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string_repl.go
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// Copyright © 2017 Wei Shen <[email protected]>
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package main
import (
"bytes"
"fmt"
"path/filepath"
"regexp"
"strconv"
"strings"
)
var rePlaceHolder = regexp.MustCompile(`\{([^\}]*)\}`)
var reChars = regexp.MustCompile(`\d+|.`)
var reCharsCheck = regexp.MustCompile(`^(\d+)*.*$`)
func fillCommand(config Config, command string, chunk Chunk) (string, error) {
founds := rePlaceHolder.FindAllStringSubmatchIndex(command, -1)
if len(founds) == 0 {
return command, nil
}
records := make([]string, len(chunk.Data))
for i, r := range chunk.Data {
switch config.Trim {
case "l":
records[i] = strings.TrimLeft(r, " \t\r\n")
case "r":
records[i] = strings.TrimRight(r, " \t\r\n")
case "lr", "rl", "b":
records[i] = strings.Trim(r, " \t\r\n")
default:
records[i] = r
}
}
fieldsStr := strings.Join(records, config.RecordsJoinSeparator)
if fieldsStr == "" || fieldsStr == "\n" || fieldsStr == "\r\n" || fieldsStr == "\r" {
return "", nil
}
var fields []string
var chars, char, target string
var charsGroups []string
var i, j int
var buf bytes.Buffer
for _, found := range founds {
chars = command[found[2]:found[3]]
target = fieldsStr
if chars == "" {
target = fieldsStr
} else if chars == "#" {
target = fmt.Sprintf("%d", chunk.ID)
} else if !reCharsCheck.MatchString(chars) {
target = fmt.Sprintf("{%s}", chars)
} else {
if v, ok := config.AssignMap[chars]; ok { // key-value
target = v
} else {
charsGroups = reChars.FindAllString(chars, -1)
char = charsGroups[0]
if char[0] >= 48 && char[0] <= 57 { // digits, handle specific field
i, _ = strconv.Atoi(char)
if i == 0 {
target = fieldsStr
} else {
if len(fields) == 0 {
fields = config.reFieldDelimiter.Split(fieldsStr, -1)
}
if i > len(fields) {
i = len(fields)
}
target = fields[i-1]
}
i = 1
} else { // handle whole fieldStr
target = fieldsStr
i = 0
}
var x, y int
var rmSuffix bool
var captureGroup bool
var td, tb string
LOOP:
for x, char = range charsGroups[i:] {
switch char {
case "#": // job number
target = fmt.Sprintf("%d", chunk.ID)
if x == 0 && len(charsGroups[i:]) > 1 {
target = fmt.Sprintf("{%s}", chars)
}
break LOOP
case ".": // remove last extension of the basename
td = filepath.Dir(target)
tb = filepath.Base(target)
x = strings.LastIndex(tb, ".")
if x > 0 {
tb = tb[0:x]
}
target = filepath.Join(td, tb)
case ":": // remove any extension of the basename
td = filepath.Dir(target)
tb = filepath.Base(target)
x = strings.Index(tb, ".")
if x > 0 {
tb = tb[0:x]
}
target = filepath.Join(td, tb)
case "/": // dirname
target = filepath.Dir(target)
case "%": // basename
target = filepath.Base(target)
case "^": // remove suffix
rmSuffix = true
break LOOP
case "@": // capturing group
captureGroup = true
break LOOP
default:
target = fmt.Sprintf("{%s}", chars)
break LOOP
}
}
if rmSuffix {
y = strings.LastIndex(target, strings.Join(charsGroups[i:][x+1:], ""))
if y >= 0 {
target = target[0:y]
}
}
if captureGroup {
if len(charsGroups[i:]) == 1 {
continue
}
re, err := regexp.Compile(strings.Join(charsGroups[i:][x+1:], ""))
if err != nil {
return "", err
}
groups := re.FindStringSubmatch(target)
if len(groups) == 0 {
} else if len(groups) == 1 {
target = groups[0]
} else {
target = groups[1]
}
}
}
}
buf.WriteString(command[j:found[0]])
buf.WriteString(target)
j = found[3] + 1
}
buf.WriteString(command[j:])
if !config.Greedy || config.GreedyCount <= 0 {
return buf.String(), nil
}
config.GreedyCount--
return fillCommand(config, buf.String(), chunk)
}