mirror of
https://github.com/fish-shell/fish-shell
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74 lines
2.2 KiB
C++
74 lines
2.2 KiB
C++
/**\file parse_tree.h
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Programmatic representation of fish code.
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*/
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#ifndef FISH_PARSE_TREE_CONSTRUCTION_H
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#define FISH_PARSE_TREE_CONSTRUCTION_H
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#include <stdint.h> // for uint8_t, uint32_t
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#include "common.h" // for wcstring
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#include "parse_constants.h" // for parse_token_type_t, etc
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struct parse_token_t;
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namespace parse_productions
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{
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#define MAX_PRODUCTIONS 5
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#define MAX_SYMBOLS_PER_PRODUCTION 6
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typedef uint32_t production_tag_t;
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/* 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. */
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typedef uint8_t production_element_t;
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/* An index into a production option list */
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typedef uint8_t production_option_idx_t;
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/* A production is an array of production elements */
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typedef production_element_t const production_t[MAX_SYMBOLS_PER_PRODUCTION];
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/* A production options is an array of (possible) productions */
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typedef production_t production_options_t[MAX_PRODUCTIONS];
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/* Resolve the type from a production element */
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inline parse_token_type_t production_element_type(production_element_t elem)
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{
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if (elem > LAST_TOKEN_OR_SYMBOL)
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{
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return parse_token_type_string;
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}
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else
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{
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return static_cast<parse_token_type_t>(elem);
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}
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}
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/* Resolve the keyword from a production element */
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inline parse_keyword_t production_element_keyword(production_element_t elem)
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{
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if (elem > LAST_TOKEN_OR_SYMBOL)
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{
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// First keyword is LAST_TOKEN_OR_SYMBOL + 1
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return static_cast<parse_keyword_t>(elem - LAST_TOKEN_OR_SYMBOL - 1);
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}
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else
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{
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return parse_keyword_none;
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}
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}
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/* Check if an element is valid */
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inline bool production_element_is_valid(production_element_t elem)
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{
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return elem != token_type_invalid;
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}
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/* 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. */
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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);
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}
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#endif
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