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query.go
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query.go
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// Copyright (C) 2016 Constantin Schomburg <me@cschomburg.com>
//
// Use of this source code is governed by an MIT-style
// license that can be found in the LICENSE file.
package query
import (
"errors"
"fmt"
"strings"
"github.com/sarifsystems/sarif/pkg/natural"
"github.com/sarifsystems/sarif/pkg/natural/nlp"
)
type Parser struct {
KnownObjects map[string]string
tokenizer *nlp.Tokenizer
}
func NewParser() *Parser {
return &Parser{
KnownObjects: make(map[string]string),
tokenizer: nlp.NewTokenizer(),
}
}
var Projections = map[string]string{
"select": "list",
"which": "list",
"what": "list",
"who": "list",
"where": "list",
"show": "list",
"find": "list",
"list": "list",
"how": "count",
"many": "count",
"count": "count",
}
var Operators = map[string]string{
"=": "=",
"==": "==",
"!=": "!=",
">": ">",
"<": "<",
">=": ">=",
"<=": "<=",
"^": "^",
"$": "$",
"equal": "==",
"like": "==",
"not": "!",
"over": ">=",
"greater": ">=",
"after": ">=",
"lower": "<",
"before": "<",
"start": "^",
"starts": "^",
"starting": "^",
"end": "$",
"ends": "$",
"ending": "$",
}
var Modes = map[string]string{
"where": "select",
"with": "select",
"sort": "sort",
"sorted": "sort",
"order": "sort",
"ordered": "sort",
"group": "group",
"grouped": "group",
}
var Skipped = map[string]bool{
"with": true,
"than": true,
"in": true,
"to": true,
}
type Meaning struct {
Predicate string
Object string
Selections map[string]interface{}
}
func (m Meaning) String() string {
if m.Predicate == "" || m.Object == "" {
return ""
}
s := m.Predicate + " " + m.Object
if len(m.Selections) > 0 {
s += " where "
first := true
for attr, val := range m.Selections {
if !first {
s += " and "
}
v := fmt.Sprintf("%v", val)
if strings.Contains(v, " ") {
v = `"` + v + `"`
}
s += attr + " " + v
first = false
}
}
return s
}
func invert(op string) string {
switch op {
case "==":
return "!="
case "!=":
return "=="
case ">":
return "<="
case "<":
return ">="
case ">=":
return "<"
case "<=":
return ">"
case "!":
return ""
}
return op
}
func (p *Parser) Parse(ctx *natural.Context) (*natural.ParseResult, error) {
if ctx == nil {
ctx = &natural.Context{}
}
r := &natural.ParseResult{
Text: ctx.Text,
}
if ctx.Text == "" {
return r, nil
}
m := Meaning{
Selections: make(map[string]interface{}),
}
var mode, attr, op string
tokens := p.tokenizer.Tokenize(ctx.Text)
for i := 0; i < len(tokens); i++ {
tok := tokens[i]
// First part of sentence: find predicate and object
if m.Predicate == "" {
if p, ok := Projections[tok.Lemma]; ok {
m.Predicate = p
} else {
return r, errors.New("Expected projection instead of '" + tok.Value + "'")
}
}
if m.Object == "" {
if p, ok := Projections[tok.Lemma]; ok {
m.Predicate = p
} else {
m.Object = pluralize(tok.Lemma)
}
// TODO: handle limit
// TODO: handle "last"/"top"
continue
}
// Check for mode switches
if md, ok := Modes[tok.Lemma]; ok {
mode = md
continue
}
if tok.Lemma == "by" && mode != "group" {
mode = "sort"
continue
}
// Skip stop words
if ok := Skipped[tok.Lemma]; ok {
continue
}
if tok.Lemma == "," || tok.Lemma == "and" {
attr, op = "", ""
continue
}
// Parse attribute/values
// TODO: handle group/sort
if o, ok := Operators[tok.Lemma]; ok {
if op == "!" {
op = invert(o)
}
op = o
if attr == "" {
return r, errors.New("Unexpected operator '" + op + "', expecting attribute")
}
continue
}
if attr == "" {
attr = tok.Lemma
} else {
val := natural.ParseValue(tok.Value)
if op != "" && op != "==" {
attr = attr + " " + op
}
m.Selections[attr] = val
attr = ""
}
}
// Build intent from meaning
it := natural.Intent{
Type: "query",
Weight: 1,
ExtraInfo: m,
}
if action, ok := p.KnownObjects[m.Object]; ok {
it.Message.Action = action
it.Message.EncodePayload(m.Selections)
} else {
it.Message.Action = "store/scan/" + m.Object
it.Message.EncodePayload(map[string]interface{}{
"filter": m.Selections,
})
}
r.Text = m.String()
r.Intents = append(r.Intents, &it)
return r, nil
}
func (p *Parser) IsObjectKnown(object string) bool {
_, ok := p.KnownObjects[pluralize(object)]
return ok
}
func pluralize(object string) string {
return strings.Trim(object, "s") + "s"
}
func (p *Parser) RegisterObject(object, action string) {
p.KnownObjects[pluralize(object)] = action
}