simple-expressions
v0.0.12
Published
Simple expression parsing and execution
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Readme
npm
npm i simple-expressions
Supported script operators
- not
- eq
- or
- and
- contains
- gt
- lt
- empty
Constants
- true
- false
- any numbers
- anything else that isn't recognized will be a string constant
Model references
You can reference model fields by using #
.
Nested properties work too but beware that the model will be flattened before executing.
Samples
import { executeExpression } from 'simple-expressions';
console.log('TRUE results in ' + executeExpression({}, 'true'));
console.log('FALSE results in ' + executeExpression({}, 'False'));
const model = {
'2': 2
};
const expr = ' and( not(eq(#2, 5)), lt(#2, 10) ) ';
const result = executeExpression(model, expr);
console.log(`'${expr}' for ${JSON.stringify(model)} results in ${result}`);
const model2 = {
'2': 12
};
const expr2 = ' and( not(eq(#2, 5)), lt(#2, 10) ) ';
const result2 = executeExpression(model2, expr2);
console.log(`'${expr2}' for ${JSON.stringify(model2)} results in ${result2}`);
const expr3 = ' true ';
const result3 = executeExpression({}, expr3);
console.log(`'${expr3}' for ${JSON.stringify({})} results in ${result3}`);
const expr4 = ' false ';
const result4 = executeExpression({}, expr4);
console.log(`'${expr4}' for ${JSON.stringify({})} results in ${result4}`);
const expr5 = ' or (true, false ) ';
const result5 = executeExpression({}, expr5);
console.log(`'${expr5}' for ${JSON.stringify({})} results in ${result5}`);
const expr6 = ' AND (TRUE, FALSE ) ';
const result6 = executeExpression({}, expr6);
console.log(`'${expr6}' for ${JSON.stringify({})} results in ${result6}`);
const expr7 = ' AND (TRUE, 0 ) ';
const result7 = executeExpression({}, expr7);
console.log(`'${expr7}' for ${JSON.stringify({})} results in ${result7}`);
const expr8 = ' AND (TRUE, "blub" ) ';
const result8 = executeExpression({}, expr8);
console.log(`'${expr8}' for ${JSON.stringify({})} results in ${result8}`);
const model9 = {
text: 'test'
};
const expr9 = ' AND (TRUE, not( empty( #text )) ) ';
const result9 = executeExpression(model9, expr9);
console.log(`'${expr9}' for ${JSON.stringify(model9)} results in ${result9}`);
const model10 = {
text: ''
};
const expr10 = ' AND (TRUE, not( empty( #text )) ) ';
const result10 = executeExpression(model10, expr10);
console.log(`'${expr10}' for ${JSON.stringify(model10)} results in ${result10}`);
const model11 = {};
const expr11 = ' AND (TRUE, not( empty( #text )) ) ';
const result11 = executeExpression(model11, expr11);
console.log(`'${expr11}' for ${JSON.stringify(model11)} results in ${result11}`);
const model12 = {
text: {
'innerText': 'test'
}
};
const expr12 = ' AND (TRUE, not( empty( #text.innerText )) ) ';
const result12 = executeExpression(model12, expr12);
console.log(`'${expr12}' for ${JSON.stringify(model12)} results in ${result12}`);
const expr13 = ' AND (TRUE, empty( #text.innerText ) ) ';
const result13 = executeExpression(model12, expr13);
console.log(`'${expr13}' for ${JSON.stringify(model12)} results in ${result13}`);
Results:
true results in true
false results in false
' and( not(eq(#2, 5)), lt(#2, 10) ) ' for {"2":2} results in true
' and( not(eq(#2, 5)), lt(#2, 10) ) ' for {"2":12} results in false
' true ' for {} results in true
' false ' for {} results in false
' or (true, false ) ' for {} results in true
' AND (true, false ) ' for {} results in false
' AND (true, 0 ) ' for {} results in false
' AND (true, "blub" ) ' for {} results in true
' AND (true, not( empty( #text )) ) ' for {"text":"test"} results in true
' AND (true, not( empty( #text )) ) ' for {"text":""} results in false
' AND (true, not( empty( #text )) ) ' for {} results in false
' AND (true, not( empty( #text.innerText )) ) ' for {"text":{"innerText":"test"}} results in true
' AND (true, empty( #text.innerText ) ) ' for {"text":{"innerText":"test"}} results in false