mirror of
https://github.com/fish-shell/fish-shell.git
synced 2024-11-25 18:03:37 +08:00
72 lines
2.1 KiB
C++
72 lines
2.1 KiB
C++
/**\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
|