1 | // Copyright Benoit Blanchon 2014-2016
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2 | // MIT License
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3 | //
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4 | // Arduino JSON library
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5 | // https://github.com/bblanchon/ArduinoJson
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6 | // If you like this project, please add a star!
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7 |
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8 | #pragma once
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9 |
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10 | #include "../Arduino/Print.hpp"
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11 | #include "Encoding.hpp"
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12 | #include "ForceInline.hpp"
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13 | #include "JsonFloat.hpp"
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14 | #include "JsonInteger.hpp"
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15 |
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16 | namespace ArduinoJson {
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17 | namespace Internals {
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18 |
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19 | // Writes the JSON tokens to a Print implementation
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20 | // This class is used by:
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21 | // - JsonArray::writeTo()
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22 | // - JsonObject::writeTo()
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23 | // - JsonVariant::writeTo()
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24 | // Its derived by PrettyJsonWriter that overrides some members to add
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25 | // indentation.
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26 | class JsonWriter {
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27 | public:
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28 | explicit JsonWriter(Print &sink) : _sink(sink), _length(0) {}
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29 |
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30 | // Returns the number of bytes sent to the Print implementation.
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31 | // This is very handy for implementations of printTo() that must return the
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32 | // number of bytes written.
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33 | size_t bytesWritten() const { return _length; }
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34 |
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35 | void beginArray() { write('['); }
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36 | void endArray() { write(']'); }
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37 |
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38 | void beginObject() { write('{'); }
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39 | void endObject() { write('}'); }
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40 |
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41 | void writeColon() { write(':'); }
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42 | void writeComma() { write(','); }
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43 |
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44 | void writeBoolean(bool value) { write(value ? "true" : "false"); }
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45 |
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46 | void writeString(const char *value) {
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47 | if (!value) {
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48 | write("null");
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49 | } else {
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50 | write('\"');
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51 | while (*value) writeChar(*value++);
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52 | write('\"');
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53 | }
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54 | }
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55 |
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56 | void writeChar(char c) {
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57 | char specialChar = Encoding::escapeChar(c);
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58 | if (specialChar) {
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59 | write('\\');
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60 | write(specialChar);
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61 | } else {
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62 | write(c);
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63 | }
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64 | }
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65 |
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66 | void writeInteger(JsonInteger value) { _length += _sink.print(value); }
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67 |
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68 | void writeFloat(JsonFloat value, uint8_t decimals) {
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69 | _length += _sink.print(value, decimals);
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70 | }
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71 |
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72 | void writeRaw(const char *s) { return write(s); }
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73 |
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74 | protected:
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75 | void write(char c) { _length += _sink.write(c); }
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76 | FORCE_INLINE void write(const char *s) { _length += _sink.print(s); }
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77 |
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78 | Print &_sink;
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79 | size_t _length;
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80 |
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81 | private:
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82 | JsonWriter &operator=(const JsonWriter &); // cannot be assigned
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83 | };
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84 | }
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85 | }
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