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/*
* Copyright © 2021 Michael Smith <mikesmiffy128@gmail.com>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
#include <stdbool.h>
#include "intdefs.h"
#include "kv.h"
#define EOF -1
void kv_parser_feed(struct kv_parser *this, const char *in, uint sz,
kv_parser_cb cb, void *ctxt) {
const char *p = in;
short c;
// slight hack, makes init more convenient (just {0})
if (!this->line) this->line = 1;
if (!this->outp) this->outp = this->tokbuf;
// this is a big ol' blob of ugly state machine macro spaghetti - too bad!
#define INCCOL() (*p == '\n' ? (++this->line, this->col = 0) : ++this->col)
#define READ() (p == in + sz ? EOF : (INCCOL(), *p++))
#define ERROR(s) do { \
this->state = KV_PARSER_ERROR; \
this->errmsg = s; \
return; \
} while (0)
#define OUT(c) do { \
if (this->outp - this->tokbuf == KV_TOKEN_MAX) { \
ERROR("token unreasonably large!"); \
} \
*this->outp++ = (c); \
} while (0)
#define CASE_WS case ' ': case '\t': case '\n': case '\r'
// note: multi-eval
#define IS_WS(c) ((c) == ' ' || (c) == '\t' || (c) == '\n' || (c) == '\r')
#define STATE(s) case s: s
#define HANDLE_EOF() do { case EOF: return; } while (0)
#define SKIP_COMMENT(next) do { \
this->state = next; \
this->incomment = true; \
goto start; \
} while (0)
#define GOTO(s) do { this->state = s; goto s; } while (0)
#define CB(type) do { \
cb(type, this->tokbuf, this->outp - this->tokbuf, ctxt); \
this->outp = this->tokbuf; \
} while (0)
// parser states, implemented by STATE() macros below
enum {
ok,
ok_slash,
ident,
ident_slash,
identq,
sep,
sep_slash,
val,
val_slash,
valq
};
start: // special spaghetti so we don't have a million different comment states
if (this->incomment) while ((c = READ()) != '\n') if (c == EOF) return;
this->incomment = false;
switch (this->state) {
STATE(ok):
switch (c = READ()) {
HANDLE_EOF();
CASE_WS: goto ok;
case '#': ERROR("kv macros not supported");
case '{': ERROR("unexpected control character");
case '}':
if (!this->nestlvl) ERROR("too many closing braces");
--this->nestlvl;
char c_ = c;
cb(KV_NEST_END, &c_, 1, ctxt);
goto ok;
case '"': GOTO(identq);
case '/': GOTO(ok_slash);
default: GOTO(ident);
}
STATE(ok_slash):
switch (c = READ()) {
HANDLE_EOF();
case '/': SKIP_COMMENT(ok);
default: OUT('/'); GOTO(ident);
}
ident:
OUT(c);
case ident: // continue here
switch (c = READ()) {
HANDLE_EOF();
case '{':
CB(KV_IDENT);
++this->nestlvl;
char c_ = c;
cb(KV_NEST_START, &c_, 1, ctxt);
GOTO(ok);
case '}': case '"': ERROR("unexpected control character");
CASE_WS:
CB(KV_IDENT);
GOTO(sep);
case '/': GOTO(ident_slash);
default: goto ident;
}
STATE(ident_slash):
switch (c = READ()) {
HANDLE_EOF();
case '/':
CB(KV_IDENT);
SKIP_COMMENT(sep);
default: OUT('/'); GOTO(ident);
}
STATE(identq):
switch (c = READ()) {
HANDLE_EOF();
case '"':
CB(KV_IDENT_QUOTED);
GOTO(sep);
default: OUT(c); goto identq;
}
STATE(sep):
do c = READ(); while (IS_WS(c));
switch (c) {
HANDLE_EOF();
case '[': ERROR("conditionals not supported");
case '{':;
char c_ = c;
++this->nestlvl;
cb(KV_NEST_START, &c_, 1, ctxt);
GOTO(ok);
case '"': GOTO(valq);
case '}': ERROR("unexpected control character");
case '/': GOTO(sep_slash);
default: GOTO(val);
}
STATE(sep_slash):
switch (c = READ()) {
HANDLE_EOF();
case '/': SKIP_COMMENT(sep);
default: OUT('/'); GOTO(val);
}
val:
OUT(c);
case val: // continue here
switch (c = READ()) {
HANDLE_EOF();
case '{': case '"': ERROR("unexpected control character");
// might get } with no whitespace
case '}':
CB(KV_VAL);
--this->nestlvl;
char c_ = c;
cb(KV_NEST_END, &c_, 1, ctxt);
GOTO(ok);
CASE_WS:
CB(KV_VAL);
GOTO(ok);
case '/': GOTO(val_slash);
default: goto val;
}
STATE(val_slash):
switch (c = READ()) {
HANDLE_EOF();
case '/':
CB(KV_VAL);
SKIP_COMMENT(ok);
default: OUT('/'); GOTO(val);
}
STATE(valq):
switch (c = READ()) {
HANDLE_EOF();
case '"':
CB(KV_VAL_QUOTED);
GOTO(ok);
default: OUT(c); goto valq;
}
}
#undef CB
#undef GOTO
#undef SKIP_COMMENT
#undef HANDLE_EOF
#undef STATE
#undef IS_WS
#undef CASE_WS
#undef OUT
#undef ERROR
#undef READ
#undef INCCOL
}
void kv_parser_done(struct kv_parser *this) {
if (this->state > 0) {
this->state = -1;
this->errmsg = "unexpected end of input";
}
else if (this->state == 0 && this->nestlvl != 0) {
this->state = -1;
this->errmsg = "unterminated object (unbalanced braces)";
}
}
// vi: sw=4 ts=4 noet tw=80 cc=80
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