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- // Copyright 2021 gorse Project Authors
- //
- // 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 base
- import (
- "bufio"
- "fmt"
- "strings"
- )
- // ValidateId validates user/item id. Id cannot be empty and contain [/,].
- func ValidateId(text string) error {
- text = strings.TrimSpace(text)
- if text == "" {
- return fmt.Errorf("id cannot be empty")
- } else if strings.Contains(text, "/") {
- return fmt.Errorf("id cannot contain `/`")
- }
- return nil
- }
- // ValidateLabel validates label. Label cannot be empty and contain [/,|].
- func ValidateLabel(text string) error {
- text = strings.TrimSpace(text)
- if text == "" {
- return fmt.Errorf("label cannot be empty")
- } else if strings.Contains(text, "/") {
- return fmt.Errorf("label cannot contain `/`")
- } else if strings.Contains(text, "|") {
- return fmt.Errorf("label cannot contain `|`")
- }
- return nil
- }
- // Escape text for csv.
- func Escape(text string) string {
- // check if need escape
- if !strings.Contains(text, ",") &&
- !strings.Contains(text, "\"") &&
- !strings.Contains(text, "\n") &&
- !strings.Contains(text, "\r") {
- return text
- }
- // start to encode
- builder := strings.Builder{}
- builder.WriteRune('"')
- for _, c := range text {
- if c == '"' {
- builder.WriteString("\"\"")
- } else {
- builder.WriteRune(c)
- }
- }
- builder.WriteRune('"')
- return builder.String()
- }
- // ReadLines parse fields of each line for csv file.
- func ReadLines(sc *bufio.Scanner, sep string, handler func(int, []string) bool) error {
- lineCount := 0 // line number of current position
- fields := make([]string, 0) // fields for current line
- builder := strings.Builder{} // string builder for current field
- quoted := false // whether current position in quote
- for sc.Scan() {
- // read line
- lineStr := sc.Text()
- line := []rune(lineStr)
- // start of line
- if quoted {
- builder.WriteString("\r\n")
- }
- // parse line
- for i := 0; i < len(line); i++ {
- if string(line[i]) == sep && !quoted {
- // end of field
- fields = append(fields, builder.String())
- builder.Reset()
- } else if line[i] == '"' {
- if quoted {
- if i+1 >= len(line) || line[i+1] != '"' {
- // end of quoted
- quoted = false
- } else {
- i++
- builder.WriteRune('"')
- }
- } else {
- // start of quoted
- quoted = true
- }
- } else {
- builder.WriteRune(line[i])
- }
- }
- // end of line
- if !quoted {
- fields = append(fields, builder.String())
- builder.Reset()
- if !handler(lineCount, fields) {
- return nil
- }
- fields = []string{}
- }
- // increase line count
- lineCount++
- }
- return sc.Err()
- }
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