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[gamecode] Document the format state machine

This commit is contained in:
Bill Currie 2020-04-01 20:50:42 +09:00
parent 0e7c7640f4
commit 41184bd97d
1 changed files with 32 additions and 0 deletions
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32
libs/gamecode/pr_strings.c
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@ -835,6 +835,37 @@ fmt_append_item (fmt_state_t *state)
#undef P_DOUBLE
#define P_DOUBLE(p,n) (*(double *) (state->args[n]))
/** State machine for PR_Sprintf
*
* Parsing of the format string is implemented via the following state
* machine. Note that in all states, end-of-string terminates the machine.
* If the machine terminates in any state other than format or conversion,
* an error is generated.
* \dot
* digraph PR_Sprintf_fmt_state_machine {
* format -> flags [label="{%}"];
* flags -> flags [label="{#+0 -}"];
* flags -> var_field_width [label="{*}"];
* flags -> precision [label="{.}"];
* flags -> field_width [label="{[1-9]}"];
* flags -> modifiers [label="other"];
* var_field_width -> precision [label="{.}"];
* var_field_width -> modifiers [label="other"];
* field_width -> field_width [label="{[0-9]}"];
* field_width -> precision [label="{.}"];
* field_width -> modifiers [label="other"];
* precision -> var_precision [label="{*}"];
* precision -> fixed_precision [label="{[0-9]}"];
* precision -> modifiers [label="other"];
* var_precision -> modifiers [label="instant"];
* fixed_precision -> fixed_precision [label="{[0-9]}"];
* fixed_precision -> modifiers [label="other"];
* modifiers -> conversion [label="instant/other"];
* conversion -> format [label="other"];
* }
* \enddot
*/
///@{
static void fmt_state_format (fmt_state_t *state);
static void fmt_state_flags (fmt_state_t *state);
static void fmt_state_var_field_width (fmt_state_t *state);
@ -1105,6 +1136,7 @@ fmt_state_format (fmt_state_t *state)
state->state = 0; // finished
}
}
///@}
VISIBLE void
PR_Sprintf (progs_t *pr, dstring_t *result, const char *name,