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fish-shell/highlight.cpp

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/** \file highlight.c
Functions for syntax highlighting
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <sys/stat.h>
#include <unistd.h>
#include <errno.h>
#include <wchar.h>
#include <wctype.h>
#include <termios.h>
#include <signal.h>
#include "fallback.h"
#include "util.h"
#include "wutil.h"
#include "highlight.h"
#include "tokenizer.h"
#include "proc.h"
#include "parser.h"
#include "parse_util.h"
#include "parser_keywords.h"
#include "builtin.h"
#include "function.h"
#include "env.h"
#include "expand.h"
#include "sanity.h"
#include "common.h"
#include "complete.h"
#include "output.h"
#include "wildcard.h"
#include "path.h"
/**
Number of elements in the highlight_var array
*/
#define VAR_COUNT ( sizeof(highlight_var)/sizeof(wchar_t *) )
static void highlight_universal_internal( const wchar_t * buff,
int *color,
int pos );
/**
The environment variables used to specify the color of different tokens.
*/
static const wchar_t * const highlight_var[] =
{
L"fish_color_normal",
L"fish_color_error",
L"fish_color_command",
L"fish_color_end",
L"fish_color_param",
L"fish_color_comment",
L"fish_color_match",
L"fish_color_search_match",
L"fish_color_operator",
L"fish_color_escape",
L"fish_color_quote",
L"fish_color_redirection",
L"fish_color_valid_path",
L"fish_color_autosuggestion"
};
/**
Tests if the specified string is the prefix of any valid path in the system.
\return zero it this is not a valid prefix, non-zero otherwise
*/
// PCA DOES_IO
static bool is_potential_path( const wcstring &cpath )
{
ASSERT_IS_BACKGROUND_THREAD();
const wchar_t *unescaped, *in;
wcstring cleaned_path;
int has_magic = 0;
bool res = false;
wcstring path(cpath);
expand_tilde(path);
if (! unescape_string(path, 1))
return false;
unescaped = path.c_str();
// debug( 1, L"%ls -> %ls ->%ls", path, tilde, unescaped );
for( in = unescaped; *in; in++ )
{
switch( *in )
{
case PROCESS_EXPAND:
case VARIABLE_EXPAND:
case VARIABLE_EXPAND_SINGLE:
case BRACKET_BEGIN:
case BRACKET_END:
case BRACKET_SEP:
case ANY_CHAR:
case ANY_STRING:
case ANY_STRING_RECURSIVE:
{
has_magic = 1;
break;
}
case INTERNAL_SEPARATOR:
{
break;
}
default:
{
cleaned_path += *in;
break;
}
}
}
if( !has_magic && cleaned_path.length() )
{
int must_be_dir = 0;
DIR *dir;
must_be_dir = cleaned_path[cleaned_path.length()-1] == L'/';
if( must_be_dir )
{
dir = wopendir( cleaned_path.c_str() );
res = !!dir;
if( dir )
{
closedir( dir );
}
}
else
{
wcstring dir_name = wdirname(cleaned_path);
wcstring base_name = wbasename(cleaned_path);
if( dir_name == L"/" && base_name == L"/" )
{
res = true;
}
else if( (dir = wopendir( dir_name.c_str() )) )
{
wcstring ent;
while (wreaddir(dir, ent))
{
if( wcsncmp( ent.c_str(), base_name.c_str(), base_name.length() ) == 0 )
{
res = true;
break;
}
}
closedir( dir );
}
}
}
return res;
}
rgb_color_t highlight_get_color( int highlight, bool is_background )
{
size_t i;
int idx=0;
rgb_color_t result;
if( highlight < 0 )
return rgb_color_t::normal();
if( highlight > (1<<VAR_COUNT) )
return rgb_color_t::normal();
for( i=0; i<VAR_COUNT; i++ )
{
if( highlight & (1<<i ))
{
idx = i;
break;
}
}
env_var_t val_wstr = env_get_string( highlight_var[idx]);
// debug( 1, L"%d -> %d -> %ls", highlight, idx, val );
if (val_wstr.missing())
val_wstr = env_get_string( highlight_var[0]);
if( ! val_wstr.missing() )
result = parse_color( val_wstr, is_background );
if( highlight & HIGHLIGHT_VALID_PATH )
{
env_var_t val2_wstr = env_get_string( L"fish_color_valid_path" );
const wcstring val2 = val2_wstr.missing() ? L"" : val2_wstr.c_str();
rgb_color_t result2 = parse_color( val2, is_background );
if( result.is_normal() )
result = result2;
else
{
if( result2.is_bold() )
result.set_bold(true);
if( result2.is_underline() )
result.set_underline(true);
}
}
return result;
}
/**
Highligt operators (such as $, ~, %, as well as escaped characters.
*/
static void highlight_param( const wchar_t * buff,
int *color,
int pos,
wcstring_list_t *error )
{
int mode = 0;
int in_pos, len = wcslen( buff );
int bracket_count=0;
wchar_t c;
int normal_status = *color;
for( in_pos=0;
in_pos<len;
in_pos++ )
{
c = buff[in_pos];
switch( mode )
{
/*
Mode 0 means unquoted string
*/
case 0:
{
if( c == L'\\' )
{
int start_pos = in_pos;
in_pos++;
if( wcschr( L"~%", buff[in_pos] ) )
{
if( in_pos == 1 )
{
color[start_pos] = HIGHLIGHT_ESCAPE;
color[in_pos+1] = normal_status;
}
}
else if( buff[in_pos]==L',' )
{
if( bracket_count )
{
color[start_pos] = HIGHLIGHT_ESCAPE;
color[in_pos+1] = normal_status;
}
}
else if( wcschr( L"abefnrtv*?$(){}[]'\"<>^ \\#;|&", buff[in_pos] ) )
{
color[start_pos]=HIGHLIGHT_ESCAPE;
color[in_pos+1]=normal_status;
}
else if( wcschr( L"c", buff[in_pos] ) )
{
color[start_pos]=HIGHLIGHT_ESCAPE;
color[in_pos+2]=normal_status;
}
else if( wcschr( L"uUxX01234567", buff[in_pos] ) )
{
int i;
long long res=0;
int chars=2;
int base=16;
int byte = 0;
wchar_t max_val = ASCII_MAX;
switch( buff[in_pos] )
{
case L'u':
{
chars=4;
max_val = UCS2_MAX;
break;
}
case L'U':
{
chars=8;
max_val = WCHAR_MAX;
break;
}
case L'x':
{
break;
}
case L'X':
{
byte=1;
max_val = BYTE_MAX;
break;
}
default:
{
base=8;
chars=3;
in_pos--;
break;
}
}
for( i=0; i<chars; i++ )
{
int d = convert_digit( buff[++in_pos],base);
if( d < 0 )
{
in_pos--;
break;
}
res=(res*base)|d;
}
if( (res <= max_val) )
{
color[start_pos] = HIGHLIGHT_ESCAPE;
color[in_pos+1] = normal_status;
}
else
{
color[start_pos] = HIGHLIGHT_ERROR;
color[in_pos+1] = normal_status;
}
}
}
else
{
switch( buff[in_pos]){
case L'~':
case L'%':
{
if( in_pos == 0 )
{
color[in_pos] = HIGHLIGHT_OPERATOR;
color[in_pos+1] = normal_status;
}
break;
}
case L'$':
{
wchar_t n = buff[in_pos+1];
color[in_pos] = (n==L'$'||wcsvarchr(n))? HIGHLIGHT_OPERATOR:HIGHLIGHT_ERROR;
color[in_pos+1] = normal_status;
break;
}
case L'*':
case L'?':
case L'(':
case L')':
{
color[in_pos] = HIGHLIGHT_OPERATOR;
color[in_pos+1] = normal_status;
break;
}
case L'{':
{
color[in_pos] = HIGHLIGHT_OPERATOR;
color[in_pos+1] = normal_status;
bracket_count++;
break;
}
case L'}':
{
color[in_pos] = HIGHLIGHT_OPERATOR;
color[in_pos+1] = normal_status;
bracket_count--;
break;
}
case L',':
{
if( bracket_count )
{
color[in_pos] = HIGHLIGHT_OPERATOR;
color[in_pos+1] = normal_status;
}
break;
}
case L'\'':
{
color[in_pos] = HIGHLIGHT_QUOTE;
mode = 1;
break;
}
case L'\"':
{
color[in_pos] = HIGHLIGHT_QUOTE;
mode = 2;
break;
}
}
}
break;
}
/*
Mode 1 means single quoted string, i.e 'foo'
*/
case 1:
{
if( c == L'\\' )
{
int start_pos = in_pos;
switch( buff[++in_pos] )
{
case '\\':
case L'\'':
{
color[start_pos] = HIGHLIGHT_ESCAPE;
color[in_pos+1] = HIGHLIGHT_QUOTE;
break;
}
case 0:
{
return;
}
}
}
if( c == L'\'' )
{
mode = 0;
color[in_pos+1] = normal_status;
}
break;
}
/*
Mode 2 means double quoted string, i.e. "foo"
*/
case 2:
{
switch( c )
{
case '"':
{
mode = 0;
color[in_pos+1] = normal_status;
break;
}
case '\\':
{
int start_pos = in_pos;
switch( buff[++in_pos] )
{
case L'\0':
{
return;
}
case '\\':
case L'$':
case '"':
{
color[start_pos] = HIGHLIGHT_ESCAPE;
color[in_pos+1] = HIGHLIGHT_QUOTE;
break;
}
}
break;
}
case '$':
{
wchar_t n = buff[in_pos+1];
color[in_pos] = (n==L'$'||wcsvarchr(n))? HIGHLIGHT_OPERATOR:HIGHLIGHT_ERROR;
color[in_pos+1] = HIGHLIGHT_QUOTE;
break;
}
}
break;
}
}
}
}
static int has_expand_reserved( const wchar_t *str )
{
while( *str )
{
if( *str >= EXPAND_RESERVED &&
*str <= EXPAND_RESERVED_END )
{
return 1;
}
str++;
}
return 0;
}
// This function does I/O
static void tokenize( const wchar_t * const buff, int * const color, const int pos, wcstring_list_t *error, const env_vars &vars) {
ASSERT_IS_BACKGROUND_THREAD();
wcstring cmd;
int had_cmd=0;
int i;
wcstring last_cmd;
int len;
int accept_switches = 1;
int use_function = 1;
int use_command = 1;
int use_builtin = 1;
CHECK( buff, );
CHECK( color, );
len = wcslen(buff);
if( !len )
return;
for( i=0; buff[i] != 0; i++ )
color[i] = -1;
tokenizer tok;
for( tok_init( &tok, buff, TOK_SHOW_COMMENTS | TOK_SQUASH_ERRORS );
tok_has_next( &tok );
tok_next( &tok ) )
{
int last_type = tok_last_type( &tok );
int prev_argc=0;
switch( last_type )
{
case TOK_STRING:
{
if( had_cmd )
{
/*Parameter */
wchar_t *param = tok_last( &tok );
if( param[0] == L'-' )
{
if (wcscmp( param, L"--" ) == 0 )
{
accept_switches = 0;
color[ tok_get_pos( &tok ) ] = HIGHLIGHT_PARAM;
}
else if( accept_switches )
{
if( complete_is_valid_option( last_cmd.c_str(), param, error, false /* no autoload */ ) )
color[ tok_get_pos( &tok ) ] = HIGHLIGHT_PARAM;
else
color[ tok_get_pos( &tok ) ] = HIGHLIGHT_ERROR;
}
else
{
color[ tok_get_pos( &tok ) ] = HIGHLIGHT_PARAM;
}
}
else
{
color[ tok_get_pos( &tok ) ] = HIGHLIGHT_PARAM;
}
if( cmd == L"cd" )
{
wcstring dir = tok_last( &tok );
if (expand_one(dir, EXPAND_SKIP_CMDSUBST))
{
int is_help = string_prefixes_string(dir, L"--help") || string_prefixes_string(dir, L"-h");
if( !is_help && ! path_can_get_cdpath(dir))
{
color[ tok_get_pos( &tok ) ] = HIGHLIGHT_ERROR;
}
}
}
highlight_param( param,
&color[tok_get_pos( &tok )],
pos-tok_get_pos( &tok ),
error );
}
else
{
prev_argc=0;
/*
Command. First check that the command actually exists.
*/
cmd = tok_last( &tok );
bool expanded = expand_one(cmd, EXPAND_SKIP_CMDSUBST | EXPAND_SKIP_VARIABLES);
if (! expanded || has_expand_reserved(cmd.c_str()))
{
color[ tok_get_pos( &tok ) ] = HIGHLIGHT_ERROR;
}
else
{
int is_cmd = 0;
int is_subcommand = 0;
int mark = tok_get_pos( &tok );
color[ tok_get_pos( &tok ) ] = HIGHLIGHT_COMMAND;
if( parser_keywords_is_subcommand( cmd ) )
{
int sw;
if( cmd == L"builtin")
{
use_function = 0;
use_command = 0;
use_builtin = 1;
}
else if( cmd == L"command")
{
use_command = 1;
use_function = 0;
use_builtin = 0;
}
tok_next( &tok );
sw = parser_keywords_is_switch( tok_last( &tok ) );
if( !parser_keywords_is_block( cmd ) &&
sw == ARG_SWITCH )
{
/*
The 'builtin' and 'command' builtins
are normally followed by another
command, but if they are invoked
with a switch, they aren't.
*/
use_command = 1;
use_function = 1;
use_builtin = 2;
}
else
{
if( sw == ARG_SKIP )
{
color[ tok_get_pos( &tok ) ] = HIGHLIGHT_PARAM;
mark = tok_get_pos( &tok );
}
is_subcommand = 1;
}
tok_set_pos( &tok, mark );
}
if( !is_subcommand )
{
/*
OK, this is a command, it has been
successfully expanded and everything
looks ok. Lets check if the command
exists.
*/
/*
First check if it is a builtin or
function, since we don't have to stat
any files for that
*/
if( use_builtin )
is_cmd |= builtin_exists( cmd );
if( use_function )
is_cmd |= function_exists_no_autoload( cmd.c_str(), vars );
/*
Moving on to expensive tests
*/
/*
Check if this is a regular command
*/
if( use_command )
{
wcstring tmp;
is_cmd |= !!path_get_path_string( cmd, tmp, vars );
}
if( is_cmd )
{
color[ tok_get_pos( &tok ) ] = HIGHLIGHT_COMMAND;
}
else
{
if( error ) {
error->push_back(format_string(L"Unknown command \'%ls\'", cmd.c_str()));
}
color[ tok_get_pos( &tok ) ] = (HIGHLIGHT_ERROR);
}
had_cmd = 1;
}
if( had_cmd )
{
last_cmd = tok_last( &tok );
}
}
}
break;
}
case TOK_REDIRECT_NOCLOB:
case TOK_REDIRECT_OUT:
case TOK_REDIRECT_IN:
case TOK_REDIRECT_APPEND:
case TOK_REDIRECT_FD:
{
if( !had_cmd )
{
color[ tok_get_pos( &tok ) ] = HIGHLIGHT_ERROR;
if( error )
error->push_back(L"Redirection without a command");
break;
}
wcstring target_str;
const wchar_t *target=NULL;
color[ tok_get_pos( &tok ) ] = HIGHLIGHT_REDIRECTION;
tok_next( &tok );
/*
Check that we are redirecting into a file
*/
switch( tok_last_type( &tok ) )
{
case TOK_STRING:
{
target_str = tok_last( &tok );
if (expand_one(target_str, EXPAND_SKIP_CMDSUBST)) {
target = target_str.c_str();
}
/*
Redirect filename may contain a cmdsubst.
If so, it will be ignored/not flagged.
*/
}
break;
default:
{
color[ tok_get_pos( &tok ) ] = HIGHLIGHT_ERROR;
if( error )
error->push_back(L"Invalid redirection");
}
}
if( target != 0 )
{
wcstring dir = target;
size_t slash_idx = dir.find_last_of(L'/');
struct stat buff;
/*
If file is in directory other than '.', check
that the directory exists.
*/
if( slash_idx != wcstring::npos )
{
dir.resize(slash_idx);
if( wstat( dir.c_str(), &buff ) == -1 )
{
color[ tok_get_pos( &tok ) ] = HIGHLIGHT_ERROR;
if( error )
error->push_back(format_string(L"Directory \'%ls\' does not exist", dir.c_str()));
}
}
/*
If the file is read from or appended to, check
if it exists.
*/
if( last_type == TOK_REDIRECT_IN ||
last_type == TOK_REDIRECT_APPEND )
{
if( wstat( target, &buff ) == -1 )
{
color[ tok_get_pos( &tok ) ] = HIGHLIGHT_ERROR;
if( error )
error->push_back(format_string(L"File \'%ls\' does not exist", target));
}
}
if( last_type == TOK_REDIRECT_NOCLOB )
{
if( wstat( target, &buff ) != -1 )
{
color[ tok_get_pos( &tok ) ] = HIGHLIGHT_ERROR;
if( error )
error->push_back(format_string(L"File \'%ls\' exists", target));
}
}
}
break;
}
case TOK_PIPE:
case TOK_BACKGROUND:
{
if( had_cmd )
{
color[ tok_get_pos( &tok ) ] = HIGHLIGHT_END;
had_cmd = 0;
use_command = 1;
use_function = 1;
use_builtin = 1;
accept_switches = 1;
}
else
{
color[ tok_get_pos( &tok ) ] = HIGHLIGHT_ERROR;
if( error )
error->push_back(L"No job to put in background" );
}
break;
}
case TOK_END:
{
color[ tok_get_pos( &tok ) ] = HIGHLIGHT_END;
had_cmd = 0;
use_command = 1;
use_function = 1;
use_builtin = 1;
accept_switches = 1;
break;
}
case TOK_COMMENT:
{
color[ tok_get_pos( &tok ) ] = HIGHLIGHT_COMMENT;
break;
}
case TOK_ERROR:
default:
{
/*
If the tokenizer reports an error, highlight it as such.
*/
if( error )
error->push_back(tok_last( &tok));
color[ tok_get_pos( &tok ) ] = HIGHLIGHT_ERROR;
break;
}
}
}
tok_destroy( &tok );
}
// PCA DOES_IO (calls is_potential_path, path_get_path, maybe others)
void highlight_shell( const wchar_t * const buff, int *color, int pos, wcstring_list_t *error, const env_vars &vars )
{
ASSERT_IS_BACKGROUND_THREAD();
int i;
int len;
int last_val;
CHECK( buff, );
CHECK( color, );
len = wcslen(buff);
if( !len )
return;
for( i=0; buff[i] != 0; i++ )
color[i] = -1;
/* Tokenize the string */
tokenize(buff, color, pos, error, vars);
/*
Locate and syntax highlight cmdsubsts recursively
*/
wchar_t * const subbuff = wcsdup(buff);
wchar_t * subpos = subbuff;
int done=0;
while( 1 )
{
wchar_t *begin, *end;
if( parse_util_locate_cmdsubst(subpos, &begin, &end, 1) <= 0)
{
break;
}
if( !*end )
done=1;
else
*end=0;
highlight_shell( begin+1, color + (begin-subbuff)+1, -1, error, vars );
color[end-subbuff]=HIGHLIGHT_OPERATOR;
if( done )
break;
subpos = end+1;
}
free(subbuff);
/*
The highlighting code only changes the first element when the
color changes. This fills in the rest.
*/
last_val=0;
for( i=0; buff[i] != 0; i++ )
{
if( color[i] >= 0 )
last_val = color[i];
else
color[i] = last_val;
}
/*
Color potentially valid paths in a special path color if they
are the current token.
*/
if( pos >= 0 && pos <= len )
{
const wchar_t *tok_begin, *tok_end;
parse_util_token_extent( buff, pos, &tok_begin, &tok_end, 0, 0 );
if( tok_begin && tok_end )
{
const wcstring token(tok_begin, tok_end-tok_begin);
if( is_potential_path( token ) )
{
for( i=tok_begin-buff; i < (tok_end-buff); i++ )
{
color[i] |= HIGHLIGHT_VALID_PATH;
}
}
}
}
highlight_universal_internal( buff, color, pos );
/*
Spaces should not be highlighted at all, since it makes cursor look funky in some terminals
*/
for( i=0; buff[i]; i++ )
{
if( iswspace(buff[i]) )
{
color[i]=0;
}
}
}
/**
Perform quote and parenthesis highlighting on the specified string.
*/
static void highlight_universal_internal( const wchar_t * buff,
int *color,
int pos )
{
if( (pos >= 0) && ((size_t)pos < wcslen(buff)) )
{
/*
Highlight matching quotes
*/
if( (buff[pos] == L'\'') || (buff[pos] == L'\"') )
{
std::deque<long> lst;
int level=0;
wchar_t prev_q=0;
const wchar_t *str=buff;
int match_found=0;
while(*str)
{
switch( *str )
{
case L'\\':
str++;
break;
case L'\"':
case L'\'':
if( level == 0 )
{
level++;
lst.push_back((long)(str-buff));
prev_q = *str;
}
else
{
if( prev_q == *str )
{
long pos1, pos2;
level--;
pos1 = lst.back();
pos2 = str-buff;
if( pos1==pos || pos2==pos )
{
color[pos1]|=HIGHLIGHT_MATCH<<16;
color[pos2]|=HIGHLIGHT_MATCH<<16;
match_found = 1;
}
prev_q = *str==L'\"'?L'\'':L'\"';
}
else
{
level++;
lst.push_back((long)(str-buff));
prev_q = *str;
}
}
break;
}
if( (*str == L'\0'))
break;
str++;
}
if( !match_found )
color[pos] = HIGHLIGHT_ERROR<<16;
}
/*
Highlight matching parenthesis
*/
if( wcschr( L"()[]{}", buff[pos] ) )
{
int step = wcschr(L"({[", buff[pos])?1:-1;
wchar_t dec_char = *(wcschr( L"()[]{}", buff[pos] ) + step);
wchar_t inc_char = buff[pos];
int level = 0;
const wchar_t *str = &buff[pos];
int match_found=0;
while( (str >= buff) && *str)
{
if( *str == inc_char )
level++;
if( *str == dec_char )
level--;
if( level == 0 )
{
int pos2 = str-buff;
color[pos]|=HIGHLIGHT_MATCH<<16;
color[pos2]|=HIGHLIGHT_MATCH<<16;
match_found=1;
break;
}
str+= step;
}
if( !match_found )
color[pos] = HIGHLIGHT_ERROR<<16;
}
}
}
void highlight_universal( const wchar_t *buff, int *color, int pos, wcstring_list_t *error, const env_vars &vars )
{
int i;
for( i=0; buff[i]; i++ )
color[i] = 0;
highlight_universal_internal( buff, color, pos );
}
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