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- #include "parser.h"
- #include "stdlib.h"
- #include "stdio.h"
- #include "yacc.tab.h"
- #include "symtable.h"
- #include "structtable.h"
- #include <string.h>
- void print_node(FILE *fd, struct ast_node *n);
- void print_identifier(FILE *fd, struct ast_node *node, int include_type, int exclude_last_child);
- // file descriptor for global data
- FILE *fd_global;
- /* returns the string interpretation of a token
- */
- char *parse_vartype(int token) {
- switch (token) {
- case DD_KEYWORD_INT: return "int";
- case DD_KEYWORD_FLOAT: return "float";
- case DD_KEYWORD_STRUCT: return "struct";
- case DD_KEYWORD_VOID: return "void";
- default: return "void";
- }
- }
- /* print arguments for a function
- * node: group containing arguments
- * include_type: if arguments should include its type
- * start_with_comma: if it should include comma before first argument
- * (in case there are other arguments before this)
- */
- void print_arguments(FILE *fd, struct ast_node *node, int start_with_comma) {
- for (int i = 0; i < node->children.elements; i++) {
- if (start_with_comma || i != 0) fprintf(fd, ", ");
- struct ast_node *element = dd_da_get(&node->children, i);
- print_identifier(fd, element, 1, 0);
- }
- }
- void print_argument_expressions(FILE *fd, struct ast_node *node, int start_with_comma) {
- for (int i = 0; i < node->children.elements; i++) {
- if (start_with_comma || i != 0) fprintf(fd, ", ");
- struct ast_node *element = dd_da_get(&node->children, i);
- print_node(fd, element);
- }
- }
- void print_identifier(FILE *fd, struct ast_node *node, int include_type, int exclude_last_child) {
- struct entry *e = symtable_entryat(node->value);
- if (!e) {
- fprintf(stderr, "parser_c: print_identifier: could not find symtable entry at %d\n", node->value);
- exit(-1);
- }
- // if type is needed, print it
- if (include_type) {
- fprintf(fd, "%s ", parse_vartype(e->token));
- if (e->token == DD_KEYWORD_STRUCT) fprintf(fd, " %s *", struct_entryat(e->value)->name);
- }
- // internal variable - width
- if (e->token == DD_INTERNAL_WIDTH) {
- fprintf(fd, "DD_GAME_WIDTH", e->lexptr);
- }
- else
- // internal variable - height
- if (e->token == DD_INTERNAL_HEIGHT) {
- fprintf(fd, "DD_GAME_HEIGHT", e->lexptr);
- }
- // normal variable
- else {
- if (exclude_last_child && node->children.elements == 0) return;
- else fprintf(fd, "%s", e->lexptr);
- }
- for (int i = 0; i < node->children.elements; i++) {
- // some variables print less of the children
- if (exclude_last_child && i+1 >= node->children.elements) break;
- struct ast_node *child = dd_da_get(&node->children, i);
- struct entry *e = symtable_entryat(child->value);
- if (!e) {
- fprintf(stderr, "parser_c: print_identifier children: could not find symtable entry at %d\n", child->value);
- exit(-1);
- }
- fprintf(fd, "->%s", e->lexptr);
- }
- }
- void print_node(FILE *fd, struct ast_node *n) {
- // parse node
- struct entry *e;
- struct ast_node *child;
- struct struct_entry *se;
- int i;
- switch (n->node_type) {
- /* the game itself, parent of all nodes
- * contains statements, just print them all one by one
- */
- case AST_GROUP:
- case AST_GROUP_STATEMENTS:
- case AST_GAME:
- for (int i = 0; i < n->children.elements; i++) {
- print_node(fd, (struct ast_node *) dd_da_get(&n->children, i));
- if (n->node_type == AST_GROUP_STATEMENTS) fprintf(fd, ";\n");
- }
- break;
- /* identifier, just print it
- */
- case AST_IDENTIFIER: print_identifier(fd, n, 0, 0); break;
- /* number
- */
- case AST_NUMBER: fprintf(fd, "%d", n->value); break;
- /* string
- * get value from symbol table
- */
- case AST_STRING: {
- struct entry *e = symtable_entryat(n->value);
- if (!e) {
- fprintf(stderr, "parser_c: string: could not find symtable entry at %d\n", n->value);
- exit(-1);
- }
- fprintf(fd, "%s", e->lexptr);
- break;
- }
- /* definition
- * <type> child1;
- */
- case AST_DEFINITION: {
- struct ast_node *child = dd_da_get(&n->children, 0);
- print_identifier(fd, child, 1, 0);
- fprintf(fd, ";\n");
- break;
- }
- /* function definition
- */
- case AST_FUNCTION_DEFINITION: {
- e = symtable_entryat(n->value);
- if (!e) {
- fprintf(stderr, "parser_c: function_definition: could not find symtable entry at %d\n", n->value);
- exit(-1);
- }
- print_identifier(fd, n, 1, 0);
- fprintf(fd, "(");
- // arguments
- struct ast_node *group = dd_da_get(&n->children, 0);
- print_arguments(fd, group, 0);
- fprintf(fd, ") {\n", parse_vartype(e->token), e->lexptr);
- print_node(fd, (struct ast_node *) dd_da_get(&n->children, 1));
- fprintf(fd, "}\n");
- break;
- }
- /* function definition
- */
- case AST_FUNCTION_CALL: {
- struct ast_node *variable = dd_da_get(&n->children, 0);
- print_identifier(fd, variable, 0, 0);
- fprintf(fd, "(");
- /* called when a function from a struct is called
- * the struct is the first argument
- */
- if (variable->children.elements != 0) {
- print_identifier(fd, variable, 0, 1);
- }
- /* other arguments
- */
- struct ast_node *group = dd_da_get(&n->children, 1);
- print_argument_expressions(fd, group, variable->children.elements != 0);
- fprintf(fd, ")");
- break;
- }
- /* equality
- * child1 = child2;
- */
- case AST_ASSIGNMENT: {
- struct ast_node *identifier = dd_da_get(&n->children, 0);
- print_identifier(fd, identifier, 0, 0);
- fprintf(fd, " = ");
- print_node(fd, (struct ast_node *) dd_da_get(&n->children, 1));
- fprintf(fd, "");
- break;
- }
- case AST_OPERATOR_BINARY:
- fprintf(fd, "(");
- print_node(fd, (struct ast_node *) dd_da_get(&n->children, 0));
- char *type;
- switch (n->value) {
- case '<': type = "<"; break;
- case '>': type = ">"; break;
- case '+': type = "+"; break;
- case '-': type = "-"; break;
- case '*': type = "*"; break;
- case '/': type = "/"; break;
- case '=': type = "="; break;
- case DD_OPERATOR_EQ: type = "=="; break;
- case DD_OPERATOR_LE: type = "<="; break;
- case DD_OPERATOR_GE: type = ">="; break;
- }
- fprintf(fd, " %s ", type);
- print_node(fd, (struct ast_node *) dd_da_get(&n->children, 1));
- fprintf(fd, ")");
- break;
- case AST_GROUP_EXPRESSIONS:
- fprintf(fd, "(");
- print_node(fd, (struct ast_node *) dd_da_get(&n->children, 0));
- fprintf(fd, ")");
- break;
- case AST_STRUCT:
- se = struct_entryat(n->value);
- if (!e) {
- fprintf(stderr, "parser_c: struct: could not find symtable entry at %d\n", n->value);
- exit(-1);
- }
- // init struct's appearence
- fprintf(fd, "struct %s {\n", se->name);
- if (se->parent >= 0) {
- fprintf(fd, " struct %s parent;\n", struct_entryat(se->parent)->name);
- }
- // parse struct's children
- struct ast_node *group = dd_da_get(&n->children, 0);
- for (int i = 0; i < group->children.elements; i++) {
- struct ast_node *child = dd_da_get(&group->children, i);
- // parse functions as signatures
- if (child->node_type == AST_FUNCTION_DEFINITION) {
- e = symtable_entryat(child->value);
- if (!e) {
- fprintf(stderr, "parser_c: struct function definition: "
- "could not find symtable entry at %d\n", n->value);
- exit(-1);
- }
- // is not override function
- if (e->value == 0) {
- fprintf(fd, "%s (*%s)(struct %s*", parse_vartype(e->token), e->lexptr, se->name);
- struct ast_node *group = dd_da_get(&child->children, 0);
- print_arguments(fd, group, 1);
- fprintf(fd, ");\n");
- }
- }
- // parse everything else as normal
- else {
- print_node(fd, child);
- }
- }
- fprintf(fd, "};\n");
- // forward declaration of create function, so it can be referenced
- fprintf(fd, "struct %s *%s_create();\n", se->name, se->name);
- // struct's functions
- for (int i = 0; i < group->children.elements; i++) {
- struct ast_node *child = dd_da_get(&group->children, i);
- if (child->node_type == AST_FUNCTION_DEFINITION) {
- e = symtable_entryat(child->value);
- if (!e) {
- fprintf(stderr, "parser_c: struct functions: "
- "could not find symtable entry at %d\n", child->value);
- exit(-1);
- }
- if (strcmp(e->lexptr, "init") == 0) continue;
- fprintf(fd, "void %s_%s(struct %s *this", se->name, e->lexptr, se->name);
- struct ast_node *group = dd_da_get(&child->children, 0);
- print_arguments(fd, group, 1);
- fprintf(fd, ") {\n");
- print_node(fd, (struct ast_node *) dd_da_get(&child->children, 1));
- fprintf(fd, "}\n");
- }
- }
- // struct's initialiser
- fprintf(fd, "void %s_init(struct %s *this) {\n", se->name, se->name);
- // there is parent, so initialise that
- if (se->parent >= 0) {
- fprintf(fd, " %s_init(&this->parent);\n", struct_entryat(se->parent)->name);
- }
- // init all structs
- // init based on ast children?
- for (int i = 0; i < group->children.elements; i++) {
- struct ast_node *child = dd_da_get(&group->children, i);
- if (child->node_type == AST_FUNCTION_DEFINITION) {
- e = symtable_entryat(child->value);
- if (!e) {
- fprintf(stderr, "parser_c: struct children: "
- "could not find symtable entry at %d\n", child->value);
- exit(-1);
- }
- // override
- if (e->value != 0) {
- fprintf(fd, " this->parent.%s = %s_%s;\n", e->lexptr, se->name, e->lexptr);
- }
- else
- // not `init`
- if (strcmp(e->lexptr, "init") != 0) {
- fprintf(fd, " this->%s = %s_%s;\n", e->lexptr, se->name, e->lexptr);
- }
- // `init` function has special rules
- else {
- struct ast_node *func_child = dd_da_get(&child->children, 1);
- print_node(fd, func_child);
- }
- } else
- if (child->node_type == AST_DEFINITION) {
- struct ast_node *child2 = dd_da_get(&child->children, 0);
- e = symtable_entryat(child2->value);
- if (!e) {
- fprintf(stderr, "parser_c: struct children definition: "
- "could not find symtable entry at %d\n", child2->value);
- exit(-1);
- }
- struct struct_entry *target_struct = struct_entryat(e->value);
- if (e->token == DD_KEYWORD_STRUCT) {
- fprintf(fd, " this->%s = %s_create();\n", e->lexptr, target_struct->name);
- }
- }
- }
- // close structs init
- fprintf(fd, "}\n");
- // struct's constructor
- fprintf(fd, "struct %s *%s_create() {\n", se->name, se->name);
- fprintf(fd, " struct %s *temp = malloc(sizeof(struct %s));\n", se->name, se->name);
- fprintf(fd, " %s_init(temp);\n", se->name, se->name);
- fprintf(fd, " return temp;\n");
- fprintf(fd, "}\n");
- break;
- /* if statement */
- case AST_IF:
- fprintf(fd, "if (");
- print_node(fd, dd_da_get(&n->children, 0));
- fprintf(fd, ") {\n");
- print_node(fd, dd_da_get(&n->children, 1));
- fprintf(fd, "}\n");
- break;
- } // switch
- }
- // responsible for creating a file and translating ast to target language
- void parse(const char *filename, struct ast_node *n) {
- fd_global = fopen(filename, "w");
- fprintf(fd_global, "#include <stdlib.h>\n");
- fprintf(fd_global, "#include \"world.h\"\n");
- fprintf(fd_global, "#include \"sprite.h\"\n");
- fprintf(fd_global, "#include \"vector2d.h\"\n");
- fprintf(fd_global, "#include \"dd_curves.h\"\n");
- fprintf(fd_global, "#include \"dd_math.h\"\n");
- fprintf(fd_global, "#include \"dd_engine_interface.h\"\n");
- print_node(fd_global, n);
- fclose(fd_global);
- }
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