/
prstst.js
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/
prstst.js
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const path=require("node:path");
const prs=require(path.join(__dirname,"prs.js"));
const test =require("node:test");
const assert =require('node:assert');
function makeParser() {
let number = prs.makeRegexParser(/^[\+\-]?[0-9]+([\.][0-9]+)?([eE][\+\-]?[0-9]+)?/, "number")
let forwardExpression = new prs.makeForwarder();
let nestedExpr =
prs.makeSequenceParser([
prs.makeTokenParser("("),
forwardExpression.forward(),
prs.makeTokenParser(")"),
]);
let signedNumber = prs.makeAlternativeParser([
prs.makeSequenceParser([
prs.makeTokenParser("-"),
number
]),
number
]);
let primaryExpr = prs.makeAlternativeParser(
[
signedNumber,
nestedExpr
],
"primary expression");
let multOperator = prs.makeAlternativeParser([
prs.makeTokenParser("/"),
prs.makeTokenParser("*"),
prs.makeTokenParser("%"),
], "multiplication operator");
let multExpression =
prs.makeRepetitionRecClause(
primaryExpr,
prs.makeSequenceParser([
multOperator,
primaryExpr
], "multiplication expression"),
"multiplication expression",
);
let addOperator = prs.makeAlternativeParser([
prs.makeTokenParser("+"),
prs.makeTokenParser("-"),
], "add/subst operator");
let forwardLambdaFunctionDef = new prs.makeForwarder();
let addExpression =
prs.makeRepetitionRecClause(
multExpression,
prs.makeSequenceParser([
addOperator,
multExpression,
], "add expression"),
"add expression");
let relationOperator = prs.makeAlternativeParser([
prs.makeTokenParser(">="),
prs.makeTokenParser("<="),
prs.makeTokenParser("<"),
prs.makeTokenParser(">")
])
let relationalExpression =
prs.makeRepetitionRecClause(
addExpression,
prs.makeSequenceParser([
relationOperator,
addExpression
]),
"relation expression",
true
);
let equalityOperator = prs.makeAlternativeParser([
prs.makeTokenParser("=="),
prs.makeTokenParser("!=")
]);
let equalityExpression =
prs.makeRepetitionRecClause(
relationalExpression,
prs.makeSequenceParser([
equalityOperator,
relationalExpression
]),
"equality expression",
true
);
let logicInversion = prs.makeAlternativeParser([
prs.makeSequenceParser([
prs.makeTokenParser("not"),
equalityExpression
]),
equalityExpression
]);
let logicalConjunction = prs.makeRepetitionRecClause(
logicInversion,
prs.makeSequenceParser([
prs.makeTokenParser("and"),
logicInversion
], "andExpr", true));
let logicalDisjunction =
prs.makeRepetitionRecClause(
logicalConjunction,
prs.makeSequenceParser([
prs.makeTokenParser("or"),
logicalConjunction
]), "or expression", true);
let expression = prs.makeAlternativeParser([
logicalDisjunction,
forwardLambdaFunctionDef.forward()
])
forwardExpression.setInner(expression);
return prs.makeConsumeAll(expression);
}
let parser = makeParser();
test.test('arithmetic expr', (t) => {
// This test passes because it does not throw an exception.
let result = prs.parseString(parser, "3*2+1*4-5");
let json = JSON.stringify(result);
//console.log(json);
assert(json == "[[[\"3\",[\"*\",\"2\"]],[\"+\",[\"1\",[\"*\",\"4\"]]],[\"-\",[\"5\"]]]]")
});
test.test('arithmetic expr with ()', (t) => {
// This test passes because it does not throw an exception.
let result = prs.parseString(parser, " (2*3)+(4*5)");
let json = JSON.stringify(result);
assert(json=="[[[[\"(\",[[[\"2\",[\"*\",\"3\"]]]],\")\"]],[\"+\",[[\"(\",[[[\"4\",[\"*\",\"5\"]]]],\")\"]]]]]");
result = prs.parseString(parser, " 2*3+4*5");
json = JSON.stringify(result);
assert(json=="[[[\"2\",[\"*\",\"3\"]],[\"+\",[\"4\",[\"*\",\"5\"]]]]]");
});
test.test('arithmetic expr with relation', (t) => {
let result = prs.parseString(parser, " (2*3)+(4*5) > 100");
let json = JSON.stringify(result);
assert(json == "[[[[\"(\",[[[\"2\",[\"*\",\"3\"]]]],\")\"]],[\"+\",[[\"(\",[[[\"4\",[\"*\",\"5\"]]]],\")\"]]],\">\",[[\"100\"]]]]");
});
test.test('arithmetic expr with logical op', (t) => {
let result = prs.parseString(parser, " 2 < 3 and 3 < 10 or 5 != 10");
let json = JSON.stringify(result);
assert(json == "[[[\"2\"],\"<\",[[\"3\"]]],[\"and\",[\"3\"],\"<\",[[\"10\"]]],\"or\",[[[\"5\"],\"!=\",[[\"10\"]]]]]");
});