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fewer temporary string allocations for the compiler's renderer (#7484)

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Arne Döring
2018-04-04 08:46:35 +02:00
committed by Andreas Rumpf
parent f108e89670
commit abfcbaa74c
1 changed files with 20 additions and 15 deletions
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35
compiler/renderer.nim
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@@ -173,25 +173,30 @@ proc put(g: var TSrcGen, kind: TTokType, s: string) =
else:
g.pendingWhitespace = s.len
proc toNimChar(c: char): string =
proc addNimChar(dst: var string; c: char): void =
case c
of '\0': result = "\\x00" # not "\\0" to avoid ambiguous cases like "\\012".
of '\a': result = "\\a" # \x07
of '\b': result = "\\b" # \x08
of '\t': result = "\\t" # \x09
of '\L': result = "\\L" # \x0A
of '\v': result = "\\v" # \x0B
of '\f': result = "\\f" # \x0C
of '\c': result = "\\c" # \x0D
of '\e': result = "\\e" # \x1B
of '\0': dst.add "\\x00" # not "\\0" to avoid ambiguous cases like "\\012".
of '\a': dst.add "\\a" # \x07
of '\b': dst.add "\\b" # \x08
of '\t': dst.add "\\t" # \x09
of '\L': dst.add "\\L" # \x0A
of '\v': dst.add "\\v" # \x0B
of '\f': dst.add "\\f" # \x0C
of '\c': dst.add "\\c" # \x0D
of '\e': dst.add "\\e" # \x1B
of '\x01'..'\x06', '\x0E'..'\x1A', '\x1C'..'\x1F', '\x80'..'\xFF':
result = "\\x" & strutils.toHex(ord(c), 2)
of '\'', '\"', '\\': result = '\\' & c
else: result = c & ""
dst.add "\\x"
dst.add strutils.toHex(ord(c), 2)
of '\'', '\"', '\\':
dst.add '\\'
dst.add c
else:
dst.add c
proc makeNimString(s: string): string =
result = "\""
for i in countup(0, len(s)-1): add(result, toNimChar(s[i]))
for c in s:
result.addNimChar c
add(result, '\"')
proc putComment(g: var TSrcGen, s: string) =
@@ -364,7 +369,7 @@ proc atom(g: TSrcGen; n: PNode): string =
of nkStrLit: result = makeNimString(n.strVal)
of nkRStrLit: result = "r\"" & replace(n.strVal, "\"", "\"\"") & '\"'
of nkTripleStrLit: result = "\"\"\"" & n.strVal & "\"\"\""
of nkCharLit: result = '\'' & toNimChar(chr(int(n.intVal))) & '\''
of nkCharLit: result = "\'"; result.addNimChar chr(int(n.intVal)); result.add '\''
of nkIntLit: result = litAux(g, n, n.intVal, 4)
of nkInt8Lit: result = litAux(g, n, n.intVal, 1) & "\'i8"
of nkInt16Lit: result = litAux(g, n, n.intVal, 2) & "\'i16"