FreeCAD

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# -*- coding: utf8 -*-
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#***************************************************************************
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#*   Copyright (c) 2012 Keith Sloan <keith@sloan-home.co.uk>               *
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#*                                                                         *
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#*   This program is free software; you can redistribute it and/or modify  *
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#*   it under the terms of the GNU Lesser General Public License (LGPL)    *
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#*   as published by the Free Software Foundation; either version 2 of     *
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#*   the License, or (at your option) any later version.                   *
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#*   for detail see the LICENCE text file.                                 *
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#*                                                                         *
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#*   This program is distributed in the hope that it will be useful,       *
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#*   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
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#*   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
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#*   GNU Library General Public License for more details.                  *
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#*                                                                         *
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#*   You should have received a copy of the GNU Library General Public     *
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#*   License along with this program; if not, write to the Free Software   *
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#*   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  *
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#*   USA                                                                   *
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#*                                                                         *
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#***************************************************************************
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__title__ = "FreeCAD OpenSCAD Workbench - CSG importer Version 0.5c"
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__author__ = "Keith Sloan <keith@sloan-home.co.uk>"
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__url__ = ["http://www.sloan-home.co.uk/ImportCSG"]
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# Reserved words
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reserved = (
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    'group',
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    'sphere',
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    'cylinder',
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    'cube',
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    'multmatrix',
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    'intersection',
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    'difference',
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    'union',
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    'rotate_extrude',
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    'linear_extrude',
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    'true',
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    'false',
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    'circle',
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    'square',
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    'text',
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    'polygon',
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    'paths',
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    'points',
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    'undef',
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    'polyhedron',
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    'triangles',
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    'faces',
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    'render',
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    'surface',
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    'subdiv',
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    'glide',
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    'hull',
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    'minkowski',
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    'projection',
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    'import',
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    'color',
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    'offset',
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    'resize',
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    )
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# List of token names.   This is always required
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tokens = reserved + (
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   'WORD',
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   'NUMBER',
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   'LPAREN',
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   'RPAREN',
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   'OBRACE',
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   'EBRACE',
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   'OSQUARE',
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   'ESQUARE',
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   'COMMA',
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   'SEMICOL',
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   'EQ',
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   'STRING',
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   'ID',
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   'DOT',
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   'MODIFIERBACK',
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   'MODIFIERDEBUG',
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   'MODIFIERROOT',
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   'MODIFIERDISABLE'
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)
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# Regular expression rules for simple tokens
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t_WORD    = r'[$]?[a-zA-Z_]+[0-9]*'
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t_NUMBER  = r'[-]?[0-9]*[\.]*[0-9]+([eE][+-]?[0-9]+)*'
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t_LPAREN  = r'\('
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t_RPAREN  = r'\)'
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t_OBRACE  = r'{'
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t_EBRACE  = r'\}'
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t_OSQUARE = r'\['
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t_ESQUARE = r'\]'
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t_COMMA   = r','
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t_SEMICOL = r';'
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t_EQ      = r'='
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t_DOT     = r'\.'
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t_STRING  = r'"[^"]*"'
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#t_STRING  = r'["]+[a-zA-Z.]+["]+'
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t_MODIFIERBACK    = r'%'
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t_MODIFIERDEBUG   = r'\#'
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t_MODIFIERROOT    = r'!'
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t_MODIFIERDISABLE = r'\*'
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# Deal with Reserved words
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reserved_map = { }
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for r in reserved:
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    reserved_map[r.lower()] = r
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# Deal with Comments
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def t_comment1(t):
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    r'//[^\r\n]*((\r\n)|<<EOF>>)'
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    pass
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def t_comment2(t):
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    r'//[^\n]*((\n)|<<EOF>>)'
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    pass
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def t_ID(t):
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    r'[$]?[a-zA-Z_]+[0-9]*'
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    t.type = reserved_map.get(t.value, "ID")
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    return t
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# Define a rule so we can track line numbers
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def t_newline(t):
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    r'\n+'
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    t.lexer.lineno += len(t.value)
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# A string containing ignored characters (spaces and tabs)
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t_ignore = " \t\r"
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# Error handling rule
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def t_error(t):
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    print("Illegal character '%s'" % t.value[0])
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    t.lexer.skip(1)
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