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|
package main
import (
"bytes"
"path/filepath"
"strings"
)
func splitSpaces(s string) []string {
var r []string
tokStart := -1
for i, ch := range s {
if ch == ' ' || ch == '\t' {
if tokStart >= 0 {
r = append(r, s[tokStart:i])
tokStart = -1
}
} else {
if tokStart < 0 {
tokStart = i
}
}
}
if tokStart >= 0 {
r = append(r, s[tokStart:])
}
Log("splitSpace(%q)=%q", s, r)
return r
}
func splitSpacesBytes(s []byte) (r [][]byte) {
tokStart := -1
for i, ch := range s {
if ch == ' ' || ch == '\t' {
if tokStart >= 0 {
r = append(r, s[tokStart:i])
tokStart = -1
}
} else {
if tokStart < 0 {
tokStart = i
}
}
}
if tokStart >= 0 {
r = append(r, s[tokStart:])
}
Log("splitSpace(%q)=%q", s, r)
return r
}
func matchPattern(pat, str string) bool {
i := strings.IndexByte(pat, '%')
if i < 0 {
return pat == str
}
return strings.HasPrefix(str, pat[:i]) && strings.HasSuffix(str, pat[i+1:])
}
func matchPatternBytes(pat, str []byte) bool {
i := bytes.IndexByte(pat, '%')
if i < 0 {
return bytes.Equal(pat, str)
}
return bytes.HasPrefix(str, pat[:i]) && bytes.HasSuffix(str, pat[i+1:])
}
func substPattern(pat, repl, str string) string {
ps := strings.SplitN(pat, "%", 2)
if len(ps) != 2 {
if str == pat {
return repl
}
return str
}
in := str
trimed := str
if ps[0] != "" {
trimed = strings.TrimPrefix(in, ps[0])
if trimed == in {
return str
}
}
in = trimed
if ps[1] != "" {
trimed = strings.TrimSuffix(in, ps[1])
if trimed == in {
return str
}
}
rs := strings.SplitN(repl, "%", 2)
if len(rs) != 2 {
return repl
}
return rs[0] + trimed + rs[1]
}
func substPatternBytes(pat, repl, str []byte) []byte {
ps := bytes.SplitN(pat, []byte{'%'}, 2)
if len(ps) != 2 {
if bytes.Equal(str, pat) {
return repl
}
return str
}
in := str
trimed := str
if len(ps[0]) != 0 {
trimed = bytes.TrimPrefix(in, ps[0])
if bytes.Equal(trimed, in) {
return str
}
}
in = trimed
if len(ps[1]) != 0 {
trimed = bytes.TrimSuffix(in, ps[1])
if bytes.Equal(trimed, in) {
return str
}
}
rs := bytes.SplitN(repl, []byte{'%'}, 2)
if len(rs) != 2 {
return repl
}
r := make([]byte, 0, len(rs[0])+len(trimed)+len(rs[1])+1)
r = append(r, rs[0]...)
r = append(r, trimed...)
r = append(r, rs[1]...)
return r
}
func substRef(pat, repl, str string) string {
if strings.IndexByte(pat, '%') >= 0 && strings.IndexByte(repl, '%') >= 0 {
return substPattern(pat, repl, str)
}
str = strings.TrimSuffix(str, pat)
return str + repl
}
func stripExt(s string) string {
suf := filepath.Ext(s)
return s[:len(s)-len(suf)]
}
func trimLeftSpace(s string) string {
for i, ch := range s {
if ch != ' ' && ch != '\t' {
return s[i:]
}
}
return ""
}
func trimLeftSpaceBytes(s []byte) []byte {
for i, ch := range s {
if ch != ' ' && ch != '\t' {
return s[i:]
}
}
return nil
}
// Strip leading sequences of './' from file names, so that ./file
// and file are considered to be the same file.
// From http://www.gnu.org/software/make/manual/make.html#Features
func trimLeadingCurdir(s string) string {
for strings.HasPrefix(s, "./") {
s = s[2:]
}
return s
}
|
