VuoCodeHighlighterGLSL.cc

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#include "VuoCodeHighlighterGLSL.hh"
 
#include "VuoCodeEditor.hh"
 
VuoCodeHighlighterGLSL::VuoCodeHighlighterGLSL(QTextDocument *parent, VuoCodeEditor *codeEditor)
    : QSyntaxHighlighter(parent), codeEditor(codeEditor)
{
}
 
void VuoCodeHighlighterGLSL::highlightBlock(const QString &text)
{
    // From https://www.khronos.org/registry/OpenGL/specs/gl/GLSLangSpec.1.20.pdf
 
    // Keywords
    {
        QTextCharFormat format;
        format.setFontWeight(QFont::Bold);
        format.setFontItalic(true);
        format.setForeground(codeEditor->keywordColor);
 
        QRegularExpression expression("\\b(attribute|const|uniform|varying|centroid|break|continue|do|for|while|if|else|in|out|inout|float|int|void|bool|true|false|invariant|discard|return|mat[234]|mat[234]x[234]|[ib]?vec[234]|sampler[123]D|samplerCube|sampler[12]DShadow|struct)\\b");
        QRegularExpressionMatchIterator i = expression.globalMatch(text);
        while (i.hasNext())
        {
            QRegularExpressionMatch match = i.next();
            setFormat(match.capturedStart(), match.capturedLength(), format);
        }
    }
 
    // Built-in variables
    {
        QTextCharFormat format;
        format.setFontWeight(QFont::Bold);
        format.setForeground(codeEditor->builtinVariableColor);
 
        QRegularExpression expression("\\bgl_(BackColor|BackLightModelProduct|BackLightProduct|BackMaterial|BackSecondaryColor|ClipPlane|ClipVertex|Color|Color|DepthRange|DepthRangeParameters|DepthRangeParameters\\.diff|DepthRangeParameters\\.far|DepthRangeParameters\\.near|EyePlaneQ|EyePlaneR|EyePlaneS|EyePlaneT|Fog|FogCoord|FogFragCoord|FogFragCoord|FogParameters|FogParameters\\.color|FogParameters\\.density|FogParameters\\.end|FogParameters\\.scale|FogParameters\\.start|FragColor|FragCoord|FragData|FragDepth|FrontColor|FrontFacing|FrontLightModelProduct|FrontLightProduct|FrontMaterial|FrontSecondaryColor|LightModel|LightModelParameters|LightModelParameters\\.ambient|LightModelProducts|LightModelProducts\\.sceneColor|LightProducts|LightProducts\\.ambient|LightProducts\\.diffuse|LightProducts\\.specular|LightSource|LightSourceParameters|LightSourceParameters\\.ambient|LightSourceParameters\\.antAttenuation|LightSourceParameters\\.diffuse|LightSourceParameters\\.halfVector|LightSourceParameters\\.linearAttenuation|LightSourceParameters\\.position|LightSourceParameters\\.quadraticAttenuation|LightSourceParameters\\.specular|LightSourceParameters\\.spotCosCutoff|LightSourceParameters\\.spotCutoff|LightSourceParameters\\.spotDirection|LightSourceParameters\\.spotExponent|MaterialParameters|MaterialParameters\\.ambient|MaterialParameters\\.diffuse|MaterialParameters\\.emission|MaterialParameters\\.shininess|MaterialParameters\\.specular|MaxClipPlanes|MaxCombinedTextureImageUnits|MaxDrawBuffers|MaxFragmentComponents|MaxLights|MaxTextureCoords|MaxTextureImageUnits|MaxTextureUnits|MaxVaryingFloats|MaxVertexAttribs|MaxVertexTextureImageUnits|MaxVertexUniformComponents|ModelViewMatrix|ModelViewMatrixInverse|ModelViewMatrixInverseTranspose|ModelViewMatrixTranspose|ModelViewProjectionMatrix|ModelViewProjectionMatrixInverse|ModelViewProjectionMatrixInverseTranspose|ModelViewProjectionMatrixTranspose|MultiTexCoord0|MultiTexCoord1|MultiTexCoord2|MultiTexCoord3|MultiTexCoord4|MultiTexCoord5|MultiTexCoord6|MultiTexCoord7|Normal|NormalMatrix|NormalScale|ObjectPlaneQ|ObjectPlaneR|ObjectPlaneS|ObjectPlaneT|PoSize|Point|PointCoord|PointParameters|PointParameters\\.distanceLinearAttenuation|PointParameters\\.distanceQuadraticAttenuation|PointParameters\\.distanceantAttenuation|PointParameters\\.fadeThresholdSize|PointParameters\\.size|PointParameters\\.sizeMax|PointParameters\\.sizeMin|Position|ProjectionMatrix|ProjectionMatrixInverse|ProjectionMatrixInverseTranspose|ProjectionMatrixTranspose|SecondaryColor|SecondaryColor|TexCoord|TexCoord|TextureEnvColor|TextureMatrix|TextureMatrixInverse|TextureMatrixInverseTranspose|TextureMatrixTranspose|Vertex)\\b");
        QRegularExpressionMatchIterator i = expression.globalMatch(text);
        while (i.hasNext())
        {
            QRegularExpressionMatch match = i.next();
            setFormat(match.capturedStart(), match.capturedLength(), format);
        }
    }
 
    // Built-in functions
    {
        QTextCharFormat format;
        format.setFontWeight(QFont::Bold);
        format.setForeground(codeEditor->builtinFunctionColor);
 
        QRegularExpression expression("\\b(abs|acos|all|any|asin|atan|ceil|clamp|cos|cross|dFdx|dFdy|degrees|distance|dot|equal|exp|exp2|faceforward|floor|fract|ftransform|fwidth|greaterThan|greaterThanEqual|inversesqrt|length|lessThan|lessThanEqual|log|log2|matrixCompMult|max|min|mix|mod|noise1|noise2|noise3|noise4|normalize|not|notEqual|outerProduct|pow|radians|reflect|refract|shadow1D|shadow1DLod|shadow1DProj|shadow1DProjLod|shadow2D|shadow2DLod|shadow2DProj|shadow2DProjLod|sign|sin|smoothstep|sqrt|step|tan|texture1D|texture1DLod|texture1DProj|texture1DProjLod|texture2D|texture2DLod|texture2DProj|texture2DProjLod|texture3D|texture3DLod|texture3DProj|texture3DProjLod|textureCube|textureCubeLod|transpose)\\b");
        QRegularExpressionMatchIterator i = expression.globalMatch(text);
        while (i.hasNext())
        {
            QRegularExpressionMatch match = i.next();
            setFormat(match.capturedStart(), match.capturedLength(), format);
        }
    }
 
    // Operators and other punctuation
    {
        QTextCharFormat format;
        format.setFontWeight(QFont::Bold);
        format.setForeground(codeEditor->operatorColor);
 
        QRegularExpression expression("[{}\\[\\]()+\\-~!*/%<>&^=;|.,]");
        QRegularExpressionMatchIterator i = expression.globalMatch(text);
        while (i.hasNext())
        {
            QRegularExpressionMatch match = i.next();
            setFormat(match.capturedStart(), match.capturedLength(), format);
        }
    }
 
    // Constants
    {
        QTextCharFormat format;
        format.setFontWeight(QFont::Bold);
        format.setForeground(codeEditor->constantColor);
 
        QString integer("\\d+|0[xX]\\d+");
        QString floatingPoint("[-+]?[0-9]*\\.?[0-9]+([eE][-+]?[0-9]+)?");
        QRegularExpression expression("\\b(true|false|" + floatingPoint + "|" + integer + ")\\b");
        QRegularExpressionMatchIterator i = expression.globalMatch(text);
        while (i.hasNext())
        {
            QRegularExpressionMatch match = i.next();
            setFormat(match.capturedStart(), match.capturedLength(), format);
        }
    }
 
    // Preprocessor
    {
        QTextCharFormat format;
        format.setFontWeight(QFont::Bold);
        format.setForeground(codeEditor->preprocessorColor);
 
        QRegularExpression expression("^\\s*#.+|__LINE__|__FILE__|__VERSION__");
        QRegularExpressionMatchIterator i = expression.globalMatch(text);
        while (i.hasNext())
        {
            QRegularExpressionMatch match = i.next();
            setFormat(match.capturedStart(), match.capturedLength(), format);
        }
    }
 
    // Comments are last, so the style for commented parts of the line overrides any above styles.
 
    // C++-style Comments
    {
        QTextCharFormat format;
        format.setFontItalic(true);
        format.setForeground(codeEditor->commentColor);
 
        QRegularExpression expression("//.+");
        QRegularExpressionMatchIterator i = expression.globalMatch(text);
        while (i.hasNext())
        {
            QRegularExpressionMatch match = i.next();
            setFormat(match.capturedStart(), match.capturedLength(), format);
        }
    }
 
    // C-style Comments
    {
        QTextCharFormat format;
        format.setFontItalic(true);
        format.setForeground(codeEditor->commentColor);
 
        // From https://doc.qt.io/qt-5/qsyntaxhighlighter.html#details
 
        QRegularExpression startExpression("/\\*");
        QRegularExpression endExpression("\\*/");
 
        setCurrentBlockState(0);
 
        int startIndex = 0;
        if (previousBlockState() != 1)
            startIndex = text.indexOf(startExpression);
 
        while (startIndex >= 0)
        {
           QRegularExpressionMatch endMatch;
           int endIndex = text.indexOf(endExpression, startIndex, &endMatch);
           int commentLength;
           if (endIndex == -1)
           {
               setCurrentBlockState(1);
               commentLength = text.length() - startIndex;
           }
           else
               commentLength = endIndex - startIndex + endMatch.capturedLength();
 
           setFormat(startIndex, commentLength, format);
           startIndex = text.indexOf(startExpression, startIndex + commentLength);
        }
 
        // Don't highlight anything else in comment blocks.
        if (currentBlockState() == 1)
            return;
    }
}