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| version 1.56, 2001/03/06 15:30:49 | version 1.70, 2001/03/08 09:31:47 |
|---|---|
| Line 42 int yylex(YYSTYPE *lvalp, void *pc); | Line 42 int yylex(YYSTYPE *lvalp, void *pc); |
| %token STRING | %token STRING |
| %token BOGUS | %token BOGUS |
| %token BAD_STRING_COMPARISON_OPERATOR | |
| %token LAND "&&" | |
| %token LOR "||" | |
| %token LXOR "##" | |
| %token NLE "<=" | |
| %token NGE ">=" | |
| %token NEQ "==" | |
| %token NNE "!=" | |
| %token SLT "lt" | |
| %token SGT "gt" | |
| %token SLE "le" | |
| %token SGE "ge" | |
| %token SEQ "eq" | |
| %token SNE "ne" | |
| %token DEF "def" | |
| %token IN "in" | |
| %token FEXISTS "-f" | |
| /* logical */ | |
| %left "lt" "gt" "le" "ge" | |
| %left "eq" "ne" | |
| %left '<' '>' "<=" ">=" "##" | |
| %left "==" "!=" | |
| %left "||" | |
| %left "&&" | |
| %left "def" "in" "-f" | |
| %left '!' | |
| /* bitwise */ | |
| %left '#' | |
| %left '&' '|' | |
| %left '~' | |
| /* numerical */ | /* numerical */ |
| %left '-' '+' | %left '-' '+' |
| %left '*' '/' | %left '*' '/' '%' |
| %left NEG /* negation: unary - */ | %left NEG /* negation: unary - */ |
| /* bitwise */ | |
| %left INV /* invertion: unary ~ */ | |
| /* logical */ | |
| %left NOT /* not: unary ! */ | |
| %% | %% |
| Line 159 action: get | put | with | call; | Line 191 action: get | put | with | call; |
| /* get */ | /* get */ |
| get: '$' get_name { | get: get_value { |
| $$=$2; /* stack: resulting value */ | $$=$1; /* stack: resulting value */ |
| O($$, OP_WRITE); /* value=pop; write(value) */ | O($$, OP_WRITE); /* value=pop; wcontext.write(value) */ |
| }; | }; |
| get_name: name_without_curly_rdive EON | name_in_curly_rdive; | get_value: '$' get_name_value { $$=$2 } |
| get_name_value: name_without_curly_rdive EON | name_in_curly_rdive; | |
| name_in_curly_rdive: '{' name_without_curly_rdive '}' { $$=$2 }; | name_in_curly_rdive: '{' name_without_curly_rdive '}' { $$=$2 }; |
| name_without_curly_rdive: | name_without_curly_rdive: |
| name_without_curly_rdive_read | name_without_curly_rdive_read |
| Line 237 any_constructor_code_value: | Line 270 any_constructor_code_value: |
| constructor_code_value: constructor_code { | constructor_code_value: constructor_code { |
| $$=N(POOL); | $$=N(POOL); |
| O($$, OP_CREATE_EWPOOL); /* stack: empty write context */ | O($$, OP_CREATE_EWPOOL); /* stack: empty write context */ |
| P($$, $1); /* some codes to that context */ | P($$, $1); /* some code that writes to that context */ |
| O($$, OP_REDUCE_EWPOOL); /* context=pop; stack: context.value() */ | O($$, OP_REDUCE_EWPOOL); /* context=pop; stack: context.value() */ |
| }; | }; |
| constructor_code: codes__excluding_sole_str_literal; | constructor_code: codes__excluding_sole_str_literal; |
| Line 245 codes__excluding_sole_str_literal: actio | Line 278 codes__excluding_sole_str_literal: actio |
| /* call */ | /* call */ |
| call: '^' call_name store_params EON { /* ^field.$method{vasya} */ | call: call_value { |
| $$=$1; /* stack: value */ | |
| O($$, OP_WRITE); /* value=pop; wcontext.write(value) */ | |
| }; | |
| call_value: '^' call_name store_params EON { /* ^field.$method{vasya} */ | |
| $$=$2; /* with_xxx,diving code; stack: context,method_junction */ | $$=$2; /* with_xxx,diving code; stack: context,method_junction */ |
| O($$, OP_GET_METHOD_FRAME); /* stack: context,method_frame */ | O($$, OP_GET_METHOD_FRAME); /* stack: context,method_frame */ |
| P($$, $3); /* filling method_frame.store_params */ | P($$, $3); /* filling method_frame.store_params */ |
| O($$, OP_CALL); /* method_frame=pop; ncontext=pop; call(ncontext,method_frame) */ | O($$, OP_CALL); /* method_frame=pop; ncontext=pop; call(ncontext,method_frame) stack: value */ |
| }; | }; |
| call_name: name_without_curly_rdive; | call_name: name_without_curly_rdive; |
| store_params: store_param | store_params store_param { $$=$1; P($$, $2) }; | store_params: store_param | store_params store_param { $$=$1; P($$, $2) }; |
| store_param: store_round_param | store_curly_param; | store_param: |
| store_round_param: '[' store_param_parts ']' {$$=$2}; | store_square_param |
| store_param_parts: | | store_round_param |
| store_param_part | | store_curly_param |
| | store_param_parts ';' store_param_part { $$=$1; P($$, $3) } | |
| ; | ; |
| store_square_param: '[' store_code_param_parts ']' {$$=$2}; | |
| store_round_param: '(' store_expr_param_parts ')' {$$=$2}; | |
| store_curly_param: '{' maybe_codes '}' { | store_curly_param: '{' maybe_codes '}' { |
| $$=N(POOL); | $$=N(POOL); |
| PCA($$, $2); | PCA($$, $2); |
| O($$, OP_STORE_PARAM); | |
| }; | }; |
| store_param_part: | store_code_param_parts: |
| store_code_param_part | |
| | store_code_param_parts ';' store_code_param_part { $$=$1; P($$, $3) } | |
| ; | |
| store_expr_param_parts: | |
| store_expr_param_part | |
| | store_expr_param_parts ';' store_expr_param_part { $$=$1; P($$, $3) } | |
| ; | |
| store_code_param_part: | |
| empty /* optimized () case */ | empty /* optimized () case */ |
| | STRING { /* optimized (STRING) case */ | | STRING { /* optimized (STRING) case */ |
| $$=$1; | $$=$1; |
| Line 274 store_param_part: | Line 319 store_param_part: |
| } | } |
| | constructor_code_value { /* (something complex) */ | | constructor_code_value { /* (something complex) */ |
| $$=$1; | $$=$1; |
| O($$, OP_STORE_PARAM); | |
| } | } |
| ; | ; |
| store_expr_param_part: write_expr_value { | |
| $$=N(POOL); | |
| PCA($$, $1); | |
| O($$, OP_STORE_PARAM); | |
| }; | |
| write_expr_value: any_expr { | |
| $$=$1; | |
| O($$, OP_WRITE); | |
| }; | |
| /* name */ | /* name */ |
| Line 358 with: '$' name_without_curly_rdive '{' c | Line 411 with: '$' name_without_curly_rdive '{' c |
| any_expr: | any_expr: |
| empty_double_value /* optimized $var() case */ | empty_double_value /* optimized $var() case */ |
| | expr /* $var(something) */ | | optimized_expr /* $var(something) */ |
| ; | ; |
| optimized_expr: expr { | |
| if(($$=$1)->size()==2) { // only one string literal in there? | |
| change_string_literal_to_double_literal($$); // make that string literal Double | |
| } | |
| }; | |
| expr: | expr: |
| number | STRING |
| | expr '+' expr { | | get_value |
| $$=$1; // stack: first operand | | call_value |
| P($$, $3); // stack: first,second operands | | '"' string_inside_quotes_value '"' { $$ = $2; } |
| O($$, OP_ADD); // value=first+second; stack: value | |
| } | |
| | expr '-' expr { | |
| $$=$1; // stack: first operand | |
| P($$, $3); // stack: first,second operands | |
| O($$, OP_SUB); // value=first-second; stack: value | |
| } | |
| | expr '*' expr { | |
| $$=$1; // stack: first operand | |
| P($$, $3); // stack: first,second operands | |
| O($$, OP_MUL); // value=first*second; stack: value | |
| } | |
| | expr '/' expr { | |
| $$=$1; // stack: first operand | |
| P($$, $3); // stack: first,second operands | |
| O($$, OP_DIV); // value=first/second; stack: value | |
| } | |
| | '-' expr %prec NEG { | |
| $$=$2; // stack: operand | |
| O($$, OP_NEG); // value=-operand; stack: value | |
| } | |
| | '~' expr %prec INV { | |
| $$=$2; // stack: operand | |
| O($$, OP_INV); // value=~operand; stack: value | |
| } | |
| | '!' expr %prec NOT { | |
| $$=$2; // stack: operand | |
| O($$, OP_NOT); // value=!operand; stack: value | |
| } | |
| | '(' expr ')' { $$ = $2; } | | '(' expr ')' { $$ = $2; } |
| /* stack: operand // stack: @operand */ | |
| | '-' expr %prec NEG { $$=$2; O($$, OP_NEG) } | |
| | '~' expr { $$=$2; O($$, OP_INV) } | |
| | '!' expr { $$=$2; O($$, OP_NOT) } | |
| | "def" expr { $$=$2; O($$, OP_DEF) } | |
| | "in" expr { $$=$2; O($$, OP_IN) } | |
| | "-f" expr { $$=$2; O($$, OP_FEXISTS) } | |
| /* stack: a,b // stack: a@b */ | |
| | expr '-' expr { $$=$1; P($$, $3); O($$, OP_SUB) } | |
| | expr '+' expr { $$=$1; P($$, $3); O($$, OP_ADD) } | |
| | expr '*' expr { $$=$1; P($$, $3); O($$, OP_MUL) } | |
| | expr '/' expr { $$=$1; P($$, $3); O($$, OP_DIV) } | |
| | expr '%' expr { $$=$1; P($$, $3); O($$, OP_MOD) } | |
| | expr '&' expr { $$=$1; P($$, $3); O($$, OP_BIN_AND) } | |
| | expr '|' expr { $$=$1; P($$, $3); O($$, OP_BIN_OR) } | |
| | expr '#' expr { $$=$1; P($$, $3); O($$, OP_BIN_XOR) } | |
| | expr "&&" expr { $$=$1; P($$, $3); O($$, OP_LOG_AND) } | |
| | expr "||" expr { $$=$1; P($$, $3); O($$, OP_LOG_OR) } | |
| | expr "##" expr { $$=$1; P($$, $3); O($$, OP_LOG_XOR) } | |
| | expr '<' expr { $$=$1; P($$, $3); O($$, OP_NUM_LT) } | |
| | expr '>' expr { $$=$1; P($$, $3); O($$, OP_NUM_GT) } | |
| | expr "<=" expr { $$=$1; P($$, $3); O($$, OP_NUM_LE) } | |
| | expr ">=" expr { $$=$1; P($$, $3); O($$, OP_NUM_GE) } | |
| | expr "==" expr { $$=$1; P($$, $3); O($$, OP_NUM_EQ) } | |
| | expr "!=" expr { $$=$1; P($$, $3); O($$, OP_NUM_NE) } | |
| | expr "lt" expr { $$=$1; P($$, $3); O($$, OP_STR_LT) } | |
| | expr "gt" expr { $$=$1; P($$, $3); O($$, OP_STR_GT) } | |
| | expr "le" expr { $$=$1; P($$, $3); O($$, OP_STR_LE) } | |
| | expr "ge" expr { $$=$1; P($$, $3); O($$, OP_STR_GE) } | |
| | expr "eq" expr { $$=$1; P($$, $3); O($$, OP_STR_EQ) } | |
| | expr "ne" expr { $$=$1; P($$, $3); O($$, OP_STR_NE) } | |
| ; | ; |
| string_inside_quotes_value: maybe_codes { | |
| /* | $$=N(POOL); |
| complex_expr_value: complex_expr { | O($$, OP_CREATE_SWPOOL); /* stack: empty write context */ |
| $$=N(POOL); | P($$, $1); /* some code that writes to that context */ |
| O($$, OP_CREATE_SWPOOL); /* stack: empty write context * / | O($$, OP_REDUCE_SWPOOL); /* context=pop; stack: context.get_string() */ |
| P($$, $1); /* some codes to that context * / | |
| O($$, OP_REDUCE_SWPOOL); /* context=pop; stack: context.get_string() * / | |
| }; | }; |
| */ | |
| /* basics */ | /* basics */ |
| write_str_literal: STRING { | write_str_literal: STRING { |
| if(SLA2S($1)->size()) { | $$=$1; |
| $$=$1; | O($$, OP_WRITE); |
| O($$, OP_WRITE); | |
| } else { | |
| // optimized case of special end of macro. see yylex | |
| $$=N(POOL); | |
| } | |
| }; | |
| number: STRING { | |
| change_string_literal_to_double_literal($$=$1); | |
| }; | }; |
| empty_double_value: /* empty */ { $$=VL(NEW VDouble(POOL)) }; | empty_double_value: /* empty */ { $$=VL(NEW VDouble(POOL)) }; |
| Line 460 int yylex(YYSTYPE *lvalp, void *pc) { | Line 509 int yylex(YYSTYPE *lvalp, void *pc) { |
| char *begin=PC->source; | char *begin=PC->source; |
| char *end; | char *end; |
| int begin_line=PC->line; | int begin_line=PC->line; |
| int skip_analized=0; | |
| while(true) { | while(true) { |
| c=*(end=(PC->source++)); | c=*(end=(PC->source++)); |
| Line 480 int yylex(YYSTYPE *lvalp, void *pc) { | Line 530 int yylex(YYSTYPE *lvalp, void *pc) { |
| // append piece till ^ | // append piece till ^ |
| PC->string->APPEND(begin, end-begin, PC->file, begin_line); | PC->string->APPEND(begin, end-begin, PC->file, begin_line); |
| } | } |
| // reset piece 'start' position & line | // reset piece 'begin' position & line |
| begin=PC->source; // ^ | begin=PC->source; // ^ |
| begin_line=PC->line; | begin_line=PC->line; |
| // skip over ^ and _ | // skip over ^ and _ |
| Line 581 int yylex(YYSTYPE *lvalp, void *pc) { | Line 631 int yylex(YYSTYPE *lvalp, void *pc) { |
| break; | break; |
| // (EXPRESSION) | // (EXPRESSION) |
| case LS_EXPRESSION_BODY: | case LS_VAR_ROUND: |
| case LS_METHOD_ROUND: | |
| switch(c) { | switch(c) { |
| case ')': | case ')': |
| if(--lexical_brackets_nestage==0) | if(--lexical_brackets_nestage==0) |
| pop_LS(PC); //(EXPRESSION). | if(PC->ls==LS_METHOD_ROUND) // method round param ended |
| PC->ls=LS_METHOD_AFTER; // look for method end | |
| else // PC->ls==LS_VAR_ROUND // variable constructor ended | |
| pop_LS(PC); // return to normal life | |
| RC; | RC; |
| case '$': | case '$': |
| push_LS(PC, LS_VAR_NAME_IN_EXPRESSION); | push_LS(PC, LS_EXPRESSION_VAR_NAME); |
| RC; | RC; |
| case '^': | case '^': |
| push_LS(PC, LS_METHOD_NAME); | push_LS(PC, LS_METHOD_NAME); |
| Line 596 int yylex(YYSTYPE *lvalp, void *pc) { | Line 650 int yylex(YYSTYPE *lvalp, void *pc) { |
| case '(': | case '(': |
| lexical_brackets_nestage++; | lexical_brackets_nestage++; |
| RC; | RC; |
| case '+': case '-': case '*': case '/': case '%': | case '-': |
| case '!': case '~': | if(*PC->source=='f') { // -f |
| case '&': case '|': | skip_analized=1; |
| case '<': case '>': case '=': | result=FEXISTS; |
| } else | |
| result=c; | |
| goto break2; | |
| case '+': case '*': case '/': case '%': | |
| case '~': | |
| case ';': | case ';': |
| RC; | RC; |
| case '&': case '|': case '#': | |
| if(*PC->source==c) { // && || | |
| result=c=='#'?LXOR:c=='&'?LAND:LOR; | |
| skip_analized=1; | |
| } else | |
| result=c; | |
| goto break2; | |
| case '<': case '>': case '=': case '!': | |
| if(*PC->source=='=') { // <= >= == != | |
| skip_analized=1; | |
| switch(c) { | |
| case '<': result=NLE; break; | |
| case '>': result=NGE; break; | |
| case '=': result=NEQ; break; | |
| case '!': result=NNE; break; | |
| } | |
| } else | |
| result=c; | |
| goto break2; | |
| case '"': | case '"': |
| push_LS(PC, LS_EXPRESSION_STRING); | push_LS(PC, LS_EXPRESSION_STRING); |
| RC; | RC; |
| case 'l': case 'g': case 'e': case 'n': | case 'l': case 'g': case 'e': case 'n': |
| if(end==begin) // right after whitespace | if(end==begin) // right after whitespace |
| switch(char next_c=*PC->source) { | switch(*PC->source) { |
| // case '?': // ok [and bad cases, yacc would bark at them] | // case '?': // ok [and bad cases, yacc would bark at them] |
| case 't': // lt gt [et nt] | case 't': // lt gt [et nt] |
| result=c=='l'?SLT:c=='g'?SGT:BAD_STRING_COMPARISON_OPERATOR; | |
| skip_analized=1; | |
| goto break2; | |
| case 'e': // le ge ne [ee] | case 'e': // le ge ne [ee] |
| result=c=='l'?SLE:c=='g'?SGE:c=='n'?SNE:BAD_STRING_COMPARISON_OPERATOR; | |
| skip_analized=1; | |
| goto break2; | |
| case 'q': // eq [lq gq nq] | case 'q': // eq [lq gq nq] |
| PC->source++; PC->col++; | result=c=='e'?SEQ:BAD_STRING_COMPARISON_OPERATOR; |
| PC->pending_state=next_c; | skip_analized=1; |
| return c; | goto break2; |
| } | |
| break; | |
| case 'i': | |
| if(end==begin) // right after whitespace | |
| if(PC->source[0]=='n') { // in | |
| skip_analized=1; | |
| result=IN; | |
| goto break2; | |
| } | |
| break; | |
| case 'd': | |
| if(end==begin) // right after whitespace | |
| if(PC->source[0]=='e' && PC->source[1]=='f') { // def | |
| skip_analized=2; | |
| result=DEF; | |
| goto break2; | |
| } | } |
| break; | break; |
| case ' ': case '\t': case '\n': | case ' ': case '\t': case '\n': |
| if(end!=begin) { | if(end!=begin) { // there were a string after previous operator? |
| // append piece till whitespace | result=0; // return that string |
| PC->string->APPEND(begin, end-begin, PC->file, begin_line); | goto break2; |
| } | } |
| // reset piece 'start' position & line | // that's a leading|traling space or after-operator-space |
| begin=PC->source; // after whitespace | // ignoring it |
| // reset piece 'begin' position & line | |
| begin=PC->source; // after whitespace char | |
| begin_line=PC->line; | begin_line=PC->line; |
| continue; | continue; |
| } | } |
| Line 631 int yylex(YYSTYPE *lvalp, void *pc) { | Line 733 int yylex(YYSTYPE *lvalp, void *pc) { |
| // VARIABLE GET/PUT/WITH | // VARIABLE GET/PUT/WITH |
| case LS_VAR_NAME_SIMPLE: | case LS_VAR_NAME_SIMPLE: |
| case LS_VAR_NAME_IN_EXPRESSION: | case LS_EXPRESSION_VAR_NAME: |
| if(PC->ls==LS_VAR_NAME_IN_EXPRESSION) { | if(PC->ls==LS_EXPRESSION_VAR_NAME) { |
| // name in expr ends also before binary operators | // name in expr ends also before binary operators |
| switch(c) { | switch(c) { |
| case '+': case '-': case '*': case '/': case '%': | case '+': case '-': case '*': case '/': case '%': |
| Line 648 int yylex(YYSTYPE *lvalp, void *pc) { | Line 750 int yylex(YYSTYPE *lvalp, void *pc) { |
| case 0: | case 0: |
| case ' ': case '\t': case '\n': | case ' ': case '\t': case '\n': |
| case ';': | case ';': |
| case ']': case '}': | case ']': case '}': case ')': case '"': |
| pop_LS(PC); | pop_LS(PC); |
| PC->source--; if(--PC->col<0) { PC->line--; PC->col=-1; } | PC->source--; if(--PC->col<0) { PC->line--; PC->col=-1; } |
| result=EON; | result=EON; |
| Line 664 int yylex(YYSTYPE *lvalp, void *pc) { | Line 766 int yylex(YYSTYPE *lvalp, void *pc) { |
| PC->ls=LS_VAR_CURLY; | PC->ls=LS_VAR_CURLY; |
| lexical_brackets_nestage=1; | lexical_brackets_nestage=1; |
| } | } |
| RC; | RC; |
| case '(': | case '(': |
| PC->ls=LS_EXPRESSION_BODY; | PC->ls=LS_VAR_ROUND; |
| lexical_brackets_nestage=1; | lexical_brackets_nestage=1; |
| RC; | RC; |
| case '.': // name part delim | case '.': // name part delim |
| Line 742 int yylex(YYSTYPE *lvalp, void *pc) { | Line 844 int yylex(YYSTYPE *lvalp, void *pc) { |
| PC->ls=LS_METHOD_CURLY; | PC->ls=LS_METHOD_CURLY; |
| lexical_brackets_nestage=1; | lexical_brackets_nestage=1; |
| RC; | RC; |
| case '(': | |
| PC->ls=LS_METHOD_ROUND; | |
| lexical_brackets_nestage=1; | |
| RC; | |
| case '.': // name part delim | case '.': // name part delim |
| case '$': // name part subvar | case '$': // name part subvar |
| case ':': // ':name' or 'class:name' | case ':': // ':name' or 'class:name' |
| Line 792 int yylex(YYSTYPE *lvalp, void *pc) { | Line 898 int yylex(YYSTYPE *lvalp, void *pc) { |
| break; | break; |
| case LS_METHOD_AFTER: | case LS_METHOD_AFTER: |
| if(c=='[') {/* )( }( */ | if(c=='[') {/* ][ }[ )[ */ |
| PC->ls=LS_METHOD_SQUARE; | PC->ls=LS_METHOD_SQUARE; |
| lexical_brackets_nestage=1; | lexical_brackets_nestage=1; |
| RC; | RC; |
| } | } |
| if(c=='{') {/* ){ }{ */ | if(c=='{') {/* ]{ }{ ){ */ |
| PC->ls=LS_METHOD_CURLY; | PC->ls=LS_METHOD_CURLY; |
| lexical_brackets_nestage=1; | lexical_brackets_nestage=1; |
| RC; | RC; |
| } | } |
| if(c=='(') {/* ]( }( )( */ | |
| PC->ls=LS_METHOD_ROUND; | |
| lexical_brackets_nestage=1; | |
| RC; | |
| } | |
| pop_LS(PC); | pop_LS(PC); |
| PC->source--; if(--PC->col<0) { PC->line--; PC->col=-1; } | PC->source--; if(--PC->col<0) { PC->line--; PC->col=-1; } |
| result=EON; | result=EON; |
| Line 814 int yylex(YYSTYPE *lvalp, void *pc) { | Line 925 int yylex(YYSTYPE *lvalp, void *pc) { |
| } | } |
| break2: | break2: |
| if(begin==end) | if(end!=begin) { // there is last piece? |
| return result; | if((c=='@' || c==0) && end[-1]=='\n') { // we are before LS_DEF_NAME or EOF? |
| else { | // strip last \n |
| PC->pending_state=result; | |
| // strip last \n before LS_DEF_NAME or EOF | |
| if((c=='@' || c==0) && end[-1]=='\n') | |
| end--; | end--; |
| if(end!=begin) { | } |
| // append last piece | if(end!=begin) { // last piece still alive? |
| // append it | |
| PC->string->APPEND(begin, end-begin, PC->file, begin_line/*, start_col*/); | PC->string->APPEND(begin, end-begin, PC->file, begin_line/*, start_col*/); |
| } | } |
| } | |
| if(PC->string->size()) { // something accumulated? | |
| // create STRING value: array of OP_VALUE+vstring | // create STRING value: array of OP_VALUE+vstring |
| *lvalp=VL(NEW VString(*PC->string)); | *lvalp=VL(NEW VString(*PC->string)); |
| // new pieces storage | // new pieces storage |
| PC->string=NEW String(POOL); | PC->string=NEW String(POOL); |
| // go! | // make current result be pending for next call, return STRING for now |
| return STRING; | PC->pending_state=result; result=STRING; |
| } | |
| if(skip_analized) { | |
| PC->source+=skip_analized; PC->col+=skip_analized; | |
| } | } |
| return result; | |
| } | } |
| int real_yyerror(parse_control *pc, char *s) /* Called by yyparse on error */ | int real_yyerror(parse_control *pc, char *s) /* Called by yyparse on error */ |