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libyaml-examples

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C language examples demonstrating how to use libyaml to emit and parse yaml formatted data

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# libyaml examples

This is a small set of c language example programs to demonstrate how to use
the [libyaml library](http://pyyaml.org/wiki/LibYAML).

## How to build

On Debian/Ubuntu, install the following packages.

$ sudo apt install gcc make libyaml-dev

Build the binaries with `make`.

$ make

## Emitter example

`emit.c` is a basic example to demonstrate how to convert raw c structs to a
yaml stream using the libyaml emitter API.  The example data to be converted is
a list of lists.

struct fruit {
        struct fruit *next;
        char *name;
        char *color;
        int count;
        struct variety *varieties;
    };
    struct variety {
        struct variety *next;
        char *name;
        char *color;
        bool seedless;
    };

These structs are populated with some example data and emitted as yaml:

$ ./emit
    ---
    fruit:
    - name: apple
      color: red
      count: 12
      varieties:
      - name: macintosh
        color: red
        seedless: false
      - name: granny smith
        color: green
        seedless: false
      - name: red delicious
        color: red
        seedless: false
    - name: orange
      color: orange
      count: 3
      varieties:
      - name: naval
        color: orange
        seedless: false
      - name: clementine
        color: orange
        seedless: true
      - name: valencia
        color: orange
        seedless: false
    - name: bannana
      color: yellow
      count: 4
      varieties:
      - name: cavendish
        color: yellow
        seedless: true
      - name: plantain
        color: green
        seedless: true
    - name: mango
      color: green
      count: 1
      varieties:
      - name: honey
        color: yellow
        seedless: false
    ...

## Parser example

`parser.c` is a basic example to demonstrate how to convert a specified yaml
grammar to c data structures using the libyaml emitter API.  The `parser`
program can read yaml generated by the `emit` program.

$ cat fruit.yaml
    ---
    fruit:
    - name: apple
      color: red
      count: 12
      varieties:
      - name: macintosh
        color: red
        seedless: false
      - name: granny smith
        color: green
        seedless: false
    - name: orange
      color: orange
      count: 3
      varieties:
      - name: naval
        color: orange
        seedless: false
      - name: clementine
        color: orange
        seedless: true
    ...

$ ./parse < fruit.yaml
    fruit: name=apple, color=red, count=12
      variety: name=macintosh, color=red, seedless=false
      variety: name=granny smith, color=green, seedless=false
    fruit: name=orange, color=orange, count=3
      variety: name=naval, color=orange, seedless=false
      variety: name=clementine, color=orange, seedless=true

## Scanner example

`scan.c` is a general purpose libyaml parser example which scans and prints the
libyaml parser events. This can be useful for debugging yaml parsers.

$ ./scan < fruit.yaml
    stream-start-event (1)
      document-start-event (3)
        mapping-start-event (9)
          scalar-event (6) = {value="fruit", length=5}
          sequence-start-event (7)
            mapping-start-event (9)
              scalar-event (6) = {value="name", length=4}
              scalar-event (6) = {value="apple", length=5}
              scalar-event (6) = {value="color", length=5}
              scalar-event (6) = {value="red", length=3}
              scalar-event (6) = {value="count", length=5}
              scalar-event (6) = {value="12", length=2}
              scalar-event (6) = {value="varieties", length=9}
              sequence-start-event (7)
                mapping-start-event (9)
                  scalar-event (6) = {value="name", length=4}
                  scalar-event (6) = {value="macintosh", length=9}
                  scalar-event (6) = {value="color", length=5}
                  scalar-event (6) = {value="red", length=3}
                  scalar-event (6) = {value="seedless", length=8}
                  scalar-event (6) = {value="false", length=5}
                mapping-end-event (10)
                mapping-start-event (9)
                  scalar-event (6) = {value="name", length=4}
                  scalar-event (6) = {value="granny smith", length=12}
                  scalar-event (6) = {value="color", length=5}
                  scalar-event (6) = {value="green", length=5}
                  scalar-event (6) = {value="seedless", length=8}
                  scalar-event (6) = {value="false", length=5}
                mapping-end-event (10)
              sequence-end-event (8)
            mapping-end-event (10)
            mapping-start-event (9)
              scalar-event (6) = {value="name", length=4}
              scalar-event (6) = {value="orange", length=6}
              scalar-event (6) = {value="color", length=5}
              scalar-event (6) = {value="orange", length=6}
              scalar-event (6) = {value="count", length=5}
              scalar-event (6) = {value="3", length=1}
              scalar-event (6) = {value="varieties", length=9}
              sequence-start-event (7)
                mapping-start-event (9)
                  scalar-event (6) = {value="name", length=4}
                  scalar-event (6) = {value="naval", length=5}
                  scalar-event (6) = {value="color", length=5}
                  scalar-event (6) = {value="orange", length=6}
                  scalar-event (6) = {value="seedless", length=8}
                  scalar-event (6) = {value="false", length=5}
                mapping-end-event (10)
                mapping-start-event (9)
                  scalar-event (6) = {value="name", length=4}
                  scalar-event (6) = {value="clementine", length=10}
                  scalar-event (6) = {value="color", length=5}
                  scalar-event (6) = {value="orange", length=6}
                  scalar-event (6) = {value="seedless", length=8}
                  scalar-event (6) = {value="true", length=4}
                mapping-end-event (10)
              sequence-end-event (8)
            mapping-end-event (10)
            mapping-start-event (9)
              scalar-event (6) = {value="name", length=4}
              scalar-event (6) = {value="bannana", length=7}
              scalar-event (6) = {value="color", length=5}
              scalar-event (6) = {value="yellow", length=6}
              scalar-event (6) = {value="count", length=5}
              scalar-event (6) = {value="4", length=1}
            mapping-end-event (10)
            mapping-start-event (9)
              scalar-event (6) = {value="name", length=4}
              scalar-event (6) = {value="mango", length=5}
              scalar-event (6) = {value="color", length=5}
              scalar-event (6) = {value="green", length=5}
              scalar-event (6) = {value="count", length=5}
              scalar-event (6) = {value="1", length=1}
            mapping-end-event (10)
          sequence-end-event (8)
        mapping-end-event (10)
      document-end-event (4)
    stream-end-event (2)

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