Files
Nim/compiler/filters.nim
Adam Strzelecki d681812465 compiler: Trim .nim files trailing whitespace
via OSX: find . -name '*.nim' -exec sed -i '' -E 's/[[:space:]]+$//' {} +
2015-09-04 23:03:22 +02:00

80 lines
2.8 KiB
Nim

#
#
# 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 simple filters and helpers for filters.
import
llstream, os, wordrecg, idents, strutils, ast, astalgo, msgs, options,
renderer
proc filterReplace*(stdin: PLLStream, filename: string, call: PNode): PLLStream
proc filterStrip*(stdin: PLLStream, filename: string, call: PNode): PLLStream
# helpers to retrieve arguments:
proc charArg*(n: PNode, name: string, pos: int, default: char): char
proc strArg*(n: PNode, name: string, pos: int, default: string): string
proc boolArg*(n: PNode, name: string, pos: int, default: bool): bool
# implementation
proc invalidPragma(n: PNode) =
localError(n.info, errXNotAllowedHere, renderTree(n, {renderNoComments}))
proc getArg(n: PNode, name: string, pos: int): PNode =
result = nil
if n.kind in {nkEmpty..nkNilLit}: return
for i in countup(1, sonsLen(n) - 1):
if n.sons[i].kind == nkExprEqExpr:
if n.sons[i].sons[0].kind != nkIdent: invalidPragma(n)
if identEq(n.sons[i].sons[0].ident, name):
return n.sons[i].sons[1]
elif i == pos:
return n.sons[i]
proc charArg(n: PNode, name: string, pos: int, default: char): char =
var x = getArg(n, name, pos)
if x == nil: result = default
elif x.kind == nkCharLit: result = chr(int(x.intVal))
else: invalidPragma(n)
proc strArg(n: PNode, name: string, pos: int, default: string): string =
var x = getArg(n, name, pos)
if x == nil: result = default
elif x.kind in {nkStrLit..nkTripleStrLit}: result = x.strVal
else: invalidPragma(n)
proc boolArg(n: PNode, name: string, pos: int, default: bool): bool =
var x = getArg(n, name, pos)
if x == nil: result = default
elif (x.kind == nkIdent) and identEq(x.ident, "true"): result = true
elif (x.kind == nkIdent) and identEq(x.ident, "false"): result = false
else: invalidPragma(n)
proc filterStrip(stdin: PLLStream, filename: string, call: PNode): PLLStream =
var pattern = strArg(call, "startswith", 1, "")
var leading = boolArg(call, "leading", 2, true)
var trailing = boolArg(call, "trailing", 3, true)
result = llStreamOpen("")
var line = newStringOfCap(80)
while llStreamReadLine(stdin, line):
var stripped = strip(line, leading, trailing)
if (len(pattern) == 0) or startsWith(stripped, pattern):
llStreamWriteln(result, stripped)
else:
llStreamWriteln(result, line)
llStreamClose(stdin)
proc filterReplace(stdin: PLLStream, filename: string, call: PNode): PLLStream =
var sub = strArg(call, "sub", 1, "")
if len(sub) == 0: invalidPragma(call)
var by = strArg(call, "by", 2, "")
result = llStreamOpen("")
var line = newStringOfCap(80)
while llStreamReadLine(stdin, line):
llStreamWriteln(result, replace(line, sub, by))
llStreamClose(stdin)