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examples: bistro: don't be lazy with switch

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* examples/c/bistromathic/parse.y (yylex): Use the switch to
discriminate all the cases.
This commit is contained in:
Akim Demaille
2020-04-14 07:59:51 +02:00
parent 758172a8b9
commit fc18b4313a
1 changed files with 36 additions and 30 deletions
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66
examples/c/bistromathic/parse.y
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@@ -235,43 +235,49 @@ yylex (const char **line, YYSTYPE *yylval, YYLTYPE *yylloc)
case '(': return TOK_LPAREN;
case ')': return TOK_RPAREN;
case 0: return TOK_YYEOF;
case '\0': return TOK_YYEOF;
default:
// Numbers.
if (c == '.' || isdigit (c))
{
int nchars = 0;
sscanf (*line - 1, "%lf%n", &yylval->TOK_NUM, &nchars);
case '.':
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
{
int nchars = 0;
sscanf (*line - 1, "%lf%n", &yylval->TOK_NUM, &nchars);
*line += nchars - 1;
yylloc->last_column += nchars - 1;
return TOK_NUM;
}
}
// Identifiers.
else if (islower (c))
{
int nchars = 0;
char buf[100];
sscanf (*line - 1, "%99[a-z]%n", buf, &nchars);
*line += nchars - 1;
yylloc->last_column += nchars - 1;
if (strcmp (buf, "exit") == 0)
return TOK_EXIT;
else
{
symrec *s = getsym (buf);
if (!s)
s = putsym (buf, TOK_VAR);
yylval->TOK_VAR = s;
return s->type;
}
}
case 'a': case 'b': case 'c': case 'd': case 'e':
case 'f': case 'g': case 'h': case 'i': case 'j':
case 'k': case 'l': case 'm': case 'n': case 'o':
case 'p': case 'q': case 'r': case 's': case 't':
case 'u': case 'v': case 'w': case 'x': case 'y':
case 'z':
{
int nchars = 0;
char buf[100];
sscanf (*line - 1, "%99[a-z]%n", buf, &nchars);
*line += nchars - 1;
yylloc->last_column += nchars - 1;
if (strcmp (buf, "exit") == 0)
return TOK_EXIT;
else
{
symrec *s = getsym (buf);
if (!s)
s = putsym (buf, TOK_VAR);
yylval->TOK_VAR = s;
return s->type;
}
}
// Stray characters.
else
{
yyerror (yylloc, "error: invalid character");
return yylex (line, yylval, yylloc);
}
default:
yyerror (yylloc, "error: invalid character");
return yylex (line, yylval, yylloc);
}
}