Class: ERBLint::Linters::SpaceAroundErbTag

Inherits:
ERBLint::Linter show all
Includes:
ERBLint::LinterRegistry
Defined in:
lib/erb_lint/linters/space_around_erb_tag.rb

Overview

Enforce a single space after ‘<%` and before `%>` in the erb source. This linter ignores opening erb tags (`<%`) that are followed by a newline, and closing erb tags (`%>`) that are preceeded by a newline.

Constant Summary collapse

START_SPACES = 
/\A([[:space:]]*)/m
END_SPACES = 
/([[:space:]]*)\z/m

Constants included from ERBLint::LinterRegistry

ERBLint::LinterRegistry::CUSTOM_LINTERS_DIR

Instance Attribute Summary

Attributes inherited from ERBLint::Linter

#offenses

Instance Method Summary collapse

Methods included from ERBLint::LinterRegistry

clear, find_by_name, included, linters, load_custom_linters

Methods inherited from ERBLint::Linter

#add_offense, #clear_offenses, #enabled?, #excludes_file?, inherited, #initialize, support_autocorrect?

Constructor Details

This class inherits a constructor from ERBLint::Linter

Instance Method Details

#autocorrect(_processed_source, offense) ⇒ Object 



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# File 'lib/erb_lint/linters/space_around_erb_tag.rb', line 59

def autocorrect(_processed_source, offense)
  lambda do |corrector|
    corrector.replace(offense.source_range, offense.context)
  end
end

#run(processed_source) ⇒ Object 



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# File 'lib/erb_lint/linters/space_around_erb_tag.rb', line 14

def run(processed_source)
  processed_source.ast.descendants(:erb).each do |erb_node|
    indicator_node, ltrim, code_node, rtrim = *erb_node
    indicator = indicator_node&.loc&.source
    next if indicator == "#" || indicator == "%"
    code = code_node.children.first

    start_spaces = code.match(START_SPACES)&.captures&.first || ""
    if start_spaces.size != 1 && !start_spaces.include?("\n")
      add_offense(
        code_node.loc.resize(start_spaces.size),
        "Use 1 space after `<%#{indicator}#{ltrim&.loc&.source}` "\
        "instead of #{start_spaces.size} space#{"s" if start_spaces.size > 1}.",
        " "
      )
    elsif start_spaces.count("\n") > 1
      lines = start_spaces.split("\n", -1)
      add_offense(
        code_node.loc.resize(start_spaces.size),
        "Use 1 newline after `<%#{indicator&.loc&.source}#{ltrim&.loc&.source}` "\
        "instead of #{start_spaces.count("\n")}.",
        "#{lines.first}\n#{lines.last}"
      )
    end

    end_spaces = code.match(END_SPACES)&.captures&.first || ""
    if end_spaces.size != 1 && !end_spaces.include?("\n")
      add_offense(
        code_node.loc.end.adjust(begin_pos: -end_spaces.size),
        "Use 1 space before `#{rtrim&.loc&.source}%>` "\
        "instead of #{end_spaces.size} space#{"s" if start_spaces.size > 1}.",
        " "
      )
    elsif end_spaces.count("\n") > 1
      lines = end_spaces.split("\n", -1)
      add_offense(
        code_node.loc.end.adjust(begin_pos: -end_spaces.size),
        "Use 1 newline before `#{rtrim&.loc&.source}%>` "\
        "instead of #{end_spaces.count("\n")}.",
        "#{lines.first}\n#{lines.last}"
      )
    end
  end
end