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[njs] Array.prototype.find() method.

April 04, 2017 06:26AM
details: http://hg.nginx.org/njs/rev/52d53653ac52
branches:
changeset: 330:52d53653ac52
user: Andrey Zelenkov <zelenkov@nginx.com>
date: Tue Apr 04 06:10:10 2017 +0300
description:
Array.prototype.find() method.

Also introduced njs_array_iterator_sparse_apply() function.

diffstat:

njs/njs_array.c | 106 +++++++++++++++++++++++++++++++++++++++++++++++
njs/test/njs_unit_test.c | 43 +++++++++++++++++++
2 files changed, 149 insertions(+), 0 deletions(-)

diffs (197 lines):

diff -r c46da90ca064 -r 52d53653ac52 njs/njs_array.c
--- a/njs/njs_array.c Sun Apr 02 12:36:05 2017 +0300
+++ b/njs/njs_array.c Tue Apr 04 06:10:10 2017 +0300
@@ -58,6 +58,12 @@ typedef struct {

typedef struct {
njs_array_iter_t iter;
+ njs_value_t value;
+} njs_array_find_t;
+
+
+typedef struct {
+ njs_array_iter_t iter;
njs_array_t *array;
} njs_array_map_t;

@@ -92,6 +98,8 @@ static njs_ret_t njs_array_prototype_eve
njs_value_t *args, nxt_uint_t nargs, njs_index_t unused);
static njs_ret_t njs_array_prototype_filter_continuation(njs_vm_t *vm,
njs_value_t *args, nxt_uint_t nargs, njs_index_t unused);
+static njs_ret_t njs_array_prototype_find_continuation(njs_vm_t *vm,
+ njs_value_t *args, nxt_uint_t nargs, njs_index_t unused);
static njs_ret_t njs_array_prototype_map_continuation(njs_vm_t *vm,
njs_value_t *args, nxt_uint_t nargs, njs_index_t unused);
static nxt_noinline uint32_t njs_array_prototype_map_index(njs_array_t *array,
@@ -102,6 +110,8 @@ static nxt_noinline uint32_t njs_array_i
njs_array_iter_t *iter);
static nxt_noinline njs_ret_t njs_array_iterator_apply(njs_vm_t *vm,
njs_array_iter_t *iter, njs_value_t *args, nxt_uint_t nargs);
+static nxt_noinline njs_ret_t njs_array_prototype_find_apply(njs_vm_t *vm,
+ njs_array_iter_t *iter, njs_value_t *args, nxt_uint_t nargs);
static njs_ret_t njs_array_prototype_reduce_continuation(njs_vm_t *vm,
njs_value_t *args, nxt_uint_t nargs, njs_index_t unused);
static njs_ret_t njs_array_prototype_reduce_right_continuation(njs_vm_t *vm,
@@ -1465,6 +1475,94 @@ njs_array_prototype_filter_continuation(


static njs_ret_t
+njs_array_prototype_find(njs_vm_t *vm, njs_value_t *args, nxt_uint_t nargs,
+ njs_index_t unused)
+{
+ nxt_int_t ret;
+ njs_array_find_t *find;
+
+ ret = njs_array_iterator_args(vm, args, nargs);
+ if (nxt_slow_path(ret != NXT_OK)) {
+ return ret;
+ }
+
+ find = njs_vm_continuation(vm);
+ find->iter.u.cont.function = njs_array_prototype_find_continuation;
+ find->iter.retval.data.truth = 0;
+
+ return njs_array_prototype_find_continuation(vm, args, nargs, unused);
+}
+
+
+static njs_ret_t
+njs_array_prototype_find_continuation(njs_vm_t *vm, njs_value_t *args,
+ nxt_uint_t nargs, njs_index_t unused)
+{
+ njs_array_t *array;
+ njs_array_iter_t *iter;
+ njs_array_find_t *find;
+ const njs_value_t *retval;
+
+ retval = &njs_value_void;
+
+ find = njs_vm_continuation(vm);
+ iter = &find->iter;
+
+ if (!njs_is_true(&iter->retval)) {
+ array = args[0].data.u.array;
+ iter->index++;
+
+ if (iter->index < iter->length && iter->index < array->length) {
+ /* GC: find->value */
+ find->value = array->start[iter->index];
+
+ return njs_array_prototype_find_apply(vm, iter, args, nargs);
+ }
+
+ } else {
+ if (njs_is_valid(&find->value)) {
+ retval = &find->value;
+ }
+ }
+
+ vm->retval = *retval;
+
+ return NXT_OK;
+}
+
+
+static nxt_noinline njs_ret_t
+njs_array_prototype_find_apply(njs_vm_t *vm, njs_array_iter_t *iter,
+ njs_value_t *args, nxt_uint_t nargs)
+{
+ uint32_t n;
+ const njs_value_t *value;
+ njs_value_t arguments[4];
+
+ /* GC: array elt, array */
+
+ value = (nargs > 2) ? &args[2] : &njs_value_void;
+ arguments[0] = *value;
+
+ n = iter->index;
+ value = &args[0].data.u.array->start[n];
+
+ if (!njs_is_valid(value)) {
+ value = &njs_value_void;
+ }
+
+ arguments[1] = *value;
+
+ njs_number_set(&arguments[2], n);
+
+ arguments[3] = args[0];
+
+ return njs_function_apply(vm, args[1].data.u.function, arguments, 4,
+ (njs_index_t) &iter->retval);
+}
+
+
+static njs_ret_t
njs_array_prototype_map(njs_vm_t *vm, njs_value_t *args, nxt_uint_t nargs,
njs_index_t unused)
{
@@ -2041,6 +2139,14 @@ static const njs_object_prop_t njs_arra
njs_continuation_size(njs_array_filter_t), 0),
},

+ /* ES6. */
+ {
+ .type = NJS_METHOD,
+ .name = njs_string("find"),
+ .value = njs_native_function(njs_array_prototype_find,
+ njs_continuation_size(njs_array_find_t), 0),
+ },
+
{
.type = NJS_METHOD,
.name = njs_string("map"),
diff -r c46da90ca064 -r 52d53653ac52 njs/test/njs_unit_test.c
--- a/njs/test/njs_unit_test.c Sun Apr 02 12:36:05 2017 +0300
+++ b/njs/test/njs_unit_test.c Tue Apr 04 06:10:10 2017 +0300
@@ -2884,6 +2884,49 @@ static njs_unit_test_t njs_test[] =
nxt_string("1,11,21,31,41,51,61") },

{ nxt_string("var a = [];"
+ "a.find(function(v, i, a) { return v > 1 })"),
+ nxt_string("undefined") },
+
+ { nxt_string("var a = [,NaN,0,-1];"
+ "a.find(function(v, i, a) { return v > 1 })"),
+ nxt_string("undefined") },
+
+ { nxt_string("var a = [,NaN,0,-1,2];"
+ "a.find(function(v, i, a) { return v > 1 })"),
+ nxt_string("2") },
+
+ { nxt_string("var a = [1,2,3,-1,5];"
+ "a.find(function(v, i, a) { return v > 1 })"),
+ nxt_string("2") },
+
+ { nxt_string("var a = [,1,,-1,5];"
+ "a.find(function(v, i, a) { return v > 1 })"),
+ nxt_string("5") },
+
+ { nxt_string("var a = [,1,,-1,5,6];"
+ "a.find(function(v, i, a) { return v > 1 })"),
+ nxt_string("5") },
+
+ { nxt_string("[].find(function(v) { return (v === undefined) })"),
+ nxt_string("undefined") },
+
+ { nxt_string("var a = [,3];"
+ "a.find(function(v) { return (v === 3 || v === undefined) })"),
+ nxt_string("undefined") },
+
+ { nxt_string("var a = [1,,3];"
+ "a.find(function(v) { return (v === 3 || v === undefined) })"),
+ nxt_string("undefined") },
+
+ { nxt_string("var a = [1,2,3,4,5,6];"
+ "a.find(function(v, i, a) { a.shift(); return v == 3 })"),
+ nxt_string("3") },
+
+ { nxt_string("var a = [1,2,3,4,5,6];"
+ "a.find(function(v, i, a) { a.shift(); return v == 4 })"),
+ nxt_string("undefined") },
+
+ { nxt_string("var a = [];"
"a.map(function(v, i, a) { return v + 1 })"),
nxt_string("") },

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Subject Author Views Posted

[njs] Array.prototype.find() method.

Igor Sysoev 510 April 04, 2017 06:26AM



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