edn lib for c++.
##intro
Useful for parsing edn. read returns an edn::EdnNode. There are three cases to consider:
-
If it is an atom (nil, symbol, keyword, bool, int, float, string, char) it will have a
valueproperty which is a string you can then cast/coerce how you please. -
If it is a collection (list, map, vector, set) it will have a
valuesproperty which is itself a list ofedn::EdnNodeitems which you can then walk via what ever mechanism and do with them what you will. -
If it is a tagged item you will have the raw tagname in the
valueproperty and then thevaluesproperty will be a list containing theedn::EdnNoderepresenting the tagname and anotheredn::EdnNodecontaining the value for the tag.
In general edn-cpp makes no assumptions about how you want to reify the data - it just guarantees you have well formed edn node(s) which you can handle how ever you like.
##using
#//define DEBUG
#include "edn.hpp"
#include <iostream>
using edn::EdnNode;
using edn::read;
using edn::pprint;
int main() {
try {
EdnNode someMap = read("{:some :map :with [a vector of symbols]}");
std::cout << pprint(someMap) << std::endl;
} catch (const char* e) {
std::cout << "Error parsing: " << e << std::endl;
}
}
will output:
{:some :map :with [a vector of symbols]}
And with debug uncommented:
<EdnMap {<EdnKeyword :some> <EdnKeyword :map>
<EdnKeyword :with> <EdnVector [<EdnSymbol a>
<EdnSymbol vector>
<EdnSymbol of>
<EdnSymbol symbols>]>}>
##debug If you define DEBUG you will see debug output when using pprint. This looks like:
<EdnMap {
<EdnKeyword :x> <EdnKeyword :y>
<EdnKeyword :z> <EdnVector [<EdnInt 1>
<EdnInt 2>
<EdnInt 3>
<EdnTagged #<EdnSymbol tagged/item>
<EdnString "cats-rabbits-bears">>]>}>
Which is nice when proving things are parsing as you expect.
##api list lex(string ednString)
EdnNode read(string ednString)
string pprint(EdnNode node)
bool validSymbol(string value)
bool validKeyword(string value)
bool validNil(string value)
bool validBool(string value)
bool validInt(string value)
bool validFloat(string value)
bool validChar(string value)
EdnNode handleAtom(EdnToken token)
EdnNode handleCollection(EdnToken token, list<EdnNode> values)
EdnNode handleTagged(EdnToken token, EdnNode value)
##structs EdnToken TokenType type int line string value
EdnNode
EdnToken type
int line
string value #used for atoms
list<EdnNode> values #used for collections
##enums TokenType TokenString TokenAtom TokenParen
NodeType
EdnNil
EdnSymbol
EdnKeyword
EdnBool
EdnInt
EdnFloat
EdnString
EdnChar
EdnList
EdnVector
EdnMap
EdnSet
EdnDiscard
EdnTagged
##todo make pprint actually format as demonstrated above. Right now it is just a single string with out the indentation.
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