snippetextractor/Process.cpp at master · endocode/snippetextractor · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
#include <QString>
#include <QRegularExpression>
#include <QFile>
#include <QTextStream>

#include "Helpers.h"
#include "Process.h"
#include "Exception.h"

void process( const QString inputfilename, const QString outputfilename) {
    const QString result = process(inputfilename);
    QFile outputfile(outputfilename);
    if (!outputfile.open(QIODevice::WriteOnly)) {
        throw Exception(u("Unable to open output file \"%1\" for writing!").arg(outputfilename));
    }
    QTextStream stream(&outputfile);
    stream << result;
}

QString process(const QString inputfilename)
{
    QFile inputfile(inputfilename);
    if (!inputfile.open(QIODevice::ReadOnly)) {
        throw Exception(u("Unable to open input file \"%1\" for reading!").arg(inputfilename));
    }

    QString result;
    QTextStream stream(&inputfile);
    int linecounter = 0;
    while (!stream.atEnd()) {
        ++linecounter;
        const QString positionInFile = u("%1:%2").arg(inputfilename).arg(linecounter);
        auto line = stream.readLine();
        const int index = line.indexOf(u("@@snippet("));
        if ( index != -1) {
            const int openingBracket = line.indexOf(u("("), index);
            Q_ASSERT(openingBracket  != 0); // we just searched for it above
            int position = openingBracket;
            int brackets = 1;
            while (brackets != 0) {
                position += 1;
                if (position == line.count()) {
                    throw Exception(u("%1: Syntax error, opening and closing brackets do not match!")
                                    .arg(positionInFile));
                }
                auto const character = line.at(position);
                if (character == QChar::fromLatin1('(')) {
                    brackets += 1;
                } else if (character == QChar::fromLatin1(')')) {
                    brackets -= 1;
                }
            }
            const QString command = line.mid(index, openingBracket - index);
            const QString arguments = line.mid(openingBracket + 1, position - openingBracket - 1);
            if (command == u("@@snippet")) {
                result += process_snippet(arguments, positionInFile);
            } else {
                throw Exception(u("%1: Unknown parser instruction \"%1\" at line %2!").arg(positionInFile).arg(command));
            }
        } else {
            result.append(line + u("\n"));
        }
    }

    return result;
}

QString process_snippet(const QString argumentString, const QString& position)
{
    const QStringList arguments = argumentString.split(u(","));
    if (arguments.count() != 3) {
        throw Exception(u("%1: Argument error!").arg(position));
    }
    const QString filename = arguments[0].trimmed();
    const QString snippet = arguments[1].trimmed();
    const QString style = arguments[2].trimmed();

    QFile sourceFile(filename);
    if (!sourceFile.open(QIODevice::ReadOnly)) {
        throw Exception(u("%1: Error opening file \"%2\" for reading!").arg(position).arg(filename));
    }
    QTextStream stream(&sourceFile);
    int linecounter = 0;
    bool found = false;
    bool reading = false;
    bool complete = false;
    QString result;
    while (!stream.atEnd()) {
        ++linecounter;
        const QString positionInFile = u("%1:%2").arg(filename).arg(linecounter);
        auto line = stream.readLine();
        if (reading) {
            const QRegularExpression snipped_end(u("(\\/\\/|\\#\\#)\\@\\@snippet_end"));
            const int index = line.indexOf(snipped_end);
            if (index == -1) {
                result.append(line + u("\n"));
            } else {
                reading = false;
                result += u("~~~\n");
                complete = true;
                break;
            }
        } else {
            const QRegularExpression snippet_begin(u("(\\/\\/|\\#\\#)\\@\\@snippet_begin\\("));
            const int index = line.indexOf(snippet_begin);
            if (index != -1) {
                const int openingBracket = line.indexOf(u("("), index);
                Q_ASSERT(openingBracket  != 0); // we just searched for it above
                int position = openingBracket;
                int brackets = 1;
                while (brackets != 0) {
                    position += 1;
                    if (position == line.count()) {
                        throw Exception(u("%1: Syntax error, opening and closing brackets do not match!")
                                        .arg(positionInFile));
                    }
                    auto character = line.at(position);
                    if (character == u("(")) {
                        brackets += 1;
                    } else if (character == u(")")) {
                        brackets -= 1;
                    }
                }
                const QString name = line.mid(openingBracket + 1, position - openingBracket - 1);
                if (name == snippet) {
                    reading = true;
                    found = true;
                    const QString opener = u("~~~ {#%1 .%2 .numberLines startFrom=\"%3\"}\n")
                            .arg(snippet)
                            .arg(style)
                            .arg(linecounter + 1);
                    result += opener;
                }
            }
        }
    }
    if (!found) {
        throw Exception(u("%1: Snippet \"%2\" not found!").arg(filename).arg(snippet));
    }
    if (!complete) {
        throw Exception(u("%1: End tag not found for snippet \"%2\"!").arg(filename).arg(snippet));
    }
    return result;
}