From c82e3b3b2de0633317ec8fc85925e91422820597 Mon Sep 17 00:00:00 2001 From: "Benjamin J. Culkin" Date: Sun, 8 Oct 2017 22:39:59 -0300 Subject: Start splitting into maven modules --- .../java/bjc/utils/parserutils/DoubleMatcher.java | 46 ++++++++++++++++++++++ 1 file changed, 46 insertions(+) create mode 100644 base/src/main/java/bjc/utils/parserutils/DoubleMatcher.java (limited to 'base/src/main/java/bjc/utils/parserutils/DoubleMatcher.java') diff --git a/base/src/main/java/bjc/utils/parserutils/DoubleMatcher.java b/base/src/main/java/bjc/utils/parserutils/DoubleMatcher.java new file mode 100644 index 0000000..a885808 --- /dev/null +++ b/base/src/main/java/bjc/utils/parserutils/DoubleMatcher.java @@ -0,0 +1,46 @@ +package bjc.utils.parserutils; + +import static bjc.utils.PropertyDB.applyFormat; +import static bjc.utils.PropertyDB.getRegex; + +import java.util.regex.Pattern; + +/* + * Checks if a string would pass Double.parseDouble. + * + * Uses a regex from the javadoc for Double.valueOf() + */ +class DoubleMatcher { + /* + * Unit pieces. + */ + private static final String rDecDigits = getRegex("fpDigits"); + private static final String rHexDigits = getRegex("fpHexDigits"); + private static final String rExponent = applyFormat("fpExponent", getRegex("fpExponent"), rDecDigits); + + /* + * Decimal floating point numbers. + */ + private static final String rSimpleDec = applyFormat("fpDecimalDecimal", rDecDigits, rExponent); + private static final String rSimpleIntDec = applyFormat("fpDecimalInteger", rDecDigits, rExponent); + + /* + * Hex floating point numbers. + */ + private static final String rHexInt = applyFormat("fpHexInteger", rHexDigits); + private static final String rHexDec = applyFormat("fpHexDecimal", rHexDigits); + private static final String rHexLead = applyFormat("fpHexLeader", rHexInt, rHexDec); + private static final String rHexString = applyFormat("fpHexString", rHexLead, rDecDigits); + + /* + * Floating point components. + */ + private static final String rFPLeader = getRegex("fpLeader"); + private static final String rFPNum = applyFormat("fpNumber", rSimpleIntDec, rSimpleDec, rHexString); + + /* + * Full double. + */ + private static final String rDouble = applyFormat("fpDouble", rFPLeader, rFPNum); + public static final Pattern doubleLiteral = Pattern.compile("\\A" + rDouble + "\\Z"); +} -- cgit v1.2.3