add hg and python

1 files changed, 173 insertions, 0 deletions

diff --git a/sys/src/cmd/python/Parser/pgenmain.c b/sys/src/cmd/python/Parser/pgenmain.c
new file mode 100644
index 000000000..fc27a2cd1
--- /dev/null
+++ b/sys/src/cmd/python/Parser/pgenmain.c
@@ -0,0 +1,173 @@
+
+/* Parser generator main program */
+
+/* This expects a filename containing the grammar as argv[1] (UNIX)
+   or asks the console for such a file name (THINK C).
+   It writes its output on two files in the current directory:
+   - "graminit.c" gets the grammar as a bunch of initialized data
+   - "graminit.h" gets the grammar's non-terminals as #defines.
+   Error messages and status info during the generation process are
+   written to stdout, or sometimes to stderr. */
+
+/* XXX TO DO:
+   - check for duplicate definitions of names (instead of fatal err)
+*/
+
+#include "Python.h"
+#include "pgenheaders.h"
+#include "grammar.h"
+#include "node.h"
+#include "parsetok.h"
+#include "pgen.h"
+
+int Py_DebugFlag;
+int Py_VerboseFlag;
+int Py_IgnoreEnvironmentFlag;
+
+/* Forward */
+grammar *getgrammar(char *filename);
+
+void
+Py_Exit(int sts)
+{
+	exit(sts);
+}
+
+int
+main(int argc, char **argv)
+{
+	grammar *g;
+	FILE *fp;
+	char *filename, *graminit_h, *graminit_c;
+	
+	if (argc != 4) {
+		fprintf(stderr,
+			"usage: %s grammar graminit.h graminit.c\n", argv[0]);
+		Py_Exit(2);
+	}
+	filename = argv[1];
+	graminit_h = argv[2];
+	graminit_c = argv[3];
+	g = getgrammar(filename);
+	fp = fopen(graminit_c, "w");
+	if (fp == NULL) {
+		perror(graminit_c);
+		Py_Exit(1);
+	}
+	if (Py_DebugFlag)
+		printf("Writing %s ...\n", graminit_c);
+	printgrammar(g, fp);
+	fclose(fp);
+	fp = fopen(graminit_h, "w");
+	if (fp == NULL) {
+		perror(graminit_h);
+		Py_Exit(1);
+	}
+	if (Py_DebugFlag)
+		printf("Writing %s ...\n", graminit_h);
+	printnonterminals(g, fp);
+	fclose(fp);
+	Py_Exit(0);
+	return 0; /* Make gcc -Wall happy */
+}
+
+grammar *
+getgrammar(char *filename)
+{
+	FILE *fp;
+	node *n;
+	grammar *g0, *g;
+	perrdetail err;
+	
+	fp = fopen(filename, "r");
+	if (fp == NULL) {
+		perror(filename);
+		Py_Exit(1);
+	}
+	g0 = meta_grammar();
+	n = PyParser_ParseFile(fp, filename, g0, g0->g_start,
+		      (char *)NULL, (char *)NULL, &err);
+	fclose(fp);
+	if (n == NULL) {
+		fprintf(stderr, "Parsing error %d, line %d.\n",
+			err.error, err.lineno);
+		if (err.text != NULL) {
+			size_t i;
+			fprintf(stderr, "%s", err.text);
+			i = strlen(err.text);
+			if (i == 0 || err.text[i-1] != '\n')
+				fprintf(stderr, "\n");
+			for (i = 0; i < err.offset; i++) {
+				if (err.text[i] == '\t')
+					putc('\t', stderr);
+				else
+					putc(' ', stderr);
+			}
+			fprintf(stderr, "^\n");
+			PyObject_FREE(err.text);
+		}
+		Py_Exit(1);
+	}
+	g = pgen(n);
+	if (g == NULL) {
+		printf("Bad grammar.\n");
+		Py_Exit(1);
+	}
+	return g;
+}
+
+/* Can't happen in pgen */
+PyObject*
+PyErr_Occurred()
+{
+	return 0;
+}
+
+void
+Py_FatalError(const char *msg)
+{
+	fprintf(stderr, "pgen: FATAL ERROR: %s\n", msg);
+	Py_Exit(1);
+}
+
+/* No-nonsense my_readline() for tokenizer.c */
+
+char *
+PyOS_Readline(FILE *sys_stdin, FILE *sys_stdout, char *prompt)
+{
+	size_t n = 1000;
+	char *p = (char *)PyMem_MALLOC(n);
+	char *q;
+	if (p == NULL)
+		return NULL;
+	fprintf(stderr, "%s", prompt);
+	q = fgets(p, n, sys_stdin);
+	if (q == NULL) {
+		*p = '\0';
+		return p;
+	}
+	n = strlen(p);
+	if (n > 0 && p[n-1] != '\n')
+		p[n-1] = '\n';
+	return (char *)PyMem_REALLOC(p, n+1);
+}
+
+/* No-nonsense fgets */
+char *
+Py_UniversalNewlineFgets(char *buf, int n, FILE *stream, PyObject *fobj)
+{
+	return fgets(buf, n, stream);
+}
+
+
+#include <stdarg.h>
+
+void
+PySys_WriteStderr(const char *format, ...)
+{
+	va_list va;
+
+	va_start(va, format);
+	vfprintf(stderr, format, va);
+	va_end(va);
+}