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[njs] String.prototype.trim() method.

October 28, 2016 06:40AM
details: http://hg.nginx.org/njs/rev/5de122a4031a
branches:
changeset: 226:5de122a4031a
user: Igor Sysoev <igor@sysoev.ru>
date: Fri Oct 28 13:32:33 2016 +0300
description:
String.prototype.trim() method.

In collaboration with Valentin Bartenev.

diffstat:

njs/njs_string.c | 136 +++++++++++++++++++++++++++++++++++++++++++++++
njs/test/njs_unit_test.c | 30 ++++++++++
2 files changed, 166 insertions(+), 0 deletions(-)

diffs (193 lines):

diff -r d84e34c2dbde -r 5de122a4031a njs/njs_string.c
--- a/njs/njs_string.c Thu Oct 27 16:38:05 2016 +0300
+++ b/njs/njs_string.c Fri Oct 28 13:32:33 2016 +0300
@@ -1614,6 +1614,135 @@ njs_string_prototype_to_upper_case(njs_v
}


+static njs_ret_t
+njs_string_prototype_trim(njs_vm_t *vm, njs_value_t *args, nxt_uint_t nargs,
+ njs_index_t unused)
+{
+ uint32_t u, trim, length;
+ const u_char *p, *prev, *start, *end;
+ njs_string_prop_t string;
+
+ trim = 0;
+
+ njs_string_prop(&string, &args[0]);
+
+ p = string.start;
+ end = string.start + string.size;
+
+ if (string.length == 0 || string.length == string.size) {
+ /* Byte or ASCII string. */
+
+ while (p < end) {
+
+ switch (*p) {
+ case 0x09: /* <TAB> */
+ case 0x0A: /* <LF> */
+ case 0x0B: /* <VT> */
+ case 0x0C: /* <FF> */
+ case 0x0D: /* <CR> */
+ case 0x20: /* <SP> */
+ case 0xA0: /* <NBSP> */
+ trim++;
+ p++;
+ continue;
+
+ default:
+ start = p;
+ p = end;
+
+ for ( ;; ) {
+ p--;
+
+ switch (*p) {
+ case 0x09: /* <TAB> */
+ case 0x0A: /* <LF> */
+ case 0x0B: /* <VT> */
+ case 0x0C: /* <FF> */
+ case 0x0D: /* <CR> */
+ case 0x20: /* <SP> */
+ case 0xA0: /* <NBSP> */
+ trim++;
+ continue;
+
+ default:
+ p++;
+ goto done;
+ }
+ }
+ }
+ }
+
+ } else {
+ /* UTF-8 string. */
+
+ while (p < end) {
+ prev = p;
+ u = nxt_utf8_decode(&p, end);
+
+ switch (u) {
+ case 0x0009: /* <TAB> */
+ case 0x000A: /* <LF> */
+ case 0x000B: /* <VT> */
+ case 0x000C: /* <FF> */
+ case 0x000D: /* <CR> */
+ case 0x0020: /* <SP> */
+ case 0x00A0: /* <NBSP> */
+ case 0x2028: /* <LS> */
+ case 0x2029: /* <PS> */
+ case 0xFEFF: /* <BOM> */
+ trim++;
+ continue;
+
+ default:
+ start = prev;
+ prev = end;
+
+ for ( ;; ) {
+ prev = nxt_utf8_prev(prev);
+ p = prev;
+ u = nxt_utf8_decode(&p, end);
+
+ switch (u) {
+ case 0x0009: /* <TAB> */
+ case 0x000A: /* <LF> */
+ case 0x000B: /* <VT> */
+ case 0x000C: /* <FF> */
+ case 0x000D: /* <CR> */
+ case 0x0020: /* <SP> */
+ case 0x00A0: /* <NBSP> */
+ case 0x2028: /* <LS> */
+ case 0x2029: /* <PS> */
+ case 0xFEFF: /* <BOM> */
+ trim++;
+ continue;
+
+ default:
+ goto done;
+ }
+ }
+ }
+ }
+ }
+
+ vm->retval = njs_string_empty;
+
+ return NXT_OK;
+
+done:
+
+ if (trim == 0) {
+ /* GC: retain. */
+ vm->retval = args[0];
+
+ return NXT_OK;
+ }
+
+ length = (string.length != 0) ? string.length - trim : 0;
+
+ return njs_string_new(vm, &vm->retval, start, p - start, length);
+}
+
+
/*
* String.search([regexp])
*/
@@ -2908,6 +3037,13 @@ static const njs_object_prop_t njs_stri

{
.type = NJS_METHOD,
+ .name = njs_string("trim"),
+ .value = njs_native_function(njs_string_prototype_trim, 0,
+ NJS_STRING_OBJECT_ARG),
+ },
+
+ {
+ .type = NJS_METHOD,
.name = njs_string("search"),
.value = njs_native_function(njs_string_prototype_search, 0,
NJS_STRING_OBJECT_ARG, NJS_REGEXP_ARG),
diff -r d84e34c2dbde -r 5de122a4031a njs/test/njs_unit_test.c
--- a/njs/test/njs_unit_test.c Thu Oct 27 16:38:05 2016 +0300
+++ b/njs/test/njs_unit_test.c Fri Oct 28 13:32:33 2016 +0300
@@ -3326,6 +3326,36 @@ static njs_unit_test_t njs_test[] =
"} a"),
nxt_string("304,453,456,459,498,1012,7838,8486,8490,8491") },

+ { nxt_string("'abc'.trim()"),
+ nxt_string("abc") },
+
+ { nxt_string("''.trim()"),
+ nxt_string("") },
+
+ { nxt_string("' '.trim()"),
+ nxt_string("") },
+
+ { nxt_string("'abc '.trim()"),
+ nxt_string("abc") },
+
+ { nxt_string("' abc'.trim()"),
+ nxt_string("abc") },
+
+ { nxt_string("' abc '.trim()"),
+ nxt_string("abc") },
+
+ { nxt_string("'абв '.trim()"),
+ nxt_string("абв") },
+
+ { nxt_string("' абв'.trim()"),
+ nxt_string("абв") },
+
+ { nxt_string("' абв '.trim()"),
+ nxt_string("абв") },
+
+ { nxt_string("'\\u2029abc\\uFEFF\\u2028'.trim()"),
+ nxt_string("abc") },
+
{ nxt_string("'abcdefgh'.search()"),
nxt_string("0") },

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Subject Author Views Posted

[njs] String.prototype.trim() method.

Igor Sysoev 629 October 28, 2016 06:40AM



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