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POUsing $x to grab string from rule
primarykey
Id
3539498
data
AcceptedAnswerId
3541403
AnswerCount
3
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2010-08-21T23:47:21.290
FavoriteCount
0
LastActivityDate
2013-05-06T12:33:32.893
LastEditDate
2013-05-06T12:33:32.893
LastEditorUserId
360899
OwnerUserId
427338
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0
PostTypeId
1
Score
0
ViewCount
280
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text
Body
I'm trying to do something like this in Bison... <pre><code>loop_for: FOR var_name COLONEQUALS expression TO {printf("%s<=", $2);} expression STEP {printf("%s+=", $2);} expression {printf(")\n");} Code ENDFOR </code></pre> What I'm trying to do is convert a for statement from the fake language's syntax to C's. However, the $2 I've used to grab var_name doesn't seem to work as the program crashes when it reaches there. Is $x supposed to work only for integers? I even tried adding a union and using char* for a new type, but I still get (null) from the above actions. EDIT: I tried to fix it using the hints from the questions that were provided, but I still can't get it perfect. FLEX rules in question: <pre><code>"FOR" {printf("for ("); lisnew=0; return FOR;} "TO" {printf("; "); return TO;} "STEP" {printf("; "); return STEP;} "ENDFOR" {printf("\n"); t--; instabs(); printf("}\n"); instabs(); lisnew=1; return ENDFOR;} [a-zA-Z]+ {printf("%s",yytext); lisnew=0; yylval.strV = yytext; return CHARACTERS;} ":=" {printf("="); lisnew=0; return COLONEQUALS;} </code></pre> BISON rules: <pre><code>loop_for: FOR var_name {strcpy(myvar, $<strV>2);} COLONEQUALS expression TO {printf("%s<=", myvar);} expression STEP {printf("%s+=", myvar);} expression {printf(")\n");} Code ENDFOR var_name: name_first_is_char name_first_is_char: character | character name2 name2: | character name2 | digit name2 </code></pre> Thing is, for input: <pre><code>FOR i := 0 TO 10 STEP 1 </code></pre> I get as output: <pre><code>for ( i = 0 ; i :=<= 10 ; i :=+= 1 </code></pre> Can't I avoid having the := symbols getting in the strV? EDIT 2: I tried again, this time with <pre><code>var_name: name_first_is_char {memset(myvar, '\0', BUFFER_LENGTH); sprintf(myvar, "%s", $<strV>1);} </code></pre> But still the next few characters get in myvar.
Tags
<string><bison><flex-lexer>
Title
Using $x to grab string from rule
singulars
PostAcceptedAnswerId
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
PostParentId
1. This table or related slice is empty.
PostTypePostTypeId
1. PTQuestion
UserLastEditorUserId
1. USlesmana
UserOwnerUserId
1. USLefteris Aslanoglou
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PostLinksPostIdRelatedPostId
1. PL
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 LTLinked
2. PL
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 LTLinked
PostLinksRelatedPostIdPostId
1. PL
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PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
2. PO
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3. PO
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1. This table or related slice is empty.
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