clarify that `char` may not be unsigned (#20308) - Nim - This repository contains the Nim compiler, Nim's stdlib, tools, and documentation. (mirror)

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author	ringabout <43030857+ringabout@users.noreply.github.com>	2022-09-07 05:06:32 +0800
committer	GitHub <noreply@github.com>	2022-09-06 23:06:32 +0200
commit	f433d9cccf1a05da1a24e9fed9b914b7a2a35945 (patch)
tree	ad4fef812e304f5adcce5c07e8475eed5024f7cf /lib/std/varints.nim
parent	b2c5f6f3c8a8d3e5b9f908353f3ea791cc771385 (diff)
download	Nim-f433d9cccf1a05da1a24e9fed9b914b7a2a35945.tar.gz

clarify that `char` may not be unsigned (#20308)

Diffstat (limited to 'lib/std/varints.nim')

0 files changed, 0 insertions, 0 deletions

# # # 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, pbraces, filters, filter_tmpl, renderer type TFilterKind* = enum filtNone, filtTemplate, filtReplace, filtStrip TParserKind* = enum skinStandard, skinStrongSpaces, skinBraces, skinEndX const parserNames*: array[TParserKind, string] = ["standard", "strongspaces", "braces", "endx"] filterNames*: array[TFilterKind, string] = ["none", "stdtmpl", "replace", "strip"] type TParsers*{.final.} = object skin*: TParserKind parser*: TParser proc parseFile*(fileIdx: int32): PNode{.procvar.} proc openParsers*(p: var TParsers, fileIdx: int32, inputstream: PLLStream) proc closeParsers*(p: var TParsers) proc parseAll*(p: var TParsers): PNode proc parseTopLevelStmt*(p: var TParsers): PNode # implements an iterator. Returns the next top-level statement or nil if end # of stream. # implementation proc parseFile(fileIdx: int32): PNode = var p: TParsers f: File let filename = fileIdx.toFullPathConsiderDirty if not open(f, filename): rawMessage(errCannotOpenFile, filename) return openParsers(p, fileIdx, llStreamOpen(f)) result = parseAll(p) closeParsers(p) proc parseAll(p: var TParsers): PNode = case p.skin of skinStandard, skinStrongSpaces: result = parser.parseAll(p.parser) of skinBraces: result = pbraces.parseAll(p.parser) of skinEndX: internalError("parser to implement") result = ast.emptyNode proc parseTopLevelStmt(p: var TParsers): PNode = case p.skin of skinStandard, skinStrongSpaces: result = parser.parseTopLevelStmt(p.parser) of skinBraces: result = pbraces.parseTopLevelStmt(p.parser) of skinEndX: internalError("parser to implement") result = ast.emptyNode proc utf8Bom(s: string): int = if (s[0] == '\xEF') and (s[1] == '\xBB') and (s[2] == '\xBF'): result = 3 else: result = 0 proc containsShebang(s: string, i: int): bool = if (s[i] == '#') and (s[i + 1] == '!'): var j = i + 2 while s[j] in Whitespace: inc(j) result = s[j] == '/' proc parsePipe(filename: string, inputStream: PLLStream): PNode = result = ast.emptyNode 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 line[i] == '#' and line[i+1] == '?': inc(i, 2) while line[i] in Whitespace: inc(i) var q: TParser openParser(q, filename, llStreamOpen(substr(line, i))) result = parser.parseAll(q) closeParser(q) llStreamClose(s) proc getFilter(ident: PIdent): TFilterKind = for i in countup(low(TFilterKind), high(TFilterKind)): if identEq(ident, filterNames[i]): return i result = filtNone proc getParser(ident: PIdent): TParserKind = for i in countup(low(TParserKind), high(TParserKind)): if identEq(ident, parserNames[i]): return i rawMessage(errInvalidDirectiveX, ident.s) proc getCallee(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: rawMessage(errXNotAllowedHere, renderTree(n)) proc applyFilter(p: var TParsers, n: PNode, filename: string, stdin: PLLStream): PLLStream = var ident = getCallee(n) var f = getFilter(ident) case f of filtNone: p.skin = getParser(ident) result = stdin of filtTemplate: result = filterTmpl(stdin, filename, n) of filtStrip: result = filterStrip(stdin, filename, n) of filtReplace: result = filterReplace(stdin, filename, n) if f != filtNone: if hintCodeBegin in gNotes: rawMessage(hintCodeBegin, []) msgWriteln(result.s) rawMessage(hintCodeEnd, []) proc evalPipe(p: var TParsers, n: PNode, filename: string, start: PLLStream): PLLStream = result = start if n.kind == nkEmpty: return if n.kind == nkInfix and n.sons[0].kind == nkIdent and identEq(n.sons[0].ident, "|"): 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: int32, inputstream: PLLStream) = var s: PLLStream p.skin = skinStandard let filename = fileIdx.toFullPathConsiderDirty var pipe = parsePipe(filename, inputstream) if pipe != nil: s = evalPipe(p, pipe, filename, inputstream) else: s = inputstream case p.skin of skinStandard, skinBraces, skinEndX: parser.openParser(p.parser, fileIdx, s, false) of skinStrongSpaces: parser.openParser(p.parser, fileIdx, s, true) proc closeParsers(p: var TParsers) = parser.closeParser(p.parser)


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