move more global parser and lexer variables to classes * pt-check.h, pt-check.cc (tree_checker::file_name): New data member. (tree_checker::gripe): Use it instead of curr_fcn_file_name. * input.h, input.cc, octave.cc (input_from_command_line_file): Delete global variable and all uses. * parse.h, oct-parse.in.yy (input_from_startup_file): Delete global variable and all uses. * input.h, input.cc, lex.h, lex.ll (curr_fcn_file_name, curr_fcn_file_full_name): Declare as members of lexical_feedback class. Rename to fcn_file_name and fcn_file_full_name. Change all uses. * oct-parse.in.yy (parse_fcn_file): New arg, file. Set curr_lexer->fcn_file_name and curr_lexer->fcn_file_full_name here. (load_fcn_from_file): Pass short file name to parse_fcn_file. * octave.cc (execute_command_line_file): Not here. * lex.h, lex.ll (lexical_feedback::force_script): New data member. * oct-parse.in.yy (parse_fcn_file): Set it here. * lex.h, lex.ll (lexical_feedback::input_from_terminal, lexical_feedback::input_from_file): New functions. * lex.ll (octave_lexer::handle_keyword): Set reading_fcn_file, reading_classdef_file, and reading_script_file. * lex.h, lex.ll (lexical_feedback::token_count): New variable. (COUNT_TOK_AND_RETURN): Increment it here. Don't count '\n' as a token. * lex.h, lex.ll (lexical_feedback::help_text): New variable. * parse.h, parse.in.yy (help_buf): Delete global variable and all uses. (octave_parser::frob_function, octave_parser::make_script): Use help_text. * lex.ll (octave_lexer::process_comment): Cache doc string directly in help_text variable. (looks_like_copyright): Move here from parse.in.yy. * lex.h, lex.ll (octave_lexer::prep_for_file): New function. (octave_lexer::prep_for_function_file, octave_lexer::prep_for_script_file): Delete. * parse.in.yy (INPUT_FILE_BEGIN): New start state. Delete SCRIPT_FILE_BEGIN and FCN_FILE_BEGIN. Tentatively set curr_lexer->reading_script_file to true. (parse_fcn_file): Call curr_lexer->prep_for_file. Don't call gobble_leading_whitespace. Don't attempt to determine function script, or classdef file status here. * parse.in.yy (INPUT_FILE): New token. (SCRIPT_FILE, FUNCTION_FILE): Delete. * lex.ll (octave_lexer::display_token): Update. * parse.in.yy (nl, opt_nl): New non-terminals. (function_file): Delete rule. (file): Rename from script_file. Allow opt_nl before opt_list. Don't make script if reading fcn file. * parse.in.yy (text_getc, class stdio_stream_reader, skip_white_space, looking_at_classdef_keyword, gobble_leading_white_space, looking_at_function_keyword): Delete. (get_help_from_file): Parse file to get help instead of calling gobble_leading_white_space