mirror of
https://github.com/fish-shell/fish-shell.git
synced 2024-11-22 20:16:12 +08:00
796 lines
16 KiB
C++
796 lines
16 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, size_t offset)
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{
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if (! str)
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return 0;
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int res = 1;
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for (size_t i=0; str[i] && i<offset; 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, size_t pos)
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{
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const wchar_t *buff = str.c_str();
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int count = 0;
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for (size_t 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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size_t 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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size_t i;
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int count = 0;
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if (line < 0)
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{
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return (size_t)(-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)<str.size()?i+1:i;
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}
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}
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}
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}
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size_t parse_util_get_offset(const wcstring &str, int line, long line_offset)
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{
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const wchar_t *buff = str.c_str();
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size_t off = parse_util_get_offset_from_line(buff, line);
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size_t off2 = parse_util_get_offset_from_line(buff, line+1);
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long line_offset2 = line_offset;
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if (off == (size_t)(-1))
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{
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return -1;
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}
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if (off2 == (size_t)(-1))
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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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size_t 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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size_t 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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long pos;
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wchar_t *buffcpy;
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int finished=0;
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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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tokenizer_t tok(buffcpy, TOK_ACCEPT_UNFINISHED);
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for (; tok_has_next(&tok) && !finished; 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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}
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void parse_util_process_extent(const wchar_t *buff,
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size_t 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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size_t 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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size_t 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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long pos;
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wchar_t *buffcpy;
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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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tokenizer_t tok(buffcpy, TOK_ACCEPT_UNFINISHED | TOK_SQUASH_ERRORS);
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for (; tok_has_next(&tok); tok_next(&tok))
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{
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size_t tok_begin = tok_get_pos(&tok);
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size_t 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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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.empty())
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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++)
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{
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switch (*in)
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{
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case L'\\':
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{
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switch (*(in + 1))
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{
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case L'*':
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case L'?':
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{
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in++;
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*(out++)=*in;
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break;
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}
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case L'\\':
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{
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in++;
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*(out++)=L'\\';
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*(out++)=L'\\';
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break;
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}
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default:
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{
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*(out++)=*in;
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break;
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}
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}
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break;
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}
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case L'*':
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{
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*(out++)=ANY_STRING;
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break;
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}
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case L'?':
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{
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*(out++)=ANY_CHAR;
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break;
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}
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default:
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{
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*(out++)=*in;
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break;
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}
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}
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}
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*out = *in;
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return unescaped;
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}
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/**
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Find the outermost quoting style of current token. Returns 0 if
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token is not quoted.
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*/
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static wchar_t get_quote(const wchar_t *cmd, size_t len)
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{
|
|
size_t i=0;
|
|
wchar_t res=0;
|
|
|
|
while (1)
|
|
{
|
|
if (!cmd[i])
|
|
break;
|
|
|
|
if (cmd[i] == L'\\')
|
|
{
|
|
i++;
|
|
if (!cmd[i])
|
|
break;
|
|
i++;
|
|
}
|
|
else
|
|
{
|
|
if (cmd[i] == L'\'' || cmd[i] == L'\"')
|
|
{
|
|
const wchar_t *end = quote_end(&cmd[i]);
|
|
//fwprintf( stderr, L"Jump %d\n", end-cmd );
|
|
if ((end == 0) || (!*end) || (end-cmd > len))
|
|
{
|
|
res = cmd[i];
|
|
break;
|
|
}
|
|
i = end-cmd+1;
|
|
}
|
|
else
|
|
i++;
|
|
}
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
void parse_util_get_parameter_info(const wcstring &cmd, const size_t pos, wchar_t *quote, size_t *offset, int *type)
|
|
{
|
|
size_t prev_pos=0;
|
|
wchar_t last_quote = '\0';
|
|
int unfinished;
|
|
|
|
tokenizer_t tok(cmd.c_str(), TOK_ACCEPT_UNFINISHED | TOK_SQUASH_ERRORS);
|
|
for (; tok_has_next(&tok); tok_next(&tok))
|
|
{
|
|
if (tok_get_pos(&tok) > pos)
|
|
break;
|
|
|
|
if (tok_last_type(&tok) == TOK_STRING)
|
|
last_quote = get_quote(tok_last(&tok),
|
|
pos - tok_get_pos(&tok));
|
|
|
|
if (type != NULL)
|
|
*type = tok_last_type(&tok);
|
|
|
|
prev_pos = tok_get_pos(&tok);
|
|
}
|
|
|
|
wchar_t *cmd_tmp = wcsdup(cmd.c_str());
|
|
cmd_tmp[pos]=0;
|
|
size_t cmdlen = wcslen(cmd_tmp);
|
|
unfinished = (cmdlen==0);
|
|
if (!unfinished)
|
|
{
|
|
unfinished = (quote != 0);
|
|
|
|
if (!unfinished)
|
|
{
|
|
if (wcschr(L" \t\n\r", cmd_tmp[cmdlen-1]) != 0)
|
|
{
|
|
if ((cmdlen == 1) || (cmd_tmp[cmdlen-2] != L'\\'))
|
|
{
|
|
unfinished=1;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (quote)
|
|
*quote = last_quote;
|
|
|
|
if (offset != 0)
|
|
{
|
|
if (!unfinished)
|
|
{
|
|
while ((cmd_tmp[prev_pos] != 0) && (wcschr(L";|",cmd_tmp[prev_pos])!= 0))
|
|
prev_pos++;
|
|
|
|
*offset = prev_pos;
|
|
}
|
|
else
|
|
{
|
|
*offset = pos;
|
|
}
|
|
}
|
|
free(cmd_tmp);
|
|
}
|
|
|
|
wcstring parse_util_escape_string_with_quote(const wcstring &cmd, wchar_t quote)
|
|
{
|
|
wcstring result;
|
|
if (quote == L'\0')
|
|
{
|
|
result = escape_string(cmd, ESCAPE_ALL | ESCAPE_NO_QUOTED | ESCAPE_NO_TILDE);
|
|
}
|
|
else
|
|
{
|
|
bool unescapable = false;
|
|
for (size_t i = 0; i < cmd.size(); i++)
|
|
{
|
|
wchar_t c = cmd.at(i);
|
|
switch (c)
|
|
{
|
|
case L'\n':
|
|
case L'\t':
|
|
case L'\b':
|
|
case L'\r':
|
|
unescapable = true;
|
|
break;
|
|
default:
|
|
if (c == quote)
|
|
result.push_back(L'\\');
|
|
result.push_back(c);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (unescapable)
|
|
{
|
|
result = escape_string(cmd, ESCAPE_ALL | ESCAPE_NO_QUOTED);
|
|
result.insert(0, "e, 1);
|
|
}
|
|
}
|
|
return result;
|
|
}
|