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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.
#
## Implements the dispatcher for the different parsers.
import
strutils, llstream, ast, astalgo, idents, lexer, options, msgs, parser,
filters, filter_tmpl, renderer, lineinfos, pathutils
type
TFilterKind* = enum
filtNone, filtTemplate, filtReplace, filtStrip
TParserKind* = enum
skinStandard, skinEndX
const
parserNames*: array[TParserKind, string] = ["standard",
"endx"]
filterNames*: array[TFilterKind, string] = ["none", "stdtmpl", "replace",
"strip"]
type
TParsers* = object
skin*: TParserKind
parser*: TParser
template config(p: TParsers): ConfigRef = p.parser.lex.config
proc parseAll*(p: var TParsers): PNode =
case p.skin
of skinStandard:
result = parser.parseAll(p.parser)
of skinEndX:
internalError(p.config, "parser to implement")
proc parseTopLevelStmt*(p: var TParsers): PNode =
case p.skin
of skinStandard:
result = parser.parseTopLevelStmt(p.parser)
of skinEndX:
internalError(p.config, "parser to implement")
proc utf8Bom(s: string): int =
if s.len >= 3 and s[0] == '\xEF' and s[1] == '\xBB' and s[2] == '\xBF':
result = 3
else:
result = 0
proc containsShebang(s: string, i: int): bool =
if i+1 < s.len and s[i] == '#' and s[i+1] == '!':
var j = i + 2
while j < s.len and s[j] in Whitespace: inc(j)
result = s[j] == '/'
proc parsePipe(filename: AbsoluteFile, inputStream: PLLStream; cache: IdentCache;
config: ConfigRef): PNode =
result = newNode(nkEmpty)
var s = llStreamOpen(filename, fmRead)
if s != nil:
var line = newStringOfCap(80)
discard llStreamReadLine(s, line)
var i = utf8Bom(line)
var linenumber = 1
if containsShebang(line, i):
discard llStreamReadLine(s, line)
i = 0
inc linenumber
if i+1 < line.len and line[i] == '#' and line[i+1] == '?':
when defined(nimpretty2):
# XXX this is a bit hacky, but oh well...
quit "can't nimpretty a source code filter"
else:
inc(i, 2)
while i < line.len and line[i] in Whitespace: inc(i)
var q: TParser
parser.openParser(q, filename, llStreamOpen(substr(line, i)), cache, config)
result = parser.parseAll(q)
parser.closeParser(q)
llStreamClose(s)
proc getFilter(ident: PIdent): TFilterKind =
for i in countup(low(TFilterKind), high(TFilterKind)):
if cmpIgnoreStyle(ident.s, filterNames[i]) == 0:
return i
result = filtNone
proc getParser(conf: ConfigRef; n: PNode; ident: PIdent): TParserKind =
for i in countup(low(TParserKind), high(TParserKind)):
if cmpIgnoreStyle(ident.s, parserNames[i]) == 0:
return i
localError(conf, n.info, "unknown parser: " & ident.s)
proc getCallee(conf: ConfigRef; n: PNode): PIdent =
if n.kind in nkCallKinds and n.sons[0].kind == nkIdent:
result = n.sons[0].ident
elif n.kind == nkIdent:
result = n.ident
else:
localError(conf, n.info, "invalid filter: " & renderTree(n))
proc applyFilter(p: var TParsers, n: PNode, filename: AbsoluteFile,
stdin: PLLStream): PLLStream =
var ident = getCallee(p.config, n)
var f = getFilter(ident)
case f
of filtNone:
p.skin = getParser(p.config, n, ident)
result = stdin
of filtTemplate:
result = filterTmpl(stdin, filename, n, p.config)
of filtStrip:
result = filterStrip(p.config, stdin, filename, n)
of filtReplace:
result = filterReplace(p.config, stdin, filename, n)
if f != filtNone:
assert p.config != nil
if hintCodeBegin in p.config.notes:
rawMessage(p.config, hintCodeBegin, [])
msgWriteln(p.config, result.s)
rawMessage(p.config, hintCodeEnd, [])
proc evalPipe(p: var TParsers, n: PNode, filename: AbsoluteFile,
start: PLLStream): PLLStream =
assert p.config != nil
result = start
if n.kind == nkEmpty: return
if n.kind == nkInfix and n[0].kind == nkIdent and n[0].ident.s == "|":
for i in countup(1, 2):
if n.sons[i].kind == nkInfix:
result = evalPipe(p, n.sons[i], filename, result)
else:
result = applyFilter(p, n.sons[i], filename, result)
elif n.kind == nkStmtList:
result = evalPipe(p, n.sons[0], filename, result)
else:
result = applyFilter(p, n, filename, result)
proc openParsers*(p: var TParsers, fileIdx: FileIndex, inputstream: PLLStream;
cache: IdentCache; config: ConfigRef) =
assert config != nil
var s: PLLStream
p.skin = skinStandard
let filename = toFullPathConsiderDirty(config, fileIdx)
var pipe = parsePipe(filename, inputstream, cache, config)
p.config() = config
if pipe != nil: s = evalPipe(p, pipe, filename, inputstream)
else: s = inputstream
case p.skin
of skinStandard, skinEndX:
parser.openParser(p.parser, fileIdx, s, cache, config)
proc closeParsers*(p: var TParsers) =
parser.closeParser(p.parser)
proc setupParsers*(p: var TParsers; fileIdx: FileIndex; cache: IdentCache;
config: ConfigRef): bool =
var f: File
let filename = toFullPathConsiderDirty(config, fileIdx)
if not open(f, filename.string):
rawMessage(config, errGenerated, "cannot open file: " & filename.string)
return false
openParsers(p, fileIdx, llStreamOpen(f), cache, config)
result = true
proc parseFile*(fileIdx: FileIndex; cache: IdentCache; config: ConfigRef): PNode {.procvar.} =
var p: TParsers
if setupParsers(p, fileIdx, cache, config):
result = parseAll(p)
closeParsers(p)
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