motiejus/zig
1
Fork 0
Code Releases Activity

parsing assignment operators

Browse Source
This commit is contained in:
Josh Wolfe
2015-12-12 19:07:29 -07:00
parent eb1542c102
commit 5cb5f5dbf6
4 changed files with 179 additions and 30 deletions
Download Patch File Download Diff File Expand all files Collapse all files

100
src/parser.cpp
View File

@@ -14,26 +14,38 @@
static const char *bin_op_str(BinOpType bin_op) {
switch (bin_op) {
case BinOpTypeInvalid: return "(invalid)";
case BinOpTypeBoolOr: return "||";
case BinOpTypeBoolAnd: return "&&";
case BinOpTypeCmpEq: return "==";
case BinOpTypeCmpNotEq: return "!=";
case BinOpTypeCmpLessThan: return "<";
case BinOpTypeCmpGreaterThan: return ">";
case BinOpTypeCmpLessOrEq: return "<=";
case BinOpTypeCmpGreaterOrEq: return ">=";
case BinOpTypeBinOr: return "|";
case BinOpTypeBinXor: return "^";
case BinOpTypeBinAnd: return "&";
case BinOpTypeBitShiftLeft: return "<<";
case BinOpTypeBitShiftRight: return ">>";
case BinOpTypeAdd: return "+";
case BinOpTypeSub: return "-";
case BinOpTypeMult: return "*";
case BinOpTypeDiv: return "/";
case BinOpTypeMod: return "%";
case BinOpTypeAssign: return "=";
case BinOpTypeInvalid: return "(invalid)";
case BinOpTypeBoolOr: return "||";
case BinOpTypeBoolAnd: return "&&";
case BinOpTypeCmpEq: return "==";
case BinOpTypeCmpNotEq: return "!=";
case BinOpTypeCmpLessThan: return "<";
case BinOpTypeCmpGreaterThan: return ">";
case BinOpTypeCmpLessOrEq: return "<=";
case BinOpTypeCmpGreaterOrEq: return ">=";
case BinOpTypeBinOr: return "|";
case BinOpTypeBinXor: return "^";
case BinOpTypeBinAnd: return "&";
case BinOpTypeBitShiftLeft: return "<<";
case BinOpTypeBitShiftRight: return ">>";
case BinOpTypeAdd: return "+";
case BinOpTypeSub: return "-";
case BinOpTypeMult: return "*";
case BinOpTypeDiv: return "/";
case BinOpTypeMod: return "%";
case BinOpTypeAssign: return "=";
case BinOpTypeAssignTimes: return "*=";
case BinOpTypeAssignDiv: return "/=";
case BinOpTypeAssignMod: return "%=";
case BinOpTypeAssignPlus: return "+=";
case BinOpTypeAssignMinus: return "-=";
case BinOpTypeAssignBitShiftLeft: return "<<=";
case BinOpTypeAssignBitShiftRight: return ">>=";
case BinOpTypeAssignBitAnd: return "&=";
case BinOpTypeAssignBitXor: return "^=";
case BinOpTypeAssignBitOr: return "|=";
case BinOpTypeAssignBoolAnd: return "&&=";
case BinOpTypeAssignBoolOr: return "||=";
}
zig_unreachable();
}
@@ -103,7 +115,7 @@ const char *node_type_str(NodeType node_type) {
case NodeTypeLabel:
return "Label";
case NodeTypeGoto:
return "Label";
return "Goto";
case NodeTypeAsmExpr:
return "AsmExpr";
case NodeTypeFieldAccessExpr:
@@ -1448,24 +1460,60 @@ static AstNode *ast_parse_block_expr(ParseContext *pc, int *token_index, bool ma
return nullptr;
}
static BinOpType tok_to_ass_op(Token *token) {
switch (token->id) {
case TokenIdEq: return BinOpTypeAssign;
case TokenIdTimesEq: return BinOpTypeAssignTimes;
case TokenIdDivEq: return BinOpTypeAssignDiv;
case TokenIdModEq: return BinOpTypeAssignMod;
case TokenIdPlusEq: return BinOpTypeAssignPlus;
case TokenIdMinusEq: return BinOpTypeAssignMinus;
case TokenIdBitShiftLeftEq: return BinOpTypeAssignBitShiftLeft;
case TokenIdBitShiftRightEq: return BinOpTypeAssignBitShiftRight;
case TokenIdBitAndEq: return BinOpTypeAssignBitAnd;
case TokenIdBitXorEq: return BinOpTypeAssignBitXor;
case TokenIdBitOrEq: return BinOpTypeAssignBitOr;
case TokenIdBoolAndEq: return BinOpTypeAssignBoolAnd;
case TokenIdBoolOrEq: return BinOpTypeAssignBoolOr;
default: return BinOpTypeInvalid;
}
}
/*
AssignmentExpression : BoolOrExpression token(Equal) BoolOrExpression | BoolOrExpression
AssignmentOperator : token(Eq) | token(TimesEq) | token(DivEq) | token(ModEq) | token(PlusEq) | token(MinusEq) | token(BitShiftLeftEq) | token(BitShiftRightEq) | token(BitAndEq) | token(BitXorEq) | token(BitOrEq) | token(BoolAndEq) | token(BoolOrEq)
*/
static BinOpType ast_parse_ass_op(ParseContext *pc, int *token_index, bool mandatory) {
Token *token = &pc->tokens->at(*token_index);
BinOpType result = tok_to_ass_op(token);
if (result == BinOpTypeInvalid) {
if (mandatory) {
ast_invalid_token_error(pc, token);
} else {
return BinOpTypeInvalid;
}
}
*token_index += 1;
return result;
}
/*
AssignmentExpression : BoolOrExpression AssignmentOperator BoolOrExpression | BoolOrExpression
*/
static AstNode *ast_parse_ass_expr(ParseContext *pc, int *token_index, bool mandatory) {
AstNode *lhs = ast_parse_bool_or_expr(pc, token_index, mandatory);
if (!lhs)
return lhs;
return nullptr;
Token *token = &pc->tokens->at(*token_index);
if (token->id != TokenIdEq)
BinOpType ass_op = ast_parse_ass_op(pc, token_index, false);
if (ass_op == BinOpTypeInvalid)
return lhs;
*token_index += 1;
AstNode *rhs = ast_parse_bool_or_expr(pc, token_index, true);
AstNode *node = ast_create_node(pc, NodeTypeBinOpExpr, token);
node->data.bin_op_expr.op1 = lhs;
node->data.bin_op_expr.bin_op = BinOpTypeAssign;
node->data.bin_op_expr.bin_op = ass_op;
node->data.bin_op_expr.op2 = rhs;
return node;