https://github.com/meffie/libyaml-examples

C language examples demonstrating how to use libyaml to emit and parse yaml formatted data
https://github.com/meffie/libyaml-examples

libyaml yaml

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

• Host: GitHub
• URL: https://github.com/meffie/libyaml-examples
• Owner: meffie
• License: unlicense
• Created: 2019-04-10T16:28:39.000Z (over 5 years ago)
• Default Branch: master
• Last Pushed: 2022-12-01T20:14:36.000Z (about 2 years ago)
• Last Synced: 2023-03-27T12:46:24.950Z (almost 2 years ago)
• Topics: libyaml, yaml
• Language: C
• Homepage:
• Size: 23.4 KB
• Stars: 23
• Watchers: 2
• Forks: 9
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# 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)