240 lines
9.9 KiB
C#
240 lines
9.9 KiB
C#
//-----------------------------------------------------------------------
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//-----------------------------------------------------------------------
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// file="ExpSourceReader.cs"
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// Project: StgSharp
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// AuthorGroup: Nitload Space
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// Copyright (c) Nitload Space. All rights reserved.
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//
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// Permission is hereby granted, free of charge, to any person
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// obtaining a copy of this software and associated documentation
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// files (the “Software”), to deal in the Software without restriction,
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// including without limitation the rights to use, copy, modify, merge,
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// publish, distribute, sublicense, and/or sell copies of the Software,
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// and to permit persons to whom the Software is furnished to do so,
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// subject to the following conditions:
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//
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// The above copyright notice and
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// this permission notice shall be included in all copies
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// or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED “AS IS”,
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// WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
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// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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// ARISING FROM, OUT OF OR IN CONNECTION WITH
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// THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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//-----------------------------------------------------------------------
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//-----------------------------------------------------------------------
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using CommunityToolkit.HighPerformance;
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using StgSharp.Intrinsic;
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using System;
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using System.Collections.Generic;
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using System.Diagnostics.Tracing;
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using System.Linq;
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using System.Runtime.CompilerServices;
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using System.Text;
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using System.Text.RegularExpressions;
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namespace StgSharp.Script.Express
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{
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public partial class ExpSourceReader
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{
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private const int
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MultiLineEnd = 0x0029002A; // *)
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private const string Token = "token", End = "end", Rest = "rest";
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private bool _isReadingMultiLineComment;
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private int _current;
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private IScriptSourceProvider _provider;
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private string _lineCache;
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public ExpSourceReader( IScriptSourceProvider provider )
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{
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_provider = provider;
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_current = 0;
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_lineCache = string.Empty;
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_isReadingMultiLineComment = false;
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}
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public int LineNumber
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{
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get => _provider.Location;
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}
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public bool IsEmpty
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{
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get => ( ( string.IsNullOrEmpty( _lineCache ) || _current >=
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_lineCache.Length ) ) && _provider.IsEmpty;
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}
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/// <summary>
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/// <para> Read code until end of a line. Lines in multi-line comment will be ignored. Line
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/// begins with part of multi-line comment will automatically remove the comment part, but
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/// beginning with a full multi-line comment will not causing removing. </para> <para>(*Just
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/// Like The Comment Here*) Will Not Be Removed</para>
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/// </summary>
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/// <returns></returns>
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public unsafe ReadOnlySpan<char> ReadLine()
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{
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bool lineOver = string.IsNullOrEmpty( _lineCache ) || _current >=
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_lineCache.Length;
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while( lineOver || _isReadingMultiLineComment ) {
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if( lineOver ) {
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do {
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_lineCache = _provider.ReadLine();
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} while (string.IsNullOrEmpty( _lineCache ));
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_current = 0;
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}
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if( _isReadingMultiLineComment ) {
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int index;
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fixed( char* cPtr = _lineCache.AsSpan( _current ) ) {
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index = UnsafeCompute.IndexOfCharPair(
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cPtr, MultiLineEnd, _lineCache.Length );
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}
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if( index == -1 ) {
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_lineCache = string.Empty;
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} else {
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_isReadingMultiLineComment = false;
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_current += index + 2;
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}
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}
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lineOver = string.IsNullOrEmpty( _lineCache ) || _current >=
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_lineCache.Length;
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}
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return _lineCache.AsSpan().Slice( _current );
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}
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public unsafe ReadOnlySpan<char> ReadToken()
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{
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int begin, end, rest;
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readLine:
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ReadOnlySpan<char> source = ReadLine();
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char c = source[ 0 ];
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if( char.IsLetter( c ) ) {
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Match match = _nextWordTokenPattern.Match(
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_lineCache, _current );
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if( match.Success ) {
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begin = match.Groups[ Token ].Index;
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end = match.Groups[ End ].Index;
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rest = match.Groups[ Rest ].Index;
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_current = rest;
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return source.Slice( 0, end - begin );
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} else {
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throw new ExpInvalidTokenException( _current );
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}
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} else if( char.IsPunctuation( c ) || char.IsSymbol( c ) ) {
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switch( c ) {
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case '"':
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Match match = _nextStringLiteralPattern.Match(
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_lineCache, _current );
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if( match.Success ) {
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begin = match.Groups[ "token" ].Index;
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end = match.Groups[ "end" ].Index;
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rest = match.Groups[ "rest" ].Index;
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_current = rest;
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return source[ ..( end - begin ) ];
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} else {
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throw new ExpInvalidCharException( '\"' );
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}
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case '(':
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char cNext = source[ 1 ];
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if( cNext == '*' ) {
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_isReadingMultiLineComment = true;
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_current += 2;
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goto readLine;
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} else {
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return source[ ..1 ];
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}
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case '-':
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// 1. -number
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// 2. -- comment
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// 3. - number type param
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cNext = source[ 1 ];
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if( char.IsNumber( cNext ) ) {
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match = _nextNumberLiteralPattern.Match(
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_lineCache, _current );
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if( match.Success ) {
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begin = match.Groups[ Token ].Index;
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end = match.Groups[ End ].Index;
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rest = match.Groups[ Rest ].Index;
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_current = rest;
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return source[ ..( end - begin ) ];
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} else {
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throw new ExpInvalidTokenException( _current );
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}
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} else if( cNext == '-' ) {
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_lineCache = string.Empty;
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_current = 0;
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goto readLine;
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} else {
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_current++;
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return source[ ..1 ];
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}
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case ')' or '[' or ']' or '{' or '}' or ':' or ';' or
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'+' or '/' or '\\' or '*' or '.' or ',':
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_current++;
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return source[ ..1 ];
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default:
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throw new ExpInvalidCharException( c );
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}
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} else if( char.IsNumber( c ) ) {
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Match match = _nextNumberLiteralPattern.Match(
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_lineCache, _current );
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if( match.Success ) {
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begin = match.Groups[ Token ].Index;
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end = match.Groups[ End ].Index;
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rest = match.Groups[ Rest ].Index;
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_current = rest;
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return source[ ..( end - begin ) ];
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} else {
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throw new ExpInvalidTokenException( _current );
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}
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} else if( char.IsWhiteSpace( c ) ) {
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Match match = _skipBlankPattern.Match( _lineCache, _current );
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if( match.Success ) {
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rest = match.Groups[ Rest ].Index;
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_current = rest;
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goto readLine;
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} else {
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throw new ExpInvalidTokenException( _current );
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}
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} else {
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throw new ExpInvalidCharException( c );
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}
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}
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[GeneratedRegex(
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@"(?<token>[a-zA-Z][a-zA-Z0-9_]*)(?<end>\s*?)(?<rest>\S|$)",
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RegexOptions.Singleline )]
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private static partial Regex GetNextWordTokenPattern();
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[GeneratedRegex(
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@"(?<token>-?\s*?[0-9]+(?:\.[0-9]*)?)(?<end>\s*?)(?<rest>\S|$)",
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RegexOptions.Singleline )]
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private static partial Regex GetNumberLiteralPattern();
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[GeneratedRegex( @"(?:\s+?)(?<rest>\S|$)", RegexOptions.Singleline )]
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private static partial Regex GetSkipBlankPattern();
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[GeneratedRegex(
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@"(?<token>"")(?:.*?[^""\\](\\\\)*)?(?<end>"")\s*?(?<next>\S|$)",
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RegexOptions.Singleline )]
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private static partial Regex GetStringLiteralPattern();
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private Regex _nextWordTokenPattern = GetNextWordTokenPattern(),
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_nextStringLiteralPattern = GetStringLiteralPattern(),
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_nextNumberLiteralPattern = GetNumberLiteralPattern(),
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_skipBlankPattern = GetSkipBlankPattern();
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}
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}
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