sme

Simple math evaluation

Build

To run tests, run make tests then run ./test

Runing 4 tests:

1) TOKENIZER: Passed
2) PARSER:    Passed
3) EVALUATOR: Passed
4) VARIABLES: Passed

Runs: 4 Passes: 4 Fails: 0

To run repl, run make repl then run ./repl

Simple math evaluator
To add variable type (:name=value)
To quit type (quit)

sme>

Usage

Just calculate some math

To do a simple calculation, you only need to call the sme_calc(char*, SMEList*) function.

double res = sme_calc("2+3", NULL);

Use variables

To use variables, first create an instance of SMElist* then append a variable to the list use append_SMEItem(SMElist*, SMEVar*). To create a variable use new_SMEVar(char*, double).

SMEList* vars = new_SMEList();
append_SMEItem(vars, new_SMEVar("a", 3.4));
append_SMEItem(vars, new_SMEVar("b", 4.2069));
double res = sme_calc("2 + 3 * a + b", vars);

Access toknens and nodes

To get access to the tokens and nodes, you will first have to create an instance of tokenizer using new_SMETokenizer(char*, SMEList*). That will then generate a list of tokens as well, then to get the nodes run sme_parse(SMETokenizer*). Lastly, to run the calculation pass, the root node to sme_eval

SMEList* vars = new_SMEList();
append_SMEItem(vars, new_SMEVar("a", 3.4));

SMETokenizer* tokenizer = new_SMETokenizer("2+3 * a", vars);
SMENode* root = sme_parse(tokenizer);

double res = sme_eval(root);

free_SMETokenizer(tokenizer);
free_SMENode(root);

Operators

• Binary
  • +
  • -
  • *
  • /
• unary
  • - Negates number.
  • + Makes the result positive if it is negative.
  • floor Rounds down number.
  • ceil Rounds up number.
• Other
  • ( Starts a collection.
  • ) Ends a collection.