use proper types for bbstring

src/bbansi.nim

@@ -1,74 +1,156 @@
-# This is just an example to get you started. A typical hybrid package
-# uses this file as the main entry point of the application.
-import std/[os, strutils]
+import std/[os, sequtils, strutils, sugar]
 import bbansi/styles
 
-# TODO: add support for some kind of FORCE_COLOR
+# TODO: add support for some kind of FORCE_COLOR and detect terminals...
 let noColor = os.getEnv("NO_COLOR") != ""
 
+type
+  BbSpan = object
+    styles: seq[string]
+    slice: array[2, int]
+  BbString = object
+    raw: string
+    plain: string
+    spans: seq[BbSpan]
 
-proc bb*(s: string): string =
+proc debug(bbs: BbString): string =
+  echo "bbString("
+  echo "  raw: ", bbs.raw
+  echo "  plain: ", bbs.plain
+  echo "  spans: ", bbs.spans
+  echo ")"
+
+proc `&`*(x: BbString, y: string): BbString =
+  result = x
+  result.raw &= y
+  result.plain &= y
+  result.spans[^1].slice[1] = result.plain.len-1
+
+proc `&`*(x: string, y: BbString): BbString =
+  result.raw = x & y.raw
+  result.plain = x & y.plain
+  result.spans.add BbSpan(styles: @[],slice: [0, x.len-1] )
+  for span in y.spans:
+    let
+      length = x.len
+      styles = span.styles
+      slice = span.slice
+    result.spans.add BbSpan(styles: styles, slice: [slice[0]+length,slice[1]+length])
+
+func len*(bbs: BbString): int = bbs.plain.len
+
+proc `$`*(bbs: BbString): string =
+  if noColor: return bbs.plain
+
+  for span in bbs.spans:
+    var codes = ""
+    if span.styles.len > 0:
+      codes = collect(for style in span.styles: style.toAnsiCode).join("")
+
+    result.add codes
+    result.add bbs.plain[span.slice[0]..span.slice[1]]
+
+    if codes != "":
+      result.add bbReset
+
+proc endSpan(bbs: var BbString) =
+  bbs.spans[^1].slice[1] = bbs.plain.len-1
+
+proc newSpan(bbs: var BbString, pattern: string) =
+  bbs.spans.add BbSpan(styles: @[pattern], slice: [bbs.plain.len, 0])
+
+proc resetSpan(bbs: var BbString) =
+  bbs.endSpan
+  bbs.spans.add BbSpan(styles: @[], slice: [bbs.plain.len, 0])
+
+proc closeLastStyle(bbs: var BbString) =
+  bbs.endSpan
+  let newStyle = bbs.spans[^1].styles[0..^2] # drop the latest style
+  bbs.spans.add BbSpan(styles: newStyle, slice: [bbs.plain.len, 0])
+
+proc addToSpan(bbs: var BbString, pattern: string) =
+  bbs.endSpan
+  let currStyl = bbs.spans[^1].styles
+  bbs.spans.add BbSpan(styles: currStyl & @[pattern], slice: [bbs.plain.len, 0])
+
+proc closeStyle(bbs: var BbString, pattern: string) =
+  let style = pattern[1..^1].strip()
+  if style in bbs.spans[^1].styles:
+    bbs.endSpan
+    let newStyle = bbs.spans[^1].styles.filterIt(it != style) # use sets instead
+    bbs.spans.add BbSpan(styles: newStyle, slice: [bbs.plain.len, 0])
+
+proc closeFinalSpan(bbs: var BbString) =
+  if bbs.spans.len >= 1 and bbs.spans[^1].slice[1] == 0:
+    bbs.endSpan
+
+proc bb*(s: string): BbString =
   ## convert bbcode markup to ansi escape codes
   var
+    pattern: string
     i = 0
-    addReset = false
-    pattern = ""
-    preChar = ' '
+
+  template next = result.plain.add s[i]; inc i
+  template incPattern = pattern.add s[i]; inc i
+  template resetPattern = pattern = ""; inc i
+
+  result.raw = s
+  if not s.startswith('[') or s.startswith("[["):
+    result.spans.add BbSpan()
 
   while i < s.len:
-    # start extracting pattern when you see '[' but not '[['
-    if s[i] == '\\':
+    case s[i]:
+      of '\\':
+        if i < s.len and s[i+1] == '[':
           inc i
-      if s[i] == '[':
-        result.add s[i]
-        inc i
-        continue
-
-    if s[i] == '[' and preChar != '\\':
+        next
+      of '[':
+        if i < s.len and s[i+1] == '[':
+          inc i; next; continue
         inc i
         while i < s.len and s[i] != ']':
-        preChar = s[i]
-        pattern.add s[i]
-        inc i
-
-      if noColor:
-        inc i
-        continue
-      if pattern in ["reset","/"]:
-        result.add bbReset
-        addReset = false
+          incPattern
+        pattern = pattern.strip()
+        if result.spans.len > 0:
+          if pattern == "/": result.closeLastStyle
+          elif pattern == "reset": result.resetSpan
+          elif pattern.startswith('/'): result.closeStyle pattern
+          else: result.addToSpan pattern
+        else: result.newSpan pattern
+        resetPattern
       else:
-        for style in pattern.splitWhitespace():
-          if style in codeMap:
-            addReset = true
-            result.add "\e[" & codeMap[style] & "m"
-      pattern = ""
-      inc i
-    else:
-      preChar = s[i]
-      result.add s[i]
-      inc i
+        next
+  result.closeFinalSpan
 
-  if addReset:
-    result.add "\e[0m"
+proc `&`*(x: BbString, y: BbString): Bbstring =
+  # there is probably a more efficient way to do this
+  bb(x.raw & y.raw)
 
+
+# ---- cli
 when isMainModule:
   import std/[strformat, parseopt]
   const version = staticExec "git describe --tags --always --dirty=-dev"
   let help = &"""
-{bb"[bold]bbansi[/] [green]<args>[/] [black]<-h|-v>[/]"}
+{bb"[bold]bbansi[/] \[[green]args...[/]] [faint]\[-h|-v][/]"}
 
-usage:
+{bb"[italic]usage"}:
   bbansi "[yellow] yellow text!"
     |-> {bb"[yellow] yellow text!"}
-  bbansi "[bold red] bold red[/] plain text..." 
+  bbansi "[bold red] bold red text[/] plain text..." 
     |-> {bb"[bold red] bold red text[/] plain text..."}
-"""
+
+flags:
+  """ & $(bb(collect(for (s, l, d) in [
+        ("h", "help", "show this help"),
+        ("v", "version", "show version")]:
+        &"[yellow]-{s}[/]  [green]--{l.alignLeft(8)}[/] | {d}").join("\n  ")
+        ))
   proc writeHelp() =
     echo help
     quit(QuitSuccess)
   proc writeVersion() =
-    echo "bbansi version -> ", version
+    echo bb(&"[yellow]bbansi version[/][red] ->[/] [bold]{version}[/]")
     quit(QuitSuccess)
   var strArgs: seq[string]
   var p = initOptParser()
@@ -85,15 +167,13 @@ usage:
 
     of cmdArgument:
       strArgs.add key
-
-  if strArgs.len != 0:
+  if strArgs.len == 0:
+    echo help
+    quit(QuitSuccess)
   for arg in strArgs:
     echo arg.bb
-  else:
-    echo "[bold]---------------------".bb
-    echo bb"[bold]bold"
-    echo bb"[red]red"
-    echo bb"[bold red]bold red"
-    echo bb"[bold red]bold red[reset] no more red" 
-    echo bb"[unknown]this text is red no?"
-    echo bb"\[red] <- not a pattern "
+
+  echo "---------->"
+  echo "\e[31mRed Text\e[0m\nNext Line"
+  echo "[red]Red Text[/red]\nNext Line".bb
+  echo "---------->"

src/bbansi/styles.nim

@@ -1,28 +1,58 @@
 
-import strtabs
+import std/[strtabs, strutils]
 
 export strtabs
 
 let bbReset* = "\e[0m"
 
-# should these be an enum?
-let
-  codeMap* = {
-    "reset":"0",
-    "bold": "1",
-    "faint": "2",
-    "italic":"3",
-    "underline":"4",
-    "blink":"5",
-    "reverse":"7",
-    "conceal":"8",
-    "strike":"9",
-    "black":"30",
-    "red": "31",
-    "green":"32",
-    "yellow":"33",
-    "blue":"34",
-    "magenta":"35",
-    "cyan":"36",
-    "white":"37",
-  }.newStringTable(modeCaseInsensitive)
+type
+  BbStyle = enum
+    bold = 1,
+    faint,
+    italic,
+    underline,
+    blink,
+    reverse,
+    conceal,
+    strike,
+    black = 30
+    red,
+    green,
+    yellow,
+    blue,
+    magenta,
+    cyan,
+    white
+
+
+proc toAnsiCode*(s: string): string =
+  var 
+    styles: seq[string]
+    bgStyle: string
+  if " on " in s:
+    let fg_bg_split = s.rsplit(" on ", maxsplit=1)
+    styles = fg_bg_split[0].splitWhitespace()
+    bgStyle = fg_bg_split[1].strip()
+  else:
+    styles = s.splitWhitespace()
+  for style in styles:
+    try:
+      var bbStyle: BbStyle
+      if style.len == 1:
+        bbstyle = parseEnum[BbStyle](
+          case style:
+          of "b": "bold"
+          of "i": "italic"
+          of "u": "underline"
+          else: "" # this parse enum lookup is unneccesary
+        )
+      else:
+        bbstyle = parseEnum[BbStyle](style)
+      # if we fail to parse treat it like a noop..
+      result.add "\e[" & $bbStyle.ord() & "m"
+    except ValueError: discard
+    try:
+      let bbStyle = parseEnum[BbStyle](bgStyle)
+      result.add "\e[" & $(bbStyle.ord()+10) & "m"
+    except ValueError: discard
+

tests/tbasic.nim

@@ -8,14 +8,35 @@
 import unittest
 
 import bbansi
-test "basic":
-  check "\e[31mRed Text\e[0m" == bb"[red]Red Text"
-  check "No Style" == bb"No Style"
-  check "Unknown Style" == bb"[unknown]Unknown Style"
-  check "\e[1m\e[31mBold Red Text\e[0m" == bb"[bold red]Bold Red Text"
-  check "\e[1m\e[31mBold Red Text\e[0mPlain Text" == bb"[bold red]Bold Red Text[reset]Plain Text"
-  check "\e[1mBold\e[0m Not Bold" == bb"[bold]Bold[/] Not Bold"
-  # not sure how rich handles this
+
+suite "basic":
+  test "simple":
+    check "\e[31mRed Text\e[0m" == $bb"[red]Red Text"
+    check "\e[33mYellow Text\e[0m" == $bb"[yellow]Yellow Text"
+    check "\e[1m\e[31mBold Red Text\e[0m" == $bb"[bold red]Bold Red Text"
+
+  test "closing":
+    check "\e[1mBold\e[0m\e[1m\e[31m Bold Red\e[0m\e[1m Bold Only\e[0m" ==
+      $bb"[bold]Bold[red] Bold Red[/red] Bold Only"
+
+  test "abbreviated":
+    check "\e[1mBold\e[0m Not Bold" == $bb"[b]Bold[/] Not Bold"
+
+  test "noop":
+    check "No Style" == $bb"No Style"
+    check "Unknown Style" == $bb"[unknown]Unknown Style"
 
   test "escaped":
-  check "[red] ignored pattern" == bb"\[red] ignored pattern"
+    check "[red] ignored pattern" == $"[[red] ignored pattern".bb
+
+  test "newlines":
+    # Proc Strings: raw strings,
+    # but the method name that prefixes the string is called
+    # so that foo"12\" -> foo(r"12\")
+    check "\e[31mRed Text\e[0m\nNext Line" == $"[red]Red Text[/]\nNext Line".bb
+
+  test "concat-ops":
+    check "[red]RED[/]".bb & " plain string" == "[red]RED[/] plain string".bb
+    check "[red]RED[/]".bb.len == 3
+    check bb("[blue]Blue[/]") & " " & bb("[red]Red[/]") == "[blue]Blue[/] [red]Red[/]".bb
+    check "a plain string" & "[blue] a blue string".bb == "a plain string[blue] a blue string".bb