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467 lines
9.0 KiB
467 lines
9.0 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* Copyright (C) 2002 Roman Zippel <[email protected]> |
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*/ |
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%option nostdinit noyywrap never-interactive full ecs |
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%option 8bit nodefault yylineno |
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%x ASSIGN_VAL HELP STRING |
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%{ |
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#include <assert.h> |
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#include <limits.h> |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include "lkc.h" |
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#include "parser.tab.h" |
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#define YY_DECL static int yylex1(void) |
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#define START_STRSIZE 16 |
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static struct { |
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struct file *file; |
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int lineno; |
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} current_pos; |
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static int prev_prev_token = T_EOL; |
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static int prev_token = T_EOL; |
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static char *text; |
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static int text_size, text_asize; |
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struct buffer { |
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struct buffer *parent; |
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YY_BUFFER_STATE state; |
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}; |
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static struct buffer *current_buf; |
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static int last_ts, first_ts; |
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static char *expand_token(const char *in, size_t n); |
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static void append_expanded_string(const char *in); |
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static void zconf_endhelp(void); |
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static void zconf_endfile(void); |
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static void new_string(void) |
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{ |
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text = xmalloc(START_STRSIZE); |
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text_asize = START_STRSIZE; |
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text_size = 0; |
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*text = 0; |
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} |
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static void append_string(const char *str, int size) |
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{ |
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int new_size = text_size + size + 1; |
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if (new_size > text_asize) { |
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new_size += START_STRSIZE - 1; |
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new_size &= -START_STRSIZE; |
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text = xrealloc(text, new_size); |
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text_asize = new_size; |
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} |
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memcpy(text + text_size, str, size); |
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text_size += size; |
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text[text_size] = 0; |
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} |
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static void alloc_string(const char *str, int size) |
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{ |
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text = xmalloc(size + 1); |
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memcpy(text, str, size); |
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text[size] = 0; |
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} |
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static void warn_ignored_character(char chr) |
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{ |
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fprintf(stderr, |
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"%s:%d:warning: ignoring unsupported character '%c'\n", |
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current_file->name, yylineno, chr); |
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} |
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%} |
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n [A-Za-z0-9_-] |
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%% |
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int str = 0; |
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int ts, i; |
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#.* /* ignore comment */ |
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[ \t]* /* whitespaces */ |
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\\\n /* escaped new line */ |
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\n return T_EOL; |
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"bool" return T_BOOL; |
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"choice" return T_CHOICE; |
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"comment" return T_COMMENT; |
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"config" return T_CONFIG; |
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"def_bool" return T_DEF_BOOL; |
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"def_tristate" return T_DEF_TRISTATE; |
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"default" return T_DEFAULT; |
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"depends" return T_DEPENDS; |
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"endchoice" return T_ENDCHOICE; |
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"endif" return T_ENDIF; |
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"endmenu" return T_ENDMENU; |
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"help" return T_HELP; |
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"hex" return T_HEX; |
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"if" return T_IF; |
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"imply" return T_IMPLY; |
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"int" return T_INT; |
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"mainmenu" return T_MAINMENU; |
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"menu" return T_MENU; |
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"menuconfig" return T_MENUCONFIG; |
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"modules" return T_MODULES; |
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"on" return T_ON; |
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"optional" return T_OPTIONAL; |
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"prompt" return T_PROMPT; |
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"range" return T_RANGE; |
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"select" return T_SELECT; |
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"source" return T_SOURCE; |
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"string" return T_STRING; |
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"tristate" return T_TRISTATE; |
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"visible" return T_VISIBLE; |
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"||" return T_OR; |
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"&&" return T_AND; |
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"=" return T_EQUAL; |
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"!=" return T_UNEQUAL; |
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"<" return T_LESS; |
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"<=" return T_LESS_EQUAL; |
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">" return T_GREATER; |
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">=" return T_GREATER_EQUAL; |
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"!" return T_NOT; |
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"(" return T_OPEN_PAREN; |
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")" return T_CLOSE_PAREN; |
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":=" return T_COLON_EQUAL; |
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"+=" return T_PLUS_EQUAL; |
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\"|\' { |
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str = yytext[0]; |
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new_string(); |
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BEGIN(STRING); |
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} |
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{n}+ { |
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alloc_string(yytext, yyleng); |
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yylval.string = text; |
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return T_WORD; |
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} |
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({n}|$)+ { |
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/* this token includes at least one '$' */ |
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yylval.string = expand_token(yytext, yyleng); |
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if (strlen(yylval.string)) |
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return T_WORD; |
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free(yylval.string); |
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} |
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. warn_ignored_character(*yytext); |
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<ASSIGN_VAL>{ |
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[^[:blank:]\n]+.* { |
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alloc_string(yytext, yyleng); |
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yylval.string = text; |
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return T_ASSIGN_VAL; |
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} |
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\n { BEGIN(INITIAL); return T_EOL; } |
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. |
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} |
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<STRING>{ |
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"$".* append_expanded_string(yytext); |
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[^$'"\\\n]+ { |
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append_string(yytext, yyleng); |
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} |
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\\.? { |
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append_string(yytext + 1, yyleng - 1); |
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} |
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\'|\" { |
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if (str == yytext[0]) { |
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BEGIN(INITIAL); |
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yylval.string = text; |
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return T_WORD_QUOTE; |
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} else |
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append_string(yytext, 1); |
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} |
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\n { |
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fprintf(stderr, |
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"%s:%d:warning: multi-line strings not supported\n", |
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zconf_curname(), zconf_lineno()); |
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unput('\n'); |
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BEGIN(INITIAL); |
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yylval.string = text; |
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return T_WORD_QUOTE; |
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} |
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<<EOF>> { |
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BEGIN(INITIAL); |
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yylval.string = text; |
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return T_WORD_QUOTE; |
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} |
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} |
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<HELP>{ |
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[ \t]+ { |
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ts = 0; |
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for (i = 0; i < yyleng; i++) { |
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if (yytext[i] == '\t') |
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ts = (ts & ~7) + 8; |
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else |
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ts++; |
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} |
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last_ts = ts; |
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if (first_ts) { |
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if (ts < first_ts) { |
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zconf_endhelp(); |
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return T_HELPTEXT; |
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} |
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ts -= first_ts; |
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while (ts > 8) { |
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append_string(" ", 8); |
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ts -= 8; |
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} |
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append_string(" ", ts); |
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} |
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} |
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[ \t]*\n/[^ \t\n] { |
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zconf_endhelp(); |
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return T_HELPTEXT; |
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} |
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[ \t]*\n { |
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append_string("\n", 1); |
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} |
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[^ \t\n].* { |
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while (yyleng) { |
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if ((yytext[yyleng-1] != ' ') && (yytext[yyleng-1] != '\t')) |
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break; |
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yyleng--; |
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} |
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append_string(yytext, yyleng); |
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if (!first_ts) |
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first_ts = last_ts; |
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} |
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<<EOF>> { |
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zconf_endhelp(); |
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return T_HELPTEXT; |
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} |
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} |
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<<EOF>> { |
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BEGIN(INITIAL); |
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if (prev_token != T_EOL && prev_token != T_HELPTEXT) |
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fprintf(stderr, "%s:%d:warning: no new line at end of file\n", |
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current_file->name, yylineno); |
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if (current_file) { |
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zconf_endfile(); |
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return T_EOL; |
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} |
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fclose(yyin); |
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yyterminate(); |
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} |
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%% |
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/* second stage lexer */ |
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int yylex(void) |
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{ |
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int token; |
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repeat: |
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token = yylex1(); |
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if (prev_token == T_EOL || prev_token == T_HELPTEXT) { |
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if (token == T_EOL) { |
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/* Do not pass unneeded T_EOL to the parser. */ |
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goto repeat; |
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} else { |
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/* |
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* For the parser, update file/lineno at the first token |
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* of each statement. Generally, \n is a statement |
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* terminator in Kconfig, but it is not always true |
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* because \n could be escaped by a backslash. |
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*/ |
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current_pos.file = current_file; |
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current_pos.lineno = yylineno; |
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} |
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} |
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if (prev_prev_token == T_EOL && prev_token == T_WORD && |
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(token == T_EQUAL || token == T_COLON_EQUAL || token == T_PLUS_EQUAL)) |
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BEGIN(ASSIGN_VAL); |
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prev_prev_token = prev_token; |
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prev_token = token; |
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return token; |
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} |
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static char *expand_token(const char *in, size_t n) |
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{ |
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char *out; |
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int c; |
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char c2; |
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const char *rest, *end; |
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new_string(); |
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append_string(in, n); |
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/* get the whole line because we do not know the end of token. */ |
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while ((c = input()) != EOF) { |
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if (c == '\n') { |
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unput(c); |
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break; |
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} |
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c2 = c; |
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append_string(&c2, 1); |
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} |
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rest = text; |
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out = expand_one_token(&rest); |
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/* push back unused characters to the input stream */ |
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end = rest + strlen(rest); |
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while (end > rest) |
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unput(*--end); |
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free(text); |
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return out; |
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} |
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static void append_expanded_string(const char *str) |
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{ |
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const char *end; |
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char *res; |
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str++; |
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res = expand_dollar(&str); |
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/* push back unused characters to the input stream */ |
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end = str + strlen(str); |
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while (end > str) |
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unput(*--end); |
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append_string(res, strlen(res)); |
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free(res); |
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} |
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void zconf_starthelp(void) |
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{ |
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new_string(); |
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last_ts = first_ts = 0; |
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BEGIN(HELP); |
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} |
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static void zconf_endhelp(void) |
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{ |
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yylval.string = text; |
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BEGIN(INITIAL); |
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} |
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/* |
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* Try to open specified file with following names: |
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* ./name |
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* $(srctree)/name |
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* The latter is used when srctree is separate from objtree |
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* when compiling the kernel. |
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* Return NULL if file is not found. |
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*/ |
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FILE *zconf_fopen(const char *name) |
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{ |
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char *env, fullname[PATH_MAX+1]; |
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FILE *f; |
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f = fopen(name, "r"); |
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if (!f && name != NULL && name[0] != '/') { |
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env = getenv(SRCTREE); |
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if (env) { |
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snprintf(fullname, sizeof(fullname), |
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"%s/%s", env, name); |
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f = fopen(fullname, "r"); |
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} |
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} |
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return f; |
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} |
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void zconf_initscan(const char *name) |
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{ |
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yyin = zconf_fopen(name); |
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if (!yyin) { |
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fprintf(stderr, "can't find file %s\n", name); |
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exit(1); |
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} |
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current_buf = xmalloc(sizeof(*current_buf)); |
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memset(current_buf, 0, sizeof(*current_buf)); |
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current_file = file_lookup(name); |
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yylineno = 1; |
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} |
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void zconf_nextfile(const char *name) |
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{ |
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struct file *iter; |
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struct file *file = file_lookup(name); |
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struct buffer *buf = xmalloc(sizeof(*buf)); |
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memset(buf, 0, sizeof(*buf)); |
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current_buf->state = YY_CURRENT_BUFFER; |
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yyin = zconf_fopen(file->name); |
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if (!yyin) { |
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fprintf(stderr, "%s:%d: can't open file \"%s\"\n", |
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zconf_curname(), zconf_lineno(), file->name); |
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exit(1); |
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} |
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yy_switch_to_buffer(yy_create_buffer(yyin, YY_BUF_SIZE)); |
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buf->parent = current_buf; |
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current_buf = buf; |
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current_file->lineno = yylineno; |
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file->parent = current_file; |
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for (iter = current_file; iter; iter = iter->parent) { |
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if (!strcmp(iter->name, file->name)) { |
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fprintf(stderr, |
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"Recursive inclusion detected.\n" |
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"Inclusion path:\n" |
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" current file : %s\n", file->name); |
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iter = file; |
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do { |
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iter = iter->parent; |
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fprintf(stderr, " included from: %s:%d\n", |
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iter->name, iter->lineno - 1); |
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} while (strcmp(iter->name, file->name)); |
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exit(1); |
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} |
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} |
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yylineno = 1; |
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current_file = file; |
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} |
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static void zconf_endfile(void) |
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{ |
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struct buffer *parent; |
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current_file = current_file->parent; |
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if (current_file) |
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yylineno = current_file->lineno; |
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parent = current_buf->parent; |
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if (parent) { |
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fclose(yyin); |
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yy_delete_buffer(YY_CURRENT_BUFFER); |
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yy_switch_to_buffer(parent->state); |
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} |
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free(current_buf); |
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current_buf = parent; |
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} |
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int zconf_lineno(void) |
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{ |
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return current_pos.lineno; |
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} |
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const char *zconf_curname(void) |
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{ |
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return current_pos.file ? current_pos.file->name : "<none>"; |
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}
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