Adding upstream version 2.5.1.
Signed-off-by: Daniel Baumann <daniel@debian.org>
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analysis/datetime/percent/percent.go
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analysis/datetime/percent/percent.go
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// Copyright (c) 2023 Couchbase, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package percent
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import (
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"fmt"
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"strings"
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"time"
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"github.com/blevesearch/bleve/v2/analysis"
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"github.com/blevesearch/bleve/v2/registry"
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)
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const Name = "percentstyle"
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var formatDelimiter byte = '%'
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// format specifiers as per strftime in the C standard library
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// https://man7.org/linux/man-pages/man3/strftime.3.html
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var formatSpecifierToLayout = map[byte]string{
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formatDelimiter: string(formatDelimiter), // %% = % (literal %)
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'a': "Mon", // %a = short weekday name
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'A': "Monday", // %A = full weekday name
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'd': "02", // %d = day of month (2 digits) (01-31)
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'e': "2", // %e = day of month (1 digit) (1-31)
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'b': "Jan", // %b = short month name
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'B': "January", // %B = full month name
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'm': "01", // %m = month of year (2 digits) (01-12)
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'y': "06", // %y = year without century
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'Y': "2006", // %Y = year with century
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'H': "15", // %H = hour (24 hour clock) (2 digits)
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'I': "03", // %I = hour (12 hour clock) (2 digits)
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'l': "3", // %l = hour (12 hour clock) (1 digit)
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'p': "PM", // %p = PM/AM
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'P': "pm", // %P = pm/am (lowercase)
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'M': "04", // %M = minute (2 digits)
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'S': "05", // %S = seconds (2 digits)
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'f': "999999", // .%f = fraction of seconds - up to microseconds (6 digits) - deci/milli/micro
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'Z': "MST", // %Z = timezone name (GMT, JST, UTC etc)
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// %z is present in timezone options
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// some additional options not in strftime to support additional options such as
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// disallow 0 padding in minute and seconds, nanosecond precision, etc
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'o': "1", // %o = month of year (1 digit) (1-12)
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'i': "4", // %i = minute (1 digit)
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's': "5", // %s = seconds (1 digit)
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'N': "999999999", // .%N = fraction of seconds - up to microseconds (9 digits) - milli/micro/nano
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}
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// some additional options for timezone
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// such as allowing colon in timezone offset and specifying the seconds
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// timezone offsets are from UTC
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var timezoneOptions = map[string]string{
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"z": "Z0700", // %z = timezone offset in +-hhmm / +-(2 digit hour)(2 digit minute) +0500, -0600 etc
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"z:M": "Z07:00", // %z:M = timezone offset(+-hh:mm) / +-(2 digit hour):(2 digit minute) +05:00, -06:00 etc
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"z:S": "Z07:00:00", // %z:M = timezone offset(+-hh:mm:ss) / +-(2 digit hour):(2 digit minute):(2 digit second) +05:20:00, -06:30:00 etc
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"zH": "Z07", // %zH = timezone offset(+-hh) / +-(2 digit hour) +05, -06 etc
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"zS": "Z070000", // %zS = timezone offset(+-hhmmss) / +-(2 digit hour)(2 digit minute)(2 digit second) +052000, -063000 etc
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}
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type DateTimeParser struct {
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layouts []string
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}
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func New(layouts []string) *DateTimeParser {
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return &DateTimeParser{
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layouts: layouts,
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}
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}
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func checkTZOptions(formatString string, idx int) (string, int) {
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// idx points to '%'
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// We know formatString[idx+1] == 'z'
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nextIdx := idx + 2 // Index of the character immediately after 'z'
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// Default values assume only '%z' is present
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layout := timezoneOptions["z"]
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finalIdx := nextIdx // Index after '%z'
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if nextIdx < len(formatString) {
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switch formatString[nextIdx] {
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case ':':
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// Check for modifier after the colon ':'
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colonModifierIdx := nextIdx + 1
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if colonModifierIdx < len(formatString) {
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switch formatString[colonModifierIdx] {
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case 'M':
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// Found %z:M
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layout = timezoneOptions["z:M"]
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finalIdx = colonModifierIdx + 1 // Index after %z:M
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case 'S':
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// Found %z:S
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layout = timezoneOptions["z:S"]
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finalIdx = colonModifierIdx + 1 // Index after %z:S
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// default: If %z: is followed by something else, or just %z: at the end.
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// Keep the default layout ("z") and finalIdx (idx + 2).
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// The ':' will be treated as a literal by the main loop.
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}
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}
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// else: %z: is at the very end of the string.
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// Keep the default layout ("z") and finalIdx (idx + 2).
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// The ':' will be treated as a literal by the main loop.
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case 'H':
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// Found %zH
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layout = timezoneOptions["zH"]
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finalIdx = nextIdx + 1 // Index after %zH
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case 'S':
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// Found %zS
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layout = timezoneOptions["zS"]
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finalIdx = nextIdx + 1 // Index after %zS
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// default: If %z is followed by something other than ':', 'H', or 'S'.
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// Keep the default layout ("z") and finalIdx (idx + 2).
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// The character formatString[nextIdx] will be handled by the main loop.
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}
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}
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// else: %z is at the very end of the string.
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// Keep the default layout ("z") and finalIdx (idx + 2).
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return layout, finalIdx
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}
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func parseFormatString(formatString string) (string, error) {
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var dateTimeLayout strings.Builder
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// iterate over the format string and replace the format specifiers with
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// the corresponding golang constants
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for idx := 0; idx < len(formatString); {
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// check if the character is a format delimiter (%)
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if formatString[idx] == formatDelimiter {
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// check if there is a character after the format delimiter (%)
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if idx+1 >= len(formatString) {
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return "", fmt.Errorf("invalid format string, expected character after %s", string(formatDelimiter))
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}
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formatSpecifier := formatString[idx+1]
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if layout, ok := formatSpecifierToLayout[formatSpecifier]; ok {
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dateTimeLayout.WriteString(layout)
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idx += 2
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} else if formatSpecifier == 'z' {
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// did not find a valid specifier
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// check if it is for timezone
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var tzLayout string
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tzLayout, idx = checkTZOptions(formatString, idx)
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dateTimeLayout.WriteString(tzLayout)
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} else {
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return "", fmt.Errorf("invalid format string, unknown format specifier: %s", string(formatSpecifier))
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}
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continue
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}
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// copy the character as is
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dateTimeLayout.WriteByte(formatString[idx])
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idx++
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}
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return dateTimeLayout.String(), nil
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}
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func (p *DateTimeParser) ParseDateTime(input string) (time.Time, string, error) {
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for _, layout := range p.layouts {
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rv, err := time.Parse(layout, input)
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if err == nil {
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return rv, layout, nil
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}
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}
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return time.Time{}, "", analysis.ErrInvalidDateTime
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}
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func DateTimeParserConstructor(config map[string]interface{}, cache *registry.Cache) (analysis.DateTimeParser, error) {
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layouts, ok := config["layouts"].([]interface{})
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if !ok {
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return nil, fmt.Errorf("must specify layouts")
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}
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layoutStrs := make([]string, 0, len(layouts))
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for _, layout := range layouts {
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layoutStr, ok := layout.(string)
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if ok {
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layout, err := parseFormatString(layoutStr)
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if err != nil {
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return nil, err
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}
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layoutStrs = append(layoutStrs, layout)
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}
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}
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return New(layoutStrs), nil
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}
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func init() {
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err := registry.RegisterDateTimeParser(Name, DateTimeParserConstructor)
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if err != nil {
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panic(err)
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}
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}
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