:00", "Mon 2013-09-30 00:00"}, + {"2013-11-02 00:00:00", "Fri 2013-11-29 00:00"}, + {"2014-08-15 00:00:00", "Fri 2014-08-29 00:00"}, + }, + }, + // TODO: more tests } @@ -123,7 +168,11 @@ func TestExpressions(t *testing.T) { for _, test := range crontests { for _, times := range test.times { from, _ := time.Parse("2006-01-02 15:04:05", times.from) - next := cronexpr.MustParse(test.expr).Next(from) + expr, err := cronexpr.Parse(test.expr) + if err != nil { + t.Errorf(`cronexpr.Parse("%s") returned "%s"`, test.expr, err.Error()) + } + next := expr.Next(from) nextstr := next.Format(test.layout) if nextstr != times.next { t.Errorf(`("%s").Next("%s") = "%s", got "%s"`, test.expr, times.from, times.next, nextstr)