@ -31,28 +31,28 @@ This command will create the parser from the `examples/arithmetics.pegjs` file a
To use the parser in a web page, follow the following example:
<!DOCTYPE html>
< head >
< title > Arithmetics Parser Example< / title >
< script src = "examples/arithmetics.js" > < / script > <!-- Include the parser. -->
< script >
function calculate(expression) {
/* Use the parser to compute a value of an arithmetic expression. */
var result;
try {
result = arithmeticsParser.parse(document.getElementById("expression").value);
} catch (e) {
result = e.message;
<!DOCTYPE html>
< head >
< title > Arithmetics Parser Example< / title >
< script src = "examples/arithmetics.js" > < / script > <!-- Include the parser. -->
< script >
function calculate(expression) {
/* Use the parser to compute a value of an arithmetic expression. */
var result;
try {
result = arithmeticsParser.parse(document.getElementById("expression").value);
} catch (e) {
result = e.message;
}
document.getElementById("result").innerText = result;
}
document.getElementById("result").innerText = result;
}
< / script >
< / head >
< body >
< input type = "text" id = "expression" value = "2*(3+4)" >
< input type = "button" id = "calculate" value = "Calculate" onclick = "calculate();" >
< div id = "result" > < / div >
< / body >
< / script >
< / head >
< body >
< input type = "text" id = "expression" value = "2*(3+4)" >
< input type = "button" id = "calculate" value = "Calculate" onclick = "calculate();" >
< div id = "result" > < / div >
< / body >
The `parse` method of the generated parser will return either the result of the parsing (dependent on the actions you specified in the grammar) or throw `PEG.Parser.SyntaxError` exception if the input contains a syntax error. The exception has properties `message` , `line` and `column` , which contain details about the error.
David Majda
15 years ago