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Added parser for switch statements , modified grammar #4

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Added parser for switch statements , modified grammar #4

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4 changes: 4 additions & 0 deletions compiler.l
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Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,10 @@ digit [0-9]
"/" {return *yytext;}
"print" {return PRINT;}
"else" {return ELSE;}
"switch" {return SWITCH;}
"case" {return CASE;}
"default" {return DEFAULT;}
"break" {return BREAK;}
"if" {return IF;}
{digit}+ {return DIGIT;}
{alpha}({alpha}|{digit})* {return ID;}
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15 changes: 12 additions & 3 deletions compiler.y
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Expand Up @@ -4,7 +4,7 @@
int yyerror();
%}

%token DIGIT PRINT ID IF
%token DIGIT PRINT ID IF CASE BREAK SWITCH DEFAULT
%token ELSE


Expand All @@ -30,13 +30,22 @@ stmt:
|PRINT '(' expr ')' stmt
|PRINT '(' ID ')'
|IF '(' COND ')' '{' stmt '}' el
| SWITCH '(' ID ')' '{' Case '}' stmt
|assignment stmt
;

el:
stmt
|ELSE '{' stmt '}' stmt ;

Case :
| CASE ':' var stmt BREAK ';' Case
| default
;

default:
DEFAULT ':' stmt BREAK ';' ;

COND: DIGIT
| var '<' var
| var '>' var
Expand All @@ -50,10 +59,10 @@ expr: expr '+' expr
| expr '-' expr
| expr '*' expr
| '(' expr ')'
| DIGIT
| var
;

assignment:ID '=' DIGIT
assignment:ID '=' expr
;


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