Exemplo n.º 1
0
/* As lexer_read_until, but elements of char_set preceded by \ are
   ignored as stops. */
int lexer_read_escaped_until(struct lexer_book *bk, char *char_set)
{
    char *char_set_slash = string_format("\\%s", char_set);

    int count = 0;

    do {
        count += lexer_read_until(bk, char_set_slash);

        if(!bk->eof && lexer_next_peek(bk) == '\\') {
            lexer_next_char(bk);	/* Jump the slash */
            char c = lexer_next_char(bk);
            count += 2;

            if(lexer_next_peek(bk) != CHAR_EOF)
                lexer_add_to_lexeme(bk, c);
        } else
            break;

    } while(!bk->eof);

    free(char_set_slash);

    if(bk->eof && !strchr(char_set, CHAR_EOF))
        lexer_report_error(bk, "Missing %s\n", char_set);

    return count;
}
Exemplo n.º 2
0
struct token *lexer_read_substitution(struct lexer *lx)
{
	char closer = 0;                  //closer is either 0 (no closer), ) or }.
	char c = lexer_next_peek(lx);

	if(c != '$')
		lexer_report_error(lx, "Expecting $ for variable substitution.");

	lexer_next_char(lx);	/* Jump $ */

	if(lexer_next_peek(lx) == '(') {
		lexer_next_char(lx);	/* Jump ( */
		closer = ')';
	} else if(lexer_next_peek(lx) == '{') {
		lexer_next_char(lx);	/* Jump { */
		closer = '}';
	}

	struct token *name = lexer_read_syntax_name(lx);
	name->type = TOKEN_SUBSTITUTION;

	if(closer) {
		if(lexer_next_peek(lx) == closer)
			lexer_next_char(lx);	/* Jump ) */
		else
			lexer_report_error(lx, "Expecting %c for closing variable substitution.", closer);
	}

	return name;
}
Exemplo n.º 3
0
accept_t lexer_read_variable(struct lexer_book * bk, struct token * name)
{
    lexer_discard_white_space(bk);

    if(lexer_next_peek(bk) == '=') {
        lexer_next_char(bk);
        lexer_add_to_lexeme(bk, '=');
    } else {
        int c = lexer_next_char(bk);
        if(lexer_next_peek(bk) != '=')
            return NO;
        lexer_add_to_lexeme(bk, c);
        lexer_next_char(bk);	/* Jump = */
    }

    lexer_push_token(bk, lexer_pack_token(bk, VARIABLE));
    lexer_push_token(bk, name);

    lexer_discard_white_space(bk);

    lexer_read_expandable(bk, '\n');
    lexer_roll_back(bk, 1);	//Recover '\n'

    lexer_discard_white_space(bk);

    if(lexer_next_char(bk) != '\n')
        return NO;

    return YES;
}
Exemplo n.º 4
0
struct token *lexer_read_substitution(struct lexer_book *bk)
{
    int parenthesis = 0;
    char c = lexer_next_peek(bk);

    if(c != '$')
        lexer_report_error(bk, "Expecting $ for variable substitution.");

    lexer_next_char(bk);	/* Jump $ */

    if(lexer_next_peek(bk) == '(') {
        lexer_next_char(bk);	/* Jump ( */
        parenthesis = 1;
    }

    struct token *name = lexer_read_syntax_name(bk);
    name->type = SUBSTITUTION;

    if(parenthesis) {
        if(lexer_next_peek(bk) == ')')
            lexer_next_char(bk);	/* Jump ) */
        else
            lexer_report_error(bk, "Expecting ) for closing variable substitution.");
    }

    return name;
}
Exemplo n.º 5
0
int lexer_read_variable(struct lexer *lx, struct token *name)
{
	lexer_discard_white_space(lx);

	if(lexer_next_peek(lx) == '=') {
		lexer_next_char(lx);
		lexer_add_to_lexeme(lx, '=');
	} else {
		int c = lexer_next_char(lx);
		if(lexer_next_peek(lx) != '=')
			lexer_report_error(lx, "Missing = in variable definition.");
		lexer_add_to_lexeme(lx, c);
		lexer_next_char(lx);	/* Jump = */
	}

	lexer_push_token(lx, lexer_pack_token(lx, TOKEN_VARIABLE));
	lexer_push_token(lx, name);

	lexer_discard_white_space(lx);

	//Read variable value
	lexer_push_token(lx, lexer_read_expandable(lx, '\n'));
	lexer_roll_back(lx, 1);	//Recover '\n'

	lexer_discard_white_space(lx);

	if(lexer_next_char(lx) != '\n')
		lexer_report_error(lx, "Missing newline at end of variable definition.");

	return 1;
}
Exemplo n.º 6
0
int lexer_peek_remote_rename_syntax(struct lexer_book *bk)
{
    if(lexer_next_peek(bk) != '-')
        return 0;

    lexer_next_char(bk);

    int is_gt = (lexer_next_peek(bk) == '>');
    lexer_roll_back(bk, 1);

    return is_gt;
}
Exemplo n.º 7
0
int lexer_peek_remote_rename_syntax(struct lexer *lx)
{
	if(lexer_next_peek(lx) != '-')
		return 0;

	lexer_next_char(lx);

	int is_gt = (lexer_next_peek(lx) == '>');
	lexer_roll_back(lx, 1);

	return is_gt;
}
Exemplo n.º 8
0
struct token *lexer_read_literal_in_expandable_until(struct lexer_book *bk, char end_marker)
{
    char end_markers[7] = { end_marker, '$', '\\', '"', '\'', '#', CHAR_EOF };

    int count = 0;
    do {
        count += lexer_read_until(bk, end_markers);

        if(bk->eof)
            break;

        char c = lexer_next_peek(bk);
        if(c == '\\') {
            lexer_next_char(bk);	/* Jump the slash */
            char n = lexer_next_char(bk);
            count += 2;

            if(lexer_special_escape(n))
                lexer_add_to_lexeme(bk, lexer_special_to_code(n));
            else
                lexer_add_to_lexeme(bk, n);
        } else if(c == '#') {
            if(end_marker == '\n') {
                lexer_discard_comments(bk);
                break;
            }
        } else
            break;
    } while(!bk->eof);

    if(bk->eof && strchr(")\"'", end_marker))
        lexer_report_error(bk, "Missing closing %c.\n", end_marker);

    return lexer_pack_token(bk, LITERAL);
}
Exemplo n.º 9
0
int lexer_read_expandable_recursive(struct lexer_book *bk, char end_marker)
{
    int count = 0;
    lexer_discard_white_space(bk);

    while(!bk->eof) {
        int c = lexer_next_peek(bk);

        if(c == '$') {
            count++;
            lexer_push_token(bk, lexer_read_substitution(bk));
        }
        if(c == '\'') {
            lexer_read_literal(bk);
            lexer_push_token(bk, lexer_pack_token(bk, LITERAL));
        } else if(c == end_marker) {
            lexer_next_char(bk);	/* Jump end_marker */
            return count;
        } else if(c == '"')
            count += lexer_read_expandable_recursive(bk, '"');
        else if(c == '#' && end_marker != '"') {
            lexer_discard_comments(bk);
            return count;
        } else {
            count++;
            lexer_push_token(bk, lexer_read_literal_in_expandable_until(bk, end_marker));
        }
    }
    /* Found eof before end_marker */
    abort();
}
Exemplo n.º 10
0
accept_t lexer_read_command(struct lexer_book *bk)
{
    if(lexer_next_peek(bk) != '\t')
        return NO;

    int count = 0;

    lexer_discard_white_space(bk);

    struct token *t;
    do {
        t = lexer_read_command_argument(bk);
        if(!t)
            break;
        if(t->type == NEWLINE && count == 0) {
            lexer_report_error(bk, "Missing command line.\n");
        } else if(t->type != NEWLINE && count == 0) {
            /* Add command start marker */
            lexer_push_token(bk, lexer_pack_token(bk, COMMAND));
        }
        lexer_push_token(bk, t);
        count++;
    } while(t->type != NEWLINE);

    if(count > 1)
        return YES;
    else {
        return NO;
    }
}
Exemplo n.º 11
0
/* Returns the count of characters that we would have to roll-back to
   undo the read. */
int lexer_read_until(struct lexer_book *bk, char *char_set)
{
	int count = 0;
	char c;

	do	
	{
		c = lexer_next_peek(bk);
		if( strchr(char_set, c) )
		{
			return count;
		}

		if( c != CHAR_EOF )
			lexer_add_to_lexeme(bk, c);

		lexer_next_char(bk);
		count++;

	} while( c != CHAR_EOF );

	bk->eof = 1;

	return count;
}
Exemplo n.º 12
0
accept_t lexer_read_line(struct lexer_book * bk)
{
    char c = lexer_next_peek(bk);

    int colon, equal;

    bk->substitution_mode = ROOT;

    switch (c) {
    case CHAR_EOF:
        /* Found end of file */
        lexer_next_char(bk);
        return YES;
        break;
    case '#':
        lexer_discard_comments(bk);
        return YES;
        break;
    case '\t':
        bk->substitution_mode = COMMAND;
        return lexer_read_command(bk);
        break;
    case ' ':
        /* Eat whitespace and try again */
        lexer_discard_white_space(bk);
        return lexer_read_line(bk);
        break;
    case '\n':
        /* Ignore empty lines and try again */
        lexer_next_char(bk);
        return lexer_read_line(bk);
        break;
    case '@':
        /* Jump @ */
        bk->substitution_mode = SYNTAX;
        lexer_next_char(bk);
        return lexer_read_syntax(bk);
        break;
    default:
        /* Either makeflow keyword (e.g. export), a file list, or variable assignment */
        lexer_discard_white_space(bk);

        colon = lexer_unquoted_look_ahead_count(bk, ":");
        equal = lexer_unquoted_look_ahead_count(bk, "=");

        fprintf(stderr, "%d %d %c\n", colon, equal, c);


        if((colon != -1) && (equal == -1 || colon < equal)) {
            bk->substitution_mode = FILES;
            return lexer_read_file_list(bk);
        } else {
            bk->substitution_mode = SYNTAX;
            return lexer_read_syntax(bk);
        }
        break;
    }

}
Exemplo n.º 13
0
accept_t lexer_read_literal(struct lexer_book * bk)
{
    int c = lexer_next_peek(bk);

    if(c == '\'')
        return lexer_read_literal_quoted(bk);
    else
        return lexer_read_literal_unquoted(bk);
}
Exemplo n.º 14
0
int lexer_read_literal(struct lexer * lx)
{
	int c = lexer_next_peek(lx);

	if(c == '\'')
		return lexer_read_literal_quoted(lx);
	else
		return lexer_read_literal_unquoted(lx);
}
Exemplo n.º 15
0
/* A comment starts with # and ends with a newline, or end-of-file */
void lexer_discard_comments(struct lexer_book *bk)
{
    if(lexer_next_peek(bk) != '#')
        lexer_report_error(bk, "Expecting a comment.");

    char c;
    do {
        c = lexer_next_char(bk);
    } while(c != '\n' && c != CHAR_EOF);
}
Exemplo n.º 16
0
int lexer_discard_white_space(struct lexer *lx)
{
	int count = 0;
	while(strchr(WHITE_SPACE, lexer_next_peek(lx))) {
		lexer_next_char(lx);
		count++;
	}

	return count;
}
Exemplo n.º 17
0
struct token *lexer_read_command_argument(struct lexer_book *bk)
{
	int c = lexer_next_peek(bk);

	switch(c)
	{
	case CHAR_EOF:
		/* Found end of file while completing command */
		bk->lexeme_end++;
		bk->eof = 1;

		if( bk->stream )
			return lexer_pack_token(bk, NEWLINE);
		else
			return NULL;
		break;
	case '\n' :
		lexer_next_char(bk);           /* Jump \n */
		lexer_add_to_lexeme(bk, c);
		return lexer_pack_token(bk, NEWLINE);
		break;
	case '#' :
		lexer_discard_comments(bk);
		lexer_add_to_lexeme(bk, '\n');
		return lexer_pack_token(bk, NEWLINE);
	case ' ' :
	case '\t':
		return lexer_read_white_space(bk);
		break;
	case '$'  :
		return lexer_read_substitution(bk);
		break;
	case '"' :
		return lexer_read_expandable(bk, '"');
		break;
	case '<' :
	case '>' :
		lexer_next_char(bk);           /* Jump <, > */
		lexer_add_to_lexeme(bk, c);
		return lexer_pack_token(bk, IO_REDIRECT);
		break;
	case '\'':
		lexer_add_to_lexeme(bk, '\'');
		lexer_read_literal(bk);
		lexer_add_to_lexeme(bk, '\'');
		return lexer_pack_token(bk, LITERAL);
		break;
	default:
		lexer_read_literal(bk);
		return lexer_pack_token(bk, LITERAL);
		break;
	}
}
Exemplo n.º 18
0
struct token *lexer_read_file(struct lexer *lx)
{
	int c = lexer_next_peek(lx);

	switch (c) {
	case CHAR_EOF:
		lx->lexeme_end++;
		lx->eof = 1;
		if(lx->depth == 0)
			lexer_report_error(lx, "Found end of file while completing file list.\n");
		return NULL;
		break;
	case '\n':
		lexer_next_char(lx);	/* Jump \n */
		lexer_add_to_lexeme(lx, c);
		return lexer_pack_token(lx, TOKEN_NEWLINE);
		break;
	case '#':
		lexer_discard_comments(lx);
		lexer_add_to_lexeme(lx, '\n');
		return lexer_pack_token(lx, TOKEN_NEWLINE);
	case ':':
		lexer_next_char(lx);	/* Jump : */
		return lexer_pack_token(lx, TOKEN_COLON);
		break;
	case ' ':
	case '\t':
		/* Discard white-space and add space token. */
		lexer_discard_white_space(lx);
		return lexer_pack_token(lx, TOKEN_SPACE);
		break;
	case '$':
		return lexer_read_substitution(lx);
		break;
	case '\'':
		lexer_add_to_lexeme(lx, '\'');
		lexer_read_literal_quoted(lx);
		lexer_add_to_lexeme(lx, '\'');
		return lexer_pack_token(lx, TOKEN_LITERAL);
		break;
	case '-':
		if(lexer_peek_remote_rename_syntax(lx)) {
			lexer_next_char(lx);	/* Jump -> */
			lexer_next_char(lx);
			return lexer_pack_token(lx, TOKEN_REMOTE_RENAME);
		}
		/* Else fall through */
	default:
		return lexer_read_filename(lx);
		break;
	}
}
Exemplo n.º 19
0
int lexer_read_line(struct lexer * lx)
{
	char c = lexer_next_peek(lx);

	int colon, equal;

	switch (c) {
	case CHAR_EOF:
		/* Found end of file */
		return lexer_next_char(lx);
		break;
	case '#':
		lexer_discard_comments(lx);
		return 1;
		break;
	case '\t':
		return lexer_read_command(lx);
		break;
	case '\n':
		/* Ignore empty lines and try again */
		lexer_next_char(lx);
		return lexer_read_line(lx);
		break;
	case '@':
		/* Jump @ */
		lexer_next_char(lx);
		return lexer_read_syntax_or_variable(lx);
		break;
	default:
		/* Either makeflow keyword (e.g. export), a file list, or variable assignment */
		lexer_discard_white_space(lx);

		colon = lexer_unquoted_look_ahead_count(lx, ":");
		equal = lexer_unquoted_look_ahead_count(lx, "=");

		/* If there is a colon and it appears before any existing
		 * equal sign read the line as a file list. */
		if((colon != -1) && (equal == -1 || colon < equal)) {
			lexer_read_file_list(lx);
		}
		else if(c == ' ' && equal == -1) {
			/* A command starting with a space.. for backwards compatibility. */
			return lexer_read_command(lx);
		}
		else {
			lexer_read_syntax_or_variable(lx);
		}

		return 1;
		break;
	}
}
Exemplo n.º 20
0
struct token *lexer_read_file(struct lexer_book *bk)
{
	int c = lexer_next_peek(bk);

	switch(c)
	{
	case CHAR_EOF:
		lexer_report_error(bk, "Found end of file while completing file list.\n");
		return NULL;
		break;
	case '\n' :
		lexer_next_char(bk);           /* Jump \n */
		lexer_add_to_lexeme(bk, c);
		return lexer_pack_token(bk, NEWLINE);
		break;
	case '#' :
		lexer_discard_comments(bk);
		lexer_add_to_lexeme(bk, '\n');
		return lexer_pack_token(bk, NEWLINE);
	case ':' :
		lexer_next_char(bk);           /* Jump : */
		return lexer_pack_token(bk, COLON);
		break;
	case ' ' :
	case '\t':
		/* Discard white-space and try again */
		lexer_discard_white_space(bk);
		return lexer_read_file(bk);
		break;
	case '$'  :
		return lexer_read_substitution(bk);
		break;
	case '\'':
		lexer_add_to_lexeme(bk, '\'');
		lexer_read_literal_quoted(bk);
		lexer_add_to_lexeme(bk, '\'');
		return lexer_pack_token(bk, LITERAL);
		break;
	case '-' :
		if( lexer_peek_remote_rename_syntax(bk) )
		{
			lexer_next_char(bk);           /* Jump -> */
			lexer_next_char(bk);           
			return lexer_pack_token(bk, REMOTE_RENAME);
		}
		/* Else fall through */
	default:
		return lexer_read_filename(bk);
		break;
	}
}
Exemplo n.º 21
0
struct token *lexer_read_command_argument(struct lexer *lx)
{
	int c = lexer_next_peek(lx);

	switch (c) {
	case CHAR_EOF:
		/* Found end of file while completing command */
		lx->lexeme_end++;
		lx->eof = 1;

		if(lx->depth == 0)
			lexer_report_error(lx, "Found end of file while completing command.\n");
		return NULL;
		break;
	case '\n':
		lexer_next_char(lx);	/* Jump \n */
		lexer_add_to_lexeme(lx, c);
		return lexer_pack_token(lx, TOKEN_NEWLINE);
		break;
	case '#':
		lexer_discard_comments(lx);
		lexer_add_to_lexeme(lx, '\n');
		return lexer_pack_token(lx, TOKEN_NEWLINE);
	case ' ':
	case '\t':
		return lexer_read_white_space(lx);
		break;
	case '$':
		return lexer_read_substitution(lx);
		break;
	case '"':
		return lexer_read_expandable(lx, '"');
		break;
	case '<':
	case '>':
		lexer_next_char(lx);	/* Jump <, > */
		lexer_add_to_lexeme(lx, c);
		return lexer_pack_token(lx, TOKEN_IO_REDIRECT);
		break;
	case '\'':
		lexer_add_to_lexeme(lx, '\'');
		lexer_read_literal(lx);
		lexer_add_to_lexeme(lx, '\'');
		return lexer_pack_token(lx, TOKEN_LITERAL);
		break;
	default:
		lexer_read_literal(lx);
		return lexer_pack_token(lx, TOKEN_LITERAL);
		break;
	}
}
Exemplo n.º 22
0
/* Read everything between single quotes */
int lexer_read_literal_quoted(struct lexer * lx)
{
	int c = lexer_next_peek(lx);

	if(c != '\'')
		lexer_report_error(lx, "Missing opening quote.\n");

	lexer_add_to_lexeme(lx, lexer_next_char(lx));	/* Add first ' */

	int count = lexer_read_escaped_until(lx, "'");

	lexer_add_to_lexeme(lx, lexer_next_char(lx));	/* Add second ' */

	return count;
}
Exemplo n.º 23
0
/* Read a filename, adding '-' to names when - is not followed by
   >. The 'recursive' comes because the function calls itself when
   completing a name when it added a -. */
int lexer_read_filename_recursive(struct lexer_book *bk)
{
    int count = lexer_read_escaped_until(bk, FILENAME_LIMITS);

    if(count < 1)
        return count;

    if(lexer_next_peek(bk) == '-' && !lexer_peek_remote_rename_syntax(bk)) {
        lexer_add_to_lexeme(bk, '-');
        count++;
        count += lexer_read_filename_recursive(bk);
    }

    return count;
}
Exemplo n.º 24
0
/* Read a filename, adding '-' to names when - is not followed by
   >. The 'recursive' comes because the function calls itself when
   completing a name when it added a -. */
int lexer_read_filename_recursive(struct lexer *lx)
{
	int count = lexer_read_escaped_until(lx, FILENAME_LIMITS);

	if(count < 1)
		return count;

	if(lexer_next_peek(lx) == '-' && !lexer_peek_remote_rename_syntax(lx)) {
		lexer_add_to_lexeme(lx, '-');
		lexer_next_char(lx);
		count++;
		count += lexer_read_filename_recursive(lx);
	}

	return count;
}
Exemplo n.º 25
0
/* Read everything between single quotes */
accept_t lexer_read_literal_quoted(struct lexer_book * bk)
{
    int c = lexer_next_peek(bk);

    if(c != '\'')
        return NO;

    lexer_next_char(bk);	/* Jump first ' */

    int count = lexer_read_escaped_until(bk, "'");
    if(count >= 0) {
        lexer_next_char(bk);	/* Jump second ' */
        return YES;
    } else
        return NO;
}
Exemplo n.º 26
0
/* Consolidates a sequence of white space into a single SPACE token */
struct token *lexer_read_white_space(struct lexer_book *bk)
{
    int count = 0;

    while(strchr(WHITE_SPACE, lexer_next_peek(bk))) {
        count++;
        lexer_next_char(bk);
    }

    if(count > 0) {
        lexer_add_to_lexeme(bk, ' ');
        return lexer_pack_token(bk, SPACE);
    } else
        lexer_report_error(bk, "Expecting white space.");

    return NULL;
}
Exemplo n.º 27
0
/* Consolidates a sequence of white space into a single SPACE token */
struct token *lexer_read_white_space(struct lexer *lx)
{
	int count = lexer_discard_white_space(lx);

	while(strchr(WHITE_SPACE, lexer_next_peek(lx))) {
		count++;
		lexer_next_char(lx);
	}

	if(count > 0) {
		lexer_add_to_lexeme(lx, ' ');
		return lexer_pack_token(lx, TOKEN_SPACE);
	} else
		lexer_report_error(lx, "Expecting white space.");

	return NULL;
}
Exemplo n.º 28
0
void lexer_append_all_tokens(struct lexer_book *bk, struct lexer_book *bk_s)
{
	struct token *head_s;
	
	bk_s->substitution_mode = bk->substitution_mode;
	while( !bk_s->eof )
	{
		if(lexer_next_peek(bk_s) == CHAR_EOF)
		{
			/* Found end of string while completing command */
			bk_s->lexeme_end++;
			bk_s->eof = 1;
		}
		else
		{
			switch(bk_s->substitution_mode)
			{
			case CHAR_EOF:
			case COMMAND:
				head_s = lexer_read_command_argument(bk_s);
				break;
			case FILES:
				head_s = lexer_read_file(bk_s);
				break;
			case SYNTAX:
				lexer_read_expandable(bk_s, CHAR_EOF);
				head_s = lexer_pack_token(bk_s, LITERAL);
				break;
			default:
				lexer_read_line(bk_s);
				continue;
				break;
			}

			if(head_s)
				lexer_push_token(bk_s, head_s);
		}
	}

	while( (head_s = list_pop_tail(bk_s->token_queue)) != NULL )
		list_push_head(bk->token_queue, head_s);
}
Exemplo n.º 29
0
int lexer_read_variable_list(struct lexer * lx)
{
	int c;

	while((c = lexer_next_peek(lx)) != '\n') {
		lexer_discard_white_space(lx);
		if(c == '#') {
			lexer_discard_comments(lx);
			lexer_roll_back(lx, 1);	//Recover the newline
			break;
		}

		lexer_push_token(lx, lexer_read_syntax_name(lx));
	}

	lexer_add_to_lexeme(lx, lexer_next_char(lx));	//Drop the newline
	lexer_push_token(lx, lexer_pack_token(lx, TOKEN_NEWLINE));

	return 1;
}
Exemplo n.º 30
0
accept_t lexer_read_variable_list(struct lexer_book * bk)
{
    int c;

    while((c = lexer_next_peek(bk)) != '\n') {
        lexer_discard_white_space(bk);
        if(c == '#') {
            lexer_discard_comments(bk);
            lexer_roll_back(bk, 1);	//Recover the newline
            break;
        }

        lexer_push_token(bk, lexer_read_syntax_name(bk));

    }

    lexer_add_to_lexeme(bk, lexer_next_char(bk));	//Drop the newline
    lexer_push_token(bk, lexer_pack_token(bk, NEWLINE));

    return YES;
}