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#
#
# The Nim Compiler
# (c) Copyright 2012 Andreas Rumpf
#
# See the file "copying.txt", included in this
# distribution, for details about the copyright.
#
# This module implements Nim's standard template filter.
import
llstream, ast, msgs, options,
filters, lineinfos, pathutils
import std/strutils
type
TParseState = enum
psDirective, psTempl
TTmplParser = object
inp: PLLStream
state: TParseState
info: TLineInfo
indent, emitPar: int
x: string # the current input line
outp: PLLStream # the output will be parsed by parser
subsChar, nimDirective: char
emit, conc, toStr: string
curly, bracket, par: int
pendingExprLine: bool
config: ConfigRef
const
PatternChars = {'a'..'z', 'A'..'Z', '0'..'9', '\x80'..'\xFF', '.', '_'}
proc newLine(p: var TTmplParser) =
llStreamWrite(p.outp, repeat(')', p.emitPar))
p.emitPar = 0
if p.info.line > uint16(1): llStreamWrite(p.outp, "\n")
if p.pendingExprLine:
llStreamWrite(p.outp, spaces(2))
p.pendingExprLine = false
proc scanPar(p: var TTmplParser, d: int) =
var i = d
while i < p.x.len:
case p.x[i]
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: discard
inc(i)
proc withInExpr(p: TTmplParser): bool {.inline.} =
result = p.par > 0 or p.bracket > 0 or p.curly > 0
const
LineContinuationOprs = {'+', '-', '*', '/', '\\', '<', '>', '^',
'|', '%', '&', '$', '@', '~', ','}
proc parseLine(p: var TTmplParser) =
var j = 0
let len = p.x.len
while j < len and p.x[j] == ' ': inc(j)
if len >= 2 and p.x[0] == p.nimDirective and p.x[1] == '?':
newLine(p)
elif j < len and p.x[j] == p.nimDirective:
newLine(p)
inc(j)
while j < len and p.x[j] == ' ': inc(j)
let d = j
var keyw = ""
while j < len and p.x[j] in PatternChars:
keyw.add(p.x[j])
inc(j)
scanPar(p, j)
p.pendingExprLine = withInExpr(p) or p.x.endsWith(LineContinuationOprs)
case keyw
of "end":
if p.indent >= 2:
dec(p.indent, 2)
else:
p.info.col = int16(j)
localError(p.config, p.info, "'end' does not close a control flow construct")
llStreamWrite(p.outp, spaces(p.indent))
llStreamWrite(p.outp, "#end")
of "if", "when", "try", "while", "for", "block", "case", "proc", "iterator",
"converter", "macro", "template", "method", "func":
llStreamWrite(p.outp, spaces(p.indent))
llStreamWrite(p.outp, substr(p.x, d))
inc(p.indent, 2)
of "elif", "of", "else", "except", "finally":
llStreamWrite(p.outp, spaces(p.indent - 2))
llStreamWrite(p.outp, substr(p.x, d))
of "let", "var", "const", "type":
llStreamWrite(p.outp, spaces(p.indent))
llStreamWrite(p.outp, substr(p.x, d))
if not p.x.contains({':', '='}):
# no inline element --> treat as block:
inc(p.indent, 2)
else:
llStreamWrite(p.outp, spaces(p.indent))
llStreamWrite(p.outp, substr(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, spaces(p.indent + 2))
llStreamWrite(p.outp, "\"")
of psDirective:
newLine(p)
llStreamWrite(p.outp, spaces(p.indent))
llStreamWrite(p.outp, p.emit)
llStreamWrite(p.outp, "(\"")
inc(p.emitPar)
p.state = psTempl
while j < len:
case p.x[j]
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 Nim 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)
var curly = 0
while j < len:
case p.x[j]
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)
if curly > 0:
localError(p.config, p.info, "expected closing '}'")
break
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 j < len and 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.config, p.info, "invalid expression")
else:
llStreamWrite(p.outp, p.x[j])
inc(j)
llStreamWrite(p.outp, "\\n\"")
proc filterTmpl*(conf: ConfigRef, stdin: PLLStream, filename: AbsoluteFile,
call: PNode): PLLStream =
var p = TTmplParser(config: conf, info: newLineInfo(conf, filename, 0, 0),
outp: llStreamOpen(""), inp: stdin,
subsChar: charArg(conf, call, "subschar", 1, '$'),
nimDirective: charArg(conf, call, "metachar", 2, '#'),
emit: strArg(conf, call, "emit", 3, "result.add"),
conc: strArg(conf, call, "conc", 4, " & "),
toStr: strArg(conf, call, "tostring", 5, "$"),
x: newStringOfCap(120)
)
# do not process the first line which contains the directive:
if llStreamReadLine(p.inp, p.x):
inc p.info.line
while llStreamReadLine(p.inp, p.x):
inc p.info.line
parseLine(p)
newLine(p)
result = p.outp
llStreamClose(p.inp)
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