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Add jv string utility functions

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jv_string_empty()
        -> return an empty string with given allocated length (for fast
           appends)
    jv_string_append_codepoint
        -> append a single codepoint (int) to the given string
    jv_string_explode
        -> return an array of codepoints making up a string
    jv_string_implode
        -> return the UTF-8 encoding of an array of codepoint numbers
This commit is contained in:
Nicolas Williams
2013-11-28 14:48:46 -06:00
parent 1fc5656762
commit 08b4a34a8e
2 changed files with 57 additions and 0 deletions
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53
jv.c
View File

@@ -417,6 +417,14 @@ static jv_nontrivial jvp_string_new(const char* data, uint32_t length) {
return r;
}
static jv_nontrivial jvp_string_empty_new(uint32_t length) {
jvp_string* s = jvp_string_alloc(length);
s->length_hashed = 0;
memset(s->data, 0, length);
jv_nontrivial r = {&s->refcnt, {0,0}};
return r;
}
static void jvp_string_free(jv_nontrivial* s) {
if (jvp_refcnt_dec(s)) {
jvp_string* str = jvp_string_ptr(s);
@@ -560,6 +568,13 @@ jv jv_string_sized(const char* str, int len) {
return j;
}
jv jv_string_empty(int len) {
jv j;
j.kind = JV_KIND_STRING;
j.val.nontrivial = jvp_string_empty_new(len);
return j;
}
jv jv_string(const char* str) {
return jv_string_sized(str, strlen(str));
}
@@ -581,6 +596,37 @@ int jv_string_length_codepoints(jv j) {
return len;
}
jv jv_string_explode(jv j) {
assert(jv_get_kind(j) == JV_KIND_STRING);
const char* i = jv_string_value(j);
int len = jv_string_length_bytes(jv_copy(j));
const char* end = i + len;
jv a = jv_array_sized(len);
int c;
while ((i = jvp_utf8_next(i, end, &c)))
a = jv_array_append(a, jv_number(c));
jv_free(j);
return a;
}
jv jv_string_implode(jv j) {
assert(jv_get_kind(j) == JV_KIND_ARRAY);
int len = jv_array_length(jv_copy(j));
jv s = jv_string_empty(len);
int i;
assert(len >= 0);
for (i = 0; i < len; i++) {
jv n = jv_array_get(j, i);
assert(jv_get_kind(n) == JV_KIND_NUMBER);
s = jv_string_append_codepoint(s, jv_number_value(n));
}
jv_free(j);
return s;
}
unsigned long jv_string_hash(jv j) {
assert(jv_get_kind(j) == JV_KIND_STRING);
uint32_t hash = jvp_string_hash(jvp_string_ptr(&j.val.nontrivial));
@@ -612,6 +658,13 @@ jv jv_string_append_buf(jv a, const char* buf, int len) {
return a;
}
jv jv_string_append_codepoint(jv a, int c) {
char buf[5];
int len = jvp_utf8_encode(c, buf);
jvp_string_append(&a.val.nontrivial, buf, len);
return a;
}
jv jv_string_append_str(jv a, const char* str) {
return jv_string_append_buf(a, str, strlen(str));
}

4
jv.h
View File

@@ -75,14 +75,18 @@ jv jv_array_slice(jv, int, int);
jv jv_string(const char*);
jv jv_string_sized(const char*, int);
jv jv_string_empty(int len);
int jv_string_length_bytes(jv);
int jv_string_length_codepoints(jv);
unsigned long jv_string_hash(jv);
const char* jv_string_value(jv);
jv jv_string_concat(jv, jv);
jv jv_string_fmt(const char*, ...);
jv jv_string_append_codepoint(jv a, int c);
jv jv_string_append_buf(jv a, const char* buf, int len);
jv jv_string_append_str(jv a, const char* str);
jv jv_string_explode(jv j);
jv jv_string_implode(jv j);
jv jv_object();
jv jv_object_get(jv object, jv key);