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This commit is contained in:
Dianne Skoll
2024-06-01 14:00:39 -04:00
parent e9e4db94bd
commit 29b87898aa
1 changed files with 34 additions and 1 deletions
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35
src/expr.c
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@@ -48,7 +48,7 @@
expr_nodes contain the following data, depending on their type:
1) N_CONSTANT: The constant value is stored in the node's u.value field
2) N_LOCAL_VAR: The offset into the functions argument list is stored in
2) N_LOCAL_VAR: The offset into the function's argument list is stored in
u.arg
3) N_VARIABLE: The variable's name is stored in u.value.v.str
4) N_SYSVAR: The system variable's name is stored in u.value.v.str
@@ -60,6 +60,31 @@
8) N_SHORT_VAR: The variable's name is stored in u.name
9) N_SHORT_SYSVAR: The system variable's name is stored in u.name
10) N_SHORT_USER_FUNC: The function's name is stored in u.name
Nodes may have an arbitrary number of children, represented in the standard
two-pointer left-child, right-sibling representation.
As an example, the expression: 3 + 5 * min(x, 4) is represented like this:
+----------+
| OPERATOR |
| + |
+----------+
/ \
+----------+ +----------+
| CONSTANT | | OPERATOR |
| 3 | | * |
+----------+ +----------+
/ \
+----------+ +---------+
| CONSTANT | | BUILTIN |
| 5 | | min |
+----------+ +---------+
/ \
+----------+ +----------+
| VARIABLE | | CONSTANT |
| x | | 4 |
+----------+ +----------+
*/
/* Constants for the "how" arg to compare() */
@@ -142,6 +167,14 @@ alloc_expr_node(int *r)
return node;
}
/***************************************************************/
/* */
/* add_child - add a new child to an existing node */
/* */
/* adds "child" as the rightmost child of "parent". Always */
/* succeeds, so returns no value. */
/* */
/***************************************************************/
static void
add_child(expr_node *parent, expr_node *child)
{