58 lines
2.2 KiB
C#
58 lines
2.2 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using CodeStatisticsCore.Handling.Utils;
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using LanguageJava.Utils;
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namespace LanguageJava.Handling{
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public class JavaCodeBlockParser : CodeParser{
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private static readonly string[] ParsedKeywords = {
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"if", "else", "for", "while", "do", "switch", "case", "default", "try", "catch", "finally", "return", "break", "continue"
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};
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private static readonly HashSet<char> ParsedKeywordStarts = new HashSet<char>(ParsedKeywords.Select(str => str[0]).Distinct().ToList());
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private static readonly Predicate<char> IsKeywordStart = ParsedKeywordStarts.Contains;
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private int prevCursor;
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public JavaCodeBlockParser(string code) : base(code){
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IsWhiteSpace = JavaCharacters.IsWhiteSpace;
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IsIdentifierStart = JavaCharacters.IsIdentifierStart;
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IsIdentifierPart = JavaCharacters.IsIdentifierPart;
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IsValidIdentifier = str => str.Length > 0;
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}
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public override CodeParser Clone(string newCode = null){
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return new JavaCodeBlockParser(newCode ?? string.Empty);
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}
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/// <summary>
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/// Goes back to the last cursor position before calling <see cref="ReadNextKeywordSkip"/>. Returns itself.
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/// </summary>
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public JavaCodeBlockParser RevertKeywordSkip(){
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cursor = prevCursor;
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return this;
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}
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/// <summary>
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/// Skips until it hits a valid keyword surrounded by non-identifier characters. The cursor is placed right after the keyword.
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/// If no keyword is found, the cursor does not move and the method returns <see cref="string.Empty"/>, otherwise it returns the keyword.
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/// </summary>
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public string ReadNextKeywordSkip(){
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prevCursor = cursor;
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while(!IsEOF){
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if (IsKeywordStart(Char) && (cursor == 0 || !IsIdentifierPart(code[cursor-1]))){
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string identifier = ReadIdentifier();
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if (identifier.Length > 0 && ParsedKeywords.Contains(identifier))return identifier;
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}
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Skip();
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}
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cursor = prevCursor;
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return string.Empty;
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}
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}
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}
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