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108 | package main
import (
"fmt"
"io/ioutil"
"log"
"os"
"regexp"
"strings"
)
var (
valuePrefix = regexp.MustCompile(`^\.\.\. (value|error) string = `)
regexPrefix = regexp.MustCompile(`\.\.\. regex string = `)
)
func main() {
data, err := ioutil.ReadAll(os.Stdin)
if err != nil {
log.Fatal(err)
}
val, pat := parse(string(data))
mval, mpat := findMismatch(val, pat)
fmt.Printf("val mismatch from %q\n", mval)
fmt.Printf("pat mismatch from %q\n", mpat)
}
// findMismatch finds the last
func findMismatch(val, pat string) (mval, mpat string) {
for i := 1; i < len(pat); i++ {
re, err := regexp.Compile(pat[0:i])
if err != nil {
continue
}
// fmt.Printf("match %q\n", pat[0:i])
m := re.FindStringIndex(val)
if m != nil {
// fmt.Printf("-> %q %q\n", val[m[0]:m[1]], val[m[1]:])
mval = val[m[1]:]
mpat = pat[i:]
}
}
return
}
func trimLeadingRegex(s string, re *regexp.Regexp) string {
m := re.FindStringIndex(s)
if m == nil {
return s
}
return s[m[1]:]
}
func parse(s string) (val, pat string) {
lines := strings.Split(s, "\n")
for ; len(lines) > 0; lines = lines[1:] {
if valuePrefix.MatchString(lines[0]) {
break
}
}
if len(lines) == 0 {
log.Fatal("didn't see expected value from gocheck")
}
lines[0] = "... " + trimLeadingRegex(lines[0], valuePrefix)
var relines []string
for i, l := range lines {
if regexPrefix.MatchString(l) {
relines = lines[i:]
lines = lines[0:i]
break
}
}
if len(relines) == 0 {
log.Fatal("didn't see expected regex from gocheck")
}
relines[0] = "... " + trimLeadingRegex(relines[0], regexPrefix)
pat = "^" + buildString(relines) + "$"
val = buildString(lines)
// Note that the regexp is always anchored.
_, err := regexp.Compile(pat)
if err != nil {
log.Fatal("pattern is not valid regex: %v", err)
}
return
}
var dotdotdotPrefix = regexp.MustCompile(`^\.\.\. *"`)
func buildString(lines []string) string {
all := ""
for _, l := range lines {
if l0 := trimLeadingRegex(l, dotdotdotPrefix); l0 != l {
l = l0
} else {
continue
}
l = `"` + l
var s string
n, err := fmt.Sscanf(l, "%q", &s)
if n != 1 || err != nil {
log.Fatalf("failed to unquote string from line: %q", l)
}
all += s
}
return all
}
|