1 files changed, 152 insertions, 0 deletions
diff --git a/vendor/github.com/rickb777/date/period/parse.go b/vendor/github.com/rickb777/date/period/parse.go
new file mode 100644
index 00000000..30b3a693
--- /dev/null
+++ b/vendor/github.com/rickb777/date/period/parse.go
@@ -0,0 +1,152 @@
+// Copyright 2015 Rick Beton. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package period
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+)
+
+// MustParse is as per Parse except that it panics if the string cannot be parsed.
+// This is intended for setup code; don't use it for user inputs.
+func MustParse(value string) Period {
+	d, err := Parse(value)
+	if err != nil {
+		panic(err)
+	}
+	return d
+}
+
+// Parse parses strings that specify periods using ISO-8601 rules.
+//
+// In addition, a plus or minus sign can precede the period, e.g. "-P10D"
+//
+// The value is normalised, e.g. multiple of 12 months become years so "P24M"
+// is the same as "P2Y". However, this is done without loss of precision, so
+// for example whole numbers of days do not contribute to the months tally
+// because the number of days per month is variable.
+//
+// The zero value can be represented in several ways: all of the following
+// are equivalent: "P0Y", "P0M", "P0W", "P0D", "PT0H", PT0M", PT0S", and "P0".
+// The canonical zero is "P0D".
+func Parse(period string) (Period, error) {
+	if period == "" {
+		return Period{}, fmt.Errorf("cannot parse a blank string as a period")
+	}
+
+	if period == "P0" {
+		return Period{}, nil
+	}
+
+	result := period64{}
+	pcopy := period
+	if pcopy[0] == '-' {
+		result.neg = true
+		pcopy = pcopy[1:]
+	} else if pcopy[0] == '+' {
+		pcopy = pcopy[1:]
+	}
+
+	if pcopy[0] != 'P' {
+		return Period{}, fmt.Errorf("expected 'P' period mark at the start: %s", period)
+	}
+	pcopy = pcopy[1:]
+
+	st := parseState{period, pcopy, false, nil}
+	t := strings.IndexByte(pcopy, 'T')
+	if t >= 0 {
+		st.pcopy = pcopy[t+1:]
+
+		result.hours, st = parseField(st, 'H')
+		if st.err != nil {
+			return Period{}, fmt.Errorf("expected a number before the 'H' marker: %s", period)
+		}
+
+		result.minutes, st = parseField(st, 'M')
+		if st.err != nil {
+			return Period{}, fmt.Errorf("expected a number before the 'M' marker: %s", period)
+		}
+
+		result.seconds, st = parseField(st, 'S')
+		if st.err != nil {
+			return Period{}, fmt.Errorf("expected a number before the 'S' marker: %s", period)
+		}
+
+		st.pcopy = pcopy[:t]
+	}
+
+	result.years, st = parseField(st, 'Y')
+	if st.err != nil {
+		return Period{}, fmt.Errorf("expected a number before the 'Y' marker: %s", period)
+	}
+
+	result.months, st = parseField(st, 'M')
+	if st.err != nil {
+		return Period{}, fmt.Errorf("expected a number before the 'M' marker: %s", period)
+	}
+
+	weeks, st := parseField(st, 'W')
+	if st.err != nil {
+		return Period{}, fmt.Errorf("expected a number before the 'W' marker: %s", period)
+	}
+
+	days, st := parseField(st, 'D')
+	if st.err != nil {
+		return Period{}, fmt.Errorf("expected a number before the 'D' marker: %s", period)
+	}
+
+	result.days = weeks*7 + days
+	//fmt.Printf("%#v\n", st)
+
+	if !st.ok {
+		return Period{}, fmt.Errorf("expected 'Y', 'M', 'W', 'D', 'H', 'M', or 'S' marker: %s", period)
+	}
+
+	return result.normalise64(true).toPeriod(), nil
+}
+
+type parseState struct {
+	period, pcopy string
+	ok            bool
+	err           error
+}
+
+func parseField(st parseState, mark byte) (int64, parseState) {
+	//fmt.Printf("%c %#v\n", mark, st)
+	r := int64(0)
+	m := strings.IndexByte(st.pcopy, mark)
+	if m > 0 {
+		r, st.err = parseDecimalFixedPoint(st.pcopy[:m], st.period)
+		if st.err != nil {
+			return 0, st
+		}
+		st.pcopy = st.pcopy[m+1:]
+		st.ok = true
+	}
+	return r, st
+}
+
+// Fixed-point three decimal places
+func parseDecimalFixedPoint(s, original string) (int64, error) {
+	//was := s
+	dec := strings.IndexByte(s, '.')
+	if dec < 0 {
+		dec = strings.IndexByte(s, ',')
+	}
+
+	if dec >= 0 {
+		dp := len(s) - dec
+		if dp > 1 {
+			s = s[:dec] + s[dec+1:dec+2]
+		} else {
+			s = s[:dec] + s[dec+1:] + "0"
+		}
+	} else {
+		s = s + "0"
+	}
+
+	return strconv.ParseInt(s, 10, 64)
+}