Source file
src/net/parse.go
1
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7
8 package net
9
10 import (
11 "internal/bytealg"
12 "io"
13 "os"
14 "time"
15 )
16
17 type file struct {
18 file *os.File
19 data []byte
20 atEOF bool
21 }
22
23 func (f *file) close() { f.file.Close() }
24
25 func (f *file) getLineFromData() (s string, ok bool) {
26 data := f.data
27 i := 0
28 for i = 0; i < len(data); i++ {
29 if data[i] == '\n' {
30 s = string(data[0:i])
31 ok = true
32
33 i++
34 n := len(data) - i
35 copy(data[0:], data[i:])
36 f.data = data[0:n]
37 return
38 }
39 }
40 if f.atEOF && len(f.data) > 0 {
41
42 s = string(data)
43 f.data = f.data[0:0]
44 ok = true
45 }
46 return
47 }
48
49 func (f *file) readLine() (s string, ok bool) {
50 if s, ok = f.getLineFromData(); ok {
51 return
52 }
53 if len(f.data) < cap(f.data) {
54 ln := len(f.data)
55 n, err := io.ReadFull(f.file, f.data[ln:cap(f.data)])
56 if n >= 0 {
57 f.data = f.data[0 : ln+n]
58 }
59 if err == io.EOF || err == io.ErrUnexpectedEOF {
60 f.atEOF = true
61 }
62 }
63 s, ok = f.getLineFromData()
64 return
65 }
66
67 func (f *file) stat() (mtime time.Time, size int64, err error) {
68 st, err := f.file.Stat()
69 if err != nil {
70 return time.Time{}, 0, err
71 }
72 return st.ModTime(), st.Size(), nil
73 }
74
75 func open(name string) (*file, error) {
76 fd, err := os.Open(name)
77 if err != nil {
78 return nil, err
79 }
80 return &file{fd, make([]byte, 0, 64*1024), false}, nil
81 }
82
83 func stat(name string) (mtime time.Time, size int64, err error) {
84 st, err := os.Stat(name)
85 if err != nil {
86 return time.Time{}, 0, err
87 }
88 return st.ModTime(), st.Size(), nil
89 }
90
91
92 func countAnyByte(s string, t string) int {
93 n := 0
94 for i := 0; i < len(s); i++ {
95 if bytealg.IndexByteString(t, s[i]) >= 0 {
96 n++
97 }
98 }
99 return n
100 }
101
102
103 func splitAtBytes(s string, t string) []string {
104 a := make([]string, 1+countAnyByte(s, t))
105 n := 0
106 last := 0
107 for i := 0; i < len(s); i++ {
108 if bytealg.IndexByteString(t, s[i]) >= 0 {
109 if last < i {
110 a[n] = s[last:i]
111 n++
112 }
113 last = i + 1
114 }
115 }
116 if last < len(s) {
117 a[n] = s[last:]
118 n++
119 }
120 return a[0:n]
121 }
122
123 func getFields(s string) []string { return splitAtBytes(s, " \r\t\n") }
124
125
126 const big = 0xFFFFFF
127
128
129
130 func dtoi(s string) (n int, i int, ok bool) {
131 n = 0
132 for i = 0; i < len(s) && '0' <= s[i] && s[i] <= '9'; i++ {
133 n = n*10 + int(s[i]-'0')
134 if n >= big {
135 return big, i, false
136 }
137 }
138 if i == 0 {
139 return 0, 0, false
140 }
141 return n, i, true
142 }
143
144
145
146 func xtoi(s string) (n int, i int, ok bool) {
147 n = 0
148 for i = 0; i < len(s); i++ {
149 if '0' <= s[i] && s[i] <= '9' {
150 n *= 16
151 n += int(s[i] - '0')
152 } else if 'a' <= s[i] && s[i] <= 'f' {
153 n *= 16
154 n += int(s[i]-'a') + 10
155 } else if 'A' <= s[i] && s[i] <= 'F' {
156 n *= 16
157 n += int(s[i]-'A') + 10
158 } else {
159 break
160 }
161 if n >= big {
162 return 0, i, false
163 }
164 }
165 if i == 0 {
166 return 0, i, false
167 }
168 return n, i, true
169 }
170
171
172
173
174
175 func xtoi2(s string, e byte) (byte, bool) {
176 if len(s) > 2 && s[2] != e {
177 return 0, false
178 }
179 n, ei, ok := xtoi(s[:2])
180 return byte(n), ok && ei == 2
181 }
182
183
184 func appendHex(dst []byte, i uint32) []byte {
185 if i == 0 {
186 return append(dst, '0')
187 }
188 for j := 7; j >= 0; j-- {
189 v := i >> uint(j*4)
190 if v > 0 {
191 dst = append(dst, hexDigit[v&0xf])
192 }
193 }
194 return dst
195 }
196
197
198 func count(s string, b byte) int {
199 n := 0
200 for i := 0; i < len(s); i++ {
201 if s[i] == b {
202 n++
203 }
204 }
205 return n
206 }
207
208
209 func last(s string, b byte) int {
210 i := len(s)
211 for i--; i >= 0; i-- {
212 if s[i] == b {
213 break
214 }
215 }
216 return i
217 }
218
219
220 func hasUpperCase(s string) bool {
221 for i := range s {
222 if 'A' <= s[i] && s[i] <= 'Z' {
223 return true
224 }
225 }
226 return false
227 }
228
229
230 func lowerASCIIBytes(x []byte) {
231 for i, b := range x {
232 if 'A' <= b && b <= 'Z' {
233 x[i] += 'a' - 'A'
234 }
235 }
236 }
237
238
239 func lowerASCII(b byte) byte {
240 if 'A' <= b && b <= 'Z' {
241 return b + ('a' - 'A')
242 }
243 return b
244 }
245
246
247 func trimSpace(x string) string {
248 for len(x) > 0 && isSpace(x[0]) {
249 x = x[1:]
250 }
251 for len(x) > 0 && isSpace(x[len(x)-1]) {
252 x = x[:len(x)-1]
253 }
254 return x
255 }
256
257
258 func isSpace(b byte) bool {
259 return b == ' ' || b == '\t' || b == '\n' || b == '\r'
260 }
261
262
263
264 func removeComment(line string) string {
265 if i := bytealg.IndexByteString(line, '#'); i != -1 {
266 return line[:i]
267 }
268 return line
269 }
270
271
272
273 func foreachField(x string, fn func(field string) error) error {
274 x = trimSpace(x)
275 for len(x) > 0 {
276 sp := bytealg.IndexByteString(x, ' ')
277 if sp == -1 {
278 return fn(x)
279 }
280 if field := trimSpace(x[:sp]); len(field) > 0 {
281 if err := fn(field); err != nil {
282 return err
283 }
284 }
285 x = trimSpace(x[sp+1:])
286 }
287 return nil
288 }
289
290
291
292 func stringsHasSuffix(s, suffix string) bool {
293 return len(s) >= len(suffix) && s[len(s)-len(suffix):] == suffix
294 }
295
296
297
298 func stringsHasSuffixFold(s, suffix string) bool {
299 return len(s) >= len(suffix) && stringsEqualFold(s[len(s)-len(suffix):], suffix)
300 }
301
302
303 func stringsHasPrefix(s, prefix string) bool {
304 return len(s) >= len(prefix) && s[:len(prefix)] == prefix
305 }
306
307
308
309 func stringsEqualFold(s, t string) bool {
310 if len(s) != len(t) {
311 return false
312 }
313 for i := 0; i < len(s); i++ {
314 if lowerASCII(s[i]) != lowerASCII(t[i]) {
315 return false
316 }
317 }
318 return true
319 }
320
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