com.oracle.truffle.js.nodes.cast.JSTrimWhitespaceNode Maven / Gradle / Ivy

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 * The Universal Permissive License (UPL), Version 1.0
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 * person obtaining a copy of this software, associated documentation and/or
 * data (collectively the "Software"), free of charge and under any and all
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 * unmodified Software as contributed to or provided by such licensor, or (ii)
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 * (a) the Software, and
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 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
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package com.oracle.truffle.js.nodes.cast;

import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.GenerateUncached;
import com.oracle.truffle.api.dsl.Cached.Exclusive;
import com.oracle.truffle.api.dsl.Cached.Shared;
import com.oracle.truffle.api.dsl.NeverDefault;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.nodes.Node;
import com.oracle.truffle.api.profiles.InlinedBranchProfile;
import com.oracle.truffle.api.profiles.InlinedConditionProfile;
import com.oracle.truffle.api.strings.TruffleString;
import com.oracle.truffle.js.lang.JavaScriptLanguage;
import com.oracle.truffle.js.nodes.JavaScriptBaseNode;
import com.oracle.truffle.js.runtime.JSRuntime;
import com.oracle.truffle.js.runtime.Strings;

@GenerateUncached
public abstract class JSTrimWhitespaceNode extends JavaScriptBaseNode {

    @NeverDefault
    public static JSTrimWhitespaceNode create() {
        return JSTrimWhitespaceNodeGen.create();
    }

    public abstract TruffleString executeString(TruffleString operand);

    protected boolean startsOrEndsWithWhitespace(TruffleString.ReadCharUTF16Node readRawNode, TruffleString string,
                    InlinedConditionProfile isFastNonWhitespace, InlinedConditionProfile isFastWhitespace) {
        int len = Strings.length(string);
        assert len > 0;
        return isWhiteSpace(readRawNode, string, 0, this, isFastNonWhitespace, isFastWhitespace) ||
                        isWhiteSpace(readRawNode, string, len - 1, this, isFastNonWhitespace, isFastWhitespace);
    }

    @Specialization(guards = "stringLength(string) == 0")
    protected static TruffleString doStringZero(TruffleString string) {
        return string;
    }

    @Specialization(guards = {"stringLength(string) > 0", "!startsOrEndsWithWhitespace(readRawNode, string, isFastNonWhitespace, isFastWhitespace)"})
    protected static TruffleString doStringNoWhitespace(TruffleString string,
                    @Cached @SuppressWarnings("unused") @Shared TruffleString.ReadCharUTF16Node readRawNode,
                    @Cached @SuppressWarnings("unused") @Shared InlinedConditionProfile isFastNonWhitespace,
                    @Cached @SuppressWarnings("unused") @Shared InlinedConditionProfile isFastWhitespace) {
        return string;
    }

    @Specialization(guards = {"stringLength(string) > 0", "startsOrEndsWithWhitespace(readRawNode, string, isFastNonWhitespace, isFastWhitespace)"})
    protected final TruffleString doString(TruffleString string,
                    @Cached @Shared TruffleString.ReadCharUTF16Node readRawNode,
                    @Cached @Shared InlinedConditionProfile isFastNonWhitespace,
                    @Cached @Shared InlinedConditionProfile isFastWhitespace,
                    @Cached TruffleString.SubstringByteIndexNode substringNode,
                    @Cached InlinedBranchProfile startsWithWhitespaceBranch,
                    @Cached InlinedBranchProfile endsWithWhitespaceBranch,
                    @Cached @Exclusive InlinedConditionProfile isEmpty) {
        int len = Strings.length(string);
        int firstIdx = 0;
        if (isWhiteSpace(readRawNode, string, 0, this, isFastNonWhitespace, isFastWhitespace)) {
            startsWithWhitespaceBranch.enter(this);
            firstIdx = JSRuntime.firstNonWhitespaceIndex(string, readRawNode);
        }
        int lastIdx = len - 1;
        if (isWhiteSpace(readRawNode, string, len - 1, this, isFastNonWhitespace, isFastWhitespace)) {
            endsWithWhitespaceBranch.enter(this);
            lastIdx = JSRuntime.lastNonWhitespaceIndex(string, readRawNode);
        }
        if (isEmpty.profile(this, firstIdx > lastIdx)) {
            return Strings.EMPTY_STRING;
        } else {
            return Strings.substring(JavaScriptLanguage.get(this).getJSContext(), substringNode, string, firstIdx, lastIdx + 1 - firstIdx);
        }
    }

    private static boolean isWhiteSpace(TruffleString.ReadCharUTF16Node readRawNode, TruffleString str, int index,
                    Node node, InlinedConditionProfile isFastNonWhitespace, InlinedConditionProfile isFastWhitespace) {
        char c = Strings.charAt(readRawNode, str, index);
        if (isFastNonWhitespace.profile(node, 0x0020 < c && c < 0x00A0)) {
            return false;
        } else if (isFastWhitespace.profile(node, c == ' ' || c == '\n' || c == '\r' || c == '\t')) {
            return true;
        } else {
            return JSRuntime.isWhiteSpaceOrLineTerminator(c);
        }
    }
}