30 lines
895 B
C++
30 lines
895 B
C++
// Implements a parser for an extended Backus-Naur form (BNF), producing the
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// binary context-free grammar format specified by whisper.h. Supports character
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// ranges, grouping, and repetition operators. As an example, a grammar for
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// arithmetic might look like:
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//
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// root ::= expr
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// expr ::= term ([-+*/] term)*
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// term ::= num | "(" space expr ")" space
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// num ::= [0-9]+ space
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// space ::= [ \t\n]*
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#pragma once
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#include "whisper.h"
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#include <vector>
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#include <map>
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#include <cstdint>
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#include <string>
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namespace grammar_parser {
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struct parse_state {
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std::map<std::string, uint32_t> symbol_ids;
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std::vector<std::vector<whisper_grammar_element>> rules;
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std::vector<const whisper_grammar_element *> c_rules() const;
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};
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parse_state parse(const char * src);
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void print_grammar(FILE * file, const parse_state & state);
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}
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