85 lines
2.2 KiB
C
85 lines
2.2 KiB
C
#include <ctype.h>
|
|
#include <assert.h>
|
|
#include "parser_internal.h"
|
|
|
|
static HParseResult* parse_whitespace(void* env, HParseState *state) {
|
|
char c;
|
|
HInputStream bak;
|
|
do {
|
|
bak = state->input_stream;
|
|
c = h_read_bits(&state->input_stream, 8, false);
|
|
if (state->input_stream.overrun)
|
|
break;
|
|
} while (isspace(c));
|
|
state->input_stream = bak;
|
|
return h_do_parse((HParser*)env, state);
|
|
}
|
|
|
|
static const char SPACE_CHRS[6] = {' ', '\f', '\n', '\r', '\t', '\v'};
|
|
|
|
static void desugar_whitespace(HAllocator *mm__, HCFStack *stk__, void *env) {
|
|
|
|
HCharset ws_cs = new_charset(mm__);
|
|
for(size_t i=0; i<sizeof(SPACE_CHRS); i++)
|
|
charset_set(ws_cs, SPACE_CHRS[i], 1);
|
|
|
|
HCFS_BEGIN_CHOICE() {
|
|
HCFS_BEGIN_SEQ() {
|
|
HCFS_BEGIN_CHOICE() {
|
|
HCFS_BEGIN_SEQ() {
|
|
HCFS_ADD_CHARSET(ws_cs);
|
|
HCFS_APPEND(HCFS_THIS_CHOICE); // yay circular pointer!
|
|
} HCFS_END_SEQ();
|
|
HCFS_BEGIN_SEQ() {
|
|
} HCFS_END_SEQ();
|
|
} HCFS_END_CHOICE();
|
|
HCFS_DESUGAR( (HParser*)env );
|
|
} HCFS_END_SEQ();
|
|
HCFS_THIS_CHOICE->reshape = h_act_last;
|
|
} HCFS_END_CHOICE();
|
|
}
|
|
|
|
static bool ws_isValidRegular(void *env) {
|
|
HParser *p = (HParser*)env;
|
|
return p->vtable->isValidRegular(p->env);
|
|
}
|
|
|
|
static bool ws_isValidCF(void *env) {
|
|
HParser *p = (HParser*)env;
|
|
return p->vtable->isValidCF(p->env);
|
|
}
|
|
|
|
static bool ws_ctrvm(HRVMProg *prog, void *env) {
|
|
HParser *p = (HParser*)env;
|
|
uint16_t start = h_rvm_get_ip(prog);
|
|
uint16_t next;
|
|
|
|
uint16_t ranges[2] = {
|
|
0x0d09,
|
|
0x2020,
|
|
};
|
|
|
|
for (int i = 0; i < 2; i++) {
|
|
next = h_rvm_insert_insn(prog, RVM_FORK, 0);
|
|
h_rvm_insert_insn(prog, RVM_MATCH, ranges[i]);
|
|
h_rvm_insert_insn(prog, RVM_STEP, 0);
|
|
h_rvm_insert_insn(prog, RVM_GOTO, start);
|
|
h_rvm_patch_arg(prog, next, h_rvm_get_ip(prog));
|
|
}
|
|
return h_compile_regex(prog, p);
|
|
}
|
|
|
|
static const HParserVtable whitespace_vt = {
|
|
.parse = parse_whitespace,
|
|
.isValidRegular = ws_isValidRegular,
|
|
.isValidCF = ws_isValidCF,
|
|
.desugar = desugar_whitespace,
|
|
.compile_to_rvm = ws_ctrvm,
|
|
};
|
|
|
|
HParser* h_whitespace(const HParser* p) {
|
|
return h_whitespace__m(&system_allocator, p);
|
|
}
|
|
HParser* h_whitespace__m(HAllocator* mm__, const HParser* p) {
|
|
return h_new_parser(mm__, &whitespace_vt, (void *)p);
|
|
}
|