forked from enlightenment/efl
213 lines
6.8 KiB
C
213 lines
6.8 KiB
C
#ifndef __EO_LEXER_H__
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#define __EO_LEXER_H__
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#include <setjmp.h>
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#include <Eina.h>
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#include <Eolian.h>
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#include "eolian_database.h"
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/* a token is an int, custom tokens start at this - single-char tokens are
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* simply represented by their ascii */
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#define START_CUSTOM 257
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enum Tokens
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{
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TOK_EQ = START_CUSTOM, TOK_NQ, TOK_GE, TOK_LE,
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TOK_AND, TOK_OR, TOK_LSH, TOK_RSH,
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TOK_DOC, TOK_STRING, TOK_CHAR, TOK_NUMBER, TOK_VALUE
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};
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/* all keywords in eolian, they can still be used as names (they're TOK_VALUE)
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* they just fill in the "kw" field of the token */
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#define KEYWORDS KW(class), KW(const), KW(enum), KW(return), KW(struct), \
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\
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KW(abstract), KW(constructor), KW(constructors), KW(data), \
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KW(destructor), KW(eo), KW(eo_prefix), KW(events), KW(free), \
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KW(get), KW(implements), KW(import), KW(interface), KW(keys), KW(legacy), \
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KW(legacy_prefix), KW(methods), KW(mixin), KW(own), KW(params), \
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KW(set), KW(type), KW(values), KW(var), KWAT(auto), KWAT(beta), \
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KWAT(c_only), KWAT(class), KWAT(const), KWAT(empty), KWAT(extern), \
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KWAT(free), KWAT(hot), KWAT(restart), KWAT(in), KWAT(inout), KWAT(nonull), KWAT(nullable), \
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KWAT(optional), KWAT(out), KWAT(private), KWAT(property), \
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KWAT(protected), KWAT(virtual_pure), KWAT(warn_unused), \
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\
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KW(byte), KW(ubyte), KW(char), KW(short), KW(ushort), KW(int), KW(uint), \
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KW(long), KW(ulong), KW(llong), KW(ullong), \
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\
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KW(int8), KW(uint8), KW(int16), KW(uint16), KW(int32), KW(uint32), \
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KW(int64), KW(uint64), KW(int128), KW(uint128), \
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\
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KW(size), KW(ssize), KW(intptr), KW(uintptr), KW(ptrdiff), \
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\
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KW(time), \
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\
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KW(float), KW(double), \
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\
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KW(bool), \
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\
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KW(void), \
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\
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KW(accessor), KW(array), KW(iterator), KW(hash), KW(list), \
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KW(promise), \
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KW(generic_value), \
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\
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KW(__builtin_event_cb), \
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KW(__undefined_type), \
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\
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KW(true), KW(false), KW(null)
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/* "regular" keyword and @ prefixed keyword */
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#define KW(x) KW_##x
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#define KWAT(x) KW_at_##x
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enum Keywords
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{
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KW_UNKNOWN = 0,
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KEYWORDS
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};
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#undef KW
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#undef KWAT
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enum Numbers
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{
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NUM_INT,
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NUM_UINT,
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NUM_LONG,
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NUM_ULONG,
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NUM_LLONG,
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NUM_ULLONG,
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NUM_FLOAT,
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NUM_DOUBLE
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};
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typedef union
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{
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char c;
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const char *s;
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signed int i;
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unsigned int u;
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signed long l;
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unsigned long ul;
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signed long long ll;
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unsigned long long ull;
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float f;
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double d;
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Eolian_Documentation *doc;
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} Eo_Token_Union;
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/* a token - "token" is the actual token id, "value" is the value of a token
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* if needed - NULL otherwise - for example the value of a TOK_VALUE, "kw"
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* is the keyword id if this is a keyword, it's 0 when not a keyword */
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typedef struct _Eo_Token
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{
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int token, kw;
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Eo_Token_Union value;
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} Eo_Token;
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typedef struct _Lexer_Ctx
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{
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int line, column;
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const char *linestr;
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Eo_Token token;
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} Lexer_Ctx;
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typedef struct _Eo_Lexer_Temps
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{
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Eolian_Class *kls;
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Eolian_Variable *var;
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Eina_List *str_bufs;
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Eina_List *type_defs;
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Eina_List *type_decls;
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Eina_List *expr_defs;
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Eina_List *strs;
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} Eo_Lexer_Temps;
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/* keeps all lexer state */
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typedef struct _Eo_Lexer
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{
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/* current character being tested */
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int current;
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/* column is token aware column number, for example when lexing a keyword
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* it points to the beginning of it after the lexing is done, icolumn is
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* token unaware, always pointing to current column */
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int column, icolumn;
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/* the current line number */
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int line_number;
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/* t: "normal" - token to lex into, "lookahead" - a lookahead token, used
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* to look one token past "t", when we need to check for a token after the
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* current one and use it in a conditional without consuming the current
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* token - used in pretty few cases - because we have one extra lookahead
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* token, that makes our grammar LL(2) - two tokens in total */
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Eo_Token t, lookahead;
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/* a string buffer used to keep contents of token currently being read,
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* if needed at all */
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Eina_Strbuf *buff;
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/* a handle pointing to a memory mapped file representing the file we're
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* currently lexing */
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Eina_File *handle;
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/* the source file name */
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const char *source;
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/* only basename */
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const char *filename;
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/* points to the current character in our mmapped file being lexed, just
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* incremented until the end */
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const char *stream;
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/* end pointer - required to check if we've reached past the file, as
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* mmapped data will give us no EOF */
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const char *stream_end;
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/* points to the current line being lexed, used by error messages to
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* display the current line with a caret at the respective column */
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const char *stream_line;
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/* this is jumped to when an error happens */
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jmp_buf err_jmp;
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/* saved context info */
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Eina_List *saved_ctxs;
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/* represents the temporaries, every object that is allocated by the
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* parser is temporarily put here so the resources can be reclaimed in
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* case of error - and it's nulled when it's written into a more permanent
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* position (e.g. as part of another struct, or into nodes */
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Eo_Lexer_Temps tmp;
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/* whether we allow lexing expression related tokens */
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Eina_Bool expr_mode;
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/* decimal point, by default '.' */
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char decpoint;
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} Eo_Lexer;
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int eo_lexer_init (void);
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int eo_lexer_shutdown (void);
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Eo_Lexer *eo_lexer_new (const char *source);
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void eo_lexer_free (Eo_Lexer *ls);
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/* gets a regular token, singlechar or one of TOK_something */
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int eo_lexer_get (Eo_Lexer *ls);
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/* lookahead token - see Eo_Lexer */
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int eo_lexer_lookahead (Eo_Lexer *ls);
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/* "throws" an error, with a custom message and custom token */
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void eo_lexer_lex_error (Eo_Lexer *ls, const char *msg, int token);
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/* like above, but uses the lexstate->t.token, aka current token */
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void eo_lexer_syntax_error (Eo_Lexer *ls, const char *msg);
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/* turns the token into a string, writes into the given buffer */
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void eo_lexer_token_to_str (int token, char *buf);
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/* returns the string representation of a keyword */
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const char *eo_lexer_keyword_str_get(int kw);
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/* checks if the given keyword is a builtin type */
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Eina_Bool eo_lexer_is_type_keyword(int kw);
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/* gets a keyword id from the keyword string */
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int eo_lexer_keyword_str_to_id(const char *kw);
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/* gets the C type name for a builtin type name - e.g. uchar -> unsigned char */
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const char *eo_lexer_get_c_type (int kw);
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/* save, restore and clear context (line, column, line string) */
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void eo_lexer_context_push (Eo_Lexer *ls);
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void eo_lexer_context_pop (Eo_Lexer *ls);
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void eo_lexer_context_restore(Eo_Lexer *ls);
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void eo_lexer_context_clear (Eo_Lexer *ls);
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#endif /* __EO_LEXER_H__ */
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