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Code Issues 1 Releases Wiki Activity

Update PEG documentation and peg syntax.

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Disable tail calls in the root scope for better
stacktraces, as the root scope may contain a single call
to a failing function, as in the case of the test suite.
This commit is contained in:
Calvin Rose
2019-01-14 20:41:32 -05:00
parent 99f176f37b
commit 90313afd40
4 changed files with 95 additions and 45 deletions
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50
src/core/peg.c
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@@ -39,7 +39,8 @@ typedef enum {
RULE_LOOK, /* [offset, rule] */
RULE_CHOICE, /* [len, rules...] */
RULE_SEQUENCE, /* [len, rules...] */
RULE_IFNOT, /* [rule_a, rule_b (a if not b)] */
RULE_IF, /* [rule_a, rule_b (b if a)] */
RULE_IFNOT, /* [rule_a, rule_b (b if not a)] */
RULE_NOT, /* [rule] */
RULE_BETWEEN, /* [lo, hi, rule] */
RULE_CAPTURE, /* [rule] */
@@ -207,6 +208,7 @@ tail:
rule = s->bytecode + args[len - 1];
goto tail;
}
case RULE_IF:
case RULE_IFNOT:
{
const uint32_t *rule_a = s->bytecode + rule[1];
@@ -214,11 +216,11 @@ tail:
int oldmode = s->mode;
s->mode = PEG_MODE_NOCAPTURE;
down1(s);
const uint8_t *result = peg_rule(s, rule_b, text);
const uint8_t *result = peg_rule(s, rule_a, text);
up1(s);
s->mode = oldmode;
if (result) return NULL;
rule = rule_a;
if (rule[0] == RULE_IF ? !result : !!result) return NULL;
rule = rule_b;
goto tail;
}
case RULE_NOT:
@@ -356,29 +358,23 @@ tail:
} else { /* RULE_REPLACE */
Janet constant = s->constants[rule[2]];
int32_t nbytes = (int32_t)(result - text);
switch (janet_type(constant)) {
default:
cap = constant;
break;
case JANET_STRUCT:
cap = janet_struct_get(janet_unwrap_struct(constant),
janet_stringv(text, nbytes));
s->captures->data[s->captures->count - 1]);
break;
case JANET_TABLE:
cap = janet_table_get(janet_unwrap_table(constant),
janet_stringv(text, nbytes));
s->captures->data[s->captures->count - 1]);
break;
case JANET_CFUNCTION:
janet_array_push(s->captures,
janet_stringv(text, nbytes));
JanetCFunction cfunc = janet_unwrap_cfunction(constant);
cap = cfunc(s->captures->count - cs.cap,
cap = janet_unwrap_cfunction(constant)(s->captures->count - cs.cap,
s->captures->data + cs.cap);
break;
case JANET_FUNCTION:
janet_array_push(s->captures,
janet_stringv(text, nbytes));
cap = janet_call(janet_unwrap_function(constant),
s->captures->count - cs.cap,
s->captures->data + cs.cap);
@@ -634,12 +630,20 @@ static void spec_sequence(Builder *b, int32_t argc, const Janet *argv) {
spec_variadic(b, argc, argv, RULE_SEQUENCE);
}
static void spec_ifnot(Builder *b, int32_t argc, const Janet *argv) {
/* For (if a b) and (if-not a b) */
static void spec_branch(Builder *b, int32_t argc, const Janet *argv, uint32_t rule) {
peg_fixarity(b, argc, 2);
Reserve r = reserve(b, 3);
uint32_t rule_a = compile1(b, argv[0]);
uint32_t rule_b = compile1(b, argv[1]);
emit_2(r, RULE_IFNOT, rule_a, rule_b);
emit_2(r, rule, rule_a, rule_b);
}
static void spec_if(Builder *b, int32_t argc, const Janet *argv) {
spec_branch(b, argc, argv, RULE_IF);
}
static void spec_ifnot(Builder *b, int32_t argc, const Janet *argv) {
spec_branch(b, argc, argv, RULE_IFNOT);
}
/* Rule of the form [rule] */
@@ -663,18 +667,6 @@ static void spec_group(Builder *b, int32_t argc, const Janet *argv) {
spec_onerule(b, argc, argv, RULE_GROUP);
}
static void spec_exponent(Builder *b, int32_t argc, const Janet *argv) {
peg_fixarity(b, argc, 2);
Reserve r = reserve(b, 4);
int32_t n = peg_getinteger(b, argv[1]);
uint32_t subrule = compile1(b, argv[0]);
if (n < 0) {
emit_3(r, RULE_BETWEEN, 0, -n, subrule);
} else {
emit_3(r, RULE_BETWEEN, n, UINT32_MAX, subrule);
}
}
static void spec_between(Builder *b, int32_t argc, const Janet *argv) {
peg_fixarity(b, argc, 3);
Reserve r = reserve(b, 4);
@@ -778,10 +770,9 @@ static const SpecialPair specials[] = {
{"!", spec_not},
{"*", spec_sequence},
{"+", spec_choice},
{"-", spec_ifnot},
{"/", spec_replace},
{"<-", spec_capture},
{">", spec_look},
{"^", spec_exponent},
{"any", spec_any},
{"argument", spec_argument},
{"at-least", spec_atleast},
@@ -793,6 +784,7 @@ static const SpecialPair specials[] = {
{"cmt", spec_matchtime},
{"constant", spec_constant},
{"group", spec_group},
{"if", spec_if},
{"if-not", spec_ifnot},
{"look", spec_look},
{"not", spec_not},