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Merge pull request #124 from ALSchwalm/parse-state

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Add support for getting more detailed parser state
This commit is contained in:
Calvin Rose 2019-06-15 11:00:06 -04:00 committed by GitHub
commit 779fcf2d54
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GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 157 additions and 26 deletions
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4
src/boot/boot.janet
View File

@ -1788,7 +1788,7 @@
(default chunks (fn [buf p] (getline (string "repl:"
(parser/where p)
":"
(parser/state p) "> ")
(parser/state p :delimiters) "> ")
buf)))
(default onsignal (fn [f x]
(case (fiber/status f)
@ -1806,7 +1806,7 @@ _fiber is bound to the suspended fiber
```)
(repl (fn [buf p]
(def status (parser/state p))
(def status (parser/state p :delimiters))
(def c (parser/where p))
(def prompt (string "debug[" level "]:" c ":" status "> "))
(getline prompt buf))

177
src/core/parse.c
View File

@ -144,6 +144,8 @@ DEF_PARSER_STACK(_pushstate, JanetParseState, states, statecount, statecap)
#define PFLAG_LONGSTRING 0x4000
#define PFLAG_READERMAC 0x8000
#define PFLAG_ATSYM 0x10000
#define PFLAG_COMMENT 0x20000
#define PFLAG_TOKEN 0x40000
static void pushstate(JanetParser *p, Consumer consumer, int flags) {
JanetParseState s;
@ -357,7 +359,12 @@ static int tokenchar(JanetParser *p, JanetParseState *state, uint8_t c) {
static int comment(JanetParser *p, JanetParseState *state, uint8_t c) {
(void) state;
if (c == '\n') p->statecount--;
if (c == '\n') {
p->statecount--;
p->bufcount = 0;
} else {
push_buf(p, c);
}
return 1;
}
@ -465,7 +472,7 @@ static int atsign(JanetParser *p, JanetParseState *state, uint8_t c) {
default:
break;
}
pushstate(p, tokenchar, 0);
pushstate(p, tokenchar, PFLAG_TOKEN);
push_buf(p, '@'); /* Push the leading at-sign that was dropped */
return 0;
}
@ -479,7 +486,7 @@ static int root(JanetParser *p, JanetParseState *state, uint8_t c) {
p->error = "unexpected character";
return 1;
}
pushstate(p, tokenchar, 0);
pushstate(p, tokenchar, PFLAG_TOKEN);
return 0;
case '\'':
case ',':
@ -491,10 +498,10 @@ static int root(JanetParser *p, JanetParseState *state, uint8_t c) {
pushstate(p, stringchar, PFLAG_STRING);
return 1;
case '#':
pushstate(p, comment, 0);
pushstate(p, comment, PFLAG_COMMENT);
return 1;
case '@':
pushstate(p, atsign, 0);
pushstate(p, atsign, PFLAG_ATSYM);
return 1;
case '`':
pushstate(p, longstring, PFLAG_LONGSTRING);
@ -634,7 +641,7 @@ void janet_parser_deinit(JanetParser *parser) {
free(parser->states);
}
void janet_parser_clone(JanetParser *src, JanetParser *dest) {
void janet_parser_clone(const JanetParser *src, JanetParser *dest) {
/* Misc fields */
dest->flag = src->flag;
dest->pending = src->pending;
@ -857,35 +864,155 @@ static Janet cfun_parse_where(int32_t argc, Janet *argv) {
}
}
static Janet cfun_parse_state(int32_t argc, Janet *argv) {
static Janet janet_wrap_parse_state(JanetParseState *s, Janet *args,
uint8_t *buff, uint32_t bufcount) {
JanetTable *state = janet_table(0);
const uint8_t *buffer;
int add_buffer = 0;
const char *type = NULL;
if (s->flags & PFLAG_CONTAINER) {
JanetArray *container_args = janet_array(s->argn);
container_args->count = s->argn;
memcpy(container_args->data, args, sizeof(args[0])*s->argn);
janet_table_put(state, janet_ckeywordv("args"),
janet_wrap_array(container_args));
}
if (s->flags & PFLAG_PARENS || s->flags & PFLAG_SQRBRACKETS) {
if (s->flags & PFLAG_ATSYM) {
type = "array";
} else {
type = "tuple";
}
} else if (s->flags & PFLAG_CURLYBRACKETS) {
if (s->flags & PFLAG_ATSYM) {
type = "table";
} else {
type = "struct";
}
} else if (s->flags & PFLAG_STRING || s->flags & PFLAG_LONGSTRING) {
if (s->flags & PFLAG_BUFFER) {
type = "buffer";
} else {
type = "string";
}
add_buffer = 1;
} else if (s->flags & PFLAG_COMMENT) {
type = "comment";
add_buffer = 1;
} else if (s->flags & PFLAG_TOKEN) {
type = "token";
add_buffer = 1;
} else if (s->flags & PFLAG_ATSYM) {
type = "at";
} else if (s->flags & PFLAG_READERMAC) {
int c = s->flags & 0xFF;
type = (c == '\'') ? "quote" :
(c == ',') ? "unquote" :
(c == ';') ? "splice" :
(c == '~') ? "quasiquote" : "<reader>";
} else {
type = "root";
}
if (type) {
janet_table_put(state, janet_ckeywordv("type"),
janet_ckeywordv(type));
}
if (add_buffer) {
buffer = janet_string(buff, bufcount);
janet_table_put(state, janet_ckeywordv("buffer"), janet_wrap_string(buffer));
}
janet_table_put(state, janet_ckeywordv("start"),
janet_wrap_integer(s->start));
return janet_wrap_table(state);
}
struct ParserStateGetter {
const char *name;
Janet(*fn)(const JanetParser *p);
};
static Janet parser_state_delimiters(const JanetParser *_p) {
JanetParser *clone = janet_abstract(&janet_parse_parsertype, sizeof(JanetParser));
janet_parser_clone(_p, clone);
size_t i;
const uint8_t *str;
size_t oldcount;
janet_fixarity(argc, 1);
JanetParser *p = janet_getabstract(argv, 0, &janet_parse_parsertype);
oldcount = p->bufcount;
for (i = 0; i < p->statecount; i++) {
JanetParseState *s = p->states + i;
oldcount = clone->bufcount;
for (i = 0; i < clone->statecount; i++) {
JanetParseState *s = clone->states + i;
if (s->flags & PFLAG_PARENS) {
push_buf(p, '(');
push_buf(clone, '(');
} else if (s->flags & PFLAG_SQRBRACKETS) {
push_buf(p, '[');
push_buf(clone, '[');
} else if (s->flags & PFLAG_CURLYBRACKETS) {
push_buf(p, '{');
push_buf(clone, '{');
} else if (s->flags & PFLAG_STRING) {
push_buf(p, '"');
push_buf(clone, '"');
} else if (s->flags & PFLAG_LONGSTRING) {
int32_t i;
for (i = 0; i < s->argn; i++) {
push_buf(p, '`');
push_buf(clone, '`');
}
}
}
str = janet_string(p->buf + oldcount, (int32_t)(p->bufcount - oldcount));
p->bufcount = oldcount;
str = janet_string(clone->buf + oldcount, (int32_t)(clone->bufcount - oldcount));
clone->bufcount = oldcount;
return janet_wrap_string(str);
}
static Janet parser_state_frames(const JanetParser *p) {
size_t i;
JanetArray *states = janet_array(p->statecount);
states->count = p->statecount;
uint8_t *buf = p->buf;
Janet *args = p->args;
for (i = p->statecount; i > 0; --i) {
JanetParseState *s = p->states + (i - 1);
states->data[i - 1] = janet_wrap_parse_state(s, args, buf, p->bufcount);
args -= s->argn;
}
return janet_wrap_array(states);
}
static const struct ParserStateGetter parser_state_getters[] = {
{"frames", parser_state_frames},
{"delimiters", parser_state_delimiters},
{NULL, NULL}
};
static Janet cfun_parse_state(int32_t argc, Janet *argv) {
janet_arity(argc, 1, 2);
const uint8_t *key = NULL;
JanetParser *p = janet_getabstract(argv, 0, &janet_parse_parsertype);
if (argc == 2) {
key = janet_getkeyword(argv, 1);
}
if (key) {
/* Get one result */
for (const struct ParserStateGetter *sg = parser_state_getters;
sg->name != NULL; sg++) {
if (janet_cstrcmp(key, sg->name)) continue;
return sg->fn(p);
}
janet_panicf("unexpected keyword %v", janet_wrap_keyword(key));
return janet_wrap_nil();
} else {
/* Put results in table */
JanetTable *tab = janet_table(0);
for (const struct ParserStateGetter *sg = parser_state_getters;
sg->name != NULL; sg++) {
janet_table_put(tab, janet_ckeywordv(sg->name), sg->fn(p));
}
return janet_wrap_table(tab);
}
}
static Janet cfun_parse_clone(int32_t argc, Janet *argv) {
janet_fixarity(argc, 1);
JanetParser *src = janet_getabstract(argv, 0, &janet_parse_parsertype);
@ -980,11 +1107,15 @@ static const JanetReg parse_cfuns[] = {
},
{
"parser/state", cfun_parse_state,
JDOC("(parser/state parser)\n\n"
"Returns a string representation of the internal state of the parser. "
"Each byte in the string represents a nested data structure. For example, "
JDOC("(parser/state parser &opt key)\n\n"
"Returns a representation of the internal state of the parser. If a key is passed, "
"only that information about the state is returned. Allowed keys are:\n\n"
"\t:delimiters - Each byte in the string represents a nested data structure. For example, "
"if the parser state is '([\"', then the parser is in the middle of parsing a "
"string inside of square brackets inside parentheses. Can be used to augment a REPL prompt.")
"string inside of square brackets inside parentheses. Can be used to augment a REPL prompt."
"\t:frames - Each table in the array represents a 'frame' in the parser state. Frames "
"contain information about the start of the expression being parsed as well as the "
"type of that expression and some type-specific information.")
},
{
"parser/where", cfun_parse_where,

2
src/mainclient/init.janet
View File

@ -80,7 +80,7 @@
(defn noprompt [_] "")
(defn getprompt [p]
(def offset (parser/where p))
(string "janet:" offset ":" (parser/state p) "> "))
(string "janet:" offset ":" (parser/state p :delimiters) "> "))
(def prompter (if *quiet* noprompt getprompt))
(defn getstdin [prompt buf]
(file/write stdout prompt)