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Copy pathStringFormatSpec.cs
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341 lines (300 loc) · 11.5 KB
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/* ****************************************************************************
*
* Copyright (c) Microsoft Corporation.
*
* This source code is subject to terms and conditions of the Apache License, Version 2.0. A
* copy of the license can be found in the License.html file at the root of this distribution. If
* you cannot locate the Apache License, Version 2.0, please send an email to
* dlr@microsoft.com. By using this source code in any fashion, you are agreeing to be bound
* by the terms of the Apache License, Version 2.0.
*
* You must not remove this notice, or any other, from this software.
*
*
* ***************************************************************************/
using System;
using System.Collections.Generic;
using System.Text;
using System.Diagnostics;
using Microsoft.Scripting;
using Microsoft.Scripting.Runtime;
using Microsoft.Scripting.Utils;
using IronPython.Runtime.Operations;
namespace IronPython.Runtime {
/// <summary>
/// Provides a representation and parsing for the default formatting specification. This is used
/// by object.__format__, int.__format__, long.__format__, and float.__format__ to do the common
/// format spec parsing.
///
/// The default specification is:
///
/// format_spec = [[fill]align][sign][#][0][width][,][.precision][type]
/// fill = a character other than }
/// align = "<" | ">" | "=" | "^"
/// sign = "+" | "-" | " "
/// width = integer
/// precision = integer
/// type = "b" | "c" | "d" | "e" | "E" | "f" | "F" | "g" | "G" | "n" | "o" | "x" | "X" | "%"
/// </summary>
internal class StringFormatSpec {
internal readonly char? Fill, Alignment, Sign, Type;
internal readonly int? Width, Precision;
internal readonly bool IncludeType, ThousandsComma;
private StringFormatSpec(char? fill, char? alignment, char? sign, int? width, bool thousandsComma, int? precision, char? type, bool includeType) {
Fill = fill;
Alignment = alignment;
Sign = sign;
Width = width;
ThousandsComma = thousandsComma;
Precision = precision;
Type = type;
IncludeType = includeType;
}
/// <summary>
/// Parses a format spec and returns a new StringFormatSpec object.
/// </summary>
internal static StringFormatSpec/*!*/ FromString(string/*!*/ formatSpec) {
Assert.NotNull(formatSpec);
char? fill = null, sign = null, align = null, type = null;
int? width = null, precision = null;
bool includeType = false, thousandsComma = false;
int curOffset = 0;
if (formatSpec.Length >= 2) {
// check 2nd character for alignment first, then 1st character
switch (formatSpec[1]) {
case '<':
case '>':
case '=':
case '^':
fill = formatSpec[0];
if (fill == Char.MinValue) {
fill = ' ';
}
align = formatSpec[1];
curOffset = 2;
break;
default:
switch (formatSpec[0]) {
case '<':
case '>':
case '=':
case '^':
align = formatSpec[0];
curOffset = 1;
break;
}
break;
}
}
// read sign
if (curOffset != formatSpec.Length &&
(formatSpec[curOffset] == '+' ||
formatSpec[curOffset] == '-' ||
formatSpec[curOffset] == ' ')) {
sign = formatSpec[curOffset++];
}
// include 0b, 0x, etc...
if (curOffset != formatSpec.Length &&
formatSpec[curOffset] == '#') {
includeType = true;
curOffset++;
}
// zero padding
if (curOffset != formatSpec.Length &&
formatSpec[curOffset] == '0') {
if (align == null) {
align = '=';
}
if (fill == null) {
fill = '0';
}
curOffset++;
}
// read width
if (curOffset != formatSpec.Length &&
Char.IsDigit(formatSpec[curOffset])) {
width = ParseInt(formatSpec, ref curOffset);
}
// read optional comma
if (curOffset != formatSpec.Length &&
formatSpec[curOffset] == ',') {
curOffset++;
thousandsComma = true;
}
// read precision
if (curOffset != formatSpec.Length &&
formatSpec[curOffset] == '.') {
curOffset++;
if (curOffset == formatSpec.Length ||
!Char.IsDigit(formatSpec[curOffset])) {
throw PythonOps.ValueError("Format specifier missing precision");
}
precision = ParseInt(formatSpec, ref curOffset);
}
// read type
if (curOffset != formatSpec.Length) {
type = formatSpec[curOffset++];
if (thousandsComma) {
switch (type) {
case 'b':
case 'c':
case 'n':
case 'o':
case 'x':
case 'X':
throw PythonOps.ValueError("Cannot specify ',' with '{0}'", type);
}
}
}
return new StringFormatSpec(
fill,
align,
sign,
width,
thousandsComma,
precision,
type,
includeType
);
}
internal string/*!*/ AlignText(string/*!*/ text) {
Assert.NotNull(text);
if (Width != null) {
int width = Width.Value;
if (text.Length < width) {
char fill = Fill ?? ' ';
int headerLen = 0, footerLen = 0;
int fillLength = width - text.Length;
switch (Alignment) {
case null:
case '<': footerLen = fillLength; break;
case '=':
case '>': headerLen = fillLength; break;
case '^':
headerLen = footerLen = fillLength / 2;
if ((fillLength & 0x01) != 0) {
footerLen++;
}
break;
}
if (headerLen != 0) {
text = new string(fill, headerLen) + text;
}
if (footerLen != 0) {
text = text + new string(fill, footerLen);
}
}
}
return text;
}
internal string/*!*/ AlignNumericText(string/*!*/ text, bool isZero, bool isPos) {
Assert.NotNull(text);
char? sign = GetSign(isZero, isPos);
string type = GetTypeString();
if (Width != null) {
int width = Width.Value;
if (text.Length < width) {
char fill = Fill ?? ' ';
int headerLen = 0, footerLen = 0;
int fillLength = width - text.Length;
if (sign != null) {
fillLength--;
}
if (type != null) {
fillLength -= type.Length;
}
if (Alignment != '=' && sign != null) {
text = sign.Value + type + text;
sign = null;
type = null;
}
switch (Alignment) {
case '<': footerLen = fillLength; break;
case '=': headerLen = fillLength; break;
case null:
case '>': headerLen = fillLength; break;
case '^':
headerLen = footerLen = fillLength / 2;
if ((fillLength & 0x01) != 0) {
footerLen++;
}
break;
}
if (headerLen != 0) {
string ssign = sign.HasValue ? sign.Value.ToString() : "";
text = ssign + type + new string(fill, headerLen) + text;
} else {
if (sign != null) {
text = sign.Value + text;
}
if (type != null) {
text = type + text;
}
}
if (footerLen != 0) {
text = text + new string(fill, footerLen);
}
} else {
text = FinishText(text, sign, type);
}
} else {
text = FinishText(text, sign, type);
}
return text;
}
private static string FinishText(string text, char? sign, string type) {
if (sign != null) {
text = sign.Value + type + text;
} else if (type != null) {
text = type + text;
}
return text;
}
private string GetTypeString() {
string type = null;
if (IncludeType) {
switch (Type) {
case 'X': type = "0X"; break;
case 'x': type = "0x"; break;
case 'o': type = "0o"; break;
case 'b': type = "0b"; break;
}
}
return type;
}
private char? GetSign(bool isZero, bool isPos) {
switch (Sign) {
case ' ':
if (isPos || isZero) {
return ' ';
} else {
return '-';
}
case '+':
if (isPos || isZero) {
return '+';
} else {
return '-';
}
default:
case '-':
if (!isPos && !isZero) {
return '-';
}
break;
}
return null;
}
private static int? ParseInt(string/*!*/ formatSpec, ref int curOffset) {
int? value = null;
int start = curOffset;
do {
curOffset++;
} while (curOffset < formatSpec.Length && Char.IsDigit(formatSpec[curOffset]));
if (start != curOffset) {
value = Int32.Parse(formatSpec.Substring(start, curOffset - start));
}
return value;
}
}
}
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