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73 lines
2.7 KiB
Nim
73 lines
2.7 KiB
Nim
#
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#
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# The Nim Compiler
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# (c) Copyright 2012 Andreas Rumpf
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#
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# See the file "copying.txt", included in this
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# distribution, for details about the copyright.
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#
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# This module implements Nim's simple filters and helpers for filters.
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import
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llstream, os, wordrecg, idents, strutils, ast, astalgo, msgs, options,
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renderer, pathutils
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proc invalidPragma(conf: ConfigRef; n: PNode) =
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localError(conf, n.info,
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"'$1' not allowed here" % renderTree(n, {renderNoComments}))
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proc getArg(conf: ConfigRef; n: PNode, name: string, pos: int): PNode =
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result = nil
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if n.kind in {nkEmpty..nkNilLit}: return
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for i in countup(1, sonsLen(n) - 1):
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if n.sons[i].kind == nkExprEqExpr:
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if n.sons[i].sons[0].kind != nkIdent: invalidPragma(conf, n)
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if cmpIgnoreStyle(n.sons[i].sons[0].ident.s, name) == 0:
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return n.sons[i].sons[1]
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elif i == pos:
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return n.sons[i]
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proc charArg*(conf: ConfigRef; n: PNode, name: string, pos: int, default: char): char =
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var x = getArg(conf, n, name, pos)
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if x == nil: result = default
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elif x.kind == nkCharLit: result = chr(int(x.intVal))
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else: invalidPragma(conf, n)
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proc strArg*(conf: ConfigRef; n: PNode, name: string, pos: int, default: string): string =
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var x = getArg(conf, n, name, pos)
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if x == nil: result = default
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elif x.kind in {nkStrLit..nkTripleStrLit}: result = x.strVal
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else: invalidPragma(conf, n)
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proc boolArg*(conf: ConfigRef; n: PNode, name: string, pos: int, default: bool): bool =
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var x = getArg(conf, n, name, pos)
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if x == nil: result = default
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elif x.kind == nkIdent and cmpIgnoreStyle(x.ident.s, "true") == 0: result = true
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elif x.kind == nkIdent and cmpIgnoreStyle(x.ident.s, "false") == 0: result = false
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else: invalidPragma(conf, n)
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proc filterStrip*(conf: ConfigRef; stdin: PLLStream, filename: AbsoluteFile, call: PNode): PLLStream =
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var pattern = strArg(conf, call, "startswith", 1, "")
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var leading = boolArg(conf, call, "leading", 2, true)
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var trailing = boolArg(conf, call, "trailing", 3, true)
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result = llStreamOpen("")
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var line = newStringOfCap(80)
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while llStreamReadLine(stdin, line):
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var stripped = strip(line, leading, trailing)
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if len(pattern) == 0 or startsWith(stripped, pattern):
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llStreamWriteln(result, stripped)
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else:
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llStreamWriteln(result, line)
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llStreamClose(stdin)
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proc filterReplace*(conf: ConfigRef; stdin: PLLStream, filename: AbsoluteFile, call: PNode): PLLStream =
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var sub = strArg(conf, call, "sub", 1, "")
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if len(sub) == 0: invalidPragma(conf, call)
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var by = strArg(conf, call, "by", 2, "")
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result = llStreamOpen("")
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var line = newStringOfCap(80)
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while llStreamReadLine(stdin, line):
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llStreamWriteln(result, replace(line, sub, by))
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llStreamClose(stdin)
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