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-rw-r--r--third-party/mustach/mustach.c327
1 files changed, 327 insertions, 0 deletions
diff --git a/third-party/mustach/mustach.c b/third-party/mustach/mustach.c
new file mode 100644
index 0000000..830e72c
--- /dev/null
+++ b/third-party/mustach/mustach.c
@@ -0,0 +1,327 @@
+/*
+ Author: José Bollo <jobol@nonadev.net>
+ Author: José Bollo <jose.bollo@iot.bzh>
+
+ https://gitlab.com/jobol/mustach
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+*/
+
+#define _GNU_SOURCE
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <ctype.h>
+
+#include "mustach.h"
+
+#define NAME_LENGTH_MAX 1024
+#define DEPTH_MAX 256
+
+#if !defined(NO_OPEN_MEMSTREAM)
+static FILE *memfile_open(char **buffer, size_t *size)
+{
+ return open_memstream(buffer, size);
+}
+static void memfile_abort(FILE *file, char **buffer, size_t *size)
+{
+ fclose(file);
+ free(*buffer);
+ *buffer = NULL;
+ *size = 0;
+}
+static int memfile_close(FILE *file, char **buffer, size_t *size)
+{
+ int rc;
+
+ /* adds terminating null */
+ rc = fputc(0, file) ? MUSTACH_ERROR_SYSTEM : 0;
+ fclose(file);
+ if (rc == 0)
+ /* removes terminating null of the length */
+ (*size)--;
+ else {
+ free(*buffer);
+ *buffer = NULL;
+ *size = 0;
+ }
+ return rc;
+}
+#else
+static FILE *memfile_open(char **buffer, size_t *size)
+{
+ return tmpfile();
+}
+static void memfile_abort(FILE *file, char **buffer, size_t *size)
+{
+ fclose(file);
+ *buffer = NULL;
+ *size = 0;
+}
+static int memfile_close(FILE *file, char **buffer, size_t *size)
+{
+ int rc;
+ size_t s;
+ char *b;
+
+ s = (size_t)ftell(file);
+ b = malloc(s + 1);
+ if (b == NULL) {
+ rc = MUSTACH_ERROR_SYSTEM;
+ errno = ENOMEM;
+ s = 0;
+ } else {
+ rewind(file);
+ if (1 == fread(b, s, 1, file)) {
+ rc = 0;
+ b[s] = 0;
+ } else {
+ rc = MUSTACH_ERROR_SYSTEM;
+ free(b);
+ b = NULL;
+ s = 0;
+ }
+ }
+ *buffer = b;
+ *size = s;
+ return rc;
+}
+#endif
+
+static int getpartial(struct mustach_itf *itf, void *closure, const char *name, char **result)
+{
+ int rc;
+ FILE *file;
+ size_t size;
+
+ *result = NULL;
+ file = memfile_open(result, &size);
+ if (file == NULL)
+ rc = MUSTACH_ERROR_SYSTEM;
+ else {
+ rc = itf->put(closure, name, 0, file);
+ if (rc < 0)
+ memfile_abort(file, result, &size);
+ else
+ rc = memfile_close(file, result, &size);
+ }
+ return rc;
+}
+
+static int process(const char *template, struct mustach_itf *itf, void *closure, FILE *file, const char *opstr, const char *clstr)
+{
+ char name[NAME_LENGTH_MAX + 1], *partial, c, *tmp;
+ const char *beg, *term;
+ struct { const char *name, *again; size_t length; int emit, entered; } stack[DEPTH_MAX];
+ size_t oplen, cllen, len, l;
+ int depth, rc, emit;
+
+ emit = 1;
+ oplen = strlen(opstr);
+ cllen = strlen(clstr);
+ depth = 0;
+ for(;;) {
+ beg = strstr(template, opstr);
+ if (beg == NULL) {
+ /* no more mustach */
+ if (emit)
+ fwrite(template, strlen(template), 1, file);
+ return depth ? MUSTACH_ERROR_UNEXPECTED_END : 0;
+ }
+ if (emit)
+ fwrite(template, (size_t)(beg - template), 1, file);
+ beg += oplen;
+ term = strstr(beg, clstr);
+ if (term == NULL)
+ return MUSTACH_ERROR_UNEXPECTED_END;
+ template = term + cllen;
+ len = (size_t)(term - beg);
+ c = *beg;
+ switch(c) {
+ case '!':
+ case '=':
+ break;
+ case '{':
+ for (l = 0 ; clstr[l] == '}' ; l++);
+ if (clstr[l]) {
+ if (!len || beg[len-1] != '}')
+ return MUSTACH_ERROR_BAD_UNESCAPE_TAG;
+ len--;
+ } else {
+ if (term[l] != '}')
+ return MUSTACH_ERROR_BAD_UNESCAPE_TAG;
+ template++;
+ }
+ c = '&';
+ /*@fallthrough@*/
+ case '^':
+ case '#':
+ case '/':
+ case '&':
+ case '>':
+#if !defined(NO_EXTENSION_FOR_MUSTACH) && !defined(NO_COLON_EXTENSION_FOR_MUSTACH)
+ case ':':
+#endif
+ beg++; len--;
+ default:
+ while (len && isspace(beg[0])) { beg++; len--; }
+ while (len && isspace(beg[len-1])) len--;
+#if defined(NO_EXTENSION_FOR_MUSTACH) || defined(NO_ALLOW_EMPTY_TAG)
+ if (len == 0)
+ return MUSTACH_ERROR_EMPTY_TAG;
+#endif
+ if (len > NAME_LENGTH_MAX)
+ return MUSTACH_ERROR_TAG_TOO_LONG;
+ memcpy(name, beg, len);
+ name[len] = 0;
+ break;
+ }
+ switch(c) {
+ case '!':
+ /* comment */
+ /* nothing to do */
+ break;
+ case '=':
+ /* defines separators */
+ if (len < 5 || beg[len - 1] != '=')
+ return MUSTACH_ERROR_BAD_SEPARATORS;
+ beg++;
+ len -= 2;
+ for (l = 0; l < len && !isspace(beg[l]) ; l++);
+ if (l == len)
+ return MUSTACH_ERROR_BAD_SEPARATORS;
+ oplen = l;
+ tmp = alloca(oplen + 1);
+ memcpy(tmp, beg, oplen);
+ tmp[oplen] = 0;
+ opstr = tmp;
+ while (l < len && isspace(beg[l])) l++;
+ if (l == len)
+ return MUSTACH_ERROR_BAD_SEPARATORS;
+ cllen = len - l;
+ tmp = alloca(cllen + 1);
+ memcpy(tmp, beg + l, cllen);
+ tmp[cllen] = 0;
+ clstr = tmp;
+ break;
+ case '^':
+ case '#':
+ /* begin section */
+ if (depth == DEPTH_MAX)
+ return MUSTACH_ERROR_TOO_DEEP;
+ rc = emit;
+ if (rc) {
+ rc = itf->enter(closure, name);
+ if (rc < 0)
+ return rc;
+ }
+
+ if (template[0] == '\n')
+ ++template;
+
+ stack[depth].name = beg;
+ stack[depth].again = template;
+ stack[depth].length = len;
+ stack[depth].emit = emit;
+ stack[depth].entered = rc;
+ if ((c == '#') == (rc == 0))
+ emit = 0;
+ depth++;
+ break;
+ case '/':
+ /* end section */
+ if (depth-- == 0 || len != stack[depth].length || memcmp(stack[depth].name, name, len))
+ return MUSTACH_ERROR_CLOSING;
+ rc = emit && stack[depth].entered ? itf->next(closure) : 0;
+ if (rc < 0)
+ return rc;
+ if (rc) {
+ template = stack[depth++].again;
+ } else {
+ emit = stack[depth].emit;
+ if (emit && stack[depth].entered)
+ itf->leave(closure);
+ }
+ break;
+ case '>':
+ /* partials */
+ if (emit) {
+ rc = getpartial(itf, closure, name, &partial);
+ if (rc == 0) {
+ rc = process(partial, itf, closure, file, opstr, clstr);
+ free(partial);
+ }
+ if (rc < 0)
+ return rc;
+ }
+ break;
+ default:
+ /* replacement */
+ if (emit) {
+ rc = itf->put(closure, name, c != '&', file);
+ if (rc < 0)
+ return rc;
+ }
+ break;
+ }
+ }
+}
+
+int fmustach(const char *template, struct mustach_itf *itf, void *closure, FILE *file)
+{
+ int rc = itf->start ? itf->start(closure) : 0;
+ if (rc == 0)
+ rc = process(template, itf, closure, file, "{{", "}}");
+ return rc;
+}
+
+int fdmustach(const char *template, struct mustach_itf *itf, void *closure, int fd)
+{
+ int rc;
+ FILE *file;
+
+ file = fdopen(fd, "w");
+ if (file == NULL) {
+ rc = MUSTACH_ERROR_SYSTEM;
+ errno = ENOMEM;
+ } else {
+ rc = fmustach(template, itf, closure, file);
+ fclose(file);
+ }
+ return rc;
+}
+
+int mustach(const char *template, struct mustach_itf *itf, void *closure, char **result, size_t *size)
+{
+ int rc;
+ FILE *file;
+ size_t s;
+
+ *result = NULL;
+ if (size == NULL)
+ size = &s;
+ file = memfile_open(result, size);
+ if (file == NULL)
+ rc = MUSTACH_ERROR_SYSTEM;
+ else {
+ rc = fmustach(template, itf, closure, file);
+ if (rc < 0)
+ memfile_abort(file, result, size);
+ else
+ rc = memfile_close(file, result, size);
+ }
+ return rc;
+}
+
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