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lex.h
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#ifndef LEX_H
#define LEX_H
#include "program.h"
#include "util.h"
#include <stdlib.h>
enum lex_token_ty {
LEX_TOKEN_TY_UNKNOWN,
LEX_TOKEN_TY_EOF,
/* Trivia (whitespace, comments). Handled entirely by lexer */
LEX_TOKEN_TY_WHITESPACE,
LEX_TOKEN_TY_INLINE_COMMENT,
LEX_TOKEN_TY_MULTILINE_COMMENT,
/* Bracket types */
LEX_TOKEN_TY_OPEN_BRACKET, // (
LEX_TOKEN_TY_CLOSE_BRACKET, // )
LEX_TOKEN_TY_OPEN_BRACE, // {
LEX_TOKEN_TY_CLOSE_BRACE, // }
LEX_TOKEN_TY_OPEN_SQUARE_BRACKET, // [
LEX_TOKEN_TY_CLOSE_SQUARE_BRACKET, // ]
LEX_TOKEN_TY_COLON, // :
LEX_TOKEN_TY_SEMICOLON, // ;
LEX_TOKEN_TY_COMMA, // ,
LEX_TOKEN_TY_DOT, // .
LEX_TOKEN_TY_ARROW, // ->
LEX_TOKEN_TY_QMARK, // ?
/* Operators */
LEX_TOKEN_TY_OP_LOGICAL_NOT, // !
LEX_TOKEN_TY_OP_NOT, // ~
LEX_TOKEN_TY_OP_INC, // ++
LEX_TOKEN_TY_OP_DEC, // --
LEX_TOKEN_TY_OP_LOGICAL_AND, // &&
LEX_TOKEN_TY_OP_LOGICAL_OR, // ||
LEX_TOKEN_TY_OP_AND, // &
LEX_TOKEN_TY_OP_AND_ASSG, // &=
LEX_TOKEN_TY_OP_OR, // |
LEX_TOKEN_TY_OP_OR_ASSG, // |=
LEX_TOKEN_TY_OP_XOR, // ^
LEX_TOKEN_TY_OP_XOR_ASSG, // ^=
LEX_TOKEN_TY_OP_RSHIFT, // >>
LEX_TOKEN_TY_OP_RSHIFT_ASSG, // >>=
LEX_TOKEN_TY_OP_LSHIFT, // <<
LEX_TOKEN_TY_OP_LSHIFT_ASSG, // <<=
LEX_TOKEN_TY_OP_ADD, // +
LEX_TOKEN_TY_OP_ADD_ASSG, // +=
LEX_TOKEN_TY_OP_SUB, // -
LEX_TOKEN_TY_OP_SUB_ASSG, // -=
LEX_TOKEN_TY_OP_MUL, // *
LEX_TOKEN_TY_OP_MUL_ASSG, // *=
LEX_TOKEN_TY_OP_DIV, // /
LEX_TOKEN_TY_OP_DIV_ASSG, // /=
LEX_TOKEN_TY_OP_QUOT, // %
LEX_TOKEN_TY_OP_QUOT_ASSG, // %=
LEX_TOKEN_TY_OP_ASSG, // =
LEX_TOKEN_TY_OP_EQ, // ==
LEX_TOKEN_TY_OP_NEQ, // !=
LEX_TOKEN_TY_OP_LT, // <
LEX_TOKEN_TY_OP_LTEQ, // <=
LEX_TOKEN_TY_OP_GT, // >
LEX_TOKEN_TY_OP_GTEQ, // >=
/* Variadic */
LEX_TOKEN_TY_ELLIPSIS,
/* Keywords */
LEX_TOKEN_TY_KW_GOTO,
LEX_TOKEN_TY_KW_BREAK,
LEX_TOKEN_TY_KW_CONTINUE,
LEX_TOKEN_TY_KW_FOR,
LEX_TOKEN_TY_KW_DO,
LEX_TOKEN_TY_KW_WHILE,
LEX_TOKEN_TY_KW_SWITCH,
LEX_TOKEN_TY_KW_IF,
LEX_TOKEN_TY_KW_ELSE,
LEX_TOKEN_TY_KW_DEFAULT,
LEX_TOKEN_TY_KW_CASE,
LEX_TOKEN_TY_KW_TYPEDEF,
LEX_TOKEN_TY_KW_STATIC,
LEX_TOKEN_TY_KW_EXTERN,
LEX_TOKEN_TY_KW_AUTO,
LEX_TOKEN_TY_KW_REGISTER,
LEX_TOKEN_TY_KW_INLINE,
LEX_TOKEN_TY_KW_CONST,
LEX_TOKEN_TY_KW_VOLATILE,
LEX_TOKEN_TY_KW_VOID,
LEX_TOKEN_TY_KW_HALF,
LEX_TOKEN_TY_KW_FLOAT,
LEX_TOKEN_TY_KW_DOUBLE,
LEX_TOKEN_TY_KW_CHAR,
LEX_TOKEN_TY_KW_SHORT,
LEX_TOKEN_TY_KW_INT,
LEX_TOKEN_TY_KW_LONG,
LEX_TOKEN_TY_KW_SIGNED,
LEX_TOKEN_TY_KW_UNSIGNED,
LEX_TOKEN_TY_KW_RETURN,
LEX_TOKEN_TY_KW_ENUM,
LEX_TOKEN_TY_KW_STRUCT,
LEX_TOKEN_TY_KW_UNION,
LEX_TOKEN_TY_KW_SIZEOF,
LEX_TOKEN_TY_KW_ALIGNOF, // both `_Alignof` (C11) and `alignof` (C23 onwards)
LEX_TOKEN_TY_KW_ALIGNAS, // both `_Alignas` (C11) and `alignas` (C23 onwards)
LEX_TOKEN_TY_IDENTIFIER,
/* Literals (all suffixes are case-insensitive) */
LEX_TOKEN_TY_ASCII_CHAR_LITERAL, // 'a'
LEX_TOKEN_TY_ASCII_WIDE_CHAR_LITERAL, // L'a'
LEX_TOKEN_TY_ASCII_STR_LITERAL, // "foobar"
LEX_TOKEN_TY_ASCII_WIDE_STR_LITERAL, // "foobar"
LEX_TOKEN_TY_FLOAT_LITERAL, // 10.0f
LEX_TOKEN_TY_DOUBLE_LITERAL, // 10.0
LEX_TOKEN_TY_LONG_DOUBLE_LITERAL, // 10.0l
// Note: `lex.c` relies on `unsigned` being `signed + 1`
LEX_TOKEN_TY_SIGNED_INT_LITERAL, // 10
LEX_TOKEN_TY_UNSIGNED_INT_LITERAL, // 10u
LEX_TOKEN_TY_SIGNED_LONG_LITERAL, // 10l
LEX_TOKEN_TY_UNSIGNED_LONG_LITERAL, // 10ul or 10lu
LEX_TOKEN_TY_SIGNED_LONG_LONG_LITERAL, // 10ll
LEX_TOKEN_TY_UNSIGNED_LONG_LONG_LITERAL, // 10ull or 10llu
};
enum lex_create_result { LEX_CREATE_RESULT_SUCCESS = 0 };
struct lex_token {
enum lex_token_ty ty;
struct text_span span;
};
struct lexer;
bool lexer_at_eof(struct lexer *lexer);
enum lex_create_result lexer_create(struct preprocessed_program *program,
struct lexer **lexer);
void lexer_free(struct lexer **lexer);
struct text_pos get_position(struct lexer *lexer);
void backtrack(struct lexer *lexer, struct text_pos position);
void peek_token(struct lexer *lexer, struct lex_token *token);
void consume_token(struct lexer *lexer, struct lex_token token);
// returns the associated text for a token, or NULL
// e.g
// * `token.ty == LEX_TOKEN_TY_OPEN_PAREN`, this returns NULL
// * `token.ty == LEX_TOKEN_TY_IDENTIFIER`, this returns the identifier
// TODO: maybe make this so it doesn't copy, and returns string length as well
const char *associated_text(const struct lexer *lexer,
const struct lex_token *token);
const char *strlike_associated_text(const struct lexer *lexer,
const struct lex_token *token, size_t *str_len);
const char *token_name(const struct lexer *lexer, const struct lex_token *token);
#endif