mirror of
https://github.com/fish-shell/fish-shell
synced 2024-12-25 12:23:09 +00:00
692 lines
11 KiB
C
692 lines
11 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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*/
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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 <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 "wildcard.h"
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#include "halloc_util.h"
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/**
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Set of files which have been autoloaded
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*/
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static hash_table_t *all_loaded=0;
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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 const 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 const 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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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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const 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 = 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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res++;
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}
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return res;
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}
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int parse_util_locate_cmdsubst( const wchar_t *in,
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const wchar_t **begin,
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const wchar_t **end,
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int allow_incomplete )
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{
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const 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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const wchar_t *paran_begin=0, *paran_end=0;
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for( pos=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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const wchar_t *end = quote_end( pos );
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if( end && *end)
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{
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pos=end;
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}
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else
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break;
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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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paran_begin = pos;
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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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*begin = paran_begin;
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if( end )
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*end = paran_count?in+wcslen(in):paran_end;
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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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const wchar_t *begin, *end;
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const wchar_t *pos;
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if( a )
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*a=0;
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if( b )
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*b = 0;
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if( !buff )
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return;
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pos = buff;
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while( 1 )
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{
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int bc, ec;
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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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begin=buff;
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end = buff + wcslen(buff);
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break;
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}
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if( !end )
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{
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end = buff + wcslen(buff);
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}
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bc = begin-buff;
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ec = end-buff;
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if(( bc < cursor_pos ) && (ec >= cursor_pos) )
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{
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begin++;
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break;
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}
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pos = end+1;
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}
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if( a )
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*a = begin;
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if( b )
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*b = end;
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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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if( a )
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*a=0;
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if( b )
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*b = 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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return;
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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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if( !process )
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break;
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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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*b = buff + tok_begin;
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}
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else
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{
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if( a )
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*a = buff + tok_begin+1;
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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, *b, *pa, *pb;
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a = b = pa = pb = 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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return;
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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 );
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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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tok_end +=wcslen(tok_last(&tok));
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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 = 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_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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// fwprintf( stderr, L"Whee %ls\n", *a );
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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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*tok_begin = a;
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if( tok_end )
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*tok_end = b;
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if( prev_begin )
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*prev_begin = pa;
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if( prev_end )
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*prev_end = pb;
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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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/**
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Free hash value, but not hash key
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*/
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static void clear_hash_value( const void *key, const void *data )
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{
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free( (void *)data );
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}
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/**
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Part of the autoloader cleanup
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*/
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static void clear_loaded_entry( const void *key, const void *data )
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{
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hash_table_t *loaded = (hash_table_t *)data;
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hash_foreach( loaded,
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&clear_hash_value );
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hash_destroy( loaded );
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free( loaded );
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free( (void *)key );
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}
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/**
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The autoloader cleanup function. It is run on shutdown and frees
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any memory used by the autoloader code to keep track of loaded
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files.
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*/
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static void parse_util_destroy()
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{
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if( all_loaded )
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{
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hash_foreach( all_loaded,
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&clear_loaded_entry );
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hash_destroy( all_loaded );
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free( all_loaded );
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all_loaded = 0;
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}
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}
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void parse_util_load_reset( const wchar_t *path_var )
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{
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if( all_loaded )
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{
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void *key, *data;
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hash_remove( all_loaded, path_var, (const void **)&key, (const void **)&data );
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if( key )
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clear_loaded_entry( key, data );
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}
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}
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int parse_util_load( const wchar_t *cmd,
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const wchar_t *path_var_name,
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void (*on_load)(const wchar_t *cmd),
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int reload )
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{
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static array_list_t *path_list=0;
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static string_buffer_t *path=0;
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int i;
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time_t *tm;
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int reloaded = 0;
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hash_table_t *loaded;
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const wchar_t *path_var = env_get( path_var_name );
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/*
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Do we know where to look
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*/
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if( !path_var )
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return 0;
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if( !all_loaded )
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{
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all_loaded = malloc( sizeof( hash_table_t ) );
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halloc_register_function_void( global_context, &parse_util_destroy );
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if( !all_loaded )
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{
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die_mem();
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}
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hash_init( all_loaded, &hash_wcs_func, &hash_wcs_cmp );
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}
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loaded = (hash_table_t *)hash_get( all_loaded, path_var_name );
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if( !loaded )
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{
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loaded = malloc( sizeof( hash_table_t ) );
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if( !loaded )
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{
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die_mem();
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}
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hash_init( loaded, &hash_wcs_func, &hash_wcs_cmp );
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hash_put( all_loaded, wcsdup(path_var_name), loaded );
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}
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/*
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Get modification time of file
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*/
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tm = (time_t *)hash_get( loaded, cmd );
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/*
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Did we just check this?
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*/
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if( tm )
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{
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if(time(0)-tm[1]<=1)
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{
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return 0;
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}
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}
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/*
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Return if already loaded and we are skipping reloading
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*/
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if( !reload && tm )
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return 0;
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if( !path_list )
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path_list = al_halloc( global_context);
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if( !path )
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path = sb_halloc( global_context );
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else
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sb_clear( path );
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expand_variable_array( path_var, path_list );
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/*
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Iterate over path searching for suitable completion files
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*/
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for( i=0; i<al_get_count( path_list ); i++ )
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{
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struct stat buf;
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wchar_t *next = (wchar_t *)al_get( path_list, i );
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sb_clear( path );
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sb_append2( path, next, L"/", cmd, L".fish", (void *)0 );
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if( (wstat( (wchar_t *)path->buff, &buf )== 0) &&
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(waccess( (wchar_t *)path->buff, R_OK ) == 0) )
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{
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if( !tm || (tm[0] != buf.st_mtime ) )
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{
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wchar_t *esc = escape( (wchar_t *)path->buff, 1 );
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wchar_t *src_cmd = wcsdupcat( L". ", esc );
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if( !tm )
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{
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tm = malloc(sizeof(time_t)*2);
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if( !tm )
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die_mem();
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}
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tm[0] = buf.st_mtime;
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tm[1] = time(0);
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hash_put( loaded,
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intern( cmd ),
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tm );
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free( esc );
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if( on_load )
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on_load(cmd );
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/*
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Source the completion file for the specified completion
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*/
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exec_subshell( src_cmd, 0 );
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free(src_cmd);
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reloaded = 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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If no file was found we insert the current time. Later we only
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research if the current time is at least five seconds later.
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This way, the files won't be searched over and over again.
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*/
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if( !tm )
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{
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tm = malloc(sizeof(time_t)*2);
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if( !tm )
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die_mem();
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tm[0] = 0;
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tm[1] = time(0);
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hash_put( loaded, intern( cmd ), tm );
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}
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al_foreach( path_list, (void (*)(const void *))&free );
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al_truncate( path_list, 0 );
|
|
|
|
return reloaded;
|
|
}
|
|
|
|
void parse_util_set_argv( wchar_t **argv )
|
|
{
|
|
if( *argv )
|
|
{
|
|
wchar_t **arg;
|
|
string_buffer_t sb;
|
|
sb_init( &sb );
|
|
|
|
for( arg=argv; *arg; arg++ )
|
|
{
|
|
if( arg != argv )
|
|
sb_append( &sb, ARRAY_SEP_STR );
|
|
sb_append( &sb, *arg );
|
|
}
|
|
|
|
env_set( L"argv", (wchar_t *)sb.buff, ENV_LOCAL );
|
|
sb_destroy( &sb );
|
|
}
|
|
else
|
|
{
|
|
env_set( L"argv", 0, ENV_LOCAL );
|
|
}
|
|
}
|
|
|
|
wchar_t *parse_util_unescape_wildcards( const wchar_t *str )
|
|
{
|
|
wchar_t *in, *out;
|
|
wchar_t *unescaped = wcsdup(str);
|
|
|
|
if( !unescaped )
|
|
die_mem();
|
|
|
|
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;
|
|
}
|
|
|