NimYAML/server/server.nim

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# NimYAML - YAML implementation in Nim
# (c) Copyright 2015 Felix Krause
#
# See the file "copying.txt", included in this
# distribution, for details about the copyright.
import jester, asyncdispatch, json, streams, strutils
import packages.docutils.rstgen, packages.docutils.highlite
import ../yaml
routes:
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get "/":
headers["Content-Type"] = "text/plain"
resp "I am a friendly NimYAML parser webservice."
post "/":
var
style: PresentationStyle
resultNode = newJObject()
msg: string
retStatus = Http200
contentType = "application/json"
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headers["Access-Control-Allow-Origin"] = "*"
headers["Pragma"] = "no-cache"
headers["Cache-Control"] = "no-cache"
headers["Expires"] = "0"
try:
case @"style"
of "minimal": style = psMinimal
of "canonical": style = psCanonical
of "default": style = psDefault
of "json": style = psJson
of "block": style = psBlockOnly
of "tokens":
var
output = "+STR\n"
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parser = newYamlParser()
events = parser.parse(newStringStream(@"input"))
for event in events: output.add($event & "\n")
output &= "-STR"
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resultNode["code"] = %0
resultNode["output"] = %output
msg = resultNode.pretty
else:
retStatus = Http400
msg = "Invalid style: " & escape(@"style")
contentType = "text/plain;charset=utf8"
if isNil(msg):
var
output = newStringStream()
highlighted = ""
transform(newStringStream(@"input"), output, defineOptions(style), true)
# syntax highlighting (stolen and modified from stlib's rstgen)
var g: GeneralTokenizer
g.initGeneralTokenizer(output.data)
while true:
g.getNextToken(langYaml)
case g.kind
of gtEof: break
of gtNone, gtWhitespace:
highlighted.add(substr(output.data, g.start, g.length + g.start - 1))
else:
highlighted.addf("<span class=\"$2\">$1</span>", "\\span$2{$1}", [
esc(outHtml, substr(output.data, g.start, g.length+g.start-1)),
tokenClassToStr[g.kind]])
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resultNode["code"] = %0
resultNode["output"] = %highlighted
msg = resultNode.pretty
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except YamlParserError:
let e = (ref YamlParserError)(getCurrentException())
resultNode["code"] = %1
resultNode["line"] = %e.line
resultNode["column"] = %e.column
resultNode["message"] = %e.msg
resultNode["detail"] = %e.lineContent
msg = resultNode.pretty
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except YamlPresenterJsonError:
let e = getCurrentException()
resultNode["code"] = %2
resultNode["message"] = %e.msg
msg = resultNode.pretty
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except:
let e = getCurrentException()
msg = "Name: " & $e.name & "\nMessage: " & e.msg &
"\nTrace:\n" & e.getStackTrace
retStatus = Http500
contentType = "text/plain;charset=utf-8"
resp retStatus, msg, contentType
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runForever()