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[examples] C like expressions comments

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This commit is contained in:
Allen Webster
2021-10-10 16:52:09 -07:00
parent 07770d51d1
commit c968dd4329
2 changed files with 67 additions and 8 deletions
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examples/expr/expr_c_like.c
+12 -7
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@@ -1,7 +1,11 @@
/*
** Example: c like expressions
**
** TODO
** This example has the setup for parsing C expressions with the Metadesk
** expression parser.
**
** In the accompanying expr_c_like.mdesk there are more comments about using
** the expression system from the side of the Metadesk files.
**
*/
@@ -135,23 +139,24 @@ print_expression(FILE *out, MD_Expr *expr)
case MD_ExprOprKind_Prefix:
{
fprintf(out, "%.*s", MD_S8VArg(op->string));
MD_Node *node = expr->md_node;
fprintf(out, "%.*s(", MD_S8VArg(op->string));
print_expression(out, expr->unary_operand);
fprintf(out, ")");
}break;
case MD_ExprOprKind_Postfix:
{
fprintf(out, "(");
print_expression(out, expr->unary_operand);
MD_String8 op_string = op->string;
// TODO(allen): formalize 'set delimiter mask' into the library
MD_u64 set_delimiter_mask = 0x3F;
if ((expr->md_node->flags & set_delimiter_mask) != 0)
if ((expr->md_node->flags & MD_NodeFlag_MaskSetDelimiters) != 0)
{
fprintf(out, "%c...%c", op_string.str[0], op_string.str[1]);
fprintf(out, ")%c...%c", op_string.str[0], op_string.str[1]);
}
else
{
fprintf(out, "%.*s", MD_S8VArg(op_string));
fprintf(out, ")%.*s", MD_S8VArg(op_string));
}
}break;