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LexLPeg.cxx
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LexLPeg.cxx
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/**
* Copyright 2006-2020 Mitchell. See LICENSE.
* Lua-powered dynamic language lexer for Scintillua.
* For documentation on writing lexers, see *lexers/lexer.lua*.
*/
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <assert.h>
#include <ctype.h>
#if CURSES
#include <curses.h>
#endif
#include <set>
#include <sstream>
#include <vector>
#if !_WIN32
#include <dirent.h>
#else
#include <io.h>
#endif
#include "ILexer.h"
#include "Scintilla.h"
#include "SciLexer.h"
#include "PropSetSimple.h"
#include "LexAccessor.h"
#include "LexerModule.h"
#include "DefaultLexer.h"
extern "C" {
#include "lua.h"
#include "lualib.h"
#include "lauxlib.h"
LUALIB_API int luaopen_lpeg(lua_State *L);
}
using namespace Scintilla;
#ifndef NDEBUG
#define RECORD_STACK_TOP(l) int orig_stack_top = lua_gettop(l)
#define ASSERT_STACK_TOP(l) assert(lua_gettop(l) == orig_stack_top)
#else
#define RECORD_STACK_TOP(_) (void)0
#define ASSERT_STACK_TOP(_) (void)0
#endif
#if LUA_VERSION_NUM < 502
#define luaL_traceback(_,__,___,____) (void)0
#define luaL_requiref(l, s, f, _) \
(lua_pushcfunction(l, f), lua_pushstring(l, s), lua_call(l, 1, 1))
#define lua_rawlen lua_objlen
#define LUA_OK 0
#define lua_rawgetp(l, i, p) \
(lua_pushlightuserdata(l, p), lua_rawget(l, i), lua_type(l, -1))
#define lua_rawsetp(l, i, p) \
(lua_pushlightuserdata(l, p), lua_insert(l, -2), lua_rawset(l, i))
#endif
#if LUA_VERSION_NUM < 503
#define lua_getfield(l, i, k) (lua_getfield(l, i, k), lua_type(l, -1))
#define lua_rawget(l, i) (lua_rawget(l, i), lua_type(l, -1))
#endif
#define SCLEX_LPEG -1
/** The LPeg Scintilla lexer. */
class LexerLPeg : public DefaultLexer {
/**
* The lexer's Lua state.
* It is cleared each time the lexer language changes unless `ownLua` is
* `true`.
*/
lua_State *L;
/**
* The flag indicating whether or not the Lua State is owned by the lexer.
*/
bool ownLua = true;
/**
* The set of properties for the lexer.
* The LexerHomeKey and LexerNameKey properties must be defined before running
* the lexer.
* For use with SciTE, all of the style property strings generated for the
* current lexer are placed in here.
*/
PropSetSimple props;
/** The function to send Scintilla messages with. */
SciFnDirect SS = nullptr;
/** The Scintilla object the lexer belongs to. */
sptr_t sci = 0;
/**
* The flag indicating whether or not the lexer needs to be re-initialized.
* Re-initialization is required after the lexer language changes.
*/
bool reinit = true;
/**
* The flag indicating whether or not the lexer language has embedded lexers.
*/
bool multilang = false;
/**
* The list of style numbers considered to be whitespace styles.
* This is used in multi-language lexers when backtracking to whitespace to
* determine which lexer grammar to use.
*/
bool ws[STYLE_MAX + 1];
/** List of known lexer names. */
std::set<std::string> lexerNames;
/** Style name to return for `NameOfStyle()`. */
std::string styleName;
/**
* Searches the given directory for lexers and records their names.
* @param path Path to a directory containing lexers.
*/
void ReadLexerNames(const char *path);
/**
* Logs the given error message or a Lua error message, prints it, and clears
* the stack.
* Error messages are logged to the LexerErrorKey property.
* @param L The Lua State.
* @param str The error message to log and print. If `nullptr`, logs and
* prints the Lua error message at the top of the stack.
* @param print Whether or not to print the error to stderr.
*/
void LogError(lua_State *L, const char *str = nullptr, bool print = true);
/**
* Parses the given style string to set the properties for the given style
* number.
* Style strings mimic SciTE's "style.*.stylenumber" properties.
* (https://scintilla.org/SciTEDoc.html)
* @param num The style number to set properties for.
* @param style The style string containing properties to set.
*/
void SetStyle(int num, const char *style);
/**
* Iterates through the lexer's `_TOKENSTYLES`, setting the style properties
* for all defined styles, or for SciTE, generates the set of style properties
* instead of directly setting style properties.
*/
void SetStyles();
/**
* Initializes the lexer once the LexerHomeKey and LexerNameKey properties are
* set.
*/
bool Init();
/**
* When *lparam* is `0`, returns the size of the buffer needed to store the
* given string *str* in; otherwise copies *str* into the buffer *lparam* and
* returns the number of bytes copied.
* @param lparam `0` to get the number of bytes needed to store *str* or a
* pointer to a buffer large enough to copy *str* into.
* @param str The string to copy.
* @return number of bytes needed to hold *str*
*/
void *StringResult(long lparam, const char *str);
public:
// Lexer property keys.
static constexpr const char *LexerErrorKey = "lexer.lpeg.error";
static constexpr const char *LexerHomeKey = "lexer.lpeg.home";
static constexpr const char *LexerNameKey = "lexer.lpeg.name";
static constexpr const char *LexerThemeKey = "lexer.lpeg.color.theme";
/** Constructor. */
LexerLPeg();
/** Destructor. */
virtual ~LexerLPeg() = default;
/** Destroys the lexer object. */
void SCI_METHOD Release() override;
/**
* Lexes the Scintilla document.
* @param startPos The position in the document to start lexing at.
* @param lengthDoc The number of bytes in the document to lex.
* @param initStyle The initial style at position *startPos* in the document.
* @param buffer The document interface.
*/
void SCI_METHOD Lex(
Sci_PositionU startPos, Sci_Position lengthDoc, int initStyle,
IDocument *buffer) override;
/**
* Folds the Scintilla document.
* @param startPos The position in the document to start folding at.
* @param lengthDoc The number of bytes in the document to fold.
* @param initStyle The initial style at position *startPos* in the document.
* @param buffer The document interface.
*/
void SCI_METHOD Fold(
Sci_PositionU startPos, Sci_Position lengthDoc, int, IDocument *buffer)
override;
/**
* Sets the *key* lexer property to *value*.
* If *key* starts with "style.", also set the style for the token.
* @param key The string property key.
* @param val The string value.
*/
Sci_Position SCI_METHOD PropertySet(
const char *key, const char *value) override;
/**
* Allows for direct communication between the application and the lexer.
* The application uses this to set `SS`, `sci`, `L`, and lexer properties,
* and to retrieve style names.
* @param code The communication code.
* @param arg The argument.
* @return void *data
*/
void * SCI_METHOD PrivateCall(int code, void *arg) override;
/**
* Returns the style name for the given style number.
* Note: the returned pointer is not guaranteed to exist after the next call
* to `NameOfStyle()`, so its contents should be immediately copied.
* @param style The style number to get the style name for.
* @return style name or nullptr
*/
const char * SCI_METHOD NameOfStyle(int style) override;
/**
* Returns the lexer property for *key*.
* @param key The string property key.
*/
const char * SCI_METHOD PropertyGet(const char *key) override;
/** Constructs a new instance of the lexer. */
static ILexer5 *LexerFactoryLPeg();
};
/** Lua pcall error message handler that adds a traceback. */
static int lua_error_handler(lua_State *L) {
luaL_traceback(L, L, lua_tostring(L, -1), 1);
return 1;
}
/** lexer.property[key] metamethod. */
static int lexer_property_index(lua_State *L) {
const char *property = lua_tostring(L, lua_upvalueindex(1));
lua_getfield(L, LUA_REGISTRYINDEX, "sci_lexer_lpeg");
LexerLPeg *lexer = reinterpret_cast<LexerLPeg *>(lua_touserdata(L, -1));
lua_rawgetp(L, LUA_REGISTRYINDEX, lua_touserdata(L, -1));
lua_getfield(L, -1, "_BUFFER");
auto buffer = static_cast<IDocument *>(lua_touserdata(L, -1));
if (strcmp(property, "fold_level") == 0) {
luaL_argcheck(L, buffer, 1, "must be lexing or folding");
lua_pushinteger(L, buffer->GetLevel(luaL_checkinteger(L, 2) - 1));
} else if (strcmp(property, "indent_amount") == 0) {
luaL_argcheck(L, buffer, 1, "must be lexing or folding");
lua_pushinteger(L, buffer->GetLineIndentation(luaL_checkinteger(L, 2) - 1));
} else if (strcmp(property, "property") == 0) {
lua_pushstring(L, lexer->PropertyGet(luaL_checkstring(L, 2)));
} else if (strcmp(property, "property_int") == 0) {
lua_pushstring(L, lexer->PropertyGet(luaL_checkstring(L, 2)));
lua_pushinteger(L, lua_tointeger(L, -1));
} else if (strcmp(property, "style_at") == 0) {
luaL_argcheck(L, buffer, 1, "must be lexing or folding");
int style = buffer->StyleAt(luaL_checkinteger(L, 2) - 1);
lua_getfield(L, 4, "_TOKENSTYLES");
for (lua_pushnil(L); lua_next(L, -2); lua_pop(L, 1))
if (luaL_checkinteger(L, -1) - 1 == style) break;
lua_pop(L, 1); // style_num, leaving name on top
} else if (strcmp(property, "line_state") == 0) {
luaL_argcheck(L, buffer, 1, "must be lexing or folding");
lua_pushinteger(L, buffer->GetLineState(luaL_checkinteger(L, 2) - 1));
}
return 1;
}
/** lexer.property[key] = value metamethod. */
static int lexer_property_newindex(lua_State *L) {
const char *property = lua_tostring(L, lua_upvalueindex(1));
luaL_argcheck(
L, strcmp(property, "fold_level") != 0 &&
strcmp(property, "indent_amount") != 0 &&
strcmp(property, "property_int") != 0 &&
strcmp(property, "style_at") != 0 &&
strcmp(property, "line_from_position") != 0, 3, "read-only property");
lua_getfield(L, LUA_REGISTRYINDEX, "sci_lexer_lpeg");
LexerLPeg *lexer = reinterpret_cast<LexerLPeg *>(lua_touserdata(L, -1));
lua_rawgetp(L, LUA_REGISTRYINDEX, lua_touserdata(L, -1));
if (strcmp(property, "property") == 0)
lexer->PropertySet(luaL_checkstring(L, 2), luaL_checkstring(L, 3));
else if (strcmp(property, "line_state") == 0) {
luaL_argcheck(
L, lua_getfield(L, -1, "_BUFFER"), 1, "must be lexing or folding");
auto buffer = static_cast<IDocument *>(lua_touserdata(L, -1));
buffer->SetLineState(luaL_checkinteger(L, 2) - 1, luaL_checkinteger(L, 3));
}
return 0;
}
/** The lexer's `line_from_position` Lua function. */
static int line_from_position(lua_State *L) {
auto buffer = static_cast<IDocument *>(
lua_touserdata(L, lua_upvalueindex(1)));
lua_pushinteger(L, buffer->LineFromPosition(luaL_checkinteger(L, 1) - 1) + 1);
return 1;
}
/** lexer.property metamethod. */
static int lexer_index(lua_State *L) {
const char *key = lua_tostring(L, 2);
if (strcmp(key, "fold_level") == 0 || strcmp(key, "indent_amount") == 0 ||
strcmp(key, "property") == 0 || strcmp(key, "property_int") == 0 ||
strcmp(key, "style_at") == 0 || strcmp(key, "line_state") == 0) {
lua_newtable(L);
lua_createtable(L, 0, 2);
lua_pushvalue(L, 2), lua_pushcclosure(L, lexer_property_index, 1);
lua_setfield(L, -2, "__index");
lua_pushvalue(L, 2), lua_pushcclosure(L, lexer_property_newindex, 1);
lua_setfield(L, -2, "__newindex");
lua_setmetatable(L, -2);
} else if (strcmp(key, "line_from_position") == 0) {
lua_getfield(L, LUA_REGISTRYINDEX, "sci_lexer_lpeg");
lua_rawgetp(L, LUA_REGISTRYINDEX, lua_touserdata(L, -1));
luaL_argcheck(
L, lua_getfield(L, -1, "_BUFFER"), 2, "must be lexing or folding");
lua_pushcclosure(L, line_from_position, 1);
} else if (strncmp(key, "fold", 4) == 0) {
// Alias lexer.fold* to lexer.property['fold*'].
if (strcmp(key, "folding") == 0) key = "fold"; // lexer.fold() exists
lua_getfield(L, LUA_REGISTRYINDEX, "sci_lexer_lpeg");
LexerLPeg *lexer = reinterpret_cast<LexerLPeg *>(lua_touserdata(L, -1));
const char *value = lexer->PropertyGet(luaL_gsub(L, key, "_", "."));
lua_pushboolean(L, strcmp(value, "1") == 0);
} else lua_rawget(L, 1);
return 1;
}
/** lexer.property = value metamethod. */
static int lexer_newindex(lua_State *L) {
const char *key = lua_tostring(L, 2);
luaL_argcheck(
L, strcmp(key, "fold_level") != 0 && strcmp(key, "indent_amount") != 0 &&
strcmp(key, "property") != 0 && strcmp(key, "property_int") != 0 &&
strcmp(key, "style_at") != 0 && strcmp(key, "line_state") != 0 &&
strcmp(key, "line_from_position") != 0, 3, "read-only property");
if (strncmp(key, "fold", 4) == 0 && strcmp(key, "fold_level") != 0) {
// Alias lexer.fold* to lexer.property['fold*'].
if (strcmp(key, "folding") == 0) key = "fold"; // lexer.fold() exists
key = luaL_gsub(L, key, "_", ".");
lua_getfield(L, LUA_REGISTRYINDEX, "sci_lexer_lpeg");
LexerLPeg *lexer = reinterpret_cast<LexerLPeg *>(lua_touserdata(L, -1));
if (lua_toboolean(L, 3))
lexer->PropertySet(
key, (!lua_isnumber(L, 3) || lua_tonumber(L, 3) == 1) ? "1" : "0");
else
lexer->PropertySet(key, "0");
} else lua_rawset(L, 1);
return 0;
}
/**
* Replaces the string property key the top of the stack with its expanded
* value.
* Invokes `lexer.property_expanded[]` to perform the expansion.
* @param L The Lua State.
*/
static void expand_property(lua_State *L) {
RECORD_STACK_TOP(L);
lua_getfield(L, LUA_REGISTRYINDEX, "_LOADED"), lua_getfield(L, -1, "lexer");
lua_getfield(L, -1, "property_expanded");
lua_pushvalue(L, -4), lua_gettable(L, -2), lua_replace(L, -5);
lua_pop(L, 3); // property_expanded, lexer, _LOADED
ASSERT_STACK_TOP(L);
}
void LexerLPeg::ReadLexerNames(const char *path) {
#if !_WIN32
DIR *dir = opendir(path);
if (!dir) return;
struct dirent *entry;
while ((entry = readdir(dir))) {
char *p = strstr(entry->d_name, ".lua");
if (p) lexerNames.emplace(entry->d_name, p - entry->d_name);
}
closedir(dir);
#else
struct _finddata_t file;
std::string glob(path);
glob += "/*";
intptr_t handle = _findfirst(glob.c_str(), &file);
if (handle == -1) return;
do {
char *p = strstr(file.name, ".lua");
if (p) lexerNames.emplace(file.name, p - file.name);
} while (_findnext(handle, &file) != -1);
_findclose(handle);
#endif
}
void LexerLPeg::LogError(lua_State *L, const char *str, bool print) {
const char *value = str ? str : lua_tostring(L, -1);
PropertySet(LexerErrorKey, value);
if (print) fprintf(stderr, "Lua Error: %s.\n", value);
lua_settop(L, 0);
}
void LexerLPeg::SetStyle(int num, const char *style) {
auto style_copy = static_cast<char *>(malloc(strlen(style) + 1));
char *key = strcpy(style_copy, style), *next = nullptr, *val = nullptr;
while (key) {
if ((next = strchr(key, ','))) *next++ = '\0';
if ((val = strchr(key, ':'))) *val++ = '\0';
if (strcmp(key, "font") == 0 && val)
SS(sci, SCI_STYLESETFONT, num, reinterpret_cast<sptr_t>(val));
else if (strcmp(key, "size") == 0 && val)
SS(sci, SCI_STYLESETSIZE, num, static_cast<int>(atoi(val)));
else if (strcmp(key, "bold") == 0 || strcmp(key, "notbold") == 0 ||
strcmp(key, "weight") == 0) {
#if !CURSES
int weight = SC_WEIGHT_NORMAL;
if (*key == 'b')
weight = SC_WEIGHT_BOLD;
else if (*key == 'w' && val)
weight = atoi(val);
SS(sci, SCI_STYLESETWEIGHT, num, weight);
#else
// Scintilla curses requires font attributes to be stored in the "font
// weight" style attribute.
// First, clear any existing SC_WEIGHT_NORMAL, SC_WEIGHT_SEMIBOLD, or
// SC_WEIGHT_BOLD values stored in the lower 16 bits. Then set the
// appropriate curses attr.
sptr_t weight =
SS(sci, SCI_STYLEGETWEIGHT, num, 0) & ~(A_COLOR | A_CHARTEXT);
int bold =
*key == 'b' || (*key == 'w' && val && atoi(val) > SC_WEIGHT_NORMAL);
SS(
sci, SCI_STYLESETWEIGHT, num,
bold ? weight | A_BOLD : weight & ~A_BOLD);
#endif
} else if (strcmp(key, "italics") == 0 || strcmp(key, "notitalics") == 0)
SS(sci, SCI_STYLESETITALIC, num, *key == 'i');
else if (strcmp(key, "underlined") == 0 ||
strcmp(key, "notunderlined") == 0) {
#if !CURSES
SS(sci, SCI_STYLESETUNDERLINE, num, *key == 'u');
#else
// Scintilla curses requires font attributes to be stored in the "font
// weight" style attribute.
// First, clear any existing SC_WEIGHT_NORMAL, SC_WEIGHT_SEMIBOLD, or
// SC_WEIGHT_BOLD values stored in the lower 16 bits. Then set the
// appropriate curses attr.
sptr_t weight =
SS(sci, SCI_STYLEGETWEIGHT, num, 0) & ~(A_COLOR | A_CHARTEXT);
SS(
sci, SCI_STYLESETWEIGHT, num,
(*key == 'u') ? weight | A_UNDERLINE : weight & ~A_UNDERLINE);
#endif
} else if ((strcmp(key, "fore") == 0 || strcmp(key, "back") == 0) &&
val) {
int msg = (*key == 'f') ? SCI_STYLESETFORE : SCI_STYLESETBACK;
int color = static_cast<int>(strtol(val, nullptr, 0));
if (*val == '#') { // #RRGGBB format; Scintilla format is 0xBBGGRR
color = static_cast<int>(strtol(val + 1, nullptr, 16));
color =
((color & 0xFF0000) >> 16) | (color & 0xFF00) |
((color & 0xFF) << 16); // convert to 0xBBGGRR
}
SS(sci, msg, num, color);
} else if (strcmp(key, "eolfilled") == 0 ||
strcmp(key, "noteolfilled") == 0)
SS(sci, SCI_STYLESETEOLFILLED, num, *key == 'e');
else if (strcmp(key, "characterset") == 0 && val)
SS(sci, SCI_STYLESETCHARACTERSET, num, static_cast<int>(atoi(val)));
else if (strcmp(key, "case") == 0 && val) {
if (*val == 'u')
SS(sci, SCI_STYLESETCASE, num, SC_CASE_UPPER);
else if (*val == 'l')
SS(sci, SCI_STYLESETCASE, num, SC_CASE_LOWER);
} else if (strcmp(key, "visible") == 0 || strcmp(key, "notvisible") == 0)
SS(sci, SCI_STYLESETVISIBLE, num, *key == 'v');
else if (strcmp(key, "changeable") == 0 ||
strcmp(key, "notchangeable") == 0)
SS(sci, SCI_STYLESETCHANGEABLE, num, *key == 'c');
else if (strcmp(key, "hotspot") == 0 || strcmp(key, "nothotspot") == 0)
SS(sci, SCI_STYLESETHOTSPOT, num, *key == 'h');
key = next;
}
free(style_copy);
}
void LexerLPeg::SetStyles() {
RECORD_STACK_TOP(L);
if (!lua_rawgetp(L, LUA_REGISTRYINDEX, reinterpret_cast<void *>(this))) {
lua_pop(L, 1); // lexer object
ASSERT_STACK_TOP(L);
return;
}
// If the lexer defines additional styles, set their properties first (if
// the user has not already defined them).
lua_getfield(L, -1, "_EXTRASTYLES");
for (lua_pushnil(L); lua_next(L, -2); lua_pop(L, 1))
if (lua_isstring(L, -2) && lua_isstring(L, -1)) {
lua_pushstring(L, "style."), lua_pushvalue(L, -3), lua_concat(L, 2);
if (!*props.Get(lua_tostring(L, -1)))
PropertySet(lua_tostring(L, -1), lua_tostring(L, -2));
lua_pop(L, 1); // style name
}
lua_pop(L, 1); // _EXTRASTYLES
lua_getfield(L, -1, "_TOKENSTYLES");
#if NO_SCITE
if (!SS || !sci) {
lua_pop(L, 2); // _TOKENSTYLES, lexer object
// Skip, but do not report an error since `reinit` would remain `false`
// and subsequent calls to `Lex()` and `Fold()` would repeatedly call this
// function and error.
ASSERT_STACK_TOP(L);
return;
}
lua_pushstring(L, "style.default"), expand_property(L);
SetStyle(STYLE_DEFAULT, lua_tostring(L, -1));
lua_pop(L, 1); // style
SS(sci, SCI_STYLECLEARALL, 0, 0); // set default styles
for (lua_pushnil(L); lua_next(L, -2); lua_pop(L, 1))
if (lua_isstring(L, -2) && lua_isnumber(L, -1) &&
lua_tointeger(L, -1) - 1 != STYLE_DEFAULT) {
lua_pushstring(L, "style."), lua_pushvalue(L, -3), lua_concat(L, 2);
expand_property(L);
SetStyle(lua_tointeger(L, -2) - 1, lua_tostring(L, -1));
lua_pop(L, 1); // style
}
#else
char prop_name[32];
for (lua_pushnil(L); lua_next(L, -2); lua_pop(L, 1))
if (lua_isstring(L, -2) && lua_isnumber(L, -1)) {
sprintf(
prop_name, "style.lpeg.%0d",
static_cast<int>(lua_tointeger(L, -1)) - 1);
lua_pushstring(L, "style."), lua_pushvalue(L, -3), lua_concat(L, 2);
expand_property(L);
PropertySet(prop_name, lua_tostring(L, -1));
lua_pop(L, 1); // style
}
#endif
lua_pop(L, 2); // _TOKENSTYLES, lexer object
ASSERT_STACK_TOP(L);
}
bool LexerLPeg::Init() {
if (!props.GetExpanded(LexerHomeKey, nullptr) ||
!*props.Get(LexerNameKey) || !L)
return false;
char *_home = reinterpret_cast<char *>(
malloc(props.GetExpanded(LexerHomeKey, nullptr) + 1));
props.GetExpanded(LexerHomeKey, _home);
std::string home(_home);
free(_home);
const char *lexer = props.Get(LexerNameKey);
RECORD_STACK_TOP(L);
// Designate the currently running LexerLPeg instance.
// This needs to be done prior to calling any Lua lexer code, particularly
// when `ownLua` is `false`, as there may be multiple LexerLPeg instances
// floating around, and the lexer module methods and metamethods need to
// know which instance to use.
lua_pushlightuserdata(L, reinterpret_cast<void *>(this));
lua_setfield(L, LUA_REGISTRYINDEX, "sci_lexer_lpeg");
// Determine where to look for the lexer module and themes.
std::vector<std::string> dirs;
size_t start = 0, end;
while ((end = home.find(';', start)) != std::string::npos) {
dirs.emplace_back(home, start, end - start);
start = end + 1;
}
dirs.emplace_back(home, start);
// If necessary, load the lexer module.
lua_getfield(L, LUA_REGISTRYINDEX, "_LOADED");
if (lua_getfield(L, -1, "lexer") == LUA_TNIL) {
for (const std::string& dir : dirs) {
lua_pushstring(L, dir.c_str());
lua_pushstring(L, "/lexer.lua");
lua_concat(L, 2);
int status = luaL_loadfile(L, lua_tostring(L, -1));
if (status == LUA_ERRFILE) {
lua_pop(L, 2); // error message, filename
continue; // try next directory
}
lua_remove(L, -2); // filename
lua_pushcfunction(L, lua_error_handler);
lua_insert(L, -2);
if (status == LUA_OK && lua_pcall(L, 0, 1, -2) == LUA_OK) break;
return (LogError(L), false);
}
if (lua_isnil(L, -1))
return (LogError(L, "'lexer.lua' module not found", false), false);
lua_remove(L, -2); // lua_error_handler
lua_replace(L, -2); // nil
lua_pushinteger(L, SC_FOLDLEVELBASE);
lua_setfield(L, -2, "FOLD_BASE");
lua_pushinteger(L, SC_FOLDLEVELWHITEFLAG);
lua_setfield(L, -2, "FOLD_BLANK");
lua_pushinteger(L, SC_FOLDLEVELHEADERFLAG);
lua_setfield(L, -2, "FOLD_HEADER");
lua_createtable(L, 0, 2);
lua_pushcfunction(L, lexer_index), lua_setfield(L, -2, "__index");
lua_pushcfunction(L, lexer_newindex), lua_setfield(L, -2, "__newindex");
lua_setmetatable(L, -2);
lua_pushvalue(L, -1), lua_setfield(L, -3, "lexer");
}
lua_replace(L, -2);
// Update the userdata needed by lexer metamethods.
lua_pushvalue(L, -1);
lua_rawsetp(L, LUA_REGISTRYINDEX, reinterpret_cast<void *>(this));
// Load the language lexer.
if (lua_getfield(L, -1, "load") != LUA_TFUNCTION)
return (LogError(L, "'lexer.load' function not found"), false);
lua_pushcfunction(L, lua_error_handler), lua_insert(L, -2);
lua_pushstring(L, lexer), lua_pushnil(L), lua_pushboolean(L, 1);
if (lua_pcall(L, 3, 1, -5) != LUA_OK) {
bool print = !strstr(lua_tostring(L, -1), "no file");
return (LogError(L, nullptr, print), false);
}
lua_remove(L, -2); // lua_error_handler
lua_remove(L, -2); // lexer module
lua_rawsetp(L, LUA_REGISTRYINDEX, reinterpret_cast<void *>(this));
// Load the theme and set up styles.
if (props.GetExpanded(LexerThemeKey, nullptr)) {
char *theme = reinterpret_cast<char *>(
malloc(props.GetExpanded(LexerThemeKey, nullptr) + 1));
props.GetExpanded(LexerThemeKey, theme);
if (!strstr(theme, "/") && !strstr(theme, "\\")) { // theme name
for (const std::string& dir : dirs) {
lua_pushstring(L, dir.c_str());
lua_pushstring(L, "/themes/");
lua_pushstring(L, theme);
lua_pushstring(L, ".lua");
lua_concat(L, 4);
if (luaL_loadfile(L, lua_tostring(L, -1)) != LUA_ERRFILE ||
dir == dirs.back()) {
lua_pop(L, 1); // function, leaving filename on top
break;
}
lua_pop(L, 2); // error message, filename
}
} else lua_pushstring(L, theme); // path to theme
lua_pushcfunction(L, lua_error_handler);
lua_insert(L, -2);
if (luaL_loadfile(L, lua_tostring(L, -1)) == LUA_OK &&
lua_pcall(L, 0, 0, -3) == LUA_OK)
lua_pop(L, 2); // theme, lua_error_handler
else
LogError(L);
free(theme);
}
SetStyles();
// If the lexer is a parent, it will have children in its _CHILDREN table.
// In that case, determine which styles are language whitespace styles
// ([lang]_whitespace). This is necessary for determining which language
// to start lexing with.
lua_rawgetp(L, LUA_REGISTRYINDEX, reinterpret_cast<void *>(this));
if (lua_getfield(L, -1, "_CHILDREN") == LUA_TTABLE) {
multilang = true;
for (int i = 0; i <= STYLE_MAX; i++)
ws[i] = strstr(NameOfStyle(i), "whitespace") ? true : false;
}
lua_pop(L, 2); // _CHILDREN, lexer object
reinit = false;
PropertySet(LexerErrorKey, "");
ASSERT_STACK_TOP(L);
return true;
}
void *LexerLPeg::StringResult(long lparam, const char *str) {
if (lparam) strcpy(reinterpret_cast<char *>(lparam), str);
return reinterpret_cast<void *>(strlen(str));
}
LexerLPeg::LexerLPeg() : DefaultLexer("lpeg", SCLEX_LPEG), L(luaL_newstate()) {
// Initialize the Lua state, load libraries, and set platform variables.
if (!L) {
fprintf(stderr, "Lua failed to initialize.\n");
return;
}
#if LUA_VERSION_NUM < 502
luaL_requiref(L, "", luaopen_base, 1), lua_pop(L, 1);
#else
luaL_requiref(L, "_G", luaopen_base, 1), lua_pop(L, 1);
#endif
luaL_requiref(L, LUA_TABLIBNAME, luaopen_table, 1), lua_pop(L, 1);
luaL_requiref(L, LUA_STRLIBNAME, luaopen_string, 1), lua_pop(L, 1);
// TODO: figure out why lua_setglobal() is needed for lpeg.
luaL_requiref(L, "lpeg", luaopen_lpeg, 1), lua_setglobal(L, "lpeg");
#if _WIN32
lua_pushboolean(L, 1), lua_setglobal(L, "WIN32");
#endif
#if __APPLE__
lua_pushboolean(L, 1), lua_setglobal(L, "OSX");
#endif
#if GTK
lua_pushboolean(L, 1), lua_setglobal(L, "GTK");
#endif
#if CURSES
lua_pushboolean(L, 1), lua_setglobal(L, "CURSES");
#endif
}
void SCI_METHOD LexerLPeg::Release() {
if (ownLua && L)
lua_close(L);
else if (!ownLua) {
lua_pushnil(L);
lua_rawsetp(L, LUA_REGISTRYINDEX, reinterpret_cast<void *>(this));
lua_pushnil(L), lua_setfield(L, LUA_REGISTRYINDEX, "sci_lexer_lpeg");
}
delete this;
}
void SCI_METHOD LexerLPeg::Lex(
Sci_PositionU startPos, Sci_Position lengthDoc, int initStyle,
IDocument *buffer)
{
LexAccessor styler(buffer);
if ((reinit && !Init()) || !L) {
// Style everything in the default style.
styler.StartAt(startPos);
styler.StartSegment(startPos);
styler.ColourTo(startPos + lengthDoc - 1, STYLE_DEFAULT);
styler.Flush();
return;
}
RECORD_STACK_TOP(L);
lua_pushlightuserdata(L, reinterpret_cast<void *>(this));
lua_setfield(L, LUA_REGISTRYINDEX, "sci_lexer_lpeg");
lua_rawgetp(L, LUA_REGISTRYINDEX, reinterpret_cast<void *>(this));
lua_pushlightuserdata(L, reinterpret_cast<void *>(buffer));
lua_setfield(L, -2, "_BUFFER");
// Ensure the lexer has a grammar.
// This could be done in the lexer module's `lex()`, but for large files,
// passing string arguments from C to Lua is expensive.
if (!lua_getfield(L, -1, "_GRAMMAR")) {
lua_pop(L, 2); // _GRAMMAR, lexer object
// Style everything in the default style.
styler.StartAt(startPos);
styler.StartSegment(startPos);
styler.ColourTo(startPos + lengthDoc - 1, STYLE_DEFAULT);
styler.Flush();
return;
} else lua_pop(L, 1); // _GRAMMAR
// Start from the beginning of the current style so LPeg matches it.
// For multilang lexers, start at whitespace since embedded languages have
// [lang]_whitespace styles. This is so LPeg can start matching child
// languages instead of parent ones if necessary.
if (startPos > 0) {
Sci_PositionU i = startPos;
while (i > 0 && styler.StyleAt(i - 1) == initStyle) i--;
if (multilang)
while (i > 0 && !ws[static_cast<size_t>(styler.StyleAt(i))]) i--;
lengthDoc += startPos - i, startPos = i;
}
if (lua_getfield(L, -1, "lex") != LUA_TFUNCTION)
return LogError(L, "'lexer.lex' function not found");
lua_pushcfunction(L, lua_error_handler), lua_insert(L, -2);
lua_pushvalue(L, -3);
lua_pushlstring(L, buffer->BufferPointer() + startPos, lengthDoc);
lua_pushinteger(L, styler.StyleAt(startPos) + 1);
if (lua_pcall(L, 3, 1, -5) != LUA_OK) return LogError(L);
if (!lua_istable(L, -1))
return LogError(L, "Table of tokens expected from 'lexer.lex'");
// Style the text from the token table returned.
int len = lua_rawlen(L, -1);
if (len > 0) {
int style = STYLE_DEFAULT;
styler.StartAt(startPos);
styler.StartSegment(startPos);
lua_getfield(L, -3, "_TOKENSTYLES");
// Loop through token-position pairs.
for (int i = 1; i < len; i += 2) {
style = STYLE_DEFAULT;
if (lua_rawgeti(L, -2, i), lua_rawget(L, -2))
style = lua_tointeger(L, -1) - 1;
lua_pop(L, 1); // _TOKENSTYLES[token]
lua_rawgeti(L, -2, i + 1); // pos
unsigned int position = lua_tointeger(L, -1) - 1;
lua_pop(L, 1); // pos
if (style >= 0 && style <= STYLE_MAX)
styler.ColourTo(startPos + position - 1, style);
else
lua_pushfstring(L, "Bad style number: %d", style), LogError(L);
if (position > startPos + lengthDoc) break;
}
lua_pop(L, 1); // _TOKENSTYLES
styler.ColourTo(startPos + lengthDoc - 1, style);
styler.Flush();
}
lua_pop(L, 3); // token table returned, lua_error_handler, lexer object
ASSERT_STACK_TOP(L);
}
void SCI_METHOD LexerLPeg::Fold(
Sci_PositionU startPos, Sci_Position lengthDoc, int, IDocument *buffer)
{
if ((reinit && !Init()) || !L) return;
RECORD_STACK_TOP(L);
lua_pushlightuserdata(L, reinterpret_cast<void *>(this));
lua_setfield(L, LUA_REGISTRYINDEX, "sci_lexer_lpeg");
lua_rawgetp(L, LUA_REGISTRYINDEX, reinterpret_cast<void *>(this));
lua_pushlightuserdata(L, reinterpret_cast<void *>(buffer));
lua_setfield(L, -2, "_BUFFER");
LexAccessor styler(buffer);
if (lua_getfield(L, -1, "fold") != LUA_TFUNCTION)
return LogError(L, "'lexer.fold' function not found");
lua_pushcfunction(L, lua_error_handler), lua_insert(L, -2);
lua_pushvalue(L, -3);
Sci_Position currentLine = styler.GetLine(startPos);
lua_pushlstring(L, buffer->BufferPointer() + startPos, lengthDoc);
lua_pushinteger(L, startPos + 1);
lua_pushinteger(L, currentLine + 1);
lua_pushinteger(L, styler.LevelAt(currentLine) & SC_FOLDLEVELNUMBERMASK);
if (lua_pcall(L, 5, 1, -7) != LUA_OK) return LogError(L);
if (!lua_istable(L, -1))
return LogError(L, "Table of folds expected from 'lexer.fold'");
// Fold the text from the fold table returned.
for (lua_pushnil(L); lua_next(L, -2); lua_pop(L, 1)) // line = level
styler.SetLevel(lua_tointeger(L, -2) - 1, lua_tointeger(L, -1));
lua_pop(L, 3); // fold table returned, lua_error_handler, lexer object
ASSERT_STACK_TOP(L);
}
Sci_Position SCI_METHOD LexerLPeg::PropertySet(
const char *key, const char *value)
{
props.Set(key, value, strlen(key), strlen(value));
if (strcmp(key, LexerHomeKey) == 0 && lexerNames.empty())
ReadLexerNames(value); // not using SCI_LOADLEXERLIBRARY private call
if (reinit &&
(strcmp(key, LexerHomeKey) == 0 || strcmp(key, LexerNameKey) == 0))
Init();
#if NO_SCITE
else if (L && SS && sci && strncmp(key, "style.", 6) == 0) {
// The container is managing styles manually.
RECORD_STACK_TOP(L);
lua_pushlightuserdata(L, reinterpret_cast<void *>(this));
lua_setfield(L, LUA_REGISTRYINDEX, "sci_lexer_lpeg");
if (lua_rawgetp(L, LUA_REGISTRYINDEX, reinterpret_cast<void *>(this))) {
lua_getfield(L, -1, "_TOKENSTYLES");
lua_pushstring(L, key + 6);
if (lua_rawget(L, -2) == LUA_TNUMBER) {
lua_pushstring(L, key), expand_property(L);
int style_num = lua_tointeger(L, -2) - 1;
SetStyle(style_num, lua_tostring(L, -1));
if (style_num == STYLE_DEFAULT)
// Assume a theme change, with the default style being set first.
// Subsequent style settings will be based on the default.
SS(sci, SCI_STYLECLEARALL, 0, 0);
lua_pop(L, 1); // style
}
lua_pop(L, 2); // style number, _TOKENSTYLES
}
lua_pop(L, 1); // lexer object or nil
ASSERT_STACK_TOP(L);
}
#endif
return -1; // no need to re-lex
}
void * SCI_METHOD LexerLPeg::PrivateCall(int code, void *arg) {
auto lParam = reinterpret_cast<sptr_t>(arg);
switch(code) {
case SCI_GETDIRECTFUNCTION:
SS = reinterpret_cast<SciFnDirect>(lParam);
return nullptr;
case SCI_SETDOCPOINTER:
sci = lParam;
return nullptr;
case SCI_CHANGELEXERSTATE:
if (ownLua) lua_close(L);
L = reinterpret_cast<lua_State *>(arg), ownLua = false;
return nullptr;
case SCI_LOADLEXERLIBRARY: {
const char *path = reinterpret_cast<const char*>(arg);
ReadLexerNames(path);
std::string home(props.Get(LexerHomeKey));
if (!home.empty()) home.push_back(';');
home.append(path);
PropertySet(LexerHomeKey, home.c_str());
return nullptr;
} case SCI_PROPERTYNAMES: {
std::stringstream names;
for (const std::string& name : lexerNames) names << name << '\n';
return StringResult(lParam, names.str().c_str());
} case SCI_SETLEXERLANGUAGE:
if (strcmp(
props.Get(LexerNameKey),
reinterpret_cast<const char *>(arg)) != 0) {
reinit = true;
PropertySet(LexerErrorKey, "");
PropertySet(LexerNameKey, reinterpret_cast<const char *>(arg));
} else if (L && ownLua)
SetStyles();
else
Init();
return nullptr;
case SCI_GETLEXERLANGUAGE: {
std::string val("null");
if (!L) return StringResult(lParam, val.c_str());
RECORD_STACK_TOP(L);
if (lua_rawgetp(L, LUA_REGISTRYINDEX, reinterpret_cast<void *>(this))) {
lua_getfield(L, -1, "_NAME");
val = lua_tostring(L, -1);
lua_pop(L, 2); // lexer name, lexer object
} else lua_pop(L, 1); // lexer object
ASSERT_STACK_TOP(L);
if (!SS || !sci || !multilang) return StringResult(lParam, val.c_str());
val.push_back('/');
int pos = SS(sci, SCI_GETCURRENTPOS, 0, 0);
while (pos >= 0 && !ws[SS(sci, SCI_GETSTYLEAT, pos, 0)]) pos--;
if (pos >= 0) {
const char *name = NameOfStyle(SS(sci, SCI_GETSTYLEAT, pos, 0)), *p;
if (name && (p = strstr(name, "_whitespace"))) {
val.append(name, p - name);
return StringResult(lParam, val.c_str());
}
}
val.append(val, 0, val.length() - 1); // "lexer/lexer" fallback
return StringResult(lParam, val.c_str());
} case SCI_GETNAMEDSTYLES:
if (!L) return reinterpret_cast<void *>(STYLE_DEFAULT);
for (int i = 0; i < STYLE_MAX; i++)
if (strcmp(NameOfStyle(i), reinterpret_cast<const char *>(arg)) == 0)
return reinterpret_cast<void *>(i);
return reinterpret_cast<void *>(STYLE_DEFAULT);
case SCI_GETSTATUS:
return StringResult(lParam, props.Get(LexerErrorKey));
#if !NO_SCITE
default: // style-related
if (code >= -STYLE_MAX && code < 0) { // retrieve SciTE style strings
char prop_name[32];
sprintf(prop_name, "style.lpeg.%0d", code + STYLE_MAX);
return StringResult(lParam, props.Get(prop_name));
} else return nullptr;
#endif
}
return nullptr;
}
const char * SCI_METHOD LexerLPeg::NameOfStyle(int style) {
if (style < 0 || style > STYLE_MAX || !L) return nullptr;
RECORD_STACK_TOP(L);
styleName = "Not Available";
lua_rawgetp(L, LUA_REGISTRYINDEX, reinterpret_cast<void *>(this));
lua_getfield(L, -1, "_TOKENSTYLES");
for (lua_pushnil(L); lua_next(L, -2); lua_pop(L, 1))
if (lua_tointeger(L, -1) - 1 == style) {
styleName = lua_tostring(L, -2);
lua_pop(L, 2); // value and key
break;
}
lua_pop(L, 2); // _TOKENSTYLES, lexer object
ASSERT_STACK_TOP(L);
return styleName.c_str();
}
const char * SCI_METHOD LexerLPeg::PropertyGet(const char *key) {
return props.Get(key);
}
ILexer5 *LexerLPeg::LexerFactoryLPeg() { return new LexerLPeg(); }
LexerModule lmLPeg(SCLEX_LPEG, LexerLPeg::LexerFactoryLPeg, "lpeg");
#if (_WIN32 && !NO_DLL)
#define EXPORT_FUNCTION __declspec( dllexport )
#define CALLING_CONVENTION __stdcall
#else
#define EXPORT_FUNCTION __attribute__((visibility("default")))
#define CALLING_CONVENTION
#endif // _WIN32
extern "C" {
/** Returns 1, the number of lexers defined in this file. */
EXPORT_FUNCTION int CALLING_CONVENTION GetLexerCount() { return 1; }
/**
* Copies the name of the lexer into buffer *name* of size *len*.
* @param index 0, the lexer number to get the name of.
* @param name The buffer to copy the name of the lexer into.
* @param len The size of *name*.