/*
* Copyright (C) 2012
* Dale Weiler
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is furnished to do
* so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "gmqcc.h"
/* compile-time constant for type constants */
typedef struct {
char *name;
int type;
float value[3];
char *string; /* string value if constant is string literal */
} constant;
VECTOR_MAKE(constant, compile_constants);
void compile_constant_debug() {
int iter = 0;
for(; iter < compile_constants_elements; iter++) {
constant *c = &compile_constants_data[iter];
switch(c->type) {
case TYPE_FLOAT: printf("constant: %s FLOAT %f\n", c->name, c->value[0]); break;
case TYPE_VECTOR: printf("constant: %s VECTOR {%f,%f,%f}\n",c->name, c->value[0], c->value[1], c->value[2]); break;
case TYPE_STRING: printf("constant: %s STRING %s\n", c->name, c->string); break;
case TYPE_VOID: printf("constant: %s VOID %s\n", c->name, c->string); break;
}
}
}
/*
* Generates a parse tree out of the lexees generated by the lexer. This
* is where the tree is built. This is where valid check is performed.
*/
int parse_gen(struct lex_file *file) {
int token = 0;
while ((token = lex_token(file)) != ERROR_LEX && file->length >= 0) {
switch (token) {
case TOKEN_TYPEDEF: {
char *f; /* from */
char *t; /* to */
token = lex_token(file);
token = lex_token(file); f = util_strdup(file->lastok);
token = lex_token(file);
token = lex_token(file); t = util_strdup(file->lastok);
typedef_add(file, f, t);
mem_d(f);
mem_d(t);
token = lex_token(file);
if (token == ' ')
token = lex_token(file);
if (token != ';')
error(file, ERROR_PARSE, "Expected a `;` at end of typedef statement");
token = lex_token(file);
break;
}
case TOKEN_VOID: goto fall;
case TOKEN_STRING: goto fall;
case TOKEN_VECTOR: goto fall;
case TOKEN_ENTITY: goto fall;
case TOKEN_FLOAT: goto fall;
{
fall:;
char *name = NULL;
int type = token; /* story copy */
/* skip over space */
token = lex_token(file);
if (token == ' ')
token = lex_token(file);
/* save name */
name = util_strdup(file->lastok);
/* skip spaces */
token = lex_token(file);
if (token == ' ')
token = lex_token(file);
if (token == ';') {
/*
* Definitions go to the defs table, they don't have
* any sort of data with them yet.
*/
} else if (token == '=') {
token = lex_token(file);
if (token == ' ')
token = lex_token(file);
/* strings are in file->lastok */
switch (type) {
case TOKEN_VOID:
error(file, ERROR_PARSE, "Cannot assign value to type void\n");
/* TODO: Validate (end quote), strip quotes for constant add, name constant */
case TOKEN_STRING:
if (*file->lastok != '"')
error(file, ERROR_PARSE, "Expected a '\"' (quote) for string constant\n");
/* add the compile-time constant */
compile_constants_add((constant){
.name = util_strdup(name),
.type = TYPE_STRING,
.value = {0,0,0},
.string = util_strdup(file->lastok)
});
break;
/* TODO: name constant, old qc vec literals, whitespace fixes, name constant */
case TOKEN_VECTOR: {
float compile_calc_x = 0;
float compile_calc_y = 0;
float compile_calc_z = 0;
int compile_calc_d = 0; /* dot? */
int compile_calc_s = 0; /* sign (-, +) */
char compile_data[1024];
char *compile_eval = compile_data;
if (token != '{')
error(file, ERROR_PARSE, "Expected initializer list {} for vector constant\n");
/*
* This parses a single vector element: x,y & z. This will handle all the
* complicated mechanics of a vector, and can be extended as well. This
* is a rather large macro, and is #undef'd after it's use below.
*/
#define PARSE_VEC_ELEMENT(NAME, BIT) \
token = lex_token(file); \
if (token == ' ') \
token = lex_token(file); \
if (token == '.') \
compile_calc_d = 1; \
if (!isdigit(token) && !compile_calc_d && token != '+' && token != '-') \
error(file, ERROR_PARSE,"Invalid constant initializer element %c for vector, must be numeric\n", NAME); \
if (token == '+') \
compile_calc_s = '+'; \
if (token == '-' && !compile_calc_s) \
compile_calc_s = '-'; \
while (isdigit(token) || token == '.' || token == '+' || token == '-') { \
*compile_eval++ = token; \
token = lex_token(file); \
if (token == '.' && compile_calc_d) { \
error(file, ERROR_PARSE, "Invalid constant initializer element %c for vector, must be numeric.\n", NAME); \
token = lex_token(file); \
} \
if ((token == '-' || token == '+') && compile_calc_s) { \
error(file, ERROR_PARSE, "Invalid constant initializer sign for vector element %c\n", NAME); \
token = lex_token(file); \
} \
else if (token == '.' && !compile_calc_d) \
compile_calc_d = 1; \
else if (token == '-' && !compile_calc_s) \
compile_calc_s = '-'; \
else if (token == '+' && !compile_calc_s) \
compile_calc_s = '+'; \
} \
if (token == ' ') \
token = lex_token(file); \
if (NAME != 'z') { \
if (token != ',' && token != ' ') \
error(file, ERROR_PARSE, "invalid constant initializer element %c for vector (missing spaces, or comma delimited list?)\n", NAME); \
} else if (token != '}') { \
error(file, ERROR_PARSE, "Expected `}` on end of constant initialization for vector\n"); \
} \
compile_calc_##BIT = atof(compile_data); \
compile_calc_d = 0; \
compile_calc_s = 0; \
compile_eval = &compile_data[0]; \
memset(compile_data, 0, sizeof(compile_data))
/*
* Parse all elements using the macro above.
* We must undef the macro afterwards.
*/
PARSE_VEC_ELEMENT('x', x);
PARSE_VEC_ELEMENT('y', y);
PARSE_VEC_ELEMENT('z', z);
#undef PARSE_VEC_ELEMENT
/* Check for the semi-colon... */
token = lex_token(file);
if (token == ' ')
token = lex_token(file);
if (token != ';')
error(file, ERROR_PARSE, "Expected `;` on end of constant initialization for vector\n");
/* add the compile-time constant */
compile_constants_add((constant){
.name = util_strdup(name),
.type = TYPE_VECTOR,
.value = {
[0] = compile_calc_x,
[1] = compile_calc_y,
[2] = compile_calc_z
},
.string = NULL
});
break;
}
case TOKEN_ENTITY:
case TOKEN_FLOAT: /*TODO: validate, constant generation, name constant */
if (!isdigit(token))
error(file, ERROR_PARSE, "Expected numeric constant for float constant\n");
compile_constants_add((constant){
.name = util_strdup(name),
.type = TOKEN_FLOAT,
.value = {0,0,0},
.string = NULL
});
break;
}
} else if (token == '(') {
printf("FUNCTION ??\n");
}
mem_d(name);
}
/*
* From here down is all language punctuation: There is no
* need to actual create tokens from these because they're already
* tokenized as these individual tokens (which are in a special area
* of the ascii table which doesn't conflict with our other tokens
* which are higer than the ascii table.)
*/
case '#':
token = lex_token(file); /* skip '#' */
if (token == ' ')
token = lex_token(file);
/*
* If we make it here we found a directive, the supported
* directives so far are #include.
*/
if (strncmp(file->lastok, "include", sizeof("include")) == 0) {
/*
* We only suport include " ", not <> like in C (why?)
* because the latter is silly.
*/
while (*file->lastok != '"' && token != '\n')
token = lex_token(file);
if (token == '\n')
return error(file, ERROR_PARSE, "Invalid use of include preprocessor directive: wanted #include \"file.h\"\n");
char *copy = util_strdup(file->lastok);
struct lex_file *next = lex_include(file, copy);
if (!next) {
error(file, ERROR_INTERNAL, "Include subsystem failure\n");
exit (-1);
}
compile_constants_add((constant) {
.name = "#include",
.type = TYPE_VOID,
.value = {0,0,0},
.string = copy
});
parse_gen(next);
mem_d (copy);
lex_close(next);
}
/* skip all tokens to end of directive */
while (token != '\n')
token = lex_token(file);
break;
case LEX_IDENT:
token = lex_token(file);
break;
}
}
compile_constant_debug();
lex_reset(file);
/* free constants */
{
size_t i = 0;
for (; i < compile_constants_elements; i++) {
mem_d(compile_constants_data[i].name);
mem_d(compile_constants_data[i].string);
}
mem_d(compile_constants_data);
}
return 1;
}