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Conf: Lexer parses quoted strings in a more descriptive way
This commit is contained in:
Maria Matejka
137
conf/cf-lex.l
137
conf/cf-lex.l
@@ -65,7 +65,7 @@ struct keyword {
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#endif
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static uint cf_hash(byte *c);
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static uint cf_hash(const byte *c);
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#define KW_KEY(n) n->name
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#define KW_NEXT(n) n->next
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@@ -96,6 +96,15 @@ int (*cf_read_hook)(byte *buf, unsigned int max, int fd);
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struct include_file_stack *ifs;
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static struct include_file_stack *ifs_head;
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#define QUOTED_BUFFER_SIZE 4096
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static BUFFER_(char) quoted_buffer;
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static char quoted_buffer_data[QUOTED_BUFFER_SIZE];
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static inline void quoted_buffer_init(void) {
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quoted_buffer.used = 0;
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quoted_buffer.size = QUOTED_BUFFER_SIZE;
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quoted_buffer.data = quoted_buffer_data;
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}
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#define MAX_INCLUDE_DEPTH 8
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#define YY_INPUT(buf,result,max) result = cf_read_hook(buf, max, ifs->fd);
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@@ -106,6 +115,8 @@ static struct include_file_stack *ifs_head;
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static void cf_include(char *arg, int alen);
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static int check_eof(void);
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static enum yytokentype cf_lex_symbol(const char *data);
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%}
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%option noyywrap
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@@ -113,24 +124,26 @@ static int check_eof(void);
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%option nounput
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%option noreject
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%x COMMENT CCOMM CLI
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%x COMMENT CCOMM CLI QUOTED APOSTROPHED INCLUDE
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ALPHA [a-zA-Z_]
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DIGIT [0-9]
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XIGIT [0-9a-fA-F]
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ALNUM [a-zA-Z_0-9]
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WHITE [ \t]
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include ^{WHITE}*include{WHITE}*\".*\"{WHITE}*;
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%%
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{include} {
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char *start, *end;
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^{WHITE}*include{WHITE}*\" {
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if (!ifs->depth)
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cf_error("Include not allowed in CLI");
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start = strchr(yytext, '"');
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start++;
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BEGIN(INCLUDE);
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}
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<INCLUDE>[^"\n]+["]{WHITE}*; {
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char *start, *end;
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start = yytext;
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end = strchr(start, '"');
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*end = 0;
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@@ -139,8 +152,16 @@ include ^{WHITE}*include{WHITE}*\".*\"{WHITE}*;
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cf_error("Include with empty argument");
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cf_include(start, end-start);
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BEGIN(INITIAL);
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}
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<INCLUDE>["] cf_error("Include with empty argument");
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<INCLUDE>. cf_error("Unterminated include");
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<INCLUDE>\n cf_error("Unterminated include");
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<INCLUDE><<EOF>> cf_error("Unterminated include");
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{DIGIT}+:{DIGIT}+ {
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uint len1 UNUSED, len2;
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u64 l;
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@@ -267,37 +288,23 @@ else: {
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return ELSECOL;
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}
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({ALPHA}{ALNUM}*|[']({ALNUM}|[-]|[\.]|[:])*[']) {
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if(*yytext == '\'') {
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yytext[yyleng-1] = 0;
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yytext++;
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}
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['] {
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BEGIN(APOSTROPHED);
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quoted_buffer_init();
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}
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struct keyword *k = HASH_FIND(kw_hash, KW, yytext);
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if (k)
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{
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if (k->value > 0)
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return k->value;
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else
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{
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cf_lval.i = -k->value;
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return ENUM;
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}
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}
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<APOSTROPHED>{ALNUM}|[-]|[.:] BUFFER_PUSH(quoted_buffer) = yytext[0];
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<APOSTROPHED>\n cf_error("Unterminated symbol");
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<APOSTROPHED><<EOF>> cf_error("Unterminated symbol");
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<APOSTROPHED>['] {
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BEGIN(INITIAL);
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BUFFER_PUSH(quoted_buffer) = 0;
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return cf_lex_symbol(quoted_buffer_data);
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}
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<APOSTROPHED>. cf_error("Invalid character in apostrophed symbol");
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cf_lval.s = cf_get_symbol(yytext);
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switch (cf_lval.s->class) {
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case SYM_VOID: return CF_SYM_VOID;
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case SYM_PROTO: return CF_SYM_PROTO;
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case SYM_TEMPLATE: return CF_SYM_TEMPLATE;
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case SYM_FUNCTION: return CF_SYM_FUNCTION;
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case SYM_FILTER: return CF_SYM_FILTER;
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case SYM_TABLE: return CF_SYM_TABLE;
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case SYM_ATTRIBUTE: return CF_SYM_ATTRIBUTE;
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case SYM_VARIABLE_RANGE: return CF_SYM_VARIABLE;
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case SYM_CONSTANT_RANGE: return CF_SYM_CONSTANT;
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default: bug("Unknown symbol class %d", cf_lval.s->class);
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}
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({ALPHA}{ALNUM}*) {
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return cf_lex_symbol(yytext);
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}
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<CLI>(.|\n) {
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@@ -313,14 +320,21 @@ else: {
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return yytext[0];
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}
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["][^"\n]*["] {
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yytext[yyleng-1] = 0;
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cf_lval.t = cfg_strdup(yytext+1);
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yytext[yyleng-1] = '"';
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["] {
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BEGIN(QUOTED);
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quoted_buffer_init();
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}
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<QUOTED>\n cf_error("Unterminated string");
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<QUOTED><<EOF>> cf_error("Unterminated string");
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<QUOTED>["] {
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BEGIN(INITIAL);
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BUFFER_PUSH(quoted_buffer) = 0;
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cf_lval.t = cfg_strdup(quoted_buffer_data);
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return TEXT;
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}
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["][^"\n]*\n cf_error("Unterminated string");
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<QUOTED>. BUFFER_PUSH(quoted_buffer) = yytext[0];
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<INITIAL,COMMENT><<EOF>> { if (check_eof()) return END; }
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@@ -361,7 +375,7 @@ else: {
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%%
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static uint
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cf_hash(byte *c)
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cf_hash(const byte *c)
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{
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uint h = 13 << 24;
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@@ -370,7 +384,6 @@ cf_hash(byte *c)
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return h;
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}
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/*
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* IFS stack - it contains structures needed for recursive processing
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* of include in config files. On the top of the stack is a structure
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@@ -531,7 +544,7 @@ check_eof(void)
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}
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static struct symbol *
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cf_new_symbol(byte *c)
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cf_new_symbol(const byte *c)
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{
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struct symbol *s;
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@@ -563,7 +576,7 @@ cf_new_symbol(byte *c)
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* signify no match.
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*/
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struct symbol *
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cf_find_symbol(struct config *cfg, byte *c)
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cf_find_symbol(struct config *cfg, const byte *c)
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{
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struct symbol *s;
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@@ -590,7 +603,7 @@ cf_find_symbol(struct config *cfg, byte *c)
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* existing symbol is found.
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*/
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struct symbol *
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cf_get_symbol(byte *c)
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cf_get_symbol(const byte *c)
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{
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return cf_find_symbol(new_config, c) ?: cf_new_symbol(c);
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}
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@@ -636,6 +649,36 @@ cf_default_name(char *template, int *counter)
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cf_error("Unable to generate default name");
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}
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static enum yytokentype
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cf_lex_symbol(const char *data)
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{
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struct keyword *k = HASH_FIND(kw_hash, KW, data);
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if (k)
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{
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if (k->value > 0)
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return k->value;
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else
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{
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cf_lval.i = -k->value;
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return ENUM;
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}
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}
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cf_lval.s = cf_get_symbol(data);
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switch (cf_lval.s->class) {
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case SYM_VOID: return CF_SYM_VOID;
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case SYM_PROTO: return CF_SYM_PROTO;
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case SYM_TEMPLATE: return CF_SYM_TEMPLATE;
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case SYM_FUNCTION: return CF_SYM_FUNCTION;
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case SYM_FILTER: return CF_SYM_FILTER;
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case SYM_TABLE: return CF_SYM_TABLE;
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case SYM_ATTRIBUTE: return CF_SYM_ATTRIBUTE;
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case SYM_VARIABLE_RANGE: return CF_SYM_VARIABLE;
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case SYM_CONSTANT_RANGE: return CF_SYM_CONSTANT;
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default: bug("Unknown symbol class %d", cf_lval.s->class);
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}
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}
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static void
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cf_lex_init_kh(void)
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{
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@@ -167,9 +167,9 @@ int cf_lex(void);
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void cf_lex_init(int is_cli, struct config *c);
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void cf_lex_unwind(void);
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struct symbol *cf_find_symbol(struct config *cfg, byte *c);
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struct symbol *cf_find_symbol(struct config *cfg, const byte *c);
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struct symbol *cf_get_symbol(byte *c);
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struct symbol *cf_get_symbol(const byte *c);
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struct symbol *cf_default_name(char *template, int *counter);
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struct symbol *cf_localize_symbol(struct symbol *sym);
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