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exprs_test.nix
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#!/usr/bin/env -S nix-instantiate --eval
with builtins;
let
ftests = (import ./ftests.nix);
exprs = (import ./exprs.nix);
tests = [
{
descr = ''parse ""'';
fun = exprs.parse;
args = "";
expected = {
err = "unexpected EOF";
s = "";
p = 0;
expr = {};
};
}
{
descr = ''parse "3"'';
fun = exprs.parse;
args = "3";
expected = {
err = null;
s = "3";
p = 1;
expr = { type = "Num"; val = 3; };
};
}
{
descr = ''parse "3.42"'';
fun = exprs.parse;
args = "3.42";
expected = {
err = null;
s = "3.42";
p = 4;
expr = { type = "Num"; val = 3.42; };
};
}
{
descr = ''parse "((3.42))"'';
fun = exprs.parse;
args = "((3.42))";
expected = {
err = null;
s = "((3.42))";
p = 8;
expr = { type = "Num"; val = 3.42; };
};
}
{
descr = ''parse "((3.42"'';
fun = exprs.parse;
args = "((3.42";
expected = {
err = "expecting ')'";
s = "((3.42";
p = 6;
expr = { type = "Num"; val = 3.42; };
};
}
{
descr = ''parse "( ( 3.42"'';
fun = exprs.parse;
args = "( ( 3.42";
expected = {
err = "expecting ')'";
s = "( ( 3.42";
p = 10;
expr = { type = "Num"; val = 3.42; };
};
}
{
descr = ''parse "aa12"'';
fun = exprs.parse;
args = "aa12";
expected = {
err = "digit/dot expected, got 'a'";
s = "aa12";
p = 0;
expr = {};
};
}
# Not so great I guess?
{
descr = ''parse "12aa"'';
fun = exprs.parse;
args = "12aa";
expected = {
err = null;
s = "12aa";
p = 2;
expr = { type = "Num"; val = 12; };
};
}
{
descr = ''parse "-3"'';
fun = exprs.parse;
args = "-3";
expected = {
err = null;
s = "-3";
p = 2;
expr = {
type = "Unary";
sgn = -1;
expr = { type = "Num"; val = 3; };
};
};
}
{
descr = ''parse "-(3)"'';
fun = exprs.parse;
args = "-(3)";
expected = {
err = null;
s = "-(3)";
p = 4;
expr = { type = "Unary"; sgn = -1; expr = { type = "Num"; val = 3; }; };
};
}
{
descr = ''parse "-(-(3.42 ))"'';
fun = exprs.parse;
args = "-(-(3.42 ))";
expected = {
err = null;
s = "-(-(3.42 ))";
p = 12;
expr = {
type = "Unary";
sgn = -1;
expr = {
type = "Unary";
sgn = -1;
expr = { type = "Num"; val = 3.42; };
};
};
};
}
{
descr = ''parse "- - 3.42"'';
fun = exprs.parse;
args = "- - 3.42";
expected = {
err = null;
s = "- - 3.42";
p = 10;
expr = {
type = "Unary";
sgn = -1;
expr = {
type = "Unary";
sgn = -1;
expr = { type = "Num"; val = 3.42; };
};
};
};
}
{
descr = ''parse "+(+(3.42 ))"'';
fun = exprs.parse;
args = "+(+(3.42 ))";
expected = {
err = null;
s = "+(+(3.42 ))";
p = 12;
expr = { type = "Num"; val = 3.42; };
};
}
{
descr = ''parse "+ +3.42"'';
fun = exprs.parse;
args = "+ +3.42";
expected = {
err = null;
s = "+ +3.42";
p = 9;
expr = { type = "Num"; val = 3.42; };
};
}
{
descr = ''parse "1 + +3.42"'';
fun = exprs.parse;
args = "1 + +3.42";
expected = {
err = null;
s = "1 + +3.42";
p = 11;
expr = {
type = "Term";
op = "+";
left = { type = "Num"; val = 1; };
right = { type = "Num"; val = 3.42; };
};
};
}
{
descr = ''parse "+ +3.42 + -2.25"'';
fun = exprs.parse;
args = "+ +3.42 + -2.25";
expected = {
err = null;
s = "+ +3.42 + -2.25";
p = 17;
expr = {
type = "Term";
op = "+";
left = { type = "Num"; val = 3.42; };
right = {
type = "Unary";
sgn = -1;
expr = { type = "Num"; val = 2.25; };
};
};
};
}
# We definitely don't want this to be parsed
# as 1 - (42+12); meaning, + & - are left associative
{
descr = ''parse "1 - 42 + 12"'';
fun = exprs.parse;
args = "1 - 42 + 12";
expected = {
err = null;
s = "1 - 42 + 12";
p = 11;
expr = {
type = "Term";
op = "+";
left = {
type = "Term";
op = "-";
left = { type = "Num"; val = 1; };
right = { type = "Num"; val = 42; };
};
right = { type = "Num"; val = 12; };
};
};
}
{
descr = ''parse "1 + 42 * 12"'';
fun = exprs.parse;
args = "1 + 42 * 12";
expected = {
err = null;
s = "1 + 42 * 12";
p = 11;
expr = {
type = "Term";
op = "+";
left = { type = "Num"; val = 1; };
right = {
type = "Factor";
op = "*";
left = { type = "Num"; val = 42; };
right = { type = "Num"; val = 12; };
};
};
};
}
{
descr = ''parse "1- 3 * 5 + (1 + 34 )/ 3."'';
fun = exprs.parse;
args = "1- 3 * 5 + (1 + 34 )/ 3.";
expected = {
err = null;
s = "1- 3 * 5 + (1 + 34 )/ 3.";
p = 25;
expr = (exprs.mkTerm
(exprs.mkTerm
(exprs.mkNum 1)
"-"
(exprs.mkFact (exprs.mkNum 3) "*" (exprs.mkNum 5)))
"+"
(exprs.mkFact
(exprs.mkTerm (exprs.mkNum 1) "+" (exprs.mkNum 34))
"/"
(exprs.mkNum 3.)));
};
}
{
descr = ''parse "0 / 78 * 12"'';
fun = exprs.parse;
args = "0 / 78 * 12";
expected = {
err = null;
s = "0 / 78 * 12";
p = 11;
expr = {
type = "Factor";
op = "*";
left = {
type = "Factor";
op = "/";
left = { type = "Num"; val = 0; };
right = { type = "Num"; val = 78; };
};
right = { type = "Num"; val = 12; };
};
};
}
{
descr = ''parse "1 + 3 * 5 + ( 1 - 34 )"'';
fun = exprs.parse;
args = "1 + 3 * 5 + ( 1 - 34 )";
expected = {
err = null;
s = "1 + 3 * 5 + ( 1 - 34 )";
p = 22;
expr = (exprs.mkTerm
(exprs.mkTerm
(exprs.mkNum 1)
"+"
(exprs.mkFact (exprs.mkNum 3) "*" (exprs.mkNum 5)))
"+"
(exprs.mkTerm (exprs.mkNum 1) "-" (exprs.mkNum 34)));
};
}
{
descr = ''exec "pre-parsed 1+3*5+(1-34)"'';
fun = exprs.exec;
args = {
type = "Term";
op = "+";
left = { type = "Num"; val = 1; };
right = {
type = "Term";
op = "+";
left = {
type = "Factor";
op = "*";
left = { type = "Num"; val = 3; };
right = { type = "Num"; val = 5; };
};
right = {
type = "Term";
op = "-";
left = { type = "Num"; val = 1; };
right = { type = "Num"; val = 34; };
};
};
};
expected = 1+3*5+(1-34);
}
{
descr = ''exec (parse "2*(3+(2+4*5)-78+-12)")'';
fun = exprs.exec;
args = (exprs.parse "2*(3+(2+4*5)-78+-12)").expr;
expected = 2*(3+(2+4*5)-78+-12);
}
];
in ftests.run tests