NJU-ProjectN/nemu ics2023 initialized
NJU-ProjectN/nemu eb63cf3568dbf4e0c3c6ef462e6ec685550fabbc Merge pull request #76 from rijuyuezhu/master
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471
nemu/tools/kconfig/lexer.l
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471
nemu/tools/kconfig/lexer.l
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
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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 <unistd.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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"allnoconfig_y" return T_ALLNOCONFIG_Y;
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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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"defconfig_list" return T_DEFCONFIG_LIST;
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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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"option" return T_OPTION;
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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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