gmqcc/lexer.h

#ifndef GMQCC_LEXER_HDR
#define GMQCC_LEXER_HDR
#include "gmqcc.h"

struct token {
    int ttype;
    char *value;
    union {
        vec3_t v;
        int i;
        qcfloat_t f;
        int t; /* type */
    } constval;
    lex_ctx_t ctx;
};

/* Lexer
 *
 */
enum {
    /* Other tokens which we can return: */
    TOKEN_NONE = 0,
    TOKEN_START = 128,

    TOKEN_IDENT,

    TOKEN_TYPENAME,

    TOKEN_OPERATOR,

    TOKEN_KEYWORD, /* loop */

    TOKEN_DOTS, /* 3 dots, ... */

    TOKEN_ATTRIBUTE_OPEN,  /* [[ */
    TOKEN_ATTRIBUTE_CLOSE, /* ]] */

    TOKEN_VA_ARGS, /* for the ftepp only */
    TOKEN_VA_ARGS_ARRAY, /* for the ftepp only */
    TOKEN_VA_COUNT,     /* to get the count of vaargs */

    TOKEN_STRINGCONST, /* not the typename but an actual "string" */
    TOKEN_CHARCONST,
    TOKEN_VECTORCONST,
    TOKEN_INTCONST,
    TOKEN_FLOATCONST,

    TOKEN_WHITE,
    TOKEN_EOL,

    /* if we add additional tokens before this, the exposed API
     * should not be broken anyway, but EOF/ERROR/... should
     * still be at the bottom
     */
    TOKEN_EOF = 1024,

    /* We use '< TOKEN_ERROR', so TOKEN_FATAL must come after it and any
     * other error related tokens as well
     */
    TOKEN_ERROR,
    TOKEN_FATAL /* internal error, eg out of memory */
};

struct frame_macro {
    char *name;
    int value;
};

struct lex_file {
    FILE  *file;
    const char *open_string;
    size_t      open_string_length;
    size_t      open_string_pos;

    char   *name;
    size_t  line;
    size_t  sline; /* line at the start of a token */
    size_t  column;

    int     peek[256];
    size_t  peekpos;

    bool    eof;

    token   tok; /* not a pointer anymore */

    struct {
        unsigned noops:1;
        unsigned nodigraphs:1; /* used when lexing string constants */
        unsigned preprocessing:1; /* whitespace and EOLs become actual tokens */
        unsigned mergelines:1; /* backslash at the end of a line escapes the newline */
    } flags; /* sizeof == 1 */

    int framevalue;
    frame_macro *frames;
    char *modelname;

    size_t push_line;
};

lex_file* lex_open (const char *file);
lex_file* lex_open_string(const char *str, size_t len, const char *name);
void      lex_close(lex_file   *lex);
int       lex_do   (lex_file   *lex);
void      lex_cleanup(void);

/* Parser
 *
 */

enum {
    ASSOC_LEFT,
    ASSOC_RIGHT
};

#define OP_SUFFIX 1
#define OP_PREFIX 2

struct oper_info {
    const char   *op;
    unsigned int operands;
    unsigned int id;
    unsigned int assoc;
    signed int   prec;
    unsigned int flags;
    bool         folds;
};

/*
 * Explicit uint8_t casts since the left operand of shift operator cannot
 * be negative, even though it won't happen, this supresses the future
 * possibility.
 */
#define opid1(a)     ((uint8_t)a)
#define opid2(a,b)   (((uint8_t)a<<8) |(uint8_t)b)
#define opid3(a,b,c) (((uint8_t)a<<16)|((uint8_t)b<<8)|(uint8_t)c)

static const oper_info c_operators[] = {
    { "(",       0, opid1('('),         ASSOC_LEFT,  99, OP_PREFIX, false}, /* paren expression - non function call */
    { "_length", 1, opid3('l','e','n'), ASSOC_RIGHT, 98, OP_PREFIX, true},

    { "++",     1, opid3('S','+','+'), ASSOC_LEFT,  17, OP_SUFFIX, false},
    { "--",     1, opid3('S','-','-'), ASSOC_LEFT,  17, OP_SUFFIX, false},
    { ".",      2, opid1('.'),         ASSOC_LEFT,  17, 0,         false},
    { "(",      0, opid1('('),         ASSOC_LEFT,  17, 0,         false}, /* function call */
    { "[",      2, opid1('['),         ASSOC_LEFT,  17, 0,         false}, /* array subscript */

    { "++",     1, opid3('+','+','P'), ASSOC_RIGHT, 16, OP_PREFIX, false},
    { "--",     1, opid3('-','-','P'), ASSOC_RIGHT, 16, OP_PREFIX, false},

    { "**",     2, opid2('*','*'),     ASSOC_RIGHT, 14, 0,         true},
    { "!",      1, opid2('!','P'),     ASSOC_RIGHT, 14, OP_PREFIX, true},
    { "~",      1, opid2('~','P'),     ASSOC_RIGHT, 14, OP_PREFIX, true},
    { "+",      1, opid2('+','P'),     ASSOC_RIGHT, 14, OP_PREFIX, false},
    { "-",      1, opid2('-','P'),     ASSOC_RIGHT, 14, OP_PREFIX, true},
/*  { "&",      1, opid2('&','P'),     ASSOC_RIGHT, 14, OP_PREFIX, false}, */

    { "*",      2, opid1('*'),         ASSOC_LEFT,  13, 0,         true},
    { "/",      2, opid1('/'),         ASSOC_LEFT,  13, 0,         true},
    { "%",      2, opid1('%'),         ASSOC_LEFT,  13, 0,         true},
    { "><",     2, opid2('>','<'),     ASSOC_LEFT,  13, 0,         true},

    { "+",      2, opid1('+'),         ASSOC_LEFT,  12, 0,         true},
    { "-",      2, opid1('-'),         ASSOC_LEFT,  12, 0,         true},

    { "<<",     2, opid2('<','<'),     ASSOC_LEFT,  11, 0,         true},
    { ">>",     2, opid2('>','>'),     ASSOC_LEFT,  11, 0,         true},

    { "<",      2, opid1('<'),         ASSOC_LEFT,  10, 0,         false},
    { ">",      2, opid1('>'),         ASSOC_LEFT,  10, 0,         false},
    { "<=>",    2, opid3('<','=','>'), ASSOC_LEFT,  10, 0,         true},
    { "<=",     2, opid2('<','='),     ASSOC_LEFT,  10, 0,         false},
    { ">=",     2, opid2('>','='),     ASSOC_LEFT,  10, 0,         false},

    { "==",     2, opid2('=','='),     ASSOC_LEFT,  9,  0,         true},
    { "!=",     2, opid2('!','='),     ASSOC_LEFT,  9,  0,         true},

    { "&",      2, opid1('&'),         ASSOC_LEFT,  8,  0,         true},

    { "^",      2, opid1('^'),         ASSOC_LEFT,  7,  0,         true},

    { "|",      2, opid1('|'),         ASSOC_LEFT,  6,  0,         true},

    { "&&",     2, opid2('&','&'),     ASSOC_LEFT,  5,  0,         true},

    { "||",     2, opid2('|','|'),     ASSOC_LEFT,  4,  0,         true},

    { "?",      3, opid2('?',':'),     ASSOC_RIGHT, 3,  0,         true},

    { "=",      2, opid1('='),         ASSOC_RIGHT, 2,  0,         false},
    { "+=",     2, opid2('+','='),     ASSOC_RIGHT, 2,  0,         false},
    { "-=",     2, opid2('-','='),     ASSOC_RIGHT, 2,  0,         false},
    { "*=",     2, opid2('*','='),     ASSOC_RIGHT, 2,  0,         false},
    { "/=",     2, opid2('/','='),     ASSOC_RIGHT, 2,  0,         false},
    { "%=",     2, opid2('%','='),     ASSOC_RIGHT, 2,  0,         false},
    { ">>=",    2, opid3('>','>','='), ASSOC_RIGHT, 2,  0,         false},
    { "<<=",    2, opid3('<','<','='), ASSOC_RIGHT, 2,  0,         false},
    { "&=",     2, opid2('&','='),     ASSOC_RIGHT, 2,  0,         false},
    { "^=",     2, opid2('^','='),     ASSOC_RIGHT, 2,  0,         false},
    { "|=",     2, opid2('|','='),     ASSOC_RIGHT, 2,  0,         false},

    { ":",      0, opid2(':','?'),     ASSOC_RIGHT, 1,  0,         false},

    { ",",      2, opid1(','),         ASSOC_LEFT,  0,  0,         false}
};

static const oper_info fte_operators[] = {
    { "(",   0, opid1('('),         ASSOC_LEFT,  99, OP_PREFIX, false}, /* paren expression - non function call */

    { "++",  1, opid3('S','+','+'), ASSOC_LEFT,  15, OP_SUFFIX, false},
    { "--",  1, opid3('S','-','-'), ASSOC_LEFT,  15, OP_SUFFIX, false},
    { ".",   2, opid1('.'),         ASSOC_LEFT,  15, 0,         false},
    { "(",   0, opid1('('),         ASSOC_LEFT,  15, 0,         false}, /* function call */
    { "[",   2, opid1('['),         ASSOC_LEFT,  15, 0,         false}, /* array subscript */

    { "!",   1, opid2('!','P'),     ASSOC_RIGHT, 14, OP_PREFIX, true},
    { "+",   1, opid2('+','P'),     ASSOC_RIGHT, 14, OP_PREFIX, false},
    { "-",   1, opid2('-','P'),     ASSOC_RIGHT, 14, OP_PREFIX, true},
    { "++",  1, opid3('+','+','P'), ASSOC_RIGHT, 14, OP_PREFIX, false},
    { "--",  1, opid3('-','-','P'), ASSOC_RIGHT, 14, OP_PREFIX, false},

    { "*",   2, opid1('*'),         ASSOC_LEFT,  13, 0,         true},
    { "/",   2, opid1('/'),         ASSOC_LEFT,  13, 0,         true},
    { "&",   2, opid1('&'),         ASSOC_LEFT,  13, 0,         true},
    { "|",   2, opid1('|'),         ASSOC_LEFT,  13, 0,         true},

    { "+",   2, opid1('+'),         ASSOC_LEFT,  12, 0,         true},
    { "-",   2, opid1('-'),         ASSOC_LEFT,  12, 0,         true},

    { "<<",  2, opid2('<','<'),     ASSOC_LEFT,  11, 0,         true},
    { ">>",  2, opid2('>','>'),     ASSOC_LEFT,  11, 0,         true},

    { "<",   2, opid1('<'),         ASSOC_LEFT,  10, 0,         false},
    { ">",   2, opid1('>'),         ASSOC_LEFT,  10, 0,         false},
    { "<=",  2, opid2('<','='),     ASSOC_LEFT,  10, 0,         false},
    { ">=",  2, opid2('>','='),     ASSOC_LEFT,  10, 0,         false},
    { "==",  2, opid2('=','='),     ASSOC_LEFT,  10, 0,         true},
    { "!=",  2, opid2('!','='),     ASSOC_LEFT,  10, 0,         true},

    { "?",   3, opid2('?',':'),     ASSOC_RIGHT, 9,  0,         true},

    { "=",   2, opid1('='),         ASSOC_RIGHT, 8,  0,         false},
    { "+=",  2, opid2('+','='),     ASSOC_RIGHT, 8,  0,         false},
    { "-=",  2, opid2('-','='),     ASSOC_RIGHT, 8,  0,         false},
    { "*=",  2, opid2('*','='),     ASSOC_RIGHT, 8,  0,         false},
    { "/=",  2, opid2('/','='),     ASSOC_RIGHT, 8,  0,         false},
    { "%=",  2, opid2('%','='),     ASSOC_RIGHT, 8,  0,         false},
    { "&=",  2, opid2('&','='),     ASSOC_RIGHT, 8,  0,         false},
    { "|=",  2, opid2('|','='),     ASSOC_RIGHT, 8,  0,         false},
    { "&~=", 2, opid3('&','~','='), ASSOC_RIGHT, 8,  0,         false},

    { "&&",  2, opid2('&','&'),     ASSOC_LEFT,  5,  0,         true},
    { "||",  2, opid2('|','|'),     ASSOC_LEFT,  5,  0,         true},

    /* Leave precedence 3 for : with -fcorrect-ternary */
    { ",",   2, opid1(','),         ASSOC_LEFT,  2,  0,         false},
    { ":",   0, opid2(':','?'),     ASSOC_RIGHT, 1,  0,         false}
};

static const oper_info qcc_operators[] = {
    { "(",   0, opid1('('),         ASSOC_LEFT,  99, OP_PREFIX, false}, /* paren expression - non function call */

    { ".",   2, opid1('.'),         ASSOC_LEFT,  15, 0,         false},
    { "(",   0, opid1('('),         ASSOC_LEFT,  15, 0,         false}, /* function call */
    { "[",   2, opid1('['),         ASSOC_LEFT,  15, 0,         false}, /* array subscript */

    { "!",   1, opid2('!','P'),     ASSOC_RIGHT, 14, OP_PREFIX, true},
    { "+",   1, opid2('+','P'),     ASSOC_RIGHT, 14, OP_PREFIX, false},
    { "-",   1, opid2('-','P'),     ASSOC_RIGHT, 14, OP_PREFIX, true},

    { "*",   2, opid1('*'),         ASSOC_LEFT,  13, 0,         true},
    { "/",   2, opid1('/'),         ASSOC_LEFT,  13, 0,         true},
    { "&",   2, opid1('&'),         ASSOC_LEFT,  13, 0,         true},
    { "|",   2, opid1('|'),         ASSOC_LEFT,  13, 0,         true},

    { "+",   2, opid1('+'),         ASSOC_LEFT,  12, 0,         true},
    { "-",   2, opid1('-'),         ASSOC_LEFT,  12, 0,         true},

    { "<",   2, opid1('<'),         ASSOC_LEFT,  10, 0,         false},
    { ">",   2, opid1('>'),         ASSOC_LEFT,  10, 0,         false},
    { "<=",  2, opid2('<','='),     ASSOC_LEFT,  10, 0,         false},
    { ">=",  2, opid2('>','='),     ASSOC_LEFT,  10, 0,         false},
    { "==",  2, opid2('=','='),     ASSOC_LEFT,  10, 0,         true},
    { "!=",  2, opid2('!','='),     ASSOC_LEFT,  10, 0,         true},

    { "=",   2, opid1('='),         ASSOC_RIGHT, 8,  0,         false},
    { "+=",  2, opid2('+','='),     ASSOC_RIGHT, 8,  0,         false},
    { "-=",  2, opid2('-','='),     ASSOC_RIGHT, 8,  0,         false},
    { "*=",  2, opid2('*','='),     ASSOC_RIGHT, 8,  0,         false},
    { "/=",  2, opid2('/','='),     ASSOC_RIGHT, 8,  0,         false},
    { "%=",  2, opid2('%','='),     ASSOC_RIGHT, 8,  0,         false},
    { "&=",  2, opid2('&','='),     ASSOC_RIGHT, 8,  0,         false},
    { "|=",  2, opid2('|','='),     ASSOC_RIGHT, 8,  0,         false},

    { "&&",  2, opid2('&','&'),     ASSOC_LEFT,  5,  0,         true},
    { "||",  2, opid2('|','|'),     ASSOC_LEFT,  5,  0,         true},

    { ",",   2, opid1(','),         ASSOC_LEFT,  2,  0,         false},
};
extern const oper_info *operators;
extern size_t           operator_count;

#endif