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Feature/grammar tree #10

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a78705e
add grammar tree support
Apr 28, 2016
dfbbb22
turn grammar tree to expression.
Apr 28, 2016
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66 changes: 52 additions & 14 deletions index.js
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64 changes: 51 additions & 13 deletions rule.jison
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Original file line number Diff line number Diff line change
Expand Up @@ -60,6 +60,7 @@
%start expressions
%parse-param data
%parse-param validator
%parse-param grammar

%% /* language grammar */

Expand All @@ -70,27 +71,27 @@ expressions

e
: e OR e
{$$ = $1 || $3;}
{$$ = !grammar ? ($1 || $3) : [$1, 'or', $3];}
| e AND e
{$$ = $1 && $3;}
{$$ = !grammar ? ($1 && $3) : [$1, 'and', $3];}
| NOT e
{$$ = !$2;}
{$$ = !grammar ? !$2 : [$2, 'not', null];}
| term '=' term
{$$ = $1 === $3;}
{$$ = !grammar ? ($1 === $3) : [$1, 'eq', $3];}
| term '<>' term
{$$ = $1 !== $3;}
{$$ = !grammar ? ($1 !== $3) : [$1, 'neq', $3];}
| term IN term
{$$ = validator ? validator.in($1, $3) : $3.indexOf($1) !== -1}
{$$ = validator ? validator.in($1, $3) : (!grammar ? ($3.indexOf($1) !== -1) : [$1, 'in', $3])}
| term NOT_IN term
{$$ = validator ? validator.not_in($1, $3) : $3.indexOf($1) === -1}
{$$ = validator ? validator.not_in($1, $3) : (!grammar ? ($3.indexOf($1) === -1) : [$1, 'nin', $3])}
| term '>' term
{$$ = $1 > $3;}
{$$ = !grammar ? $1 > $3 : [$1, 'gt', $3];}
| term '>=' term
{$$ = $1 >= $3;}
{$$ = !grammar ? $1 >= $3 : [$1, 'gte', $3];}
| term '<' term
{$$ = $1 < $3;}
{$$ = !grammar ? $1 < $3 : [$1, 'lt', $3];}
| term '<=' term
{$$ = $1 <= $3;}
{$$ = !grammar ? $1 <= $3 : [$1, 'lte', $3];}
| '(' e ')'
{$$ = $2;}
;
Expand All @@ -99,7 +100,7 @@ term
: NUMBER
{$$ = validator ? validator.number(Number(yytext)) : Number(yytext);}
| VARIABLE
{$$ = validator ? validator.variable(yytext, data) : data[yytext];}
{$$ = validator ? validator.variable(yytext, data) : !grammar ? data[yytext]: yytext;}
| STRING
{$$ = validator ? validator.string(JSON.parse(yytext)) : JSON.parse(yytext);}
| ARRAY
Expand All @@ -112,4 +113,41 @@ term

function splitArray(input){
return input.replace(/\[|\]+/g,'').split(',').map(function(item){return item ? JSON.parse(item.trim()): ''});
}
}

function _g() { return typeof grammar === 'undefined'; }
function _v() { return typeof validator !== 'undefined'; }

function isExpr(input) {
return Array.isArray(input) && input.length === 3;
}

function toValue(input) {
if (input instanceof Date) return (input.getMonth() + 1) + '/' + input.getDate() + '/' + input.getFullYear();
return JSON.stringify(input);
}

function generate(input) {
var lhs = isExpr(input[0]) ? generate(input[0]) : input[0];
var op = input[1];
var rhs = isExpr(input[2]) ? generate(input[2]) : toValue(input[2]);

var _s = function(str) { return str; };
switch (op) {
case 'not' : return _s('!(' + lhs + ')');
case 'eq' : return _s(lhs + ' = ' + rhs);
case 'neq' : return _s(lhs + ' <> ' + rhs);
case 'in' : return _s(lhs + ' in ' + rhs);
case 'nin' : return _s(lhs + ' not in ' + rhs);
case 'gt' : return _s(lhs + ' > ' + rhs);
case 'gte' : return _s(lhs + ' >= ' + rhs);
case 'lt' : return _s(lhs + ' < ' + rhs);
case 'lte' : return _s(lhs + ' <= ' + rhs);
case 'and' : return _s('(' + lhs + ' and ' + rhs + ')');
case 'or' : return _s('(' + lhs + ' or ' + rhs + ')');
default:
throw new Error('do not recognize:' + lhs + ', ' + op + ', ' + rhs);
}
}

exports.generate = generate;