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e0e8170fe6
Unlike macros, REPTs and INCLUDEs, this recursion depth is independent. This is intentional, because string expansions work very differently. While it's easy to know when a string expansion begins, checking where it ends is much more complicated, since the expansion's contents are simply injected back into the lex buffer. Therefore, the depth has to be checked after lexing took place. Because of this, the placement of the expansion end check is somewhat haphazard, but I think it's good. While I have no certainty, all tests ended with all expansions properly ended, and I couldn't find any pitfalls. Finally, `pCurrentStringExpansion` has been made global so error printing can use it to tell the user if an error occurred inside of an expansion.
87 lines
2.2 KiB
C
87 lines
2.2 KiB
C
/*
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* This file is part of RGBDS.
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*
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* Copyright (c) 1997-2018, Carsten Sorensen and RGBDS contributors.
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*
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* SPDX-License-Identifier: MIT
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*/
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#ifndef RGBDS_ASM_LEXER_H
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#define RGBDS_ASM_LEXER_H
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#include <stdint.h>
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#include <stdio.h>
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#define LEXHASHSIZE (1 << 11)
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#define MAXSTRLEN 255
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struct sLexInitString {
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char *tzName;
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uint32_t nToken;
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};
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struct sLexFloat {
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uint32_t (*Callback)(char *s, uint32_t size);
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uint32_t nToken;
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};
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struct yy_buffer_state {
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/* Actual starting address */
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char *pBufferRealStart;
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/* Address where the data is initially written after a safety margin */
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char *pBufferStart;
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char *pBuffer;
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size_t nBufferSize;
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uint32_t oAtLineStart;
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};
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enum eLexerState {
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LEX_STATE_NORMAL,
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LEX_STATE_MACROARGS
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};
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struct sStringExpansionPos {
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char *tzName;
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char *pBuffer;
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char *pBufferPos;
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struct sStringExpansionPos *pParent;
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};
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#define INITIAL 0
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#define macroarg 3
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typedef struct yy_buffer_state *YY_BUFFER_STATE;
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void setup_lexer(void);
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void yy_set_state(enum eLexerState i);
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YY_BUFFER_STATE yy_create_buffer(FILE *f);
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YY_BUFFER_STATE yy_scan_bytes(char *mem, uint32_t size);
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void yy_delete_buffer(YY_BUFFER_STATE buf);
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void yy_switch_to_buffer(YY_BUFFER_STATE buf);
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uint32_t lex_FloatAlloc(const struct sLexFloat *tok);
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void lex_FloatAddRange(uint32_t id, uint16_t start, uint16_t end);
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void lex_FloatDeleteRange(uint32_t id, uint16_t start, uint16_t end);
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void lex_FloatAddFirstRange(uint32_t id, uint16_t start, uint16_t end);
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void lex_FloatDeleteFirstRange(uint32_t id, uint16_t start, uint16_t end);
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void lex_FloatAddSecondRange(uint32_t id, uint16_t start, uint16_t end);
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void lex_FloatDeleteSecondRange(uint32_t id, uint16_t start, uint16_t end);
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void lex_Init(void);
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void lex_AddStrings(const struct sLexInitString *lex);
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void lex_SetBuffer(char *buffer, uint32_t len);
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void lex_BeginStringExpansion(const char *tzName);
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int yywrap(void);
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int yylex(void);
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void yyunput(char c);
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void yyunputstr(const char *s);
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void yyskipbytes(uint32_t count);
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void yyunputbytes(uint32_t count);
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extern YY_BUFFER_STATE pCurrentBuffer;
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extern struct sStringExpansionPos *pCurrentStringExpansion;
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void upperstring(char *s);
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void lowerstring(char *s);
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#endif /* RGBDS_ASM_LEXER_H */
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