diff options
author | ridiculousfish <corydoras@ridiculousfish.com> | 2015-07-24 00:50:58 -0700 |
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committer | ridiculousfish <corydoras@ridiculousfish.com> | 2015-07-24 00:59:27 -0700 |
commit | b4f53143b0e05fd3061cdf2e65e17a6a2904090b (patch) | |
tree | 4785bf31f7b89fc2420aa740d9a6967dc6c6f9b1 /src/parse_productions.h | |
parent | 9c2fdc6da57032c4448b59de5872086eea626b74 (diff) |
Migrate source files into src/ directory
This change moves source files into a src/ directory,
and puts object files into an obj/ directory. The Makefile
and xcode project are updated accordingly.
Fixes #1866
Diffstat (limited to 'src/parse_productions.h')
-rw-r--r-- | src/parse_productions.h | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/src/parse_productions.h b/src/parse_productions.h new file mode 100644 index 00000000..df3ae9c9 --- /dev/null +++ b/src/parse_productions.h @@ -0,0 +1,71 @@ +/**\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 |