97 lines
3.2 KiB
C#
97 lines
3.2 KiB
C#
using System;
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using System.IO;
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using System.Linq;
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using System.Text.RegularExpressions;
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namespace ExportDXF.Services
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{
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public static class FilenameTemplateParser
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{
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private static readonly Regex PlaceholderPattern = new Regex(
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@"\{(?<name>\w+)(?::(?<pad>\d+))?\}",
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RegexOptions.Compiled);
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/// <summary>
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/// Evaluates a template string for a given item.
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/// e.g. "4321 A01 PT{item_no:2}" with item_no=3 → "4321 A01 PT03"
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/// </summary>
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public static string Evaluate(string template, Item item)
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{
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return PlaceholderPattern.Replace(template, match =>
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{
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var name = match.Groups["name"].Value.ToLowerInvariant();
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var padStr = match.Groups["pad"].Value;
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int pad = string.IsNullOrEmpty(padStr) ? 0 : int.Parse(padStr);
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string value;
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switch (name)
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{
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case "item_no":
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value = item.ItemNo ?? "0";
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if (pad > 0)
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value = value.PadLeft(pad, '0');
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break;
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case "part_name":
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value = item.PartName ?? "";
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break;
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case "config":
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value = item.Configuration ?? "";
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break;
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case "material":
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value = item.Material ?? "";
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break;
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default:
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value = match.Value;
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break;
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}
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return value;
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});
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}
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/// <summary>
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/// Extracts the literal prefix before the first placeholder.
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/// Used for naming the xlsx and log files.
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/// Falls back to documentName if prefix is empty.
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/// </summary>
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public static string GetPrefix(string template, string documentName)
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{
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var match = PlaceholderPattern.Match(template);
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if (!match.Success)
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return template.Trim();
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var prefix = template.Substring(0, match.Index).Trim();
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if (string.IsNullOrEmpty(prefix))
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return Path.GetFileNameWithoutExtension(documentName);
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return prefix;
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}
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/// <summary>
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/// Validates that the template contains {item_no} to prevent filename collisions.
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/// </summary>
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public static bool Validate(string template, out string error)
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{
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error = null;
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if (string.IsNullOrWhiteSpace(template))
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{
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error = "Template cannot be empty.";
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return false;
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}
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var hasItemNo = PlaceholderPattern.Matches(template)
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.Cast<Match>()
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.Any(m => m.Groups["name"].Value.Equals("item_no", StringComparison.OrdinalIgnoreCase));
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if (!hasItemNo)
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{
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error = "Template must contain {item_no} or {item_no:N} to avoid filename collisions.";
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return false;
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}
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return true;
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}
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}
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}
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