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TIC-80-guile
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This commit is contained in:
tic 2017-11-08 17:08:12 +03:00
parent 7d52c1da99
commit 7035731624
20 changed files with 7755 additions and 8 deletions
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20
Makefile
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@ -26,12 +26,15 @@ MINGW_LINKER_FLAGS= \
LINUX_INCLUDES= \
`pkg-config --cflags gtk+-3.0`
LINUX_LIBS= \
`pkg-config --libs gtk+-3.0`
LINUX64_LIBS= \
`pkg-config --libs gtk+-3.0` \
$(LINUX_LIBS) \
-Llib/linux
LINUX32_LIBS= \
`pkg-config --libs gtk+-3.0` \
$(LINUX_LIBS) \
-Llib/linux32
LINUX_ARM_LIBS= \
@ -40,7 +43,7 @@ LINUX_ARM_LIBS= \
LINUX_LINKER_FLAGS= \
-D_GNU_SOURCE \
-lSDL2 \
-llua \
-llua5.3 \
-ldl \
-lm \
-lpthread \
@ -114,6 +117,8 @@ SOURCES=\
SOURCES_EXT= \
src/html.c
LPEG_SRC= src/ext/lpeg/*.c
DEMO_ASSETS= \
bin/assets/fire.tic.dat \
bin/assets/p3d.tic.dat \
@ -272,15 +277,18 @@ mingw: $(DEMO_ASSETS) $(TIC80_DLL) $(TIC_O) bin/html.o bin/res.o
run: mingw
$(MINGW_OUTPUT)
linux64:
linux64-flto:
$(CC) $(LINUX_INCLUDES) $(SOURCES) $(TIC80_SRC) $(SOURCES_EXT) $(OPT) $(INCLUDES) $(LINUX64_LIBS) $(LINUX_LINKER_FLAGS) -flto -o bin/tic
linux32:
linux32-flto:
$(CC) $(LINUX_INCLUDES) $(SOURCES) $(TIC80_SRC) $(SOURCES_EXT) $(OPT) $(INCLUDES) $(LINUX32_LIBS) $(LINUX_LINKER_FLAGS) -flto -o bin/tic
arm:
arm-flto:
$(CC) $(OPT_ARM) $(SOURCES) $(TIC80_SRC) $(OPT) $(INCLUDES) $(LINUX_ARM_LIBS) $(LINUX_LINKER_FLAGS) -flto -o bin/tic
linux:
$(CC) $(LINUX_INCLUDES) $(SOURCES) $(LPEG_SRC) $(SOURCES_EXT) $(TIC80_SRC) $(OPT) $(INCLUDES) $(LINUX_LIBS) $(LINUX_LINKER_FLAGS) -o bin/tic
macosx:
$(CC) $(SOURCES) $(TIC80_SRC) $(SOURCES_EXT) src/ext/file_dialog.m $(OPT) $(MACOSX_OPT) $(INCLUDES) $(MACOSX_LIBS) -o bin/tic

4
README.md
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@ -31,10 +31,10 @@ made by [@matheuslessarodrigues](https://github.com/matheuslessarodrigues)
## Linux
run the following commands in the Terminal
```
sudo apt-get install git build-essential libgtk-3-dev
sudo apt-get install git build-essential libgtk-3-dev libsdl2-dev lua5.3-dev libgif-dev lua-lpeg-dev zlib1g-dev
git clone https://github.com/nesbox/TIC-80
cd TIC-80
make linux32 (or linux64/arm depending on your system)
make linux
```
## iOS / tvOS

96
src/ext/lpeg/HISTORY Normal file
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@ -0,0 +1,96 @@
HISTORY for LPeg 1.0
* Changes from version 0.12 to 1.0
---------------------------------
+ group "names" can be any Lua value
+ some bugs fixed
+ other small improvements
* Changes from version 0.11 to 0.12
---------------------------------
+ no "unsigned short" limit for pattern sizes
+ mathtime captures considered nullable
+ some bugs fixed
* Changes from version 0.10 to 0.11
-------------------------------
+ complete reimplementation of the code generator
+ new syntax for table captures
+ new functions in module 're'
+ other small improvements
* Changes from version 0.9 to 0.10
-------------------------------
+ backtrack stack has configurable size
+ better error messages
+ Notation for non-terminals in 're' back to A instead o <A>
+ experimental look-behind pattern
+ support for external extensions
+ works with Lua 5.2
+ consumes less C stack
- "and" predicates do not keep captures
* Changes from version 0.8 to 0.9
-------------------------------
+ The accumulator capture was replaced by a fold capture;
programs that used the old 'lpeg.Ca' will need small changes.
+ Some support for character classes from old C locales.
+ A new named-group capture.
* Changes from version 0.7 to 0.8
-------------------------------
+ New "match-time" capture.
+ New "argument capture" that allows passing arguments into the pattern.
+ Better documentation for 're'.
+ Several small improvements for 're'.
+ The 're' module has an incompatibility with previous versions:
now, any use of a non-terminal must be enclosed in angle brackets
(like <B>).
* Changes from version 0.6 to 0.7
-------------------------------
+ Several improvements in module 're':
- better documentation;
- support for most captures (all but accumulator);
- limited repetitions p{n,m}.
+ Small improvements in efficiency.
+ Several small bugs corrected (special thanks to Hans Hagen
and Taco Hoekwater).
* Changes from version 0.5 to 0.6
-------------------------------
+ Support for non-numeric indices in grammars.
+ Some bug fixes (thanks to the luatex team).
+ Some new optimizations; (thanks to Mike Pall).
+ A new page layout (thanks to Andre Carregal).
+ Minimal documentation for module 're'.
* Changes from version 0.4 to 0.5
-------------------------------
+ Several optimizations.
+ lpeg.P now accepts booleans.
+ Some new examples.
+ A proper license.
+ Several small improvements.
* Changes from version 0.3 to 0.4
-------------------------------
+ Static check for loops in repetitions and grammars.
+ Removed label option in captures.
+ The implementation of captures uses less memory.
* Changes from version 0.2 to 0.3
-------------------------------
+ User-defined patterns in Lua.
+ Several new captures.
* Changes from version 0.1 to 0.2
-------------------------------
+ Several small corrections.
+ Handles embedded zeros like any other character.
+ Capture "name" can be any Lua value.
+ Unlimited number of captures.
+ Match gets an optional initial position.
(end of HISTORY)

537
src/ext/lpeg/lpcap.c Normal file
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@ -0,0 +1,537 @@
/*
** $Id: lpcap.c,v 1.6 2015/06/15 16:09:57 roberto Exp $
** Copyright 2007, Lua.org & PUC-Rio (see 'lpeg.html' for license)
*/
#include "lua.h"
#include "lauxlib.h"
#include "lpcap.h"
#include "lptypes.h"
#define captype(cap) ((cap)->kind)
#define isclosecap(cap) (captype(cap) == Cclose)
#define closeaddr(c) ((c)->s + (c)->siz - 1)
#define isfullcap(cap) ((cap)->siz != 0)
#define getfromktable(cs,v) lua_rawgeti((cs)->L, ktableidx((cs)->ptop), v)
#define pushluaval(cs) getfromktable(cs, (cs)->cap->idx)
/*
** Put at the cache for Lua values the value indexed by 'v' in ktable
** of the running pattern (if it is not there yet); returns its index.
*/
static int updatecache (CapState *cs, int v) {
int idx = cs->ptop + 1; /* stack index of cache for Lua values */
if (v != cs->valuecached) { /* not there? */
getfromktable(cs, v); /* get value from 'ktable' */
lua_replace(cs->L, idx); /* put it at reserved stack position */
cs->valuecached = v; /* keep track of what is there */
}
return idx;
}
static int pushcapture (CapState *cs);
/*
** Goes back in a list of captures looking for an open capture
** corresponding to a close
*/
static Capture *findopen (Capture *cap) {
int n = 0; /* number of closes waiting an open */
for (;;) {
cap--;
if (isclosecap(cap)) n++; /* one more open to skip */
else if (!isfullcap(cap))
if (n-- == 0) return cap;
}
}
/*
** Go to the next capture
*/
static void nextcap (CapState *cs) {
Capture *cap = cs->cap;
if (!isfullcap(cap)) { /* not a single capture? */
int n = 0; /* number of opens waiting a close */
for (;;) { /* look for corresponding close */
cap++;
if (isclosecap(cap)) {
if (n-- == 0) break;
}
else if (!isfullcap(cap)) n++;
}
}
cs->cap = cap + 1; /* + 1 to skip last close (or entire single capture) */
}
/*
** Push on the Lua stack all values generated by nested captures inside
** the current capture. Returns number of values pushed. 'addextra'
** makes it push the entire match after all captured values. The
** entire match is pushed also if there are no other nested values,
** so the function never returns zero.
*/
static int pushnestedvalues (CapState *cs, int addextra) {
Capture *co = cs->cap;
if (isfullcap(cs->cap++)) { /* no nested captures? */
lua_pushlstring(cs->L, co->s, co->siz - 1); /* push whole match */
return 1; /* that is it */
}
else {
int n = 0;
while (!isclosecap(cs->cap)) /* repeat for all nested patterns */
n += pushcapture(cs);
if (addextra || n == 0) { /* need extra? */
lua_pushlstring(cs->L, co->s, cs->cap->s - co->s); /* push whole match */
n++;
}
cs->cap++; /* skip close entry */
return n;
}
}
/*
** Push only the first value generated by nested captures
*/
static void pushonenestedvalue (CapState *cs) {
int n = pushnestedvalues(cs, 0);
if (n > 1)
lua_pop(cs->L, n - 1); /* pop extra values */
}
/*
** Try to find a named group capture with the name given at the top of
** the stack; goes backward from 'cap'.
*/
static Capture *findback (CapState *cs, Capture *cap) {
lua_State *L = cs->L;
while (cap-- > cs->ocap) { /* repeat until end of list */
if (isclosecap(cap))
cap = findopen(cap); /* skip nested captures */
else if (!isfullcap(cap))
continue; /* opening an enclosing capture: skip and get previous */
if (captype(cap) == Cgroup) {
getfromktable(cs, cap->idx); /* get group name */
if (lp_equal(L, -2, -1)) { /* right group? */
lua_pop(L, 2); /* remove reference name and group name */
return cap;
}
else lua_pop(L, 1); /* remove group name */
}
}
luaL_error(L, "back reference '%s' not found", lua_tostring(L, -1));
return NULL; /* to avoid warnings */
}
/*
** Back-reference capture. Return number of values pushed.
*/
static int backrefcap (CapState *cs) {
int n;
Capture *curr = cs->cap;
pushluaval(cs); /* reference name */
cs->cap = findback(cs, curr); /* find corresponding group */
n = pushnestedvalues(cs, 0); /* push group's values */
cs->cap = curr + 1;
return n;
}
/*
** Table capture: creates a new table and populates it with nested
** captures.
*/
static int tablecap (CapState *cs) {
lua_State *L = cs->L;
int n = 0;
lua_newtable(L);
if (isfullcap(cs->cap++))
return 1; /* table is empty */
while (!isclosecap(cs->cap)) {
if (captype(cs->cap) == Cgroup && cs->cap->idx != 0) { /* named group? */
pushluaval(cs); /* push group name */
pushonenestedvalue(cs);
lua_settable(L, -3);
}
else { /* not a named group */
int i;
int k = pushcapture(cs);
for (i = k; i > 0; i--) /* store all values into table */
lua_rawseti(L, -(i + 1), n + i);
n += k;
}
}
cs->cap++; /* skip close entry */
return 1; /* number of values pushed (only the table) */
}
/*
** Table-query capture
*/
static int querycap (CapState *cs) {
int idx = cs->cap->idx;
pushonenestedvalue(cs); /* get nested capture */
lua_gettable(cs->L, updatecache(cs, idx)); /* query cap. value at table */
if (!lua_isnil(cs->L, -1))
return 1;
else { /* no value */
lua_pop(cs->L, 1); /* remove nil */
return 0;
}
}
/*
** Fold capture
*/
static int foldcap (CapState *cs) {
int n;
lua_State *L = cs->L;
int idx = cs->cap->idx;
if (isfullcap(cs->cap++) || /* no nested captures? */
isclosecap(cs->cap) || /* no nested captures (large subject)? */
(n = pushcapture(cs)) == 0) /* nested captures with no values? */
return luaL_error(L, "no initial value for fold capture");
if (n > 1)
lua_pop(L, n - 1); /* leave only one result for accumulator */
while (!isclosecap(cs->cap)) {
lua_pushvalue(L, updatecache(cs, idx)); /* get folding function */
lua_insert(L, -2); /* put it before accumulator */
n = pushcapture(cs); /* get next capture's values */
lua_call(L, n + 1, 1); /* call folding function */
}
cs->cap++; /* skip close entry */
return 1; /* only accumulator left on the stack */
}
/*
** Function capture
*/
static int functioncap (CapState *cs) {
int n;
int top = lua_gettop(cs->L);
pushluaval(cs); /* push function */
n = pushnestedvalues(cs, 0); /* push nested captures */
lua_call(cs->L, n, LUA_MULTRET); /* call function */
return lua_gettop(cs->L) - top; /* return function's results */
}
/*
** Select capture
*/
static int numcap (CapState *cs) {
int idx = cs->cap->idx; /* value to select */
if (idx == 0) { /* no values? */
nextcap(cs); /* skip entire capture */
return 0; /* no value produced */
}
else {
int n = pushnestedvalues(cs, 0);
if (n < idx) /* invalid index? */
return luaL_error(cs->L, "no capture '%d'", idx);
else {
lua_pushvalue(cs->L, -(n - idx + 1)); /* get selected capture */
lua_replace(cs->L, -(n + 1)); /* put it in place of 1st capture */
lua_pop(cs->L, n - 1); /* remove other captures */
return 1;
}
}
}
/*
** Return the stack index of the first runtime capture in the given
** list of captures (or zero if no runtime captures)
*/
int finddyncap (Capture *cap, Capture *last) {
for (; cap < last; cap++) {
if (cap->kind == Cruntime)
return cap->idx; /* stack position of first capture */
}
return 0; /* no dynamic captures in this segment */
}
/*
** Calls a runtime capture. Returns number of captures removed by
** the call, including the initial Cgroup. (Captures to be added are
** on the Lua stack.)
*/
int runtimecap (CapState *cs, Capture *close, const char *s, int *rem) {
int n, id;
lua_State *L = cs->L;
int otop = lua_gettop(L);
Capture *open = findopen(close);
assert(captype(open) == Cgroup);
id = finddyncap(open, close); /* get first dynamic capture argument */
close->kind = Cclose; /* closes the group */
close->s = s;
cs->cap = open; cs->valuecached = 0; /* prepare capture state */
luaL_checkstack(L, 4, "too many runtime captures");
pushluaval(cs); /* push function to be called */
lua_pushvalue(L, SUBJIDX); /* push original subject */
lua_pushinteger(L, s - cs->s + 1); /* push current position */
n = pushnestedvalues(cs, 0); /* push nested captures */
lua_call(L, n + 2, LUA_MULTRET); /* call dynamic function */
if (id > 0) { /* are there old dynamic captures to be removed? */
int i;
for (i = id; i <= otop; i++)
lua_remove(L, id); /* remove old dynamic captures */
*rem = otop - id + 1; /* total number of dynamic captures removed */
}
else
*rem = 0; /* no dynamic captures removed */
return close - open; /* number of captures of all kinds removed */
}
/*
** Auxiliary structure for substitution and string captures: keep
** information about nested captures for future use, avoiding to push
** string results into Lua
*/
typedef struct StrAux {
int isstring; /* whether capture is a string */
union {
Capture *cp; /* if not a string, respective capture */
struct { /* if it is a string... */
const char *s; /* ... starts here */
const char *e; /* ... ends here */
} s;
} u;
} StrAux;
#define MAXSTRCAPS 10
/*
** Collect values from current capture into array 'cps'. Current
** capture must be Cstring (first call) or Csimple (recursive calls).
** (In first call, fills %0 with whole match for Cstring.)
** Returns number of elements in the array that were filled.
*/
static int getstrcaps (CapState *cs, StrAux *cps, int n) {
int k = n++;
cps[k].isstring = 1; /* get string value */
cps[k].u.s.s = cs->cap->s; /* starts here */
if (!isfullcap(cs->cap++)) { /* nested captures? */
while (!isclosecap(cs->cap)) { /* traverse them */
if (n >= MAXSTRCAPS) /* too many captures? */
nextcap(cs); /* skip extra captures (will not need them) */
else if (captype(cs->cap) == Csimple) /* string? */
n = getstrcaps(cs, cps, n); /* put info. into array */
else {
cps[n].isstring = 0; /* not a string */
cps[n].u.cp = cs->cap; /* keep original capture */
nextcap(cs);
n++;
}
}
cs->cap++; /* skip close */
}
cps[k].u.s.e = closeaddr(cs->cap - 1); /* ends here */
return n;
}
/*
** add next capture value (which should be a string) to buffer 'b'
*/
static int addonestring (luaL_Buffer *b, CapState *cs, const char *what);
/*
** String capture: add result to buffer 'b' (instead of pushing
** it into the stack)
*/
static void stringcap (luaL_Buffer *b, CapState *cs) {
StrAux cps[MAXSTRCAPS];
int n;
size_t len, i;
const char *fmt; /* format string */
fmt = lua_tolstring(cs->L, updatecache(cs, cs->cap->idx), &len);
n = getstrcaps(cs, cps, 0) - 1; /* collect nested captures */
for (i = 0; i < len; i++) { /* traverse them */
if (fmt[i] != '%') /* not an escape? */
luaL_addchar(b, fmt[i]); /* add it to buffer */
else if (fmt[++i] < '0' || fmt[i] > '9') /* not followed by a digit? */
luaL_addchar(b, fmt[i]); /* add to buffer */
else {
int l = fmt[i] - '0'; /* capture index */
if (l > n)
luaL_error(cs->L, "invalid capture index (%d)", l);
else if (cps[l].isstring)
luaL_addlstring(b, cps[l].u.s.s, cps[l].u.s.e - cps[l].u.s.s);
else {
Capture *curr = cs->cap;
cs->cap = cps[l].u.cp; /* go back to evaluate that nested capture */
if (!addonestring(b, cs, "capture"))
luaL_error(cs->L, "no values in capture index %d", l);
cs->cap = curr; /* continue from where it stopped */
}
}
}
}
/*
** Substitution capture: add result to buffer 'b'
*/
static void substcap (luaL_Buffer *b, CapState *cs) {
const char *curr = cs->cap->s;
if (isfullcap(cs->cap)) /* no nested captures? */
luaL_addlstring(b, curr, cs->cap->siz - 1); /* keep original text */
else {
cs->cap++; /* skip open entry */
while (!isclosecap(cs->cap)) { /* traverse nested captures */
const char *next = cs->cap->s;
luaL_addlstring(b, curr, next - curr); /* add text up to capture */
if (addonestring(b, cs, "replacement"))
curr = closeaddr(cs->cap - 1); /* continue after match */
else /* no capture value */
curr = next; /* keep original text in final result */
}
luaL_addlstring(b, curr, cs->cap->s - curr); /* add last piece of text */
}
cs->cap++; /* go to next capture */
}
/*
** Evaluates a capture and adds its first value to buffer 'b'; returns
** whether there was a value
*/
static int addonestring (luaL_Buffer *b, CapState *cs, const char *what) {
switch (captype(cs->cap)) {
case Cstring:
stringcap(b, cs); /* add capture directly to buffer */
return 1;
case Csubst:
substcap(b, cs); /* add capture directly to buffer */
return 1;
default: {
lua_State *L = cs->L;
int n = pushcapture(cs);
if (n > 0) {
if (n > 1) lua_pop(L, n - 1); /* only one result */
if (!lua_isstring(L, -1))
luaL_error(L, "invalid %s value (a %s)", what, luaL_typename(L, -1));
luaL_addvalue(b);
}
return n;
}
}
}
/*
** Push all values of the current capture into the stack; returns
** number of values pushed
*/
static int pushcapture (CapState *cs) {
lua_State *L = cs->L;
luaL_checkstack(L, 4, "too many captures");
switch (captype(cs->cap)) {
case Cposition: {
lua_pushinteger(L, cs->cap->s - cs->s + 1);
cs->cap++;
return 1;
}
case Cconst: {
pushluaval(cs);
cs->cap++;
return 1;
}
case Carg: {
int arg = (cs->cap++)->idx;
if (arg + FIXEDARGS > cs->ptop)
return luaL_error(L, "reference to absent extra argument #%d", arg);
lua_pushvalue(L, arg + FIXEDARGS);
return 1;
}
case Csimple: {
int k = pushnestedvalues(cs, 1);
lua_insert(L, -k); /* make whole match be first result */
return k;
}
case Cruntime: {
lua_pushvalue(L, (cs->cap++)->idx); /* value is in the stack */
return 1;
}
case Cstring: {
luaL_Buffer b;
luaL_buffinit(L, &b);
stringcap(&b, cs);
luaL_pushresult(&b);
return 1;
}
case Csubst: {
luaL_Buffer b;
luaL_buffinit(L, &b);
substcap(&b, cs);
luaL_pushresult(&b);
return 1;
}
case Cgroup: {
if (cs->cap->idx == 0) /* anonymous group? */
return pushnestedvalues(cs, 0); /* add all nested values */
else { /* named group: add no values */
nextcap(cs); /* skip capture */
return 0;
}
}
case Cbackref: return backrefcap(cs);
case Ctable: return tablecap(cs);
case Cfunction: return functioncap(cs);
case Cnum: return numcap(cs);
case Cquery: return querycap(cs);
case Cfold: return foldcap(cs);
default: assert(0); return 0;
}
}
/*
** Prepare a CapState structure and traverse the entire list of
** captures in the stack pushing its results. 's' is the subject
** string, 'r' is the final position of the match, and 'ptop'
** the index in the stack where some useful values were pushed.
** Returns the number of results pushed. (If the list produces no
** results, push the final position of the match.)
*/
int getcaptures (lua_State *L, const char *s, const char *r, int ptop) {
Capture *capture = (Capture *)lua_touserdata(L, caplistidx(ptop));
int n = 0;
if (!isclosecap(capture)) { /* is there any capture? */
CapState cs;
cs.ocap = cs.cap = capture; cs.L = L;
cs.s = s; cs.valuecached = 0; cs.ptop = ptop;
do { /* collect their values */
n += pushcapture(&cs);
} while (!isclosecap(cs.cap));
}
if (n == 0) { /* no capture values? */
lua_pushinteger(L, r - s + 1); /* return only end position */
n = 1;
}
return n;
}

56
src/ext/lpeg/lpcap.h Normal file
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@ -0,0 +1,56 @@
/*
** $Id: lpcap.h,v 1.3 2016/09/13 17:45:58 roberto Exp $
*/
#if !defined(lpcap_h)
#define lpcap_h
#include "lptypes.h"
/* kinds of captures */
typedef enum CapKind {
Cclose, /* not used in trees */
Cposition,
Cconst, /* ktable[key] is Lua constant */
Cbackref, /* ktable[key] is "name" of group to get capture */
Carg, /* 'key' is arg's number */
Csimple, /* next node is pattern */
Ctable, /* next node is pattern */
Cfunction, /* ktable[key] is function; next node is pattern */
Cquery, /* ktable[key] is table; next node is pattern */
Cstring, /* ktable[key] is string; next node is pattern */
Cnum, /* numbered capture; 'key' is number of value to return */
Csubst, /* substitution capture; next node is pattern */
Cfold, /* ktable[key] is function; next node is pattern */
Cruntime, /* not used in trees (is uses another type for tree) */
Cgroup /* ktable[key] is group's "name" */
} CapKind;
typedef struct Capture {
const char *s; /* subject position */
unsigned short idx; /* extra info (group name, arg index, etc.) */
byte kind; /* kind of capture */
byte siz; /* size of full capture + 1 (0 = not a full capture) */
} Capture;
typedef struct CapState {
Capture *cap; /* current capture */
Capture *ocap; /* (original) capture list */
lua_State *L;
int ptop; /* index of last argument to 'match' */
const char *s; /* original string */
int valuecached; /* value stored in cache slot */
} CapState;
int runtimecap (CapState *cs, Capture *close, const char *s, int *rem);
int getcaptures (lua_State *L, const char *s, const char *r, int ptop);
int finddyncap (Capture *cap, Capture *last);
#endif

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src/ext/lpeg/lpcode.c Normal file
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src/ext/lpeg/lpcode.h Normal file
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/*
** $Id: lpcode.h,v 1.8 2016/09/15 17:46:13 roberto Exp $
*/
#if !defined(lpcode_h)
#define lpcode_h
#include "lua.h"
#include "lptypes.h"
#include "lptree.h"
#include "lpvm.h"
int tocharset (TTree *tree, Charset *cs);
int checkaux (TTree *tree, int pred);
int fixedlen (TTree *tree);
int hascaptures (TTree *tree);
int lp_gc (lua_State *L);
Instruction *compile (lua_State *L, Pattern *p);
void realloccode (lua_State *L, Pattern *p, int nsize);
int sizei (const Instruction *i);
#define PEnullable 0
#define PEnofail 1
/*
** nofail(t) implies that 't' cannot fail with any input
*/
#define nofail(t) checkaux(t, PEnofail)
/*
** (not nullable(t)) implies 't' cannot match without consuming
** something
*/
#define nullable(t) checkaux(t, PEnullable)
#endif

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/*
** $Id: lpprint.c,v 1.10 2016/09/13 16:06:03 roberto Exp $
** Copyright 2007, Lua.org & PUC-Rio (see 'lpeg.html' for license)
*/
#include <ctype.h>
#include <limits.h>
#include <stdio.h>
#include "lptypes.h"
#include "lpprint.h"
#include "lpcode.h"
#if defined(LPEG_DEBUG)
/*
** {======================================================
** Printing patterns (for debugging)
** =======================================================
*/
void printcharset (const byte *st) {
int i;
printf("[");
for (i = 0; i <= UCHAR_MAX; i++) {
int first = i;
while (testchar(st, i) && i <= UCHAR_MAX) i++;
if (i - 1 == first) /* unary range? */
printf("(%02x)", first);
else if (i - 1 > first) /* non-empty range? */
printf("(%02x-%02x)", first, i - 1);
}
printf("]");
}
static const char *capkind (int kind) {
const char *const modes[] = {
"close", "position", "constant", "backref",
"argument", "simple", "table", "function",
"query", "string", "num", "substitution", "fold",
"runtime", "group"};
return modes[kind];
}
static void printjmp (const Instruction *op, const Instruction *p) {
printf("-> %d", (int)(p + (p + 1)->offset - op));
}
void printinst (const Instruction *op, const Instruction *p) {
const char *const names[] = {
"any", "char", "set",
"testany", "testchar", "testset",
"span", "behind",
"ret", "end",
"choice", "jmp", "call", "open_call",
"commit", "partial_commit", "back_commit", "failtwice", "fail", "giveup",
"fullcapture", "opencapture", "closecapture", "closeruntime"
};
printf("%02ld: %s ", (long)(p - op), names[p->i.code]);
switch ((Opcode)p->i.code) {
case IChar: {
printf("'%c'", p->i.aux);
break;
}
case ITestChar: {
printf("'%c'", p->i.aux); printjmp(op, p);
break;
}
case IFullCapture: {
printf("%s (size = %d) (idx = %d)",
capkind(getkind(p)), getoff(p), p->i.key);
break;
}
case IOpenCapture: {
printf("%s (idx = %d)", capkind(getkind(p)), p->i.key);
break;
}
case ISet: {
printcharset((p+1)->buff);
break;
}
case ITestSet: {
printcharset((p+2)->buff); printjmp(op, p);
break;
}
case ISpan: {
printcharset((p+1)->buff);
break;
}
case IOpenCall: {
printf("-> %d", (p + 1)->offset);
break;
}
case IBehind: {
printf("%d", p->i.aux);
break;
}
case IJmp: case ICall: case ICommit: case IChoice:
case IPartialCommit: case IBackCommit: case ITestAny: {
printjmp(op, p);
break;
}
default: break;
}
printf("\n");
}
void printpatt (Instruction *p, int n) {
Instruction *op = p;
while (p < op + n) {
printinst(op, p);
p += sizei(p);
}
}
#if defined(LPEG_DEBUG)
static void printcap (Capture *cap) {
printf("%s (idx: %d - size: %d) -> %p\n",
capkind(cap->kind), cap->idx, cap->siz, cap->s);
}
void printcaplist (Capture *cap, Capture *limit) {
printf(">======\n");
for (; cap->s && (limit == NULL || cap < limit); cap++)
printcap(cap);
printf("=======\n");
}
#endif
/* }====================================================== */
/*
** {======================================================
** Printing trees (for debugging)
** =======================================================
*/
static const char *tagnames[] = {
"char", "set", "any",
"true", "false",
"rep",
"seq", "choice",
"not", "and",
"call", "opencall", "rule", "grammar",
"behind",
"capture", "run-time"
};
void printtree (TTree *tree, int ident) {
int i;
for (i = 0; i < ident; i++) printf(" ");
printf("%s", tagnames[tree->tag]);
switch (tree->tag) {
case TChar: {
int c = tree->u.n;
if (isprint(c))
printf(" '%c'\n", c);
else
printf(" (%02X)\n", c);
break;
}
case TSet: {
printcharset(treebuffer(tree));
printf("\n");
break;
}
case TOpenCall: case TCall: {
assert(sib2(tree)->tag == TRule);
printf(" key: %d (rule: %d)\n", tree->key, sib2(tree)->cap);
break;
}
case TBehind: {
printf(" %d\n", tree->u.n);
printtree(sib1(tree), ident + 2);
break;
}
case TCapture: {
printf(" kind: '%s' key: %d\n", capkind(tree->cap), tree->key);
printtree(sib1(tree), ident + 2);
break;
}
case TRule: {
printf(" n: %d key: %d\n", tree->cap, tree->key);
printtree(sib1(tree), ident + 2);
break; /* do not print next rule as a sibling */
}
case TGrammar: {
TTree *rule = sib1(tree);
printf(" %d\n", tree->u.n); /* number of rules */
for (i = 0; i < tree->u.n; i++) {
printtree(rule, ident + 2);
rule = sib2(rule);
}
assert(rule->tag == TTrue); /* sentinel */
break;
}
default: {
int sibs = numsiblings[tree->tag];
printf("\n");
if (sibs >= 1) {
printtree(sib1(tree), ident + 2);
if (sibs >= 2)
printtree(sib2(tree), ident + 2);
}
break;
}
}
}
void printktable (lua_State *L, int idx) {
int n, i;
lua_getuservalue(L, idx);
if (lua_isnil(L, -1)) /* no ktable? */
return;
n = lua_rawlen(L, -1);
printf("[");
for (i = 1; i <= n; i++) {
printf("%d = ", i);
lua_rawgeti(L, -1, i);
if (lua_isstring(L, -1))
printf("%s ", lua_tostring(L, -1));
else
printf("%s ", lua_typename(L, lua_type(L, -1)));
lua_pop(L, 1);
}
printf("]\n");
/* leave ktable at the stack */
}
/* }====================================================== */
#endif

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/*
** $Id: lpprint.h,v 1.2 2015/06/12 18:18:08 roberto Exp $
*/
#if !defined(lpprint_h)
#define lpprint_h
#include "lptree.h"
#include "lpvm.h"
#if defined(LPEG_DEBUG)
void printpatt (Instruction *p, int n);
void printtree (TTree *tree, int ident);
void printktable (lua_State *L, int idx);
void printcharset (const byte *st);
void printcaplist (Capture *cap, Capture *limit);
void printinst (const Instruction *op, const Instruction *p);
#else
#define printktable(L,idx) \
luaL_error(L, "function only implemented in debug mode")
#define printtree(tree,i) \
luaL_error(L, "function only implemented in debug mode")
#define printpatt(p,n) \
luaL_error(L, "function only implemented in debug mode")
#endif
#endif

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/*
** $Id: lptree.h,v 1.3 2016/09/13 18:07:51 roberto Exp $
*/
#if !defined(lptree_h)
#define lptree_h
#include "lptypes.h"
/*
** types of trees
*/
typedef enum TTag {
TChar = 0, /* 'n' = char */
TSet, /* the set is stored in next CHARSETSIZE bytes */
TAny,
TTrue,
TFalse,
TRep, /* 'sib1'* */
TSeq, /* 'sib1' 'sib2' */
TChoice, /* 'sib1' / 'sib2' */
TNot, /* !'sib1' */
TAnd, /* &'sib1' */
TCall, /* ktable[key] is rule's key; 'sib2' is rule being called */
TOpenCall, /* ktable[key] is rule's key */
TRule, /* ktable[key] is rule's key (but key == 0 for unused rules);
'sib1' is rule's pattern;
'sib2' is next rule; 'cap' is rule's sequential number */
TGrammar, /* 'sib1' is initial (and first) rule */
TBehind, /* 'sib1' is pattern, 'n' is how much to go back */
TCapture, /* captures: 'cap' is kind of capture (enum 'CapKind');
ktable[key] is Lua value associated with capture;
'sib1' is capture body */
TRunTime /* run-time capture: 'key' is Lua function;
'sib1' is capture body */
} TTag;
/*
** Tree trees
** The first child of a tree (if there is one) is immediately after
** the tree. A reference to a second child (ps) is its position
** relative to the position of the tree itself.
*/
typedef struct TTree {
byte tag;
byte cap; /* kind of capture (if it is a capture) */
unsigned short key; /* key in ktable for Lua data (0 if no key) */
union {
int ps; /* occasional second child */
int n; /* occasional counter */
} u;
} TTree;
/*
** A complete pattern has its tree plus, if already compiled,
** its corresponding code
*/
typedef struct Pattern {
union Instruction *code;
int codesize;
TTree tree[1];
} Pattern;
/* number of children for each tree */
extern const byte numsiblings[];
/* access to children */
#define sib1(t) ((t) + 1)
#define sib2(t) ((t) + (t)->u.ps)
#endif

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/*
** $Id: lptypes.h,v 1.16 2017/01/13 13:33:17 roberto Exp $
** LPeg - PEG pattern matching for Lua
** Copyright 2007-2017, Lua.org & PUC-Rio (see 'lpeg.html' for license)
** written by Roberto Ierusalimschy
*/
#if !defined(lptypes_h)
#define lptypes_h
#if !defined(LPEG_DEBUG)
#define NDEBUG
#endif
#include <assert.h>
#include <limits.h>
#include "lua.h"
#define VERSION "1.0.1"
#define PATTERN_T "lpeg-pattern"
#define MAXSTACKIDX "lpeg-maxstack"
/*
** compatibility with Lua 5.1
*/
#if (LUA_VERSION_NUM == 501)
#define lp_equal lua_equal
#define lua_getuservalue lua_getfenv
#define lua_setuservalue lua_setfenv
#define lua_rawlen lua_objlen
#define luaL_setfuncs(L,f,n) luaL_register(L,NULL,f)
#define luaL_newlib(L,f) luaL_register(L,"lpeg",f)
#endif
#if !defined(lp_equal)
#define lp_equal(L,idx1,idx2) lua_compare(L,(idx1),(idx2),LUA_OPEQ)
#endif
/* default maximum size for call/backtrack stack */
#if !defined(MAXBACK)
#define MAXBACK 400
#endif
/* maximum number of rules in a grammar (limited by 'unsigned char') */
#if !defined(MAXRULES)
#define MAXRULES 250
#endif
/* initial size for capture's list */
#define INITCAPSIZE 32
/* index, on Lua stack, for subject */
#define SUBJIDX 2
/* number of fixed arguments to 'match' (before capture arguments) */
#define FIXEDARGS 3
/* index, on Lua stack, for capture list */
#define caplistidx(ptop) ((ptop) + 2)
/* index, on Lua stack, for pattern's ktable */
#define ktableidx(ptop) ((ptop) + 3)
/* index, on Lua stack, for backtracking stack */
#define stackidx(ptop) ((ptop) + 4)
typedef unsigned char byte;
#define BITSPERCHAR 8
#define CHARSETSIZE ((UCHAR_MAX/BITSPERCHAR) + 1)
typedef struct Charset {
byte cs[CHARSETSIZE];
} Charset;
#define loopset(v,b) { int v; for (v = 0; v < CHARSETSIZE; v++) {b;} }
/* access to charset */
#define treebuffer(t) ((byte *)((t) + 1))
/* number of slots needed for 'n' bytes */
#define bytes2slots(n) (((n) - 1) / sizeof(TTree) + 1)
/* set 'b' bit in charset 'cs' */
#define setchar(cs,b) ((cs)[(b) >> 3] |= (1 << ((b) & 7)))
/*
** in capture instructions, 'kind' of capture and its offset are
** packed in field 'aux', 4 bits for each
*/
#define getkind(op) ((op)->i.aux & 0xF)
#define getoff(op) (((op)->i.aux >> 4) & 0xF)
#define joinkindoff(k,o) ((k) | ((o) << 4))
#define MAXOFF 0xF
#define MAXAUX 0xFF
/* maximum number of bytes to look behind */
#define MAXBEHIND MAXAUX
/* maximum size (in elements) for a pattern */
#define MAXPATTSIZE (SHRT_MAX - 10)
/* size (in elements) for an instruction plus extra l bytes */
#define instsize(l) (((l) + sizeof(Instruction) - 1)/sizeof(Instruction) + 1)
/* size (in elements) for a ISet instruction */
#define CHARSETINSTSIZE instsize(CHARSETSIZE)
/* size (in elements) for a IFunc instruction */
#define funcinstsize(p) ((p)->i.aux + 2)
#define testchar(st,c) (((int)(st)[((c) >> 3)] & (1 << ((c) & 7))))
#endif

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/*
** $Id: lpvm.c,v 1.9 2016/06/03 20:11:18 roberto Exp $
** Copyright 2007, Lua.org & PUC-Rio (see 'lpeg.html' for license)
*/
#include <limits.h>
#include <string.h>
#include "lua.h"
#include "lauxlib.h"
#include "lpcap.h"
#include "lptypes.h"
#include "lpvm.h"
#include "lpprint.h"
/* initial size for call/backtrack stack */
#if !defined(INITBACK)
#define INITBACK MAXBACK
#endif
#define getoffset(p) (((p) + 1)->offset)
static const Instruction giveup = {{IGiveup, 0, 0}};
/*
** {======================================================
** Virtual Machine
** =======================================================
*/
typedef struct Stack {
const char *s; /* saved position (or NULL for calls) */
const Instruction *p; /* next instruction */
int caplevel;
} Stack;
#define getstackbase(L, ptop) ((Stack *)lua_touserdata(L, stackidx(ptop)))
/*
** Make the size of the array of captures 'cap' twice as large as needed
** (which is 'captop'). ('n' is the number of new elements.)
*/
static Capture *doublecap (lua_State *L, Capture *cap, int captop,
int n, int ptop) {
Capture *newc;
if (captop >= INT_MAX/((int)sizeof(Capture) * 2))
luaL_error(L, "too many captures");
newc = (Capture *)lua_newuserdata(L, captop * 2 * sizeof(Capture));
memcpy(newc, cap, (captop - n) * sizeof(Capture));
lua_replace(L, caplistidx(ptop));
return newc;
}
/*
** Double the size of the stack
*/
static Stack *doublestack (lua_State *L, Stack **stacklimit, int ptop) {
Stack *stack = getstackbase(L, ptop);
Stack *newstack;
int n = *stacklimit - stack; /* current stack size */
int max, newn;
lua_getfield(L, LUA_REGISTRYINDEX, MAXSTACKIDX);
max = lua_tointeger(L, -1); /* maximum allowed size */
lua_pop(L, 1);
if (n >= max) /* already at maximum size? */
luaL_error(L, "backtrack stack overflow (current limit is %d)", max);
newn = 2 * n; /* new size */
if (newn > max) newn = max;
newstack = (Stack *)lua_newuserdata(L, newn * sizeof(Stack));
memcpy(newstack, stack, n * sizeof(Stack));
lua_replace(L, stackidx(ptop));
*stacklimit = newstack + newn;
return newstack + n; /* return next position */
}
/*
** Interpret the result of a dynamic capture: false -> fail;
** true -> keep current position; number -> next position.
** Return new subject position. 'fr' is stack index where
** is the result; 'curr' is current subject position; 'limit'
** is subject's size.
*/
static int resdyncaptures (lua_State *L, int fr, int curr, int limit) {
lua_Integer res;
if (!lua_toboolean(L, fr)) { /* false value? */
lua_settop(L, fr - 1); /* remove results */
return -1; /* and fail */
}
else if (lua_isboolean(L, fr)) /* true? */
res = curr; /* keep current position */
else {
res = lua_tointeger(L, fr) - 1; /* new position */
if (res < curr || res > limit)
luaL_error(L, "invalid position returned by match-time capture");
}
lua_remove(L, fr); /* remove first result (offset) */
return res;
}
/*
** Add capture values returned by a dynamic capture to the capture list
** 'base', nested inside a group capture. 'fd' indexes the first capture
** value, 'n' is the number of values (at least 1).
*/
static void adddyncaptures (const char *s, Capture *base, int n, int fd) {
int i;
base[0].kind = Cgroup; /* create group capture */
base[0].siz = 0;
base[0].idx = 0; /* make it an anonymous group */
for (i = 1; i <= n; i++) { /* add runtime captures */
base[i].kind = Cruntime;
base[i].siz = 1; /* mark it as closed */
base[i].idx = fd + i - 1; /* stack index of capture value */
base[i].s = s;
}
base[i].kind = Cclose; /* close group */
base[i].siz = 1;
base[i].s = s;
}
/*
** Remove dynamic captures from the Lua stack (called in case of failure)
*/
static int removedyncap (lua_State *L, Capture *capture,
int level, int last) {
int id = finddyncap(capture + level, capture + last); /* index of 1st cap. */
int top = lua_gettop(L);
if (id == 0) return 0; /* no dynamic captures? */
lua_settop(L, id - 1); /* remove captures */
return top - id + 1; /* number of values removed */
}
/*
** Opcode interpreter
*/
const char *match (lua_State *L, const char *o, const char *s, const char *e,
Instruction *op, Capture *capture, int ptop) {
Stack stackbase[INITBACK];
Stack *stacklimit = stackbase + INITBACK;
Stack *stack = stackbase; /* point to first empty slot in stack */
int capsize = INITCAPSIZE;
int captop = 0; /* point to first empty slot in captures */
int ndyncap = 0; /* number of dynamic captures (in Lua stack) */
const Instruction *p = op; /* current instruction */
stack->p = &giveup; stack->s = s; stack->caplevel = 0; stack++;
lua_pushlightuserdata(L, stackbase);
for (;;) {
#if defined(DEBUG)
printf("-------------------------------------\n");
printcaplist(capture, capture + captop);
printf("s: |%s| stck:%d, dyncaps:%d, caps:%d ",
s, (int)(stack - getstackbase(L, ptop)), ndyncap, captop);
printinst(op, p);
#endif
assert(stackidx(ptop) + ndyncap == lua_gettop(L) && ndyncap <= captop);
switch ((Opcode)p->i.code) {
case IEnd: {
assert(stack == getstackbase(L, ptop) + 1);
capture[captop].kind = Cclose;
capture[captop].s = NULL;
return s;
}
case IGiveup: {
assert(stack == getstackbase(L, ptop));
return NULL;
}
case IRet: {
assert(stack > getstackbase(L, ptop) && (stack - 1)->s == NULL);
p = (--stack)->p;
continue;
}
case IAny: {
if (s < e) { p++; s++; }
else goto fail;
continue;
}
case ITestAny: {
if (s < e) p += 2;
else p += getoffset(p);
continue;
}
case IChar: {
if ((byte)*s == p->i.aux && s < e) { p++; s++; }
else goto fail;
continue;
}
case ITestChar: {
if ((byte)*s == p->i.aux && s < e) p += 2;
else p += getoffset(p);
continue;
}
case ISet: {
int c = (byte)*s;
if (testchar((p+1)->buff, c) && s < e)
{ p += CHARSETINSTSIZE; s++; }
else goto fail;
continue;
}
case ITestSet: {
int c = (byte)*s;
if (testchar((p + 2)->buff, c) && s < e)
p += 1 + CHARSETINSTSIZE;
else p += getoffset(p);
continue;
}
case IBehind: {
int n = p->i.aux;
if (n > s - o) goto fail;
s -= n; p++;
continue;
}
case ISpan: {
for (; s < e; s++) {
int c = (byte)*s;
if (!testchar((p+1)->buff, c)) break;
}
p += CHARSETINSTSIZE;
continue;
}
case IJmp: {
p += getoffset(p);
continue;
}
case IChoice: {
if (stack == stacklimit)
stack = doublestack(L, &stacklimit, ptop);
stack->p = p + getoffset(p);
stack->s = s;
stack->caplevel = captop;
stack++;
p += 2;
continue;
}
case ICall: {
if (stack == stacklimit)
stack = doublestack(L, &stacklimit, ptop);
stack->s = NULL;
stack->p = p + 2; /* save return address */
stack++;
p += getoffset(p);
continue;
}
case ICommit: {
assert(stack > getstackbase(L, ptop) && (stack - 1)->s != NULL);
stack--;
p += getoffset(p);
continue;
}
case IPartialCommit: {
assert(stack > getstackbase(L, ptop) && (stack - 1)->s != NULL);
(stack - 1)->s = s;
(stack - 1)->caplevel = captop;
p += getoffset(p);
continue;
}
case IBackCommit: {
assert(stack > getstackbase(L, ptop) && (stack - 1)->s != NULL);
s = (--stack)->s;
captop = stack->caplevel;
p += getoffset(p);
continue;
}
case IFailTwice:
assert(stack > getstackbase(L, ptop));
stack--;
/* go through */
case IFail:
fail: { /* pattern failed: try to backtrack */
do { /* remove pending calls */
assert(stack > getstackbase(L, ptop));
s = (--stack)->s;
} while (s == NULL);
if (ndyncap > 0) /* is there matchtime captures? */
ndyncap -= removedyncap(L, capture, stack->caplevel, captop);
captop = stack->caplevel;
p = stack->p;
#if defined(DEBUG)
printf("**FAIL**\n");
#endif
continue;
}
case ICloseRunTime: {
CapState cs;
int rem, res, n;
int fr = lua_gettop(L) + 1; /* stack index of first result */
cs.s = o; cs.L = L; cs.ocap = capture; cs.ptop = ptop;
n = runtimecap(&cs, capture + captop, s, &rem); /* call function */
captop -= n; /* remove nested captures */
ndyncap -= rem; /* update number of dynamic captures */
fr -= rem; /* 'rem' items were popped from Lua stack */
res = resdyncaptures(L, fr, s - o, e - o); /* get result */
if (res == -1) /* fail? */
goto fail;
s = o + res; /* else update current position */
n = lua_gettop(L) - fr + 1; /* number of new captures */
ndyncap += n; /* update number of dynamic captures */
if (n > 0) { /* any new capture? */
if (fr + n >= SHRT_MAX)
luaL_error(L, "too many results in match-time capture");
if ((captop += n + 2) >= capsize) {
capture = doublecap(L, capture, captop, n + 2, ptop);
capsize = 2 * captop;
}
/* add new captures to 'capture' list */
adddyncaptures(s, capture + captop - n - 2, n, fr);
}
p++;
continue;
}
case ICloseCapture: {
const char *s1 = s;
assert(captop > 0);
/* if possible, turn capture into a full capture */
if (capture[captop - 1].siz == 0 &&
s1 - capture[captop - 1].s < UCHAR_MAX) {
capture[captop - 1].siz = s1 - capture[captop - 1].s + 1;
p++;
continue;
}
else {
capture[captop].siz = 1; /* mark entry as closed */
capture[captop].s = s;
goto pushcapture;
}
}
case IOpenCapture:
capture[captop].siz = 0; /* mark entry as open */
capture[captop].s = s;
goto pushcapture;
case IFullCapture:
capture[captop].siz = getoff(p) + 1; /* save capture size */
capture[captop].s = s - getoff(p);
/* goto pushcapture; */
pushcapture: {
capture[captop].idx = p->i.key;
capture[captop].kind = getkind(p);
if (++captop >= capsize) {
capture = doublecap(L, capture, captop, 0, ptop);
capsize = 2 * captop;
}
p++;
continue;
}
default: assert(0); return NULL;
}
}
}
/* }====================================================== */

58
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/*
** $Id: lpvm.h,v 1.3 2014/02/21 13:06:41 roberto Exp $
*/
#if !defined(lpvm_h)
#define lpvm_h
#include "lpcap.h"
/* Virtual Machine's instructions */
typedef enum Opcode {
IAny, /* if no char, fail */
IChar, /* if char != aux, fail */
ISet, /* if char not in buff, fail */
ITestAny, /* in no char, jump to 'offset' */
ITestChar, /* if char != aux, jump to 'offset' */
ITestSet, /* if char not in buff, jump to 'offset' */
ISpan, /* read a span of chars in buff */
IBehind, /* walk back 'aux' characters (fail if not possible) */
IRet, /* return from a rule */
IEnd, /* end of pattern */
IChoice, /* stack a choice; next fail will jump to 'offset' */
IJmp, /* jump to 'offset' */
ICall, /* call rule at 'offset' */
IOpenCall, /* call rule number 'key' (must be closed to a ICall) */
ICommit, /* pop choice and jump to 'offset' */
IPartialCommit, /* update top choice to current position and jump */
IBackCommit, /* "fails" but jump to its own 'offset' */
IFailTwice, /* pop one choice and then fail */
IFail, /* go back to saved state on choice and jump to saved offset */
IGiveup, /* internal use */
IFullCapture, /* complete capture of last 'off' chars */
IOpenCapture, /* start a capture */
ICloseCapture,
ICloseRunTime
} Opcode;
typedef union Instruction {
struct Inst {
byte code;
byte aux;
short key;
} i;
int offset;
byte buff[1];
} Instruction;
void printpatt (Instruction *p, int n);
const char *match (lua_State *L, const char *o, const char *s, const char *e,
Instruction *op, Capture *capture, int ptop);
#endif

55
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LIBNAME = lpeg
LUADIR = ../lua/
COPT = -O2
# COPT = -DLPEG_DEBUG -g
CWARNS = -Wall -Wextra -pedantic \
-Waggregate-return \
-Wcast-align \
-Wcast-qual \
-Wdisabled-optimization \
-Wpointer-arith \
-Wshadow \
-Wsign-compare \
-Wundef \
-Wwrite-strings \
-Wbad-function-cast \
-Wdeclaration-after-statement \
-Wmissing-prototypes \
-Wnested-externs \
-Wstrict-prototypes \
# -Wunreachable-code \
CFLAGS = $(CWARNS) $(COPT) -std=c99 -I$(LUADIR) -fPIC
CC = gcc
FILES = lpvm.o lpcap.o lptree.o lpcode.o lpprint.o
# For Linux
linux:
make lpeg.so "DLLFLAGS = -shared -fPIC"
# For Mac OS
macosx:
make lpeg.so "DLLFLAGS = -bundle -undefined dynamic_lookup"
lpeg.so: $(FILES)
env $(CC) $(DLLFLAGS) $(FILES) -o lpeg.so
$(FILES): makefile
test: test.lua re.lua lpeg.so
./test.lua
clean:
rm -f $(FILES) lpeg.so
lpcap.o: lpcap.c lpcap.h lptypes.h
lpcode.o: lpcode.c lptypes.h lpcode.h lptree.h lpvm.h lpcap.h
lpprint.o: lpprint.c lptypes.h lpprint.h lptree.h lpvm.h lpcap.h
lptree.o: lptree.c lptypes.h lpcap.h lpcode.h lptree.h lpvm.h lpprint.h
lpvm.o: lpvm.c lpcap.h lptypes.h lpvm.h lpprint.h lptree.h

498
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<title>LPeg.re - Regex syntax for LPEG</title>
<link rel="stylesheet"
href="http://www.inf.puc-rio.br/~roberto/lpeg/doc.css"
type="text/css"/>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
</head>
<body>
<!-- $Id: re.html,v 1.24 2016/09/20 17:41:27 roberto Exp $ -->
<div id="container">
<div id="product">
<div id="product_logo">
<a href="http://www.inf.puc-rio.br/~roberto/lpeg/">
<img alt="LPeg logo" src="lpeg-128.gif"/>
</a>
</div>
<div id="product_name"><big><strong>LPeg.re</strong></big></div>
<div id="product_description">
Regex syntax for LPEG
</div>
</div> <!-- id="product" -->
<div id="main">
<div id="navigation">
<h1>re</h1>
<ul>
<li><a href="#basic">Basic Constructions</a></li>
<li><a href="#func">Functions</a></li>
<li><a href="#ex">Some Examples</a></li>
<li><a href="#license">License</a></li>
</ul>
</li>
</ul>
</div> <!-- id="navigation" -->
<div id="content">
<h2><a name="basic"></a>The <code>re</code> Module</h2>
<p>
The <code>re</code> module
(provided by file <code>re.lua</code> in the distribution)
supports a somewhat conventional regex syntax
for pattern usage within <a href="lpeg.html">LPeg</a>.
</p>
<p>
The next table summarizes <code>re</code>'s syntax.
A <code>p</code> represents an arbitrary pattern;
<code>num</code> represents a number (<code>[0-9]+</code>);
<code>name</code> represents an identifier
(<code>[a-zA-Z][a-zA-Z0-9_]*</code>).
Constructions are listed in order of decreasing precedence.
<table border="1">
<tbody><tr><td><b>Syntax</b></td><td><b>Description</b></td></tr>
<tr><td><code>( p )</code></td> <td>grouping</td></tr>
<tr><td><code>'string'</code></td> <td>literal string</td></tr>
<tr><td><code>"string"</code></td> <td>literal string</td></tr>
<tr><td><code>[class]</code></td> <td>character class</td></tr>
<tr><td><code>.</code></td> <td>any character</td></tr>
<tr><td><code>%name</code></td>
<td>pattern <code>defs[name]</code> or a pre-defined pattern</td></tr>
<tr><td><code>name</code></td><td>non terminal</td></tr>
<tr><td><code>&lt;name&gt;</code></td><td>non terminal</td></tr>
<tr><td><code>{}</code></td> <td>position capture</td></tr>
<tr><td><code>{ p }</code></td> <td>simple capture</td></tr>
<tr><td><code>{: p :}</code></td> <td>anonymous group capture</td></tr>
<tr><td><code>{:name: p :}</code></td> <td>named group capture</td></tr>
<tr><td><code>{~ p ~}</code></td> <td>substitution capture</td></tr>
<tr><td><code>{| p |}</code></td> <td>table capture</td></tr>
<tr><td><code>=name</code></td> <td>back reference
</td></tr>
<tr><td><code>p ?</code></td> <td>optional match</td></tr>
<tr><td><code>p *</code></td> <td>zero or more repetitions</td></tr>
<tr><td><code>p +</code></td> <td>one or more repetitions</td></tr>
<tr><td><code>p^num</code></td> <td>exactly <code>n</code> repetitions</td></tr>
<tr><td><code>p^+num</code></td>
<td>at least <code>n</code> repetitions</td></tr>
<tr><td><code>p^-num</code></td>
<td>at most <code>n</code> repetitions</td></tr>
<tr><td><code>p -&gt; 'string'</code></td> <td>string capture</td></tr>
<tr><td><code>p -&gt; "string"</code></td> <td>string capture</td></tr>
<tr><td><code>p -&gt; num</code></td> <td>numbered capture</td></tr>
<tr><td><code>p -&gt; name</code></td> <td>function/query/string capture
equivalent to <code>p / defs[name]</code></td></tr>
<tr><td><code>p =&gt; name</code></td> <td>match-time capture
equivalent to <code>lpeg.Cmt(p, defs[name])</code></td></tr>
<tr><td><code>& p</code></td> <td>and predicate</td></tr>
<tr><td><code>! p</code></td> <td>not predicate</td></tr>
<tr><td><code>p1 p2</code></td> <td>concatenation</td></tr>
<tr><td><code>p1 / p2</code></td> <td>ordered choice</td></tr>
<tr><td>(<code>name &lt;- p</code>)<sup>+</sup></td> <td>grammar</td></tr>
</tbody></table>
<p>
Any space appearing in a syntax description can be
replaced by zero or more space characters and Lua-style comments
(<code>--</code> until end of line).
</p>
<p>
Character classes define sets of characters.
An initial <code>^</code> complements the resulting set.
A range <em>x</em><code>-</code><em>y</em> includes in the set
all characters with codes between the codes of <em>x</em> and <em>y</em>.
A pre-defined class <code>%</code><em>name</em> includes all
characters of that class.
A simple character includes itself in the set.
The only special characters inside a class are <code>^</code>
(special only if it is the first character);
<code>]</code>
(can be included in the set as the first character,
after the optional <code>^</code>);
<code>%</code> (special only if followed by a letter);
and <code>-</code>
(can be included in the set as the first or the last character).
</p>
<p>
Currently the pre-defined classes are similar to those from the
Lua's string library
(<code>%a</code> for letters,
<code>%A</code> for non letters, etc.).
There is also a class <code>%nl</code>
containing only the newline character,
which is particularly handy for grammars written inside long strings,
as long strings do not interpret escape sequences like <code>\n</code>.
</p>
<h2><a name="func">Functions</a></h2>
<h3><code>re.compile (string, [, defs])</code></h3>
<p>
Compiles the given string and
returns an equivalent LPeg pattern.
The given string may define either an expression or a grammar.
The optional <code>defs</code> table provides extra Lua values
to be used by the pattern.
</p>
<h3><code>re.find (subject, pattern [, init])</code></h3>
<p>
Searches the given pattern in the given subject.
If it finds a match,
returns the index where this occurrence starts and
the index where it ends.
Otherwise, returns nil.
</p>
<p>
An optional numeric argument <code>init</code> makes the search
starts at that position in the subject string.
As usual in Lua libraries,
a negative value counts from the end.
</p>
<h3><code>re.gsub (subject, pattern, replacement)</code></h3>
<p>
Does a <em>global substitution</em>,
replacing all occurrences of <code>pattern</code>
in the given <code>subject</code> by <code>replacement</code>.
<h3><code>re.match (subject, pattern)</code></h3>
<p>
Matches the given pattern against the given subject,
returning all captures.
</p>
<h3><code>re.updatelocale ()</code></h3>
<p>
Updates the pre-defined character classes to the current locale.
</p>
<h2><a name="ex">Some Examples</a></h2>
<h3>A complete simple program</h3>
<p>
The next code shows a simple complete Lua program using
the <code>re</code> module:
</p>
<pre class="example">
local re = require"re"
-- find the position of the first numeral in a string
print(re.find("the number 423 is odd", "[0-9]+")) --&gt; 12 14
-- returns all words in a string
print(re.match("the number 423 is odd", "({%a+} / .)*"))
--&gt; the number is odd
-- returns the first numeral in a string
print(re.match("the number 423 is odd", "s <- {%d+} / . s"))
--&gt; 423
print(re.gsub("hello World", "[aeiou]", "."))
--&gt; h.ll. W.rld
</pre>
<h3>Balanced parentheses</h3>
<p>
The following call will produce the same pattern produced by the
Lua expression in the
<a href="lpeg.html#balanced">balanced parentheses</a> example:
</p>
<pre class="example">
b = re.compile[[ balanced &lt;- "(" ([^()] / balanced)* ")" ]]
</pre>
<h3>String reversal</h3>
<p>
The next example reverses a string:
</p>
<pre class="example">
rev = re.compile[[ R &lt;- (!.) -&gt; '' / ({.} R) -&gt; '%2%1']]
print(rev:match"0123456789") --&gt; 9876543210
</pre>
<h3>CSV decoder</h3>
<p>
The next example replicates the <a href="lpeg.html#CSV">CSV decoder</a>:
</p>
<pre class="example">
record = re.compile[[
record &lt;- {| field (',' field)* |} (%nl / !.)
field &lt;- escaped / nonescaped
nonescaped &lt;- { [^,"%nl]* }
escaped &lt;- '"' {~ ([^"] / '""' -&gt; '"')* ~} '"'
]]
</pre>
<h3>Lua's long strings</h3>
<p>
The next example matches Lua long strings:
</p>
<pre class="example">
c = re.compile([[
longstring &lt;- ('[' {:eq: '='* :} '[' close)
close &lt;- ']' =eq ']' / . close
]])
print(c:match'[==[]]===]]]]==]===[]') --&gt; 17
</pre>
<h3>Abstract Syntax Trees</h3>
<p>
This example shows a simple way to build an
abstract syntax tree (AST) for a given grammar.
To keep our example simple,
let us consider the following grammar
for lists of names:
</p>
<pre class="example">
p = re.compile[[
listname &lt;- (name s)*
name &lt;- [a-z][a-z]*
s &lt;- %s*
]]
</pre>
<p>
Now, we will add captures to build a corresponding AST.
As a first step, the pattern will build a table to
represent each non terminal;
terminals will be represented by their corresponding strings:
</p>
<pre class="example">
c = re.compile[[
listname &lt;- {| (name s)* |}
name &lt;- {| {[a-z][a-z]*} |}
s &lt;- %s*
]]
</pre>
<p>
Now, a match against <code>"hi hello bye"</code>
results in the table
<code>{{"hi"}, {"hello"}, {"bye"}}</code>.
</p>
<p>
For such a simple grammar,
this AST is more than enough;
actually, the tables around each single name
are already overkilling.
More complex grammars,
however, may need some more structure.
Specifically,
it would be useful if each table had
a <code>tag</code> field telling what non terminal
that table represents.
We can add such a tag using
<a href="lpeg.html#cap-g">named group captures</a>:
</p>
<pre class="example">
x = re.compile[[
listname <- {| {:tag: '' -> 'list':} (name s)* |}
name <- {| {:tag: '' -> 'id':} {[a-z][a-z]*} |}
s <- ' '*
]]
</pre>
<p>
With these group captures,
a match against <code>"hi hello bye"</code>
results in the following table:
</p>
<pre class="example">
{tag="list",
{tag="id", "hi"},
{tag="id", "hello"},
{tag="id", "bye"}
}
</pre>
<h3>Indented blocks</h3>
<p>
This example breaks indented blocks into tables,
respecting the indentation:
</p>
<pre class="example">
p = re.compile[[
block &lt;- {| {:ident:' '*:} line
((=ident !' ' line) / &(=ident ' ') block)* |}
line &lt;- {[^%nl]*} %nl
]]
</pre>
<p>
As an example,
consider the following text:
</p>
<pre class="example">
t = p:match[[
first line
subline 1
subline 2
second line
third line
subline 3.1
subline 3.1.1
subline 3.2
]]
</pre>
<p>
The resulting table <code>t</code> will be like this:
</p>
<pre class="example">
{'first line'; {'subline 1'; 'subline 2'; ident = ' '};
'second line';
'third line'; { 'subline 3.1'; {'subline 3.1.1'; ident = ' '};
'subline 3.2'; ident = ' '};
ident = ''}
</pre>
<h3>Macro expander</h3>
<p>
This example implements a simple macro expander.
Macros must be defined as part of the pattern,
following some simple rules:
</p>
<pre class="example">
p = re.compile[[
text &lt;- {~ item* ~}
item &lt;- macro / [^()] / '(' item* ')'
arg &lt;- ' '* {~ (!',' item)* ~}
args &lt;- '(' arg (',' arg)* ')'
-- now we define some macros
macro &lt;- ('apply' args) -&gt; '%1(%2)'
/ ('add' args) -&gt; '%1 + %2'
/ ('mul' args) -&gt; '%1 * %2'
]]
print(p:match"add(mul(a,b), apply(f,x))") --&gt; a * b + f(x)
</pre>
<p>
A <code>text</code> is a sequence of items,
wherein we apply a substitution capture to expand any macros.
An <code>item</code> is either a macro,
any character different from parentheses,
or a parenthesized expression.
A macro argument (<code>arg</code>) is a sequence
of items different from a comma.
(Note that a comma may appear inside an item,
e.g., inside a parenthesized expression.)
Again we do a substitution capture to expand any macro
in the argument before expanding the outer macro.
<code>args</code> is a list of arguments separated by commas.
Finally we define the macros.
Each macro is a string substitution;
it replaces the macro name and its arguments by its corresponding string,
with each <code>%</code><em>n</em> replaced by the <em>n</em>-th argument.
</p>
<h3>Patterns</h3>
<p>
This example shows the complete syntax
of patterns accepted by <code>re</code>.
</p>
<pre class="example">
p = [=[
pattern &lt;- exp !.
exp &lt;- S (grammar / alternative)
alternative &lt;- seq ('/' S seq)*
seq &lt;- prefix*
prefix &lt;- '&amp;' S prefix / '!' S prefix / suffix
suffix &lt;- primary S (([+*?]
/ '^' [+-]? num
/ '-&gt;' S (string / '{}' / name)
/ '=&gt;' S name) S)*
primary &lt;- '(' exp ')' / string / class / defined
/ '{:' (name ':')? exp ':}'
/ '=' name
/ '{}'
/ '{~' exp '~}'
/ '{' exp '}'
/ '.'
/ name S !arrow
/ '&lt;' name '&gt;' -- old-style non terminals
grammar &lt;- definition+
definition &lt;- name S arrow exp
class &lt;- '[' '^'? item (!']' item)* ']'
item &lt;- defined / range / .
range &lt;- . '-' [^]]
S &lt;- (%s / '--' [^%nl]*)* -- spaces and comments
name &lt;- [A-Za-z][A-Za-z0-9_]*
arrow &lt;- '&lt;-'
num &lt;- [0-9]+
string &lt;- '"' [^"]* '"' / "'" [^']* "'"
defined &lt;- '%' name
]=]
print(re.match(p, p)) -- a self description must match itself
</pre>
<h2><a name="license">License</a></h2>
<p>
Copyright &copy; 2008-2015 Lua.org, PUC-Rio.
</p>
<p>
Permission is hereby granted, free of charge,
to any person obtaining a copy of this software and
associated documentation files (the "Software"),
to deal in the Software without restriction,
including without limitation the rights to use,
copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software,
and to permit persons to whom the Software is
furnished to do so,
subject to the following conditions:
</p>
<p>
The above copyright notice and this permission notice
shall be included in all copies or substantial portions of the Software.
</p>
<p>
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED,
INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
</p>
</div> <!-- id="content" -->
</div> <!-- id="main" -->
<div id="about">
<p><small>
$Id: re.html,v 1.24 2016/09/20 17:41:27 roberto Exp $
</small></p>
</div> <!-- id="about" -->
</div> <!-- id="container" -->
</body>
</html>

259
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-- $Id: re.lua,v 1.44 2013/03/26 20:11:40 roberto Exp $
-- imported functions and modules
local tonumber, type, print, error = tonumber, type, print, error
local setmetatable = setmetatable
local m = require"lpeg"
-- 'm' will be used to parse expressions, and 'mm' will be used to
-- create expressions; that is, 're' runs on 'm', creating patterns
-- on 'mm'
local mm = m
-- pattern's metatable
local mt = getmetatable(mm.P(0))
-- No more global accesses after this point
local version = _VERSION
if version == "Lua 5.2" then _ENV = nil end
local any = m.P(1)
-- Pre-defined names
local Predef = { nl = m.P"\n" }
local mem
local fmem
local gmem
local function updatelocale ()
mm.locale(Predef)
Predef.a = Predef.alpha
Predef.c = Predef.cntrl
Predef.d = Predef.digit
Predef.g = Predef.graph
Predef.l = Predef.lower
Predef.p = Predef.punct
Predef.s = Predef.space
Predef.u = Predef.upper
Predef.w = Predef.alnum
Predef.x = Predef.xdigit
Predef.A = any - Predef.a
Predef.C = any - Predef.c
Predef.D = any - Predef.d
Predef.G = any - Predef.g
Predef.L = any - Predef.l
Predef.P = any - Predef.p
Predef.S = any - Predef.s
Predef.U = any - Predef.u
Predef.W = any - Predef.w
Predef.X = any - Predef.x
mem = {} -- restart memoization
fmem = {}
gmem = {}
local mt = {__mode = "v"}
setmetatable(mem, mt)
setmetatable(fmem, mt)
setmetatable(gmem, mt)
end
updatelocale()
local I = m.P(function (s,i) print(i, s:sub(1, i-1)); return i end)
local function getdef (id, defs)
local c = defs and defs[id]
if not c then error("undefined name: " .. id) end
return c
end
local function patt_error (s, i)
local msg = (#s < i + 20) and s:sub(i)
or s:sub(i,i+20) .. "..."
msg = ("pattern error near '%s'"):format(msg)
error(msg, 2)
end
local function mult (p, n)
local np = mm.P(true)
while n >= 1 do
if n%2 >= 1 then np = np * p end
p = p * p
n = n/2
end
return np
end
local function equalcap (s, i, c)
if type(c) ~= "string" then return nil end
local e = #c + i
if s:sub(i, e - 1) == c then return e else return nil end
end
local S = (Predef.space + "--" * (any - Predef.nl)^0)^0
local name = m.R("AZ", "az", "__") * m.R("AZ", "az", "__", "09")^0
local arrow = S * "<-"
local seq_follow = m.P"/" + ")" + "}" + ":}" + "~}" + "|}" + (name * arrow) + -1
name = m.C(name)
-- a defined name only have meaning in a given environment
local Def = name * m.Carg(1)
local num = m.C(m.R"09"^1) * S / tonumber
local String = "'" * m.C((any - "'")^0) * "'" +
'"' * m.C((any - '"')^0) * '"'
local defined = "%" * Def / function (c,Defs)
local cat = Defs and Defs[c] or Predef[c]
if not cat then error ("name '" .. c .. "' undefined") end
return cat
end
local Range = m.Cs(any * (m.P"-"/"") * (any - "]")) / mm.R
local item = defined + Range + m.C(any)
local Class =
"["
* (m.C(m.P"^"^-1)) -- optional complement symbol
* m.Cf(item * (item - "]")^0, mt.__add) /
function (c, p) return c == "^" and any - p or p end
* "]"
local function adddef (t, k, exp)
if t[k] then
error("'"..k.."' already defined as a rule")
else
t[k] = exp
end
return t
end
local function firstdef (n, r) return adddef({n}, n, r) end
local function NT (n, b)
if not b then
error("rule '"..n.."' used outside a grammar")
else return mm.V(n)
end
end
local exp = m.P{ "Exp",
Exp = S * ( m.V"Grammar"
+ m.Cf(m.V"Seq" * ("/" * S * m.V"Seq")^0, mt.__add) );
Seq = m.Cf(m.Cc(m.P"") * m.V"Prefix"^0 , mt.__mul)
* (#seq_follow + patt_error);
Prefix = "&" * S * m.V"Prefix" / mt.__len
+ "!" * S * m.V"Prefix" / mt.__unm
+ m.V"Suffix";
Suffix = m.Cf(m.V"Primary" * S *
( ( m.P"+" * m.Cc(1, mt.__pow)
+ m.P"*" * m.Cc(0, mt.__pow)
+ m.P"?" * m.Cc(-1, mt.__pow)
+ "^" * ( m.Cg(num * m.Cc(mult))
+ m.Cg(m.C(m.S"+-" * m.R"09"^1) * m.Cc(mt.__pow))
)
+ "->" * S * ( m.Cg((String + num) * m.Cc(mt.__div))
+ m.P"{}" * m.Cc(nil, m.Ct)
+ m.Cg(Def / getdef * m.Cc(mt.__div))
)
+ "=>" * S * m.Cg(Def / getdef * m.Cc(m.Cmt))
) * S
)^0, function (a,b,f) return f(a,b) end );
Primary = "(" * m.V"Exp" * ")"
+ String / mm.P
+ Class
+ defined
+ "{:" * (name * ":" + m.Cc(nil)) * m.V"Exp" * ":}" /
function (n, p) return mm.Cg(p, n) end
+ "=" * name / function (n) return mm.Cmt(mm.Cb(n), equalcap) end
+ m.P"{}" / mm.Cp
+ "{~" * m.V"Exp" * "~}" / mm.Cs
+ "{|" * m.V"Exp" * "|}" / mm.Ct
+ "{" * m.V"Exp" * "}" / mm.C
+ m.P"." * m.Cc(any)
+ (name * -arrow + "<" * name * ">") * m.Cb("G") / NT;
Definition = name * arrow * m.V"Exp";
Grammar = m.Cg(m.Cc(true), "G") *
m.Cf(m.V"Definition" / firstdef * m.Cg(m.V"Definition")^0,
adddef) / mm.P
}
local pattern = S * m.Cg(m.Cc(false), "G") * exp / mm.P * (-any + patt_error)
local function compile (p, defs)
if mm.type(p) == "pattern" then return p end -- already compiled
local cp = pattern:match(p, 1, defs)
if not cp then error("incorrect pattern", 3) end
return cp
end
local function match (s, p, i)
local cp = mem[p]
if not cp then
cp = compile(p)
mem[p] = cp
end
return cp:match(s, i or 1)
end
local function find (s, p, i)
local cp = fmem[p]
if not cp then
cp = compile(p) / 0
cp = mm.P{ mm.Cp() * cp * mm.Cp() + 1 * mm.V(1) }
fmem[p] = cp
end
local i, e = cp:match(s, i or 1)
if i then return i, e - 1
else return i
end
end
local function gsub (s, p, rep)
local g = gmem[p] or {} -- ensure gmem[p] is not collected while here
gmem[p] = g
local cp = g[rep]
if not cp then
cp = compile(p)
cp = mm.Cs((cp / rep + 1)^0)
g[rep] = cp
end
return cp:match(s)
end
-- exported names
local re = {
compile = compile,
match = match,
find = find,
gsub = gsub,
updatelocale = updatelocale,
}
if version == "Lua 5.1" then _G.re = re end
return re

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src/ext/lpeg/test.lua Executable file
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