374 lines
9.8 KiB
C++
374 lines
9.8 KiB
C++
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function Token *
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token_get(S64 i = 0){
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i += pctx->token_iter;
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if(i >= pctx->tokens.len){
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return &pctx->empty_token;
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}
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Token *result = &pctx->tokens[i];
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if(result->kind == TK_NewLine){
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pctx->indent = result->indent;
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}
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return result;
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}
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function Token *
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token_next(){
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Token *token = token_get();
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pctx->token_iter++;
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return token;
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}
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function Token *
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token_is(Token_Kind kind){
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Token *token = token_get();
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if(token->kind == kind){
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return token;
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}
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return 0;
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}
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function Token *
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token_match(Token_Kind kind){
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Token *token = token_get();
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if(token->kind == kind){
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return token_next();
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}
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return 0;
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}
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function Token *
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token_match_keyword(Intern_String string){
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Token *token = token_get();
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if(token->kind == TK_Keyword){
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if(string.str == token->intern_val.str){
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token = token_next();
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return token;
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}
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}
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return 0;
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}
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function void
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parsing_error(Token *token, const char *str, ...){
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Scratch scratch;
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STRING_FMT(scratch, str, string);
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// @Note(Krzosa): Print nice error message
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printf("\nError: %s", string.str);
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if(token){
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printf(" %s:%d\n", token->file.str, (S32)token->line);
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// @Note(Krzosa): Print error line
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{
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int i = 0;
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while(token->line_begin[i]!='\n' && token->line_begin[i]!=0) i++;
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printf("%.*s\n", i, token->line_begin);
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// @Note(Krzosa): Print error marker
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int token_i = token->str - token->line_begin;
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for(int i = 0; i < token_i-2; i++) printf(" ");
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printf("^^^^^^\n");
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}
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}
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__debugbreak();
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}
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function Token *
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token_expect(Token_Kind kind){
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Token *token = token_get();
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if(token->kind == kind){
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token = token_next();
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return token;
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}
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parsing_error(token, "Expected token of kind: [%s], got instead token of kind: [%s]", token_kind_string(kind).str, token_kind_string(token->kind).str);
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return 0;
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}
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//-----------------------------------------------------------------------------
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// Expression parsing
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//-----------------------------------------------------------------------------
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/*
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add = [+-]
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mul = [/%*]
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compare = == | != | >= | > | <= | <
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logical = [&|^] | && | ||
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unary = [&*-!~+] | ++ | --
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atom_expr = Int
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| Float
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| String
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| Identifier
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| 'cast' '(' typespec ',' expr ')'
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| 'size_type' '(' typespec ')'
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| 'size_expr' '(' expr ')'
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| '{' compound_expr '}'
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| '(' expr ')'
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| '(' ':' typespec ')' '{' compound_expr '}'
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postfix_expr = atom_expr ('[' expr ']' | '.' Identifier | ++ | -- | '(' expr_list ')')*
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unary_expr = unary ? unary_expr : atom_expr
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mul_expr = atom_expr (mul atom_expr)*
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add_expr = mul_expr (add mul_expr)*
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logical_expr = add_expr (logical add_expr)*
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compare_expr = logical_expr (compare logical_expr)*
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ternary_expr = compare_expr ('?' ternary_expr ':' ternary_expr)?
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expr = logical_expr
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Compound literals
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- (:[23]*Type){}
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- Type{}
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- { }
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*/
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function Ast_Expr *parse_expr(S64 rbp = 0);
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function Ast_Typespec *parse_typespec();
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function Ast_Expr *
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parse_expr_compound(){
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Scratch scratch;
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Token *pos = token_get();
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Array<Ast_Expr *> exprs = {scratch};
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while(!token_is(TK_CloseBrace)){
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Token *token = token_get();
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Ast_Expr *index = 0;
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Ast_Expr *name = 0;
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if(token_match(TK_OpenBracket)){
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index = parse_expr();
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token_expect(TK_CloseBracket);
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token_expect(TK_Assign);
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}
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else if(token_is(TK_Identifier)){
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token = token_next();
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name = ast_expr_identifier(token, token->intern_val);
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token_expect(TK_Assign);
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}
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Ast_Expr *item = parse_expr();
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Ast_Expr *item_comp = ast_expr_compound_item(token, index, name, item);
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exprs.add(item_comp);
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if(!token_match(TK_Comma)){
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break;
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}
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}
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token_expect(TK_CloseBrace);
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Ast_Expr *result = ast_expr_compound(pos, 0, exprs);
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return result;
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}
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function Ast_Expr *
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parse_expr_nud(Token *token){
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switch(token->kind){
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case TK_StringLit: return ast_expr_string(token, token->intern_val);
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case TK_Identifier: return ast_expr_identifier(token, token->intern_val);
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case TK_Integer: return ast_expr_integer(token, token->int_val);
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case TK_Keyword: {
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if(token->intern_val == keyword_cast){
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token_expect(TK_OpenParen);
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Ast_Expr *expr = parse_expr();
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token_expect(TK_Colon);
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Ast_Typespec *typespec = parse_typespec();
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token_expect(TK_CloseParen);
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return ast_expr_cast(token, expr, typespec);
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}
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else {
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parsing_error(token, "Unexpected keyword: [%s], expected keyword [cast]", token->intern_val.str);
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return 0;
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}
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}break;
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case TK_OpenBrace: return parse_expr_compound();
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case TK_OpenParen: {Ast_Expr *result = parse_expr(); token_expect(TK_CloseParen); return result;}
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default: parsing_error(token, "Unexpected token of kind: [%s] in expression", token_kind_string(token->kind).str); return 0;
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}
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}
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function S64
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op_precedence(Token_Kind kind){
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S64 result = pctx->pt[kind];
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return result;
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}
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function Ast_Expr *
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parse_expr_led(Token *op, Ast_Expr *left){
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enum{ Left_Associative, Right_Associative };
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S64 assoc = Left_Associative;
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Ast_Expr *right = parse_expr(op_precedence(op->kind) - assoc);
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switch(op->kind){
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case TK_Add: case TK_Mul: case TK_Sub: case TK_Div: return ast_expr_binary(left, right, op);
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default: parsing_error(op, "Unexpected token of kind: [%s] in expression", token_kind_string(op->kind).str); return 0;
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}
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}
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function Ast_Expr *
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parse_expr(S64 rbp){
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Token *token = token_next();
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Ast_Expr *left = parse_expr_nud(token);
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while(rbp < op_precedence(token_get()->kind)){
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token = token_next();
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left = parse_expr_led(token, left);
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}
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return left;
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}
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function S64
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expr_eval(Ast_Expr *expr){
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switch(expr->kind){
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case AK_Expr_Int: return expr->int_val;
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case AK_Expr_Binary : {
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S64 left = expr_eval(expr->binary.left);
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S64 right = expr_eval(expr->binary.right);
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switch(expr->binary.op){
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case TK_Add: return left + right;
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case TK_Sub: return left - right;
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case TK_Mul: return left * right;
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case TK_Div: return left / right;
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default: invalid_codepath;
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}
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}break;
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default: invalid_codepath;
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}
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return 0;
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}
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#define TEST_PARSER() \
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Scratch scratch(thread_ctx.scratch);\
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Parse_Ctx ctx = {}; \
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ctx.init(scratch, scratch); \
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pctx = &ctx
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function void
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test_parse_expr(){
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TEST_PARSER();
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struct Test{String str;S64 val;};
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Array<Test> exprs = {scratch};
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exprs.add({"(4+5)*2"_s, (4+5)*2});
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exprs.add({"4+5*2"_s, 4+5*2});
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exprs.add({"4*5+5"_s, 4*5+5});
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exprs.add({"4+5+5+3"_s, 4+5+5+3});
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Iter(exprs){
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lex_restream(&ctx, it->str, "test_expr"_s);
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Ast_Expr *result = parse_expr();
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S64 val = expr_eval(result);
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assert(val == it->val);
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}
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}
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//-----------------------------------------------------------------------------
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// Parsing declarations
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//-----------------------------------------------------------------------------
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function Ast_Typespec *
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parse_optional_type(){
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Ast_Typespec *result = 0;
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if(token_match(TK_Colon)) result = parse_typespec();
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return result;
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}
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function Ast_Typespec *
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parse_typespec_function(Token *token){
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Scratch scratch;
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Array<Ast_Typespec *> args = {scratch};
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if(!token_is(TK_CloseParen)) {
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for(;;) {
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args.add(parse_typespec());
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if(!token_match(TK_Comma)){
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break;
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}
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}
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}
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token_expect(TK_CloseParen);
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Ast_Typespec *ret = parse_optional_type();
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Ast_Typespec *result = ast_typespec_func(token, ret, args);
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return result;
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}
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// [10]*int - Array of 10 pointers to ints
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function Ast_Typespec *
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parse_typespec_recurse(){
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Token *token = token_get();
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if(token_match(TK_Mul)){
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Ast_Typespec *result = parse_typespec_recurse();
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result = ast_typespec_pointer(token, result);
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return result;
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}
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else if(token_match(TK_OpenBracket)){
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Ast_Expr *expr = parse_expr();
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token_expect(TK_CloseBracket);
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Ast_Typespec *result = parse_typespec_recurse();
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result = ast_typespec_array(token, result, expr);
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return result;
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}
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else if(token_match(TK_OpenParen)){
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Ast_Typespec *result = parse_typespec_function(token);
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return result;
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}
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else if(token_match(TK_Identifier)){
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Ast_Typespec *result = ast_typespec_name(token, token->intern_val);
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return result;
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}
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else{
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parsing_error(token, "Failed to parse type, unexpected token of kind", token_kind_string(token->kind).str);
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return 0;
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}
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}
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function Ast_Typespec *
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parse_typespec(){
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Ast_Typespec *result = parse_typespec_recurse();
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return result;
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}
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function Ast_Expr *
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parse_assign_expr(){
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Ast_Expr *result = 0;
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if(token_match(TK_Assign)) result = parse_expr();
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return result;
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}
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function Ast_Decl *
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parse_decl(){
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Ast_Decl *result = 0;
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if(token_is(TK_Identifier)){
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if(pctx->indent != 0) parsing_error(token_get(), "Top level declarations shouldn't be indented");
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Token *name = token_next();
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if(token_match(TK_DoubleColon)){ // Constant
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Ast_Expr *expr = parse_expr();
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result = ast_decl_const(name, name->intern_val, expr);
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}
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else if(token_match(TK_Colon)){
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Ast_Typespec *typespec = 0;
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Ast_Expr *expr = 0;
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if(!token_is(TK_Assign)) typespec = parse_typespec();
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if(token_match(TK_Assign)) expr = parse_expr();
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if(!expr && !typespec) parsing_error(name, "invalid declaration, no type or value");
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result = ast_decl_var(name, typespec, name->intern_val, expr);
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}
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else{
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Token *token = token_get();
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parsing_error(token, "Unexpected token: [%s] when parsing a declaration", token_kind_string(token->kind).str);
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}
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}
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return result;
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}
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function Ast_Package *
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parse_file(){
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Scratch scratch;
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Token *token = token_get();
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Array<Ast_Decl *>decls = {scratch};
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while(!token_is(TK_End)){
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while(token_match(TK_NewLine));
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Ast_Decl *decl = parse_decl();
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if(!decl) break;
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decls.add(decl);
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}
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Ast_Package *result = ast_package(token, token->file, decls);
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return result;
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}
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