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1968ed83ee5801f4dd41ba2ffd19378fb45586d6
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Author SHA1 Message Date
patrick 1968ed83ee Refactor precedence rules for formulas 2020-04-09 16:07:31 +02:00
patrick d1ab7963b1 Before larger refactoring 2020-04-09 16:07:31 +02:00
patrick 1a497254a8 Add unit tests for precedence-0 formulas and lower 2020-04-09 16:07:31 +02:00
patrick d57b3b3b62 Test remaining formula types 2020-04-09 16:07:31 +02:00
patrick 57d568916f Minor formatting 2020-04-09 16:07:31 +02:00
patrick e4fe047aba Start testing formula formatter 2020-04-09 16:07:31 +02:00
patrick 600a6a1b4b Refactor precedence rules 2020-04-09 16:07:31 +02:00
patrick 8bf9d4bd45 Fix implication formatting 2020-04-09 16:07:31 +02:00
patrick f82a20e5f1 Work in progress 2020-04-09 16:07:31 +02:00
patrick 5c51018ab1 Add unit test for function declaration formatting 2020-04-09 16:07:30 +02:00
patrick 23e1854346 Test term formatting 2020-04-09 16:07:30 +02:00
patrick a3da369346 Split formatting functionality into two files 2020-04-09 16:07:30 +02:00
patrick caf957deed Fix implication parser and output 2020-04-09 16:07:30 +02:00
patrick 1ece0e89ef Add note 2020-04-09 16:07:30 +02:00
patrick 0fdec430af Parentheses for stronger checks 2020-04-09 16:07:30 +02:00
patrick 5ea0a96ec4 Test disjunction parser 2020-04-09 16:07:30 +02:00
patrick 17d8dbd8ba Test conjunction parser 2020-04-09 16:07:30 +02:00
patrick 834e59207f Add note 2020-04-09 16:07:30 +02:00
patrick 257e02f285 Minor refactoring 2020-04-09 16:07:30 +02:00
patrick 2e3707e0af Check that names don’t start with special characters 2020-04-09 16:07:30 +02:00
patrick d0263dd1c4 Add missing word boundary character 2020-04-09 16:07:30 +02:00
patrick a7dd4d2fe9 Disallow reserved keywords as names 2020-04-09 16:07:29 +02:00
patrick c127bc5eea Address clippy warning 2020-04-09 16:07:29 +02:00
patrick cb616eba87 Refactor term parser tests 2020-04-09 16:07:29 +02:00
patrick 95677bae34 Fix negation parser 2020-04-09 16:07:29 +02:00
patrick 3414e8075c Address warnings 2020-04-09 16:07:29 +02:00
patrick 675063e1b8 Move string parser to separate module 2020-04-09 16:07:29 +02:00
patrick 7d78a504b1 Move special integer parser to separate module 2020-04-09 16:07:29 +02:00
patrick 6f86cd40d7 Move integer parser to separate module 2020-04-09 16:07:29 +02:00
patrick 29ea4578e4 Move boolean parser to separate module 2020-04-09 16:07:29 +02:00
patrick a1bbae9201 Finish implementing formula parsing 2020-04-09 16:07:29 +02:00
patrick 1c00e5be16 Continue parsing formulas 2020-04-09 16:07:29 +02:00
patrick 1b89d8900e Start parsing formulas 2020-04-09 16:07:29 +02:00
patrick af1ec8a606 Fix term parsing and finish tests 2020-04-09 16:07:29 +02:00
patrick 2907d10148 Make parse feature the default 2020-04-09 16:07:28 +02:00
patrick 19e70a90c5 Test associativity of multiplication 2020-04-09 16:07:28 +02:00
patrick 385c878597 Add term parsing test 2020-04-09 16:07:28 +02:00
patrick 5b98e8a29c Finish implementing term parsing 2020-04-09 16:07:28 +02:00
patrick 3530364ea8 Implement variable parsing 2020-04-09 16:07:28 +02:00
patrick deae102405 Require word boundaries around names 2020-04-09 16:07:28 +02:00
patrick 0fc8506164 Implement booleans 2020-04-09 16:07:28 +02:00
patrick e6a5c20d42 Add pipe character to allowed word boundaries 2020-04-09 16:07:28 +02:00
patrick d5cd179a2d Implement strings 2020-04-09 16:07:28 +02:00
patrick 5ec9331b4c Implement word boundaries 2020-04-09 16:07:28 +02:00
patrick 896af02120 Start parsing terms 2020-04-09 16:07:28 +02:00
patrick 0c057211ed Implement name parsing 2020-04-09 16:07:28 +02:00
patrick 91918cf645 Start reimplementing parser 2020-04-09 16:07:25 +02:00
patrick fd6ba4a005 Test crate with GitHub Actions 
This adds a GitHub Actions workflow to test this crate with the Rust
stable, beta, and nightly toolchains.
 2020-04-09 15:34:49 +02:00
patrick 153f77621e Fix precedence of absolute value operation 
As the absolute value operation has its own type of parentheses, it
never needs to take precedence over other terms in order to be displayed
correctly. To avoid extraneous parentheses around absolute value
operations, set its precedence level to 0.
 2020-03-30 06:42:54 +02:00
patrick 551c35ed75 Fix formatting of binary operations 
The precedence rules of binary operations are a bit trickier than
expected. The fact that a parent and a child term have the same
precedence level doesn’t automatically mean that parentheses can be
omitted. This is the case, for example, with

    a - (b + c)

While addition and subtraction have the same precedence level, the
parenthesis cannot be omitted. In general, this happens on the right-
hand side of the subtraction, division, and modulo operators if the
right-hand side has the same precedence level.

This patch fixes the output of binary operations accordingly.
 2020-03-30 06:37:21 +02:00
patrick 549f127729 Derive simple enums from basic traits 
This adds derive statements from Copy, Clone, PartialEq, and Eq to the
operator enums as well as SpecialInteger.
 2020-03-30 06:37:21 +02:00
patrick a304ec9a75 Fix output of Booleans in formulas 
Booleans are supposed to be formatted without a leading hash sign in
both terms and formulas. By mistake, the formula formatter added leading
hash signs though.
 2020-03-30 06:37:21 +02:00
patrick a82b4080c8 Fix function formatting 
By mistake, a function’s name was printed two consecutive times if the
function had more than one argument.
 2020-03-30 06:37:21 +02:00
patrick 90f7be2f33 Minor refactoring for clarity 2020-03-30 06:37:21 +02:00
patrick a127a053b2 Support formatting special integers separately 
This adds Debug and Display trait implementations for the SpecialInteger
enum to make it possible to format its values without having to wrap it
in a Term variant.
 2020-03-30 06:37:21 +02:00
patrick 14abd73110 Remove unneeded lifetime specifiers 2020-03-30 05:19:01 +02:00
patrick 3a5788bd24 Remove redundant release badge 
Provided that the latest version of this crate is always published on
crates.io and tagged as a release on GitHub.com, the crates.io and the
GitHub.com release badges will always show the same version.
Consequently, remove the GitHub.com release badge to avoid redundancy.
 2020-02-25 15:27:24 +01:00
patrick a446aed011 Initial commit 
This provides an abstract syntax tree for first-order logic with integer
arithmetics. Initially, the following types of formulas are supported:

- Booleans values (true and false)
- predicates
- negated formulas
- comparisons of terms (<, ≤, >, ≥, =, ≠)
- implications and biconditionals
- conjunctions and disjunctions of formulas
- existentially and universally quantified formulas

In addition, these types of terms are provided:

- Boolean values (true and false)
- integers
- strings
- special integers (infimum and supremum)
- symbolic functions
- variables
- binary operations (addition, subtraction, multiplication, division,
  modulo, exponentiation)
- unary operations (absolute value, numeric negation)
 2020-02-05 03:23:11 +01:00