85 lines
1.9 KiB
C
85 lines
1.9 KiB
C
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#ifndef PARCEL_AST_H
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#define PARCEL_AST_H
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#include <utility.h>
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#include <tokenizer.h>
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typedef struct pac_ast pac_ast_s;
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typedef struct pac_ast_rule pac_ast_rule_s;
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typedef struct pac_ast_variant pac_ast_variant_s;
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typedef struct pac_ast_literal pac_ast_literal_s;
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typedef struct pac_ast_reference pac_ast_reference_s;
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typedef struct pac_ast_item pac_ast_item_s;
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struct pac_ast
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{
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usz_t num_rules;
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pac_ast_rule_s *rules;
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};
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struct pac_ast_rule
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{
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char *name;
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usz_t num_variants;
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pac_ast_variant_s *variants;
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};
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struct pac_ast_variant
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{
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usz_t num_items;
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pac_ast_item_s *items;
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};
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// pac_ast_reference: Also called non-terminal, a reference is an item
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// which represents all the contents of another rule.
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struct pac_ast_reference
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{
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usz_t len_name;
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char *name;
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};
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struct pac_ast_literal
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{
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usz_t length;
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char *string;
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};
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// pac_ast_set_e: An enumeration of all sets known in Parcel's AST.
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//
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// Sets are descriptions which describe a rough format of token, like
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// with variable names; the format is known, but the actual name isn't.
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typedef enum
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{
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PAC_AST_SET_RUNE,
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PAC_AST_SET_WORD,
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PAC_AST_SET_INTEGER,
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PAC_AST_SET_FLOAT
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} pac_ast_set_e;
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typedef enum
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{
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PAC_AST_ITEM_INVALID = 0x00,
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PAC_AST_ITEM_REFERENCE,
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PAC_AST_ITEM_LITERAL,
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PAC_AST_ITEM_SET
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} pac_ast_item_e;
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struct pac_ast_item
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{
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pac_ast_item_e type;
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union pac_ast_item_data
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{
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pac_ast_literal_s literal;
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pac_ast_set_e set;
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pac_ast_reference_s reference;
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} data;
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};
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pac_ast_s pac_grow_ast (pac_tlist_s tokens);
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#endif // PARCEL_AST_H
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