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#ifndef PARSER_H
#define PARSER_H
#include "value.h"
#include "lexer.h"
typedef struct parser *parser_t;
struct ast {
enum ast_type {
AST_SEXP,
AST_VALUE,
AST_TYPES // number of types
} type;
union {
struct sexp {
struct ast *children;
size_t nchildren;
struct sexp *prev;
} sexp;
value_t value;
};
};
struct parser {
struct sexp root;
struct sexp *cur_sexp;
struct quote_node {
struct sexp *cur_sexp;
struct quote_node *prev;
} *quote_head;
value_t begin_symbol_value;
value_t quote_symbol_value;
};
// allocate a parser
// returns a parser on success and NULL on fail
parser_t parser_create();
// deallocate a parser
void parser_destroy(parser_t parser);
// reset a parser to its default state without destroying it
// returns 0 on success
void parser_reset(parser_t parser);
// self explanatory
void parser_print_ast(parser_t parser);
// turn the given lexer (which has already has tokens) into an ast
// returns 0 on success, > 0 when more tokens are needed,
// and < 0 on a fatal error
int parser_parse_lexer(parser_t parser, lexer_t lexer);
#endif
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