UniCC LALR(1) Parser Generator
|Download||v1.5 (source code) (more)
v1.5 (Windows 32-Bit setup)
UniCC (UNIversal Compiler-Compiler) compiles an augmented grammar definition into a program source code that parses the described grammar. Because UniCC is intended to be target-language independent, it can be configured via template definition files to emit parsers in almost any programming language.
This is the full definition for a four-function arithmetic syntax including their integer calculation semantics (in C).
#!language "C"; // <- target language! #whitespaces ' \t'; #lexeme int; #default action [* @@ = @1 *]; #left '+' '-'; #left '*' '/'; //Defining the grammar calc$ -> expr [* printf( "= %d\n", @expr ) *] ; expr -> expr '+' expr [* @@ = @1 + @3 *] | expr '-' expr [* @@ = @1 - @3 *] | expr '*' expr [* @@ = @1 * @3 *] | expr '/' expr [* @@ = @1 / @3 *] | '(' expr ')' [* @@ = @2 *] | int ; int -> '0-9' [* @@ = @1 - '0' *] | int '0-9' [* @@ = @int * 10 + @2 - '0' *] ;
To build and run this example, do
$ unicc expr.par $ cc -o expr expr.c $ ./expr -sl 3*10-(2*4)+1 = 23
UniCC provides the following features and tools:
- Grammars are expressed in a powerful Backus-Naur-style meta language
- Build-in scanner generator with full Unicode support
- Grammar prototyping features, virtual productions and anonymous nonterminals
- Abstract syntax tree notation features
- Semantically determined symbols
- Standard LALR(1) conflict resolution
- Platform-independent (console-based)
The UniCC User Manual is the ultimative guide and reference for the UniCC parser generator.
It covers a general feature introducion in to UniCC, a beginner's tutorial guiding into the topic 'parsing' in general and how to implement parsers with UniCC, a UniCC compiler and language reference guide and a user's reference relating to the Standard C Parser Template. As an state-of-the-art example, the compiler for a simple programming language called XPL is developed alongside the howto guide.
The manual will be continously be updated and extended with more or detailed information and chapters. Hopefully it answers all of questions coming up when UniCC shall become the workhorse of your upcoming compiler project. If not, don't avoid to drop a mail, to get individual support and help with the UniCC Parser Generator and its subsequent modules.
The UniCC LALR(1) Parser Generator can be used, modified and distributed under the BSD open source license.