2 files changed, 623 insertions, 0 deletions

diff --git a/lib/luaexpat/lxplib.c b/lib/luaexpat/lxplib.c
new file mode 100644
index 000000000..e26343ce9
--- /dev/null
+++ b/lib/luaexpat/lxplib.c
@@ -0,0 +1,599 @@
+/*
+** $Id: lxplib.c,v 1.16 2007/06/05 20:03:12 carregal Exp $
+** LuaExpat: Lua bind for Expat library
+** See Copyright Notice in license.html
+*/
+
+
+#include <assert.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "expat.h"
+
+#include "lua.h"
+#include "lauxlib.h"
+
+
+#include "lxplib.h"
+
+
+#if !defined(lua_pushliteral)
+#define lua_pushliteral(L, s)	\
+	lua_pushstring(L, "" s, (sizeof(s)/sizeof(char))-1)
+#endif
+
+
+enum XPState {
+  XPSpre,  /* parser just initialized */
+  XPSok,   /* state while parsing */
+  XPSfinished,  /* state after finished parsing */
+  XPSerror,
+  XPSstring  /* state while reading a string */
+};
+
+struct lxp_userdata {
+  lua_State *L;
+  XML_Parser parser;  /* associated expat parser */
+  int tableref;  /* table with callbacks for this parser */
+  enum XPState state;
+  luaL_Buffer *b;  /* to concatenate sequences of cdata pieces */
+};
+
+typedef struct lxp_userdata lxp_userdata;
+
+
+static int reporterror (lxp_userdata *xpu) {
+  lua_State *L = xpu->L;
+  XML_Parser p = xpu->parser;
+  lua_pushnil(L);
+  lua_pushstring(L, XML_ErrorString(XML_GetErrorCode(p)));
+  lua_pushnumber(L, XML_GetCurrentLineNumber(p));
+  lua_pushnumber(L, XML_GetCurrentColumnNumber(p) + 1);
+  lua_pushnumber(L, XML_GetCurrentByteIndex(p) + 1);
+  return 5;
+}
+
+
+static lxp_userdata *createlxp (lua_State *L) {
+  lxp_userdata *xpu = (lxp_userdata *)lua_newuserdata(L, sizeof(lxp_userdata));
+  xpu->tableref = LUA_REFNIL;  /* in case of errors... */
+  xpu->parser = NULL;
+  xpu->L = NULL;
+  xpu->state = XPSpre;
+  luaL_getmetatable(L, ParserType);
+  lua_setmetatable(L, -2);
+  return xpu;
+}
+
+
+static void lxpclose (lua_State *L, lxp_userdata *xpu) {
+  luaL_unref(L, LUA_REGISTRYINDEX, xpu->tableref);
+  xpu->tableref = LUA_REFNIL;
+  if (xpu->parser)
+    XML_ParserFree(xpu->parser);
+  xpu->parser = NULL;
+}
+
+
+
+
+/*
+** Auxiliary function to call a Lua handle
+*/
+static void docall (lxp_userdata *xpu, int nargs, int nres) {
+  lua_State *L = xpu->L;
+  assert(xpu->state == XPSok);
+  if (lua_pcall(L, nargs + 1, nres, 0) != 0) {
+    xpu->state = XPSerror;
+    luaL_unref(L, LUA_REGISTRYINDEX, xpu->tableref);
+    xpu->tableref = luaL_ref(L, LUA_REGISTRYINDEX);  /* error message */
+  }
+}
+
+
+/*
+** Check whether there is pending Cdata, and call its handle if necessary
+*/
+static void dischargestring (lxp_userdata *xpu) {
+  assert(xpu->state == XPSstring);
+  xpu->state = XPSok;
+  luaL_pushresult(xpu->b);
+  docall(xpu, 1, 0);
+}
+
+
+/*
+** Check whether there is a Lua handle for a given event: If so,
+** put it on the stack (to be called later), and also push `self'
+*/
+static int getHandle (lxp_userdata *xpu, const char *handle) {
+  lua_State *L = xpu->L;
+  if (xpu->state == XPSstring) dischargestring(xpu);
+  if (xpu->state == XPSerror)
+    return 0;  /* some error happened before; skip all handles */
+  lua_pushstring(L, handle);
+  lua_gettable(L, 3);
+  if (lua_toboolean(L, -1) == 0) {
+    lua_pop(L, 1);
+    return 0;
+  }
+  if (!lua_isfunction(L, -1)) {
+    luaL_error(L, "lxp `%s' callback is not a function", handle);
+  }
+  lua_pushvalue(L, 1);  /* first argument in every call (self) */
+  return 1;
+}
+
+
+
+/*
+** {======================================================
+** Handles
+** =======================================================
+*/
+
+
+static void f_StartCdata (void *ud) {
+  lxp_userdata *xpu = (lxp_userdata *)ud;
+  if (getHandle(xpu, StartCdataKey) == 0) return;  /* no handle */
+  docall(xpu, 0, 0);
+}
+
+
+static void f_EndCdataKey (void *ud) {
+  lxp_userdata *xpu = (lxp_userdata *)ud;
+  if (getHandle(xpu, EndCdataKey) == 0) return;  /* no handle */
+  docall(xpu, 0, 0);
+}
+
+
+static void f_CharData (void *ud, const char *s, int len) {
+  lxp_userdata *xpu = (lxp_userdata *)ud;
+  if (xpu->state == XPSok) {
+    if (getHandle(xpu, CharDataKey) == 0) return;  /* no handle */
+    xpu->state = XPSstring;
+    luaL_buffinit(xpu->L, xpu->b);
+  }
+  if (xpu->state == XPSstring)
+    luaL_addlstring(xpu->b, s, len);
+}
+
+
+static void f_Comment (void *ud, const char *data) {
+  lxp_userdata *xpu = (lxp_userdata *)ud;
+  if (getHandle(xpu, CommentKey) == 0) return;  /* no handle */
+  lua_pushstring(xpu->L, data);
+  docall(xpu, 1, 0);
+}
+
+
+static void f_Default (void *ud, const char *data, int len) {
+  lxp_userdata *xpu = (lxp_userdata *)ud;
+  if (getHandle(xpu, DefaultKey) == 0) return;  /* no handle */
+  lua_pushlstring(xpu->L, data, len);
+  docall(xpu, 1, 0);
+}
+
+
+static void f_DefaultExpand (void *ud, const char *data, int len) {
+  lxp_userdata *xpu = (lxp_userdata *)ud;
+  if (getHandle(xpu, DefaultExpandKey) == 0) return;  /* no handle */
+  lua_pushlstring(xpu->L, data, len);
+  docall(xpu, 1, 0);
+}
+
+
+static void f_StartElement (void *ud, const char *name, const char **attrs) {
+  lxp_userdata *xpu = (lxp_userdata *)ud;
+  lua_State *L = xpu->L;
+  int lastspec = XML_GetSpecifiedAttributeCount(xpu->parser) / 2;
+  int i = 1;
+  if (getHandle(xpu, StartElementKey) == 0) return;  /* no handle */
+  lua_pushstring(L, name);
+  lua_newtable(L);
+  while (*attrs) {
+    if (i <= lastspec) {
+      lua_pushnumber(L, i++);
+      lua_pushstring(L, *attrs);
+      lua_settable(L, -3);
+    }
+    lua_pushstring(L, *attrs++);
+    lua_pushstring(L, *attrs++);
+    lua_settable(L, -3);
+  }
+  docall(xpu, 2, 0);  /* call function with self, name, and attributes */
+}
+
+
+static void f_EndElement (void *ud, const char *name) {
+  lxp_userdata *xpu = (lxp_userdata *)ud;
+  if (getHandle(xpu, EndElementKey) == 0) return;  /* no handle */
+  lua_pushstring(xpu->L, name);
+  docall(xpu, 1, 0);
+}
+
+
+static int f_ExternaEntity (XML_Parser p, const char *context,
+                                          const char *base,
+                                          const char *systemId,
+                                          const char *publicId) {
+  lxp_userdata *xpu = (lxp_userdata *)XML_GetUserData(p);
+  lua_State *L = xpu->L;
+  lxp_userdata *child;
+  int status;
+  if (getHandle(xpu, ExternalEntityKey) == 0) return 1;  /* no handle */
+  child = createlxp(L);
+  child->parser = XML_ExternalEntityParserCreate(p, context, NULL);
+  if (!child->parser)
+    luaL_error(L, "XML_ParserCreate failed");
+  lua_rawgeti(L, LUA_REGISTRYINDEX, xpu->tableref); /*lua_getref(L, xpu->tableref); */ /* child uses the same table of its father */
+  child->tableref = luaL_ref(L, LUA_REGISTRYINDEX);
+  lua_pushstring(L, base);
+  lua_pushstring(L, systemId);
+  lua_pushstring(L, publicId);
+  docall(xpu, 4, 1);
+  status = lua_toboolean(L, -1);
+  lua_pop(L, 1);
+  lxpclose(L, child);
+  return status;
+}
+
+
+static void f_StartNamespaceDecl (void *ud, const char *prefix,
+                                            const char *uri) {
+  lxp_userdata *xpu = (lxp_userdata *)ud;
+  lua_State *L = xpu->L;
+  if (getHandle(xpu, StartNamespaceDeclKey) == 0) return;  /* no handle */
+  lua_pushstring(L, prefix);
+  lua_pushstring(L, uri);
+  docall(xpu, 2, 0);
+}
+
+
+static void f_EndNamespaceDecl (void *ud, const char *prefix) {
+  lxp_userdata *xpu = (lxp_userdata *)ud;
+  if (getHandle(xpu, EndNamespaceDeclKey) == 0) return;  /* no handle */
+  lua_pushstring(xpu->L, prefix);
+  docall(xpu, 1, 0);
+}
+
+
+static void f_NotationDecl (void *ud, const char *notationName,
+                                      const char *base,
+                                      const char *systemId,
+                                      const char *publicId) {
+  lxp_userdata *xpu = (lxp_userdata *)ud;
+  lua_State *L = xpu->L;
+  if (getHandle(xpu, NotationDeclKey) == 0) return;  /* no handle */
+  lua_pushstring(L, notationName);
+  lua_pushstring(L, base);
+  lua_pushstring(L, systemId);
+  lua_pushstring(L, publicId);
+  docall(xpu, 4, 0);
+}
+
+
+static int f_NotStandalone (void *ud) {
+  int status;
+  lxp_userdata *xpu = (lxp_userdata *)ud;
+  lua_State *L = xpu->L;
+  if (getHandle(xpu, NotStandaloneKey) == 0) return 1;  /* no handle */
+  docall(xpu, 0, 1);
+  status = lua_toboolean(L, -1);
+  lua_pop(L, 1);
+  return status;
+}
+
+
+static void f_ProcessingInstruction (void *ud, const char *target,
+                                               const char *data) {
+  lxp_userdata *xpu = (lxp_userdata *)ud;
+  lua_State *L = xpu->L;
+  if (getHandle(xpu, ProcessingInstructionKey) == 0) return;  /* no handle */
+  lua_pushstring(L, target);
+  lua_pushstring(L, data);
+  docall(xpu, 2, 0);
+}
+
+
+static void f_UnparsedEntityDecl (void *ud, const char *entityName,
+                                            const char *base,
+                                            const char *systemId,
+                                            const char *publicId,
+                                            const char *notationName) {
+  lxp_userdata *xpu = (lxp_userdata *)ud;
+  lua_State *L = xpu->L;
+  if (getHandle(xpu, UnparsedEntityDeclKey) == 0) return;  /* no handle */
+  lua_pushstring(L, entityName);
+  lua_pushstring(L, base);
+  lua_pushstring(L, systemId);
+  lua_pushstring(L, publicId);
+  lua_pushstring(L, notationName);
+  docall(xpu, 5, 0);
+}
+
+static void f_StartDoctypeDecl (void *ud, const XML_Char *doctypeName,
+                                          const XML_Char *sysid,
+                                          const XML_Char *pubid,
+                                          int has_internal_subset) {
+  lxp_userdata *xpu = (lxp_userdata *)ud;
+  if (getHandle(xpu, StartDoctypeDeclKey) == 0) return;  /* no handle */
+  lua_pushstring(xpu->L, doctypeName);
+  lua_pushstring(xpu->L, sysid);
+  lua_pushstring(xpu->L, pubid);
+  lua_pushboolean(xpu->L, has_internal_subset);
+  docall(xpu, 4, 0);
+}
+
+/* }====================================================== */
+
+
+
+static int hasfield (lua_State *L, const char *fname) {
+  int res;
+  lua_pushstring(L, fname);
+  lua_gettable(L, 1);
+  res = !lua_isnil(L, -1);
+  lua_pop(L, 1);
+  return res;
+}
+
+
+static void checkcallbacks (lua_State *L) {
+  static const char *const validkeys[] = {
+    "StartCdataSection", "EndCdataSection", "CharacterData", "Comment",
+    "Default", "DefaultExpand", "StartElement", "EndElement",
+    "ExternalEntityRef", "StartNamespaceDecl", "EndNamespaceDecl",
+    "NotationDecl", "NotStandalone", "ProcessingInstruction",
+    "UnparsedEntityDecl", "StartDoctypeDecl", NULL};
+  if (hasfield(L, "_nonstrict")) return;
+  lua_pushnil(L);
+  while (lua_next(L, 1)) {
+    lua_pop(L, 1);  /* remove value */
+#if ! defined (LUA_VERSION_NUM) || LUA_VERSION_NUM < 501
+    if (lua_type(L, -1) != LUA_TSTRING ||
+        luaL_findstring(lua_tostring(L, -1), validkeys) < 0)
+      luaL_error(L, "invalid key `%s' in callback table", lua_tostring(L, -1));
+#else
+    luaL_checkoption(L, -1, NULL, validkeys);
+#endif
+  }
+}
+
+
+static int lxp_make_parser (lua_State *L) {
+  XML_Parser p;
+  char sep = *luaL_optstring(L, 2, "");
+  lxp_userdata *xpu = createlxp(L);
+  p = xpu->parser = (sep == '\0') ? XML_ParserCreate(NULL) :
+                                    XML_ParserCreateNS(NULL, sep);
+  if (!p)
+    luaL_error(L, "XML_ParserCreate failed");
+  luaL_checktype(L, 1, LUA_TTABLE);
+  checkcallbacks(L);
+  lua_pushvalue(L, 1);
+  xpu->tableref = luaL_ref(L, LUA_REGISTRYINDEX);
+  XML_SetUserData(p, xpu);
+  if (hasfield(L, StartCdataKey) || hasfield(L, EndCdataKey))
+    XML_SetCdataSectionHandler(p, f_StartCdata, f_EndCdataKey);
+  if (hasfield(L, CharDataKey))
+    XML_SetCharacterDataHandler(p, f_CharData);
+  if (hasfield(L, CommentKey))
+    XML_SetCommentHandler(p, f_Comment);
+  if (hasfield(L, DefaultKey))
+    XML_SetDefaultHandler(p, f_Default);
+  if (hasfield(L, DefaultExpandKey))
+    XML_SetDefaultHandlerExpand(p, f_DefaultExpand);
+  if (hasfield(L, StartElementKey) || hasfield(L, EndElementKey))
+    XML_SetElementHandler(p, f_StartElement, f_EndElement);
+  if (hasfield(L, ExternalEntityKey))
+    XML_SetExternalEntityRefHandler(p, f_ExternaEntity);
+  if (hasfield(L, StartNamespaceDeclKey) || hasfield(L, EndNamespaceDeclKey))
+    XML_SetNamespaceDeclHandler(p, f_StartNamespaceDecl, f_EndNamespaceDecl);
+  if (hasfield(L, NotationDeclKey))
+    XML_SetNotationDeclHandler(p, f_NotationDecl);
+  if (hasfield(L, NotStandaloneKey))
+    XML_SetNotStandaloneHandler(p, f_NotStandalone);
+  if (hasfield(L, ProcessingInstructionKey))
+    XML_SetProcessingInstructionHandler(p, f_ProcessingInstruction);
+  if (hasfield(L, UnparsedEntityDeclKey))
+    XML_SetUnparsedEntityDeclHandler(p, f_UnparsedEntityDecl);
+  if (hasfield(L, StartDoctypeDeclKey))
+    XML_SetStartDoctypeDeclHandler(p, f_StartDoctypeDecl);
+  return 1;
+}
+
+
+static lxp_userdata *checkparser (lua_State *L, int idx) {
+  lxp_userdata *xpu = (lxp_userdata *)luaL_checkudata(L, idx, ParserType);
+  luaL_argcheck(L, xpu, idx, "expat parser expected");
+  luaL_argcheck(L, xpu->parser, idx, "parser is closed");
+  return xpu;
+}
+
+
+static int parser_gc (lua_State *L) {
+  lxp_userdata *xpu = (lxp_userdata *)luaL_checkudata(L, 1, ParserType);
+  luaL_argcheck(L, xpu, 1, "expat parser expected");
+  lxpclose(L, xpu);
+  return 0;
+}
+
+
+static int setbase (lua_State *L) {
+  lxp_userdata *xpu = checkparser(L, 1);
+  if (XML_SetBase(xpu->parser, luaL_checkstring(L, 2)) == 0)
+    luaL_error(L, "no memory to store base");
+  return 0;
+}
+
+
+static int getbase (lua_State *L) {
+  lxp_userdata *xpu = checkparser(L, 1);
+  lua_pushstring(L, XML_GetBase(xpu->parser));
+  return 1;
+}
+
+
+static int getcallbacks (lua_State *L) {
+  lxp_userdata *xpu = checkparser(L, 1);
+  lua_rawgeti(L, LUA_REGISTRYINDEX, xpu->tableref);
+  return 1;
+}
+
+
+static int parse_aux (lua_State *L, lxp_userdata *xpu, const char *s,
+                      size_t len) {
+  luaL_Buffer b;
+  int status;
+  xpu->L = L;
+  xpu->state = XPSok;
+  xpu->b = &b;
+  lua_settop(L, 2);
+  lua_rawgeti(L, LUA_REGISTRYINDEX, xpu->tableref); /*lua_getref(L, xpu->tableref);*/  /* to be used by handlers */
+  status = XML_Parse(xpu->parser, s, (int)len, s == NULL);
+  if (xpu->state == XPSstring) dischargestring(xpu);
+  if (xpu->state == XPSerror) {  /* callback error? */
+    lua_rawgeti(L, LUA_REGISTRYINDEX, xpu->tableref);  /* get original msg. */
+    lua_error(L);
+  }
+  if (s == NULL) xpu->state = XPSfinished;
+  if (status) {
+    lua_pushboolean(L, 1);
+    return 1;
+  }
+  else { /* error */
+    return reporterror(xpu);
+  }
+}
+
+
+static int lxp_parse (lua_State *L) {
+  lxp_userdata *xpu = checkparser(L, 1);
+  size_t len;
+  const char *s = luaL_optlstring(L, 2, NULL, &len);
+  if (xpu->state == XPSfinished && s != NULL) {
+    lua_pushnil(L);
+    lua_pushliteral(L, "cannot parse - document is finished");
+    return 2;
+  }
+  return parse_aux(L, xpu, s, len);
+}
+
+
+static int lxp_close (lua_State *L) {
+  int status = 1;
+  lxp_userdata *xpu = (lxp_userdata *)luaL_checkudata(L, 1, ParserType);
+  luaL_argcheck(L, xpu, 1, "expat parser expected");
+  if (xpu->state != XPSfinished)
+    status = parse_aux(L, xpu, NULL, 0);
+  lxpclose(L, xpu);
+  if (status > 1) luaL_error(L, "error closing parser: %s",
+                                lua_tostring(L, -status+1));
+  return 0;
+}
+
+
+static int lxp_pos (lua_State *L) {
+  lxp_userdata *xpu = checkparser(L, 1);
+  XML_Parser p = xpu->parser;
+  lua_pushnumber(L, XML_GetCurrentLineNumber(p));
+  lua_pushnumber(L, XML_GetCurrentColumnNumber(p) + 1);
+  lua_pushnumber(L, XML_GetCurrentByteIndex(p) + 1);
+  return 3;
+}
+
+
+static int lxp_setencoding (lua_State *L) {
+  lxp_userdata *xpu = checkparser(L, 1);
+  const char *encoding = luaL_checkstring(L, 2);
+  luaL_argcheck(L, xpu->state == XPSpre, 1, "invalid parser state");
+  XML_SetEncoding(xpu->parser, encoding);
+  return 0;
+}
+
+static int lxp_stop (lua_State *L) {
+  lxp_userdata *xpu = checkparser(L, 1);
+  lua_pushboolean(L, XML_StopParser(xpu->parser, XML_FALSE) == XML_STATUS_OK);
+  return 1;
+}
+
+#if !defined LUA_VERSION_NUM
+/* Lua 5.0 */
+#define luaL_Reg luaL_reg
+#endif
+
+static const struct luaL_Reg lxp_meths[] = {
+  {"parse", lxp_parse},
+  {"close", lxp_close},
+  {"__gc", parser_gc},
+  {"pos", lxp_pos},
+  {"setencoding", lxp_setencoding},
+  {"getcallbacks", getcallbacks},
+  {"getbase", getbase},
+  {"setbase", setbase},
+  {"stop", lxp_stop},
+  {NULL, NULL}
+};
+
+static const struct luaL_Reg lxp_funcs[] = {
+  {"new", lxp_make_parser},
+  {NULL, NULL}
+};
+
+
+/*
+** Assumes the table is on top of the stack.
+*/
+static void set_info (lua_State *L) {
+	lua_pushliteral (L, "_COPYRIGHT");
+	lua_pushliteral (L, "Copyright (C) 2003-2012 Kepler Project");
+	lua_settable (L, -3);
+	lua_pushliteral (L, "_DESCRIPTION");
+	lua_pushliteral (L, "LuaExpat is a SAX XML parser based on the Expat library");
+	lua_settable (L, -3);
+	lua_pushliteral (L, "_VERSION");
+	lua_pushliteral (L, "LuaExpat 1.3.0");
+	lua_settable (L, -3);
+}
+
+
+#if !defined LUA_VERSION_NUM || LUA_VERSION_NUM==501
+/*
+** Adapted from Lua 5.2.0
+*/
+static void luaL_setfuncs (lua_State *L, const luaL_Reg *l, int nup) {
+  luaL_checkstack(L, nup, "too many upvalues");
+  for (; l->name != NULL; l++) {  /* fill the table with given functions */
+    int i;
+    for (i = 0; i < nup; i++)  /* copy upvalues to the top */
+      lua_pushvalue(L, -nup);
+    lua_pushstring(L, l->name);
+    lua_pushcclosure(L, l->func, nup);  /* closure with those upvalues */
+    lua_settable(L, -(nup + 3));
+  }
+  lua_pop(L, nup);  /* remove upvalues */
+}
+#endif
+
+
+int luaopen_lxp (lua_State *L) {
+	luaL_newmetatable(L, ParserType);
+
+	lua_pushliteral(L, "__index");
+	lua_pushvalue(L, -2);
+	lua_rawset(L, -3);
+
+	luaL_setfuncs (L, lxp_meths, 0);
+	lua_pop (L, 1); /* remove metatable */
+
+	// _X 2013_04_09: Modified to allow embedding
+	luaL_openlib (L, "lxp", lxp_funcs, 0);
+	/*
+	lua_newtable (L);
+	luaL_setfuncs (L, lxp_funcs, 0);
+	*/
+	set_info (L);
+	return 1;
+}
diff --git a/lib/luaexpat/lxplib.h b/lib/luaexpat/lxplib.h
new file mode 100644
index 000000000..9c0be4f78
--- /dev/null
+++ b/lib/luaexpat/lxplib.h
@@ -0,0 +1,24 @@
+/*
+** See Copyright Notice in license.html
+*/
+
+#define ParserType	"Expat"
+
+#define StartCdataKey			"StartCdataSection"
+#define EndCdataKey			"EndCdataSection"
+#define CharDataKey			"CharacterData"
+#define CommentKey			"Comment"
+#define DefaultKey			"Default"
+#define DefaultExpandKey		"DefaultExpand"
+#define StartElementKey			"StartElement"
+#define EndElementKey			"EndElement"
+#define ExternalEntityKey		"ExternalEntityRef"
+#define StartNamespaceDeclKey		"StartNamespaceDecl"
+#define EndNamespaceDeclKey		"EndNamespaceDecl"
+#define NotationDeclKey			"NotationDecl"
+#define NotStandaloneKey		"NotStandalone"
+#define ProcessingInstructionKey	"ProcessingInstruction"
+#define UnparsedEntityDeclKey		"UnparsedEntityDecl"
+#define StartDoctypeDeclKey		"StartDoctypeDecl"
+
+int luaopen_lxp (lua_State *L);