html - Fencepost issue: I need a recursive function that skips executing a section when it is first called -



html - Fencepost issue: I need a recursive function that skips executing a section when it is first called -

i'm trying create c++ programme creates formatted css file.

what first take html file , build tree nodes of next type.

struct node { std::string element_type; std::vector<std::string> class_list; std::string iden; std::vector<node*> children; };

right i'm trying create function takes root of tree , returns string formatted css of document (with attributes it's looking @ beingness css classes , ids).

for example, if html file

<html> <body> <div class="row"> <h1 id="title">here's title</h1> </div> <div class="row red"> <p>here's text within div of class row , red</p> </div> <div class="row"> <a href="google.com">cool, can click here go google</a> </row> </body> </html>

then, after had been made tree, have function

std::string doctree::_tree2str(node * rt)

which intend have homecoming string

html {} html > body {} html > body > div.row {} html > body > div.row > h1#title {} html > body > div.row > {} html > body > div.row.red {} html > body > div.row.red > p {}

here's implementation of function:

std::string doctree::_tree2str(node * rt) { std::string css(""); if (rt) { css.append(rt->element_type); if (!rt->class_list.empty()) { (std::vector<std::string>::iterator it(rt->class_list.begin()), offend(rt->class_list.end()); != offend; ++it) { css.append("." + *it); } } if (!rt->iden.empty()) { css.append("#" + rt->iden); } if (!rt->children.empty()) { (std::vector<node*>::iterator it(rt->children.begin()), offend(rt->children.end()); != offend; ++it) { css.append("\n\t" + _tree2str(*it)); } } } homecoming css; }

the thing i've skipped " > " because don't how work recursive function. should printed @ origin of function every time function called except first time.

also, there might other logical fallacies. can help me out here?

you can create private _innertree2str(node * rt, bool printgt) method contains contents of _tree2str method, plus line if(printgt) css.append(" > "); @ top. calls _tree2str(node) become calls _innertree2str(node, true)

then _tree2str becomes

std::string doctree::_tree2str(node * rt) { homecoming _innertree2str(rt, false); }

this way first time phone call _innertree2str printgt variable false , won't append " > ", every other time printgt true

rather creating sec method instead add together printgt parameter straight _tree2str, you'll relying on caller remember pass in false printgt parameter

html c++ css algorithm recursion

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