GrammarProject

Universal context free grammar parser

Grammar examples

Basic math grammar

#import <standard>

expression(default):
    <group><expression_tail>

expression_tail(optional):
    +<expression>
    -<expression>

group:
    <factor><group_tail>

group_tail(optional):
    *<group>
    /<group>

factor:
    (<expression>)
    <double>
    -<factor>

Basic math grammar using extended (.eccfg file)

cat expression{
    <group><expression_tail>
}

cat expression_tail(optional){
    <outer_operator><expression>
}

token outer_operator{
    "\+|-"
}

cat group{
    <factor><group_tail>
}

cat group_tail(optional){
    <inner_operator><group>
}

token inner_operator{
    "\\|*"
}

cat number{
    \regex("\d+(.\d*)?")\
}

cat factor{
    (<expression>)
    <number>
    -<factor>
}