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sam.c
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sam.c
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/*
* Heavily inspired (and partially based upon) the X11 version of
* Rob Pike's sam text editor originally written for Plan 9.
*
* Copyright © 2016-2017 Marc André Tanner <mat at brain-dump.org>
* Copyright © 1998 by Lucent Technologies
*
* Permission to use, copy, modify, and distribute this software for any
* purpose without fee is hereby granted, provided that this entire notice
* is included in all copies of any software which is or includes a copy
* or modification of this software and in all copies of the supporting
* documentation for such software.
*
* THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTY. IN PARTICULAR, NEITHER THE AUTHORS NOR LUCENT TECHNOLOGIES MAKE ANY
* REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY
* OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE.
*/
#include <string.h>
#include <strings.h>
#include <stdio.h>
#include <ctype.h>
#include <errno.h>
#include <unistd.h>
#include <limits.h>
#include "sam.h"
#include "vis-core.h"
#include "buffer.h"
#include "text.h"
#include "text-motions.h"
#include "text-objects.h"
#include "text-regex.h"
#include "util.h"
#define MAX_ARGV 8
typedef struct Address Address;
typedef struct Command Command;
typedef struct CommandDef CommandDef;
struct Change {
enum ChangeType {
TRANSCRIPT_INSERT = 1 << 0,
TRANSCRIPT_DELETE = 1 << 1,
TRANSCRIPT_CHANGE = TRANSCRIPT_INSERT|TRANSCRIPT_DELETE,
} type;
Win *win; /* window in which changed file is being displayed */
Selection *cursor; /* cursor associated with this change, might be NULL */
Filerange range; /* inserts are denoted by zero sized range (same start/end) */
const char *data; /* will be free(3)-ed after transcript has been processed */
size_t len; /* size in bytes of the chunk pointed to by data */
Change *next; /* modification position increase monotonically */
};
struct Address {
char type; /* # (char) l (line) g (goto line) / ? . $ + - , ; % ' */
Regex *regex; /* NULL denotes default for x, y, X, and Y commands */
size_t number; /* line or character number */
Address *left; /* left hand side of a compound address , ; */
Address *right; /* either right hand side of a compound address or next address */
};
typedef struct {
int start, end; /* interval [n,m] */
bool mod; /* % every n-th match, implies n == m */
} Count;
struct Command {
const char *argv[MAX_ARGV];/* [0]=cmd-name, [1..MAX_ARGV-2]=arguments, last element always NULL */
Address *address; /* range of text for command */
Regex *regex; /* regex to match, used by x, y, g, v, X, Y */
const CommandDef *cmddef; /* which command is this? */
Count count; /* command count, defaults to [0,+inf] */
int iteration; /* current command loop iteration */
char flags; /* command specific flags */
Command *cmd; /* target of x, y, g, v, X, Y, { */
Command *next; /* next command in {} group */
};
struct CommandDef {
const char *name; /* command name */
VIS_HELP_DECL(const char *help;) /* short, one-line help text */
enum {
CMD_NONE = 0, /* standalone command without any arguments */
CMD_CMD = 1 << 0, /* does the command take a sub/target command? */
CMD_REGEX = 1 << 1, /* regex after command? */
CMD_REGEX_DEFAULT = 1 << 2, /* is the regex optional i.e. can we use a default? */
CMD_COUNT = 1 << 3, /* does the command support a count as in s2/../? */
CMD_TEXT = 1 << 4, /* does the command need a text to insert? */
CMD_ADDRESS_NONE = 1 << 5, /* is it an error to specify an address for the command? */
CMD_ADDRESS_POS = 1 << 6, /* no address implies an empty range at current cursor position */
CMD_ADDRESS_LINE = 1 << 7, /* if no address is given, use the current line */
CMD_ADDRESS_AFTER = 1 << 8, /* if no address is given, begin at the start of the next line */
CMD_ADDRESS_ALL = 1 << 9, /* if no address is given, apply to whole file (independent of #cursors) */
CMD_ADDRESS_ALL_1CURSOR = 1 << 10, /* if no address is given and only 1 cursor exists, apply to whole file */
CMD_SHELL = 1 << 11, /* command needs a shell command as argument */
CMD_FORCE = 1 << 12, /* can the command be forced with ! */
CMD_ARGV = 1 << 13, /* whether shell like argument splitting is desired */
CMD_ONCE = 1 << 14, /* command should only be executed once, not for every selection */
CMD_LOOP = 1 << 15, /* a looping construct like `x`, `y` */
CMD_GROUP = 1 << 16, /* a command group { ... } */
CMD_DESTRUCTIVE = 1 << 17, /* command potentially destroys window */
} flags;
const char *defcmd; /* name of a default target command */
bool (*func)(Vis*, Win*, Command*, const char *argv[], Selection*, Filerange*); /* command implementation */
};
/* sam commands */
static bool cmd_insert(Vis*, Win*, Command*, const char *argv[], Selection*, Filerange*);
static bool cmd_append(Vis*, Win*, Command*, const char *argv[], Selection*, Filerange*);
static bool cmd_change(Vis*, Win*, Command*, const char *argv[], Selection*, Filerange*);
static bool cmd_delete(Vis*, Win*, Command*, const char *argv[], Selection*, Filerange*);
static bool cmd_guard(Vis*, Win*, Command*, const char *argv[], Selection*, Filerange*);
static bool cmd_extract(Vis*, Win*, Command*, const char *argv[], Selection*, Filerange*);
static bool cmd_select(Vis*, Win*, Command*, const char *argv[], Selection*, Filerange*);
static bool cmd_print(Vis*, Win*, Command*, const char *argv[], Selection*, Filerange*);
static bool cmd_files(Vis*, Win*, Command*, const char *argv[], Selection*, Filerange*);
static bool cmd_pipein(Vis*, Win*, Command*, const char *argv[], Selection*, Filerange*);
static bool cmd_pipeout(Vis*, Win*, Command*, const char *argv[], Selection*, Filerange*);
static bool cmd_filter(Vis*, Win*, Command*, const char *argv[], Selection*, Filerange*);
static bool cmd_launch(Vis*, Win*, Command*, const char *argv[], Selection*, Filerange*);
static bool cmd_substitute(Vis*, Win*, Command*, const char *argv[], Selection*, Filerange*);
static bool cmd_write(Vis*, Win*, Command*, const char *argv[], Selection*, Filerange*);
static bool cmd_read(Vis*, Win*, Command*, const char *argv[], Selection*, Filerange*);
static bool cmd_edit(Vis*, Win*, Command*, const char *argv[], Selection*, Filerange*);
static bool cmd_quit(Vis*, Win*, Command*, const char *argv[], Selection*, Filerange*);
static bool cmd_cd(Vis*, Win*, Command*, const char *argv[], Selection*, Filerange*);
/* vi(m) commands */
static bool cmd_set(Vis*, Win*, Command*, const char *argv[], Selection*, Filerange*);
static bool cmd_open(Vis*, Win*, Command*, const char *argv[], Selection*, Filerange*);
static bool cmd_qall(Vis*, Win*, Command*, const char *argv[], Selection*, Filerange*);
static bool cmd_split(Vis*, Win*, Command*, const char *argv[], Selection*, Filerange*);
static bool cmd_vsplit(Vis*, Win*, Command*, const char *argv[], Selection*, Filerange*);
static bool cmd_new(Vis*, Win*, Command*, const char *argv[], Selection*, Filerange*);
static bool cmd_vnew(Vis*, Win*, Command*, const char *argv[], Selection*, Filerange*);
static bool cmd_wq(Vis*, Win*, Command*, const char *argv[], Selection*, Filerange*);
static bool cmd_earlier_later(Vis*, Win*, Command*, const char *argv[], Selection*, Filerange*);
static bool cmd_help(Vis*, Win*, Command*, const char *argv[], Selection*, Filerange*);
static bool cmd_map(Vis*, Win*, Command*, const char *argv[], Selection*, Filerange*);
static bool cmd_unmap(Vis*, Win*, Command*, const char *argv[], Selection*, Filerange*);
static bool cmd_langmap(Vis*, Win*, Command*, const char *argv[], Selection*, Filerange*);
static bool cmd_user(Vis*, Win*, Command*, const char *argv[], Selection*, Filerange*);
static const CommandDef cmds[] = {
// name help
// flags, default command, implemenation
{
"a", VIS_HELP("Append text after range")
CMD_TEXT, NULL, cmd_append
}, {
"c", VIS_HELP("Change text in range")
CMD_TEXT, NULL, cmd_change
}, {
"d", VIS_HELP("Delete text in range")
CMD_NONE, NULL, cmd_delete
}, {
"g", VIS_HELP("If range contains regexp, run command")
CMD_COUNT|CMD_REGEX|CMD_CMD, "p", cmd_guard
}, {
"i", VIS_HELP("Insert text before range")
CMD_TEXT, NULL, cmd_insert
}, {
"p", VIS_HELP("Create selection covering range")
CMD_NONE, NULL, cmd_print
}, {
"s", VIS_HELP("Substitute: use x/pattern/ c/replacement/ instead")
CMD_SHELL|CMD_ADDRESS_LINE, NULL, cmd_substitute
}, {
"v", VIS_HELP("If range does not contain regexp, run command")
CMD_COUNT|CMD_REGEX|CMD_CMD, "p", cmd_guard
}, {
"x", VIS_HELP("Set range and run command on each match")
CMD_CMD|CMD_REGEX|CMD_REGEX_DEFAULT|CMD_ADDRESS_ALL_1CURSOR|CMD_LOOP, "p", cmd_extract
}, {
"y", VIS_HELP("As `x` but select unmatched text")
CMD_CMD|CMD_REGEX|CMD_ADDRESS_ALL_1CURSOR|CMD_LOOP, "p", cmd_extract
}, {
"X", VIS_HELP("Run command on files whose name matches")
CMD_CMD|CMD_REGEX|CMD_REGEX_DEFAULT|CMD_ADDRESS_NONE|CMD_ONCE, NULL, cmd_files
}, {
"Y", VIS_HELP("As `X` but select unmatched files")
CMD_CMD|CMD_REGEX|CMD_ADDRESS_NONE|CMD_ONCE, NULL, cmd_files
}, {
">", VIS_HELP("Send range to stdin of command")
CMD_SHELL|CMD_ADDRESS_LINE, NULL, cmd_pipeout
}, {
"<", VIS_HELP("Replace range by stdout of command")
CMD_SHELL|CMD_ADDRESS_POS, NULL, cmd_pipein
}, {
"|", VIS_HELP("Pipe range through command")
CMD_SHELL|CMD_ADDRESS_POS, NULL, cmd_filter
}, {
"!", VIS_HELP("Run the command")
CMD_SHELL|CMD_ONCE|CMD_ADDRESS_NONE, NULL, cmd_launch
}, {
"w", VIS_HELP("Write range to named file")
CMD_ARGV|CMD_FORCE|CMD_ONCE|CMD_ADDRESS_ALL, NULL, cmd_write
}, {
"r", VIS_HELP("Replace range by contents of file")
CMD_ARGV|CMD_ADDRESS_AFTER, NULL, cmd_read
}, {
"{", VIS_HELP("Start of command group")
CMD_GROUP, NULL, NULL
}, {
"}", VIS_HELP("End of command group" )
CMD_NONE, NULL, NULL
}, {
"e", VIS_HELP("Edit file")
CMD_ARGV|CMD_FORCE|CMD_ONCE|CMD_ADDRESS_NONE|CMD_DESTRUCTIVE, NULL, cmd_edit
}, {
"q", VIS_HELP("Quit the current window")
CMD_FORCE|CMD_ONCE|CMD_ADDRESS_NONE|CMD_DESTRUCTIVE, NULL, cmd_quit
}, {
"cd", VIS_HELP("Change directory")
CMD_ARGV|CMD_ONCE|CMD_ADDRESS_NONE, NULL, cmd_cd
},
/* vi(m) related commands */
{
"help", VIS_HELP("Show this help")
CMD_ARGV|CMD_ONCE|CMD_ADDRESS_NONE, NULL, cmd_help
}, {
"map", VIS_HELP("Map key binding `:map <mode> <lhs> <rhs>`")
CMD_ARGV|CMD_FORCE|CMD_ONCE|CMD_ADDRESS_NONE, NULL, cmd_map
}, {
"map-window", VIS_HELP("As `map` but window local")
CMD_ARGV|CMD_FORCE|CMD_ONCE|CMD_ADDRESS_NONE, NULL, cmd_map
}, {
"unmap", VIS_HELP("Unmap key binding `:unmap <mode> <lhs>`")
CMD_ARGV|CMD_ONCE|CMD_ADDRESS_NONE, NULL, cmd_unmap
}, {
"unmap-window", VIS_HELP("As `unmap` but window local")
CMD_ARGV|CMD_ONCE|CMD_ADDRESS_NONE, NULL, cmd_unmap
}, {
"langmap", VIS_HELP("Map keyboard layout `:langmap <locale-keys> <latin-keys>`")
CMD_ARGV|CMD_FORCE|CMD_ONCE|CMD_ADDRESS_NONE, NULL, cmd_langmap
}, {
"new", VIS_HELP("Create new window")
CMD_ARGV|CMD_ONCE|CMD_ADDRESS_NONE, NULL, cmd_new
}, {
"open", VIS_HELP("Open file")
CMD_ARGV|CMD_ONCE|CMD_ADDRESS_NONE, NULL, cmd_open
}, {
"qall", VIS_HELP("Exit vis")
CMD_FORCE|CMD_ONCE|CMD_ADDRESS_NONE|CMD_DESTRUCTIVE, NULL, cmd_qall
}, {
"set", VIS_HELP("Set option")
CMD_ARGV|CMD_ONCE|CMD_ADDRESS_NONE, NULL, cmd_set
}, {
"split", VIS_HELP("Horizontally split window")
CMD_ARGV|CMD_ONCE|CMD_ADDRESS_NONE, NULL, cmd_split
}, {
"vnew", VIS_HELP("As `:new` but split vertically")
CMD_ARGV|CMD_ONCE|CMD_ADDRESS_NONE, NULL, cmd_vnew
}, {
"vsplit", VIS_HELP("Vertically split window")
CMD_ARGV|CMD_ONCE|CMD_ADDRESS_NONE, NULL, cmd_vsplit
}, {
"wq", VIS_HELP("Write file and quit")
CMD_ARGV|CMD_FORCE|CMD_ONCE|CMD_ADDRESS_ALL|CMD_DESTRUCTIVE, NULL, cmd_wq
}, {
"earlier", VIS_HELP("Go to older text state")
CMD_ARGV|CMD_ONCE|CMD_ADDRESS_NONE, NULL, cmd_earlier_later
}, {
"later", VIS_HELP("Go to newer text state")
CMD_ARGV|CMD_ONCE|CMD_ADDRESS_NONE, NULL, cmd_earlier_later
},
{ NULL, VIS_HELP(NULL) CMD_NONE, NULL, NULL },
};
static const CommandDef cmddef_select = {
NULL, VIS_HELP(NULL) CMD_NONE, NULL, cmd_select
};
/* :set command options */
typedef struct {
const char *names[3]; /* name and optional alias */
enum VisOption flags; /* option type, etc. */
VIS_HELP_DECL(const char *help;) /* short, one line help text */
VisOptionFunction *func; /* option handler, NULL for bulitins */
void *context; /* context passed to option handler function */
} OptionDef;
enum {
OPTION_SHELL,
OPTION_ESCDELAY,
OPTION_AUTOINDENT,
OPTION_EXPANDTAB,
OPTION_TABWIDTH,
OPTION_SHOW_SPACES,
OPTION_SHOW_TABS,
OPTION_SHOW_NEWLINES,
OPTION_SHOW_EOF,
OPTION_NUMBER,
OPTION_NUMBER_RELATIVE,
OPTION_CURSOR_LINE,
OPTION_COLOR_COLUMN,
OPTION_SAVE_METHOD,
OPTION_CHANGE_256COLORS,
};
static const OptionDef options[] = {
[OPTION_SHELL] = {
{ "shell" },
VIS_OPTION_TYPE_STRING,
VIS_HELP("Shell to use for external commands (default: $SHELL, /etc/passwd, /bin/sh)")
},
[OPTION_ESCDELAY] = {
{ "escdelay" },
VIS_OPTION_TYPE_NUMBER,
VIS_HELP("Milliseconds to wait to distinguish <Escape> from terminal escape sequences")
},
[OPTION_AUTOINDENT] = {
{ "autoindent", "ai" },
VIS_OPTION_TYPE_BOOL,
VIS_HELP("Copy leading white space from previous line")
},
[OPTION_EXPANDTAB] = {
{ "expandtab", "et" },
VIS_OPTION_TYPE_BOOL,
VIS_HELP("Replace entered <Tab> with `tabwidth` spaces")
},
[OPTION_TABWIDTH] = {
{ "tabwidth", "tw" },
VIS_OPTION_TYPE_NUMBER,
VIS_HELP("Number of spaces to display (and insert if `expandtab` is enabled) for a tab")
},
[OPTION_SHOW_SPACES] = {
{ "show-spaces" },
VIS_OPTION_TYPE_BOOL|VIS_OPTION_NEED_WINDOW,
VIS_HELP("Display replacement symbol instead of a space")
},
[OPTION_SHOW_TABS] = {
{ "show-tabs" },
VIS_OPTION_TYPE_BOOL|VIS_OPTION_NEED_WINDOW,
VIS_HELP("Display replacement symbol for tabs")
},
[OPTION_SHOW_NEWLINES] = {
{ "show-newlines" },
VIS_OPTION_TYPE_BOOL|VIS_OPTION_NEED_WINDOW,
VIS_HELP("Display replacement symbol for newlines")
},
[OPTION_SHOW_EOF] = {
{ "show-eof" },
VIS_OPTION_TYPE_BOOL|VIS_OPTION_NEED_WINDOW,
VIS_HELP("Display replacement symbol for lines after the end of the file")
},
[OPTION_NUMBER] = {
{ "numbers", "nu" },
VIS_OPTION_TYPE_BOOL|VIS_OPTION_NEED_WINDOW,
VIS_HELP("Display absolute line numbers")
},
[OPTION_NUMBER_RELATIVE] = {
{ "relativenumbers", "rnu" },
VIS_OPTION_TYPE_BOOL|VIS_OPTION_NEED_WINDOW,
VIS_HELP("Display relative line numbers")
},
[OPTION_CURSOR_LINE] = {
{ "cursorline", "cul" },
VIS_OPTION_TYPE_BOOL|VIS_OPTION_NEED_WINDOW,
VIS_HELP("Highlight current cursor line")
},
[OPTION_COLOR_COLUMN] = {
{ "colorcolumn", "cc" },
VIS_OPTION_TYPE_NUMBER|VIS_OPTION_NEED_WINDOW,
VIS_HELP("Highlight a fixed column")
},
[OPTION_SAVE_METHOD] = {
{ "savemethod" },
VIS_OPTION_TYPE_STRING|VIS_OPTION_NEED_WINDOW,
VIS_HELP("Save method to use for current file 'auto', 'atomic' or 'inplace'")
},
[OPTION_CHANGE_256COLORS] = {
{ "change-256colors" },
VIS_OPTION_TYPE_BOOL,
VIS_HELP("Change 256 color palette to support 24bit colors")
},
};
bool sam_init(Vis *vis) {
if (!(vis->cmds = map_new()))
return false;
bool ret = true;
for (const CommandDef *cmd = cmds; cmd && cmd->name; cmd++)
ret &= map_put(vis->cmds, cmd->name, cmd);
if (!(vis->options = map_new()))
return false;
for (int i = 0; i < LENGTH(options); i++) {
for (const char *const *name = options[i].names; *name; name++)
ret &= map_put(vis->options, *name, &options[i]);
}
return ret;
}
const char *sam_error(enum SamError err) {
static const char *error_msg[] = {
[SAM_ERR_OK] = "Success",
[SAM_ERR_MEMORY] = "Out of memory",
[SAM_ERR_ADDRESS] = "Bad address",
[SAM_ERR_NO_ADDRESS] = "Command takes no address",
[SAM_ERR_UNMATCHED_BRACE] = "Unmatched `}'",
[SAM_ERR_REGEX] = "Bad regular expression",
[SAM_ERR_TEXT] = "Bad text",
[SAM_ERR_SHELL] = "Shell command expected",
[SAM_ERR_COMMAND] = "Unknown command",
[SAM_ERR_EXECUTE] = "Error executing command",
[SAM_ERR_NEWLINE] = "Newline expected",
[SAM_ERR_MARK] = "Invalid mark",
[SAM_ERR_CONFLICT] = "Conflicting changes",
[SAM_ERR_WRITE_CONFLICT] = "Can not write while changing",
[SAM_ERR_LOOP_INVALID_CMD] = "Destructive command in looping construct",
[SAM_ERR_GROUP_INVALID_CMD] = "Destructive command in group",
[SAM_ERR_COUNT] = "Invalid count",
};
size_t idx = err;
return idx < LENGTH(error_msg) ? error_msg[idx] : NULL;
}
static void change_free(Change *c) {
if (!c)
return;
free((char*)c->data);
free(c);
}
static Change *change_new(Transcript *t, enum ChangeType type, Filerange *range, Win *win, Selection *sel) {
if (!text_range_valid(range))
return NULL;
Change **prev, *next;
if (t->latest && t->latest->range.end <= range->start) {
prev = &t->latest->next;
next = t->latest->next;
} else {
prev = &t->changes;
next = t->changes;
}
while (next && next->range.end <= range->start) {
prev = &next->next;
next = next->next;
}
if (next && next->range.start < range->end) {
t->error = SAM_ERR_CONFLICT;
return NULL;
}
Change *new = calloc(1, sizeof *new);
if (new) {
new->type = type;
new->range = *range;
new->cursor = sel;
new->win = win;
new->next = next;
*prev = new;
t->latest = new;
}
return new;
}
static void sam_transcript_init(Transcript *t) {
memset(t, 0, sizeof *t);
}
static bool sam_transcript_error(Transcript *t, enum SamError error) {
if (t->changes)
t->error = error;
return t->error;
}
static void sam_transcript_free(Transcript *t) {
for (Change *c = t->changes, *next; c; c = next) {
next = c->next;
change_free(c);
}
}
static bool sam_insert(Win *win, Selection *sel, size_t pos, const char *data, size_t len) {
Filerange range = text_range_new(pos, pos);
Change *c = change_new(&win->file->transcript, TRANSCRIPT_INSERT, &range, win, sel);
if (c) {
c->data = data;
c->len = len;
}
return c;
}
static bool sam_delete(Win *win, Selection *sel, Filerange *range) {
return change_new(&win->file->transcript, TRANSCRIPT_DELETE, range, win, sel);
}
static bool sam_change(Win *win, Selection *sel, Filerange *range, const char *data, size_t len) {
Change *c = change_new(&win->file->transcript, TRANSCRIPT_CHANGE, range, win, sel);
if (c) {
c->data = data;
c->len = len;
}
return c;
}
static Address *address_new(void) {
Address *addr = calloc(1, sizeof *addr);
if (addr)
addr->number = EPOS;
return addr;
}
static void address_free(Address *addr) {
if (!addr)
return;
text_regex_free(addr->regex);
address_free(addr->left);
address_free(addr->right);
free(addr);
}
static void skip_spaces(const char **s) {
while (**s == ' ' || **s == '\t')
(*s)++;
}
static char *parse_until(const char **s, const char *until, const char *escchars, int type){
Buffer buf;
buffer_init(&buf);
size_t len = strlen(until);
bool escaped = false;
for (; **s && (!memchr(until, **s, len) || escaped); (*s)++) {
if (type != CMD_SHELL && !escaped && **s == '\\') {
escaped = true;
continue;
}
char c = **s;
if (escaped) {
escaped = false;
if (c == '\n')
continue;
if (c == 'n') {
c = '\n';
} else if (c == 't') {
c = '\t';
} else if (type != CMD_REGEX && type != CMD_TEXT && c == '\\') {
// ignore one of the back slashes
} else {
bool delim = memchr(until, c, len);
bool esc = escchars && memchr(escchars, c, strlen(escchars));
if (!delim && !esc)
buffer_append(&buf, "\\", 1);
}
}
if (!buffer_append(&buf, &c, 1)) {
buffer_release(&buf);
return NULL;
}
}
buffer_terminate(&buf);
return buffer_move(&buf);
}
static char *parse_delimited(const char **s, int type) {
char delim[2] = { **s, '\0' };
if (!delim[0] || isspace((unsigned char)delim[0]))
return NULL;
(*s)++;
char *chunk = parse_until(s, delim, NULL, type);
if (**s == delim[0])
(*s)++;
return chunk;
}
static char *parse_text(const char **s) {
skip_spaces(s);
if (**s != '\n') {
const char *before = *s;
char *text = parse_delimited(s, CMD_TEXT);
return (!text && *s != before) ? strdup("") : text;
}
Buffer buf;
buffer_init(&buf);
const char *start = *s + 1;
bool dot = false;
for ((*s)++; **s && (!dot || **s != '\n'); (*s)++)
dot = (**s == '.');
if (!dot || !buffer_put(&buf, start, *s - start - 1) ||
!buffer_append(&buf, "\0", 1)) {
buffer_release(&buf);
return NULL;
}
return buffer_move(&buf);
}
static char *parse_shellcmd(Vis *vis, const char **s) {
skip_spaces(s);
char *cmd = parse_until(s, "\n", NULL, false);
if (!cmd) {
const char *last_cmd = register_get(vis, &vis->registers[VIS_REG_SHELL], NULL);
return last_cmd ? strdup(last_cmd) : NULL;
}
register_put0(vis, &vis->registers[VIS_REG_SHELL], cmd);
return cmd;
}
static void parse_argv(const char **s, const char *argv[], size_t maxarg) {
for (size_t i = 0; i < maxarg; i++) {
skip_spaces(s);
if (**s == '"' || **s == '\'')
argv[i] = parse_delimited(s, CMD_ARGV);
else
argv[i] = parse_until(s, " \t\n", "\'\"", CMD_ARGV);
}
}
static bool valid_cmdname(const char *s) {
unsigned char c = (unsigned char)*s;
return c && !isspace(c) && !isdigit(c) && (!ispunct(c) || (c == '-' && valid_cmdname(s+1)));
}
static char *parse_cmdname(const char **s) {
Buffer buf;
buffer_init(&buf);
skip_spaces(s);
while (valid_cmdname(*s))
buffer_append(&buf, (*s)++, 1);
buffer_terminate(&buf);
return buffer_move(&buf);
}
static Regex *parse_regex(Vis *vis, const char **s) {
const char *before = *s;
char *pattern = parse_delimited(s, CMD_REGEX);
if (!pattern && *s == before)
return NULL;
Regex *regex = vis_regex(vis, pattern);
free(pattern);
return regex;
}
static int parse_number(const char **s) {
char *end = NULL;
int number = strtoull(*s, &end, 10);
if (end == *s)
return 0;
*s = end;
return number;
}
static enum SamError parse_count(const char **s, Count *count) {
count->mod = **s == '%';
if (count->mod) {
(*s)++;
int n = parse_number(s);
if (!n)
return SAM_ERR_COUNT;
count->start = n;
count->end = n;
return SAM_ERR_OK;
}
const char *before = *s;
if (!(count->start = parse_number(s)) && *s != before)
return SAM_ERR_COUNT;
if (**s != ',') {
count->end = count->start ? count->start : INT_MAX;
return SAM_ERR_OK;
} else {
(*s)++;
}
before = *s;
if (!(count->end = parse_number(s)) && *s != before)
return SAM_ERR_COUNT;
if (!count->end)
count->end = INT_MAX;
return SAM_ERR_OK;
}
static Address *address_parse_simple(Vis *vis, const char **s, enum SamError *err) {
skip_spaces(s);
Address addr = {
.type = **s,
.regex = NULL,
.number = EPOS,
.left = NULL,
.right = NULL,
};
switch (addr.type) {
case '#': /* character #n */
(*s)++;
addr.number = parse_number(s);
break;
case '0': case '1': case '2': case '3': case '4': /* line n */
case '5': case '6': case '7': case '8': case '9':
addr.type = 'l';
addr.number = parse_number(s);
break;
case '\'':
(*s)++;
if ((addr.number = vis_mark_from(vis, **s)) == VIS_MARK_INVALID) {
*err = SAM_ERR_MARK;
return NULL;
}
(*s)++;
break;
case '/': /* regexp forwards */
case '?': /* regexp backwards */
addr.regex = parse_regex(vis, s);
if (!addr.regex) {
*err = SAM_ERR_REGEX;
return NULL;
}
break;
case '$': /* end of file */
case '.':
case '+':
case '-':
case '%':
(*s)++;
break;
default:
return NULL;
}
if ((addr.right = address_parse_simple(vis, s, err))) {
switch (addr.right->type) {
case '.':
case '$':
return NULL;
case '#':
case 'l':
case '/':
case '?':
if (addr.type != '+' && addr.type != '-') {
Address *plus = address_new();
if (!plus) {
address_free(addr.right);
return NULL;
}
plus->type = '+';
plus->right = addr.right;
addr.right = plus;
}
break;
}
}
Address *ret = address_new();
if (!ret) {
address_free(addr.right);
return NULL;
}
*ret = addr;
return ret;
}
static Address *address_parse_compound(Vis *vis, const char **s, enum SamError *err) {
Address addr = { 0 }, *left = address_parse_simple(vis, s, err), *right = NULL;
skip_spaces(s);
addr.type = **s;
switch (addr.type) {
case ',': /* a1,a2 */
case ';': /* a1;a2 */
(*s)++;
right = address_parse_compound(vis, s, err);
if (right && (right->type == ',' || right->type == ';') && !right->left) {
*err = SAM_ERR_ADDRESS;
goto fail;
}
break;
default:
return left;
}
addr.left = left;
addr.right = right;
Address *ret = address_new();
if (ret) {
*ret = addr;
return ret;
}
fail:
address_free(left);
address_free(right);
return NULL;
}
static Command *command_new(const char *name) {
Command *cmd = calloc(1, sizeof(Command));
if (!cmd)
return NULL;
if (name && !(cmd->argv[0] = strdup(name))) {
free(cmd);
return NULL;
}
return cmd;
}
static void command_free(Command *cmd) {
if (!cmd)
return;
for (Command *c = cmd->cmd, *next; c; c = next) {
next = c->next;
command_free(c);
}
for (const char **args = cmd->argv; *args; args++)
free((void*)*args);
address_free(cmd->address);
text_regex_free(cmd->regex);
free(cmd);
}
static const CommandDef *command_lookup(Vis *vis, const char *name) {
return map_closest(vis->cmds, name);
}
static Command *command_parse(Vis *vis, const char **s, enum SamError *err) {
if (!**s) {
*err = SAM_ERR_COMMAND;
return NULL;
}
Command *cmd = command_new(NULL);
if (!cmd)
return NULL;
cmd->address = address_parse_compound(vis, s, err);
skip_spaces(s);
cmd->argv[0] = parse_cmdname(s);
if (!cmd->argv[0]) {
char name[2] = { **s ? **s : 'p', '\0' };
if (**s)
(*s)++;
if (!(cmd->argv[0] = strdup(name)))
goto fail;
}
const CommandDef *cmddef = command_lookup(vis, cmd->argv[0]);
if (!cmddef) {
*err = SAM_ERR_COMMAND;
goto fail;
}
cmd->cmddef = cmddef;
if (strcmp(cmd->argv[0], "{") == 0) {
Command *prev = NULL, *next;
int level = vis->nesting_level++;
do {
while (**s == ' ' || **s == '\t' || **s == '\n')
(*s)++;
next = command_parse(vis, s, err);
if (*err)
goto fail;
if (prev)
prev->next = next;
else
cmd->cmd = next;
} while ((prev = next));
if (level != vis->nesting_level) {
*err = SAM_ERR_UNMATCHED_BRACE;
goto fail;
}
} else if (strcmp(cmd->argv[0], "}") == 0) {
if (vis->nesting_level-- == 0) {
*err = SAM_ERR_UNMATCHED_BRACE;
goto fail;
}
command_free(cmd);
return NULL;
}
if (cmddef->flags & CMD_ADDRESS_NONE && cmd->address) {
*err = SAM_ERR_NO_ADDRESS;
goto fail;
}
if (cmddef->flags & CMD_FORCE && **s == '!') {
cmd->flags = '!';
(*s)++;
}
if ((cmddef->flags & CMD_COUNT) && (*err = parse_count(s, &cmd->count)))
goto fail;
if (cmddef->flags & CMD_REGEX) {
if ((cmddef->flags & CMD_REGEX_DEFAULT) && (!**s || **s == ' ')) {
skip_spaces(s);
} else {
const char *before = *s;
cmd->regex = parse_regex(vis, s);
if (!cmd->regex && (*s != before || !(cmddef->flags & CMD_COUNT))) {
*err = SAM_ERR_REGEX;
goto fail;
}
}
}
if (cmddef->flags & CMD_SHELL && !(cmd->argv[1] = parse_shellcmd(vis, s))) {
*err = SAM_ERR_SHELL;
goto fail;
}
if (cmddef->flags & CMD_TEXT && !(cmd->argv[1] = parse_text(s))) {
*err = SAM_ERR_TEXT;
goto fail;
}
if (cmddef->flags & CMD_ARGV) {
parse_argv(s, &cmd->argv[1], MAX_ARGV-2);
cmd->argv[MAX_ARGV-1] = NULL;
}
if (cmddef->flags & CMD_CMD) {
skip_spaces(s);
if (cmddef->defcmd && (**s == '\n' || **s == '}' || **s == '\0')) {
if (**s == '\n')
(*s)++;
if (!(cmd->cmd = command_new(cmddef->defcmd)))
goto fail;
cmd->cmd->cmddef = command_lookup(vis, cmddef->defcmd);
} else {
if (!(cmd->cmd = command_parse(vis, s, err)))
goto fail;
if (strcmp(cmd->argv[0], "X") == 0 || strcmp(cmd->argv[0], "Y") == 0) {
Command *sel = command_new("select");
if (!sel)
goto fail;
sel->cmd = cmd->cmd;
sel->cmddef = &cmddef_select;
cmd->cmd = sel;
}
}
}
return cmd;
fail:
command_free(cmd);
return NULL;
}
static Command *sam_parse(Vis *vis, const char *cmd, enum SamError *err) {
vis->nesting_level = 0;
const char **s = &cmd;
Command *c = command_parse(vis, s, err);
if (!c)
return NULL;
while (**s == ' ' || **s == '\t' || **s == '\n')
(*s)++;
if (**s) {
*err = SAM_ERR_NEWLINE;
command_free(c);
return NULL;
}
Command *sel = command_new("select");
if (!sel) {
command_free(c);
return NULL;
}
sel->cmd = c;
sel->cmddef = &cmddef_select;
return sel;
}
static Filerange address_line_evaluate(Address *addr, File *file, Filerange *range, int sign) {
Text *txt = file->text;
size_t offset = addr->number != EPOS ? addr->number : 1;
size_t start = range->start, end = range->end, line;
if (sign > 0) {
char c;
if (start < end && end > 0 && text_byte_get(txt, end-1, &c) && c == '\n')
end--;
line = text_lineno_by_pos(txt, end);
line = text_pos_by_lineno(txt, line + offset);
} else if (sign < 0) {
line = text_lineno_by_pos(txt, start);
line = offset < line ? text_pos_by_lineno(txt, line - offset) : 0;
} else {
if (addr->number == 0)
return text_range_new(0, 0);
line = text_pos_by_lineno(txt, addr->number);
}