mirror of
https://github.com/fish-shell/fish-shell.git
synced 2024-11-25 09:39:52 +08:00
694 lines
9.9 KiB
C++
694 lines
9.9 KiB
C++
/** \file parse_util.c
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Various mostly unrelated utility functions related to parsing,
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loading and evaluating fish code.
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This library can be seen as a 'toolbox' for functions that are
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used in many places in fish and that are somehow related to
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parsing the code.
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*/
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#include "config.h"
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#include <stdlib.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <wctype.h>
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#include <wchar.h>
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#include <map>
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#include <set>
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#include <algorithm>
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#include <time.h>
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#include <assert.h>
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#include "fallback.h"
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#include "util.h"
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#include "wutil.h"
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#include "common.h"
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#include "tokenizer.h"
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#include "parse_util.h"
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#include "expand.h"
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#include "intern.h"
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#include "exec.h"
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#include "env.h"
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#include "signal.h"
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#include "wildcard.h"
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/**
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Maximum number of autoloaded items opf a specific type to keep in
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memory at a time.
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*/
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#define AUTOLOAD_MAX 10
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/**
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Minimum time, in seconds, before an autoloaded item will be
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unloaded
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*/
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#define AUTOLOAD_MIN_AGE 60
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int parse_util_lineno( const wchar_t *str, int len )
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{
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/**
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First cached state
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*/
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static wchar_t *prev_str = 0;
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static int i=0;
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static int res = 1;
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/**
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Second cached state
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*/
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static wchar_t *prev_str2 = 0;
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static int i2 = 0;
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static int res2 = 1;
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CHECK( str, 0 );
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if( str != prev_str || i>len )
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{
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if( prev_str2 == str && i2 <= len )
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{
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wchar_t *tmp_str = prev_str;
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int tmp_i = i;
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int tmp_res = res;
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prev_str = prev_str2;
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i=i2;
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res=res2;
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prev_str2 = tmp_str;
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i2 = tmp_i;
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res2 = tmp_res;
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}
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else
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{
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prev_str2 = prev_str;
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i2 = i;
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res2=res;
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prev_str = (wchar_t *)str;
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i=0;
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res=1;
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}
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}
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for( ; str[i] && i<len; i++ )
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{
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if( str[i] == L'\n' )
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{
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res++;
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}
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}
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return res;
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}
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int parse_util_get_line_from_offset( const wcstring &str, int pos )
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{
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// return parse_util_lineno( buff, pos );
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const wchar_t *buff = str.c_str();
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int i;
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int count = 0;
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if( pos < 0 )
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{
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return -1;
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}
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for( i=0; i<pos; i++ )
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{
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if( !buff[i] )
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{
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return -1;
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}
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if( buff[i] == L'\n' )
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{
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count++;
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}
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}
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return count;
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}
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int parse_util_get_offset_from_line( const wcstring &str, int line )
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{
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const wchar_t *buff = str.c_str();
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int i;
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int count = 0;
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if( line < 0 )
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{
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return -1;
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}
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if( line == 0 )
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return 0;
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for( i=0;; i++ )
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{
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if( !buff[i] )
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{
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return -1;
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}
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if( buff[i] == L'\n' )
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{
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count++;
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if( count == line )
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{
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return i+1;
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}
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}
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}
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}
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int parse_util_get_offset( const wcstring &str, int line, int line_offset )
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{
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const wchar_t *buff = str.c_str();
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int off = parse_util_get_offset_from_line( buff, line );
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int off2 = parse_util_get_offset_from_line( buff, line+1 );
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int line_offset2 = line_offset;
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if( off < 0 )
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{
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return -1;
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}
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if( off2 < 0 )
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{
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off2 = wcslen( buff )+1;
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}
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if( line_offset2 < 0 )
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{
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line_offset2 = 0;
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}
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if( line_offset2 >= off2-off-1 )
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{
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line_offset2 = off2-off-1;
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}
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return off + line_offset2;
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}
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int parse_util_locate_cmdsubst( const wchar_t *in,
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wchar_t **begin,
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wchar_t **end,
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int allow_incomplete )
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{
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wchar_t *pos;
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wchar_t prev=0;
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int syntax_error=0;
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int paran_count=0;
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wchar_t *paran_begin=0, *paran_end=0;
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CHECK( in, 0 );
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for( pos = (wchar_t *)in; *pos; pos++ )
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{
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if( prev != '\\' )
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{
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if( wcschr( L"\'\"", *pos ) )
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{
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wchar_t *q_end = quote_end( pos );
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if( q_end && *q_end)
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{
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pos=q_end;
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}
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else
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{
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break;
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}
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}
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else
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{
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if( *pos == '(' )
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{
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if(( paran_count == 0)&&(paran_begin==0))
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{
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paran_begin = pos;
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}
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paran_count++;
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}
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else if( *pos == ')' )
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{
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paran_count--;
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if( (paran_count == 0) && (paran_end == 0) )
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{
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paran_end = pos;
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break;
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}
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if( paran_count < 0 )
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{
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syntax_error = 1;
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break;
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}
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}
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}
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}
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prev = *pos;
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}
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syntax_error |= (paran_count < 0 );
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syntax_error |= ((paran_count>0)&&(!allow_incomplete));
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if( syntax_error )
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{
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return -1;
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}
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if( paran_begin == 0 )
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{
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return 0;
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}
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if( begin )
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{
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*begin = paran_begin;
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}
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if( end )
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{
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*end = paran_count?(wchar_t *)in+wcslen(in):paran_end;
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}
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return 1;
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}
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void parse_util_cmdsubst_extent( const wchar_t *buff,
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int cursor_pos,
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const wchar_t **a,
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const wchar_t **b )
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{
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wchar_t *begin, *end;
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wchar_t *pos;
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const wchar_t *cursor = buff + cursor_pos;
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CHECK( buff, );
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if( a )
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{
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*a = (wchar_t *)buff;
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}
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if( b )
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{
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*b = (wchar_t *)buff+wcslen(buff);
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}
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pos = (wchar_t *)buff;
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while( 1 )
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{
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if( parse_util_locate_cmdsubst( pos,
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&begin,
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&end,
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1 ) <= 0)
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{
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/*
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No subshell found
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*/
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break;
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}
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if( !end )
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{
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end = (wchar_t *)buff + wcslen(buff);
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}
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if(( begin < cursor ) && (end >= cursor) )
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{
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begin++;
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if( a )
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{
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*a = begin;
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}
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if( b )
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{
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*b = end;
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}
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break;
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}
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if( !*end )
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{
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break;
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}
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pos = end+1;
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}
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}
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/**
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Get the beginning and end of the job or process definition under the cursor
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*/
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static void job_or_process_extent( const wchar_t *buff,
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int cursor_pos,
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const wchar_t **a,
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const wchar_t **b,
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int process )
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{
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const wchar_t *begin, *end;
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int pos;
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wchar_t *buffcpy;
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int finished=0;
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tokenizer tok;
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CHECK( buff, );
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if( a )
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{
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*a=0;
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}
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if( b )
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{
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*b = 0;
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}
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parse_util_cmdsubst_extent( buff, cursor_pos, &begin, &end );
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if( !end || !begin )
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{
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return;
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}
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pos = cursor_pos - (begin - buff);
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if( a )
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{
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*a = begin;
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}
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if( b )
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{
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*b = end;
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}
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buffcpy = wcsndup( begin, end-begin );
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if( !buffcpy )
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{
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DIE_MEM();
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}
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for( tok_init( &tok, buffcpy, TOK_ACCEPT_UNFINISHED );
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tok_has_next( &tok ) && !finished;
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tok_next( &tok ) )
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{
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int tok_begin = tok_get_pos( &tok );
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switch( tok_last_type( &tok ) )
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{
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case TOK_PIPE:
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{
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if( !process )
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{
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break;
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}
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}
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case TOK_END:
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case TOK_BACKGROUND:
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{
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if( tok_begin >= pos )
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{
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finished=1;
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if( b )
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{
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*b = (wchar_t *)buff + tok_begin;
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}
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}
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else
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{
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if( a )
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{
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*a = (wchar_t *)buff + tok_begin+1;
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}
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}
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break;
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}
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}
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}
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free( buffcpy);
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tok_destroy( &tok );
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}
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void parse_util_process_extent( const wchar_t *buff,
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int pos,
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const wchar_t **a,
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const wchar_t **b )
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{
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job_or_process_extent( buff, pos, a, b, 1 );
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}
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void parse_util_job_extent( const wchar_t *buff,
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int pos,
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const wchar_t **a,
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const wchar_t **b )
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{
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job_or_process_extent( buff,pos,a, b, 0 );
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}
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void parse_util_token_extent( const wchar_t *buff,
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int cursor_pos,
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const wchar_t **tok_begin,
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const wchar_t **tok_end,
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const wchar_t **prev_begin,
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const wchar_t **prev_end )
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{
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const wchar_t *begin, *end;
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int pos;
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wchar_t *buffcpy;
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tokenizer tok;
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const wchar_t *a = NULL, *b = NULL, *pa = NULL, *pb = NULL;
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CHECK( buff, );
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assert( cursor_pos >= 0 );
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parse_util_cmdsubst_extent( buff, cursor_pos, &begin, &end );
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if( !end || !begin )
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{
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return;
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}
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pos = cursor_pos - (begin - buff);
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a = buff + pos;
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b = a;
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pa = buff + pos;
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pb = pa;
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assert( begin >= buff );
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assert( begin <= (buff+wcslen(buff) ) );
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assert( end >= begin );
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assert( end <= (buff+wcslen(buff) ) );
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buffcpy = wcsndup( begin, end-begin );
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if( !buffcpy )
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{
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DIE_MEM();
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}
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for( tok_init( &tok, buffcpy, TOK_ACCEPT_UNFINISHED | TOK_SQUASH_ERRORS );
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tok_has_next( &tok );
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tok_next( &tok ) )
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{
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int tok_begin = tok_get_pos( &tok );
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int tok_end=tok_begin;
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/*
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Calculate end of token
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*/
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if( tok_last_type( &tok ) == TOK_STRING )
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{
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tok_end +=wcslen(tok_last(&tok));
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}
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/*
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Cursor was before beginning of this token, means that the
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cursor is between two tokens, so we set it to a zero element
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string and break
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*/
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if( tok_begin > pos )
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{
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a = b = (wchar_t *)buff + pos;
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break;
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}
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/*
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If cursor is inside the token, this is the token we are
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looking for. If so, set a and b and break
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*/
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if( (tok_last_type( &tok ) == TOK_STRING) && (tok_end >= pos ) )
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{
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a = begin + tok_get_pos( &tok );
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b = a + wcslen(tok_last(&tok));
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break;
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}
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/*
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Remember previous string token
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*/
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if( tok_last_type( &tok ) == TOK_STRING )
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{
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pa = begin + tok_get_pos( &tok );
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pb = pa + wcslen(tok_last(&tok));
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}
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}
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free( buffcpy);
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tok_destroy( &tok );
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if( tok_begin )
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{
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*tok_begin = a;
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}
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if( tok_end )
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{
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*tok_end = b;
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}
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if( prev_begin )
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{
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*prev_begin = pa;
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}
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if( prev_end )
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{
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*prev_end = pb;
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}
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assert( pa >= buff );
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assert( pa <= (buff+wcslen(buff) ) );
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assert( pb >= pa );
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assert( pb <= (buff+wcslen(buff) ) );
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}
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void parse_util_set_argv( const wchar_t * const *argv, const wcstring_list_t &named_arguments )
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{
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if( *argv )
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{
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const wchar_t * const *arg;
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wcstring sb;
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for( arg=argv; *arg; arg++ )
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{
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if( arg != argv )
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{
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sb.append(ARRAY_SEP_STR);
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}
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sb.append(*arg);
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}
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env_set( L"argv", sb.c_str(), ENV_LOCAL );
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}
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else
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{
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env_set( L"argv", 0, ENV_LOCAL );
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}
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if( named_arguments.size() )
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{
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const wchar_t * const *arg;
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size_t i;
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for( i=0, arg=argv; i < named_arguments.size(); i++ )
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{
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env_set( named_arguments.at(i).c_str(), *arg, ENV_LOCAL );
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if( *arg )
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arg++;
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}
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}
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}
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wchar_t *parse_util_unescape_wildcards( const wchar_t *str )
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{
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wchar_t *in, *out;
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wchar_t *unescaped;
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CHECK( str, 0 );
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unescaped = wcsdup(str);
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if( !unescaped )
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{
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DIE_MEM();
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}
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|
for( in=out=unescaped; *in; in++ )
|
|
{
|
|
switch( *in )
|
|
{
|
|
case L'\\':
|
|
{
|
|
if( *(in+1) )
|
|
{
|
|
in++;
|
|
*(out++)=*in;
|
|
}
|
|
*(out++)=*in;
|
|
break;
|
|
}
|
|
|
|
case L'*':
|
|
{
|
|
*(out++)=ANY_STRING;
|
|
break;
|
|
}
|
|
|
|
case L'?':
|
|
{
|
|
*(out++)=ANY_CHAR;
|
|
break;
|
|
}
|
|
|
|
default:
|
|
{
|
|
*(out++)=*in;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
return unescaped;
|
|
}
|
|
|