diff options
Diffstat (limited to 'lib/syntax_suggest/block_expand.rb')
| -rw-r--r-- | lib/syntax_suggest/block_expand.rb | 113 |
1 files changed, 102 insertions, 11 deletions
diff --git a/lib/syntax_suggest/block_expand.rb b/lib/syntax_suggest/block_expand.rb index 396b2c3a1a..2751ae2a64 100644 --- a/lib/syntax_suggest/block_expand.rb +++ b/lib/syntax_suggest/block_expand.rb @@ -35,30 +35,121 @@ module SyntaxSuggest @code_lines = code_lines end + # Main interface. Expand current indentation, before + # expanding to a lower indentation def call(block) if (next_block = expand_neighbors(block)) - return next_block + next_block + else + expand_indent(block) end - - expand_indent(block) end + # Expands code to the next lowest indentation + # + # For example: + # + # 1 def dog + # 2 print "dog" + # 3 end + # + # If a block starts on line 2 then it has captured all it's "neighbors" (code at + # the same indentation or higher). To continue expanding, this block must capture + # lines one and three which are at a different indentation level. + # + # This method allows fully expanded blocks to decrease their indentation level (so + # they can expand to capture more code up and down). It does this conservatively + # as there's no undo (currently). def expand_indent(block) - AroundBlockScan.new(code_lines: @code_lines, block: block) - .skip(:hidden?) + now = AroundBlockScan.new(code_lines: @code_lines, block: block) + .force_add_hidden .stop_after_kw .scan_adjacent_indent - .code_block + + now.lookahead_balance_one_line + + now.code_block end + # A neighbor is code that is at or above the current indent line. + # + # First we build a block with all neighbors. If we can't go further + # then we decrease the indentation threshold and expand via indentation + # i.e. `expand_indent` + # + # Handles two general cases. + # + # ## Case #1: Check code inside of methods/classes/etc. + # + # It's important to note, that not everything in a given indentation level can be parsed + # as valid code even if it's part of valid code. For example: + # + # 1 hash = { + # 2 name: "richard", + # 3 dog: "cinco", + # 4 } + # + # In this case lines 2 and 3 will be neighbors, but they're invalid until `expand_indent` + # is called on them. + # + # When we are adding code within a method or class (at the same indentation level), + # use the empty lines to denote the programmer intended logical chunks. + # Stop and check each one. For example: + # + # 1 def dog + # 2 print "dog" + # 3 + # 4 hash = { + # 5 end + # + # If we did not stop parsing at empty newlines then the block might mistakenly grab all + # the contents (lines 2, 3, and 4) and report them as being problems, instead of only + # line 4. + # + # ## Case #2: Expand/grab other logical blocks + # + # Once the search algorithm has converted all lines into blocks at a given indentation + # it will then `expand_indent`. Once the blocks that generates are expanded as neighbors + # we then begin seeing neighbors being other logical blocks i.e. a block's neighbors + # may be another method or class (something with keywords/ends). + # + # For example: + # + # 1 def bark + # 2 + # 3 end + # 4 + # 5 def sit + # 6 end + # + # In this case if lines 4, 5, and 6 are in a block when it tries to expand neighbors + # it will expand up. If it stops after line 2 or 3 it may cause problems since there's a + # valid kw/end pair, but the block will be checked without it. + # + # We try to resolve this edge case with `lookahead_balance_one_line` below. def expand_neighbors(block) - expanded_lines = AroundBlockScan.new(code_lines: @code_lines, block: block) - .skip(:hidden?) + now = AroundBlockScan.new(code_lines: @code_lines, block: block) + + # Initial scan + now + .force_add_hidden .stop_after_kw - .scan_neighbors - .scan_while { |line| line.empty? } # Slurp up empties + .scan_neighbors_not_empty + + # Slurp up empties + now + .scan_while { |line| line.empty? } + + # If next line is kw and it will balance us, take it + expanded_lines = now + .lookahead_balance_one_line .lines + # Don't allocate a block if it won't be used + # + # If nothing was taken, return nil to indicate that status + # used in `def call` to determine if + # we need to expand up/out (`expand_indent`) if block.lines == expanded_lines nil else @@ -66,7 +157,7 @@ module SyntaxSuggest end end - # Managable rspec errors + # Manageable rspec errors def inspect "#<SyntaxSuggest::CodeBlock:0x0000123843lol >" end |