134 lines
3.6 KiB
Go
134 lines
3.6 KiB
Go
// Copyright © 2010-12 Qtrac Ltd.
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//
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// This program or package and any associated files are licensed under the
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// Apache License, Version 2.0 (the "License"); you may not use these files
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// except in compliance with the License. You can get a copy of the License
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// at: 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 main
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import (
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"bufio"
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"fmt"
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"io"
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"io/ioutil"
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"log"
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"os"
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"path/filepath"
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"regexp"
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"strings"
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)
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var britishAmerican = "british-american.txt"
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func init() {
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dir, _ := filepath.Split(os.Args[0])
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britishAmerican = filepath.Join(dir, britishAmerican)
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}
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func main() {
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inFilename, outFilename, err := filenamesFromCommandLine()
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if err != nil {
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fmt.Println(err)
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os.Exit(1)
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}
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inFile, outFile := os.Stdin, os.Stdout
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if inFilename != "" {
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if inFile, err = os.Open(inFilename); err != nil {
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log.Fatal(err)
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}
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defer inFile.Close()
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}
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if outFilename != "" {
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if outFile, err = os.Create(outFilename); err != nil {
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log.Fatal(err)
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}
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defer outFile.Close()
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}
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if err = americanise(inFile, outFile); err != nil {
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log.Fatal(err)
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}
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}
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func filenamesFromCommandLine() (inFilename, outFilename string,
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err error) {
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if len(os.Args) > 1 && (os.Args[1] == "-h" || os.Args[1] == "--help") {
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err = fmt.Errorf("usage: %s [<]infile.txt [>]outfile.txt",
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filepath.Base(os.Args[0]))
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return "", "", err
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}
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if len(os.Args) > 1 {
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inFilename = os.Args[1]
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if len(os.Args) > 2 {
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outFilename = os.Args[2]
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}
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}
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if inFilename != "" && inFilename == outFilename {
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log.Fatal("won't overwrite the infile")
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}
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return inFilename, outFilename, nil
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}
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func americanise(inFile io.Reader, outFile io.Writer) (err error) {
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reader := bufio.NewReader(inFile)
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writer := bufio.NewWriter(outFile)
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defer func() {
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if err == nil {
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err = writer.Flush()
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}
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}()
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var replacer func(string) string
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if replacer, err = makeReplacerFunction(britishAmerican); err != nil {
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return err
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}
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wordRx := regexp.MustCompile("[A-Za-z]+")
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eof := false
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for !eof {
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var line string
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line, err = reader.ReadString('\n')
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if err == io.EOF {
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err = nil // io.EOF isn't really an error
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eof = true // this will end the loop at the next iteration
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} else if err != nil {
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return err // finish immediately for real errors
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}
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line = wordRx.ReplaceAllStringFunc(line, replacer)
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if _, err = writer.WriteString(line); err != nil {
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return err
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}
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}
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return nil
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}
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func makeReplacerFunction(file string) (func(string) string, error) {
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rawBytes, err := ioutil.ReadFile(file)
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if err != nil {
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return nil, err
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}
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text := string(rawBytes)
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usForBritish := make(map[string]string)
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lines := strings.Split(text, "\n")
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for _, line := range lines {
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fields := strings.Fields(line)
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if len(fields) == 2 {
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usForBritish[fields[0]] = fields[1]
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}
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}
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return func(word string) string {
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if usWord, found := usForBritish[word]; found {
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return usWord
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}
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return word
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}, nil
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}
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