mirror of
https://github.com/sourcegit-scm/sourcegit.git
synced 2024-12-25 21:07:20 -08:00
aikawayataro
GitHub
parent
73687689ce
commit
8021cd8566
2 changed files with 413 additions and 56 deletions
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@ -1,7 +1,4 @@
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using System;
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using System.Collections.Generic;
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using System.Text;
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using System.Text.RegularExpressions;
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using System.Collections.Generic;
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using CommunityToolkit.Mvvm.ComponentModel;
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@ -9,9 +6,6 @@ namespace SourceGit.Models
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{
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public partial class CommitTemplate : ObservableObject
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{
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[GeneratedRegex(@"\$\{files(\:\d+)?\}")]
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private static partial Regex REG_COMMIT_TEMPLATE_FILES();
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public string Name
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{
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get => _name;
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@ -26,55 +20,8 @@ namespace SourceGit.Models
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public string Apply(Branch branch, List<Change> changes)
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{
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var content = _content
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.Replace("${files_num}", $"{changes.Count}")
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.Replace("${branch_name}", branch.Name);
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var matches = REG_COMMIT_TEMPLATE_FILES().Matches(content);
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if (matches.Count == 0)
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return content;
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var builder = new StringBuilder();
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var last = 0;
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for (int i = 0; i < matches.Count; i++)
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{
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var match = matches[i];
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if (!match.Success)
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continue;
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var start = match.Index;
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if (start != last)
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builder.Append(content.Substring(last, start - last));
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var countStr = match.Groups[1].Value;
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var paths = new List<string>();
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var more = string.Empty;
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if (countStr is { Length: <= 1 })
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{
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foreach (var c in changes)
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paths.Add(c.Path);
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}
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else
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{
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var count = Math.Min(int.Parse(countStr.Substring(1)), changes.Count);
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for (int j = 0; j < count; j++)
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paths.Add(changes[j].Path);
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if (count < changes.Count)
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more = $" and {changes.Count - count} other files";
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}
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builder.Append(string.Join(", ", paths));
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if (!string.IsNullOrEmpty(more))
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builder.Append(more);
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last = start + match.Length;
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}
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if (last != content.Length - 1)
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builder.Append(content.Substring(last));
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return builder.ToString();
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var te = new TemplateEngine();
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return te.Eval(_content, branch, changes);
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}
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private string _name = string.Empty;
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410
src/Models/TemplateEngine.cs
Normal file
410
src/Models/TemplateEngine.cs
Normal file
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@ -0,0 +1,410 @@
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using System;
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using System.Collections.Generic;
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using System.Text;
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using System.Text.RegularExpressions;
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namespace SourceGit.Models
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{
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public class TemplateEngine
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{
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private class Context(Branch branch, IReadOnlyList<Change> changes)
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{
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public Branch branch = branch;
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public IReadOnlyList<Change> changes = changes;
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}
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private class Text(string text)
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{
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public string text = text;
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}
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private class Variable(string name)
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{
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public string name = name;
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}
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private class SlicedVariable(string name, int count)
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{
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public string name = name;
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public int count = count;
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}
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private class RegexVariable(string name, Regex regex, string replacement)
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{
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public string name = name;
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public Regex regex = regex;
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public string replacement = replacement;
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}
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private const char ESCAPE = '\\';
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private const char VARIABLE_ANCHOR = '$';
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private const char VARIABLE_START = '{';
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private const char VARIABLE_END = '}';
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private const char VARIABLE_SLICE = ':';
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private const char VARIABLE_REGEX = '/';
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private const char NEWLINE = '\n';
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private const RegexOptions REGEX_OPTIONS = RegexOptions.Singleline | RegexOptions.IgnoreCase;
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public string Eval(string text, Branch branch, IReadOnlyList<Change> changes)
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{
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Reset();
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_chars = text.ToCharArray();
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Parse();
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var context = new Context(branch, changes);
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var sb = new StringBuilder();
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sb.EnsureCapacity(text.Length);
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foreach (var token in _tokens)
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{
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switch (token)
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{
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case Text text_token:
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sb.Append(text_token.text);
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break;
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case Variable var_token:
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sb.Append(EvalVariable(context, var_token));
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break;
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case SlicedVariable sliced_var:
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sb.Append(EvalVariable(context, sliced_var));
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break;
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case RegexVariable regex_var:
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sb.Append(EvalVariable(context, regex_var));
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break;
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}
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}
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return sb.ToString();
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}
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private void Reset()
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{
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_pos = 0;
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_chars = [];
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_tokens.Clear();
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}
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private char? Next()
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{
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var c = Peek();
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if (c is not null)
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{
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_pos++;
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}
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return c;
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}
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private char? Peek()
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{
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return (_pos >= _chars.Length) ? null : _chars[_pos];
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}
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private int? Integer()
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{
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var start = _pos;
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while (Peek() is char c && c >= '0' && c <= '9')
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{
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_pos++;
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}
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if (start >= _pos)
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return null;
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var chars = new ReadOnlySpan<char>(_chars, start, _pos - start);
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return int.Parse(chars);
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}
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private void Parse()
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{
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// text token start
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var tok = _pos;
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bool esc = false;
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while (Next() is char c)
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{
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if (esc)
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{
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esc = false;
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continue;
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}
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switch (c)
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{
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case ESCAPE:
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// allow to escape only \ and $
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if (Peek() is char nc && (nc == ESCAPE || nc == VARIABLE_ANCHOR))
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{
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esc = true;
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FlushText(tok, _pos - 1);
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tok = _pos;
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}
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break;
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case VARIABLE_ANCHOR:
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// backup the position
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var bak = _pos;
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var variable = TryParseVariable();
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if (variable is null)
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{
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// no variable found, rollback
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_pos = bak;
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}
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else
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{
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// variable found, flush a text token
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FlushText(tok, bak - 1);
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_tokens.Add(variable);
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tok = _pos;
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}
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break;
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}
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}
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// flush text token
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FlushText(tok, _pos);
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}
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private void FlushText(int start, int end)
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{
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int len = end - start;
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if (len <= 0)
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return;
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var text = new string(_chars, start, len);
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_tokens.Add(new Text(text));
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}
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private object TryParseVariable()
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{
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if (Next() != VARIABLE_START)
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return null;
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int name_start = _pos;
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while (Next() is char c)
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{
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// name character, continue advancing
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if (IsNameChar(c))
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continue;
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var name_end = _pos - 1;
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// not a name character but name is empty, cancel
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if (name_start >= name_end)
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return null;
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var name = new string(_chars, name_start, name_end - name_start);
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return c switch
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{
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// variable
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VARIABLE_END => new Variable(name),
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// sliced variable
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VARIABLE_SLICE => TryParseSlicedVariable(name),
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// regex variable
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VARIABLE_REGEX => TryParseRegexVariable(name),
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_ => null,
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};
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}
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return null;
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}
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private object TryParseSlicedVariable(string name)
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{
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int? n = Integer();
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if (n is null)
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return null;
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if (Next() != VARIABLE_END)
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return null;
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return new SlicedVariable(name, (int)n);
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}
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private object TryParseRegexVariable(string name)
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{
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var regex = ParseRegex();
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if (regex == null)
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return null;
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var replacement = ParseReplacement();
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if (replacement == null)
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return null;
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return new RegexVariable(name, regex, replacement);
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}
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private Regex ParseRegex()
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{
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var sb = new StringBuilder();
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var tok = _pos;
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var esc = false;
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while (Next() is char c)
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{
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if (esc)
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{
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esc = false;
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continue;
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}
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switch (c)
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{
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case ESCAPE:
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// allow to escape only / as \ and { used frequently in regexes
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if (Peek() == VARIABLE_REGEX)
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{
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esc = true;
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sb.Append(_chars, tok, _pos - 1 - tok);
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tok = _pos;
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}
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break;
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case VARIABLE_REGEX:
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// goto is fine
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goto Loop_exit;
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case NEWLINE:
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// no newlines allowed
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return null;
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}
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}
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Loop_exit:
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sb.Append(_chars, tok, _pos - 1 - tok);
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try
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{
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var pattern = sb.ToString();
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if (pattern.Length == 0)
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return null;
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var regex = new Regex(pattern, REGEX_OPTIONS);
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return regex;
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}
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catch (RegexParseException)
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{
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return null;
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}
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}
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private string ParseReplacement()
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{
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var sb = new StringBuilder();
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var tok = _pos;
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var esc = false;
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while (Next() is char c)
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{
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if (esc)
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{
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esc = false;
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continue;
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}
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switch (c)
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{
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case ESCAPE:
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// allow to escape only }
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if (Peek() == VARIABLE_END)
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{
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esc = true;
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sb.Append(_chars, tok, _pos - 1 - tok);
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tok = _pos;
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}
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break;
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case VARIABLE_END:
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// goto is fine
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goto Loop_exit;
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case NEWLINE:
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// no newlines allowed
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return null;
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}
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}
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Loop_exit:
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sb.Append(_chars, tok, _pos - 1 - tok);
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var replacement = sb.ToString();
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return replacement;
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}
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private static bool IsNameChar(char c)
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{
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return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || (c >= '0' && c <= '9');
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}
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// (?) notice or log if variable is not found
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private static string EvalVariable(Context context, string name)
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{
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if (!s_variables.TryGetValue(name, out var getter))
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{
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return string.Empty;
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}
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return getter(context);
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}
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private static string EvalVariable(Context context, Variable variable)
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{
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return EvalVariable(context, variable.name);
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}
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private static string EvalVariable(Context context, SlicedVariable variable)
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{
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if (!s_slicedVariables.TryGetValue(variable.name, out var getter))
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{
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return string.Empty;
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}
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return getter(context, variable.count);
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}
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private static string EvalVariable(Context context, RegexVariable variable)
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{
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var str = EvalVariable(context, variable.name);
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if (string.IsNullOrEmpty(str))
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return str;
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return variable.regex.Replace(str, variable.replacement);
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}
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private int _pos = 0;
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private char[] _chars = [];
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private readonly List<object> _tokens = [];
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private delegate string VariableGetter(Context context);
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private static readonly IReadOnlyDictionary<string, VariableGetter> s_variables = new Dictionary<string, VariableGetter>() {
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// legacy variables
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{"branch_name", GetBranchName},
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{"files_num", GetFilesCount},
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{"files", GetFiles},
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//
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{"BRANCH", GetBranchName},
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{"FILES_COUNT", GetFilesCount},
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{"FILES", GetFiles},
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};
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private static string GetBranchName(Context context)
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{
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return context.branch.Name;
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}
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private static string GetFilesCount(Context context)
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{
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return context.changes.Count.ToString();
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}
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private static string GetFiles(Context context)
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{
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var paths = new List<string>();
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foreach (var c in context.changes)
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paths.Add(c.Path);
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return string.Join(", ", paths);
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}
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private delegate string VariableSliceGetter(Context context, int count);
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private static readonly IReadOnlyDictionary<string, VariableSliceGetter> s_slicedVariables = new Dictionary<string, VariableSliceGetter>() {
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// legacy variables
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{"files", GetFilesSliced},
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//
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{"FILES", GetFilesSliced},
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};
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private static string GetFilesSliced(Context context, int count)
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{
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var sb = new StringBuilder();
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var paths = new List<string>();
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var max = Math.Min(count, context.changes.Count);
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for (int i = 0; i < max; i++)
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paths.Add(context.changes[i].Path);
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sb.AppendJoin(", ", paths);
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if (max < context.changes.Count)
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sb.AppendFormat(" and {0} other files", context.changes.Count - max);
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return sb.ToString();
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}
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}
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}
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Reference in a new issue