mirror of
https://github.com/gohugoio/hugo.git
synced 2024-12-26 01:33:14 +00:00
377 lines
9.3 KiB
Go
377 lines
9.3 KiB
Go
// Copyright 2017 The Hugo Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// 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 strings
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import (
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"errors"
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"fmt"
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"html/template"
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_strings "strings"
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"unicode/utf8"
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"github.com/spf13/cast"
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"github.com/spf13/hugo/deps"
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"github.com/spf13/hugo/helpers"
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)
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// New returns a new instance of the strings-namespaced template functions.
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func New(d *deps.Deps) *Namespace {
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return &Namespace{deps: d}
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}
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// Namespace provides template functions for the "strings" namespace.
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// Most functions mimic the Go stdlib, but the order of the parameters may be
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// different to ease their use in the Go template system.
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type Namespace struct {
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deps *deps.Deps
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}
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// CountRunes returns the number of runes in s, excluding whitepace.
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func (ns *Namespace) CountRunes(s interface{}) (int, error) {
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ss, err := cast.ToStringE(s)
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if err != nil {
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return 0, fmt.Errorf("Failed to convert content to string: %s", err)
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}
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counter := 0
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for _, r := range helpers.StripHTML(ss) {
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if !helpers.IsWhitespace(r) {
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counter++
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}
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}
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return counter, nil
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}
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// CountWords returns the approximate word count in s.
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func (ns *Namespace) CountWords(s interface{}) (int, error) {
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ss, err := cast.ToStringE(s)
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if err != nil {
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return 0, fmt.Errorf("Failed to convert content to string: %s", err)
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}
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counter := 0
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for _, word := range _strings.Fields(helpers.StripHTML(ss)) {
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runeCount := utf8.RuneCountInString(word)
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if len(word) == runeCount {
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counter++
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} else {
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counter += runeCount
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}
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}
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return counter, nil
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}
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// Chomp returns a copy of s with all trailing newline characters removed.
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func (ns *Namespace) Chomp(s interface{}) (template.HTML, error) {
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ss, err := cast.ToStringE(s)
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if err != nil {
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return "", err
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}
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return template.HTML(_strings.TrimRight(ss, "\r\n")), nil
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}
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// Contains reports whether substr is in s.
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func (ns *Namespace) Contains(s, substr interface{}) (bool, error) {
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ss, err := cast.ToStringE(s)
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if err != nil {
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return false, err
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}
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su, err := cast.ToStringE(substr)
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if err != nil {
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return false, err
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}
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return _strings.Contains(ss, su), nil
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}
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// ContainsAny reports whether any Unicode code points in chars are within s.
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func (ns *Namespace) ContainsAny(s, chars interface{}) (bool, error) {
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ss, err := cast.ToStringE(s)
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if err != nil {
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return false, err
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}
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sc, err := cast.ToStringE(chars)
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if err != nil {
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return false, err
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}
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return _strings.ContainsAny(ss, sc), nil
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}
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// HasPrefix tests whether the input s begins with prefix.
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func (ns *Namespace) HasPrefix(s, prefix interface{}) (bool, error) {
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ss, err := cast.ToStringE(s)
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if err != nil {
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return false, err
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}
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sx, err := cast.ToStringE(prefix)
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if err != nil {
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return false, err
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}
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return _strings.HasPrefix(ss, sx), nil
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}
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// HasSuffix tests whether the input s begins with suffix.
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func (ns *Namespace) HasSuffix(s, suffix interface{}) (bool, error) {
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ss, err := cast.ToStringE(s)
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if err != nil {
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return false, err
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}
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sx, err := cast.ToStringE(suffix)
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if err != nil {
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return false, err
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}
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return _strings.HasSuffix(ss, sx), nil
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}
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// Replace returns a copy of the string s with all occurrences of old replaced
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// with new.
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func (ns *Namespace) Replace(s, old, new interface{}) (string, error) {
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ss, err := cast.ToStringE(s)
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if err != nil {
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return "", err
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}
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so, err := cast.ToStringE(old)
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if err != nil {
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return "", err
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}
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sn, err := cast.ToStringE(new)
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if err != nil {
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return "", err
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}
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return _strings.Replace(ss, so, sn, -1), nil
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}
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// SliceString slices a string by specifying a half-open range with
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// two indices, start and end. 1 and 4 creates a slice including elements 1 through 3.
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// The end index can be omitted, it defaults to the string's length.
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func (ns *Namespace) SliceString(a interface{}, startEnd ...interface{}) (string, error) {
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aStr, err := cast.ToStringE(a)
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if err != nil {
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return "", err
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}
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var argStart, argEnd int
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argNum := len(startEnd)
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if argNum > 0 {
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if argStart, err = cast.ToIntE(startEnd[0]); err != nil {
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return "", errors.New("start argument must be integer")
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}
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}
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if argNum > 1 {
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if argEnd, err = cast.ToIntE(startEnd[1]); err != nil {
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return "", errors.New("end argument must be integer")
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}
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}
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if argNum > 2 {
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return "", errors.New("too many arguments")
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}
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asRunes := []rune(aStr)
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if argNum > 0 && (argStart < 0 || argStart >= len(asRunes)) {
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return "", errors.New("slice bounds out of range")
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}
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if argNum == 2 {
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if argEnd < 0 || argEnd > len(asRunes) {
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return "", errors.New("slice bounds out of range")
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}
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return string(asRunes[argStart:argEnd]), nil
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} else if argNum == 1 {
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return string(asRunes[argStart:]), nil
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} else {
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return string(asRunes[:]), nil
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}
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}
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// Split slices an input string into all substrings separated by delimiter.
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func (ns *Namespace) Split(a interface{}, delimiter string) ([]string, error) {
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aStr, err := cast.ToStringE(a)
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if err != nil {
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return []string{}, err
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}
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return _strings.Split(aStr, delimiter), nil
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}
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// Substr extracts parts of a string, beginning at the character at the specified
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// position, and returns the specified number of characters.
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//
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// It normally takes two parameters: start and length.
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// It can also take one parameter: start, i.e. length is omitted, in which case
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// the substring starting from start until the end of the string will be returned.
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//
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// To extract characters from the end of the string, use a negative start number.
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//
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// In addition, borrowing from the extended behavior described at http://php.net/substr,
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// if length is given and is negative, then that many characters will be omitted from
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// the end of string.
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func (ns *Namespace) Substr(a interface{}, nums ...interface{}) (string, error) {
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aStr, err := cast.ToStringE(a)
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if err != nil {
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return "", err
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}
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var start, length int
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asRunes := []rune(aStr)
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switch len(nums) {
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case 0:
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return "", errors.New("too less arguments")
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case 1:
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if start, err = cast.ToIntE(nums[0]); err != nil {
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return "", errors.New("start argument must be integer")
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}
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length = len(asRunes)
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case 2:
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if start, err = cast.ToIntE(nums[0]); err != nil {
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return "", errors.New("start argument must be integer")
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}
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if length, err = cast.ToIntE(nums[1]); err != nil {
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return "", errors.New("length argument must be integer")
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}
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default:
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return "", errors.New("too many arguments")
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}
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if start < -len(asRunes) {
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start = 0
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}
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if start > len(asRunes) {
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return "", fmt.Errorf("start position out of bounds for %d-byte string", len(aStr))
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}
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var s, e int
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if start >= 0 && length >= 0 {
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s = start
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e = start + length
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} else if start < 0 && length >= 0 {
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s = len(asRunes) + start - length + 1
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e = len(asRunes) + start + 1
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} else if start >= 0 && length < 0 {
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s = start
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e = len(asRunes) + length
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} else {
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s = len(asRunes) + start
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e = len(asRunes) + length
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}
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if s > e {
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return "", fmt.Errorf("calculated start position greater than end position: %d > %d", s, e)
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}
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if e > len(asRunes) {
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e = len(asRunes)
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}
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return string(asRunes[s:e]), nil
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}
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// Title returns a copy of the input s with all Unicode letters that begin words
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// mapped to their title case.
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func (ns *Namespace) Title(s interface{}) (string, error) {
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ss, err := cast.ToStringE(s)
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if err != nil {
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return "", err
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}
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return _strings.Title(ss), nil
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}
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// ToLower returns a copy of the input s with all Unicode letters mapped to their
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// lower case.
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func (ns *Namespace) ToLower(s interface{}) (string, error) {
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ss, err := cast.ToStringE(s)
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if err != nil {
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return "", err
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}
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return _strings.ToLower(ss), nil
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}
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// ToUpper returns a copy of the input s with all Unicode letters mapped to their
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// upper case.
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func (ns *Namespace) ToUpper(s interface{}) (string, error) {
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ss, err := cast.ToStringE(s)
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if err != nil {
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return "", err
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}
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return _strings.ToUpper(ss), nil
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}
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// Trim returns a string with all leading and trailing characters defined
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// contained in cutset removed.
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func (ns *Namespace) Trim(s, cutset interface{}) (string, error) {
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ss, err := cast.ToStringE(s)
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if err != nil {
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return "", err
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}
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sc, err := cast.ToStringE(cutset)
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if err != nil {
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return "", err
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}
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return _strings.Trim(ss, sc), nil
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}
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// TrimPrefix returns s without the provided leading prefix string. If s doesn't
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// start with prefix, s is returned unchanged.
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func (ns *Namespace) TrimPrefix(s, prefix interface{}) (string, error) {
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ss, err := cast.ToStringE(s)
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if err != nil {
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return "", err
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}
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sx, err := cast.ToStringE(prefix)
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if err != nil {
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return "", err
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}
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return _strings.TrimPrefix(ss, sx), nil
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}
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// TrimSuffix returns s without the provided trailing suffix string. If s
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// doesn't end with suffix, s is returned unchanged.
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func (ns *Namespace) TrimSuffix(s, suffix interface{}) (string, error) {
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ss, err := cast.ToStringE(s)
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if err != nil {
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return "", err
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}
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sx, err := cast.ToStringE(suffix)
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if err != nil {
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return "", err
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}
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return _strings.TrimSuffix(ss, sx), nil
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}
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