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helpers.go
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helpers.go
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// Copyright 2020 ConsenSys Software Inc.
//
// 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 bavard
import (
"errors"
"strconv"
"strings"
"text/template"
)
// Template helpers (txt/template)
func helpers() template.FuncMap {
// functions used in template
return template.FuncMap{
"reverse": reverse,
"add": add,
"sub": sub,
"toLower": strings.ToLower,
"toUpper": strings.ToUpper,
"capitalize": strings.Title,
"dict": dict,
"mul2": mul2,
"mul": mul,
"div": div,
"divides": divides,
}
}
func reverse(input []int) []int {
toReturn := make([]int, len(input))
j := 0
for i := len(input) - 1; i >= 0; i-- {
toReturn[j] = input[i]
j++
}
return toReturn
}
func add(a, b int) int {
return a + b
}
func mul(a, b int) int {
return a * b
}
func sub(a, b int) int {
return a - b
}
func mul2(a int) int {
return a * 2
}
func div(a, b int) int {
return a / b
}
func dict(values ...interface{}) (map[string]interface{}, error) {
if len(values)%2 != 0 {
return nil, errors.New("invalid dict call")
}
dict := make(map[string]interface{}, len(values)/2)
for i := 0; i < len(values); i += 2 {
key, ok := values[i].(string)
if !ok {
return nil, errors.New("dict keys must be strings")
}
dict[key] = values[i+1]
}
return dict, nil
}
// return true if c1 divides c2, that is, c2 % c1 == 0
func divides(c1, c2 interface{}) bool {
switch cc1 := c1.(type) {
case int:
switch cc2 := c2.(type) {
case int:
return cc2%cc1 == 0
case string:
c2Int, err := strconv.Atoi(cc2)
if err != nil {
panic(err)
}
return c2Int%cc1 == 0
}
case string:
c1Int, err := strconv.Atoi(cc1)
if err != nil {
panic(err)
}
switch cc2 := c2.(type) {
case int:
return cc2%c1Int == 0
case string:
c2Int, err := strconv.Atoi(cc2)
if err != nil {
panic(err)
}
return c2Int%c1Int == 0
}
}
panic("unexpected type")
}