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package when
import (
"sort"
"time"
"github.com/olebedev/when/rules"
"github.com/olebedev/when/rules/br"
"github.com/olebedev/when/rules/common"
"github.com/olebedev/when/rules/en"
"github.com/olebedev/when/rules/nl"
"github.com/olebedev/when/rules/ru"
"github.com/pkg/errors"
)
// Parser is a struct which contains options
// rules, and middlewares to call
type Parser struct {
options *rules.Options
rules []rules.Rule
middleware []func(string) (string, error)
}
// Result is a struct which contains parsing meta-info
type Result struct {
// Index is a start index
Index int
// Text is a text found and processed
Text string
// Source is input string
Source string
// Time is an output time
Time time.Time
}
// Parse returns Result and error if any. If have not matches it returns nil, nil.
func (p *Parser) Parse(text string, base time.Time) (*Result, error) {
res := Result{
Source: text,
Time: base,
Index: -1,
}
if p.options == nil {
p.options = defaultOptions
}
var err error
// apply middlewares
for _, b := range p.middleware {
text, err = b(text)
if err != nil {
return nil, err
}
}
// find all matches
matches := make([]*rules.Match, 0)
c := float64(0)
for _, rule := range p.rules {
r := rule.Find(text)
if r != nil {
r.Order = c
c++
matches = append(matches, r)
}
}
// not found
if len(matches) == 0 {
return nil, nil
}
// find a cluster
sort.Sort(rules.MatchByIndex(matches))
// get borders of the matches
end := matches[0].Right
res.Index = matches[0].Left
for i, m := range matches {
if m.Left <= end+p.options.Distance {
end = m.Right
} else {
matches = matches[:i]
break
}
}
res.Text = text[res.Index:end]
// apply rules
if p.options.MatchByOrder {
sort.Sort(rules.MatchByOrder(matches))
}
ctx := &rules.Context{Text: res.Text}
applied := false
for _, applier := range matches {
ok, err := applier.Apply(ctx, p.options, res.Time)
if err != nil {
return nil, err
}
applied = ok || applied
}
if !applied {
return nil, nil
}
res.Time, err = ctx.Time(res.Time)
if err != nil {
return nil, errors.Wrap(err, "bind context")
}
return &res, nil
}
// Add adds given rules to the main chain.
func (p *Parser) Add(r ...rules.Rule) {
p.rules = append(p.rules, r...)
}
// Use adds give functions to middlewares.
func (p *Parser) Use(f ...func(string) (string, error)) {
p.middleware = append(p.middleware, f...)
}
// SetOptions sets options object to use.
func (p *Parser) SetOptions(o *rules.Options) {
p.options = o
}
// New returns Parser initialised with given options.
func New(o *rules.Options) *Parser {
if o == nil {
return &Parser{options: defaultOptions}
}
return &Parser{options: o}
}
// default options for internal usage
var defaultOptions = &rules.Options{
Distance: 5,
MatchByOrder: true,
}
// EN is a parser for English language
var EN *Parser
// RU is a parser for Russian language
var RU *Parser
// BR is a parser for Brazilian Portuguese language
var BR *Parser
// NL is a parser for Dutch language
var NL *Parser
func init() {
EN = New(nil)
EN.Add(en.All...)
EN.Add(common.All...)
RU = New(nil)
RU.Add(ru.All...)
RU.Add(common.All...)
BR = New(nil)
BR.Add(br.All...)
BR.Add(common.All...)
NL = New(nil)
NL.Add(nl.All...)
NL.Add(common.All...)
}
|
