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cobol-interpreter-lab
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get shift/reduce conflicts down by one

This commit is contained in:
vel 2024-11-13 18:14:31 -08:00
parent 8aae70da64
commit 75e28de83c
Signed by: velvox
GPG Key ID: 59D9762F674151DF
1 changed files with 15 additions and 10 deletions
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25
lab-4/parser.bison
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@ -61,6 +61,9 @@ int yylex();
%token TOKEN_WORKING_STORAGE
%token TOKEN_EOF
%left TOKEN_ADD TOKEN_SUB
%left TOKEN_MULTIPLY TOKEN_DIVIDE
%right TOKEN_EXPONENTIAL
%%
@ -96,18 +99,17 @@ cbl_func_stmt : display_stmt
| move_stmt
| compute_stmt
;
display_stmt : TOKEN_DISPLAY op_parms_list
;
move_stmt : TOKEN_MOVE op_parms_list assignment_stmt
;
compute_stmt : TOKEN_KEYWORD_COMPUTE single_op_parm assignment_stmt
compute_stmt : TOKEN_KEYWORD_COMPUTE op_parms_list assignment_stmt
;
assignment_stmt : TOKEN_EQUAL ext_function
| TOKEN_EQUAL op_parms_list
| TOKEN_KEYWORD_TO op_parms_list
;
op_parms_list : single_op_parm
op_parms_list : op_parm
| op_parms_list op_parm
;
op_parm : mathmaticalexpr
@ -116,18 +118,24 @@ op_parm : mathmaticalexpr
;
term : mathmaticalexpr
;
math_op : TOKEN_ADD
| TOKEN_SUB
| TOKEN_MULTIPLY
| TOKEN_DIVIDE
| TOKEN_EXPONENTIAL
;
mathmaticalexpr : type_expr
mathmaticalexpr : primary_expr
| mathmaticalexpr math_op term
| container_expr
| type_expr container_expr
;
container_expr : TOKEN_LEFT_PARENTHESIS op_parms_list TOKEN_RIGHT_PARENTHESIS
full_contain : simple_contain
| TOKEN_IDENT simple_contain
;
simple_contain : TOKEN_LEFT_PARENTHESIS mathmaticalexpr TOKEN_RIGHT_PARENTHESIS
;
primary_expr : type_expr
| full_contain
| TOKEN_SUB primary_expr
;
booleanexpr : mathmaticalexpr TOKEN_LESS_THAN term
| mathmaticalexpr TOKEN_GREATER_THAN term
@ -137,7 +145,6 @@ type_expr : TOKEN_IDENT
| TOKEN_INTEGER
| TOKEN_STRING
| TOKEN_SPACE
| TOKEN_SUB TOKEN_IDENT
;
ext_function : TOKEN_KEYWORD_FUNCTION TOKEN_IDENT TOKEN_LEFT_PARENTHESIS TOKEN_IDENT TOKEN_RIGHT_PARENTHESIS
;
@ -186,8 +193,6 @@ data_clauses : full_data_clause
data_declaration: simple_decl
| complex_decl
;
single_op_parm : op_parm
;
%%
void yyerror(const char* msg) {