Parse trailing comments from buses data in v30 files

src/PowerFlowData.jl

@@ -1,7 +1,7 @@
 module PowerFlowData
 
 using DocStringExtensions
-using InlineStrings: InlineString1, InlineString3, InlineString15
+using InlineStrings: InlineString1, InlineString3, InlineString15, InlineString31
 using Parsers: Parsers, xparse, checkdelim!
 using Parsers: codes, eof, invalid, invaliddelimiter, newline, valueok, peekbyte
 using PrettyTables: pretty_table

src/parsing.jl

@@ -244,6 +244,51 @@ end
     return block
 end
 
+###
+### Buses
+###
+
+# In v30 files, we've seen trailing end-of-line comments. These can be present
+# in any section, but so far we have only had a use-case for the comments in the
+# buses section.
+# See https://github.com/nickrobinson251/PowerFlowData.jl/issues/27
+#
+# The currently handles data which looks like:
+#  111,'STBC      ',161.00,1,    0.00,    0.00,227,   1,1.09814,  -8.327,  1 /* [STBC   1   ] */
+# And does _not_ handle data with a comma before the comment like:
+#  111,'STBC      ',161.00,1,    0.00,    0.00,227,   1,1.09814,  -8.327,  1, /* [STBC   1   ] */
+@generated function parse_row!(rec::R, bytes, pos, len, options) where {R <: Buses30}
+    block = Expr(:block)
+    n = fieldcount(R)
+    # The last column is the comment. We need to handle the second-last column separately
+    # too in order to be sure we stop parsing it before hitting the comment.
+    for col in 1:(n - 2)
+        T = eltype(fieldtype(R, col))
+        push!(block.args, quote
+            rec, pos, code = parse_value!(rec, $col, $T, bytes, pos, len, options)
+        end)
+    end
+    m = n - 1
+    Tm = eltype(fieldtype(R, m))
+    Tn = eltype(fieldtype(R, n))
+    push!(block.args, quote
+        # @show (rec, pos, code)
+		# Assume no comma delim before the comment, so need to set whitespace as delim.
+		# And move to next non-whitespace character, so we don't immediately hit a delim.
+        pos = checkdelim!(bytes, pos, len, OPTIONS_SPACE)
+        (rec, pos, code) = parse_value!(rec, $m, $Tm, bytes, pos, len, OPTIONS_SPACE)
+        if newline(code)
+			# If we hit a newline before delimiter there is no trailing comment.
+            push!(getfield(rec, $n)::Vector{$Tn}, missing)
+        else
+            (rec, pos, code) = parse_value!(rec, $n, $Tn, bytes, pos, len, options)
+        end
+    end)
+    push!(block.args, :(return rec, pos))
+    # @show block
+    return block
+end
+
 ###
 ### transformers
 ###

src/types.jl

@@ -146,6 +146,11 @@ struct Buses30 <: Buses
     See [`Owners`](@ref).
     """
     owner::Vector{OwnerNum}
+    """
+    End-of-line comments. Not part of the official PSS/E format specification, but
+    present in some files nonetheless.
+    """
+    comment::Vector{Union{InlineString31,Missing}}
 end
 
 """

test/runtests.jl

@@ -94,7 +94,7 @@ using Test
         @test startswith(repr(mime, net.caseid), "CaseID: (ic = 0, sbase = 100.0, ")
 
         @test repr(mime, net.buses; context=(:compact => true)) == "Buses with 2 records"
-        @test startswith(repr(mime, net.buses), "Buses with 2 records, 11 columns:\n──")
+        @test startswith(repr(mime, net.buses), "Buses with 2 records, 12 columns:\n──")
 
         mt_dc_line = net.multi_terminal_dc.lines[1]
         @test eval(Meta.parse(repr(mt_dc_line))) isa MultiTerminalDCLine
@@ -497,6 +497,23 @@ using Test
         @test net_space.branches.j == net_space_manual.branches.j
     end
 
+    @testset "End-of-line comments" begin
+        net_eol = parse_network("testfiles/eolcomments.raw")
+
+        # Only `Buses30` parse trailing EOL comments.
+        buses = net_eol.buses
+        @test length(buses) == 2
+        @test buses.i == [10010, 337918]  # first col
+        @test buses.owner == [1, 1]   # last col before comments
+        @test all(contains.(buses.comment, ["NOBO     1", "NAU_E2   1"]))
+
+        loads = net_eol.loads
+        @test length(loads) == 1
+        @test loads.i == [10010]  # first col
+        @test loads.owner == [1]  # last non-missing col
+        @test isequal(loads.intrpt, [missing]) # last col
+    end
+
     @testset "issues" begin
         sz = parse_network("testfiles/spacezero.raw")
         @test length(sz.buses) == 2

test/testfiles/eolcomments.raw

@@ -0,0 +1,7 @@
+0,100.0,30 / PSS(tm)E-30 RAW created      Thu, Oct 13 2018 13:08
+   SEP 2018 V2 MODEL
+   MADE ON 13-Oct-2018 13:08@
+ 10010,'NOBO        ',161.00,1,    0.00,    0.00,327,   1,1.03182,   5.469,  1 /* [NOBO     1   ] */
+337918,'3NAUNEPPE-2+',115.00,1,    0.00,    0.00,327,   1,1.01644,   0.679,  1 /* [NAU_E2   1   ] */
+0  / end of bus cards
+ 10010,'T1',1,327,   1,    7.698,    4.063,    9.463,   16.549,   -1.802,    2.043,  1 /* [NOBO     T1                   ] */