helpers.js

var operators = {};

var helpers = {
    operators: operators
};

operators.is = function() {
    var types = Array.prototype.slice.call(arguments);
    return types.indexOf(this.type) !== -1;
};

operators.is_dialogue = function() {
    return this.is("character", "parenthetical", "dialogue");
};

operators.name = function() {
    var character = this.text;
    var p = character.indexOf("(");
    if (p !== -1) {
        character = character.substring(0, p);
    }
    character = character.trim();
    return character;
};

operators.location = function() {
    var location = this.text.trim();
    location = location.replace(/^(INT\.?\/EXT\.?)|(I\/E)|(INT\.?)|(EXT\.?)/, "");
    var dash = location.lastIndexOf(" - ");
    if (dash !== -1) {
        location = location.substring(0, dash);
    }
    return location.trim();
};

operators.has_scene_time = function(time) {
    var suffix = this.text.substring(this.text.indexOf(" - "));
    return this.is("scene_heading") && suffix.indexOf(time) !== -1;
};

operators.location_type = function() {
    var location = this.text.trim();
    if (/^I(NT.?)?\/E(XT.?)?/.test(location)) {
        return "mixed";
    }
    else if (/^INT.?/.test(location)) {
        return "int";
    }
    else if (/^EXT.?/.test(location)) {
        return "ext";
    }
    return "other";
};

var enrich_token = function(token) {
    for (var name in operators) {
        token[name] = operators[name];
    }
    return token;
};

var create_token_delegator = function(line, name) {
    return function() {
        return line.token ? line.token[name].apply(line.token, arguments) : null;
    };
};

var create_fquery_delegator = function(name) {
    return function() {
        var args = arguments;
        return function(item) {
            return item[name].apply(item, args);
        };
    };
};

helpers.fq = {};
for (var name in operators) {
    helpers.fq[name] = create_fquery_delegator(name);
}

var enrich_line = function(line) {
    for (var name in operators) {
        line[name] = create_token_delegator(line, name);
    }
    return line;
};

helpers.first_text = function(type, list, default_value) {
    for (var i = 0; i < list.length; i++) {
        if (list[i].type === type) {
            return list[i].text;
        }
    }
    return default_value;
};

helpers.create_line = function(line) {
    line.text = line.text || "";
    line.type = line.type || "unknown";
    line.start = line.start || 0;
    line.end = line.end || 0;
    line.token = line.token || helpers.create_token({
        type: line.type
    });
    line.token.lines = line.token.lines || [line];
    return enrich_line(line);
};

helpers.create_token = function(token) {
    token.text = token.text || "";
    token.type = token.type || "unknown";
    token.start = token.start || 0;
    token.end = token.end || 0;
    token.lines = token.lines || [];
    return enrich_token(token);
};

helpers.create_separator = function(start, end) {
    return helpers.create_token({
        text: "",
        start: start,
        end: end,
        lines: [""],
        type: "separator"
    });
};

module.exports = helpers;