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/**

*

* @param input

* 输入字符串

* @param format

* 格式字符串

* @param export

* 输出

* @return

*/

public static boolean sscanf(String input, String format, @SuppressWarnings("rawtypes") Collection export) {

if (format.indexOf('%') < 0) {

return false;

}

// 分解格式

List subFormats = new ArrayList<>();

if (!resolveFormatString(subFormats, format)) {

return false;

}

// 解析输入

if (!resolveInputString(subFormats, format, export, input)) {

return false;

}

return true;

}

@SuppressWarnings("unchecked")

private static boolean resolveInputString(List subFormats, String format,

@SuppressWarnings("rawtypes") Collection export, String input) {

StringWriter writer = null;

for (int formatIndex = 0, inputIndex = 0; formatIndex < subFormats.size(); ++formatIndex) {

String subFormat = subFormats.get(formatIndex);

if ("%d".equals(subFormat) || "%l".equals(subFormat)) {

for (; inputIndex < input.length(); ++inputIndex) {

char c = input.charAt(inputIndex);

if ('9' < c || '0' > c) {

if (writer == null) {

continue;

} else {

break;

}

} else {

if (writer == null) {

writer = new StringWriter(input.length());

}

writer.append(c);

}

}

long integer = Long.parseLong(writer.toString());

writer = null;

export.add(integer);

} else if ("%f".equals(subFormat)) {

int dotCount = 0;

for (; inputIndex < input.length(); ++inputIndex) {

char c = input.charAt(inputIndex);

if (c == '.') {

++dotCount;

}

if (dotCount > 1) {

break;

}

if (('9' < c || '0' > c) && '.' != c) {

if (writer == null) {

continue;

} else {

break;

}

} else {

if (writer == null) {

writer = new StringWriter(input.length());

}

writer.append(c);

}

}

double integer = Double.parseDouble(writer.toString());

writer = null;

export.add(integer);

} else if ("%c".equals(subFormat)) {

char c = input.charAt(inputIndex);

export.add(c);

++inputIndex;

} else if ("%s".equals(subFormat)) {

if (formatIndex >= subFormats.size() - 1) {

export.add(input.substring(inputIndex));

inputIndex = input.length();

continue;

}

String subFormat2 = subFormats.get(formatIndex + 1);

if ("%d".equals(subFormat2) || "%l".equals(subFormat2)) {

for (; inputIndex < input.length(); ++inputIndex) {

char c = input.charAt(inputIndex);

if (writer == null) {

writer = new StringWriter(input.length());

}

if ('9' < c || '0' > c) {

writer.append(c);

} else {

break;

}

}

export.add(writer.toString());

writer = null;

} else if ("%f".equals(subFormat2)) {

for (; inputIndex < input.length(); ++inputIndex) {

char c = input.charAt(inputIndex);

if (writer == null) {

writer = new StringWriter(input.length());

}

if (('9' < c || '0' > c) && '.' != c) {

writer.append(c);

} else {

break;

}

}

export.add(writer.toString());

writer = null;

} else if ("%s".equals(subFormat2) || "%c".equals(subFormat2)) {

return false;

} else {

int nextInputIndex = input.indexOf(subFormat2, inputIndex);

String skipString = input.substring(inputIndex, nextInputIndex);

inputIndex = nextInputIndex + subFormat2.length();

export.add(skipString);

++formatIndex;

}

} else {

inputIndex = input.indexOf(subFormat, inputIndex) + subFormat.length();

}

}

return true;

}

private static boolean resolveFormatString(List subFormats, String format) {

// 分解格式

StringWriter writer = null;

for (int index = 0; index < format.length(); ++index) {

char c = format.charAt(index);

// 普通字符

if (c != '%') {

if (writer != null) {

subFormats.add(writer.toString());

}

writer = new StringWriter(format.length());

writer.append(c);

continue;

}

// 结束判定

if (index == format.length() - 1) {

writer.append(c);

break;

}

// 下一个字符

++index;

char c2 = format.charAt(index);

// 发现%

if (c2 == '%') {

writer.append(c);

continue;

}

// 格式判定

if ("dflsc".indexOf(c2) < 0) {

return false;

}

if (writer != null) {

subFormats.add(writer.toString());

}

writer = new StringWriter(format.length());

writer.append(c);

writer.append(c2);

}

if (writer != null) {

subFormats.add(writer.toString());

}

return true;

}