213 lines
6.0 KiB
Plaintext
213 lines
6.0 KiB
Plaintext
%{
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#define YYDEBUG 1
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#include <stdio.h>
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#include <math.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "expr.h"
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/*
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YYSTYPE is the lexical value returned by each rule in a bison grammar.
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By default, it is an integer. In this example, we are returning a pointer to an expression.
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*/
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#define YYSTYPE struct expr *
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/*
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Clunky: Manually declare the interface to the scanner generated by flex.
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*/
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extern char *yytext;
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extern int yylex();
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extern int yylineno;
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void yyerror(const char*);
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/*
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Clunky: Keep the final result of the parse in a global variable,
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so that it can be retrieved by main().
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*/
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struct expr * parser_result = 0;
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%}
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%debug
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%define parse.error detailed
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%token TOKEN_EOF
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%token TOKEN_KEYWORD_IDENTIFICATION
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%token TOKEN_KEYWORD_DIVISION
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%token TOKEN_KEYWORD_DATA
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%token TOKEN_KEYWORD_SECTION
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%token TOKEN_PROGRAM_ID
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%token TOKEN_WORKING_STORAGE
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%token TOKEN_PROCEDURE
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%token TOKEN_STOP
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%token TOKEN_RUN
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%token TOKEN_MOVE
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%token TOKEN_KEYWORD_TO
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%token TOKEN_PERFORM
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%token TOKEN_VARYING
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%token TOKEN_KEYWORD_FROM
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%token TOKEN_KEYWORD_BY
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%token TOKEN_UNTIL
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%token TOKEN_END_PERFORM
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%token TOKEN_IF
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%token TOKEN_ELSE_IF
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%token TOKEN_ELSE
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%token TOKEN_END_IF
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%token TOKEN_SPACE
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%token TOKEN_KEYWORD_OCCURS
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%token TOKEN_KEYWORD_VALUE
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%token TOKEN_KEYWORD_COMPUTE
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%token TOKEN_KEYWORD_FUNCTION
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%token TOKEN_IDENT
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%token TOKEN_STRING
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%token TOKEN_INTEGER
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%token TOKEN_PICTURE
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%token TOKEN_ALPHANUMERIC
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%token TOKEN_NUMERIC
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%token TOKEN_SIGNED_NUMERIC
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%token TOKEN_IMPLIED_DECIMAL
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%token TOKEN_COMPUTATION_LEVEL_0
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%token TOKEN_COMPUTATION_LEVEL_1
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%token TOKEN_COMPUTATION_LEVEL_2
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%token TOKEN_COMPUTATION_LEVEL_3
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%token TOKEN_LEFT_PARENTHESIS
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%token TOKEN_RIGHT_PARENTHESIS
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%token TOKEN_DOT
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%token TOKEN_ADD
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%token TOKEN_SUB
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%token TOKEN_MULTIPLY
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%token TOKEN_DIVIDE
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%token TOKEN_EQUAL
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%token TOKEN_GREATER_THAN
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%token TOKEN_LESS_THAN
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%token TOKEN_EXPONENTIAL
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%token TOKEN_DISPLAY
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%%
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file : statements
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statements : statement_list
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;
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statement_list : statement_list statement
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| statement
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;
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statement : section
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| sect_data
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| simple_stmt
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| data_space
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| data_declaration
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;
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section : type TOKEN_KEYWORD_DIVISION TOKEN_DOT
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| type TOKEN_RUN TOKEN_DOT
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;
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sect_data : TOKEN_PROGRAM_ID TOKEN_DOT TOKEN_IDENT TOKEN_DOT
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;
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type : TOKEN_KEYWORD_IDENTIFICATION
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| TOKEN_PROCEDURE
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| TOKEN_STOP
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| TOKEN_KEYWORD_DATA
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;
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simple_stmt : cbl_func_stmt
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| if_branch
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| perform_stmt
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;
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cbl_func_stmt : cbl_function
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| cbl_function op_parms
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| cbl_function assignment_stmt
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| cbl_function op_parms assignment_stmt
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;
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assignment_stmt : TOKEN_EQUAL ext_function
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| TOKEN_EQUAL function
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| TOKEN_KEYWORD_TO op_parms
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;
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op_parms : mathmaticalexpr
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| booleanexpr
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| otherexpr
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| type_expr
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;
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mathmaticalexpr : type_expr TOKEN_ADD type_expr
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| type_expr TOKEN_SUB type_expr
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| type_expr TOKEN_MULTIPLY type_expr
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| type_expr TOKEN_DIVIDE type_expr
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| type_expr TOKEN_EXPONENTIAL type_expr
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| TOKEN_SUB type_expr
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;
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booleanexpr : op_parms TOKEN_LESS_THAN op_parms
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| op_parms TOKEN_GREATER_THAN op_parms
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| op_parms TOKEN_EQUAL op_parms
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;
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otherexpr : TOKEN_LEFT_PARENTHESIS op_parms TOKEN_RIGHT_PARENTHESIS
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| op_parms op_parms
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;
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type_expr : TOKEN_IDENT
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| TOKEN_INTEGER
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| TOKEN_STRING
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| TOKEN_SPACE
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;
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function : op_parms
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;
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ext_function : TOKEN_KEYWORD_FUNCTION TOKEN_IDENT TOKEN_LEFT_PARENTHESIS TOKEN_IDENT TOKEN_RIGHT_PARENTHESIS
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;
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cbl_function : TOKEN_DISPLAY
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| TOKEN_MOVE
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| TOKEN_KEYWORD_COMPUTE
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| TOKEN_PERFORM
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;
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if_branch : TOKEN_IF op_parms
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| TOKEN_ELSE_IF op_parms
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| TOKEN_ELSE statement
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| TOKEN_END_IF
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;
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perform_stmt : TOKEN_PERFORM TOKEN_VARYING TOKEN_IDENT TOKEN_KEYWORD_FROM TOKEN_INTEGER TOKEN_KEYWORD_BY TOKEN_INTEGER TOKEN_UNTIL op_parms
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| TOKEN_END_PERFORM
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;
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data_space : TOKEN_WORKING_STORAGE
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| TOKEN_KEYWORD_SECTION
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| TOKEN_DOT
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;
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data_category : TOKEN_ALPHANUMERIC
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| TOKEN_NUMERIC
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| TOKEN_SIGNED_NUMERIC
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| TOKEN_IMPLIED_DECIMAL
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;
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categry_contain : TOKEN_LEFT_PARENTHESIS TOKEN_INTEGER TOKEN_RIGHT_PARENTHESIS
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| TOKEN_LEFT_PARENTHESIS TOKEN_IDENT TOKEN_RIGHT_PARENTHESIS
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;
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complete_category: data_category categry_contain
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| data_category categry_contain complete_category
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;
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data_clause : TOKEN_COMPUTATION_LEVEL_0
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| TOKEN_COMPUTATION_LEVEL_1
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| TOKEN_COMPUTATION_LEVEL_2
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| TOKEN_COMPUTATION_LEVEL_3
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| TOKEN_KEYWORD_VALUE
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| TOKEN_KEYWORD_OCCURS
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;
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full_data_clause: data_clause data_clause
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| data_clause
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;
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simple_decl : TOKEN_INTEGER TOKEN_IDENT TOKEN_DOT
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;
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complex_decl : TOKEN_INTEGER TOKEN_IDENT TOKEN_PICTURE category_spec TOKEN_DOT
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;
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category_spec : complete_category
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| complete_category data_clauses
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;
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data_clauses : full_data_clause
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| full_data_clause TOKEN_INTEGER
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;
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data_declaration: simple_decl
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| complex_decl
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;
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%%
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void yyerror(const char* msg) {
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fprintf(stderr, "Error | Line: %d\n%s\n",yylineno,msg);
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}
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