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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2015-2018 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package testutil
import (
"fmt"
"regexp"
"strings"
"gopkg.in/check.v1"
)
type paddedChecker struct {
*check.CheckerInfo
isRegexp bool
isPartial bool
isLine bool
}
// EqualsPadded is a Checker that looks for an expected string to
// be equal to another except that the other might have been padded
// out to align with something else (so arbitrary amounts of
// horizontal whitespace is ok at the ends, and between non-whitespace
// bits).
var EqualsPadded = &paddedChecker{
CheckerInfo: &check.CheckerInfo{Name: "EqualsPadded", Params: []string{"padded", "expected"}},
isLine: true,
}
// MatchesPadded is a Checker that looks for an expected regexp in
// a string that might have been padded out to align with something
// else (so whitespace in the regexp is changed to [ \t]+, and ^[ \t]*
// is added to the beginning, and [ \t]*$ to the end of it).
var MatchesPadded = &paddedChecker{
CheckerInfo: &check.CheckerInfo{Name: "MatchesPadded", Params: []string{"padded", "expected"}},
isRegexp: true,
isLine: true,
}
// ContainsPadded is a Checker that looks for an expected string
// in another that might have been padded out to align with something
// else (so arbitrary amounts of horizontal whitespace is ok between
// non-whitespace bits).
var ContainsPadded = &paddedChecker{
CheckerInfo: &check.CheckerInfo{Name: "ContainsPadded", Params: []string{"padded", "expected"}},
isPartial: true,
isLine: true,
}
// EqualsWrapped is a Checker that looks for an expected string to be
// equal to another except that the other might have been padded out
// and wrapped (so arbitrary amounts of whitespace is ok at the ends,
// and between non-whitespace bits).
var EqualsWrapped = &paddedChecker{
CheckerInfo: &check.CheckerInfo{Name: "EqualsWrapped", Params: []string{"wrapped", "expected"}},
}
// MatchesWrapped is a Checker that looks for an expected regexp in a
// string that might have been padded and wrapped (so whitespace in
// the regexp is changed to \s+, and (?s)^\s* is added to the
// beginning, and \s*$ to the end of it).
var MatchesWrapped = &paddedChecker{
CheckerInfo: &check.CheckerInfo{Name: "MatchesWrapped", Params: []string{"wrapped", "expected"}},
isRegexp: true,
}
// ContainsWrapped is a Checker that looks for an expected string in
// another that might have been padded out and wrapped (so arbitrary
// amounts of whitespace is ok between non-whitespace bits).
var ContainsWrapped = &paddedChecker{
CheckerInfo: &check.CheckerInfo{Name: "EqualsWrapped", Params: []string{"wrapped", "expected"}},
isRegexp: false,
isPartial: true,
}
var spaceinator = regexp.MustCompile(`\s+`).ReplaceAllLiteralString
func (c *paddedChecker) Check(params []any, names []string) (result bool, errstr string) {
var other string
switch v := params[0].(type) {
case string:
other = v
case []byte:
other = string(v)
case error:
if v != nil {
other = v.Error()
}
default:
return false, "left-hand value must be a string or []byte or error"
}
expected, ok := params[1].(string)
if !ok {
ebuf, ok := params[1].([]byte)
if !ok {
return false, "right-hand value must be a string or []byte"
}
expected = string(ebuf)
}
ws := `\s`
if c.isLine {
ws = `[\t ]`
}
if c.isRegexp {
_, err := regexp.Compile(expected)
if err != nil {
return false, fmt.Sprintf("right-hand value must be a valid regexp: %v", err)
}
expected = spaceinator(expected, ws+"+")
} else {
fields := strings.Fields(expected)
for i := range fields {
fields[i] = regexp.QuoteMeta(fields[i])
}
expected = strings.Join(fields, ws+"+")
}
if !c.isPartial {
expected = "^" + ws + "*" + expected + ws + "*$"
}
if !c.isLine {
expected = "(?s)" + expected
}
matches, err := regexp.MatchString(expected, other)
if err != nil {
// can't happen (really)
panic(err)
}
return matches, ""
}
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