mirror of
https://github.com/fish-shell/fish-shell.git
synced 2024-11-24 04:42:39 +08:00
736 lines
13 KiB
C++
736 lines
13 KiB
C++
/** \file tokenizer.c
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A specialized tokenizer for tokenizing the fish language. In the
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future, the tokenizer should be extended to support marks,
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tokenizing multiple strings and disposing of unused string
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segments.
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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 <wchar.h>
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#include <wctype.h>
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#include <string.h>
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#include <unistd.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 "tokenizer.h"
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#include "common.h"
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/* Wow what a hack */
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#define TOK_CALL_ERROR(t, e, x) do { tok_call_error((t), (e), (t)->squash_errors ? L"" : (x)); } while (0)
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/**
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Error string for unexpected end of string
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*/
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#define QUOTE_ERROR _( L"Unexpected end of string, quotes are not balanced" )
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/**
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Error string for mismatched parenthesis
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*/
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#define PARAN_ERROR _( L"Unexpected end of string, parenthesis do not match" )
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/**
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Error string for invalid redirections
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*/
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#define REDIRECT_ERROR _( L"Invalid input/output redirection" )
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/**
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Error string for when trying to pipe from fd 0
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*/
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#define PIPE_ERROR _( L"Can not use fd 0 as pipe output" )
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/**
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Characters that separate tokens. They are ordered by frequency of occurrence to increase parsing speed.
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*/
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#define SEP L" \n|\t;#\r<>^&"
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/**
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Maximum length of a string containing a file descriptor number
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*/
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#define FD_STR_MAX_LEN 16
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/**
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Descriptions of all tokenizer errors
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*/
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static const wchar_t *tok_desc[] =
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{
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N_(L"Tokenizer not yet initialized"),
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N_( L"Tokenizer error" ),
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N_( L"Invalid token" ),
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N_( L"String" ),
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N_( L"Pipe" ),
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N_( L"End of command" ),
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N_( L"Redirect output to file" ),
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N_( L"Append output to file" ),
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N_( L"Redirect input to file" ),
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N_( L"Redirect to file descriptor" ),
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N_( L"Redirect output to file if file does not exist" ),
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N_( L"Run job in background" ),
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N_( L"Comment" )
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}
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;
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/**
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Tests if the tokenizer buffer is large enough to hold contents of
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the specified length, and if not, reallocates the tokenizer buffer.
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\return 0 if the system could not provide the memory needed, and 1 otherwise.
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*/
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static int check_size( tokenizer *tok, size_t len )
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{
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if( tok->last_len <= len )
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{
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wchar_t *tmp;
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tok->last_len = len +1;
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tmp = (wchar_t *)realloc( tok->last, sizeof(wchar_t)*tok->last_len );
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if( tmp == 0 )
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{
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wperror( L"realloc" );
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return 0;
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}
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tok->last = tmp;
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}
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return 1;
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}
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/**
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Set the latest tokens string to be the specified error message
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*/
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static void tok_call_error( tokenizer *tok, int error_type, const wchar_t *error_message )
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{
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tok->last_type = TOK_ERROR;
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tok->error = error_type;
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if( !check_size( tok, wcslen( error_message)+1 ))
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{
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if( tok->last != 0 )
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*tok->last=0;
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return;
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}
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wcscpy( tok->last, error_message );
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}
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int tok_get_error( tokenizer *tok )
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{
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return tok->error;
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}
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void tok_init( tokenizer *tok, const wchar_t *b, int flags )
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{
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/* We can only generate error messages on the main thread due to wgettext() thread safety issues. */
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if (! (flags & TOK_SQUASH_ERRORS)) {
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ASSERT_IS_MAIN_THREAD();
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}
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CHECK( tok, );
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memset( tok, 0, sizeof( tokenizer) );
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CHECK( b, );
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tok->accept_unfinished = !! (flags & TOK_ACCEPT_UNFINISHED);
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tok->show_comments = !! (flags & TOK_SHOW_COMMENTS);
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tok->squash_errors = !! (flags & TOK_SQUASH_ERRORS);
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tok->has_next=1;
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tok->has_next = (*b != L'\0');
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tok->orig_buff = tok->buff = b;
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tok_next( tok );
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}
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void tok_destroy( tokenizer *tok )
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{
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CHECK( tok, );
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free( tok->last );
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if( tok->free_orig )
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free( (void *)tok->orig_buff );
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}
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int tok_last_type( tokenizer *tok )
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{
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CHECK( tok, TOK_ERROR );
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CHECK( tok->buff, TOK_ERROR );
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return tok->last_type;
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}
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wchar_t *tok_last( tokenizer *tok )
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{
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CHECK( tok, 0 );
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return tok->last;
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}
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int tok_has_next( tokenizer *tok )
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{
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/*
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Return 1 on broken tokenizer
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*/
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CHECK( tok, 1 );
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CHECK( tok->buff, 1 );
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/* fwprintf( stderr, L"has_next is %ls \n", tok->has_next?L"true":L"false" );*/
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return tok->has_next;
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}
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/**
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Tests if this character can be a part of a string
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*/
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static int is_string_char( wchar_t c )
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{
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return !( !c || wcschr( SEP, c ) );
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}
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/**
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Quick test to catch the most common 'non-magical' characters, makes
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read_string slightly faster by adding a fast path for the most
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common characters. This is obviously not a suitable replacement for
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iswalpha.
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*/
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static int myal( wchar_t c )
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{
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return (c>=L'a' && c<=L'z') || (c>=L'A'&&c<=L'Z');
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}
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/**
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Read the next token as a string
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*/
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static void read_string( tokenizer *tok )
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{
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const wchar_t *start;
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int len;
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int mode=0;
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int do_loop=1;
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int paran_count=0;
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start = tok->buff;
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while( 1 )
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{
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if( !myal( *tok->buff ) )
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{
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// debug(1, L"%lc", *tok->buff );
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if( *tok->buff == L'\\' )
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{
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tok->buff++;
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if( *tok->buff == L'\0' )
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{
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if( (!tok->accept_unfinished) )
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{
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TOK_CALL_ERROR( tok, TOK_UNTERMINATED_ESCAPE, QUOTE_ERROR );
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return;
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}
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else
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{
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do_loop = 0;
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}
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}
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else if( *tok->buff == L'\n' && mode == 0)
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{
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tok->buff--;
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do_loop = 0;
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break;
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}
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tok->buff++;
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continue;
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}
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/*
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The modes are as follows:
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0: regular text
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1: inside of subshell
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2: inside of array brackets
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3: inside of array brackets and subshell, like in '$foo[(ech'
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*/
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switch( mode )
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{
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case 0:
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{
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switch( *tok->buff )
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{
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case L'(':
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{
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paran_count=1;
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mode = 1;
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break;
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}
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case L'[':
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{
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if( tok->buff != start )
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mode=2;
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break;
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}
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case L'\'':
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case L'"':
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{
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const wchar_t *end = quote_end( tok->buff );
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tok->last_quote = *tok->buff;
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if( end )
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{
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tok->buff=(wchar_t *)end;
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}
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else
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{
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tok->buff += wcslen( tok->buff );
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if( (!tok->accept_unfinished) )
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{
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TOK_CALL_ERROR( tok, TOK_UNTERMINATED_QUOTE, QUOTE_ERROR );
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return;
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}
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do_loop = 0;
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}
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break;
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}
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default:
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{
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if( !is_string_char(*(tok->buff)) )
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{
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do_loop=0;
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}
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}
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}
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break;
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}
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case 3:
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case 1:
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switch( *tok->buff )
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{
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case L'\'':
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case L'\"':
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{
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const wchar_t *end = quote_end( tok->buff );
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if( end )
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{
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tok->buff=(wchar_t *)end;
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}
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else
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{
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tok->buff += wcslen( tok->buff );
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if( (!tok->accept_unfinished) )
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{
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TOK_CALL_ERROR( tok, TOK_UNTERMINATED_QUOTE, QUOTE_ERROR );
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return;
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}
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do_loop = 0;
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}
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break;
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}
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case L'(':
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paran_count++;
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break;
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case L')':
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paran_count--;
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if( paran_count == 0 )
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{
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mode--;
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}
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break;
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case L'\0':
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do_loop = 0;
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break;
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}
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break;
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case 2:
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switch( *tok->buff )
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{
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case L'(':
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paran_count=1;
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mode = 3;
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break;
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case L']':
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mode=0;
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break;
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case L'\0':
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do_loop = 0;
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break;
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}
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break;
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}
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}
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if( !do_loop )
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break;
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tok->buff++;
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}
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if( (!tok->accept_unfinished) && (mode!=0) )
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{
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TOK_CALL_ERROR( tok, TOK_UNTERMINATED_SUBSHELL, PARAN_ERROR );
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return;
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}
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len = tok->buff - start;
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if( !check_size( tok, len ))
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return;
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memcpy( tok->last, start, sizeof(wchar_t)*len );
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tok->last[len] = L'\0';
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tok->last_type = TOK_STRING;
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}
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/**
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Read the next token as a comment.
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*/
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static void read_comment( tokenizer *tok )
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{
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const wchar_t *start;
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int len;
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start = tok->buff;
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while( *(tok->buff)!= L'\n' && *(tok->buff)!= L'\0' )
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tok->buff++;
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len = tok->buff - start;
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if( !check_size( tok, len ))
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return;
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memcpy( tok->last, start, sizeof(wchar_t)*len );
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tok->last[len] = L'\0';
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tok->last_type = TOK_COMMENT;
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}
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/**
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Read a FD redirection.
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*/
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static void read_redirect( tokenizer *tok, int fd )
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{
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int mode = -1;
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if( (*tok->buff == L'>') ||
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(*tok->buff == L'^') )
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{
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tok->buff++;
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if( *tok->buff == *(tok->buff-1) )
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{
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tok->buff++;
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mode = 1;
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}
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else
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{
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mode = 0;
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}
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if( *tok->buff == L'|' )
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{
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if( fd == 0 )
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{
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TOK_CALL_ERROR( tok, TOK_OTHER, PIPE_ERROR );
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return;
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}
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check_size( tok, FD_STR_MAX_LEN );
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tok->buff++;
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swprintf( tok->last, FD_STR_MAX_LEN, L"%d", fd );
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tok->last_type = TOK_PIPE;
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return;
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}
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}
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else if( *tok->buff == L'<' )
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{
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tok->buff++;
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mode = 2;
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}
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else
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{
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TOK_CALL_ERROR( tok, TOK_OTHER, REDIRECT_ERROR);
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}
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if( !check_size( tok, 2 ))
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{
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return;
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}
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swprintf( tok->last, tok->last_len, L"%d", fd );
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if( *tok->buff == L'&' )
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{
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tok->buff++;
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tok->last_type = TOK_REDIRECT_FD;
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}
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else if( *tok->buff == L'?' )
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{
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tok->buff++;
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tok->last_type = TOK_REDIRECT_NOCLOB;
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}
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else
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{
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tok->last_type = TOK_REDIRECT_OUT + mode;
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}
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}
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wchar_t tok_last_quote( tokenizer *tok )
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{
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CHECK( tok, 0 );
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return tok->last_quote;
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}
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/**
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Test if a character is whitespace. Differs from iswspace in that it
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does not consider a newline to be whitespace.
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*/
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static int my_iswspace( wchar_t c )
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{
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if( c == L'\n' )
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return 0;
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else
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return iswspace( c );
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}
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const wchar_t *tok_get_desc( int type )
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{
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if( type < 0 || (size_t)type >= sizeof( tok_desc ) )
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{
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return _(L"Invalid token type");
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}
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return _(tok_desc[type]);
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}
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void tok_next( tokenizer *tok )
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{
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CHECK( tok, );
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CHECK( tok->buff, );
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if( tok_last_type( tok ) == TOK_ERROR )
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{
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tok->has_next=0;
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return;
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}
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if( !tok->has_next )
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{
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/* wprintf( L"EOL\n" );*/
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tok->last_type = TOK_END;
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return;
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}
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while( 1 )
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{
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if( my_iswspace(*(tok->buff) ) )
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{
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tok->buff++;
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}
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else
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{
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if(( *(tok->buff) == L'\\') &&( *(tok->buff+1) == L'\n') )
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{
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tok->last_pos = tok->buff - tok->orig_buff;
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tok->buff+=2;
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tok->last_type = TOK_END;
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return;
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}
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break;
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}
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}
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if( *tok->buff == L'#')
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{
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if( tok->show_comments )
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{
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tok->last_pos = tok->buff - tok->orig_buff;
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read_comment( tok );
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return;
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}
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else
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{
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while( *(tok->buff)!= L'\n' && *(tok->buff)!= L'\0' )
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tok->buff++;
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}
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while( my_iswspace(*(tok->buff) ) )
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tok->buff++;
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}
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tok->last_pos = tok->buff - tok->orig_buff;
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switch( *tok->buff )
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{
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case L'\0':
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tok->last_type = TOK_END;
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/*fwprintf( stderr, L"End of string\n" );*/
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tok->has_next = 0;
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break;
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case 13:
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case L'\n':
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case L';':
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tok->last_type = TOK_END;
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tok->buff++;
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break;
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case L'&':
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tok->last_type = TOK_BACKGROUND;
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tok->buff++;
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break;
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case L'|':
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check_size( tok, 2 );
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tok->last[0]=L'1';
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tok->last[1]=L'\0';
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tok->last_type = TOK_PIPE;
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tok->buff++;
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break;
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case L'>':
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read_redirect( tok, 1 );
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return;
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case L'<':
|
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read_redirect( tok, 0 );
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return;
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case L'^':
|
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read_redirect( tok, 2 );
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return;
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|
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default:
|
|
{
|
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if( iswdigit( *tok->buff ) )
|
|
{
|
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const wchar_t *orig = tok->buff;
|
|
int fd = 0;
|
|
while( iswdigit( *tok->buff ) )
|
|
fd = (fd*10) + (*(tok->buff++) - L'0');
|
|
|
|
switch( *(tok->buff))
|
|
{
|
|
case L'^':
|
|
case L'>':
|
|
case L'<':
|
|
read_redirect( tok, fd );
|
|
return;
|
|
}
|
|
tok->buff = orig;
|
|
}
|
|
read_string( tok );
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
const wchar_t *tok_string( tokenizer *tok )
|
|
{
|
|
return tok?tok->orig_buff:0;
|
|
}
|
|
|
|
wchar_t *tok_first( const wchar_t *str )
|
|
{
|
|
tokenizer t;
|
|
wchar_t *res=0;
|
|
|
|
CHECK( str, 0 );
|
|
|
|
tok_init( &t, str, TOK_SQUASH_ERRORS);
|
|
|
|
switch( tok_last_type( &t ) )
|
|
{
|
|
case TOK_STRING:
|
|
// fwprintf( stderr, L"Got token %ls\n", tok_last( &t ));
|
|
res = wcsdup(tok_last( &t ));
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
tok_destroy( &t );
|
|
return res;
|
|
}
|
|
|
|
|
|
int tok_get_pos( tokenizer *tok )
|
|
{
|
|
CHECK( tok, 0 );
|
|
|
|
return tok->last_pos;
|
|
}
|
|
|
|
|
|
void tok_set_pos( tokenizer *tok, int pos )
|
|
{
|
|
CHECK( tok, );
|
|
|
|
tok->buff = tok->orig_buff + pos;
|
|
tok->has_next = 1;
|
|
tok_next( tok );
|
|
}
|
|
|
|
|
|
#ifdef TOKENIZER_TEST
|
|
|
|
/**
|
|
This main function is used for compiling the tokenizer_test command, used for testing the tokenizer.
|
|
*/
|
|
int main( int argc, char **argv )
|
|
{
|
|
tokenizer tok;
|
|
int i;
|
|
for ( i=1; i<argc; i++ )
|
|
{
|
|
wprintf( L"Tokenizing string %s\n", argv[i] );
|
|
for( tok_init( &tok, str2wcs(argv[i]), 0 ); tok_has_next( &tok ); tok_next( &tok ) )
|
|
{
|
|
switch( tok_last_type( &tok ) )
|
|
{
|
|
case TOK_INVALID:
|
|
wprintf( L"Type: INVALID\n" );
|
|
break;
|
|
case TOK_STRING:
|
|
wprintf( L"Type: STRING\t Value: %ls\n", tok_last( &tok ) );
|
|
break;
|
|
case TOK_PIPE:
|
|
wprintf( L"Type: PIPE\n" );
|
|
break;
|
|
case TOK_END:
|
|
wprintf( L"Type: END\n" );
|
|
break;
|
|
case TOK_ERROR:
|
|
wprintf( L"Type: ERROR\n" );
|
|
break;
|
|
default:
|
|
wprintf( L"Type: Unknown\n" );
|
|
break;
|
|
}
|
|
}
|
|
tok_destroy( &tok );
|
|
|
|
}
|
|
}
|
|
|
|
#endif
|