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#include "../include/parser.h"
#include "../include/ast.h"
#include "../include/misc.h"
#include "../include/alloc.h"
#include <stdio.h>
static CHECK_RESULT int parser_parse_body(Parser *self, Ast *ast);
int parser_init(Parser *self) {
buffer_init(&self->ast_objects);
return_if_error(scoped_allocator_init(&self->allocator));
return PARSER_OK;
}
void parser_deinit(Parser *self) {
usize i;
for(i = 0; i < self->ast_objects.size / sizeof(Ast); ++i) {
ast_deinit((Ast*)&self->ast_objects.data[i]);
}
buffer_deinit(&self->ast_objects);
scoped_allocator_deinit(&self->allocator);
}
/*
LHS = 'const'|'var' IDENTIFIER
*/
static CHECK_RESULT int parser_parse_lhs(Parser *self, LhsExpr **result) {
bool isConst;
BufferView var_name;
*result = NULL;
return_if_error(tokenizer_consume_if(&self->tokenizer, TOK_CONST, &isConst));
if(!isConst) {
bool isVar;
return_if_error(tokenizer_consume_if(&self->tokenizer, TOK_VAR, &isVar));
if(!isVar)
return PARSER_OK;
}
return_if_error(tokenizer_accept(&self->tokenizer, TOK_IDENTIFIER));
var_name = self->tokenizer.value.identifier;
fprintf(stderr, "var name: %.*s\n", (int)var_name.size, var_name.data);
return_if_error(scoped_allocator_alloc(&self->allocator, sizeof(LhsExpr), (void**)result));
lhsexpr_init(*result, isConst, var_name);
return PARSER_OK;
}
/*
FUNC_DECL = '(' PARAM* ')' '{' BODY* '}'
*/
static CHECK_RESULT int parser_parse_function_decl(Parser *self, FunctionDecl **func_decl) {
bool result;
*func_decl = NULL;
return_if_error(tokenizer_consume_if(&self->tokenizer, TOK_OPEN_PAREN, &result));
if(!result)
return PARSER_OK;
/* TODO: Parse parameters */
return_if_error(tokenizer_accept(&self->tokenizer, TOK_CLOSING_PAREN));
/* TODO: Parse return types */
return_if_error(tokenizer_accept(&self->tokenizer, TOK_OPEN_BRACE));
return_if_error(scoped_allocator_alloc(&self->allocator, sizeof(FunctionDecl), (void**)func_decl));
funcdecl_init(*func_decl);
for(;;) {
Ast body_obj;
cleanup_if_error(tokenizer_consume_if(&self->tokenizer, TOK_CLOSING_BRACE, &result));
if(result)
break;
cleanup_if_error(parser_parse_body(self, &body_obj));
cleanup_if_error(funcdecl_add_to_body(*func_decl, body_obj));
}
return PARSER_OK;
cleanup:
*func_decl = NULL;
return PARSER_ERR;
}
/*
FUNC_CALL = IDENTIFIER '(' ARGS* ')'
*/
static CHECK_RESULT int parser_parse_function_call(Parser *self, FunctionCall **func_call) {
bool result;
BufferView func_name;
*func_call = NULL;
return_if_error(tokenizer_consume_if(&self->tokenizer, TOK_IDENTIFIER, &result));
if(!result)
return PARSER_OK;
func_name = self->tokenizer.value.identifier;
return_if_error(tokenizer_accept(&self->tokenizer, TOK_OPEN_PAREN));
/* TODO: Parse arguments */
return_if_error(tokenizer_accept(&self->tokenizer, TOK_CLOSING_PAREN));
return_if_error(scoped_allocator_alloc(&self->allocator, sizeof(FunctionCall), (void**)func_call));
funccall_init(*func_call, func_name);
return PARSER_OK;
}
/*
RHS = FUNC_DECL | FUNC_CALL
*/
static CHECK_RESULT int parser_parse_rhs(Parser *self, Ast *rhs_expr) {
FunctionDecl *func_decl;
FunctionCall *func_call;
Token token;
func_decl = NULL;
func_call = NULL;
return_if_error(parser_parse_function_decl(self, &func_decl));
if(func_decl) {
rhs_expr->type = AST_FUNCTION_DECL;
rhs_expr->value.func_decl = func_decl;
return PARSER_OK;
}
return_if_error(parser_parse_function_call(self, &func_call));
if(func_call) {
rhs_expr->type = AST_FUNCTION_CALL;
rhs_expr->value.func_call = func_call;
return PARSER_OK;
}
return_if_error(tokenizer_next(&self->tokenizer, &token));
/* TODO: Convert token to string */
tokenizer_print_error(&self->tokenizer, "Expected function declaration or function call, got token: %d");
return PARSER_UNEXPECTED_TOKEN;
}
/*
BODY = (LHS '=' RHS) |
RHS
*/
int parser_parse_body(Parser *self, Ast *ast) {
LhsExpr *lhs_expr;
Ast rhs_expr;
return_if_error(parser_parse_lhs(self, &lhs_expr));
if(lhs_expr)
return_if_error(tokenizer_accept(&self->tokenizer, TOK_EQUALS));
return_if_error(parser_parse_rhs(self, &rhs_expr));
if(lhs_expr) {
lhs_expr->rhs_expr = rhs_expr;
ast->type = AST_LHS;
ast->value.lhs_expr = lhs_expr;
} else {
*ast = rhs_expr;
}
return PARSER_OK;
}
/*
ROOT = BODY*
*/
int parser_parse_buffer(Parser *self, BufferView code_buffer) {
Ast ast;
return_if_error(tokenizer_init(&self->tokenizer, code_buffer));
for(;;) {
bool isEof;
return_if_error(tokenizer_consume_if(&self->tokenizer, TOK_END_OF_FILE, &isEof));
if(isEof)
break;
return_if_error(parser_parse_body(self, &ast));
return_if_error(buffer_append(&self->ast_objects, &ast, sizeof(ast)));
}
return PARSER_OK;
}
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