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// Copyright 2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package dict implements the Dictionary Server Protocol
// as defined in RFC 2229.
package dict
import (
"container/vector"
"net/textproto"
"os"
"strconv"
"strings"
)
// A Client represents a client connection to a dictionary server.
type Client struct {
text *textproto.Conn
}
// Dial returns a new client connected to a dictionary server at
// addr on the given network.
func Dial(network, addr string) (*Client, os.Error) {
text, err := textproto.Dial(network, addr)
if err != nil {
return nil, err
}
_, _, err = text.ReadCodeLine(220)
if err != nil {
text.Close()
return nil, err
}
return &Client{text: text}, nil
}
// Close closes the connection to the dictionary server.
func (c *Client) Close() os.Error {
return c.text.Close()
}
// A Dict represents a dictionary available on the server.
type Dict struct {
Name string // short name of dictionary
Desc string // long description
}
// Dicts returns a list of the dictionaries available on the server.
func (c *Client) Dicts() ([]Dict, os.Error) {
id, err := c.text.Cmd("SHOW DB")
if err != nil {
return nil, err
}
c.text.StartResponse(id)
defer c.text.EndResponse(id)
_, _, err = c.text.ReadCodeLine(110)
if err != nil {
return nil, err
}
lines, err := c.text.ReadDotLines()
if err != nil {
return nil, err
}
_, _, err = c.text.ReadCodeLine(250)
dicts := make([]Dict, len(lines))
for i := range dicts {
d := &dicts[i]
a, _ := fields(lines[i])
if len(a) < 2 {
return nil, textproto.ProtocolError("invalid dictionary: " + lines[i])
}
d.Name = a[0]
d.Desc = a[1]
}
return dicts, err
}
// A Defn represents a definition.
type Defn struct {
Dict Dict // Dict where definition was found
Word string // Word being defined
Text []byte // Definition text, typically multiple lines
}
// Define requests the definition of the given word.
// The argument dict names the dictionary to use,
// the Name field of a Dict returned by Dicts.
//
// The special dictionary name "*" means to look in all the
// server's dictionaries.
// The special dictionary name "!" means to look in all the
// server's dictionaries in turn, stopping after finding the word
// in one of them.
func (c *Client) Define(dict, word string) ([]*Defn, os.Error) {
id, err := c.text.Cmd("DEFINE %s %q", dict, word)
if err != nil {
return nil, err
}
c.text.StartResponse(id)
defer c.text.EndResponse(id)
_, line, err := c.text.ReadCodeLine(150)
if err != nil {
return nil, err
}
a, _ := fields(line)
if len(a) < 1 {
return nil, textproto.ProtocolError("malformed response: " + line)
}
n, err := strconv.Atoi(a[0])
if err != nil {
return nil, textproto.ProtocolError("invalid definition count: " + a[0])
}
def := make([]*Defn, n)
for i := 0; i < n; i++ {
_, line, err = c.text.ReadCodeLine(151)
if err != nil {
return nil, err
}
a, _ := fields(line)
if len(a) < 3 {
// skip it, to keep protocol in sync
i--
n--
def = def[0:n]
continue
}
d := &Defn{Word: a[0], Dict: Dict{a[1], a[2]}}
d.Text, err = c.text.ReadDotBytes()
if err != nil {
return nil, err
}
def[i] = d
}
_, _, err = c.text.ReadCodeLine(250)
return def, err
}
// Fields returns the fields in s.
// Fields are space separated unquoted words
// or quoted with single or double quote.
func fields(s string) ([]string, os.Error) {
var v vector.StringVector
i := 0
for {
for i < len(s) && (s[i] == ' ' || s[i] == '\t') {
i++
}
if i >= len(s) {
break
}
if s[i] == '"' || s[i] == '\'' {
q := s[i]
// quoted string
var j int
for j = i + 1; ; j++ {
if j >= len(s) {
return nil, textproto.ProtocolError("malformed quoted string")
}
if s[j] == '\\' {
j++
continue
}
if s[j] == q {
j++
break
}
}
v.Push(unquote(s[i+1 : j-1]))
i = j
} else {
// atom
var j int
for j = i; j < len(s); j++ {
if s[j] == ' ' || s[j] == '\t' || s[j] == '\\' || s[j] == '"' || s[j] == '\'' {
break
}
}
v.Push(s[i:j])
i = j
}
if i < len(s) {
c := s[i]
if c != ' ' && c != '\t' {
return nil, textproto.ProtocolError("quotes not on word boundaries")
}
}
}
return v, nil
}
func unquote(s string) string {
if strings.Index(s, "\\") < 0 {
return s
}
b := []byte(s)
w := 0
for r := 0; r < len(b); r++ {
c := b[r]
if c == '\\' {
r++
c = b[r]
}
b[w] = c
w++
}
return string(b[0:w])
}
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