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Copy pathparse_productions.h
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71 lines (54 loc) · 2.08 KB
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/**\file parse_tree.h
Programmatic representation of fish code.
*/
#ifndef FISH_PARSE_TREE_CONSTRUCTION_H
#define FISH_PARSE_TREE_CONSTRUCTION_H
#include "parse_tree.h"
#include <inttypes.h>
namespace parse_productions
{
#define MAX_PRODUCTIONS 5
#define MAX_SYMBOLS_PER_PRODUCTION 6
typedef uint32_t production_tag_t;
/* A production is an array of unsigned char. Symbols are encoded directly as their symbol value. Keywords are encoded with an offset of LAST_TOKEN_OR_SYMBOL + 1. So essentially we glom together keywords and symbols. */
typedef uint8_t production_element_t;
/* An index into a production option list */
typedef uint8_t production_option_idx_t;
/* A production is an array of production elements */
typedef production_element_t const production_t[MAX_SYMBOLS_PER_PRODUCTION];
/* A production options is an array of (possible) productions */
typedef production_t production_options_t[MAX_PRODUCTIONS];
/* Resolve the type from a production element */
inline parse_token_type_t production_element_type(production_element_t elem)
{
if (elem > LAST_TOKEN_OR_SYMBOL)
{
return parse_token_type_string;
}
else
{
return static_cast<parse_token_type_t>(elem);
}
}
/* Resolve the keyword from a production element */
inline parse_keyword_t production_element_keyword(production_element_t elem)
{
if (elem > LAST_TOKEN_OR_SYMBOL)
{
// First keyword is LAST_TOKEN_OR_SYMBOL + 1
return static_cast<parse_keyword_t>(elem - LAST_TOKEN_OR_SYMBOL - 1);
}
else
{
return parse_keyword_none;
}
}
/* Check if an element is valid */
inline bool production_element_is_valid(production_element_t elem)
{
return elem != token_type_invalid;
}
/* Fetch a production. We are passed two input tokens. The first input token is guaranteed to not be invalid; the second token may be invalid if there's no more tokens. */
const production_t *production_for_token(parse_token_type_t node_type, const parse_token_t &input1, const parse_token_t &input2, production_option_idx_t *out_which_production, wcstring *out_error_text);
}
#endif