5 * Permission is hereby granted, free of charge, to any person obtaining a copy of
6 * this software and associated documentation files (the "Software"), to deal in
7 * the Software without restriction, including without limitation the rights to
8 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
9 * of the Software, and to permit persons to whom the Software is furnished to do
10 * so, subject to the following conditions:
12 * The above copyright notice and this permission notice shall be included in all
13 * copies or substantial portions of the Software.
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
25 * Following parse states:
26 * ASM_FUNCTION -- in a function accepting input statements
35 char *name; /* name of constant */
36 int offset; /* location in globals */
38 VECTOR_MAKE(globals, assembly_constants);
41 * Assembly text processing: this handles the internal collection
42 * of text to allow parsing and assemblation.
44 static char *const asm_getline(size_t *byte, FILE *fp) {
46 size_t read = util_getline(&line, byte, fp);
56 * Entire external interface for main.c - to perform actual assemblation
59 void asm_init(const char *file, FILE **fp) {
60 *fp = fopen(file, "r");
63 void asm_close(FILE *fp) {
69 for (; i < assembly_constants_elements; i++)
70 mem_d(assembly_constants_data[i].name);
71 mem_d(assembly_constants_data);
75 * Parses a type, could be global or not depending on the
76 * assembly state: global scope with assignments are constants.
77 * globals with no assignments are globals. Function body types
80 static inline bool asm_parse_type(const char *skip, size_t line, asm_state *state) {
81 if (!(strstr(skip, "FLOAT:") == &skip[0]) &&
82 (strstr(skip, "VECTOR:") == &skip[0]) &&
83 (strstr(skip, "ENTITY:") == &skip[0]) &&
84 (strstr(skip, "FIELD:") == &skip[0]) &&
85 (strstr(skip, "STRING:") == &skip[0])) return false;
87 /* TODO: determine if constant, global, or local */
89 /* VECTOR */ case 'V': {
90 const char *find = skip + 7;
91 while (*find == ' ' || *find == '\t') find++;
92 printf("found VECTOR %s\n", find);
95 /* ENTITY */ case 'E': {
96 const char *find = skip + 7;
97 while (*find == ' ' || *find == '\t') find++;
98 printf("found ENTITY %s\n", find);
101 /* STRING */ case 'S': {
102 const char *find = skip + 7;
103 while (*find == ' ' || *find == '\t') find++;
104 printf("found STRING %s\n", find);
113 * Parses a function: trivial case, handles occurances of duplicated
114 * names among other things. Ensures valid name as well, and even
115 * internal engine function selection.
117 static inline bool asm_parse_func(const char *skip, size_t line, asm_state *state) {
118 if (*state == ASM_FUNCTION && (strstr(skip, "FUNCTION:") == &skip[0]))
121 if (strstr(skip, "FUNCTION:") == &skip[0]) {
122 char *copy = util_strsws(skip+10);
123 char *name = util_strchp(copy, strchr(copy, '\0'));
125 /* TODO: failure system, missing name */
127 printf("expected name on function\n");
132 /* TODO: failure system, invalid name */
133 if (!isalpha(*name) || util_strupper(name)) {
134 printf("invalid identifer for function name\n");
141 * Function could be internal function, look for $
144 if (strchr(name, ',')) {
145 char *find = strchr(name, ',') + 1;
147 /* skip whitespace */
148 while (*find == ' ' || *find == '\t')
152 printf("expected $ for internal function selection, got %s instead\n", find);
158 if (!isdigit(*find)) {
159 printf("invalid internal identifier, expected valid number\n");
165 * Now add the following items to the code system:
167 * definition (optional)
171 code_functions_add((prog_section_function){
172 -atoi(find), /* needs to be negated */
174 .name = code_chars_elements,
177 code_defs_add((prog_section_def){
178 .type = TYPE_FUNCTION,
179 .offset = code_globals_elements,
180 .name = code_chars_elements
182 code_globals_add(code_chars_elements);
184 code_chars_put(name, strlen(name));
185 code_chars_add('\0');
188 * Sanatize the numerical constant used to select the
189 * internal function. Must ensure it's all numeric, since
190 * atoi can silently drop characters from a string and still
191 * produce a valid constant that would lead to runtime problems.
193 if (util_strdigit(find))
194 printf("found internal function %s, -%d\n", name, atoi(find));
196 printf("invalid internal function identifier, must be all numeric\n");
199 /* TODO: function bodies */
209 void asm_parse(FILE *fp) {
212 long line = 1; /* current line */
213 size_t size = 0; /* size of line */
214 asm_state state = ASM_NULL;
221 util_debug("ASM", x); \
222 } while (0); continue
224 while ((data = asm_getline (&size, fp)) != NULL) {
225 char *copy = util_strsws(data); /* skip whitespace */
226 skip = util_strrnl(copy); /* delete newline */
229 if(asm_parse_type(skip, line, &state)){ asm_end("asm_parse_type\n"); }
231 if(asm_parse_func(skip, line, &state)){ asm_end("asm_parse_func\n"); }
233 /* statement closure */
234 if (state == ASM_FUNCTION && (
235 (strstr(skip, "DONE") == &skip[0])||
236 (strstr(skip, "RETURN") == &skip[0]))) state = ASM_NULL;
238 /* TODO: everything */
240 asm_end("asm_parse_end\n");