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## This is basicly the code from fenekku's moustachu project with a few changes
## you can find it here: https://github.com/fenekku/moustachu
## A mustache templating engine written in Nim.
import strutils, sequtils, json
import moustachu_context, moustachu_tokenizer
export moustachu_context
proc lookupContext (contextStack: seq[Context], tagkey: string): Context =
## Return the Context associated with `tagkey` where `tagkey`
## can be a dotted tag e.g. a.b.c
## If the Context at `tagkey` does not exist, return nil.
var currCtx = contextStack[contextStack.high]
if tagkey == ".": return currCtx
let subtagkeys = tagkey.split(".")
for i in countDown(contextStack.high, contextStack.low):
currCtx = contextStack[i]
for subtagkey in subtagkeys:
currCtx = currCtx[subtagkey]
if currCtx == nil:
break
if currCtx != nil:
return currCtx
return currCtx
proc lookupString (contextStack: seq[Context], tagkey: string): string =
## Return the string associated with `tagkey` in Context `c`.
## If the Context at `tagkey` does not exist, return the empty string.
result = lookupContext(contextStack, tagkey).toString()
proc ignore (tag: string, tokens: seq[Token], index: int): int =
#ignore
var i = index + 1
var nexttoken = tokens[i]
var openedsections = 1
let lentokens = len(tokens)
while i < lentokens and openedsections > 0:
if nexttoken.value == tag:
if nexttoken.tokentype in [TokenType.section, TokenType.invertedsection]:
openedsections += 1
elif nexttoken.tokentype == TokenType.ender:
openedsections -= 1
else: discard
else: discard
i += 1
if i < lentokens:
nexttoken = tokens[i]
return i
proc parallelReplace (str: string, substitutions: openArray[tuple[pattern: string, by: string]]): string =
## Returns a modified copy of `str` with the `substitutions` applied
result = str
for sub in substitutions:
result = result.replace(sub[0], sub[1])
proc render* (tmplate: string, contextStack: seq[Context]): string =
## Take a mustache template `tmplate`, a seq of evaluation Context's
## and return the rendered string. This is the main procedure.
let
htmlReplaceBy = [("&", "&"),
("<", "<"),
(">", ">"),
("\\", "\"),
("\"", """)]
var renderings : seq[string] = @[]
#Object
var sections : seq[string] = @[]
var contextStack = contextStack
#Array
var loopStartPositions : seq[int] = @[]
var loopCounters : seq[int] = @[]
#Indentation
var indentation = ""
let tokens = toSeq(moustachu_tokenizer.tokenize(tmplate))
let lentokens = len(tokens)
var index = 0
while index < lentokens:
let token = tokens[index]
case token.tokentype
of TokenType.comment:
discard
of TokenType.escapedvariable:
var viewvalue = contextStack.lookupString(token.value)
viewvalue = viewvalue.parallelReplace(htmlReplaceBy)
renderings.add(viewvalue)
of TokenType.unescapedvariable:
var viewvalue = contextStack.lookupString(token.value)
renderings.add(viewvalue)
of TokenType.section:
let ctx = contextStack.lookupContext(token.value)
if ctx == nil:
index = ignore(token.value, tokens, index)
continue
elif ctx.kind == CObject:
# enter a new section
if ctx.len == 0:
index = ignore(token.value, tokens, index)
continue
else:
contextStack.add(ctx)
sections.add(token.value)
elif ctx.kind == CArray:
# update the array loop stacks
if ctx.len == 0:
index = ignore(token.value, tokens, index)
continue
else:
#do looping
index += 1
loopStartPositions.add(index)
loopCounters.add(ctx.len)
sections.add(token.value)
contextStack.add(ctx[ctx.len - loopCounters[^1]])
continue
elif ctx.kind == CValue:
if not ctx:
index = ignore(token.value, tokens, index)
continue
else: discard #we will render the text inside the section
of TokenType.invertedsection:
let ctx = contextStack.lookupContext(token.value)
if ctx != nil:
if ctx.kind == CObject:
index = ignore(token.value, tokens, index)
continue
elif ctx.kind == CArray:
if ctx.len != 0:
index = ignore(token.value, tokens, index)
continue
elif ctx.kind == CValue:
if ctx:
index = ignore(token.value, tokens, index)
continue
else: discard #we will render the text inside the section
of TokenType.ender:
var ctx = contextStack.lookupContext(token.value)
if ctx != nil:
if ctx.kind == CObject:
discard contextStack.pop()
discard sections.pop()
elif ctx.kind == CArray:
if ctx.len > 0:
loopCounters[^1] -= 1
discard contextStack.pop()
if loopCounters[^1] == 0:
discard loopCounters.pop()
discard loopStartPositions.pop()
discard sections.pop()
else:
index = loopStartPositions[^1]
contextStack.add(ctx[ctx.len - loopCounters[^1]])
continue
of TokenType.indenter:
if token.value != "":
indentation = token.value
renderings.add(indentation)
else:
renderings.add(token.value)
index += 1
result = join(renderings, "")
proc render* (tmplate: string, c: Context): string =
## Take a mustache template `tmplate`, an evaluation Context `c`
## and return the rendered string.
var contextStack = @[c]
result = tmplate.render(contextStack)
proc render* (tmplate: string, jsonContext: JsonNode): string {.exportc.} =
## Take a mustache template `tmplate`, an evaluation context as a JsonNode
## and return the rendered string.
let nc = newContext(jsonContext)
var contextStack = @[nc]
result = tmplate.render(contextStack)