/
csv.go
120 lines (114 loc) · 3.04 KB
/
csv.go
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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()
}