From 5e4dc87ffec7f87bbf3ebfcf256777ad773e8450 Mon Sep 17 00:00:00 2001
From: Michael Muré <batolettre@gmail.com>
Date: Sat, 14 Mar 2020 16:47:38 +0100
Subject: cache: replace the all-in-one query parser by a complete one with
 AST/lexer/parser

---
 cache/query.go | 172 ---------------------------------------------------------
 1 file changed, 172 deletions(-)
 delete mode 100644 cache/query.go

(limited to 'cache/query.go')

diff --git a/cache/query.go b/cache/query.go
deleted file mode 100644
index 967c18d6..00000000
--- a/cache/query.go
+++ /dev/null
@@ -1,172 +0,0 @@
-package cache
-
-import (
-	"fmt"
-	"strings"
-	"unicode"
-)
-
-type Query struct {
-	Filters
-	OrderBy
-	OrderDirection
-}
-
-// Return an identity query with default sorting (creation-desc)
-func NewQuery() *Query {
-	return &Query{
-		OrderBy:        OrderByCreation,
-		OrderDirection: OrderDescending,
-	}
-}
-
-// ParseQuery parse a query DSL
-//
-// Ex: "status:open author:descartes sort:edit-asc"
-//
-// Supported filter qualifiers and syntax are described in docs/queries.md
-func ParseQuery(query string) (*Query, error) {
-	fields := splitQuery(query)
-
-	result := &Query{
-		OrderBy:        OrderByCreation,
-		OrderDirection: OrderDescending,
-	}
-
-	sortingDone := false
-
-	for _, field := range fields {
-		split := strings.Split(field, ":")
-		if len(split) != 2 {
-			return nil, fmt.Errorf("can't parse \"%s\"", field)
-		}
-
-		qualifierName := split[0]
-		qualifierQuery := removeQuote(split[1])
-
-		switch qualifierName {
-		case "status", "state":
-			f, err := StatusFilter(qualifierQuery)
-			if err != nil {
-				return nil, err
-			}
-			result.Status = append(result.Status, f)
-
-		case "author":
-			f := AuthorFilter(qualifierQuery)
-			result.Author = append(result.Author, f)
-
-		case "actor":
-			f := ActorFilter(qualifierQuery)
-			result.Actor = append(result.Actor, f)
-
-		case "participant":
-			f := ParticipantFilter(qualifierQuery)
-			result.Participant = append(result.Participant, f)
-
-		case "label":
-			f := LabelFilter(qualifierQuery)
-			result.Label = append(result.Label, f)
-
-		case "title":
-			f := TitleFilter(qualifierQuery)
-			result.Title = append(result.Title, f)
-
-		case "no":
-			err := result.parseNoFilter(qualifierQuery)
-			if err != nil {
-				return nil, err
-			}
-
-		case "sort":
-			if sortingDone {
-				return nil, fmt.Errorf("multiple sorting")
-			}
-
-			err := result.parseSorting(qualifierQuery)
-			if err != nil {
-				return nil, err
-			}
-
-			sortingDone = true
-
-		default:
-			return nil, fmt.Errorf("unknown qualifier name %s", qualifierName)
-		}
-	}
-
-	return result, nil
-}
-
-func splitQuery(query string) []string {
-	lastQuote := rune(0)
-	f := func(c rune) bool {
-		switch {
-		case c == lastQuote:
-			lastQuote = rune(0)
-			return false
-		case lastQuote != rune(0):
-			return false
-		case unicode.In(c, unicode.Quotation_Mark):
-			lastQuote = c
-			return false
-		default:
-			return unicode.IsSpace(c)
-		}
-	}
-
-	return strings.FieldsFunc(query, f)
-}
-
-func removeQuote(field string) string {
-	if len(field) >= 2 {
-		if field[0] == '"' && field[len(field)-1] == '"' {
-			return field[1 : len(field)-1]
-		}
-	}
-	return field
-}
-
-func (q *Query) parseNoFilter(query string) error {
-	switch query {
-	case "label":
-		q.NoFilters = append(q.NoFilters, NoLabelFilter())
-	default:
-		return fmt.Errorf("unknown \"no\" filter %s", query)
-	}
-
-	return nil
-}
-
-func (q *Query) parseSorting(query string) error {
-	switch query {
-	// default ASC
-	case "id-desc":
-		q.OrderBy = OrderById
-		q.OrderDirection = OrderDescending
-	case "id", "id-asc":
-		q.OrderBy = OrderById
-		q.OrderDirection = OrderAscending
-
-	// default DESC
-	case "creation", "creation-desc":
-		q.OrderBy = OrderByCreation
-		q.OrderDirection = OrderDescending
-	case "creation-asc":
-		q.OrderBy = OrderByCreation
-		q.OrderDirection = OrderAscending
-
-	// default DESC
-	case "edit", "edit-desc":
-		q.OrderBy = OrderByEdit
-		q.OrderDirection = OrderDescending
-	case "edit-asc":
-		q.OrderBy = OrderByEdit
-		q.OrderDirection = OrderAscending
-
-	default:
-		return fmt.Errorf("unknown sorting %s", query)
-	}
-
-	return nil
-}
-- 
cgit