add hg and python

1 files changed, 66 insertions, 0 deletions

diff --git a/sys/src/cmd/python/Parser/listnode.c b/sys/src/cmd/python/Parser/listnode.c
new file mode 100644
index 000000000..c0b3b666f
--- /dev/null
+++ b/sys/src/cmd/python/Parser/listnode.c
@@ -0,0 +1,66 @@
+
+/* List a node on a file */
+
+#include "pgenheaders.h"
+#include "token.h"
+#include "node.h"
+
+/* Forward */
+static void list1node(FILE *, node *);
+static void listnode(FILE *, node *);
+
+void
+PyNode_ListTree(node *n)
+{
+	listnode(stdout, n);
+}
+
+static int level, atbol;
+
+static void
+listnode(FILE *fp, node *n)
+{
+	level = 0;
+	atbol = 1;
+	list1node(fp, n);
+}
+
+static void
+list1node(FILE *fp, node *n)
+{
+	if (n == 0)
+		return;
+	if (ISNONTERMINAL(TYPE(n))) {
+		int i;
+		for (i = 0; i < NCH(n); i++)
+			list1node(fp, CHILD(n, i));
+	}
+	else if (ISTERMINAL(TYPE(n))) {
+		switch (TYPE(n)) {
+		case INDENT:
+			++level;
+			break;
+		case DEDENT:
+			--level;
+			break;
+		default:
+			if (atbol) {
+				int i;
+				for (i = 0; i < level; ++i)
+					fprintf(fp, "\t");
+				atbol = 0;
+			}
+			if (TYPE(n) == NEWLINE) {
+				if (STR(n) != NULL)
+					fprintf(fp, "%s", STR(n));
+				fprintf(fp, "\n");
+				atbol = 1;
+			}
+			else
+				fprintf(fp, "%s ", STR(n));
+			break;
+		}
+	}
+	else
+		fprintf(fp, "? ");
+}