117 lines
2.7 KiB
Plaintext
117 lines
2.7 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 stmt *
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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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// void yyerror(struct stmt *parser_result, const char*);
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void yyerror(const char*);
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extern int yylineno;
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struct stmt *parser_result = 0;
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%}
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// %parse-param {struct stmt *parser_result}
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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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{parser_result = $1; return 0;}
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;
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statements : statements statement
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{ $$ = $1; $1->next = $2; }
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| statement
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{ $$ = $1; }
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;
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statement : simple_stmt
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{$$ = stmt_create(STMT_BLOCK, NULL, NULL, NULL, NULL, $1, NULL, NULL);}
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;
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simple_stmt : cbl_func_stmt
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{$$ = $1;}
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;
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cbl_func_stmt : display_stmt
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{$$ = $1;}
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;
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display_stmt : TOKEN_DISPLAY expr
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{$$ = stmt_create(STMT_PRINT, NULL, NULL, $2, NULL, NULL, NULL, NULL);}
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;
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expr : TOKEN_STRING
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{ $$ = expr_create_string_literal(yytext);}
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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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} |