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authorAleksey Veresov <aleksey@veresov.pro>2020-08-28 11:45:49 +0300
committerAleksey Veresov <aleksey@veresov.pro>2020-08-28 11:45:49 +0300
commit9ea866aa40ec18fcad53918d064a481d06173216 (patch)
treec70629d8a1942d30086c3536f6cf3bcd125e1d88
parent749cdb81da654efad8e8b54c772f4c92b7330ed7 (diff)
downloadtela-9ea866aa40ec18fcad53918d064a481d06173216.tar
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More descriptions added.
-rw-r--r--tl.c47
1 files changed, 24 insertions, 23 deletions
diff --git a/tl.c b/tl.c
index c4bfc27..aaf01c5 100644
--- a/tl.c
+++ b/tl.c
@@ -45,7 +45,7 @@ struct tl_list *tl_named_data(const char *name,
* internal list functions
*/
static struct tl_list *tl_list_union(struct tl_list *a, struct tl_list *b)
-{
+{ /* Copy a appending copy of b. */
if (!a) return b ? tl_list_union(b, 0) : 0;
return tl_new(a->name, a->data,
tl_list_union(a->list, 0),
@@ -69,6 +69,8 @@ static void tl_list_free(struct tl_list *l)
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* string
+ * Strings are represented as usual char * null-terminated string.
+ * Size and length are stored before the string (so it is fat pointer).
*/
static int *tl_string_size(char *str) { return ((int *) str) - 2; }
static int *tl_string_len(char *str) { return ((int *) str) - 1; }
@@ -101,6 +103,8 @@ static void tl_string_free(char *str)
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* template language translator as automata
+ * Automata states are functions, consuming a character, changing automata,
+ * returning new state and outputting substituted text.
*/
struct tl {
struct tl_list *variables;
@@ -137,7 +141,7 @@ static void *tl_state_backslash(struct tl *t, char c);
static void *tl_state_at(struct tl *t, char c);
static void *tl_state_subs(struct tl *t, char c);
static void *tl_state_text(struct tl *t, char c)
-{
+{ /* Normal state is to just copy input, switching state on specials. */
if (c == '\\') return tl_state_backslash;
if (c == '@') return tl_state_at;
if (c == '{') return tl_state_subs;
@@ -146,11 +150,11 @@ static void *tl_state_text(struct tl *t, char c)
}
static void *tl_state_subs(struct tl *t, char c)
-{
+{ /* Read name until } and output value from variables of this name. */
if (c == '}') {
struct tl_list *var = tl_list_get(t->variables, t->name);
if (var && var->data) {
- printf("%s", var->data);
+ fputs(var->data, stdout);
}
tl_string_free(t->name);
t->name = 0;
@@ -160,8 +164,16 @@ static void *tl_state_subs(struct tl *t, char c)
return tl_state_subs;
}
+static void *tl_state_body(struct tl *t, char c);
+static void *tl_state_at(struct tl *t, char c)
+{ /* Read name until { and start reading body after it. */
+ if (c == '{') return tl_state_body;
+ tl_string_add(&t->name, c);
+ return tl_state_at;
+}
+
static void tl_at(struct tl *t)
-{
+{ /* Repeat the body substitution in context of readed name. */
struct tl_list *var = tl_list_get(t->variables, t->name);
for (var = var->list; var; var = var->next) {
char *c;
@@ -174,23 +186,16 @@ static void tl_at(struct tl *t)
tl_free(&automata);
}
}
-static void *tl_state_body(struct tl *t, char c);
-static void *tl_state_at(struct tl *t, char c)
-{
- if (c == '{') return tl_state_body;
- tl_string_add(&t->name, c);
- return tl_state_at;
-}
static void *tl_state_body(struct tl *t, char c)
-{
+{ /* Read the body until } respecting nesting and call tl_at. */
if (c == '{') ++t->opened;
- if (c == '}' && !t->opened--) {
+ else if (c == '}' && !t->opened--) {
tl_at(t);
t->opened = 0;
- free(t->name - 8);
+ tl_string_free(t->name);
t->name = 0;
- free(t->body - 8);
+ tl_string_free(t->body);
t->body = 0;
return tl_state_text;
}
@@ -199,12 +204,8 @@ static void *tl_state_body(struct tl *t, char c)
}
static void *tl_state_backslash(struct tl *t, char c)
-{
- if (c == '\n') return tl_state_text;
- if (c == 'n') {
- putchar('\n');
- return tl_state_text;
- }
- putchar(c);
+{ /* Output newline for \n, nothing for \ and newline, and copy the rest. */
+ if (c == 'n') putchar('\n');
+ else if (c != '\n') putchar(c);
return tl_state_text;
}