kicad/common/libeval_compiler/grammar.lemon

/*
    This file is part of libeval, a simple math expression evaluator

    Copyright (C) 2017 Michael Geselbracht, mgeselbracht3@gmail.com
    Copyright (C) 2019-2020 KiCad Developers, see AUTHORS.txt for contributors.

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.
*/

%token_type { LIBEVAL::T_TOKEN }
%extra_argument { LIBEVAL::COMPILER* pEval }

%type nt {LIBEVAL::TREE_NODE*}

%nonassoc G_IDENTIFIER G_ASSIGN G_SEMCOL.
%left G_BOOL_AND.
%left G_BOOL_OR.
%left G_BOOL_XOR.
%nonassoc G_LESS_THAN G_GREATER_THAN G_LESS_EQUAL_THAN G_GREATER_EQUAL_THAN G_EQUAL G_NOT_EQUAL.
%right G_BOOL_NOT.
%left G_PLUS G_MINUS.
%left G_DIVIDE G_MULT.
%nonassoc G_STRUCT_REF.
%nonassoc G_UNIT.

%include {
#include <assert.h>
#include <libeval_compiler/libeval_compiler.h>
}

%syntax_error {
  pEval->parseError("Syntax error");
}

%parse_accept {
  pEval->parseOk();
}

main ::= in.

/* Allow multiple statements in input string: x=1; y=2 */
in ::= stmt.
in ::= in stmt.

/* A statement can be empty, an expr or an expr followed by ';' */
stmt ::= G_ENDS.
stmt ::= nt(A) G_ENDS.                          { pEval->setRoot(A); }

nt(A) ::= G_VALUE(B).
{
    A = newNode( pEval, TR_NUMBER, B.value );
}

nt(A) ::= G_VALUE(B) G_UNIT(C).
{
    A = newNode( pEval, TR_NUMBER, B.value );
    A->leaf[0] = newNode( pEval, TR_UNIT, C.value );
}

nt(A) ::= G_STRING(B).
{
    A = newNode( pEval, TR_STRING, B.value );
}

nt(A) ::= G_IDENTIFIER(B).
{
    A = newNode( pEval, TR_IDENTIFIER, B.value );
}

nt(A) ::= nt(B) G_LESS_THAN nt(C).
{
    A = newNode( pEval, TR_OP_LESS );
    A->leaf[0] = B;
    A->leaf[1] = C;
}

nt(A) ::= nt(B) G_GREATER_THAN nt(C).
{
    A = newNode( pEval, TR_OP_GREATER );
    A->leaf[0] = B;
    A->leaf[1] = C;
}

nt(A) ::= nt(B) G_LESS_EQUAL_THAN nt(C).
{
    A = newNode( pEval, TR_OP_LESS_EQUAL );
    A->leaf[0] = B;
    A->leaf[1] = C;
}

nt(A) ::= nt(B) G_GREATER_EQUAL_THAN nt(C).
{
    A = newNode( pEval, TR_OP_GREATER_EQUAL );
    A->leaf[0] = B;
    A->leaf[1] = C;
}

nt(A) ::= nt(B) G_NOT_EQUAL nt(C).
{
    A = newNode( pEval, TR_OP_NOT_EQUAL );
    A->leaf[0] = B;
    A->leaf[1] = C;
}


nt(A) ::= nt(B) G_BOOL_AND nt(C).
{
    A = newNode( pEval, TR_OP_BOOL_AND );
    A->leaf[0] = B;
    A->leaf[1] = C;
}

nt(A) ::= nt(B) G_BOOL_OR nt(C).
{
    A = newNode( pEval, TR_OP_BOOL_OR );
    A->leaf[0] = B;
    A->leaf[1] = C;
}

nt(A) ::= nt(B) G_PLUS nt(C).
{
    A = newNode( pEval, TR_OP_ADD );
    A->leaf[0] = B;
    A->leaf[1] = C;
}

nt(A) ::= G_PLUS nt(B).
{
    A = newNode( pEval, B->op, B->value );
    A->leaf[0] = B->leaf[0];
    A->leaf[1] = B->leaf[1];
}


nt(A) ::= G_MINUS nt(B).
{
    A = newNode( pEval, TR_OP_SUB );
    A->leaf[0] = newNode( pEval, TR_NUMBER );
    A->leaf[1] = B;
}


nt(A) ::= nt(B) G_MINUS nt(C).
{
    A = newNode( pEval, TR_OP_SUB );
    A->leaf[0] = B;
    A->leaf[1] = C;
}

nt(A) ::= nt(B) G_MULT nt(C).
{
    A = newNode( pEval, TR_OP_MUL );
    A->leaf[0] = B;
    A->leaf[1] = C;
}

nt(A) ::= nt(B) G_DIVIDE nt(C).
{
    A = newNode( pEval, TR_OP_DIV );
    A->leaf[0] = B;
    A->leaf[1] = C;
}

nt(A) ::= nt(B) G_EQUAL nt(C).
{
    A = newNode( pEval, TR_OP_EQUAL );
    A->leaf[0] = B;
    A->leaf[1] = C;
}

nt(A) ::= nt(B) G_STRUCT_REF nt(C).
{
    A = newNode( pEval, TR_STRUCT_REF );
    A->leaf[0] = B;
    A->leaf[1] = C;
}

nt(A) ::= G_PARENL nt(B) G_PARENR.
{
    A = newNode( pEval, B->op, B->value );
    A->leaf[0] = B->leaf[0];
    A->leaf[1] = B->leaf[1];
}

nt(A) ::= G_IDENTIFIER(F) G_PARENL nt(B) G_PARENR.
{
    A = newNode( pEval, TR_OP_FUNC_CALL );
    A->leaf[0] = newNode( pEval, TR_IDENTIFIER, F.value);
    A->leaf[1] = B;
}