31 lines
943 B
C
31 lines
943 B
C
#include "parser_internal.h"
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static HParseResult *parse_and(void* env, HParseState* state) {
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HInputStream bak = state->input_stream;
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HParseResult *res = h_do_parse((HParser*)env, state);
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state->input_stream = bak;
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if (res)
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return make_result(state->arena, NULL);
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return NULL;
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}
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static const HParserVtable and_vt = {
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.parse = parse_and,
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.isValidRegular = h_false, /* TODO: strictly speaking this should be regular,
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but it will be a huge amount of work and difficult
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to get right, so we're leaving it for a future
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revision. --mlp, 18/12/12 */
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.isValidCF = h_false, /* despite TODO above, this remains false. */
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.compile_to_rvm = h_not_regular,
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.higher = true,
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};
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HParser* h_and(const HParser* p) {
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return h_and__m(&system_allocator, p);
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}
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HParser* h_and__m(HAllocator* mm__, const HParser* p) {
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// zero-width postive lookahead
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void* env = (void*)p;
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return h_new_parser(mm__, &and_vt, env);
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}
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