Ejemplo n.º 1
0
        private TexFormula Parse(string value, ref int position, bool allowClosingDelimiter, string textStyle)
        {
            var formula = new TexFormula()
            {
                TextStyle = textStyle
            };
            var closedDelimiter = false;

            while (position < value.Length && !(allowClosingDelimiter && closedDelimiter))
            {
                char ch = value[position];
                if (IsWhiteSpace(ch))
                {
                    position++;
                }
                else if (ch == escapeChar)
                {
                    ProcessEscapeSequence(formula, value, ref position, allowClosingDelimiter, ref closedDelimiter);
                }
                else if (ch == leftGroupChar)
                {
                    var groupValue     = ReadGroup(formula, value, ref position, leftGroupChar, rightGroupChar);
                    var parsedGroup    = Parse(groupValue, textStyle);
                    var innerGroupAtom = parsedGroup.RootAtom ?? new RowAtom();
                    var groupAtom      = new TypedAtom(innerGroupAtom, TexAtomType.Ordinary, TexAtomType.Ordinary);
                    formula.Add(AttachScripts(formula, value, ref position, groupAtom));
                }
                else if (ch == rightGroupChar)
                {
                    throw new TexParseException("Found a closing '" + rightGroupChar
                                                + "' without an opening '" + leftGroupChar + "'!");
                }
                else if (ch == superScriptChar || ch == subScriptChar || ch == primeChar)
                {
                    if (position == 0)
                    {
                        throw new TexParseException("Every script needs a base: \""
                                                    + superScriptChar + "\", \"" + subScriptChar + "\" and \""
                                                    + primeChar + "\" can't be the first character!");
                    }
                    else
                    {
                        throw new TexParseException("Double scripts found! Try using more braces.");
                    }
                }
                else
                {
                    var scriptsAtom = AttachScripts(formula, value, ref position,
                                                    ConvertCharacter(formula, value, ref position, ch));
                    formula.Add(scriptsAtom);
                }
            }

            return(formula);
        }
Ejemplo n.º 2
0
        private TexFormula Parse(
            SourceSpan value,
            ref int position,
            bool allowClosingDelimiter,
            string textStyle,
            ICommandEnvironment environment)
        {
            var formula = new TexFormula {
                Source = value, TextStyle = textStyle
            };
            var closedDelimiter = false;
            var skipWhiteSpace  = ShouldSkipWhiteSpace(textStyle);
            var initialPosition = position;

            while (position < value.Length && !(allowClosingDelimiter && closedDelimiter))
            {
                char ch     = value[position];
                var  source = value.Segment(position, 1);
                if (IsWhiteSpace(ch))
                {
                    if (!skipWhiteSpace)
                    {
                        formula.Add(new SpaceAtom(source), source);
                    }

                    position++;
                }
                else if (ch == escapeChar)
                {
                    ProcessEscapeSequence(
                        formula,
                        value,
                        ref position,
                        allowClosingDelimiter,
                        ref closedDelimiter,
                        environment);
                }
                else if (ch == leftGroupChar)
                {
                    var groupValue     = ReadElement(value, ref position);
                    var parsedGroup    = Parse(groupValue, textStyle, environment.CreateChildEnvironment());
                    var innerGroupAtom = parsedGroup.RootAtom ?? new RowAtom(groupValue);
                    var groupAtom      = new TypedAtom(
                        innerGroupAtom.Source,
                        innerGroupAtom,
                        TexAtomType.Ordinary,
                        TexAtomType.Ordinary);
                    var scriptsAtom = this.AttachScripts(formula, value, ref position, groupAtom, true, environment);
                    formula.Add(scriptsAtom, value.Segment(initialPosition, position - initialPosition));
                }
                else if (ch == rightGroupChar)
                {
                    throw new TexParseException("Found a closing '" + rightGroupChar
                                                + "' without an opening '" + leftGroupChar + "'!");
                }
                else if (ch == superScriptChar || ch == subScriptChar || ch == primeChar)
                {
                    if (position == 0)
                    {
                        throw new TexParseException("Every script needs a base: \""
                                                    + superScriptChar + "\", \"" + subScriptChar + "\" and \""
                                                    + primeChar + "\" can't be the first character!");
                    }
                    else
                    {
                        throw new TexParseException("Double scripts found! Try using more braces.");
                    }
                }
                else
                {
                    var character = ConvertCharacter(formula, ref position, source, environment);
                    if (character != null)
                    {
                        var scriptsAtom = AttachScripts(
                            formula,
                            value,
                            ref position,
                            character,
                            skipWhiteSpace,
                            environment);
                        formula.Add(scriptsAtom, value.Segment(initialPosition, position));
                    }
                }
            }

            return(formula);
        }