tiny.smg.span

1pub const span = @import("span.zig");

1const std = @import("std");2const lines = @import("lines.zig");34pub fn trimmed(source_lines: lines.SourceLines, line: i64, end_line: i64) []const u8 {5    const start_raw = lines.lineStartByte(source_lines, line);6    const end_raw = lines.lineEndByte(source_lines, end_line);7    if (start_raw >= end_raw) return "";8    var start = start_raw;9    var end = end_raw;10    while (start < end and std.ascii.isWhitespace(source_lines.source[start])) start += 1;11    while (end > start and std.ascii.isWhitespace(source_lines.source[end - 1])) end -= 1;12    return source_lines.source[start..end];13}1415pub fn startsWith(source_lines: lines.SourceLines, line: i64, end_line: i64, prefix: []const u8) bool {16    return std.mem.startsWith(u8, trimmed(source_lines, line, end_line), prefix);17}1819test "trimmed span removes surrounding whitespace" {20    const source = "  first\r\nsecond\n third";21    var source_lines = try lines.SourceLines.init(std.testing.allocator, .{ .source = source });22    defer source_lines.deinit(std.testing.allocator);23    source_lines.fill();24    source_lines.activate();2526    try std.testing.expectEqualStrings("first", trimmed(source_lines, 1, 1));27    try std.testing.expect(startsWith(source_lines, 3, 3, "third"));28}