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#
#
# The Nimrod Compiler
# (c) Copyright 2011 Andreas Rumpf
#
# See the file "copying.txt", included in this
# distribution, for details about the copyright.
#
# This module implements Nimrod's standard template filter.
import
llstream, os, wordrecg, idents, strutils, ast, astalgo, msgs, options,
rnimsyn, filters
proc filterTmpl*(stdin: PLLStream, filename: string, call: PNode): PLLStream
# #! template(subsChar='$', metaChar='#') | standard(version="0.7.2")
# implementation
type
TParseState = enum
psDirective, psTempl
TTmplParser{.final.} = object
inp: PLLStream
state: TParseState
info: TLineInfo
indent, emitPar: int
x: string # the current input line
outp: PLLStream # the ouput will be parsed by pnimsyn
subsChar, NimDirective: Char
emit, conc, toStr: string
curly, bracket, par: int
pendingExprLine: bool
const
PatternChars = {'a'..'z', 'A'..'Z', '0'..'9', '\x80'..'\xFF', '.', '_'}
proc newLine(p: var TTmplParser) =
LLStreamWrite(p.outp, repeatChar(p.emitPar, ')'))
p.emitPar = 0
if p.info.line > int16(1): LLStreamWrite(p.outp, "\n")
if p.pendingExprLine:
LLStreamWrite(p.outp, repeatChar(2))
p.pendingExprLine = false
proc scanPar(p: var TTmplParser, d: int) =
var i = d
while true:
case p.x[i]
of '\0': break
of '(': inc(p.par)
of ')': dec(p.par)
of '[': inc(p.bracket)
of ']': dec(p.bracket)
of '{': inc(p.curly)
of '}': dec(p.curly)
else: nil
inc(i)
proc withInExpr(p: TTmplParser): bool {.inline.} =
result = p.par > 0 or p.bracket > 0 or p.curly > 0
proc parseLine(p: var TTmplParser) =
var
d, j, curly: int
keyw: string
j = 0
while p.x[j] == ' ': inc(j)
if (p.x[0] == p.NimDirective) and (p.x[0 + 1] == '!'):
newLine(p)
elif (p.x[j] == p.NimDirective):
newLine(p)
inc(j)
while p.x[j] == ' ': inc(j)
d = j
keyw = ""
while p.x[j] in PatternChars:
add(keyw, p.x[j])
inc(j)
scanPar(p, j)
p.pendingExprLine = withInExpr(p) or llstream.endsWithOpr(p.x)
case whichKeyword(keyw)
of wEnd:
if p.indent >= 2:
dec(p.indent, 2)
else:
p.info.col = int16(j)
LocalError(p.info, errXNotAllowedHere, "end")
LLStreamWrite(p.outp, repeatChar(p.indent))
LLStreamWrite(p.outp, "#end")
of wIf, wWhen, wTry, wWhile, wFor, wBlock, wCase, wProc, wIterator,
wConverter, wMacro, wTemplate, wMethod:
LLStreamWrite(p.outp, repeatChar(p.indent))
LLStreamWrite(p.outp, copy(p.x, d))
inc(p.indent, 2)
of wElif, wOf, wElse, wExcept, wFinally:
LLStreamWrite(p.outp, repeatChar(p.indent - 2))
LLStreamWrite(p.outp, copy(p.x, d))
else:
LLStreamWrite(p.outp, repeatChar(p.indent))
LLStreamWrite(p.outp, copy(p.x, d))
p.state = psDirective
else:
# data line
# reset counters
p.par = 0
p.curly = 0
p.bracket = 0
j = 0
case p.state
of psTempl:
# next line of string literal:
LLStreamWrite(p.outp, p.conc)
LLStreamWrite(p.outp, "\n")
LLStreamWrite(p.outp, repeatChar(p.indent + 2))
LLStreamWrite(p.outp, "\"")
of psDirective:
newLine(p)
LLStreamWrite(p.outp, repeatChar(p.indent))
LLStreamWrite(p.outp, p.emit)
LLStreamWrite(p.outp, "(\"")
inc(p.emitPar)
p.state = psTempl
while true:
case p.x[j]
of '\0':
break
of '\x01'..'\x1F', '\x80'..'\xFF':
LLStreamWrite(p.outp, "\\x")
LLStreamWrite(p.outp, toHex(ord(p.x[j]), 2))
inc(j)
of '\\':
LLStreamWrite(p.outp, "\\\\")
inc(j)
of '\'':
LLStreamWrite(p.outp, "\\\'")
inc(j)
of '\"':
LLStreamWrite(p.outp, "\\\"")
inc(j)
else:
if p.x[j] == p.subsChar:
# parse Nimrod expression:
inc(j)
case p.x[j]
of '{':
p.info.col = int16(j)
LLStreamWrite(p.outp, '\"')
LLStreamWrite(p.outp, p.conc)
LLStreamWrite(p.outp, p.toStr)
LLStreamWrite(p.outp, '(')
inc(j)
curly = 0
while true:
case p.x[j]
of '\0':
LocalError(p.info, errXExpected, "}")
break
of '{':
inc(j)
inc(curly)
LLStreamWrite(p.outp, '{')
of '}':
inc(j)
if curly == 0: break
if curly > 0: dec(curly)
LLStreamWrite(p.outp, '}')
else:
LLStreamWrite(p.outp, p.x[j])
inc(j)
LLStreamWrite(p.outp, ')')
LLStreamWrite(p.outp, p.conc)
LLStreamWrite(p.outp, '\"')
of 'a'..'z', 'A'..'Z', '\x80'..'\xFF':
LLStreamWrite(p.outp, '\"')
LLStreamWrite(p.outp, p.conc)
LLStreamWrite(p.outp, p.toStr)
LLStreamWrite(p.outp, '(')
while p.x[j] in PatternChars:
LLStreamWrite(p.outp, p.x[j])
inc(j)
LLStreamWrite(p.outp, ')')
LLStreamWrite(p.outp, p.conc)
LLStreamWrite(p.outp, '\"')
else:
if p.x[j] == p.subsChar:
LLStreamWrite(p.outp, p.subsChar)
inc(j)
else:
p.info.col = int16(j)
LocalError(p.info, errInvalidExpression, "$")
else:
LLStreamWrite(p.outp, p.x[j])
inc(j)
LLStreamWrite(p.outp, "\\n\"")
proc filterTmpl(stdin: PLLStream, filename: string, call: PNode): PLLStream =
var p: TTmplParser
p.info = newLineInfo(filename, 0, 0)
p.outp = LLStreamOpen("")
p.inp = stdin
p.subsChar = charArg(call, "subschar", 1, '$')
p.nimDirective = charArg(call, "metachar", 2, '#')
p.emit = strArg(call, "emit", 3, "result.add")
p.conc = strArg(call, "conc", 4, " & ")
p.toStr = strArg(call, "tostring", 5, "$")
while not LLStreamAtEnd(p.inp):
p.x = LLStreamReadLine(p.inp)
p.info.line = p.info.line + int16(1)
parseLine(p)
newLine(p)
result = p.outp
LLStreamClose(p.inp)
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