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133 lines
2.9 KiB
Go
133 lines
2.9 KiB
Go
// Copyright (c) 2018 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 stempel
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import (
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"fmt"
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"github.com/blevesearch/stempel/javadata"
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)
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// trie represents the internal trie structure
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type trie struct {
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rows []*row
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cmds []string
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root int32
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forward bool
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}
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func newTrie(r *javadata.Reader) (rv *trie, err error) {
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rv = &trie{}
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rv.forward, err = r.ReadBool()
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if err != nil {
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return nil, fmt.Errorf("error reading trie forward: %v", err)
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}
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rv.root, err = r.ReadInt32()
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if err != nil {
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return nil, fmt.Errorf("error reading trie root: %v", err)
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}
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// commands
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nCommands, err := r.ReadInt32()
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if err != nil {
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return nil, fmt.Errorf("error reading trie num commands: %v", err)
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}
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for nCommands > 0 {
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utfCommand, nerr := r.ReadUTF()
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if nerr != nil {
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return nil, fmt.Errorf("error reading trie command utf: %v", nerr)
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}
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rv.cmds = append(rv.cmds, utfCommand)
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nCommands--
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}
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// rows
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nRows, err := r.ReadInt32()
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if err != nil {
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return nil, fmt.Errorf("error reading trie num rows: %v", err)
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}
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for nRows > 0 {
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row, err := newRow(r)
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if err != nil {
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return nil, fmt.Errorf("error reading trie row: %v", err)
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}
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rv.rows = append(rv.rows, row)
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nRows--
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}
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return rv, nil
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}
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func (t *trie) getRow(i int) *row {
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if i < 0 || i >= len(t.rows) {
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return nil
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}
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return t.rows[i]
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}
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func (t *trie) GetLastOnPath(key []rune) []rune {
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now := t.getRow(int(t.root))
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var last []rune
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var w int32
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e := newStrEnum(key, t.forward)
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// walk over each rune
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// if rune has row in the table, note the cmd (as last)
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// if rune has row in table, see if it transitions to another row
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// if it does, move to that row and next char on next loop itr
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// if it does not, return the last cmd
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// if you get to end of string and there is command in row use it
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// or return last
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for i := 0; i < len(key)-1; i++ {
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r, err := e.next()
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if err != nil {
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return last
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}
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w = now.getCmd(r)
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if w >= 0 {
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last = []rune(t.cmds[w])
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}
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w = now.getRef(r)
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if w >= 0 {
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now = t.getRow(int(w))
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} else {
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return last
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}
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}
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r, err := e.next()
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if err != nil {
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return last
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}
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w = now.getCmd(r)
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if err != nil {
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return last
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}
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if w >= 0 {
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return []rune(t.cmds[w])
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}
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return last
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}
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func (t *trie) String() string {
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rv := ""
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for _, cmd := range t.cmds {
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rv += fmt.Sprintf("cmd: %s\n", string(cmd))
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}
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for _, row := range t.rows {
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rv += fmt.Sprintf("row: %v\n", row)
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}
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return rv
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}
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