ref: 1f137b8e48ba8345cc7a45494009b1cf69e6a47b
parent: e7314780c63546179a1f0a139b5ca706567b0bf1
author: Tor Andersson <tor.andersson@artifex.com>
date: Thu Jul 31 12:52:26 EDT 2014
Improve MuJS interactive shell. Add read/readline/write/quit functions. Add CommonJS style modules with require function.
--- a/jsstate.c
+++ b/jsstate.c
@@ -115,7 +115,8 @@
js_pushglobal(J);
js_call(J, 0);
if (report)
- printf("%s\n", js_tostring(J, -1));+ if (js_isdefined(J, -1))
+ printf("%s\n", js_tostring(J, -1));js_pop(J, 1);
js_endtry(J);
return 0;
--- a/main.c
+++ b/main.c
@@ -1,4 +1,6 @@
#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
#include "mujs.h"
@@ -30,6 +32,84 @@
js_pushundefined(J);
}
+static void jsB_write(js_State *J)
+{+ unsigned int i, top = js_gettop(J);
+ for (i = 1; i < top; ++i) {+ const char *s = js_tostring(J, i);
+ if (i > 1) putchar(' ');+ fputs(s, stdout);
+ }
+ js_pushundefined(J);
+}
+
+static void jsB_read(js_State *J)
+{+ const char *filename = js_tostring(J, 1);
+ FILE *f;
+ char *s;
+ int n, t;
+
+ f = fopen(filename, "rb");
+ if (!f) {+ js_error(J, "cannot open file: '%s'", filename);
+ }
+
+ if (fseek(f, 0, SEEK_END) < 0) {+ fclose(f);
+ js_error(J, "cannot seek in file: '%s'", filename);
+ }
+ n = ftell(f);
+ fseek(f, 0, SEEK_SET);
+
+ s = malloc(n + 1);
+ if (!s) {+ fclose(f);
+ js_error(J, "cannot allocate storage for file contents: '%s'", filename);
+ }
+
+ t = fread(s, 1, n, f);
+ if (t != n) {+ free(s);
+ fclose(f);
+ js_error(J, "cannot read data from file: '%s'", filename);
+ }
+ s[n] = 0;
+
+ js_pushstring(J, s);
+ free(s);
+ fclose(f);
+}
+
+static void jsB_readline(js_State *J)
+{+ char line[256];
+ int n;
+ if (!fgets(line, sizeof line, stdin))
+ js_error(J, "cannot read line from stdin");
+ n = strlen(line);
+ if (n > 0 && line[n-1] == '\n')
+ line[n-1] = 0;
+ js_pushstring(J, line);
+}
+
+static void jsB_quit(js_State *J)
+{+ exit(js_tonumber(J, 1));
+}
+
+static const char *require_js =
+ "function require(name) {\n"+ "var cache = require.cache;\n"
+ "if (name in cache) return cache[name];\n"
+ "var exports = {};\n"+ "cache[name] = exports;\n"
+ "Function('exports', read(name+'.js'))(exports);\n"+ "return exports;\n"
+ "}\n"
+ "require.cache = Object.create(null);\n"
+;
+
int
main(int argc, char **argv)
{@@ -47,6 +127,20 @@
js_newcfunction(J, jsB_print, 1);
js_setglobal(J, "print");
+
+ js_newcfunction(J, jsB_write, 0);
+ js_setglobal(J, "write");
+
+ js_newcfunction(J, jsB_read, 1);
+ js_setglobal(J, "read");
+
+ js_newcfunction(J, jsB_readline, 0);
+ js_setglobal(J, "readline");
+
+ js_newcfunction(J, jsB_quit, 1);
+ js_setglobal(J, "quit");
+
+ js_dostring(J, require_js, 0);
if (argc > 1) { for (i = 1; i < argc; ++i) {