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read.go
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read.go
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// Copyright 2013 Unknwon
//
// Licensed under the Apache License, Version 2.0 (the "License"): you may
// not use this file except in compliance with the License. You may obtain
// a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations
// under the License.
package goconfig
import (
"bufio"
"bytes"
"fmt"
"io"
"io/ioutil"
"os"
"path"
"strings"
"time"
)
// Read reads an io.Reader and returns a configuration representation.
// This representation can be queried with GetValue.
func (c *ConfigFile) read(reader io.Reader) (err error) {
buf := bufio.NewReader(reader)
count := 1 // Counter for auto increment.
// Current section name.
section := DEFAULT_SECTION
var comments string
// Parse line-by-line
for {
line, err := buf.ReadString('\n')
line = strings.TrimSpace(line)
lineLengh := len(line) //[SWH|+]
if err != nil {
if err != io.EOF {
return err
}
// Reached end of file, if nothing to read then break,
// otherwise handle the last line.
if lineLengh == 0 {
break
}
}
// switch written for readability (not performance)
switch {
case lineLengh == 0: // Empty line
continue
case line[0] == '#' || line[0] == ';': // Comment
// Append comments
if len(comments) == 0 {
comments = line
} else {
comments += LineBreak + line
}
continue
case line[0] == '[' && line[lineLengh-1] == ']': // New sction.
// Get section name.
section = strings.TrimSpace(line[1 : lineLengh-1])
// Set section comments and empty if it has comments.
if len(comments) > 0 {
c.SetSectionComments(section, comments)
comments = ""
}
// Make section exist even though it does not have any key.
c.SetValue(section, " ", " ")
// Reset counter.
count = 1
continue
case section == "": // No section defined so far
return readError{ErrBlankSectionName, line}
default: // Other alternatives
var (
i int
keyQuote string
key string
valQuote string
value string
)
//[SWH|+]:支持引号包围起来的字串
if line[0] == '"' {
if lineLengh >= 6 && line[0:3] == `"""` {
keyQuote = `"""`
} else {
keyQuote = `"`
}
} else if line[0] == '`' {
keyQuote = "`"
}
if keyQuote != "" {
qLen := len(keyQuote)
pos := strings.Index(line[qLen:], keyQuote)
if pos == -1 {
return readError{ErrCouldNotParse, line}
}
pos = pos + qLen
i = strings.IndexAny(line[pos:], "=:")
if i <= 0 {
return readError{ErrCouldNotParse, line}
}
i = i + pos
key = line[qLen:pos] //保留引号内的两端的空格
} else {
i = strings.IndexAny(line, "=:")
if i <= 0 {
return readError{ErrCouldNotParse, line}
}
key = strings.TrimSpace(line[0:i])
}
//[SWH|+];
// Check if it needs auto increment.
if key == "-" {
key = "#" + fmt.Sprint(count)
count++
}
//[SWH|+]:支持引号包围起来的字串
lineRight := strings.TrimSpace(line[i+1:])
lineRightLength := len(lineRight)
firstChar := ""
if lineRightLength >= 2 {
firstChar = lineRight[0:1]
}
if firstChar == "`" {
valQuote = "`"
} else if lineRightLength >= 6 && lineRight[0:3] == `"""` {
valQuote = `"""`
}
if valQuote != "" {
qLen := len(valQuote)
pos := strings.LastIndex(lineRight[qLen:], valQuote)
if pos == -1 {
return readError{ErrCouldNotParse, line}
}
pos = pos + qLen
value = lineRight[qLen:pos]
} else {
value = strings.TrimSpace(lineRight[0:])
}
//[SWH|+];
c.SetValue(section, key, value)
// Set key comments and empty if it has comments.
if len(comments) > 0 {
c.SetKeyComments(section, key, comments)
comments = ""
}
}
// Reached end of file.
if err == io.EOF {
break
}
}
return nil
}
// LoadFromData accepts raw data directly from memory
// and returns a new configuration representation.
func LoadFromData(data []byte) (c *ConfigFile, err error) {
// Save memory data to temporary file to support further operations.
tmpName := path.Join(os.TempDir(), "goconfig", fmt.Sprintf("%d", time.Now().Nanosecond()))
os.MkdirAll(path.Dir(tmpName), os.ModePerm)
if err = ioutil.WriteFile(tmpName, data, 0655); err != nil {
return nil, err
}
c = newConfigFile([]string{tmpName})
err = c.read(bytes.NewBuffer(data))
return c, err
}
func (c *ConfigFile) loadFile(fileName string) (err error) {
f, err := os.Open(fileName)
if err != nil {
return err
}
defer f.Close()
return c.read(f)
}
// LoadConfigFile reads a file and returns a new configuration representation.
// This representation can be queried with GetValue.
func LoadConfigFile(fileName string, moreFiles ...string) (c *ConfigFile, err error) {
// Append files' name together.
fileNames := make([]string, 1, len(moreFiles)+1)
fileNames[0] = fileName
if len(moreFiles) > 0 {
fileNames = append(fileNames, moreFiles...)
}
c = newConfigFile(fileNames)
for _, name := range fileNames {
if err = c.loadFile(name); err != nil {
return nil, err
}
}
return c, nil
}
// Reload reloads configuration file in case it has changes.
func (c *ConfigFile) Reload() (err error) {
var cfg *ConfigFile
if len(c.fileNames) == 1 {
cfg, err = LoadConfigFile(c.fileNames[0])
} else {
cfg, err = LoadConfigFile(c.fileNames[0], c.fileNames[1:]...)
}
if err == nil {
*c = *cfg
}
return err
}
// AppendFiles appends more files to ConfigFile and reload automatically.
func (c *ConfigFile) AppendFiles(files ...string) error {
c.fileNames = append(c.fileNames, files...)
return c.Reload()
}
// readError occurs when read configuration file with wrong format.
type readError struct {
Reason int
Content string // Line content
}
// Error implement Error interface.
func (err readError) Error() string {
switch err.Reason {
case ErrBlankSectionName:
return "empty section name not allowed"
case ErrCouldNotParse:
return fmt.Sprintf("could not parse line: %s", string(err.Content))
}
return "invalid read error"
}